JP7003192B1 - Organic sludge treatment equipment and treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic sludge treatment facility and a treatment method capable of sufficiently reducing the water content of organic sludge by heating in a concentrating means without lowering the fluidity and heating efficiency of the organic sludge. do. SOLUTION: The organic sludge treatment equipment and treatment method of the present invention include a concentration means 2 for concentrating organic sludge C (aggregated sludge C) to which a polymer flocculant B is added and aggregated. In the treatment equipment and treatment method, the concentrating means 2 includes a transporting means for transporting organic sludge, a concentrating unit 2B for concentrating the concentration of organic sludge to 6 wt% or more and 12 wt% or less, and a concentrated hot water supply means. Concentrated hot water F having a temperature higher than 50 ° C. and lower than 100 ° C. is supplied to the organic sludge and mixed with the organic sludge to heat the organic sludge, and further heated with the hot water supply unit 2C in which the organic sludge is diluted. , And a reconcentration unit 2D in which the concentration of the diluted organic sludge is reconcentrated to 6 wt% or more and 12 wt% or less. [Selection diagram] Fig. 2

Description

The present invention provides, for example, an organic sludge treatment facility provided with a concentrating means for concentrating organic sludge aggregated by adding a flocculant to sewage sludge generated from a sewage treatment plant, and such organic sludge. It relates to a method for treating organic sludge, which is concentrated by a concentrating means.

As such organic sludge treatment equipment, for example, Patent Document 1 describes a concentrating means for concentrating the treated sludge connected to the treated sludge supply channel and dehydrating the concentrated sludge concentrated by the concentrating means. A dehydration means, a concentrated sludge supply path connecting the concentration means and the dehydration means, and a dehydration drain tank for holding the dehydrated wastewater dehydrated from the concentrated sludge by the dehydration means are provided, and an electrolyte is supplied to the dehydration drain tank. It is described that the dehydrated drainage circulation supply path connected to the dehydrated drainage circulation supply path for supplying the dehydrated wastewater held in the dehydration drainage tank to the concentrated sludge supply path and circulating it to the dehydration means is described.

Then, in this Patent Document 1, the washing water supply means is connected to the concentrating means, and the washing water is supplied from the washing water supply means to the treated sludge being concentrated by the concentrating means. It is described that the supply amount of the washing water supplied to the concentrating means is equal to or less than the amount of the treated sludge supplied to the concentrating means in terms of volume, and the washing water is about 50 ° C. It is stated that it is desirable to use warm water from.

Japanese Unexamined Patent Publication No. 2017-170346

As described above, it is desirable to use warm water as the washing water because the organic sludge to which the flocculant is added is heated by the hot water in the concentrating means, the proteins in the organic sludge are heat-denatured, and the water is retained. This is because when the protein is separated, it is discharged as wastewater together with the washing water. Therefore, the dehydration efficiency in the dehydration means can be further improved.

However, in the treatment equipment and the treatment method described in Patent Document 1, the desirable temperature of the washing water is about 50 ° C., and such washing water is used as organic sludge at, for example, 25 ° C., and the amount of sludge supplied as described above. Even if an equal amount of washing water is supplied, the organic sludge can be heated only to about 38 ° C. Therefore, it may not be possible to reliably improve the dehydration efficiency in the dehydration means.

In addition, when hot water is added to the sludge to heat it, if the sludge is filtered and concentrated, the water content of the sludge decreases, the sludge concentration increases, and the volume of the sludge is reduced. The amount of heat can be reduced.

However, in the case of the method in which hot water is directly added to the sludge to heat it, if the sludge concentration becomes too high, the viscosity of the sludge increases and the fluidity is impaired. Efficiency may be reduced.

The present invention has been made under such a background, and the water content of the organic sludge is sufficiently lowered by heating the organic sludge in the concentrating means, and the fluidity and the heating efficiency of the organic sludge are lowered. It is an object of the present invention to provide a treatment facility and a treatment method for organic sludge that can be achieved without any problems.

In order to solve the above problems and achieve such an object, the organic sludge treatment facility of the present invention is provided with a concentration means for concentrating the organic sludge containing the aggregated protein by adding a flocculant. An organic sludge treatment facility provided, wherein the concentrating means is a transporting means for transporting the organic sludge supplied from one end side of the concentrating means from the one end side to the other end side of the concentrating means. The concentration section provided on one end side of the concentration means for concentrating the organic sludge so that the concentration of the organic sludge is in the range of 6 wt% or more and 12 wt% or less, and the concentration hot water supply means at a temperature higher than 50 ° C. Concentrated hot water at a high temperature in the temperature range of less than 100 ° C. is supplied to the organic sludge located on the other end side of the concentrating means from the concentrating part and mixed with the organic sludge to mix the organic sludge. The hot water supply unit provided on the other end side of the concentrating means with respect to the concentrating unit, and the heated and diluted organic sludge have a concentration of 6 wt%. It is characterized by including a reconcentration unit provided on the other end side of the concentrating means with respect to the hot water supply unit, which is reconcentrated to 12 wt% or less.

Further, the method for treating organic sludge of the present invention is a method for treating organic sludge in which an organic sludge containing an aggregated protein to which a flocculant is added is concentrated by a concentrating means, and the above-mentioned concentrating means is used. After concentrating the organic sludge so that the concentration is in the range of 6 wt% or more and 12 wt% or less, the concentrated hot water having a temperature higher than 50 ° C. and a temperature of less than 100 ° C. is concentrated into the organic sludge after concentration. It is supplied and mixed with the organic sludge, the organic sludge is heated, the organic sludge is further diluted, and the concentration of the heated and diluted organic sludge is 6 wt% or more and 12 wt by the concentration means. It is characterized by reconcentration to% or less.

In the organic sludge treatment equipment and treatment method configured as described above, the concentration of the organic sludge is concentrated in the range of 6 wt% or more and 12 wt% or less by the concentration means for concentrating the organic sludge containing protein. After that, concentrated hot water having a temperature higher than 50 ° C. and a temperature of less than 100 ° C. is supplied from the concentrated hot water supply means to the concentrated organic sludge, mixed with the organic sludge, and heated. Further, the organic sludge is diluted, heated, and the concentration of the diluted organic sludge is reconcentrated to 6 wt% or more and 12 wt% or less, so that the heating efficiency is not impaired due to a decrease in the fluidity of the organic sludge. By increasing the sludge concentration of the organic sludge, the protein in the organic sludge can be reliably heat-modified with a small amount of heating heat to separate and discharge the retained water. By concentrating the organic sludge to the above concentration range, the required heating heat amount of the organic sludge can be reduced, and since the sludge is diluted by adding warm water, the fluidity is further increased and strong stirring is performed. It is possible to heat the organic sludge uniformly and without breaking the agglomerated state by spreading hot water all over the sludge. Further, the concentration of the heated and diluted organic sludge can be reconcentrated to 6 wt% or more and 12 wt% or less. Therefore, initially, after concentrating the concentration of organic sludge to 6 wt% or more and 12 wt% or less by a concentrating means, the sludge is heated by direct pouring of warm water, but the sludge is diluted. Efficient dehydration is possible in the dehydration means. As described above, the organic sludge can be concentrated to the optimum concentration in the concentration means, and the dehydration efficiency can be improved when the dehydration means is provided in the subsequent stage.

Here, as a result of various studies by the inventor of the present invention, especially when the organic sludge containing protein is mixed raw sludge, the water content of the organic sludge is increased every time the sludge temperature is increased by 10 ° C. as described later. We were able to obtain the finding that can be reduced by about 1%. Therefore, the higher the temperature of the concentrated hot water, that is, the higher the sludge temperature, the lower the water content of the concentrated organic sludge. Further, by heating the organic sludge, the viscosity of the organic sludge is lowered, so that the dehydration efficiency when dehydrating the concentrated organic sludge is also improved.

Further, in the concentration means as described above, by mixing the concentrated hot water with the organic sludge containing the protein, the aggregation inhibitor contained in the liquid of the organic sludge can be replaced with the concentrated hot water, so that the concentrated hot water can be used for concentration. It is possible to prevent the flocculant such as polyferrous sulfate (PFS) added to the organic sludge from being consumed by the aggregation inhibitor, and efficiently to the solid content of the organic sludge enriched with the flocculant. The reaction can be carried out, and the amount of the flocculant added can be reduced.

When the temperature of the concentrated hot water is 50 ° C. or lower, the effects of lowering the viscosity of the organic sludge containing the above-mentioned protein and separating water cannot be sufficiently obtained. Further, if the temperature of the concentrated hot water exceeds 100 ° C., it becomes difficult to handle. As described above, the higher the temperature of the concentrated hot water, the more the viscosity of the organic sludge decreases and the separation of water due to the thermal denaturation of the protein is promoted. For example, the hot water used in the treatment facility is used as the concentrated hot water. In some cases, a temperature range of 60 ° C. or higher and 90 ° C. or lower is realistic and desirable.

When dehydrating the concentrated organic sludge, it is desirable to add a flocculant to the organic sludge concentrated by the above-mentioned concentrating means.

Here, as the concentrating means, first, the concentrated filtration screen in which the organic sludge is supplied from one end side, the filtrate chamber provided on the outer periphery of the concentrated filtration screen, the concentrated filtration screen, and the above. A concentration tank including a filtration chamber and having a central axis extending in the vertical direction from one end side to the other end side of the concentration filtration screen, and a concentration tank provided on the one end side of the concentration filtration screen, where water is removed by the concentration filtration screen. A screw is attached to a concentrating section where the organic sludge is separated and concentrated, and a rotating shaft along the central axis of the concentrating tank, and the rotating shaft and the screw are rotated by a rotation driving means to rotate the organic sludge. The transport means for transporting the sex sludge from the one end side to the other end side of the concentrated filtration screen and the rotary shaft of the transport means have a hollow cylindrical shape, and a plurality of cylindrical walls of the rotary shaft are formed. The hot water supply port is formed, and the concentrated hot water is supplied to the hollow portion in the rotating shaft and ejected from the hot water supply port, so that the other end of the concentrated hot water is larger than the concentrated portion in the concentrated filtration screen. Provided on the other end side of the concentrated portion of the concentrated filtration screen, which is supplied to the concentrated sludge located on the side, mixed with the concentrated sludge, heated the concentrated sludge, and further diluted the concentrated sludge. It is provided with a hot water supply unit to be heated and a reconcentration unit provided on the other end side of the hot water supply unit in the concentrated filtration screen for reconcentrating the heated and diluted concentrated sludge by the concentrated filtration screen. A vertical filtration concentrator can be used.

When such a vertical filtration concentrator is used, the rotation axis of the transfer means is formed into a hollow cylindrical shape, and a plurality of hot water supply ports are formed on the cylindrical wall portion of the rotation axis. By supplying the concentrated hot water to the hollow portion in the rotation shaft and ejecting it from the hot water supply port, the concentrated hot water is concentrated in the concentrated portion and is located on the other end side of the concentrated portion in the concentrated filtration screen. The organic sludge (concentrated sludge) can be mixed by supplying the concentrated hot water at the hot water supply unit provided on the other end side of the concentrated unit in the concentrated filtration screen. By mixing the concentrated hot water with the concentrated sludge, the concentrated sludge can be heated and the protein in the concentrated sludge can be reliably heat-denatured to separate the retained water. In addition, the concentrated sludge diluted in this process can be reconcentrated in the reconcentration section. Here, usually, when sludge is concentrated, hot water is supplied to the concentrated sludge, and further, when the concentrated sludge is reconcentrated, two concentrators are installed in series and hot water is placed between the two concentrators. It is necessary to take a means of supplying, but by providing the concentrating means with three zones of a concentrating part, a hot water supply (heating) part, and a reconcentrating part, one concentrating means can be used for concentration, hot water supply (heating), and re-concentration. Concentration can be done.

Secondly, as the concentrating means, the water is separated by the concentrated filtration screen in which the organic sludge is supplied from one end side and the concentrated filtration screen provided on the one end side of the concentrated filtration screen. A filtrate chamber provided on the outer periphery of the concentrated filtration screen and having a central axis extending laterally from one end side to the other end side of the concentrated filtration screen, and a filtrate chamber thereof. A screw is attached to the rotary shaft along the central axis of the chamber, and the rotary drive means rotates the rotary shaft and the screw to transfer the organic sludge from the one end side to the other end side of the concentrated filtration screen. The transporting means for transporting and the rotating shaft of the transporting means have a hollow cylindrical shape, and a plurality of hot water supply ports are formed on the cylindrical wall portion of the rotating shaft. By being supplied to the hollow portion in the shaft and ejected from the hot water supply port, it is supplied to the concentrated sludge located on the other end side of the concentrated portion in the concentrated filtration screen and mixed with the concentrated sludge. The hot water supply unit provided on the other end side of the concentrated section of the concentrated filtration screen for heating the concentrated sludge and further diluting the concentrated sludge, and the heated and diluted concentrated sludge are concentrated and filtered. It is also possible to use a screw type concentrator provided with a reconcentration unit provided on the other end side of the hot water supply unit in the concentration filtration screen for reconcentration by a screen.

