JP2006061861A - Apparatus and method for treating organic sludge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for treating organic sludge, the energy cost and equipment cost of which can be reduced by reducing required equipment and saving the energy to be used in a reaction and the usage of water for adjusting viscosity as far as possible, when organic sludge is converted into a flammable solid raw material and the flammable solid raw material is effectively utilized as fuel or the like, and to provide a method for treating organic sludge. <P>SOLUTION: This apparatus for treating organic sludge is constituted so that organic sludge is treated at high temperature in high pressure to produce a slurried material and the slurried material is dehydrated so that a dehydrated solid is recovered and the separated liquid is cleaned in a water treatment facility. When organic sludge is treated at high temperature in high pressure, such a batchwise reaction is performed that a fixed amount of the organic sludge is packed and reacted for a predetermined time while being heated, pressurized and agitated by blowing pressurized steam from a pressurized steam blowing means. A membrane separation unit is arranged as at least a part of the water treatment facility. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to an organic sludge treatment apparatus and treatment method in which organic sludge is slurried by high-temperature and high-pressure treatment, recovered as a combustible solid material, and effectively used as fuel or the like.

  Conventionally, as a method of treating organic sludge generated from water treatment facilities for treating sewage, human waste and various industrial wastewater, a method of incineration or landfill disposal after the sludge is concentrated and dehydrated has been generally performed. Even after concentration and dehydration of sludge, the water content is high at 75-82 wt%, so the bulk is large, and when requesting disposal to a waste contractor, the take-up cost is high and occupies much of the overall cost of wastewater treatment. This is the current situation. Furthermore, in landfill disposal, the remaining years of the industrial waste landfill site are decreasing, and the collection cost is also rising year by year. Moreover, in incineration disposal, high water content increases fuel consumption and increases energy costs. In recent years, incineration treatment itself has become difficult due to problems such as dioxins contained in exhaust gas and incineration ash. Is the situation.

  In view of the above problems, there is a method in which organic sludge is treated under high-temperature and high-pressure conditions to be liquefied or gasified for effective use as a fuel. As an example, a dehydrator for dewatering organic sludge, a press-fitting device for press-fitting the dehydrated sludge into a preheater, a reactor, and a cooler, which will be described later, and the dewatered sludge to be injected are heated by a subsequent cooler. A preheater that preheats with the heated heat medium, a reactor that heats the preheated dewatered sludge with the heat medium, reacts at a temperature of 250 ° C. or higher and a pressure equal to or higher than the water vapor pressure at this temperature, and cools the reactants with the heat medium. A cooler, an air opening device that opens the cooled reactant to atmospheric pressure, a recovery device that recovers the flammable liquid in the opened reactant, and indirectly burns the recovered flammable liquid to heat medium. There is a sludge oil making apparatus constituted by a heating furnace for heating. (For example, see Patent Document 1)

  In addition, as another example, low-grade carbonaceous materials such as various garbage and lignite are slurried, and high-temperature and high-pressure treatment is performed to separate oxygen in the carbonaceous materials as carbon dioxide and to produce a carbonaceous slurry, There is a method of effectively using carbonaceous slurry as fuel. (For example, see Patent Document 2)

As another example, sewage sludge is subjected to strong dehydration treatment, and the dewatered sludge is subjected to high-temperature and high-pressure treatment (about 150 to 340 ° C) to produce a sewage sludge slurry, which is evaporated and separated by flash evaporation and then mixed with auxiliary fuel. Then, there is a method for producing a slurry fuel whose calorific value is adjusted. (For example, see Patent Document 3)
Japanese Patent Publication No. 7-80000 JP-T 9-505878 JP-A-6-246297

  The problem to be solved is that, in the method and apparatus for converting sludge to oil described in Patent Document 1, the oil conversion reaction for generating an oily substance from the sludge has a reaction rate when attempting to react at a low temperature or pressure. There is a problem that the reaction time is slow and the reaction time is extremely long, the energy cost is increased, and the facility cost and the installation area of the facility are increased due to excessive facilities. Therefore, in order to obtain an efficient reaction rate, it is usually processed under high temperature and high pressure conditions. However, because the temperature and pressure are too high, the temperature rise energy cost, the high pressure design of the reaction tank, the preheater, the heater, etc. There is a problem that the equipment cost increases.

