JP3968369B2 - Solid-liquid separation system with decolorization function of septic tank treated water - Google Patents

Description

  The present invention relates to a solid-liquid separation system provided with a function of decoloring treatment of septic tank treated water in addition to a function of solid-liquid separation and dehydration treatment of livestock waste discharged from a barn.

  Livestock processing water (hereinafter referred to as raw water) discharged from a barn is stored in a raw water tank and then supplied to a solid-liquid separation device by a pump to separate the solids and liquids such as feces and treat each of them. Has been adopted. The solid-liquid separation system of the vibration sieve system and the inclined screen system adopted in the conventional sewage treatment apparatus by the activated sludge method is configured by arranging an inclined mesh screen in the inclined opening of the hopper-shaped sewage receiver. By supplying raw water containing manure to the top of the screen with a pump and dropping it along the mesh screen, the liquid falls from the mesh of the screen and temporarily accumulates in the filtrate tank from the hopper-shaped sewage receiver, then the aeration tank To the next processing step. On the other hand, the solid content flows along the screen and falls from the lower end of the screen to the solid content storage pitch and is deposited. In the aeration tank, aeration is performed by an aerator, and sludge in the sewage is decomposed by activated sludge microorganisms. The aeration tank is generally provided with a fixed aerator. By blowing fine bubbles into the urine sewage with this aerator, the inside of the tank is agitated at a constant flow rate to keep the dissolved oxygen concentration in the tank constant, and the activated sludge microorganisms are removed. Culture and treat sewage.

Moreover, in the conventional sewage treatment facility, the decolorization treatment is performed before the treated water is discharged into the public drainage channel. The processing solution before color removal is suspended in brown, and the suspension contains fine fibrous substances that clog the filter and cause a troublesome problem in subsequent processing. Yes. Conventional decoloring treatment involves operations such as blowing ozone, using a large amount of activated carbon, and passing through an osmotic membrane, and requires a considerable amount of ozone and activated carbon and treatment time to obtain sufficient transparency. It was. Incidentally, in the method disclosed in Patent Document 1, as shown in FIG. 6, the treated water treated by the membrane treatment unit is sucked into the filtered water tank 108 provided next to the sludge storage tank 107 adjacent to the membrane separation tank 106. The treated water that has been sucked in and sent through the transfer pipe l ₁₅ and filtered here is sent to the decolorization processing unit 150 through the transfer pipe l _16, and decolorization processing is performed to make the sewage nearly colorless and transparent. The decolorization device 150a forming the decolorization processing unit 150 sends treated water sucked from the filtration water tank 108 by the membrane supply high-pressure pump 151 to the membrane module 152 having a reverse osmosis membrane, and is washed by the chemical injection pump 154 from the chemical dissolution tank 153. The treatment water is decolorized by a reverse osmosis membrane washed with a chemical solution for use. In the figure, l ₁₇ is a permeate transfer pipe, l ₁₈ is a circulating water pipe, l ₁₉ is a concentrated water transfer pipe, and l ₂₀ is a wash water supply pipe. As described above, although a large amount of equipment is conventionally required for the decoloring process and a long time is required for the process, the sufficient effect has not been obtained.

Under such circumstances, the applicant of the present invention not only can quickly decolorize the raw water treated with livestock in the septic tank with simple equipment, but also recycle the treated water into a washing liquid, etc. A decoloring treatment method for purifying to a usable level was presented, and a patent application was filed as Japanese Patent Application No. 2004-259564. In the method for decolorizing livestock treated water of this invention, ferric sulfate and nonionic or anionic or cationic organic flocculant are added to a filtrate obtained by treating raw water that is livestock treated water in a septic tank, and reacted by stirring. And separating the solid and liquid components and removing the solid components.
And this decolorization method of livestock processing water is a brown suspension by adding a ferric sulfate and nonionic or anionic or cationic system to the filtrate obtained by treating raw water in a septic tank and stirring it to react. Since it is possible to agglomerate and separate even the fine fibrous material which is the main component of the above, it has an excellent decoloring effect. In addition, even fine fibrous substances that are the main cause of clogging of the filter can be removed, so that no troublesome problems are left in the subsequent processing. This effect can be further improved by adding a nonionic or anionic or cationic organic flocculant after adding ferric sulfate and stirring to react, followed by a two-stage reaction.