When such a screw type concentrator is used as a concentrating means, the rotating shaft of the transporting means has a hollow cylindrical shape, and a plurality of hot water supply ports are formed on the cylindrical wall portion of the rotating shaft. By supplying the concentrated hot water to the hollow portion in the rotation axis and ejecting the concentrated hot water from the hot water supply portion, the concentrated sludge located on the other end side of the concentrated portion in the concentrated filtration screen is covered with the concentrated sludge. The concentrated hot water is supplied by the hot water supply unit provided on the other end side of the concentrated unit in the concentrated filtration screen. By doing so, the organic sludge (concentrated sludge) concentrated in the concentrating portion and the concentrated hot water can be mixed by the rotation of the screw by the rotation driving means. By mixing the concentrated hot water with the concentrated sludge, the concentrated sludge can be heated and the protein in the concentrated sludge can be reliably heat-denatured to separate the retained water. In addition, the concentrated sludge diluted in this process can be reconcentrated in the reconcentration section. Here, usually, when sludge is concentrated, hot water is supplied to the concentrated sludge, and further, when the concentrated sludge is reconcentrated, two concentrators are installed in series and hot water is placed between the two concentrators. It is necessary to take a means of supplying, but by providing the concentrating means with three zones of a concentrating part, a hot water supply (heating) part, and a reconcentrating part, one concentrating means can be used for concentration, hot water supply (heating), and re-concentration. Concentration can be done.

Further, as the concentration means, thirdly, an endless concentrated filtration filter cloth wound around a plurality of rolls so as to be able to run is provided, and the concentrated filtration filter cloth is horizontally formed from one end side to the other end. The transport means for transporting the organic sludge supplied to the one end side of the concentrated filtration unit traveling to the side from the one end side of the concentrated filtration unit to the other end side, and the one end side of the concentrated filtration unit. The concentrated section is provided, and the concentrated hot water is separated from the water by the concentrated filtered filter cloth to concentrate the organic sludge, and the concentrated hot water from the concentrated hot water supply means is more concentrated than the concentrated section in the concentrated filter section. The other end side of the concentrated filtration section in the concentrated filtration section, which is supplied to the concentrated sludge located on the other end side of the above, mixes with the concentrated sludge, heats the concentrated sludge, and further dilutes the concentrated sludge. A hot water supply unit provided in the above, and a reconcentration unit provided on the other end side of the hot water supply unit in the concentrated filtration unit for reconcentrating the heated and diluted concentrated sludge with the concentrated filtration filter cloth. A belt type concentrator equipped with, can be used.

When such a belt-type concentrator is used, the concentrated hot water is supplied from the concentrated hot water supply means to the concentrated sludge located on the other end side of the concentrated section in the concentrated filtration section. By supplying the concentrated hot water from the hot water supply unit provided on the other end side of the concentration unit, the concentrated hot water is concentrated by the concentration unit on the concentrated filtration filter cloth running on the horizontal sludge filtration unit. Can be mixed with (concentrated sludge). By mixing the concentrated hot water with the concentrated sludge, the concentrated sludge can be heated, and the protein in the concentrated sludge can be reliably heat-denatured to separate the retained water. In addition, the concentrated sludge diluted in this process can be reconcentrated in the reconcentration section. Here, usually, when sludge is concentrated, hot water is supplied to the concentrated sludge, and further, when the concentrated sludge is reconcentrated, two concentrators are installed in series and hot water is placed between the two concentrators. It is necessary to take a means of supplying, but by providing the concentrating means with three zones of a concentrating part, a hot water supply (heating) part, and a reconcentrating part, one concentrating means can be used for concentration, hot water supply (heating), and re-concentration. Concentration can be done.

Further, as the concentrating means, fourthly, a plurality of fixed plates arranged at intervals from each other and a plurality of movable plates arranged between the plurality of adjacent fixed plates and performing eccentric rotational movement are provided. A filter body having a filter body, a casing having a central axis for accommodating the filter body and the organic sludge and extending from one end side to the other end side, and a side surface of the casing on the one end side are supplied to the outside of the filter body. The organic sludge transported by the transport means is concentrated by the gap between the transport means for transporting the organic sludge toward the other end side of the casing and the plurality of fixed plates and the plurality of movable plates. The concentrated hot water is supplied from the concentrated hot water supply means to the outside of the filter from the concentrated portion provided on the one end side of the casing and the central side surface of the casing, and the concentrated hot water is more than the concentrated portion in the casing. The hot water supply unit provided on the other end side of the casing, which is mixed with the concentrated sludge located on the other end side, heats the concentrated sludge, and further dilutes the concentrated sludge. A multiple disk type concentrator including the reconcentrated section provided on the other end side of the hot water supply section in the casing for reconcentrating the diluted concentrated sludge with the filter can be used.

When such a multiple disk type concentrator is used, the concentrated hot water is supplied from the central side surface of the casing to the outside of the filter from the concentrated hot water supply means, and the concentrated hot water is more than the concentrated portion in the casing. The concentrated hot water can be mixed with the concentrated sludge located on the other end side. By mixing the concentrated hot water with the concentrated sludge, the concentrated sludge can be heated, and the protein in the concentrated sludge can be reliably heat-denatured to separate the retained water. In addition, the concentrated sludge diluted in this process can be reconcentrated in the reconcentration section. Normally, when sludge is concentrated, hot water is supplied to the concentrated sludge, and further, when the concentrated sludge is reconcentrated, two concentrators are installed in series and hot water is supplied between the two concentrators. However, by providing the concentrating means with three zones, a concentrating section, a hot water supply (heating) section, and a reconcentration section, one concentrating means can be used for concentration, hot water supply (heating), and reconcentration. be able to.

Further, as the concentrating means, fifthly, the water is separated by the concentrated filtration screen in which the organic sludge is supplied from one end side and the concentrated filtration screen provided on the one end side of the concentrated filtration screen. Including the concentration section where the organic sludge is concentrated, the filtration chamber provided on the outer periphery of the concentration filtration screen, the concentration filtration screen and the filtration chamber, and the concentration filtration screen from one end side in the lateral direction. The concentrated filtration screen has a casing having a central axis extending toward the end side, and a spiral guide for transporting sludge on the inner peripheral surface of the concentrated filtration screen. The concentrated hot water is supplied from the transport means for transporting from the one end side to the other end side and the concentrated hot water supply means, and the concentrated sludge located on the other end side of the concentrated portion in the concentrated filtration screen. The concentrated sludge is heated and diluted with a hot water supply unit provided on the other end side of the concentrated unit in the concentrated filtration screen, and the concentrated sludge is heated and diluted. A rotary drum type concentrator can be used, which comprises a reconcentration unit provided on the other end side of the hot water supply unit in the concentration filtration screen, which reconcentrates the water with the concentration filtration screen.

When such a rotary drum type concentrator is used, the concentrated hot water is supplied from the concentrated hot water supply means at the hot water supply unit provided on the other end side of the concentrating unit in the concentrated filtration screen, and the concentrated hot water is supplied. The concentrated hot water can be mixed with the concentrated sludge located on the other end side of the concentrated portion in the concentrated filtration screen. By mixing the concentrated hot water with the concentrated sludge, the concentrated sludge can be heated, and the protein in the concentrated sludge can be reliably heat-denatured to separate the retained water. In addition, the concentrated sludge diluted in this process can be reconcentrated in the reconcentration section. Normally, when sludge is concentrated, hot water is supplied to the concentrated sludge, and further, when the concentrated sludge is reconcentrated, two concentrators are installed in series and hot water is supplied between the two concentrators. However, by providing the concentrating means with three zones, a concentrating section, a hot water supply (heating) section, and a reconcentration section, one concentrating means can be used for concentration, hot water supply (heating), and reconcentration. be able to.

Further, as the concentrating means, a sixth is a housing provided with a plurality of fixing plates arranged at intervals from each other and a plurality of elliptical rotating plates arranged between the plurality of fixing plates. The organic sludge is supplied from one end side of the housing, and the organic sludge is concentrated by the gap between the plurality of fixing plates and the plurality of elliptical rotating plates. The concentrated hot water is supplied from the concentrating unit, the transporting means for transporting the concentrated sludge from the one end side to the other end side of the housing by rotating the plurality of elliptical rotating plates, and the concentrated hot water supply means. The concentrated sludge is mixed with the concentrated sludge located on the other end side of the concentrated portion in the housing, the concentrated sludge is heated, and the concentrated sludge is further diluted. From the hot water supply unit provided on the other end side and the hot water supply unit in the housing that reconcentrates the heated and diluted concentrated sludge by the plurality of fixed plates and the plurality of elliptical rotating plates. Also, an elliptical plate type concentrator provided with the reconcentrator provided on the other end side can be used.

When such an elliptical plate type concentrator is used, the concentrated hot water is supplied from the concentrated hot water supply means at the hot water supply unit provided on the other end side of the concentrating unit in the housing, and the concentrated hot water is supplied. The concentrated hot water can be mixed with the concentrated sludge located on the other end side of the concentrated portion in the housing. By mixing the concentrated hot water with the concentrated sludge, the concentrated sludge can be heated, and the protein in the concentrated sludge can be reliably heat-denatured to separate the retained water. In addition, the concentrated sludge diluted in this process can be reconcentrated in the reconcentration section. Normally, when sludge is concentrated, hot water is supplied to the concentrated sludge, and further, when the concentrated sludge is reconcentrated, two concentrators are installed in series and hot water is supplied between the two concentrators. However, by providing the concentrating means with three zones, a concentrating section, a hot water supply (heating) section, and a reconcentration section, one concentrating means can be used for concentration, hot water supply (heating), and reconcentration. be able to.

Further, as the concentrating means, seventh, a screw conveyor that is rotationally driven coaxially with the rotary bowl at a differential speed is provided inside the rotary bowl that is rotationally driven around the axis, and these rotary bowls and the screw conveyor are provided. The concentrator provided on the one end side of the screw conveyor for solid-liquid separation and concentration of sludge supplied from one end side in the axial direction by the centrifugal force of the rotary bowl and the screw conveyor are rotationally driven. The concentrated sludge is communicated between the transport means for transporting the concentrated sludge from the one end side of the screw conveyor to the other end side in the axial direction and the hot water supply pipe inserted from the one end side of the screw shaft of the screw conveyor. The concentrated hot water from the concentrated hot water supply means is supplied through the hot water supply pipe and mixed with the concentrated sludge located on the other end side of the concentrated portion of the screw conveyor to heat the concentrated sludge. Further, a hot water supply unit provided on the outer peripheral portion of the screw shaft so as to extend to the other end side of the concentrated part for further diluting the concentrated sludge, and the heated and diluted concentrated sludge are applied to the rotating bowl. A centrifuge having a reconcentration section provided on the other end side of the hot water supply section of the screw conveyor, which separates solid and liquid by centrifugal force and concentrates again, can be used.

When such a centrifuge is used, the concentrated hot water from the concentrated hot water supply means is supplied through the hot water supply pipe, and the concentrated hot water is located on the other end side of the concentrated portion of the screw conveyor. The above-mentioned concentrated hot water can be mixed with the concentrated sludge. By mixing the concentrated hot water with the concentrated sludge, the concentrated sludge can be heated, and the protein in the concentrated sludge can be reliably heat-denatured to separate the retained water. In addition, the concentrated sludge diluted in this process can be reconcentrated in the reconcentration section. Normally, when sludge is concentrated, hot water is supplied to the concentrated sludge, and further, when the concentrated sludge is reconcentrated, two concentrators are installed in series and hot water is supplied between the two concentrators. However, by providing the concentrating means with three zones, a concentrating section, a hot water supply (heating) section, and a reconcentration section, one concentrating means can be used for concentration, hot water supply (heating), and reconcentration. be able to.

As described above, according to the present invention, in the concentrating means, the organic sludge is heated by supplying concentrated hot water to the organic sludge concentrated to the optimum sludge concentration and mixing the organic sludge, so that the organic sludge is contained in the organic sludge. The protein is reliably heat-modified to separate water, and the diluted concentrated sludge can be reconcentrated to the optimum sludge concentration by supplying concentrated hot water, so that the organic sludge contains sufficiently low water content. While concentrating to a high concentration at a rate, it becomes possible to efficiently dehydrate in the dewatering means after the concentrating means.

