JPH11169895A - Sludge temperature adjustment method for sludge treatment and sludge temperature adjustment system therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge temp. adjustment method in sludge treatment which is capable of easily adjusting the sludge temp. in the sludge treatment at a low cost, improving sludge treatment efficiency, etc., and making the effective utilization of equipment and a sludge temp. adjustment system therefor. SOLUTION: This sludge treatment method consists in increasing the temp. of the sludge prior to fermentation by mixing bacteria with the sludge, culturing the sludge for a prescribed period to cause the fermentation and heat generation of the sludge and mixing the heated sludge with the sludge prior to the fermentation at a prescribed rate. The heated sludge is mixed when the exothermic temp. thereof is approximately maximum. The sludge temp. adjustment system has fermentation unit tanks 6 which culture the sludge mixed with the bacteria for the prescribed period to cause the fermentation and heat generation thereof, a take-out system 7 which takes the sludge heated in these fermentation unit tanks 6 out of the fermentation unit tanks 6 and a mixer 3 which mixes the sludge taken out by the take-out system 7 with the sludge prior to the fermentation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates generally to sludge (in this specification, general waste such as human waste such as human waste, garbage and meat pieces discharged from factories, and industrial waste such as sludge and animal waste). ) Is fermented by the action of bacteria to purify the sludge. In particular, in the case of sludge that is in a low temperature or frozen state in a cold region, the sludge is efficiently thawed and the fermentation of the sludge is started. The present invention relates to a sludge temperature control method and a sludge temperature control system for promptly promoting.

[0002]

2. Description of the Related Art Sludge has been conventionally treated. These treatments are roughly classified into "purification treatment" in which sludge is purified using the decomposing power of microorganisms, and "marine dumping" in which the sludge is dumped in the ocean.

As the purification treatment, a purification treatment using microorganisms in nature and a purification treatment using microorganisms added intentionally have been proposed.

As an example of treatment using microorganisms in nature, there is a method in which sludge is buried in the ground and purified by natural fermentation and decomposition by microorganisms.

[0005] As a treatment using a microorganism intentionally added, a method utilizing a thermophilic bacterium has been proposed. Thermophiles grow at temperatures higher than the temperature range at which normal room temperature microorganisms grow, and they not only degrade organic matter, but also expose pathogens and harmful parasite eggs in sludge to high temperatures. Can be inactivated.

As a specific process, fermentation is initiated by bacteria, fungi and actinomycetes which grow at a relatively low temperature among various microorganisms inhabiting the sludge. At the same time, the cells rapidly proliferate, and at the same time, the temperature rises to 30 to 60 ° C. due to the heat of decomposition of organic substances. At this time, yeasts, molds, nitric acid bacteria, etc., which are sensitive to temperature, die. When the temperature rises, the thermophile added intentionally begins to proliferate, and the fermentation heat further increases, inactivating most of pathogenic bacteria, diseased eggs, harmful insect eggs, viruses, and weed seeds, and is harmless to humans and animals. It becomes something. By using not only normal thermophiles but also thermophiles with particularly high thermophilicity such as biocolonies and bioheats (both manufactured by Biospecial Co., Ltd.) It is possible to raise and ferment. By using thermophiles in this way, fermentation at higher temperatures becomes possible, and therefore the treatment time can be significantly reduced as compared to natural fermentation, and the purification and stabilization of sludge can be further enhanced. There is such a merit.

[0007] There is also a method using phototrophic bacteria as microorganisms. Specifically, a product in which phototrophic bacteria are immobilized on a carrier is added to the target (Japanese Patent Laid-Open No. 5-111694).
And an apparatus for processing an object by mixing the bacteria immobilized on a carrier into a pipe-shaped processing tube device (Japanese Patent Laid-Open No. Hei 8-224592). Here, “phototrophic bacteria” generally refer to photosynthetic bacteria (Photosynthet bacteria).
Bacteria called "ic bacteria", "Be
rgey's Manual of Determinative Bacteriology8th edi
(1974), according to the classification established in Phototrophic bacteria.

[0008] Specifically, there is no particular limitation, and Rhodospirilliaceae including Rhodospirillum, Rhodopseudomonas, and Rhodomicrobium; Chromatiaceae including chromatium; Chlorobiaceae including Chlorbium; These can be used alone or in combination of two or more.