  Further, in the conventional method described in Patent Document 2, since it is not a reaction for generating an oily substance, the required energy is reduced, and as a method of using wastes such as various garbage and sludge as fuel, etc. Although it is an effective means, a large amount of viscosity adjusting water is required from the outside in order to make a slurry. In particular, sewage sludge and the like are supplied as dehydrated sludge and have a moisture content of approximately 78 to 82 wt% and high viscosity, resulting in high pressure loss in the supply piping and various devices, low transportation efficiency and heating. The overall heat transfer coefficient is lowered. Therefore, in order to obtain sludge having fluidity, there is a problem that the facility becomes excessive due to the necessity of a larger amount of viscosity adjusting water.

  Moreover, in the method described in the conventional patent document 3, since the dewatered sludge is processed at high temperature and high pressure as a solid material that has been further highly dehydrated, as described above, in the supply piping and various devices as compared with the fluid feed. There is a problem that the energy loss is low and the energy cost and the equipment cost are increased because the pressure loss is low, the transport efficiency is low and the overall heat transfer coefficient during heating is low.

  The present invention has been made in view of the above circumstances, and organic sludge is slurried by high-temperature and high-pressure treatment, and then recovered as a flammable solid raw material. The purpose is to provide an organic sludge treatment device and treatment method that can reduce energy and equipment costs by reducing the amount of energy and viscosity-adjusted water used for the reaction as much as possible. It is a thing.

  The gist of the present invention for achieving the above object is that, in the first invention according to claim 1, a high-temperature and high-pressure treatment apparatus for producing a slurry-like substance by subjecting organic sludge to a high-temperature and high-pressure treatment, and the slurry-like substance In the organic sludge treatment apparatus provided with at least a dehydration treatment apparatus for dewatering and recovering dehydrated solids, and a water treatment facility for purifying the separated liquid separated by the dehydration treatment apparatus, the high temperature and high pressure treatment apparatus Provided with a pressurized steam blowing means, and the high-temperature high-pressure treatment apparatus is charged with a certain amount of organic sludge and blows pressurized steam from the pressurized steam blowing means for a predetermined time while being heated, pressurized and stirred. An organic sludge treatment apparatus, which is formed as a batch reaction tank to be reacted, and a membrane separation treatment apparatus is provided in at least a part of the water treatment facility.

  The second invention according to claim 2 is an organic sludge treatment apparatus in which the dewatering treatment apparatus in the organic sludge treatment apparatus of claim 1 is a decanter centrifuge.

  A third invention according to claim 3 adjusts the moisture content of the organic sludge by mixing the organic sludge with a liquid material in the organic sludge treatment apparatus according to claim 1 or claim 2. This is an organic sludge treatment apparatus provided with a sludge mixing apparatus.

  A fourth invention according to claim 4 is a high-temperature and high-pressure treatment step in which organic sludge is subjected to high-temperature and high-pressure treatment to produce a slurry-like material, and the slurry-like material produced in the high-temperature and high-pressure treatment step is dehydrated. In the organic sludge treatment method provided with at least a dehydration treatment step for recovering dehydrated solids and a water treatment step for purifying the separated liquid separated in the dehydration treatment step, the high temperature and high pressure treatment step is constant. A batch reaction step of reacting 5 to 120 minutes at a temperature of 160 to 250 ° C. at a pressure equal to or higher than the water vapor pressure at a temperature of 160 to 250 ° C. while stirring by blowing pressurized steam from a pressurized steam blowing means into a quantity of organic sludge, A method for treating organic sludge, characterized in that a membrane separation treatment step is provided in at least a part of the treatment step, and the residual solid in the separation liquid is separated as a concentrate. A.

  In a fifth aspect of the present invention, the liquid content is mixed with the organic sludge in the organic sludge treatment method according to the fourth aspect so that the water content of the organic sludge becomes 80 to 88 wt%. It is a processing method of organic sludge to adjust to.