It is a schematic diagram which shows the 1st Embodiment of the organic sludge treatment equipment of this invention. It is a detailed view of the Embodiment shown in FIG. It is a figure of the 1st example which shows the relationship between the temperature of the concentrated hot water and the water content of organic sludge (concentrated sludge) according to the embodiment shown in FIGS. 1 and 2. It is a figure which shows the relationship between the temperature and the water content of the organic sludge (concentrated sludge) heated by the concentrated hot water of 1st example shown in FIG. It is a figure of the 2nd example which shows the relationship between the temperature of the concentrated hot water and the water content of organic sludge (concentrated sludge) according to the embodiment shown in FIGS. 1 and 2. It is a figure which shows the relationship between the temperature and the water content of the organic sludge (concentrated sludge) heated by the concentrated hot water of the 2nd example shown in FIG. FIG. 3 is a diagram of a third example showing the relationship between the temperature of concentrated hot water and the water content of organic sludge (concentrated sludge) according to the embodiments shown in FIGS. 1 and 2. It is a figure which shows the relationship between the temperature and the water content of the organic sludge (concentrated sludge) heated by the concentrated hot water of the 3rd example shown in FIG. 7. It is a figure which shows the relationship between the concentrated sludge concentration and the concentrated sludge temperature. It is a figure which shows the 1st modification of the enrichment means and the dehydration means of 1st Embodiment shown in FIG. 1 and FIG. It is a figure which shows the 2nd modification of the enrichment means and the dehydration means of 1st Embodiment shown in FIG. 1 and FIG. It is a figure which shows the 3rd modification of the enrichment means and the dehydration means of 1st Embodiment shown in FIG. 1 and FIG. It is a figure which shows the 4th modification of the enrichment means and the dehydration means of 1st Embodiment shown in FIG. 1 and FIG. It is a figure which shows the 5th modification of the enrichment means and the dehydration means of 1st Embodiment shown in FIG. 1 and FIG. It is a figure which shows the 6th modification of the enrichment means and the dehydration means of 1st Embodiment shown in FIG. 1 and FIG. It is a schematic diagram which shows the 2nd Embodiment of the organic sludge treatment equipment of this invention.

1 and 2 show the first embodiment of the organic sludge treatment equipment of the present invention, and the present invention while explaining the first embodiment of the organic sludge treatment equipment below. The method of treating organic sludge is also described. In the organic sludge treatment facility of the present embodiment, the polymer flocculant B is added to the organic sludge A containing a protein such as sewage sludge such as mixed raw sludge generated and supplied from a sewage treatment plant. Aggregation means 1 that aggregates to some extent, concentration means 2 that concentrates aggregated sludge C whose solid content has aggregated to some extent by the aggregation means 1, dehydration means 3 that dehydrates the concentrated sludge D concentrated by the concentration means 2, and these. It is provided with a concentrated sludge supply path 4 that connects the concentrating means 2 and the dewatering means 3.

As shown in FIG. 2, the coagulation means 1 includes a bottomed cylindrical coagulation tank 1A having a central axis extending in the vertical direction in which the organic sludge A and the polymer coagulant B are supplied from the bottom and held. There is. In this coagulation tank 1A, a stirring blade 1b is attached to a rotary shaft 1a along the central axis of the coagulation tank 1A, and the rotary shaft 1a and stirring are performed by a rotary drive means 1c such as a motor provided on the upper part of the coagulation tank 1A. A stirring means 1B is provided for stirring and mixing the organic sludge A and the polymer flocculant B by rotating the blade 1b. The aggregated sludge C that has been agitated, mixed and aggregated with the polymer flocculant B by the stirring means 1B is extracted from the upper part of the coagulation tank 1A and supplied to the concentrating means 2. Here, a pump (not shown) may be provided between the aggregating means 1 and the concentrating means 2 to extract the agglomerated sludge C from the upper part of the aggregating tank 1A and convey it to the concentrating means 2. In the following description, the aggregated sludge C may be referred to as organic sludge C.

The concentrating means 2 in the present embodiment is a vertical filtration concentrator, and is from one end side to the other end side similar to the coagulation tank 1A in which the coagulation sludge C supplied from one end side (upper part) of the coagulation means 1 is held. A bottomed cylindrical concentration tank 2A having a central axis extending in the vertical direction is provided, and the aggregated sludge C is supplied into the concentration tank 2A from the upper part (one end side) of the concentration tank 2A. However, the body of the concentration tank 2A is a concentration filtration screen 2a formed of a wedge wire, punching metal, or the like, and the outer periphery of the concentration filtration screen 2a is a filtrate chamber 2b.

Further, in the concentrating tank 2A, a screw 2d is attached to a rotating shaft 2c along the central axis of the concentrating tank 2A, and the rotating shaft 2c and the rotating shaft 2c are provided by a rotary driving means 2e such as a motor provided on the upper part of the concentrating tank 2A. A transport means 2E for transporting the aggregated sludge C from one end side to the other end side by rotating the screw 2d is provided. The coagulated sludge C supplied from the upper part of the concentrating tank 2A is transported downward (the other end side) by the transporting means 2E, and at one end side (upstream side in the supply direction of the coagulated sludge C) of the concentrating filtration screen 2a of the concentrating means 2. ), Moisture is separated and concentrated by the concentrated filtration screen 2a, and the concentrated sludge concentration is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt%. It is concentrated in the concentration unit 2B in the following range.

The bottom portion (the other end side) of the concentrating tank 2A and the coagulation tank 1A is formed in a truncated cone shape whose diameter decreases toward the bottom. Further, the water separated from the aggregated sludge C by the concentrated filtration screen 2a is stored in the filtrate chamber 2b and treated as wastewater E.

Then, in the concentrating means 2, from the concentrated hot water supply means (not shown), the concentrated hot water F having a temperature higher than 50 ° C. and lower than 100 ° C., preferably a temperature in the range of 60 ° C. or higher and 90 ° C. or lower is pumped 20C. And mixed with the agglomerated sludge C supplied from the agglomerating means 1.

Here, the rotation shaft 2c of the transport means 2E of the concentration means 2 has a hollow cylindrical shape, and a large number (s) of hot water supply ports 6 are formed on the cylindrical wall portion of the rotation shaft 2c. Then, the concentrated hot water F is supplied from the lower end (the other end side) of the rotating shaft 2c to the hollow portion in the rotating shaft 2c, ejected from the hot water supply port 6, and supplied from the aggregating means 1 into the concentrating tank 2A. It is supplied to and mixed with the aggregated sludge C (concentrated sludge D) concentrated by the concentrated unit 2B located on the other end side (downstream in the supply direction of the aggregated sludge C) of the concentrated filtration screen 2a. Here, the other end side (downstream in the supply direction of the aggregated sludge C) of the concentrated filtration screen 2a to which the concentrated hot water F is supplied from the hot water supply port 6 is referred to as a hot water supply unit 2C. As a result, in the present embodiment, the concentrated hot water F supplied from the hot water supply port 6 in the hot water supply unit 2C is supplied to the aggregated sludge C (concentrated sludge D) concentrated in the concentrating unit 2B of the concentrating means 2. As a result, the concentrated sludge D is heated, the protein is thermally denatured, the retained water is separated and discharged as wastewater E together with the concentrated hot water F, and at the same time, the concentrated sludge D mixed with the concentrated hot water F is It is diluted. The hot water supply port 6 may be a member such as an elbow shown in FIG. 1 which is connected to the rotation shaft 2c and whose direction in which the concentrated hot water F is supplied from the hot water supply port 6 is directed downward. It may be a through hole formed in the cylindrical wall portion of the rotation shaft 2c. Since the concentrated hot water F discharged from the hot water supply port 6 has a higher temperature than the concentrated sludge D, the concentrated hot water F discharged from the hot water supply port 6 in FIG. 2 has an arrow indicating the concentrated sludge D in the concentrated sludge D as shown in the figure. Ascend. Therefore, the shielding means 2P is provided above the hot water supply port 6 in the concentrated filtration screen 2a. In the shielding means 2P, the concentrated hot water F stays in the concentrated sludge D for a longer time to raise the temperature of the concentrated sludge D, and the concentrated hot water F passes through the concentrated filtration screen 2a without sufficiently contacting the concentrated sludge D and passes through the filtrate chamber 2b. It is provided so that it will not be discharged. The shielding means 2P is not particularly limited as long as it is made of a material that does not allow water to pass through, and for example, resin, metal, wood, or the like may be used. The hot water supply port 6 is not limited to the case where the concentrated hot water F is supplied downward, and the concentrated hot water F may be supplied in the direction perpendicular to the rotation axis 2c.

The diluted concentrated sludge D is transported further downward (on the other end side) by the transport means 2E, and the water is separated and concentrated by the concentrated filtration screen 2a, so that the concentrated sludge concentration is 6 wt% or more and 12 wt% or less, which is desirable. Is re-concentrated in the re-concentration unit 2D in the range of 7 wt% or more and 11 wt% or less, more preferably 8 wt% or more and 10 wt% or less. Here, in the concentrating means 2, the other end side (downstream side in the supply direction of the aggregated sludge C) from the hot water supply unit 2C is referred to as a reconcentration unit 2D.

The concentrated hot water F and the dehydrated hot water H described later are generated from the flue gas treatment tower drainage of the sludge incineration facility provided in the organic sludge treatment facility, the scrubber drainage of the sludge drying facility, or the digestion gas generator. Hot water can be used. It is also possible to heat clean water, sand filtered water, or the like with a boiler and use it.

In the concentrated sludge supply path 4 in which the concentrated sludge D thus reconcentrated is supplied from the other end side of the concentrating means 2, a pump 4A for sending the concentrated sludge D to the dewatering means 3 is provided, and the pump 4A and the pump 4A are provided. A mixing means 4B such as a high-speed mixer is provided between the dehydrating means 3 and the like. Inorganic flocculants such as ferric polysulfate (PFS) and flocculants G1 such as polymer flocculants are supplied by the pump 4C to the mixing means 4B and added to and mixed with the concentrated sludge D.

Further, a concentrated sludge densitometer SD2 for measuring the sludge concentration of the concentrated sludge D concentrated by the concentrating means 2 may be provided in the subsequent stage of the concentrating means 2, for example, downstream of the pump 4A. In this case, the measurement result of the concentrated sludge densitometer SD2 is input to, for example, a control device 50 electrically connected to the concentrated sludge densitometer SD2, and the control device 50 has a concentrated sludge concentration of 6 wt% or more and 12 wt%. Hereinafter, the suction flow rate of the pump 4A provided downstream of the concentrating means 2 may be controlled so as to be preferably in the range of 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less.

Further, a sludge concentration meter SD1 for measuring the sludge concentration of the organic sludge A, a sludge flow meter FM1 for measuring the flow rate of the organic sludge A, and a sludge flow meter FM1 for measuring the flow rate of the organic sludge A, and the concentration means 2 upstream of the aggregation means 1 in the preceding stage of the concentration means 2. A concentrated sludge flow meter FM2 for measuring the flow rate of the concentrated sludge D concentrated by the concentrating means 2 may be provided in the subsequent stage, for example, downstream of the pump 4A. In this case, the sludge flow rate in the front stage and the rear stage of the concentration means 2 is measured by the sludge flow meter FM1 and the concentrated sludge flow meter FM2, respectively, and is electrically connected to, for example, the sludge flow meter FM1 and the concentrated sludge flow meter FM2. It may be input to the control device 50. At this time, the control device 50 calculates the concentration ratio in the concentration means 2 from the flow rate ratio before and after the concentration means 2, and from this concentration ratio and the sludge concentration measured by the sludge concentration meter SD1 in the previous stage of the concentration means 2. , The concentration of concentrated sludge in the latter stage of the concentrating means 2 is calculated, and concentrated so as to be within the above-mentioned range of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. The suction flow rate of the pump 4A provided downstream of the means 2 may be controlled. Here, there is the following relationship between the suction flow rate of the pump 4A and the concentration of concentrated sludge in the subsequent stage of the concentrating means 2. That is, if the suction flow rate of the pump 4A increases, the concentration ratio in the concentration means 2 decreases, and the concentration of the concentrated sludge in the subsequent stage of the concentration means 2 decreases. On the other hand, if the suction flow rate of the pump 4A decreases, the concentration ratio in the concentration means 2 increases, and the concentration of the concentrated sludge in the subsequent stage of the concentration means 2 increases.

In the present embodiment, in the dehydration means 3 to which the concentrated sludge D to which the flocculant G1 is added and mixed is supplied, a filtration screen 3B for filtering the concentrated sludge D is arranged in the casing 3A, and this filtration is performed. Of the plurality of spaces in the casing 3A separated by the screen 3B, the concentrated sludge D is supplied to the first space 3A1.

Here, the dehydration means 3 in the present embodiment is a vertical screw press, and is arranged in the casing 3A in a cylindrical or conical shape centered on an axis extending in the vertical direction coaxial with the casing 3A. The inner filtration screen 3a as the second filtration screen 3B to be formed, and the inner filtration screen 3a are arranged in the casing 3A at intervals on the outside of the inner filtration screen 3a in a cylindrical or conical shape coaxial with the inner filtration screen 3a. The outer filtration screen 3b is housed between the inner filtration screen 3a and the outer filtration screen 3b in a spiral shape twisting around the axis, and is internally filtered around the axis by a rotary drive means 3c such as a motor. It includes a ribbon screw 3d that is rotated relative to the screen 3a and the external filtration screen 3b.