The phototrophic bacterium alone is preyed by predators in the treatment tank, and it is necessary to replenish the phototrophic bacterium during the treatment in order to maintain the treatment efficiency at a predetermined level. As an embodiment, a "carrier" for immobilizing the phototrophic bacterium therein can be used by adding it at a predetermined ratio to the phototrophic bacterium. As such a "carrier", porous particles are preferable in terms of a high fixation rate of phototrophic bacteria, and more specifically, perlite, vermiculite, diatomaceous earth, activated carbon, and porous ceramics are preferable. In addition to the porous particles, a polyvinyl tube filled with a carrier containing immobilized phototrophic bacteria or a hydrogel carrier such as sodium alginate and / or calcium alginate can also be used as a preferred carrier.

[0010]

However, among the above-mentioned conventional purification treatments, the treatment using microorganisms in nature requires a long time to be purified and has a strong fermentation odor. There is also the fact that modern urban housing is scarce on the soil. The purification efficiency of human waste and feces other than garbage is not yet sufficient.

[0011] Further, in processing by ocean dumping, it has been determined that the ocean dumping will be completely prohibited soon, and there is a strong demand for establishment of a processing method that can be replaced with this processing.

[0012] Here, treatment utilizing intentionally added microorganisms is considered promising as a new purification treatment method without the above-mentioned problems, but as described above, although the basic principle has been established, the purification method has been established. A system and device for efficiently and continuously performing the processing has not been proposed yet.
It has not been put to practical use. Therefore, there has been a keen need to establish a system for efficiently realizing treatment using microorganisms generated intentionally.

In particular, when the sludge temperature is low or in a frozen state in a cold region, fermentation by the above-mentioned bacteria is slow, and it takes a long time before composting, so that the efficiency of the entire sludge treatment is likely to be reduced. . Therefore, there is a demand that the temperature of the sludge can be arbitrarily adjusted to improve the sludge treatment efficiency. However, heating the sludge itself with a heater or the like is inefficient, requiring a long time and increasing costs.

The present invention has been made in view of such problems in the conventional sludge treatment, and enables the sludge temperature in the sludge treatment to be adjusted easily and at low cost, thereby improving the sludge treatment efficiency and the like. An object of the present invention is to provide a sludge temperature control method and a sludge temperature control system in sludge treatment that can also effectively utilize equipment.

[0015]

In order to achieve this object, the present invention according to claim 1 provides a method for controlling sludge temperature in sludge treatment, wherein predetermined sludge is mixed with sludge to form a bacteria-mixed sludge. The fermented sludge is fermented by curing the mixed sludge for a predetermined period to generate heat, and the heated sludge is mixed at a predetermined ratio with the sludge before fermentation as a temperature adjusting material to raise the temperature of the sludge before fermentation. It is configured to have a feature.

Further, the present invention according to claim 2 is characterized in that, in the present invention according to claim 1, the above-mentioned generated sludge is mixed at a time when the heat generation temperature thereof is substantially the highest.

The present invention according to claim 3 is the present invention according to claim 1 or 2, wherein the fermented contents which have been cured and fermented for a predetermined period are used as a return material for the sludge before fermentation. By adjusting the water content of the sludge before the fermentation.

According to a fourth aspect of the present invention, there is provided the fermentation unit tank for fermenting the mixed sludge obtained by mixing a predetermined bacterium with the sludge according to the third aspect of the present invention. A step of feeding the mixed bacterial sludge to be charged, a first transporting step of sequentially transporting the fermented unit tank in order to cure the mixed bacterial sludge introduced into the fermentation unit tank for a predetermined period and generate heat at a predetermined temperature, and A first extraction step of extracting a predetermined amount of the fermented contents heated to a predetermined temperature through the transfer step, and sequentially transporting the fermentation unit tank in order to cure the fermented contents after the removal for a predetermined period and finish fermentation. A second transporting step to be performed, a second extracting step of extracting a predetermined amount of fermented contents that have been fermented through the second transporting step, and a predetermined amount of fermented contents extracted in the first extracting step And on A fermented pre contents of a predetermined amount taken out by the second extraction step, is configured as characterized in that it comprises a mixing step of mixing with a predetermined amount of new sludge.

The present invention according to claim 5 is characterized in that, in the present invention according to claim 4, the exothermic temperature of the contents during fermentation in the first extraction step is in the range of 80 to 130 ° C. ing.

The present invention according to claim 6 is the invention according to claim 4, wherein the fermented contents removed in the first removal step, the fermented contents removed in the second removal step, The new sludge and the new sludge are mixed substantially equally.