  In addition, the present applicant presents a manure solid-liquid separation device that separates solids such as feces of livestock contained in livestock sewage from liquid, and is registered as Utility Model Registration No. 3091008. This device has a significantly higher solid-liquid separation processing capacity for manure compared to conventional manure solid-liquid separation devices, can prevent clogging of the screen conveyor, and can perform solid-liquid separation processing of a large amount of manure continuously. It is an object of the present invention to provide a manure solid-liquid separator capable of reducing equipment costs and improving processing capacity. As shown in FIG. 5 is supplied to the lower position on the upstream side of the raw water stirring and aggregation tank 104 from the raw water agitation and aggregation tank 104, and a plurality of squeezing rollers 8 are provided on the upper surface of the screen conveyor 5 in the upward direction, The liquid of the manure agglomerated slurry is separated by its own weight and the pressure of the squeezing roller 8 and falls from the mesh of the screen conveyor, and the solid content falls from the downstream end of the solid liquid. Those that perform, on the return side of the screen conveyor, the cleaning brush 13, the cleaning water injector 12, the cleaning air blow device 27 is disposed.

Furthermore, the present applicant has proposed an improved system of the manure solid-liquid separator as Japanese Patent Application No. 2003-323964. This improved type is less likely to cause clogging etc. of the solid content of livestock sewage that has been agglomerated, and continuously squeezes livestock manure slurry that is being conveyed by a conveyor at a high speed, making it suitable for composting. It is possible to perform solid-liquid separation up to a high rate, and it is possible to process in large quantities with almost no maintenance, and with good treatment water with a small amount of solid foreign matter (SS) and biochemical oxygen demand (BOD) by dehydration. A livestock excreta squeezing device that can be obtained in large quantities, can reduce the amount of sewage that is returned to the raw water tank and re-dehydrated, and can drastically reduce unit treatment costs including equipment costs, and the device The animal livestock manure solid-liquid separation system using was provided.
Japanese Patent Application Laid-Open No. 2003-205298 “Treatment device for domestic animal urine sewage” released on July 22, 2003 Utility Model Registration No. 3091008 “Manure Solid-Liquid Separator” issued on January 17, 2003

  The subject of the present invention is the above-mentioned decolorization treatment method for livestock treatment water in which ferric sulfate and an organic flocculant are added to the filtrate treated in the septic tank and stirred to react to separate the colored substance as a solid component. An object of the present invention is to provide a compact system that employs the previous screen conveyor having excellent performance as a solid-liquid separator in the process of removing solids. Another object of the present invention is to provide a system that can be used not only for the decolorization process of livestock treatment water but also for the initial solid-liquid separation of feces and the like in the livestock waste disposal process.

The solid-liquid separation system having the function of decolorizing treatment water of the septic tank according to the present invention introduces a means for adding ferric sulfate to the filtrate aerated in the septic tank, and a liquid to which polyferric sulfate is added. A first reaction tank for stirring reaction, a means for adding an organic flocculant in the course of transferring the liquid treated in the first reaction tank to the second reaction tank, and a reaction treatment in the second reaction tank. Means for supplying the slurry separated into solid and liquid components to a lower position on the upstream side of the screen conveyor that is continuously driven by being inclined, and solid-liquid separation by continuously squeezing the slurry being conveyed by the conveyor And means to do.
The preferred form of the means for adding polyferric sulfate to the filtrate is a cylindrical tank partitioned by a partition plate, in which polyferric sulfate is added in the lower upstream section, and the upper downstream section The additive such as activated carbon was added.