In the present embodiment, the space between the inner filtration screen 3a and the outer filtration screen 3b is regarded as the first space 3A1 to supply the concentrated sludge D, and the inner space and the outer filtration of the inner filtration screen 3a are supplied. The space inside the casing 3A outside the screen 3b is referred to as the second space 3A2. In the present embodiment, the second space 3A2 also contains the dehydrated hot water H having a temperature in the range of 50 ° C. or higher and lower than 100 ° C., preferably 60 ° C. or higher and 90 ° C. or lower, from the dehydrated hot water supply means (not shown). It is supplied by the pump 3P. The inner filtration screen 3a and the outer filtration screen 3b are also formed of wedge wire, punching metal, or the like.

The casing 3A has a bottomed cylindrical shape centered on the axis, and the concentrated sludge D is a supply pipe 3f connected to a ring-shaped connecting plate 3e connecting the bottoms of the inner filtration screen 3a and the outer filtration screen 3b. The water is separated by the inner filtration screen 3a and the outer filtration screen 3b while being supplied to the first space 3A1 from the bottom of the casing 3A and being conveyed upward by the relative rotation of the ribbon screw 3d.

Further, a ring plate-shaped substrate 3C is disposed in the upper part of the casing 3A, and the outer filtration screen 3b is attached to and fixed to the inner peripheral portion of the substrate 3C. Further, a lid 3D is disposed in the upper opening of the casing 3A above the substrate 3C, the internal filtration screen 3a is attached to and fixed to the lid 3D, and the rotation driving means 3c is used. , The ribbon screw 3d is rotated via a cylindrical screw support that is placed on the lid 3D and covers the upper part of the internal filtration screen 3a.

In the present embodiment, the inner filtration screen 3a and the outer filtration screen 3b are fixed to the casing in this way, and the ribbon screw 3d is rotated by the rotation driving means 3c, but conversely, the ribbon screw 3d is fixed and inside. The filtration screen 3a and the outer filtration screen 3b may be rotated, or the ribbon screw 3d and the inner filtration screen 3a and the outer filtration screen 3b may be rotated in opposite directions to each other.

Furthermore, the upper space in the casing 3A between the substrate 3C and the lid 3D is the discharge chamber 3E, and the annular upper opening of the first space 3A1 in the discharge chamber 3E is the discharge port 3F. The discharge port 3F is provided with a squeezing ring 3G having a truncated cone-shaped outer peripheral surface centered on the axis that goes upward toward the outer peripheral side. The dehydrated sludge I dehydrated from the concentrated sludge D while being conveyed upward through the first space 3A1 by the ribbon screw 3d flows out to the discharge chamber 3E while being squeezed by the squeezing ring 3G from the discharge port 3F. It is discharged.

Further, the dehydrated hot water H is also supplied from the bottom of the casing 3A to the second space 3A2 in the casing 3A in the present embodiment. The dehydrated hot water H supplied to the second space 3A2 in this way heats the concentrated sludge D in the first space 3A1 in the same manner as the concentration means 2, and the protein of the concentrated sludge D is thermally denatured thereby retaining water. The drainage pipe raised from the second space 3A2 together with the dehydrated hot water H that has been separated, filtered by the inner filtration screen 3a and the outer filtration screen 3b, and cooled by heating the concentrated sludge D. It is discharged as drainage J from 3H.

In the organic sludge treatment equipment and treatment method having such a configuration, the coagulated sludge aggregated by adding the polymer flocculant B to the organic sludge A containing the protein in the coagulation means 1 in front of the dehydration means 3. Concentrating means 2 for concentrating C is provided, and the concentrated sludge D concentrated by the concentrating means 2 is dehydrated by the dewatering means 3.

In this concentrating means 2, the concentrated sludge D concentrated in the concentrating section 2B to a concentration of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. In addition, concentrated hot water F having a temperature higher than 50 ° C. and a temperature in the range of less than 100 ° C. is supplied from the concentrated hot water supply means (not shown) in the hot water supply unit 2C and mixed with the concentrated sludge D. Since the concentrated sludge D is concentrated to the extent that the fluidity and heating efficiency are not impaired, the amount of heat required for heating the concentrated sludge D can be reduced. Since the concentrated sludge D is heated and the concentrated sludge D is further diluted by the concentrated hot water F, the fluidity is further increased, so that the concentrated hot water F is spread over the entire concentrated sludge D without strong stirring. The concentrated sludge D is heated in a uniform manner without breaking the aggregated state. Further, in the concentrating means 2, the heated and diluted concentrated sludge D is reconcentrated in the reconcentration unit 2D. Therefore, in the hot water supply unit 2C of the concentration means 2 in the previous stage of the dehydration means 3, the concentrated sludge D can be heated to heat-denature the protein, and the water retained in the concentrated sludge D can be separated in the latter stage. The dehydration efficiency in the dehydration means 3 can be improved. Since the concentrated sludge D that has been heated and diluted is reconcentrated, the dewatering efficiency in the dewatering means 3 in the subsequent stage is not impaired.

Here, in FIGS. 3, 5, and 7, according to the first embodiment, three types of organic sludge A having a sludge concentration of 2 wt% are supplied to the aggregating means 1 at 10 m ³ / h, respectively, and aggregated. First to third examples showing the relationship between the temperature of the concentrated hot water F and the water content of the concentrated sludge D when the sludge C is concentrated while being heated by the concentrated hot water F of 3.3 m ³ / h in the concentrating means 2. 4, FIG. 6, and FIG. 8 are diagrams showing the relationship between the temperature and the water content of the concentrated sludge D heated by the concentrated hot water F in the first to third examples.

The organic sludge A of the first example is mixed raw sludge, the organic sludge A of the second example is a mixed raw sludge of excess rich, and the organic sludge A of the third example is digestive sludge. Further, in the first to third examples, the concentrated hot water F is obtained by heating the clean water in a boiler. In the first example, 11 wt% ferric sulfate (PFS) is used, and in the second example, 5 wt%. Polyferric sulfate (PFS) is added.

From FIGS. 3, 5, and 7, when the temperature of the concentrated hot water F supplied to the concentrating means 2 and mixed with the aggregated sludge C exceeds 50 ° C., the temperature of the concentrated hot water F increases with respect to the ratio. It can be seen that the ratio of the concentrated sludge D, which is the aggregated sludge C concentrated by the concentrating means 2, to decrease begins to increase, and the water content tends to decrease as the temperature of the concentrated hot water F increases. Therefore, according to the organic sludge treatment equipment and treatment method having the above configuration, it is possible to reduce the water content of the concentrated sludge D as described above, and improve the dewatering efficiency in the dewatering means 3 in the subsequent stage of the concentrating means 2. Can be planned. The reason why the two points are plotted at the hot water temperature of 80 ° C. in FIG. 5 is that the concentrated hot water F at 80 ° C. was repeatedly supplied twice.

Further, by mixing the concentrated hot water F with the aggregated sludge C in the concentrating means 2 in this way, the aggregation inhibitor contained in the liquid of the aggregated sludge C can be replaced with the concentrated hot water F, so that the concentrated sludge supply channel can be used. In No. 4, it is possible to prevent the flocculant G1 such as polyferrous sulfate added to the concentrated sludge D from being consumed by the aggregation inhibitor, and the flocculant G1 is efficiently reacted with the solid content of the concentrated sludge D. be able to.

Further, by heating the aggregated sludge C with the concentrated hot water F, the reactivity between the aggregated sludge G1 and the concentrated sludge D can be improved, and the amount of the aggregated agent G1 added can be reduced. Further, since the aggregated sludge C is heated in this way, the water content of the concentrated sludge D is lowered and the viscosity is lowered, so that the dehydration efficiency when the concentrated sludge D is dehydrated by the dewatering means 3 is further improved. Can be done.

If the temperature of the concentrated hot water F is 50 ° C. or lower, the water content of the concentrated sludge D cannot be effectively reduced as shown in FIGS. 3, 5, and 7. Further, if the temperature of the concentrated hot water F is 100 ° C. or higher, the handleability of the concentrated hot water F is impaired. Further, the higher the temperature of the concentrated hot water F, the more the water separation and the decrease in viscosity due to the thermal denaturation of the protein of the concentrated sludge D can be promoted. However, as described above, the hot water used in the organic sludge treatment facility. When is used as the dehydrated hot water H, a temperature range of 60 ° C. or higher and 90 ° C. or lower is realistic.

Furthermore, in order to further improve the dewatering efficiency in the dewatering means 3 in the subsequent stage of the concentrating means 2 as described above, the concentrated sludge concentration of the concentrated sludge D concentrated by the concentrating means 2 is 6 wt% or more and 12 wt% or less. It is desirable that the concentration is 7 wt% or more and 11 wt% or less, and it is further desirable that the concentration is in the range of 8 wt% or more and 10 wt% or less. A desirable sludge concentration will be described with reference to FIG. 9, which shows the relationship between the concentrated sludge concentration and the concentrated sludge temperature.

In FIG. 9, sludge having a sludge concentration of 3 wt% is charged into the concentrating means 2 at a flow rate of 2.0 m ³ / h, and the sludge is concentrated from 3 wt% to 13 wt% in 1 wt% increments under the condition of 15 ° C. Table 1 is a graph showing the measurement results of the concentrated sludge temperature when the sludge was concentrated in No. 2 and the sludge was further supplied with concentrated hot water at 90 ° C. at 1.0 m ³ / h. Here, it can be seen that the flow rate of sludge in the concentrating means 2 is proportional to the sludge concentration. That is, when the sludge flow rate in the concentrating means 2 is as small as 0.46 m ³ / h, a high concentrated sludge concentration of 13 wt% is obtained, and when the sludge flow rate is as large as 2.00 m ³ / h, 3 wt%. And low concentrated sludge concentration is obtained. Further, from FIG. 9 and Table 1, when the concentrated sludge concentration is 6 wt% or more and 12% or less, the concentrated sludge temperature (heated concentrated sludge) falls in the range of 47.8 ° C to 55.8 ° C, and the concentrated sludge concentration becomes high. When it is 7 wt% or more and 11% or less, the concentrated sludge temperature falls in the range of 52.6 ° C to 55.8 ° C, and when the concentrated sludge concentration is 8 wt% or more and 10 wt% or less, the concentrated sludge temperature is 55.0 ° C. It falls in the range of 55.8 ° C. That is, FIGS. 4, 6 and 8 show that the higher the sludge temperature, the lower the water content of the concentrated sludge D. Therefore, the concentrated sludge concentration of the concentrated sludge D can be kept high at 6 wt%. 12 wt% or more is preferable, and the concentrated sludge concentration of 7 wt% or more and 11 wt% or less, which can keep the concentrated sludge temperature of concentrated sludge D at a higher temperature, is more preferable, and the concentrated sludge temperature of concentrated sludge D is kept at a higher temperature. It is more preferable to concentrate the sludge in a range of 8 wt% or more and 10 wt% or less.

Further, in the organic sludge treatment equipment and treatment method of the present embodiment, even in the dehydration means 3, among the plurality of spaces arranged in the casing 3A and divided by the filtration screen 3B for filtering the concentrated sludge D, the first The concentrated sludge D is supplied to the space 3A1 of 1, and the dehydrated hot water H having a temperature higher than 50 ° C. and a temperature of less than 100 ° C. is supplied to the second space 3A2 from the dehydrated hot water supply means. Further, when the concentrated sludge D supplied to the first space 3A1 is heated by the dehydrated hot water H supplied to the second space 3A2 in this way, the viscosity of the concentrated sludge D is lowered and the concentrated sludge D is concentrated. The water retained in the sludge D is separated by heat denaturation of the protein.

The water separated from the concentrated sludge D is filtered through the filtration screen 3B, flows into the second space 3A2, and is discharged together with the cooled dehydrated hot water H, so that the water is discharged from the discharge port 3F to the discharge chamber 3E. The water content of the dehydrated sludge I to be produced can be further reduced. Further, as described above, since the filtration resistance decreases due to the decrease in the viscosity of the concentrated sludge D, it is possible to facilitate the discharge of the water separated from the concentrated sludge D into the second space 3A2. Therefore, according to the present embodiment, it is possible to reduce the water content of the dehydrated sludge I and efficiently discharge the water separated from the concentrated sludge D.

Here, if the temperature of the dehydrated hot water H is 50 ° C. or lower, the effects of lowering the viscosity of the concentrated sludge D and separating water as described above cannot be sufficiently obtained. Further, if the temperature of the dehydrated hot water H exceeds 100 ° C., it becomes difficult to handle the same as the concentrated hot water F. The higher the temperature of the dehydrated hot water H, the lower the viscosity of the concentrated sludge D and the promotion of water separation due to the thermal denaturation of the protein. However, as described above, the hot water used in the organic sludge treatment facility can be used. When used as the dehydrated hot water H, the temperature range of 60 ° C. or higher and 90 ° C. or lower is realistic as in the concentrated hot water F.