According to a seventh aspect of the present invention, there is provided a sludge temperature control system for sludge treatment, wherein the sludge mixed with bacteria is fermented by curing the sludge for a predetermined period to generate heat, and the fermentation unit tank includes: The system is characterized by comprising a take-out system for taking out the heated sludge from the fermentation unit tank and a mixer for mixing the sludge taken out by the take-out system with the sludge before fermentation.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a sludge temperature control method and a sludge temperature control system according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing the overall configuration of a sludge treatment facility A to which the present temperature control method and the present temperature control system are applied. FIG. 2 shows the change in sludge temperature in the present temperature control method and the change in sludge temperature in the conventional method. FIG.

FIG. 1 is a plan view showing the entire configuration of a sludge treatment facility to which the present method and the present system are applied, FIG. 2 is an enlarged view of a main part, and FIG. FIG. 4 is an enlarged perspective view showing members mainly related to fermentation of a fermentation unit tank used in the present system, and FIG. 5 is a view mainly showing contents of a fermentation unit tank used in the present system. FIG. 6 is an enlarged perspective view showing members related to discharge of articles, and FIG. 6 is an enlarged perspective view showing one embodiment of a conveyor for moving a fermentation unit tank used in the present system. FIGS. 7A and 7B are diagrams conceptually showing the take-out operation of the take-out system in the present system. FIG. 7A is a plan view in a state where the fermentation unit tank is arranged on a conveyor near the take-out position, and FIG. Is a side view in that state. FIG. 8 is a diagram conceptually showing an unloading operation of the unloading system in the present system. FIG. 8A is a plan view in a state where the fermentation unit tank is arranged on a conveyor closest to the classification device, (b) is a side view in that state. FIGS. 9A and 9B are diagrams conceptually showing a take-out operation of the take-out system in the present system. FIG. 9A is a plan view in a state where the fermentation unit tank is inclined, and FIG. 9B is a side view in that state. It is.

In the present invention, any of the thermophilic bacteria or phototrophic bacteria described above may be used alone or in combination. In addition, since only the above-mentioned bacteria are eaten by the predatory bacteria in the treatment tank and cause a decrease in treatment efficiency, preferably, a carrier for fixing the above bacteria therein, such as perlite, vermiculite, diatomaceous earth, activated carbon, and porous ceramics And the like can be used by adding to the bacteria at a predetermined ratio. In this embodiment, an example using thermophilic bacteria is shown.

First, an outline of the sludge treatment facility A to which the present method and the present system are applied will be described, and then the present method and the present system will be described in detail.

As shown in FIG. 1, the sludge treatment facility A is provided with a unit stop B for treating sludge and a carry-in / out entrance C where the truck 1 enters. The sludge treatment facility A is constructed in a building (not shown), and the deodorization facility D provided in the building reliably prevents the odor of the sludge treatment facility A from leaking to the outside. The sludge treatment facility A constitutes the present system.

The sludge conveyed to the carry-in / out entrance C is introduced into the sludge receiving device 2 and transferred to the mixer 3 where the return material to be described later is mixed therein. The sludge is sequentially transferred to the bacteria mixing device 4 and the thermophilic bacteria are mixed in the bacteria mixing device 4 (the sludge mixed with the thermophilic bacteria in the bacteria mixing device 4 is called a bacteria-mixed sludge). And so on).

Next, the bacteria-mixed sludge is transferred to the fermentation unit tank 6 of the unit stop B via the belt conveyor. The fermentation unit tank 6 is parked at the unit stop B for a predetermined number of days of curing, during which sludge is fermented by the action of thermophilic bacteria. Each fermentation unit tank 6 after the curing period is transferred to the take-out system 7, and the fermentation contents (the bacteria whose fermentation period has ended in the fermentation unit tank 6 in the fermentation unit tank 6) are supplied to the classification device 8 by the take-out system 7. The mixed sludge is referred to as fermented contents. In this classification device 8, the fermented content is returned material (the fermented content that is put into the mixer 3 is referred to as a returned material. The same applies hereinafter) and the processed product (the fermented content is shipped as compost. After that, the processed product is transferred to the processed product carrying-out device 9 and used as fertilizer for agricultural products.
On the other hand, the returned material is transferred to the mixer 3 and mixed with the newly introduced sludge. Thereafter, the same operation is continuously performed.

Note that the above-mentioned reclaimed material mainly plays a role of adjusting the moisture even when the sludge to be newly introduced has a small amount of moisture, that is, functions as a moisture regulating material, and greatly contributes to the promotion of fermentation thereafter. Further, by re-feeding the returning material, it is possible to reduce the amount of newly added inoculum. The returned material has a water content of 50% or more, preferably 5%, in a state of being mixed with the newly added sludge.
The addition amount can be adjusted so as to be about 5%, and the subsequent fermentation of sludge can be promptly promoted.