The solid-liquid separation system having the function of decolorizing treatment water of the septic tank treated water of the present invention is provided with a plurality of squeezing rollers on the upper surface of the forward path of the screen conveyor as a means for solid-liquid separation. The liquid content of the slurry was separated by its own weight and the pressure of the squeezing roller and dropped from the mesh of the screen conveyor, and the solid content was dropped from the downstream end thereof to perform solid-liquid separation.
In the solid-liquid separation system having the function of decolorizing treatment water of the septic tank according to the present invention, the first reaction tank is additionally provided with an introduction path having means for adding an organic flocculant to the raw water from the raw urine tank. I made it.
In a different form, a means for adding an organic flocculant during transfer of the liquid treated in the first reaction tank to the second reaction tank is additionally provided.

  The solid-liquid separation system having the function of decolorizing treatment water of the septic tank according to the present invention introduces a means for adding ferric sulfate to the filtrate aerated in the septic tank, and a liquid to which polyferric sulfate is added. A first reaction tank for stirring reaction, a means for adding an organic flocculant in the course of transferring the liquid treated in the first reaction tank to the second reaction tank, and a reaction treatment in the second reaction tank. Means for supplying the slurry separated into solid and liquid components to a lower position on the upstream side of the screen conveyor that is continuously driven by being inclined, and solid-liquid separation by continuously squeezing the slurry being conveyed by the conveyor The pigment component contained in the filtrate by agglomeration with ferric sulfate, agglomeration with an organic aggregating agent, and a two-stage reaction treatment through a series of compact system configurations. Solidification can be performed effectively, and solids separated into solid and liquid can be discharged into the fermentation process, and the liquid can be discharged as it is into public wastewater, as well as water that can be reused as secondary water. .

Further, a preferred form of means for adding ferric sulfate to the filtrate is a cylindrical tank partitioned by a partition plate, in which polyferric sulfate is added in the upstream section, and activated carbon or the like is used in the downstream section. Since the additive is added, by adding activated carbon, etc. in the first stage reaction to add polyferric sulfate, not only increase the dehydration effect but also adsorb minute fibrous substances to them. The screen conveyor can be processed with a low maintenance burden without causing clogging.
Furthermore, in the solid-liquid separation system having the function of decolorizing treatment water of the septic tank of the present invention, as a means for solid-liquid separation, a plurality of squeezing rollers are provided on the upper surface of the forward path of the screen conveyor, and the ascending and conveying toward the downstream side. In addition, the liquid content of the slurry is separated by the pressure of its own weight and the squeezing roller and falls from the mesh of the screen conveyor, and the solid content is solid-liquid separated by dropping from the downstream end thereof, Since the separated solid content is dehydrated to a water content of 75 to 85%, additives such as sawdust to be used can enter the fermentation reaction with a small amount.

In the solid-liquid separation system having the function of decolorizing treatment water of the septic tank according to the present invention, the first reaction tank is additionally provided with an introduction path having means for adding an organic flocculant to the raw water from the raw urine tank. Since the first reaction tank is inclined from the first reaction tank and is supplied to a lower position on the upstream side of the screen conveyor that is continuously driven, the slurry being continuously conveyed by the conveyor is squeezed. The means for processing and solid-liquid separation can also be used for the initial solid-liquid separation of feces and the like in the livestock waste disposal process. In general, a system for processing livestock filth requires a large space, but this system can further save space.
Further, according to a different embodiment additionally provided with means for adding an organic flocculant in the course of transferring the liquid treated in the first reaction tank to the second reaction tank, the initial solidity of feces etc. in the livestock waste treatment process An optimum organic coagulant can be selected and used by a simple switching operation for liquid separation and for decolorizing the septic tank filtrate.