Further, in the processing equipment of the present embodiment, as the dehydration means 3, an internal filtration screen 3a arranged in the casing 3A in a cylindrical or conical shape centered on an axis extending in the vertical direction, and the internal filtration thereof. The outer filtration screen 3b, which has a cylindrical or conical shape coaxial with the screen 3a and is arranged inside the casing 3A at intervals on the outside of the inner filtration screen 3a, and the inner filtration screen 3b which is twisted around the axis. A vertical screw press housed between the filtration screen 3a and the outer filtration screen 3b and provided with a ribbon screw 3d housed between the outer filtration screen 3a and rotated relative to the inner filtration screen 3a and the outer filtration screen 3b about this axis. It is used.

The space between the inner filtration screen 3a and the outer filtration screen 3b as the filtration screen 3B is the first space 3A1 to which the concentrated sludge D is supplied, and the space inside and outside the inner filtration screen 3a. The space outside the filtration screen 3b is the second space 3A2 to which the dehydrated hot water H is supplied.

In the vertical screw press having such a configuration, the concentrated sludge D supplied to the first space 3A1 between the inner filtration screen 3a and the outer filtration screen 3b is oriented in the axial direction by the relative rotation of the ribbon screw 3d. Since the inner filtration screen 3a and the outer filtration screen 3b are dehydrated while being transported, a large filtration area can be secured and more efficient filtration can be achieved. Further, since the concentrated sludge D supplied to the first space 3A1 can be heated by the dehydrated hot water H supplied to the second space 3A2 inside and outside the first space 3A1, heat denaturation of the protein can be performed. The separation of water can be promoted more efficiently.

However, in the present embodiment, the vertical screw press having the two filtration screens 3B of the inner filtration screen 3a and the outer filtration screen 3b is used as the dehydration means 3, but the axis extending in the vertical direction is the center. A vertical screw press in which a screw that forms a spiral that twists around this axis and is rotated around the axis is arranged in one cylindrical or conical filtration screen, as described below. It is also possible to use a horizontal screw press or a belt press as described above. In addition to these, a rotary press or a multi-plate screw press can also be used.

Next, FIG. 10 shows a first modification of the enrichment means 2 and the dehydration means 3 of the first embodiment shown in FIGS. 1 and 2, and is the first modification shown in FIGS. 1 and 2. The same part number is arranged in the part common to the embodiment of. In this first modification, the concentrating means 2 is a screw type concentrator.

That is, in the concentrating means 2 in the first modification, the body of the concentrating means 2 is a concentrated filtration screen 11a, and the aggregated sludge C is supplied from one end side to the inside, and the outer periphery of the concentrated filtration screen 11a is a filtrate chamber 11b. A screw 12b is attached to a cylindrical casing 11 having a central axis extending laterally and a rotary shaft 12a along the central axis of the casing 11, and a rotary shaft 12a and a screw 12b are attached by a rotary drive means (not shown). It is provided on one end side (upstream side in the supply direction of the aggregated sludge C) of the concentrated filtration screen 11a, which concentrates the aggregated sludge C supplied in the concentrated filtration screen 11a by rotating by separating water. A concentrating unit 2B and a transporting means 12 for transporting the aggregated sludge C from one end side to the other end side (downstream side in the supply direction of the aggregated sludge C) in the concentrated filtration screen 11a by rotating the rotating shaft 12a and the screw 12b are provided. ing. In the concentration unit 2B, the aggregated sludge C is concentrated to a concentration of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less to obtain concentrated sludge D.

Then, on the transport direction side (the other end side of the concentrated filtration screen 11a) of the aggregated sludge C by the transport means 12, the concentrated hot water F is transferred from the concentrated hot water supply means (not shown) to the concentrated filtration screen 11a as in the first embodiment. It is supplied to the concentrated sludge D located on the other end side of the concentration unit 2B (downstream in the supply direction of the aggregated sludge C), and is mixed with the concentrated sludge D by the rotation of the screw 12b. Here, the rotating shaft 12a of the transporting means 12 of the concentrating means 2 has a hollow cylindrical shape, and a large number (s) of hot water supply ports 6 are formed on the cylindrical wall portion of the rotating shaft 12a. Then, the concentrated hot water F is supplied from one end side of the rotating shaft 12a (upstream side in the supply direction of the concentrated hot water) to the hollow portion in the rotating shaft 12a and ejected from the hot water supply port 6, and is ejected from the hot water supply port 6 from the aggregating means 1 to the concentrating means 2. It is supplied to the coagulated sludge C (concentrated sludge D) concentrated in the concentrating unit 2B, which is located on the other end side (downstream in the supply direction of the coagulated sludge C) of the concentrating part 2B in the concentrated filtration screen 11a. Be mixed. Here, the other end side (downstream in the supply direction of the aggregated sludge C) of the concentrated filtration screen 11a to which the concentrated hot water F is supplied from the hot water supply port 6 is referred to as a hot water supply unit 2C. The hot water supply port 6 may be connected to the rotating shaft 12a, and may be a member such as a straight pipe shown in FIG. 10 in which the direction in which the concentrated hot water F is supplied from the hot water supply port 6 is perpendicular to the rotating shaft 12a. It may be a through hole formed in the cylindrical wall portion of the rotation shaft 12a. The direction in which the concentrated hot water F is supplied does not have to be exactly perpendicular to the rotation axis 12a. As a result, in this modification, the concentrated sludge D is heated by supplying the concentrated hot water F in the hot water supply unit 2C to the aggregated sludge C (concentrated sludge D) concentrated in the concentrating unit 2B of the concentrating means 2. The protein is thermally denatured, the retained water is separated and discharged as wastewater E together with the concentrated hot water F, and at the same time, the concentrated sludge D mixed with the concentrated hot water F is diluted. The diluted concentrated sludge D is conveyed to the other end side (downstream in the supply direction of the aggregated sludge C) of the hot water supply unit 2C in the concentrated filtration screen 11a by the transport means 12, and the water is removed by the concentrated filtration screen 11a. It is separated and concentrated, and the concentrated sludge concentration is reconcentrated in the reconcentration unit 2D in the range of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. Here, in the concentrated filtration screen 11a of the concentrating means 2, the other end side (downstream side in the supply direction of the aggregated sludge C) from the hot water supply unit 2C is referred to as a reconcentration unit 2D. The concentrated sludge D reconcentrated in this way is extracted by the pump 4A and supplied to the dehydrating means 3, but since the flocs of the concentrated sludge D are liable to collapse due to heating, polymer aggregation is performed in addition to the inorganic flocculant G. A small amount of the agent g may be added.

Here, on the outer periphery of the hot water supply unit 2C in the concentrated filtration screen 11a, a shielding means 2P is provided along the outer periphery of the concentrated filtration screen 11a. In the shielding means 2P, the concentrated hot water F stays in the concentrated sludge D for a longer time to raise the temperature of the concentrated sludge D, and the concentrated hot water F passes through the concentrated filtration screen 11a without sufficiently contacting the concentrated sludge D and passes through the filtrate chamber. It is provided so as not to be discharged to 11b. The shielding means 2P is not particularly limited as long as it is made of a material that does not allow water to pass through, and for example, resin, metal, wood, or the like may be used. The shielding means 2P may be provided in a cylindrical shape so as to cover the entire circumference of the hot water supply unit 2C in the concentrated filtration screen 11a, or a semi-cylinder so as to cover the lower half of the hot water supply unit 2C in the concentrated filtration screen 11a. It may be provided in a shape.

Further, although not shown in FIG. 10, as in the first embodiment shown in FIGS. 1 and 2, a sludge concentration meter SD1 and a sludge flow meter FM1 are provided in front of the concentrating means 2, and a sludge flow meter FM1 is provided in the rear stage of the concentrating means 2. A concentrated sludge concentration meter SD2 and a concentrated sludge flow meter FM2 are provided in the center, and the measurement results are input to the control device 50 electrically connected to these, and the measurement results from the concentrated sludge concentration meter SD2 are received. The transport means 12 of the concentration means 2 so that the control device 50 has a concentration of concentrated sludge of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. The transport speed may be controlled by controlling the number of rotations of the rotation driving means for rotating the rotation shaft 12a and the screw 12b. Alternatively, the sludge flow rate measured by the sludge flow meter FM1 and the concentrated sludge flow meter FM2 is input to the control device 50, the concentration ratio in the concentration means 2 is calculated from the flow ratio before and after the concentration means 2, and this concentration ratio is used. From the sludge concentration measured by the sludge concentration meter SD1 in the previous stage of the concentrating means 2, the concentrated sludge concentration in the latter stage of the concentrating means 2 is calculated, and this is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and further. The transport speed of the transport means 12 of the concentrating means 2 is controlled by controlling the rotation speed of the rotary drive means for rotating the rotary shaft 12a and the screw 12b so as to preferably fall within the range of 8 wt% or more and 10 wt% or less. Is also good. When controlling the rotation speed of the rotation driving means, the rotation speed in the concentrating unit 2B and the rotation speed in the reconcentrating unit 2D may be individually controlled.

Further, in this first modification, the dehydration means 3 also uses a horizontal screw press. That is, in the dehydration means 3 in the first modification, the body is a dehydration filtration screen 13a and the concentrated sludge D is supplied to the inside, and the outer periphery of the dehydration filtration screen 13a is a filtrate chamber 13b in the lateral direction. A screw 14b is attached to a cylindrical casing 13 having a central axis extending to and a rotary shaft 14a along the central axis of the casing 13, and the rotary shaft 14a and the screw 14b are rotated by a rotary drive means (not shown). It is provided with a transport means 14 for transporting the concentrated sludge D.

Here, the screw 14b in the transporting means 14 of the dehydration means 3 is designed so that the pitch becomes smaller in the transporting direction of the concentrated sludge D, and is compressed while the concentrated sludge D is being transported by the screw 14b. Be dehydrated. Also in this first modification, the dehydration hot water H may be supplied and mixed by the dehydration means 3.

Next, FIG. 11 shows a second modification of the enrichment means 2 and the dehydration means 3 of the first embodiment shown in FIGS. 1 and 2, and the first is shown in FIGS. 1 and 2. The same part number is also arranged in the part common to the embodiment of. In this second modification, the concentrating means 2 is a belt-type concentrator.

That is, the concentrating means 2 in the second modification is provided with an endless concentrated filtering filter cloth 22 wound around a plurality of rolls 21 so as to be able to run, and the concentrated filtering filter cloth 22 is provided from one end side. The aggregated sludge C supplied to the sludge supply unit 22a on one end side (the side opposite to the traveling direction R of the concentrated filtration filter cloth 22) in the concentrated filtration unit 22A traveling horizontally to the other end side is collected by the concentrated filtration filter cloth 22. It is filtered and concentrated by separating water by gravity. In the concentrated sludge 2B provided on one end side (upstream side in the supply direction of the aggregated sludge C) of the concentrated filtration unit 22A, the concentrated sludge concentration of the aggregated sludge C is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt%. Hereinafter, more preferably, the sludge D is concentrated in the range of 8 wt% or more and 10 wt% or less.

In this second modification, the sludge supply unit 22a in the concentrated filtration unit 22A is closer to the traveling direction R side of the concentrated filtration filter cloth 22, that is, the other end side than the concentration unit 2B in the concentrated filtration unit 22A ( Concentrated sludge D located on the other end side (downstream of the supply direction of the agglomerated sludge C) from the concentrated hot water supply means, which is also not shown, on the other end side of the concentrated section 2B in the concentrated filtration section 22A. Is supplied to and mixed with concentrated sludge D. Here, the other end side (downstream in the supply direction of the aggregated sludge C) of the concentrated filtration unit 22A to which the concentrated hot water F is supplied is referred to as a hot water supply unit 2C. As a result, in this modification, the concentrated sludge D is heated by supplying the concentrated hot water F in the hot water supply unit 2C to the aggregated sludge C (concentrated sludge D) concentrated in the concentrating unit 2B of the concentrating means 2. The protein is thermally denatured, the retained water is separated and discharged as wastewater E together with the concentrated hot water F, and at the same time, the concentrated sludge D mixed with the concentrated hot water F is diluted. The diluted concentrated sludge D is further conveyed to the other end side (downstream in the supply direction of the aggregated sludge C) by the concentrated filtration unit 22A, and the water is separated and concentrated by the concentrated filtration unit 22A, and the concentration of the concentrated sludge is 6 wt. % Or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less in the reconcentration unit 2D. Here, the other end side (downstream side in the supply direction of the aggregated sludge C) of the concentrated filtration unit 22A from the hot water supply unit 2C is referred to as a reconcentration unit 2D. In the reconcentration unit 2D, the inorganic flocculant G may be supplied to the concentrated sludge D. Further, a screw 23 for reacting the inorganic flocculant G with the concentrated sludge D may be provided. Further, in the concentrated filtration unit 22A, the concentrated filtration filter cloth 22 traveling horizontally from one end side to the other end side is conveyed, and the aggregated sludge C or the concentrated sludge D is conveyed from one end side to the other end side of the concentrated filtration unit 22A. It may be regarded as a means of transportation.