  According to a sixth aspect of the present invention, the liquid substance in the organic sludge treatment method according to the fourth or fifth aspect is separated by the slurry-like substance produced in the high-temperature and high-pressure treatment step and the dehydration treatment step. This is a method for treating organic sludge which is a concentrated liquid concentrated in the separated liquid and / or membrane separation treatment step.

  The seventh invention according to claim 7 is characterized in that the temperature of the slurry-like substance generated in the high-temperature and high-pressure treatment step in the method for treating organic sludge according to any one of claims 4 to 6 is 40 to 40. It is the processing method of the organic sludge which adjusts to 90 degreeC and supplies to a dehydration process process.

  Further, according to an eighth aspect of the present invention, a part of the slurry-like substance generated in the high-temperature and high-pressure treatment step in the organic sludge treatment method according to any one of the fourth to seventh aspects remains. Then, the organic sludge is processed by supplying the organic sludge to be batch-processed next and mixing it.

  According to the configuration of the first invention, in the high-temperature and high-pressure treatment in the high-temperature and high-pressure treatment apparatus, the conventionally required organic sludge preheater or heater is unnecessary, and conventionally, the sludge is supplied to the high-pressure reaction tank. A high-pressure pump was required, but because a batch-type reaction tank was used, sludge could be supplied by lowering the pressure in the reaction tank, so normal pumps could be used, simplifying the system configuration and reducing equipment costs Can be achieved. In addition, since the pressurized steam blowing means is disposed to heat, pressurize and stir, it is possible to improve the efficiency of the reaction by uniform heating and uniform stirring of sludge in the reaction tank. In particular, the combustible solid raw material obtained by treating sewage sludge as organic sludge contains a large amount of clay as a raw material for cement, and therefore can be used very effectively as a cement raw material and a calcined fuel. Further, by providing a membrane separation treatment apparatus in a part of the water treatment facility, it is possible to remove the hardly decomposable COD component generated by the high temperature and high pressure treatment and to recover the soluble organic matter.

  According to the configuration of the second invention, the slurry material generated by the high-temperature and high-pressure treatment can be efficiently dehydrated, and a cake having a low water content can be obtained. A post-processing apparatus such as a drying apparatus can be downsized, and energy costs and equipment costs can be reduced.

  According to the configuration of the third invention, it is possible to improve the fluidity of organic sludge and reduce the amount of use of viscosity-adjusted water, etc. for facilitating the supply to the reaction tank, and by improving the fluidity, it is uniform Stirring and uniform heating are performed, and the reaction efficiency can be improved.

  The configuration of the fourth invention eliminates the need for organic sludge preheating and heating processes conventionally required in high-temperature and high-pressure treatment, and also enables sludge to be supplied at normal pressure, allowing the use of ordinary pumps and reducing equipment costs. Can be achieved. Moreover, since heating, pressurizing, and stirring are performed by blowing pressurized steam, it is possible to improve the efficiency of the reaction by uniform heating and uniform stirring of sludge. Further, since the slurrying reaction can be completed in a relatively low temperature range of 160 to 250 ° C., the energy used for the reaction is reduced, and the equipment cost can be reduced.

  With the configuration of the fifth invention, a good fluid state can be obtained with the smallest possible liquid ratio, the supply to the reaction vessel is facilitated, and the fluidity is improved, whereby uniform stirring and uniform heating are performed, and the reaction is performed. Efficiency can also be increased.

  According to the configuration of the sixth invention, slurry of organic sludge is slurried with a slurry-like substance as a reaction product, a separation liquid separated by a dehydration treatment or a concentrated liquid concentrated in a membrane separation apparatus which is a part of a water treatment apparatus. Therefore, it is possible to reduce the amount of viscosity-adjusted water or the like for improving the fluidization of organic sludge and facilitating the supply to the reaction tank, and to reduce the size of the equipment.