  An embodiment of a solid-liquid separation system having a function of decolorizing treatment water for septic tank according to the present invention will be described in detail with reference to FIGS. 1 to 4. This embodiment apparatus 1 is a system having not only a decolorization process for livestock treatment water but also a solid-liquid separation function such as initial feces in a livestock filth treatment process. As shown in FIG. 1, a first reaction tank 51 and a second reaction tank 52 are installed on a base 50, and the first reaction tank 51 has blades fixed on the inner peripheral side surface in the center. A rotating blade is installed in the section, and the liquid stored by the interaction of both blades has a function of stirring. The second reaction tank 52 is also provided with a rotating blade at the center. The first reaction tank 51 is provided with a path 53 through which the filtrate from the septic tank is introduced via a small acrylic tank 55 and a path 54 through which the raw water from the raw urine tank is introduced through the flow rate adjusting tank 56. The passage 54 is provided with an addition port 60 to which a cationic flocculant is added. As shown in FIG. 3, the acrylic small tank 55 has a transparent cylindrical shape and is partitioned vertically by a partition plate 57. In this example, a partition plate 57 having a hole in the center is used. An inlet 70 into which the filtrate of the septic tank is introduced into the bottom portion penetrates the partition plate 57 from above, and a pipe 61 to which polyferric sulfate is added is disposed. In the upper section of the partition plate 57, a pipe 64 into which an additive mixed with waste paper, a pH adjusting agent or the like in addition to activated carbon is placed, and a flowing fluid is added. The fluid treated in the first reaction tank 51 is sent to the second reaction tank 52 via the flow path 58, and an anion or nonionic flocculant addition port 62 and a cationic flocculant addition port are in the middle of this process. 63 is disposed. Further, an agglomerated slurry supply rod 59 is disposed for supplying the agglomerated slurry floating from the upper part of the second reaction tank 52 to the upstream end of the screen conveyor. The above is the configuration of the process water aggregation step.

  Next, the configuration of the solid-liquid separation process will be described. The configuration of this part is basically the same as the “domestic manure squeezing device and livestock manure solid-liquid separation system using the device” disclosed in Japanese Patent Application No. 2003-323964. As shown in FIG. 2, an endless belt-like screen conveyor 5 is stretched between a driving roll 4a and a driven roll 4b provided at both ends of a main body frame 3 supported by a plurality of columns 2, and the screen The conveyor is rotationally driven by a motor (not shown). The screen conveyor is installed in an inclined state so that the downstream side is slightly higher than the upstream side. In addition, a coagulated slurry supply rod 59, three pre-squeezing rollers 8 and a pressing roller 10 are arranged in this order from the upstream side, and the shower 12 and the rotating brush 13 are paired on the return path side. Two sets 14 are arranged at a predetermined interval, and an air nozzle group 15 for blowing pressurized air from the inside of the conveyor is arranged between the cleaning devices.

  The squeezing roller 10 is an important component that constitutes the squeezing unit, and is configured to squeeze using one squeezing roller, but is not necessarily limited to one stage, and a plurality of squeezing rollers according to the amount of processing. You may comprise in multistage using. In order to obtain an effective squeezing effect, the squeezing roller 10 desirably has a diameter of about 40 to 100 cm, and the surface thereof is preferably smooth. In this embodiment, the squeezing roller 10 is formed of a stainless steel roller having a diameter of about 70 cm, and its shaft is supported by a bearing supported by the main body frame 3 so as to be adjustable in the vertical direction so as to be freely rotatable. And with respect to this pressing roller 10, the screen conveyor 5 is on the lower outer peripheral surface of the rollers over the range of 90 ° to 180 °, more preferably 160 ° to 180 ° of the lower outer peripheral surfaces of these pressing rollers. It moves along and is provided in a positional relationship such that the solid cake being conveyed is bitten between the screen conveyor and the roller surface and squeezed into a strip shape. Therefore, a roll inlet side guide roll 16 for bending and guiding the screen conveyor 5 downward on the inlet side to the pressing roller 10 and an outlet side guide roll 17 for bending and guiding the screen conveyor on the outlet side of the pressing roller 10 are provided. Both side guide rolls are rotatably supported, and the bearings are provided on the main body frame 3 so as to be adjustable in the radial direction of the squeeze roller. The entrance side guide roll 16 is made of a solid cake of the squeeze roller 10 and the screen conveyor 5. The gap with the squeezing roller 10 is adjusted so as to be smoothly bitten between the two and fixed at the optimum position. On the other hand, as shown in FIG. 4, the outlet side guide roll 17 is provided with a spring 21 between the bearing support plate 24 of the outlet side guide roll and an appropriate bracket 20 such as a bolt provided protruding from the main body frame 3, The outlet side guide roll is urged toward the squeezing roller with a predetermined pressure to obtain the squeezing force by the screen conveyor 5. Therefore, by adjusting the spring force of the spring 21, the pressing force of the solid cake can be adjusted, and an appropriate moisture content can be maintained.