Here, the hot water supply unit 2C of the concentrated filtration unit 22A is provided with the shielding means 2P on the lower side of the concentrated filtration unit 22A so as to slide on the concentrated filtration filter cloth 22. That is, in the hot water supply unit 2C, the concentrated filtration filter cloth 22 runs horizontally from one end side to the other end side while sliding on the fixed shielding means 2P. The shielding means 2P is not particularly limited as long as it is made of a material that does not allow water to pass through, and for example, resin, metal, wood, or the like may be used. The shielding means 2P is formed, for example, in the shape of a plate so as not to interfere with the running of the concentrated filtration filter cloth 22. When such a plate-shaped shielding means 2P is provided so as to slide on the concentrated filtration filter cloth 22, the aggregated sludge C diluted with the concentrated hot water F supplied by the hot water supply unit 2C and whose fluidity is increased is generated. , Side leaks that overflow to the outside of the concentrated filter cloth 22 may occur from both ends in the direction perpendicular to the traveling direction of the concentrated filter cloth 22. In order to prevent this, side leak prevention plates 300 are provided on the concentrated filter cloth 22 at both ends in the direction perpendicular to the traveling direction of the concentrated filter cloth 22 so as to slide with the concentrated filter cloth 22. There is. The side leak prevention plate 300 is formed longer in the traveling direction of the concentrated filtration filter cloth 22 than the shielding means 2P, and is made of the same material as the shielding means 2P. In this way, the shielding means 2P is provided under the concentrated filtration filter cloth 22 so as to slide on the concentrated filtration filter cloth 22 running horizontally from one end side to the other end side, and the concentrated filtration filter cloth 22 is provided with the shielding means 2P. By providing the side leak prevention plates 300 on the concentrated filtration filter cloth 22 at both ends in the direction perpendicular to the traveling direction, the concentrated hot water F stays in the concentrated sludge D for a longer time to raise the temperature of the concentrated sludge D and the concentrated hot water. The aggregated sludge C, which is not sufficiently contacted with the concentrated sludge D and is not discharged through the concentrated filtration section 22A and is diluted with the concentrated hot water F to improve the fluidity, is directed to the traveling direction of the concentrated filtration filter cloth 22. It is configured so as not to overflow to the outside of the concentrated filtration filter cloth 22 from both ends in the perpendicular direction.

Further, although not shown in FIG. 11, as in the first embodiment shown in FIGS. 1 and 2, a sludge concentration meter SD1 and a sludge flow meter FM1 are provided in front of the concentrating means 2, and a sludge flow meter FM1 is provided in the rear stage of the concentrating means 2. A concentrated sludge concentration meter SD2 and a concentrated sludge flow meter FM2 are provided in the center, and the measurement results are input to the control device 50 electrically connected to these, and the measurement results from the concentrated sludge concentration meter SD2 are received. Conveying means for concentrating means 2 so that the concentrated sludge concentration is within the range of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. The speed may be controlled by controlling the rotation speed of the rotation driving means (not shown) for driving the concentrated filtration filter cloth 22. Alternatively, the sludge flow rate measured by the sludge flow meter FM1 and the concentrated sludge flow meter FM2 is input to the control device 50, and the concentration ratio in the concentration means 2 is calculated from the flow ratio before and after the concentration means 2, and this concentration ratio is used. From the sludge concentration measured by the sludge concentration meter SD1 in the front stage of the concentration means 2, the concentrated sludge concentration in the rear stage of the concentration means 2 is calculated, and this is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and further. The transport speed of the transport means of the concentration means 2 is controlled by controlling the rotation speed of the rotation drive means (not shown) for driving the concentration filter sludge 22 so as to be preferably in the range of 8 wt% or more and 10 wt% or less. May be. When controlling the rotation speed of the rotation driving means, the rotation speed in the concentrating unit 2B and the rotation speed in the reconcentrating unit 2D may be individually controlled.

Further, in this second modification, the dehydration means 3 is also a belt press. That is, in the dehydration means 3, the dehydration filter cloth 31 is wound around a plurality of rolls 32 so as to be able to run, and the compressed filter cloth 33 is sandwiched between the dehydration filter cloth 31 and the concentrated sludge D. Is wound around the plurality of rolls 32 so as to be able to run, and the concentrated sludge D is squeezed and dehydrated between the dehydrated filter cloth 31 and the squeezed filter cloth 33.

In this second modification, the dehydrated filter cloth 31 of the dehydrating means 3 is continuously endless with the concentrated filtered filter cloth 22 of the concentrating means 2, and the dehydrated filter cloth 31 obtained by dehydrating the concentrated sludge D is formed. Is returned to the concentrating means 2 as a concentrated filtration filter cloth 22. Further, also in this second modification, the dehydrated hot water H may be supplied to the concentrated sludge D supplied in the dehydrating means 3 and mixed.

Further, in addition to the screw type concentrator and the belt type concentrator as in the first and second modifications of the concentrating means 2 of the first embodiment, the third to sixth modifications can be applied. I can do it, so I will explain the details.

FIG. 12 shows a third modification of the enrichment means 2 of the first embodiment shown in FIGS. 1 and 2, and is common to the first embodiment shown in FIGS. 1 and 2. The same part number is also assigned to. In this third modification, the concentrating means 2 is a multiple disk type concentrator.

That is, the concentrating means 2 in this third modification includes a filter body 19 having a plurality of fixed plates 17 arranged at intervals from each other and a movable plate 18 arranged between adjacent fixed plates 17. , The gap between the casing 30 that accommodates the filter body 19 and the agglomerated sludge C supplied from the agglomerating means 1 and has a central axis extending from one end side to the other end side, and the fixed plate 17 and the movable plate 18 that performs eccentric rotational movement. Concentrates the aggregated sludge C supplied from the side surface on one end side (lower side surface 60) of the casing 30 to the outside of the filter body 19, and concentrates on one end side (upstream side in the supply direction of the aggregated sludge C) in the casing 30. A part 2B and the like are provided. In the concentrating unit 2B, since the gap between the fixed plate 17 and the movable plate 18 is smaller than the particle size of the aggregated sludge C, water is separated from the aggregated sludge C and discharged from the filter body 19, and the aggregated sludge C is discharged. The concentrated sludge concentration is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less to obtain concentrated sludge D.

In the third modification, the agglomerated sludge C supplied from the agglomerating means 1 is supplied to the outside of the filter body 19 from the side surface (lower side surface 60) on one end side of the casing 30, and is filtered with the inner surface of the casing 30. The flow path defined by the outside of the body 19 is constantly flowing toward the other end side of the casing 30. Therefore, in the third modification, the flow path defined by the inner surface of the casing 30 and the outer surface of the filter body 19 is regarded as a transporting means for transporting the aggregated sludge C from one end side to the other end side of the casing 30. It's okay.

Further, in the concentrating means 2 in the third modification, the concentrated hot water F is supplied from the side surface of the central portion of the casing 30 into the casing 30 from the concentrated hot water supply means (not shown), and is different from the concentrating portion 2B in the casing 30. It is mixed with the concentrated sludge D located on the end side (downstream in the supply direction of the aggregated sludge C), the concentrated sludge D is heated, and the concentrated sludge D is further diluted. A hot water supply unit 2C provided (downstream in the supply direction of sludge C) is provided. As a result, in this modification, the concentrated sludge D is heated by supplying the concentrated hot water F in the hot water supply unit 2C to the aggregated sludge C (concentrated sludge D) concentrated in the concentrating unit 2B of the concentrating means 2. The protein is thermally denatured, the retained water is separated and discharged as wastewater E together with the concentrated hot water F, and at the same time, the concentrated sludge D mixed with the concentrated hot water F is diluted.

Further, in the concentration means 2 in the third modification, the heated and diluted concentrated sludge D is reconcentrated by the filter body 19 on the other end side of the hot water supply unit 2C in the casing 30 (supply of the organic sludge). It is provided with a reconcentration unit 2D provided in the downstream direction). In the reconcentration unit 2D, the water is separated and concentrated again from the diluted concentrated sludge D by the filter body 19, and the concentrated sludge concentration is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, more preferably. It is reconcentrated to the range of 8 wt% or more and 10 wt% or less. Finally, the concentrated sludge D is discharged from the upper part (the other end side) of the casing 30.

Here, the fixed plate 17 and the movable plate 18 are not provided at the position of the filter body 19 located at a height corresponding to the hot water supply unit 2C, but a cylindrical shielding means 2P is provided. The shielding means 2P prevents the concentrated hot water F from staying in the concentrated sludge D for a longer period of time to raise the temperature of the concentrated sludge D and preventing the concentrated hot water F from sufficiently contacting the concentrated sludge D and being discharged through the filter body 19. It is provided. The shielding means 2P may be configured, for example, by integrally forming a fixed plate 17 and a movable plate 18 provided in the hot water supply unit 2C in a cylindrical shape. Alternatively, the shielding means 2P may be a cylindrical member provided around the fixed plate 17 and the movable plate 18 so as not to interfere with the movable plate 18 that performs the eccentric rotational movement.

Further, although not shown in FIG. 12, as in the first embodiment shown in FIGS. 1 and 2, a sludge concentration meter SD1 and a sludge flow meter FM1 are provided in front of the concentrating means 2, and a sludge flow meter FM1 is provided in the rear stage of the concentrating means 2. A concentrated sludge concentration meter SD2 and a concentrated sludge flow meter FM2 are provided in the center, and the measurement results are input to the control device 50 electrically connected to these, and the measurement results from the concentrated sludge concentration meter SD2 are received. Concentrating sludge concentration is within the range of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. The speed may be controlled, for example, by controlling the suction flow rate of the pump 4A provided downstream of the concentrating means 2. Alternatively, the sludge flow rate measured by the sludge flow meter FM1 and the concentrated sludge flow meter FM2 is input to the control device 50, and the concentration ratio in the concentration means 2 is calculated from the flow ratio before and after the concentration means 2, and this concentration ratio is used. , The concentrated sludge concentration in the latter stage of the concentrating means 2 is calculated from the sludge concentration measured by the sludge concentration meter SD1 in the first stage of the concentrating means 2, and this is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and further. The transport speed of the transport means of the concentrating means 2 may be controlled, for example, by controlling the suction flow rate of the pump 4A provided downstream of the concentrating means 2 so as to be within the range of 8 wt% or more and 10 wt% or less. ..

In this third modification, the dehydration means 3 may use the vertical screw press in the present embodiment shown in FIG. 1 in the same manner as in the present embodiment.

FIG. 13 shows a fourth modification of the enrichment means 2 of the first embodiment shown in FIGS. 1 and 2, and is common to the first embodiment shown in FIGS. 1 and 2. The same part number is also assigned to. In this fourth modification, the concentrating means 2 is a rotary drum type concentrator.

That is, the concentrating means 2 in the fourth modification has a body portion of the concentrated filtration screen 140a in which the condensed sludge C is supplied from one end side, and one end side of the body portion (upstream in the supply direction of the condensed sludge C). Concentrating section 2B provided on the side) and concentrating the aggregated sludge C supplied from one end side to the concentrated filtration screen 140a by separating water by the concentrated filtration screen 140a, and a filtration chamber provided on the outer periphery of the concentrated filtration screen 140a. The 140b is provided with a casing 140 including the body portion and the filtration chamber 140b and having a central axis extending laterally from one end side to the other end side. In the concentration unit 2B, the aggregated sludge C is concentrated to a concentration of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less to obtain concentrated sludge D.

The concentration means 2 in the fourth modification further has a guide 15b for transporting spiral sludge on the inner peripheral surface of the concentration filtration screen 140a, and one end of the aggregated sludge C is caused by the rotation of the concentration filtration screen 140a. Concentrated hot water F is supplied from the transport means 15 for transporting from the side to the other end side and the concentrated hot water supply means (not shown), and the other end side (downstream in the supply direction of the aggregated sludge C) from the concentrating portion 2B in the concentrated filtration screen 140a. ) Is mixed with the concentrated sludge D, the concentrated sludge D is heated, and the concentrated sludge D is further diluted. The hot water supply unit 2C is provided. As a result, in this modification, the concentrated sludge D is heated by supplying the concentrated hot water F in the hot water supply unit 2C to the aggregated sludge C (concentrated sludge D) concentrated in the concentrating unit 2B of the concentrating means 2. The protein is thermally denatured, the retained water is separated and discharged as wastewater E together with the concentrated hot water F, and at the same time, the concentrated sludge D mixed with the concentrated hot water F is diluted. The diluted concentrated sludge D is conveyed to the other end side (downstream in the supply direction of the aggregated sludge C) of the hot water supply unit 2C in the concentrated filtration screen 140a by the transport means 15, and the water is removed by the concentrated filtration screen 140a. It is separated and concentrated, and the concentrated sludge concentration is reconcentrated in the reconcentration unit 2D in the range of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. Here, the other end side (downstream side in the supply direction of the aggregated sludge C) of the concentrated filtration screen 140a of the concentrating means 2 with respect to the hot water supply unit 2C is referred to as a reconcentration unit 2D.