  According to the configuration of the seventh invention, the temperature of the slurry-like substance supplied to the dehydration process has been conventionally cooled to 40 ° C. or less, so that the moisture content of the solid content after dehydration is 60 to 70 wt%, so as to reduce the moisture content It was necessary to lengthen the reaction time in the reaction tank, but by supplying the slurry-like substance to the dehydration treatment at a temperature of 40 to 90 ° C., the reaction time in the reaction tank was greatly reduced, and after the dehydration Since the moisture content of the solid content can be set to 60 wt% or less, a post-treatment device such as a subsequent cake drying device can be downsized, and energy costs and equipment costs can be reduced.

  According to the configuration of the eighth invention, the fluidization of sludge in the reaction step can be further improved, uniform stirring and uniform heating are performed, and the reaction efficiency can be increased.

  According to the embodiment of the present invention, organic sludge is slurried by high-temperature and high-pressure treatment, and then recovered as a combustible solid raw material. For the purpose of providing organic sludge treatment equipment and treatment methods that can reduce energy and equipment costs by reducing the amount of water used and viscosity adjustment water as much as possible. This was achieved by a batch reaction method in which a certain amount of organic sludge was filled in a reaction tank, and pressurized steam was blown from the pressurized steam blowing means to react for a predetermined time while heating, pressing and stirring. Further, by providing a membrane separation processing apparatus in a part of the processing equipment, it is possible to remove the hardly decomposable COD component generated by the high-temperature and high-pressure processing and recover the soluble organic matter.

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of an organic sludge treatment apparatus according to one embodiment of the present invention.
In FIG. 1, 1 is a sludge storage tank of an organic sludge receiving facility, recovering the calorie | heat amount of the slurry-like substance produced | generated in the batch-type reaction tank 4 which processes high temperature and high pressure mentioned later, and raises the temperature of sludge and makes fluidity | liquidity. It is preferable that a heat exchange means 1b is provided for improvement. 1a is a sludge discharger that supplies the stored organic sludge to a subsequent apparatus at a predetermined flow rate.

  2 is a mixture of organic sludge and a liquid substance such as a slurry substance processed and circulated in a batch reaction tank 4 described later, a separated liquid separated by a dehydrator and / or a concentrated liquid concentrated by a membrane separator. A sludge mixing device for producing a mixed sludge having a predetermined moisture content. As the sludge mixing device 2, a screw-type mixing device or the like is used, but a ribbon-type stirrer, a paddle-type stirrer, or the like is attached to the mixing tank. It is also preferred to use an apparatus.

  Reference numeral 3 denotes a mixed sludge storage tank that stores mixed sludge adjusted to a predetermined moisture content, and 3a denotes a sludge supply pump that supplies the stored mixed sludge to a batch-type reaction tank 4 described later in batches. The sludge supply pump 3a has a high fluidity of the mixed sludge to be supplied, and it is not necessary to use a high-pressure pump because the sludge supply pump 3a is supplied to the batch-type reaction tank 4 after the pressure is reduced to a low pressure state.

  4 is a batch type reaction tank of a high-temperature and high-pressure treatment apparatus that generates a slurry-like substance by blowing pressurized steam into a certain amount of mixed sludge and reacting it under high-temperature and high-pressure conditions while heating, pressurizing and stirring. (Hereinafter simply referred to as a reaction vessel), and a plurality of stages of pressurized steam blowing means 4a and 4b are provided on the upper and lower sides so as to be heated and stirred as uniformly as possible. In addition, it is preferable that the pressurized steam blowing means 4 a and 4 b have the blowing nozzles arranged uniformly at a predetermined interval with respect to the cross section of the reaction tank 4. Further, the number of stages to be arranged may be a single stage when the reaction tank is small or the like, and is appropriately set depending on the reaction tank volume.

  A cooling device 5 cools the slurry-like substance after the reaction to a predetermined temperature, and a spiral heat exchanger, a shell and tube heat exchanger, a plate heat exchanger, or the like is used. 6 is a slurry storage tank for storing a slurry-like substance, and an agitation means 6b is attached to prevent the slurry from settling and separating. 6a is a slurry supply pump for supplying the stored slurry-like substance to the subsequent dehydrator 7 at a predetermined flow rate.

  7 is a dehydrator that separates the liquid from the slurry-like substance and collects the solid, and as the dehydrator, devices such as a decanter centrifuge, a filter press, a screw press, and a belt press are used. It is preferred to use a decanter centrifuge.