  A plurality of regulating rollers 18 and 19 are provided to prevent the screen conveyor from spreading outward when an overload acts along the lower outer peripheral surface of the squeezing roller 10. The regulation roller is also provided with an adjustable bearing on the main body frame 3 so that the maximum gap between the conveying surface of the screen conveyor 5 and the outer peripheral surface of the pressing roller can be adjusted. The pre-squeezing roller 8 plays a role of smoothing the solid cake put on the screen conveyor through the agglomerated slurry supply rod 59 to a uniform thickness by the screen conveyor and pre-squeezing lightly. It is formed smaller than that of the squeezing roller 10, and as shown in the drawing, the screen conveyor 5 is located on the outer peripheral surface of the preliminary squeezing roller 8 over a predetermined angle range and located deeper than the screen conveyor surface. You may arrange | position so that it may follow, or it may arrange | position so that it may have a substantially the same height as a screen conveyor surface, or a slight clearance gap.

  On the other hand, in the shower 12 arranged on the return path side, a plurality of nozzles are arranged at predetermined intervals in a manifold pipe arranged inside the screen conveyor so as to cross the conveyor, and pressure water is supplied from the inside of the screen conveyor. By spraying, the solid matter adhering to the screen conveyor 5 is washed and removed. Further, the rotating brush 13 disposed so as to face the shower 12 is configured by radially arranging a plurality of rods planted with hard plant fibers having long bristle legs on the rotating frame, and has a surface on which manure slurry is placed. It is designed to be scraped off. Accordingly, since the cleaning water is sprayed from the inside and the dirt is scraped and pushed from the outside by the rotating brush, the dirt is effectively removed and clogging is prevented. In addition, in this embodiment, an air nozzle group for injecting pressurized air from the inside of the conveyor by the blower 27 is arranged downstream of the rotating brush (shower), so that it remains as a water film on the inner surface of the screen conveyor. The sewage is blown off from the inside, and the water film that is likely to be clogged can be removed reliably, and clogging can be prevented more effectively.

  Below the screen conveyor 5 on the forward path side, as shown in FIG. 2, a separation water receiver 11 for receiving the separated water that has passed through the screen conveyor 5 during the forward conveyance is provided in the endless conveyor. It is stored in the separation tank 30. Further, a cleaning drain receiving rod 26 for receiving the cleaning drainage is provided below the return side of the screen conveyor 5, and the cleaning drainage is collected and collected in the cleaning drainage tank, and is then supplied to the raw water tank by a pump.