Here, the present temperature control system comprises a sludge receiving device 2, a mixer 3, a fungus mixing device 4, a take-out system 7, and a classification device 8 at the carry-in / out entrance C.
Hereinafter, this configuration and the present temperature control method using the configuration will be described in detail.

A tank 11 is mounted on the truck 1 which enters and exits the carry-in / out entrance C. The tank 11 is formed in a substantially rectangular container shape, and is capable of storing a predetermined amount of sludge therein.

The sludge receiving device 2 is formed in the shape of a hopper, and is capable of storing a predetermined amount of sludge therein through an open upper surface thereof. A discharge port (not shown) is formed in the lower edge portion of the sludge receiving device 2 on the mixer 3 side, and the internal sludge can be discharged through this discharge port.

The mixer 3 is formed in a hopper shape substantially similar to the sludge receiving device 2, and includes therein a screw (not shown) whose longitudinal direction is in the direction of the drawing X. The mixer 3 is provided with an inlet and an outlet (not shown), and the sludge discharged from the outlet of the sludge receiving device 2 and the return material discharged from the outlet of the separation device described later are used as input ports. The sludge and the return material are mixed by the rotation of an internal screw, conveyed toward the discharge port by the rotation, and discharged from the discharge port.

The bacteria mixing device 4 is configured such that a cylindrical mixing drum is rotatably supported on a base via a rotation support device at a low speed. Side plates are attached to both side surfaces of the mixture 10, one of the side plates is provided with an inlet for taking in sludge and thermophilic bacteria, and the other side plate is provided with a mixed bacterial mixture. An outlet for removing sludge is provided.

On the inner periphery of the mixing drum, a number of scooping fins each composed of a long piece of thin plate in the longitudinal direction are inclined so as to scoop up sludge at the rotation ascending side. Is formed. Then, the sludge is scooped upward by the rotation of the mixing drum. The scooping fins
The sludge is formed so as to be inclined downward from the inlet side to the outlet side in a state in which the sludge is at the rotation-up side position, and the sludge continuously rotates and sequentially moves to the outlet 18b side using the inclination. It is like that. A supply port for taking in air or thermophilic bacteria is provided in the upper part of the side plate on the intake side.

A rotary drive shaft is provided inside the mixing drum, and a number of rotary blades are mounted on the rotary drive shaft. The rotary blade is rotated at high speed by rotating the rotary drive shaft at high speed. Then, the sludge is crushed into pieces.

As shown in FIGS. 7 to 9, the take-out system 7 includes a support shaft 81 which is a part of a support mechanism located below the height of the conveyor 51 and a cylinder 82 which is a pressing means as a rotating means. . The conveyor 51 closest to the take-out position among the plurality of conveyors 51 shown in FIGS.
The fermentation unit tank 6 on A is transported on the conveyor 51 to the vicinity of the classification device 8.

The bearing shaft 81 includes a classification device 8 and the classification device 8.
, And is disposed slightly lower than the height corresponding to the bearing 97 (see FIG. 4) of the fermentation unit tank 6 conveyed on the conveyor 51A.

The cylinder 82 is disposed below the position of the conveyor 51A, and through a through hole (not shown) provided near the center of the bottom plate 41 of the conveyor 51A, the fermentation unit tank 6
By raising and lowering the end part, the fermentation unit tank 6 is tilted toward the classification device 8 and cured for a predetermined period to ferment the mixed sludge by fungi. It is to take out.

Note that the take-out system 7 is
At the position A (the position closest to the take-out position), a roller that rotates on its own surface is provided on its upper surface, and a take-out conveyor (not shown) that carries the fermentation unit tank 6 by rotating the roller in the Y direction is separately provided. A configuration may be adopted. In this case, the entire end of the take-out conveyor including the fermentation unit tank 6 is inclined toward the classification device 8 by raising and lowering the end of the take-out conveyor up and down by the cylinder 82 disposed below the fermenter. Inside contents can be taken out.

As shown in FIGS. 7 to 9, the classifying device 8
The fermentation unit 6 is disposed in a pit 83 dug down in the ground, and thereby has a substantially rectangular container-shaped receiving tank 84 disposed below the opening of the fermentation unit tank 6, and a sieve disposed immediately below the receiving tank 84. And a dividing device 85. The receiving tank 84 ferments the mixed sludge by curing the fermentation unit tank 6 taken out by the take-out system 7 for a predetermined period of time to receive the fermentation contents having the highest heat generation temperature, and It has at least the same capacity as the fermentation unit tank 6. This receiving tank 84
Is open, and the contents received in the receiving tank 84 are immediately put into the sieving device 85.