  8 is a dehydrated cake storage tank for storing the dehydrated cake dehydrated and recovered by the dehydrator 7, 9 is a separation liquid storage tank for storing the separated liquid separated by the dehydrator 7, and 9a is a predetermined stored liquid. Is a separation liquid discharge pump for sending liquid to a membrane separation apparatus which is a part of the latter-stage water treatment facility.

  Reference numeral 10 denotes a membrane separation device disposed as part of a water treatment facility for purifying the separation liquid. The membrane separation device includes a microfiltration membrane device, an ultrafiltration membrane device, a nanofilter membrane device, a reverse osmosis device. Although a device such as a membrane device is used, it is preferable to use a nanofilter membrane device.

  In addition, although not shown in figure, the equipment which uses a dehydrated cake as a combustible solid raw material product is arrange | positioned in the back | latter stage of the dehydrated cake storage tank 8, As the equipment, the cake drying equipment which dries a dehydrated cake at least, and was dried A product storage tank is provided to store the dried cake, and equipment such as a heat transfer dryer, hot air dryer, microwave dryer, and vacuum dryer is used as the cake drying equipment. It is preferred to use.

  Further, as the water treatment facility, a purification treatment device such as an aerobic treatment or an anaerobic treatment for further purifying the permeate of the membrane separation device 10 is disposed. As the purification treatment device, an activated sludge treatment device, a fixed bed type, etc. Devices such as biological treatment devices, fluidized bed treatment devices, catalytic oxidation treatment devices, and upflow anaerobic treatment devices are used.

  Further, depending on the sludge, sludge having a large diameter or impurities such as fibers and hair may be contained in the sludge, and a pulverizing apparatus for crushing them is provided if necessary. As the crushing apparatus, a single-stage crusher may be provided, but a configuration in which a fine crusher is provided after crushing by a coarse crusher and crushing in two stages is preferable.

  Next, a method for treating organic sludge such as sewage sludge (hereinafter simply referred to as sludge) using the organic sludge treatment apparatus having the above configuration will be described in detail below.

  Sludge generated from the water treatment facility is received in the sludge storage tank 1. The sludge to be accepted is usually a dewatered sludge having a water content of 75 to 82 wt% obtained from the dewatering device because the dewatering device is disposed in the water treatment facility, but is not limited thereto. Moreover, the sludge received in the sludge storage tank 1 is heat-exchanged with the slurry-like substance generated in the subsequent reaction tank 4 by the heat exchange means 1b installed therein, recovering the heat amount of the slurry-like substance, and heated. The fluidity of the sludge is improved by the temperature rise due to.

  The sludge extracted from the sludge storage tank 1 by the sludge discharger 1a is supplied to the sludge mixing device 2 via the pipe L1, but as described above, the fluctuation of the moisture content of the sludge is large, and the reaction tank 4 in the latter stage Since the reaction conditions may not be stable, the sludge mixing device 2 causes the slurry-like material to be processed and circulated in the reaction tank 4, the separated liquid separated by the dehydration device 8 and / or the concentration concentrated by the membrane separation device 10. Liquids such as liquid are mixed to adjust the moisture content of the sludge. In addition, it is preferable to adjust so that the moisture content of sludge may be 80-88 wt%, and, thereby, a favorable fluid state is obtained with a small liquid ratio, and supply to the reaction tank 4 becomes easy. Moreover, since the fluidity | liquidity in the reaction tank 4 becomes large, while being able to make reaction efficiency high, it can process on the reaction tank 4 always on the stable reaction conditions. In the above, if the water content is lower than 80 wt%, there is a problem that the fluidity becomes insufficient, and if the water content is higher than 88 wt%, there is a problem that the energy cost becomes too high.