  The solid-liquid separation system having the function of decolorizing treatment water of the septic tank of the present embodiment configured as described above is first used for solid-liquid separation of feces and the like performed at the initial stage in the livestock filth treatment process. Is done. The raw water supplied from the raw water tank through the flow rate adjusting tank 56 is added with a cationic flocculant from the flocculant addition port 60 in the middle of the flow path 54 and introduced into the first reaction tank 51, and this first reaction tank. The agitation reaction is promoted by the cooperation of the fixed blade and the rotating blade, and the floc is formed. This fluid is conveyed to the second reaction tank 52 through the flow path 58, and the cationic flocculant is added again from the flocculant addition port 63 in the middle thereof. In the second reaction tank 52, the rotating blades are gently rotated to promote the formation of flocs. As the flocculant used for the first solid-liquid separation, a cationic organic flocculant is effective instead of an anion or nonionic. The formed floc is introduced into the upstream of the screen conveyor 5 through the agglomerated slurry supply rod 59. The liquid component flows down through the mesh of the screen conveyor 5, and the solid component is spread on the upper surface of the screen conveyor 5. This solid content contains a large amount of moisture and is lightly squeezed sequentially by the three preliminary squeezing rollers 8 while being conveyed by the screen conveyor 5. The squeezed water flows down through the mesh of the screen conveyor 5. Further, the solid content filtered on the downstream side of the screen conveyor 5 is tightly squeezed by the pressing roller 10 and the outlet side guide roll 17, and the squeezed water flows down through the mesh of the screen conveyor 5. The water flowing down from the mesh is provided in the endless conveyor and received by the separation water receiving tank 11, and the separated liquid is stored in the separation tank 30. This separated liquid is transferred to a septic tank and subjected to a backing treatment. The filtered solid content is dropped from the endless belt-shaped screen conveyor 5 at the portion of the driven roller 4 b at the tip, and accumulated in the solid content collection pit 35. The accumulated solid content is appropriately transferred to a fermentation facility, but since it has been dehydrated to a water content of 75 to 85%, it can enter the fermentation reaction without using a large amount of additives such as sawdust.

  Next, the inflow path to the first reaction tank 51 is switched from 54 to 53, and the operation of the solid-liquid separation system provided with the decolorization processing function of the septic tank treated water of this embodiment for the decolorization processing of the filtrate in the septic tank. explain. Filtrate in the septic tank is supplied from the filtrate inlet 70 from below the acrylic small tank 55, and polyferric sulfate is added from the input pipe 61. The fluid to which the polyferric sulfate is added is sent to the section separated by the separation plate 57, and the additive mixed with the used paper and the PH adjusting agent in addition to the activated carbon stored therein is supplied from the input pipe 64 to the fluid. It is added into the first reaction tank 51 through the introduction path 53. This mixed fluid is agitated in the first reaction tank 51, and the coagulation reaction is promoted by the cooperation of the fixed blade and the rotary blade to form a floc. At this stage, fine fiber components that are the main cause of clogging of the screen are effectively adsorbed by activated carbon, waste paper, and the like. This fluid is conveyed to the second reaction tank 52 via the flow path 58, and an anionic or cationic organic flocculant is added from the flocculant addition port 62 on the way. In the second reaction tank 52, the rotating blades are gently rotated to promote the formation of flocs. The flocculant used for decolorizing the filtrate in the septic tank is not a cationic type but an anion or a nonionic organic coagulant. However, it is preferable in view of fish toxicity during drainage. The formed floc is introduced into the upstream of the screen conveyor 5 through the agglomerated slurry supply rod 59. The liquid component flows down through the mesh of the screen conveyor 5, and the solid component is spread on the upper surface of the screen conveyor 5. This solid content contains a large amount of moisture and is lightly squeezed sequentially by the three preliminary squeezing rollers 8 while being conveyed by the screen conveyor 5. The squeezed water flows down through the mesh of the screen conveyor 5. Further, the solid content filtered on the downstream side of the screen conveyor 5 is tightly squeezed by the pressing roller 10 and the outlet side guide roll 17, and the squeezed water flows down through the mesh of the screen conveyor 5. The water flowing down from the mesh is provided in the endless conveyor and received by the separation water receiving tank 11, and the separated liquid is stored in the separation tank 30. The separation liquid at this time is clean water, and there is no problem if it is poured directly into a public drainage channel. However, since the separation tank 30 and the separation water receiving tank 11 are contaminated with urine at the beginning of switching after the first solid-liquid separation, the washing water at that time is transferred to the septic tank for a while. After washing, use as secondary water or drain into public drains. The filtered solid content is dropped from the endless belt-shaped screen conveyor 5 at the end of the follower roll 4b, and is accumulated in the solid content collection pit 35 together with the first solid-liquid separation. The accumulated solid content is appropriately transferred to a fermentation facility, but since it is dehydrated to a water content of 75 to 80%, it can enter the fermentation reaction without using a large amount of additives such as sawdust.