The sieving device 85 is used to classify the fermented contents into two types: small particles having a predetermined diameter or less and remaining materials having a predetermined diameter or more. Although it has a mesh portion (not shown) of a mesh diameter corresponding to, in the present invention, all the contents during fermentation received by closing the mesh of the mesh portion are left on the mesh portion, and a predetermined amount is It is transported to the mixer 3 side. In other words, by mixing the contents having a high exothermic temperature during fermentation with new sludge in this way, especially for sludge in low temperature or frozen state in a cold region, the low temperature or frozen state is efficiently released, and the fermentation starts. Can be promptly promoted.

Further, assuming that the mesh has a mesh diameter corresponding to a predetermined diameter, the fermented contents are classified into small particles having a predetermined diameter or less and remaining materials having a predetermined diameter or more, and passing through the mesh. The small particles having a diameter equal to or smaller than the predetermined diameter are transferred to the processing product unloading device 9 as a processing product, and the remaining material remaining on the net portion is used as a returning material together with the contents during fermentation as a predetermined amount returning material to the mixer 3 side. Can also be transferred to By mixing the fermented contents with the new sludge at a predetermined ratio together with the contents during fermentation in this way, the water content of the sludge can be adjusted to a predetermined amount, and the subsequent fermentation can be promoted. . Preferred water content is 50% or more,
More preferably, it is about 55%.

Next, the installation device of the unit stop B will be described in detail. In the unit stop B, a plurality of fermentation unit tanks 6 and a moving system 50 for moving the fermentation unit tanks 6 to predetermined positions in the unit stop B are provided.

The fermentation unit tank 6 is formed as an airtight container that isolates the inside from the external environment during the fermentation process. Further, on the upper surface of the fermentation unit tank 6, a rectangular lid 37 substantially corresponding to the planar shape of the fermentation unit tank 6 is provided, and the upper surface of the fermentation unit tank 6 is almost completely covered by the lid 37. Have been done. Therefore, the steam generated in the fermentation unit tank 6 cannot flow outside.

The inside of the fermentation unit tank 6 has the structure shown in FIG.
As shown in the figure, the heat retaining pipe 3 for circulating hot water to regulate the internal temperature is mainly used as a member related to fermentation.
2. An air supply pipe 34 is provided for uniformly feeding air from the bottom of the fermentation unit tank 6 to promote the fermentation treatment of sludge and bacteria. Furthermore, the fermentation unit tank 6 irradiates light desired by the phototrophic bacterium when a phototrophic bacterium is used instead of or together with the thermophilic bacterium, for discharging steam to the outside. The lighting device 35 is installed. A sensor 36 for grasping the state of the temperature and internal pressure inside the fermentation unit 6 from the start stage to the end stage of the fermentation process and outputting the same to an external processing device is attached to the side surface of the fermentation unit 6. ing.

As shown in FIG. 3, the fermentation unit tank 6 is mainly provided with a member for discharging the contents, and a lid 90 is provided on one of both wide side surfaces thereof. The lid 90 forms a substantially rectangular opening (not shown) having a width substantially corresponding to the longitudinal width of the fermentation unit tank 6 and a height of about half of the fermentation unit tank 6 on the side surface of the fermentation unit tank 6. Outside the opening, a cover plate 91 having substantially the same shape as the opening is provided, and the fermentation unit tank 6 is connected to the cover plate 91 via a hinge 92 provided at an upper portion thereof.
The opening can be freely closed by the cover plate 91 by being attached to the opening and closing freely.

At both ends in the longitudinal direction of the lid plate 91, lid stoppers 93 for keeping the lid plate 91 closed are provided. The lid stopper 93 is formed by connecting the urging plate 94 and the opening / closing plate 95 substantially integrally at a predetermined angle via a rotating longitudinal axis 96 provided therebetween. The urging plate 9 of the lid stopper 93
Reference numeral 4 denotes a cover plate 91 which is urged toward the fermentation unit tank 6 by a spring (not shown).
At 1, the opening of the fermentation unit tank 6 is closed. Further, the opening / closing plate 95 of the lid stopper 93 projects slightly laterally from the fermentation unit tank 6, and is pressed by a pressing rod described later to rotate the urging plate 94, thereby opening the opening of the fermentation unit tank 6. It is assumed that.

The fermentation unit tank 6 has a lid 90.
A bearing 97, which is a part of a support mechanism, is provided along the longitudinal direction of the fermentation unit tank 6 below. This bearing 9
7 receives a bearing shaft 81 described later in a groove inside thereof,
The fermentation unit tank 6 is rotatable about the bearing shaft 81. That is, in this embodiment, the bearing mechanism is a bearing 97
And a bearing shaft 81.