  The mixed sludge whose water content has been adjusted by the sludge mixing device 2 is stored in the mixed sludge storage tank 3 via the pipe L2, and a fixed amount of mixed sludge is supplied to the reaction tank 4 by the mixed sludge supply pump 3a. After a predetermined amount of mixed sludge is supplied to the reaction tank 4, the valve V6 is closed, and the pressure steam is blown from the pressurized steam blowing means 4a, 4b and the pipe line L25 arranged in a plurality of stages, and the temperature is being stirred. The reaction is performed at 160 to 250 ° C. at a pressure equal to or higher than the water vapor pressure at the temperature for 5 to 120 minutes. Sludge is slurried by this high-temperature and high-pressure treatment, and a slurry-like substance is generated. The pressurized steam is supplied to the pressurized steam blowing means 4a and 4b, which are connected from the pipeline L23 and the pipeline L24, respectively, via the pipeline L22, and is supplied to the pipeline L25. The flow rate of the steam is adjusted by the valve V2, the valve V3, and the valve V4 while the opening degree of the valve V1 is automatically adjusted based on an instruction from the flow controller F1.

  Sludge is uniformly heated and stirred by blowing the pressurized steam from the upper and lower stages of pressurized steam blowing means 4a, 4b and the pipe line L25. When the temperature is 160 ° C. or lower, there is a problem that the generation of the slurry-like substance is insufficient or a long-time treatment is required, and when the temperature is 250 ° C. or higher, the energy cost and the equipment of high-grade material are necessary. As a result, there is a problem that the equipment cost increases.

  After a predetermined reaction time has passed, the valve V5 and the valve V8 are opened, and the slurry-like substance generated by the high-temperature and high-pressure treatment is supplied to the heat exchanging means 1b provided in the sludge storage tank 1 via the pipe L4. Then, the slurry-like substance is cooled by exchanging heat with sludge, supplied to the tube side of the shell-and-tube type cooling device 5, and cooled to a predetermined temperature by cooling water flowing from L16 through the shell side to L17. The slurry is supplied to the slurry storage tank 6 via the pipe L5.

  In the above, extraction of the slurry-like substance from the reaction tank 4 is carried out by leaving a certain amount up to level A indicated by the alternate long and short dash line in the reaction tank 4 and supplying organic sludge to be batch-processed next for mixing treatment. Is preferred. Further, the discharge of carbon dioxide gas or the like generated by the decompression and high-temperature and high-pressure treatment in the reaction tank 4 is performed by opening the valve V7 and exhausting it from the pipe L20 to the atmosphere through a deodorizing device not shown in the drawing or one point. The valve V7a indicated by the chain line is opened and supplied to the slurry storage tank 6 from the pipe L21 via the pipe L4, or directly supplied to the slurry storage tank 6 and not shown from the pipe L19. It is performed by being discharged to the atmosphere via.

  In the slurry storage tank 6, in order to prevent sedimentation of solid substances in the slurry-like substance, the slurry-like substance is stored while being stirred by the stirring means 6b, and the stored slurry-like substance is supplied by a fixed amount from the pipe L6 by the slurry supply pump 6a. It is continuously extracted and supplied to the subsequent dewatering device 7. In addition, a part of slurry-like substance is supplied to the sludge mixing apparatus 2 via the pipe lines L15 and L12, and can also be used for the fluidity | liquidity adjustment of sludge.

  The liquid component is separated from the slurry-like substance by the dehydrating device 7 to collect a cake that is a solid content. The recovered dehydrated cake is stored in the dehydrated cake storage tank 8 via the line L8, and then illustrated from the line L9. The flammable solid raw material product supplied to a commercialization equipment such as a cake drying equipment that is not used and made into a combustible solid raw material product can be effectively used as a cement raw material and a calcined fuel. In addition, dehydration efficiency can be improved by adjusting and supplying the temperature of the slurry-like substance supplied to the dehydration apparatus 7 to 40-90 degreeC. Incidentally, when supplied at 20 ° C., the water content of the solid content after dehydration becomes 60 wt% or more, but when it is supplied at 80 ° C., it can be in the vicinity of 50 wt%.

  In addition, the separated liquid separated by the dehydrator 7 is supplied to and stored in the separated liquid storage tank 9 from the pipe L7, and is separated from the pipe L10 by a separated liquid discharge pump 9a at a predetermined flow rate in one of the subsequent water treatment facilities. The liquid is sent to the membrane separation apparatus 10 as a part.