It is a top view of one embodiment of the present invention. It is a side view of the solid-liquid separator in one embodiment of the present invention. It is a figure explaining the acrylic small tank in one Embodiment of this invention. It is a figure explaining the action | operation of the pressing roll and exit side guide roll in one Embodiment of this invention. It is a figure explaining the conventional solid-liquid separator. It is a figure explaining the decoloring apparatus in the conventional livestock wastewater treatment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solid-liquid separation system provided with the decoloring processing function 2 Support | pillar 3 Main body frame 4a Drive roll 4b Follower roll 5 Screen conveyor 8 Preliminary squeeze roller 10 Squeeze roller 11 Separation water receptacle 12 Shower 13 Brush 14 Cleaning device 15 Air nozzle group 16 Inlet side Guide roll 17 Exit side guide roll 20 Bracket 21 Spring 24 Bearing support plate 27 Blower 30 Separation tank 35 Solid content collection pit 50 Base 51 First reaction tank 52 Second reaction tank 53, 54, 58 Flow path 55 Made of acrylic Small tank 56 Flow rate adjusting tank 57 Partition plate 59 Agglomerated slurry supply tank 60, 62, 63 Organic coagulant addition port 61 Ferric sulfate input pipe 64 Activated carbon and other additive input pipe 70 Filtration inlet of septic tank

Claims (5)

  Means for adding ferric sulfate to the filtrate aerated in the septic tank, a first reaction tank for introducing and stirring the liquid to which polyferric sulfate has been added, and processing in the first reaction tank Means for adding an organic flocculant in the course of transferring the liquid to the second reaction tank, and the slurry which has been reacted in the second reaction tank and separated into solid and liquid components is inclined and continuously driven. A solid-liquid separation system having a function of decolorizing treatment water for septic tank treated water comprising means for supplying to a lower position upstream of the screen conveyor and means for continuously pressing and slurrying the slurry being conveyed by the conveyor. .   The means for adding ferric sulfate to the filtrate is a cylindrical tank partitioned by a partition plate, in which polyferric sulfate is added in the upstream section, and additives such as activated carbon are added in the downstream section. The solid-liquid separation system provided with the decoloring processing function of the septic tank processing water of Claim 1.   The means for separating the solid and the liquid is provided with a plurality of squeezing rollers on the upper surface of the screen conveyor, and while being lifted and conveyed toward the downstream side, the liquid content of the slurry is separated by its own weight and the pressure of the squeezing roller. The solid-liquid separation system having a function of decoloring treatment water for septic tank treatment water according to claim 1 or 2, wherein solid-liquid separation is performed by falling from the mesh and solid content falling from the downstream end thereof.   Since the first reaction tank is additionally provided with an introduction path provided with a means for adding an organic flocculant to the raw water from the raw urine tank, it can also be used for the initial solid-liquid separation in the livestock waste disposal process. The solid-liquid separation system provided with the function of decoloring treatment water of septic tank treatment water according to any one of claims 1 to 3, wherein the system has a function.   By separately providing a means for adding an organic flocculant during the transfer of the liquid treated in the first reaction tank to the second reaction tank, it is possible to perform the decoloration treatment of septic tank treatment water and the solid-liquid separation treatment of feces etc. The solid-liquid separation system having a function of decoloring treatment water of septic tank treatment water according to claim 4, wherein the organic flocculant has a function of selectively using different organic flocculants depending on the case.

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