A moving system 50 for moving the fermentation unit tank 6 to a predetermined position includes a plurality of conveyors 51, a truck 52 and a truck rail 53.

The conveyor 51 has a fermentation unit tank 6 as shown in FIG.
2 and is arranged at the lower part of each of almost all of the fermentation unit tanks 6 shown in FIGS. 1 and 2.

As shown in FIG. 6, this conveyor device 51 is entirely formed by a frame, and a longitudinal plate on which a fixed number of rollers 54 are attached so as to sandwich the rollers 54 at both left and right ends in the longitudinal direction. In the center, a pair of chain conveyors is provided in the center of the chain 47. The chain conveyor has a pair of gears 47 attached to the front and rear.
The bridge is fixed.

The push plate 48 rotates the shaft 42 by driving a motor 43 installed at the center of the conveyor device 51, and the chain 45 rotates freely forward and reverse via a gear 47 attached to the shaft 42. It rotates with it. Thus, the fermentation unit tank 6 placed on the conveyor device 51 can be moved in a direction perpendicular to the longitudinal direction of the conveyor device 51. Therefore, in the sludge treatment system of the present invention in which a plurality of conveyor devices are arranged, the conveyors 51 adjacent to each other in the Y direction are provided.
The fermentation unit tank 6 can be moved between them.

In order to fix the fermentation unit tank 6 on the conveyor device 51 and load and transport it on a truck, the conveyor device 51 has a fixing device 55 in front and rear between the left and right rollers 54 and the chain conveyor. Has been established.

A screw member 68 is attached to the inside of the fixing device 55, and the fixing member 65 and the fixing plate 6 are attached to the screw member.
Nuts 67 are attached from both sides so as to sandwich 5.
Thereby, the position of the fixing plate 65 can be finely adjusted by loosening the nut 67, moving the fixing plate 65 and tightening the nut 67 at an appropriate position, and even if the fermentation unit tank 6 is slightly shifted on the conveyor device 51. It is possible to securely fix.

The fermentation unit tank 6 is fixed by placing the fermentation unit tank 6 on a conveyor device 51,
The fixing plate 65 is pulled out from the fixing device 55 provided in the conveyor device 51 and fastened to fixing nuts 66 attached to the left and right sides of both sides of the fermentation unit tank 6.

The conveyor 51 is disposed on a base 60 connected to the processing plant in advance, and the conveyor 51 installed nearest and farthest from the unloading site C is the same as that shown in FIGS.
It is installed on a self-propelled trolley 52 mounted on a trolley rail 53 arranged along the direction. And this trolley 52
The fermentation unit 6 can be moved in the X direction by causing the fermentation unit 6 to move in the X direction along the bogie rail 53.

As described above, the fermentation unit tank 6 is moved in the Y direction by the conveyor 51 and the
The fermentation unit tank 6 can be moved to an arbitrary place in the unit stop B by combining these movements in the Y direction and the X direction.

Further, by constituting the moving system 50 by the conveyor 51 and the carriage 52, even if the mixing ratio of sludge and bacteria in the fermentation unit tank 6 and the total weight are increased or decreased, the fermentation unit tank 6 can be used. When the fermentation temperature of the bacteria-mixed sludge becomes the highest, the fermentation unit tank 6 is moved to the conveyor 5.
1A.

Next, the change in the degree of fermentation will be described with reference to FIG. FIG. 3 shows a change in sludge temperature in the sludge temperature control method of the present invention together with a change in sludge temperature in the conventional method.

The composition of sludge is generally about 30% solids and about 70% water. Therefore, in cold regions such as northern countries, most of the water becomes low temperature or freezes.

On the other hand, in order for the thermophilic bacteria to be uniformly mixed and for the fermentation to start smoothly, the temperature of the sludge to be treated is 20 to
It is considered that about 35 ° C. (about human skin) is required.
Therefore, when the sludge is too low in temperature, even if the thermophilic bacteria are uniformly mixed, it takes a considerable period of time to reach a predetermined fermentation degree α, that is, to substantially start fermentation (FIG. 3). ), Resulting in a decrease in processing efficiency. Further, when the sludge is in a frozen state, a considerable load is applied to the pulverizing section of the bacteria mixing apparatus at the time of mixing the bacteria, which may affect the operating life of the apparatus.