  The separation liquid sent to the membrane separation device 10 passes through the membrane through the separation membrane and the permeation side 10b through the concentrated solution obtained by concentrating the hardly decomposable COD components and soluble organic substances in the separation solution on the non-permeation side 10a. And separated from the permeate from which high-concentration organic substances and the like have been removed. A part of the separated liquid can also be supplied to the sludge mixing device 2 through the pipelines L14 and L12 indicated by the alternate long and short dash line and used for adjusting the moisture content of the sludge. The permeate is supplied to a water treatment facility such as an activated sludge treatment apparatus (not shown) through a pipe L11, and finally the organic matter is purified and discharged. Further, the concentrated liquid is supplied to the sludge mixing device 2 through the pipe L12, and the residual organic matter is recovered while adjusting the moisture content of the sludge.

System diagram of organic sludge treatment apparatus of one embodiment of the present invention

Explanation of symbols

1: Sludge storage tank 2: Sludge mixing device 3: Mixed sludge storage tank 4: High-temperature high-pressure treatment device (batch type reaction tank)
5: Cooling device 6: Slurry storage tank 7: Dehydration apparatus 8: Dehydrated cake storage tank 9: Separation liquid storage tank 10: Membrane separation apparatus

Claims (8)

  A high-temperature and high-pressure treatment apparatus that generates a slurry-like substance by subjecting organic sludge to a high-temperature and high-pressure treatment, a dehydration treatment apparatus that dehydrates the slurry-like substance to recover dehydrated solids, and a separation separated by the dehydration treatment apparatus. In an organic sludge treatment apparatus provided with at least a water treatment facility for purifying the liquid, the high temperature and high pressure treatment apparatus is provided with pressurized steam blowing means, and the high temperature and high pressure treatment apparatus is filled with a certain amount of organic sludge. Formed as a batch-type reaction tank in which pressurized steam is blown from the pressurized steam blowing means and reacted for a predetermined time while being heated, pressurized and stirred, and a membrane separation treatment device is provided in at least a part of the water treatment facility Organic sludge treatment equipment characterized by being made.   2. The organic sludge treatment apparatus according to claim 1, wherein the dehydration treatment apparatus is a decanter centrifuge.   The organic sludge treatment apparatus according to claim 1 or 2, wherein a sludge mixing device is provided for adjusting a moisture content of the organic sludge by mixing a liquid substance with the organic sludge.   A high-temperature and high-pressure treatment step for producing a slurry-like substance by subjecting organic sludge to a high-temperature and high-pressure treatment; a dehydration treatment step for recovering a dehydrated solid by dehydrating the slurry-like substance produced in the high-temperature and high-pressure treatment step; In the organic sludge treatment method provided with at least a water treatment step for purifying the separation liquid separated in the dehydration treatment step, the high-temperature high-pressure treatment step adds a certain amount of organic sludge from the pressurized steam blowing means. This is a batch reaction step in which the reaction is performed at a temperature of 160 to 250 ° C. and a pressure equal to or higher than the water vapor pressure at a temperature of 120 to 250 ° C. while stirring by blowing pressure steam, and a membrane separation treatment step is provided in at least a part of the water treatment step. A method for treating organic sludge, wherein the solid residue in the separated liquid is separated as a concentrated liquid. The processing method of the organic sludge of Claim 4 which mixes a liquid substance with the said organic sludge, and adjusts the moisture content of the said organic sludge to be 80-88 wt%. The organic material according to claim 4 or 5, wherein the liquid material is a slurry-like substance produced in a high-temperature and high-pressure treatment process, a separated liquid separated in a dehydration treatment process and / or a concentrated liquid concentrated in a membrane separation treatment process. Treatment method of activated sludge. The processing method of the organic sludge of any one of Claims 4 thru | or 6 which adjusts the temperature of the slurry-like substance produced | generated at the said high temperature / high pressure treatment process to 40-90 degreeC, and supplies it to a dehydration treatment process. The organic substance according to any one of claims 4 to 7, wherein a part of the slurry-like substance generated in the high-temperature and high-pressure treatment step is left to be mixed and treated with organic sludge to be subsequently treated. Sludge treatment method.