Here, on the outer periphery of the hot water supply unit 2C in the concentrated filtration screen 140a, a shielding means 2P is provided along the outer periphery of the concentrated filtration screen 140a. In the shielding means 2P, the concentrated hot water F stays in the concentrated sludge D for a longer time to raise the temperature of the concentrated sludge D, and the concentrated hot water F passes through the concentrated filtration screen 140a without sufficiently contacting the concentrated sludge D and passes through the filtrate chamber 140b. It is provided so that it will not be discharged. The shielding means 2P is not particularly limited as long as it is made of a material that does not allow water to pass through, and for example, resin, metal, wood, or the like may be used. The shielding means 2P may be provided in a cylindrical shape so as to cover the entire circumference of the concentrated filtration screen 140a as long as it does not interfere with the supply of the concentrated hot water F, or may be provided in a semi-cylindrical shape so as to cover the lower half of the concentrated filtration screen 140a. It may be provided in.

Further, although not shown in FIG. 13, as in the first embodiment shown in FIGS. 1 and 2, a sludge concentration meter SD1 and a sludge flow meter FM1 are provided in the front stage of the concentrating means 2, and the sludge flow meter FM1 is provided in the rear stage of the concentrating means 2. A concentrated sludge concentration meter SD2 and a concentrated sludge flow meter FM2 are provided in the center, and the measurement results are input to the control device 50 electrically connected to these, and the measurement results from the concentrated sludge concentration meter SD2 are received. The transport means 15 of the concentration means 2 so that the control device 50 has a concentration of concentrated sludge of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. The transport speed may be controlled by controlling the rotation speed of a rotation driving means (not shown) for rotating the concentrated filtration screen 140a. Alternatively, the sludge flow rate measured by the sludge flow meter FM1 and the concentrated sludge flow meter FM2 is input to the control device 50, the concentration ratio in the concentration means 2 is calculated from the flow ratio before and after the concentration means 2, and this concentration ratio is used. From the sludge concentration measured by the sludge concentration meter SD1 in the previous stage of the concentrating means 2, the concentrated sludge concentration in the latter stage of the concentrating means 2 is calculated, and this is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and further. The transport speed of the transport means 15 of the concentration means 2 is controlled by controlling the rotation speed of the rotation drive means (not shown) for rotating the concentration filtration screen 140a so as to preferably fall within the range of 8 wt% or more and 10 wt% or less. May be. When controlling the rotation speed of the rotation driving means, the rotation speed in the enrichment unit 2B and the rotation speed in the reconcentration unit 2D may be individually controlled.

In this fourth modification, the dehydrating means 3 uses, for example, the horizontal screw press in the first modification of the present embodiment shown in FIG. 10 in the same manner as the first modification of the present embodiment. Is also good.

FIG. 14 shows a fifth modification of the enrichment means 2 of the first embodiment shown in FIGS. 1 and 2, and is common to the first embodiment shown in FIGS. 1 and 2. The same part number is also assigned to. In this fifth modification, the concentrating means 2 is an elliptical plate type concentrator.

That is, the concentrating means 2 in the fifth modification has a plurality of fixed plates 16a arranged at intervals from each other and a plurality of elliptical rotating plates 16b arranged between the plurality of fixed plates 16a. The aggregated sludge C is supplied from the housing 170 provided and one end side of the housing 170, and water is separated from the aggregated sludge C by the gap between the plurality of fixed plates 16a and the plurality of elliptical rotating plates 16b. By rotating the concentrating portion 2B provided on one end side (upstream side in the supply direction of the aggregated sludge C) of the housing 170 and the plurality of elliptical rotating plates 16b, the aggregated sludge C is concentrated in the housing 170. A transport means 2E for transporting from one end side to the other end side is provided. In the concentration unit 2B, the aggregated sludge C is concentrated to a concentration of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less to obtain concentrated sludge D.

In the concentrating means 2 in the fifth modification, the concentrated hot water F is further supplied from the concentrated hot water supply means (not shown), and the other end side (downstream in the supply direction of the aggregated sludge C) from the concentrating portion 2B in the housing 170. ) Is mixed with the concentrated sludge D, the concentrated sludge D is heated, and the concentrated sludge D is further diluted. A hot water supply unit 2C is provided. As a result, in this modification, the concentrated sludge D is heated by supplying the concentrated hot water F in the hot water supply unit 2C to the aggregated sludge C (concentrated sludge D) concentrated in the concentrating unit 2B of the concentrating means 2. The protein is thermally denatured, the retained water is separated and discharged as wastewater E together with the concentrated hot water F, and at the same time, the concentrated sludge D mixed with the concentrated hot water F is diluted. The diluted concentrated sludge D is transported by the transport means 2E to the other end side (downstream in the supply direction of the aggregated sludge C) of the hot water supply unit 2C in the housing 170, while being transported to the plurality of fixing plates 16a and a plurality. Moisture is separated from the concentrated sludge D diluted by the gap between the elliptical rotating plate 16b and reconcentrated, and the concentrated sludge concentration is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt%. It is re-concentrated by the re-concentration unit 2D in the range of 10 wt% or less. Here, in the housing 170 of the concentrating means 2, the other end side (downstream side in the supply direction of the aggregated sludge C) from the hot water supply unit 2C is referred to as a reconcentration unit 2D.

Further, although not shown in FIG. 14, as in the first embodiment shown in FIGS. 1 and 2, a sludge concentration meter SD1 and a sludge flow meter FM1 are provided in front of the concentrating means 2, and a sludge flow meter FM1 is provided in the rear stage of the concentrating means 2. A concentrated sludge concentration meter SD2 and a concentrated sludge flow meter FM2 are provided in the center, and the measurement results are input to the control device 50 electrically connected to these, and the measurement results from the concentrated sludge concentration meter SD2 are received. The transport means 2E of the concentrating means 2 so that the concentrated sludge concentration falls within the range of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. The transport speed may be controlled by controlling the rotation speed of a rotation driving means (not shown) for rotating the plurality of elliptical rotating plates 16b. Alternatively, the sludge flow rate measured by the sludge flow meter FM1 and the concentrated sludge flow meter FM2 is input to the control device 50, and the concentration ratio in the concentration means 2 is calculated from the flow ratio before and after the concentration means 2, and the concentration ratio is calculated as the concentration ratio. From the sludge concentration measured by the sludge concentration meter SD1 in the front stage of the concentration means 2, the concentrated sludge concentration in the rear stage of the concentration means 2 is calculated, and this is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and further. It is desirable to control the transport speed of the transport means 2E of the concentrating means 2 and the rotation speed of the rotation drive means (not shown) for rotating the plurality of elliptical rotating plates 16b so as to be within the range of 8 wt% or more and 10 wt% or less. It may be controlled by. When controlling the rotation speed of the rotation driving means, the rotation speed in the concentrating unit 2B and the rotation speed in the reconcentrating unit 2D may be individually controlled.

In this fifth modification, the dehydrating means 3 uses, for example, the horizontal screw press in the first modification of the present embodiment shown in FIG. 10 in the same manner as the first modification of the present embodiment. Is also good.

FIG. 15 shows a sixth modification of the enrichment means 2 of the first embodiment shown in FIGS. 1 and 2, and is common to the first embodiment shown in FIGS. 1 and 2. The same part number is also assigned to. In this sixth modification, the concentrating means 2 is a centrifuge.

That is, in the concentrating means 2 in the sixth modification, a screw conveyor 190 that is rotationally driven coaxially with the rotary bowl 180 at a differential speed is provided inside the rotary bowl 180 that is rotationally driven around the axis. One end side of the screw conveyor 190 in which the organic sludge A and the polymer flocculant B supplied from one end side between the rotary bowl 180 and the screw conveyor 190 are aggregated by the centrifugal force of the rotary bowl 180 and solid-liquid separated and concentrated. The concentrating section 2B provided (upstream side in the supply direction of the organic sludge A) and the screw conveyor 190 are rotationally driven to convey the concentrated coagulated sludge C (concentrated sludge D) to the other end side in the axial direction. The transport means 2E for discharging is provided. In the concentration unit 2B, the aggregated sludge C is concentrated to a concentration of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less to obtain concentrated sludge D.

The concentrating means 2 in the sixth modification is further communicated with a hot water supply pipe 7 inserted from one end side in the axial direction of the screw shaft 20A of the screw conveyor 190, and the concentrated hot water F from a concentrated hot water supply means (not shown). Is supplied through the hot water supply pipe 7 and mixed with the concentrated sludge D located on the other end side (downstream in the supply direction of the organic sludge A) of the concentrating portion 2B in the screw conveyor 190 to heat the concentrated sludge D, and further. A hot water supply unit 2C provided on the outer peripheral portion of the screw shaft 20A so as to extend toward the other end side (downstream in the supply direction of the organic sludge A) from the concentration unit 2B for diluting the concentrated sludge D is provided. As a result, in this modification, the concentrated sludge D is heated by supplying the concentrated hot water F in the hot water supply unit 2C to the aggregated sludge C (concentrated sludge D) concentrated in the concentrating unit 2B of the concentrating means 2. The protein is thermally denatured, the retained water is separated and discharged as wastewater E together with the concentrated hot water F, and at the same time, the concentrated sludge D mixed with the concentrated hot water F is diluted. The diluted concentrated sludge D is conveyed to the other end side (downstream in the supply direction of the organic sludge A) of the hot water supply unit 2C in the rotary bowl 18 by the transport means 2E, and the diluted concentrated sludge D is transferred. It is provided with a reconcentration unit 2D provided on the other end side (downstream in the supply direction of the organic sludge A) of the hot water supply unit 2C of the screw conveyor 190, which separates solid and liquid by the centrifugal force of the rotary bowl 18 and concentrates again. .. In the reconcentration unit 2D, the diluted concentrated sludge D is reconcentrated to a concentration of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. ..

Further, although not shown in FIG. 15, as in the first embodiment shown in FIGS. 1 and 2, a sludge concentration meter SD1 and a sludge flow meter FM1 are provided in the front stage of the concentration means 2, and the rear stage of the concentration means 2 is provided. The concentrated sludge concentration meter SD2 and the concentrated sludge flow meter FM2 are provided in the above, and the measurement results are input to the control device 50 electrically connected to them, and the measurement results from the concentrated sludge concentration meter SD2 are received. The transport means 2E of the concentrating means 2 so that the concentrated sludge concentration falls within the range of 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and more preferably 8 wt% or more and 10 wt% or less. The transfer speed may be controlled by controlling the rotation speed of the rotation drive means (not shown) for rotationally driving the screw conveyor 190, and the rotation speed of the rotation drive means (not shown) for rotating the rotary bowl 18 is controlled. It may be controlled by controlling it, or it may be controlled by controlling the rotation speeds of both. Alternatively, the sludge flow rate measured by the sludge flow meter FM1 and the concentrated sludge flow meter FM2 is input to the control device 50, and the concentration ratio in the concentration means 2 is calculated from the flow ratio before and after the concentration means 2, and the concentration ratio is calculated as the concentration ratio. From the sludge concentration measured by the sludge concentration meter SD1 in the previous stage of the concentrating means 2, the concentrated sludge concentration in the latter stage of the concentrating means 2 is calculated, and this is 6 wt% or more and 12 wt% or less, preferably 7 wt% or more and 11 wt% or less, and further. The transport speed of the transport means 2E of the concentrating means 2 is controlled by controlling the rotation speed of the rotation drive means (not shown) for rotationally driving the screw conveyor 190 so as to preferably fall within the range of 8 wt% or more and 10 wt% or less. It may be controlled by controlling the rotation speed of the rotation drive means (not shown) for rotationally driving the rotary bowl 18, or may be controlled by controlling the rotation speeds of both.

In this sixth modification, the dehydration means 3 may use, for example, the vertical screw press of the present embodiment shown in FIG. 2 in the same manner as the present embodiment.

Further, in the first embodiment, the dehydrated hot water H supplied to the dehydrating means 3 is discharged as the drainage J, but as in the second embodiment of the present invention shown in the schematic diagram in FIG. The dehydrated hot water discharged from the dehydrating means 3 may be circulated and supplied to the concentrating means 2 as the circulating concentrated hot water K so as to be reused. In addition, also in this FIG. 16, the same reference numeral is arranged in the part common with FIG.

In the case of the second embodiment, the dehydrated hot water as the circulating concentrated hot water K discharged from the dehydrating means 3 also includes the separation solution discharged from the dehydrating means 3, and thus the second embodiment is used. Therefore, the insoluble solid content (SS) in the separation liquid can be captured by the concentrating means 2 to improve the SS recovery rate. Further, since the residual polymer in the separation liquid can be effectively used, the performance of the dehydration means 3 can be improved, and the temperature of the concentrated sludge D can be further increased to further improve the dehydration efficiency.