On the other hand, in the present invention, one or more fermentation unit tanks that have been cured for a predetermined number of days are extracted, and the fermentation contents in the fermentation unit tanks are transferred to the sludge receiving device 2.
The new sludge is mixed with the new sludge to eliminate the low temperature or frozen state of the new sludge, thereby shortening the time required to reach a predetermined fermentation degree. The contents during fermentation in one or more fermentation unit tanks that have been cured for a predetermined number of days in this way, particularly the contents during fermentation that has become approximately the highest temperature of about 80 to 130 ° C. by fermentation, Or, when mixed with new sludge in a frozen state, the low temperature or frozen state of the new sludge can be immediately released, and the fermentation degree reaches a predetermined fermentation degree α, and the period until fermentation substantially starts is reduced. (See FIG. 3), so that it is suitable for sludge purification processing in cold regions such as northern countries without requiring separate heating of sludge and the like, and effective utilization of facilities can be achieved.

In a preferred embodiment, the fermented contents as the return material are also contained at a predetermined ratio together with the contents during fermentation, in particular, the contents during fermentation, the fermented contents, and the new sludge are substantially each. It is desirable to mix them evenly. By setting such a mixing ratio, the water after mixing can be adjusted to about 55%, which is a water amount suitable for promoting fermentation.

The removal of the contents during fermentation will be described. In FIG. 1, a predetermined number of fermentation unit tanks 6 are provided in four rows of Pa, Pb, Pc, and Pd rows along the Y direction. I do.

The bacteria-mixed sludge discharged from the bacteria-mixing device 4 is first put into the fermentation unit tank 6 on the moving carriage 52, and then moved to the position Pa1. Then, Pa2 and Pa are sequentially passed through the conveyor 51 to perform curing for a predetermined period.
.., Pan, and the fermentation unit tank 6 that has reached Pan is moved to the position of Pbn via the moving carriage 52. Further, the fermentation unit tank at the position of Pbn is successively connected to Pbn-1 and Pbn via the conveyor 51 in the same manner as described above.
-2, ..., Pb2, Pb1. Next, the fermentation unit tank 6 that has reached Pb1 is moved to the position of Pc1 via the movable cart 52. Similarly, Pc2, Pc3,..., Pcn, Pdn, Pdn-1,.
・ Pd2 and Pd1 are moved to form a long-term traveling course including the short-term traveling course.

Here, the fermentation unit tank 6 into which the bacteria-mixed sludge has been introduced is moved from the position of Pa1 to Pa2,.
n, Pbn, Pbn-1, Pbn-2,..., Pb1 via Pb2
The number of days to reach the position of 1 is assumed to be one day, and Pc1,
Pc2, ..., Pcn, Pdn, Pdn-1, Pdn-2, ...,
The number of days to reach the position of Pd1 via Pd2 is one day.

In this embodiment, it is assumed that 400 fermentation sludges are stored in the fermentation unit tank 6 of Pa1. Here, when one day has passed since the start of curing and the P400 reached Pb1, 100 of the 400 were taken out as contents during fermentation, and further reached one day after reaching Pd1.
The fermented contents of 00 are taken out as products by the take-out system 7 and the sorting device 8, and 100 are taken out as products by the treated product carry-out device 9, and the remaining 200 is put into the mixer 3 again as return material. That is, the contents during fermentation are extracted 100 per day, and when the extracted fermentation unit tank reaches Pd1, another 100 contents during fermentation in the next fermentation unit tank 6 are taken out. When the 200 fermented contents, 200 fermented contents, and 200 new sludge thus taken out are mixed in the mixer 3, the total water content is desirably about 55% at the next curing. Adjusted to the quantity.

[0070]

As described above, according to the present invention as set forth in claims 1, 2 and 7, sludge treatment is particularly efficient for low-temperature or frozen state sludge in a cold region. , The rise of sludge fermentation can be promptly promoted, and separate heating of sludge is not required, so that the equipment can be effectively used.

According to the present invention described in claims 3 to 6, since the water content of the new sludge is further adjusted, the subsequent fermentation can be promoted.

[Brief description of the drawings]

FIG. 1 is a plan view showing an entire configuration of a sludge treatment facility to which the present method and the present system are applied.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a diagram showing a change in sludge temperature in the present method together with a change in sludge temperature in a conventional method.

FIG. 4 is an enlarged perspective view showing members mainly related to fermentation of a fermentation unit tank used in the present system.

FIG. 5 is an enlarged perspective view mainly showing members related to discharge of contents of a fermentation unit tank used in the present system.

FIG. 6 is an enlarged perspective view showing one embodiment of a conveyor for moving a fermentation unit tank used in the present system.

FIG. 7 is a view conceptually showing the removal operation of the removal system in the present system, where (a) is a plan view in a state where the fermentation unit tank is arranged on a conveyor near the removal position, and (b). Is a side view in that state.

FIG. 8 is a view conceptually showing an unloading operation of the unloading system in the present system, in which (a) is a plan view in a state where the fermentation unit tank is arranged on a conveyor closest to the classification device; (b) is a side view in that state.

FIGS. 9A and 9B are diagrams conceptually showing an extraction operation of the extraction system in the present system, wherein FIG. 9A is a plan view in a state where the fermentation unit tank is inclined, and FIG. 9B is a side view in that state. It is.

[Explanation of symbols]

 Reference Signs List A Sludge treatment facility B Unit stop C Loading and unloading entrance D Deodorizing equipment 1 Truck 2 Sludge receiving device 3 Mixer 4 Bacteria mixing device 6 Fermentation unit tank 7 Extraction system 8 Classification device 9 Treated product unloading device 32 Insulation pipe 33 Steam discharge pipe 34 Air supply tube 35 Lighting device 36 Sensor 37 Closure 42 Shaft 43 Motor 45 Chain 47 Gear 48 Push plate 50 Moving system 51 Conveyor 52 Truck 53 Truck rail 54 Roller 55 Fixing device 55a Groove 56 Wire 57 Hook 60 Base 65 Fixing plate 66 Nut 67 Fixing nut 68 Screw member 81 Bearing shaft 82 Air cylinder 83 Pit 84 Receiving tank 85 Sieving device 90 Lid section 91 Lid plate 92 Hinge 93 Lid stopper 94 Energizing plate 95 Opening / closing plate 96 Rotating longitudinal axis 97 Bearing

Claims (7)

[Claims] 1. A method for controlling sludge temperature in sludge treatment, comprising mixing sludge with predetermined bacteria to form a fungus-mixed sludge, curing the fungus-mixed sludge for a predetermined period of time, causing fermentation, and generating heat. The temperature of sludge before fermentation is increased by mixing at a predetermined ratio with the above-mentioned sludge before fermentation as a temperature adjusting material, thereby controlling the sludge temperature in sludge treatment. 2. The method for controlling sludge temperature according to claim 1, wherein the exothermic sludge is mixed at a time when the heat generation temperature is substantially maximum. 3. The method for controlling sludge temperature according to claim 1, wherein the fermented contents which have been cured for a predetermined period and fermented are completed are mixed as a return material with the sludge before fermentation at a predetermined ratio. A method for adjusting the sludge temperature in the sludge treatment, wherein the water content of the sludge before the fermentation is adjusted. 4. The method of controlling the temperature of sludge according to claim 3, wherein the bacteria-mixed sludge in which a predetermined bacterium is mixed with the sludge is introduced into a fermentation unit tank for fermenting the bacteria-mixed sludge. A first transporting step of sequentially transporting the fermentation unit tank in order to cure the bacteria-mixed sludge put into the fermentation unit tank for a predetermined period and generate heat to a predetermined temperature, and a predetermined temperature through the first transporting step. A first withdrawal step of taking out a predetermined amount of fermented contents during heating, and a second carrying step of sequentially carrying the fermentation unit tank in order to cure the taken-out fermented contents for a prescribed period and finish fermentation. A second extraction step of extracting a predetermined amount of fermented contents that have undergone fermentation through the second transport step; a predetermined amount of fermented contents extracted in the first extraction step and the second extraction step Sludge temperature control method in a sludge processing, wherein the predetermined amount of fermented pre contents taken, a mixing step of mixing with a predetermined amount of new sludge, to become equipped with Te. 5. The sludge temperature controlling method according to claim 4, wherein the exothermic temperature of the contents during fermentation in the first extraction step is 8 or less.
A method for controlling sludge temperature in sludge treatment, wherein the temperature is in the range of 0 to 130 ° C. 6. The sludge temperature controlling method according to claim 4, wherein the fermented contents taken out in the first taking out step, the fermented contents taken out in the second taking out step, and the new sludge are respectively A method for controlling sludge temperature in sludge treatment, wherein the sludge is mixed substantially uniformly. 7. A sludge temperature control system for sludge treatment, comprising: a fermentation unit tank for fermenting sludge mixed with bacteria for a predetermined period to ferment and generate heat; and fermenting the sludge heated in the fermentation unit tank. A sludge temperature control system for sludge treatment, comprising: a removal system for removing sludge from a unit tank; and a mixer for mixing the sludge removed by the removal system with the sludge before fermentation.