Although the embodiment of the present invention and its modification have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment and its modification, and the scope does not deviate from the gist of the present invention. Design etc. are also included.

1 Aggregation means 2 Concentrating means 2A Concentrating tank 2B Concentrating part 2C Hot water supply part 2D Re-concentrating part 2a, 11a, 14a Concentrating filtration screen 2b, 11b, 14b Filtration chamber 2E, 12 Conveying means 2c, 12a Rotating shaft 2d, 12b Screw 3 Dehydration means 4 Concentrated sludge supply channel 11 Casing 21 roll 22 Concentrated filter filter A Organic sludge B Polymer coagulant C Aggregated sludge D Concentrated sludge E, J Drainage F Concentrated hot water G Coagulant H Dehydrated hot water I Dehydrated sludge K Circulation concentrated Hot water

Claims (14)

It is a treatment facility for organic sludge equipped with a concentrating means for concentrating organic sludge containing agglomerated protein to which a flocculant is added.
The concentrating means includes a transporting means for transporting the organic sludge supplied from one end side of the concentrating means from the one end side to the other end side of the concentrating means.
A concentration unit provided on one end side of the concentration means for concentrating the organic sludge so that the concentration of the organic sludge is in the range of 6 wt% or more and 12 wt% or less.
Concentrated hot water having a temperature higher than 50 ° C. and a temperature of less than 100 ° C. is supplied from the concentrated hot water supply means to the organic sludge located on the other end side of the concentrating unit with respect to the concentrating portion to be organic. A hot water supply unit provided on the other end side of the concentrating means with respect to the concentrating unit, which is mixed with sludge, heats the organic sludge, and further dilutes the organic sludge.
A reconcentration section provided on the other end side of the concentrating means with respect to the hot water supply section, in which the concentration of the heated and diluted organic sludge is reconcentrated to 6 wt% or more and 12 wt% or less.
Organic sludge treatment equipment characterized by being equipped with. The concentration means
A concentrated filtration screen in which the organic sludge is supplied from one end side to the inside,
A filtrate chamber provided on the outer periphery of the concentrated filtration screen and
A concentration tank comprising the concentration filtration screen and the filtrate chamber and having a central axis extending vertically from one end side to the other end side of the concentration filtration screen.
The concentrated portion provided on the one end side of the concentrated filtration screen, in which water is separated by the concentrated filtration screen and the organic sludge is concentrated, and the concentrated portion .
A screw is attached to a rotation shaft along the central axis of the concentration tank, and the rotation of the rotation shaft and the screw by a rotation driving means causes the organic sludge to be discharged from the one end side of the concentration filtration screen to the other. The transport means for transporting to the end side and
The rotation shaft of the transport means has a hollow cylindrical shape, and a plurality of hot water supply ports are formed on the cylindrical wall portion of the rotation shaft, and the concentrated hot water is supplied to the hollow portion in the rotation shaft. By being supplied and ejected from the hot water supply port, it is supplied to the concentrated sludge located on the other end side of the concentrated portion in the concentrated filtration screen, mixed with the concentrated sludge, and the concentrated sludge is heated. The hot water supply unit provided on the other end side of the concentration unit in the concentration filtration screen, which further dilutes the concentrated sludge,
The reconcentrated section provided on the other end side of the hot water supply section of the concentrated filtration screen, which reconcentrates the heated and diluted concentrated sludge by the concentrated filtration screen, and the reconcentrated section .
The organic sludge treatment equipment according to claim 1, further comprising a vertical filtration / concentrator. The concentration means
A concentrated filtration screen in which the organic sludge is supplied from one end side to the inside,
The concentrated portion provided on the one end side of the concentrated filtration screen, in which water is separated by the concentrated filtration screen and the organic sludge is concentrated, and the concentrated portion .
A filtrate chamber provided on the outer periphery of the concentrated filtration screen and having a central axis extending laterally from one end side to the other end side of the concentrated filtration screen.
A screw is attached to a rotary shaft along the central axis of the filtrate chamber, and the rotary shaft and the screw are rotated by a rotary drive means to collect the organic sludge from the one end side of the concentrated filtration screen. The transport means for transporting to the end side and
The rotation shaft of the transport means has a hollow cylindrical shape, and a plurality of hot water supply ports are formed on the cylindrical wall portion of the rotation shaft, and the concentrated hot water is supplied to the hollow portion in the rotation shaft. By being supplied and ejected from the hot water supply port, it is supplied to the concentrated sludge located on the other end side of the concentrated portion of the concentrated filtration screen, mixed with the concentrated sludge, and the concentrated sludge is heated. The hot water supply unit provided on the other end side of the concentration unit in the concentration filtration screen, which further dilutes the concentrated sludge,
The reconcentration section provided on the other end side of the hot water supply section of the concentration filtration screen, which reconcentrates the heated and diluted concentrated sludge by the concentration filtration screen, and the reconcentration section .
The organic sludge treatment equipment according to claim 1, further comprising a screw type concentrator. The concentration means
The one end of the concentrated filtration unit in which the concentrated filtration filter cloth is provided with an endless concentrated filtration filter cloth wound around a plurality of rolls and travels horizontally from one end side to the other end side . The transport means for transporting the organic sludge supplied to the side from the one end side to the other end side of the concentrated filtration unit.
The concentrated section provided on one end side of the concentrated filter section, where water is separated by the concentrated filter cloth and the organic sludge is concentrated, and the concentrated section .
The concentrated hot water is supplied from the concentrated hot water supply means to the concentrated sludge located on the other end side of the concentrated filtration section from the concentrated section in the concentrated filtration section, mixed with the concentrated sludge, and the concentrated sludge is mixed. The hot water supply unit provided on the other end side of the concentrated unit in the concentrated filtration unit, which heats and further dilutes the concentrated sludge.
The reconcentrated section provided on the other end side of the hot water supply section in the concentrated filtration section, which reconcentrates the heated and diluted concentrated sludge with the concentrated filter cloth, and the reconcentrated section .
The organic sludge treatment equipment according to claim 1, further comprising a belt-type concentrator. The concentration means
A filter body having a plurality of fixed plates arranged at intervals from each other and a plurality of movable plates arranged between the plurality of adjacent fixed plates and performing an eccentric rotational movement.
A casing that accommodates the filter and the organic sludge and has a central axis extending from one end side to the other end side .
The transporting means for transporting the organic sludge supplied from the side surface on one end side of the casing to the outside of the filter toward the other end side of the casing.
The concentrator provided on the one end side of the casing, which concentrates the organic sludge transported by the transport means by the gap between the plurality of fixed plates and the plurality of movable plates.
The concentrated hot water is supplied from the central side surface of the casing to the outside of the filter body from the concentrated hot water supply means, and is mixed with the concentrated sludge located on the other end side of the concentrated portion in the casing. The hot water supply unit provided on the other end side of the concentrated unit in the casing, which heats the concentrated sludge and further dilutes the concentrated sludge.
The reconcentrated section provided on the other end side of the hot water supply section in the casing, which reconcentrates the heated and diluted concentrated sludge by the filter body, and the reconcentrated section .
The organic sludge treatment equipment according to claim 1, further comprising a multi-disc concentrator. The concentration means
A concentrated filtration screen in which the organic sludge is supplied from one end side to the inside,
The concentrated portion provided on the one end side of the concentrated filtration screen, in which water is separated by the concentrated filtration screen and the organic sludge is concentrated, and the concentrated portion .
A filtration chamber provided on the outer periphery of the concentrated filtration screen and
A casing including the concentrated filtration screen and the filtration chamber and having a central axis extending laterally from one end side to the other end side of the concentrated filtration screen.
A guide for transporting spiral sludge is provided on the inner peripheral surface of the concentrated filtration screen, and the organic sludge is transported from the one end side to the other end side of the concentrated filtration screen by rotating the concentrated filtration screen. With the above- mentioned transport means
The concentrated hot water is supplied from the concentrated hot water supply means and mixed with the concentrated sludge located on the other end side of the concentrated portion of the concentrated filtration screen to heat the concentrated sludge and further dilute the concentrated sludge. The hot water supply unit provided on the other end side of the concentration unit in the concentration filtration screen.
The reconcentration section provided on the other end side of the hot water supply section of the concentration filtration screen, which reconcentrates the heated and diluted concentrated sludge by the concentration filtration screen, and the reconcentration section .
The organic sludge treatment equipment according to claim 1, further comprising a rotary drum type concentrator. The concentration means
A housing comprising a plurality of fixing plates arranged at intervals from each other and a plurality of elliptical rotating plates arranged between the plurality of fixing plates.
The organic sludge is supplied from the one end side of the housing, and the organic sludge is concentrated by the gap between the plurality of fixing plates and the plurality of elliptical rotating plates. With the concentrated part to be
The transporting means for transporting concentrated sludge from the one end side to the other end side of the housing by rotating the plurality of elliptical rotating plates.
The concentrated hot water is supplied from the concentrated hot water supply means and mixed with the concentrated sludge located on the other end side of the concentrated portion in the housing to heat the concentrated sludge and further dilute the concentrated sludge. The hot water supply unit provided on the other end side of the concentrating unit in the housing and the hot water supply unit .
The reconcentration unit provided on the other end side of the hot water supply unit in the housing, which reconcentrates the heated and diluted concentrated sludge by the plurality of fixed plates and the plurality of elliptical rotating plates. When,
The organic sludge treatment equipment according to claim 1, further comprising an elliptical plate type concentrator. The concentration means
Inside the rotary bowl that is rotationally driven around the axis, a screw conveyor that is rotationally driven coaxially with the rotary bowl at a differential speed is provided, and the one end side in the axial direction is provided between the rotary bowl and the screw conveyor. The concentrator provided on the one end side of the screw conveyor, which solid-liquid separates and concentrates the sludge supplied from the rotary bowl by the centrifugal force of the rotary bowl, and the concentrator.
The transporting means for rotationally driving the screw conveyor to transport the concentrated sludge from the one end side of the screw conveyor to the other end side in the axial direction.
It is communicated with a hot water supply pipe inserted from the one end side of the screw shaft of the screw conveyor, and the concentrated hot water from the concentrated hot water supply means is supplied through the hot water supply pipe to be more than the concentrated portion in the screw conveyor. It is provided on the outer peripheral portion of the screw shaft so as to extend toward the other end side of the concentrated portion, which is mixed with the concentrated sludge located on the other end side, heats the concentrated sludge, and further dilutes the concentrated sludge. The hot water supply unit and
The reconcentrated section provided on the other end side of the hot water supply section of the screw conveyor, which solid-liquid separates the heated and diluted concentrated sludge by the centrifugal force of the rotating bowl and concentrates again.
The organic sludge treatment equipment according to claim 1, further comprising a centrifuge. The organic sludge treatment equipment according to any one of claims 2, 3 and 6, wherein the concentrated filtration screen provided in the hot water supply unit is provided with a shielding means. The organic sludge treatment equipment according to claim 4, wherein a shielding means is provided under the concentrated filtration unit provided in the hot water supply unit. The organic according to claim 5, wherein the filter body provided in the hot water supply unit is provided with a cylindrical shielding means in which the fixed plate and the movable plate are integrally formed. Treatment equipment for sex sludge. A concentrated sludge densitometer is further provided after the concentration means.
A control unit for controlling the concentration means so that the output value of the concentrated sludge densitometer becomes the concentration of the organic sludge is provided.
The organic sludge treatment equipment according to any one of claims 1 to 11. A sludge densitometer and a sludge flow meter are provided in front of the concentration means.
A concentrated sludge flow meter is provided after the concentration means.
Based on the output values from the sludge flow meter and the concentrated sludge flow meter, the concentration ratio in the concentration means is calculated from the flow ratio before and after the concentration means, and the concentration ratio and the above in the stage before the concentration means are calculated. A control unit is provided that calculates the concentrated sludge concentration in the subsequent stage of the concentrating means from the sludge concentration measured by the sludge concentration meter and controls the concentrating means so that the concentrated sludge concentration becomes the concentration of the organic sludge.
The organic sludge treatment equipment according to any one of claims 1 to 11. It is a method for treating organic sludge that concentrates organic sludge containing a protein that has been aggregated by adding a flocculant by a concentrating means.
The organic sludge is concentrated to a range of 6 wt% or more and 12 wt% or less by the concentrating means, and then the concentrated hot water having a temperature higher than 50 ° C. and a temperature of less than 100 ° C. is concentrated from the concentrated hot water supply means. The organic sludge is supplied to the organic sludge, mixed with the organic sludge, the organic sludge is heated, the organic sludge is further diluted, heated, and the diluted organic sludge is 6 wt% or more by the concentration means. A method for treating organic sludge, which comprises reconcentrating to 12 wt% or less.

Images