JP6285242B2 - Waste water treatment facility and waste water treatment method - Google Patents

Description

  The present invention relates to a wastewater treatment facility and a wastewater treatment method for biologically treating organic wastewater.

  Organic wastewater such as septic tank sludge and human waste is received in the receiving tank and then stored in the previous storage tank. The organic wastewater after the solid content is separated in the dehydration facility is biologically treated by microorganisms in the biological treatment facility. ing. The solid content separated from the solid content in the dehydration facility is incinerated or reused as a combustion aid or fertilizer.

  Patent Document 1 provides a urine treatment device that can stabilize septic tank sludge, improve the decomposition of organic matter in living urine, particularly polymer organic matter, and can improve solid-liquid separation without generating malodor. An apparatus for treating wastewater from human waste has been proposed.

  The human wastewater treatment apparatus includes an addition unit that introduces raw urine and septic tank sludge, introduces urine wastewater, and adds and mixes an additive containing a dephosphorization agent, and adds and mixes the additive and additive in the addition unit. A pre-reaction means for introducing and oxidizing, a sludge settling tank for solid-liquid separation of waste water treated by the pre-reaction means into a supernatant and sludge, and a dehydrating means for dewatering the sludge separated in the sludge settling tank. And a reaction means for introducing the supernatant liquid separated in the sludge settling tank to perform nitrification / denitrification treatment, and a solid-liquid separation means for solid-liquid separation of the suspension sent from the reaction means into sludge and treatment liquid. And a return means for returning the excess sludge generated in the reaction means to the addition section or its preceding process.

  And, by using an additive containing a silica component as an additive, the property is stabilized by adjusting the facultative and anaerobic useful bacteria that are excellent in degradability of high-molecular organic substances in the pre-reaction means to be the preferred species. Thus, by improving the solid-liquid separation property of the sludge in the sludge settling tank, the amount of sludge to be dewatered by the dewatering means is consequently reduced.

JP 11-33591 A

  The treatment device for human waste wastewater described in Patent Document 1 promotes dephosphorization and oxidative decomposition of organic matter in a pre-reaction means to which oxygen is supplied through an air diffuser or the like, so that it can be used in a nitrification / denitrification treatment tank in the latter stage. Although the burden on organic substances is reduced, most of the facultative anaerobic bacteria that have become the preferred species by the additive containing the silica component are separated and removed together with the solid by the dehydration means. There is a problem that useful anaerobic bacteria are not preferred species, the efficiency of nitrification / denitrification treatment is not improved so much, and the amount of excess sludge increases.

  In view of the above-described problems, the object of the present invention is to improve the processing efficiency of waste liquid after solid-liquid separation and reduce the generation amount of solids separated by solid-liquid separation while reducing the generation amount of excess sludge. The present invention is to provide a wastewater treatment facility and a wastewater treatment method that can be used.

In order to achieve the above-mentioned object, the first characteristic configuration of the wastewater treatment facility according to the present invention is the septic tank sludge receiving tank for receiving the septic tank sludge which is organic waste water, as described in claim 1 of the claim, Desalination equipment that removes debris from the organic wastewater received in the septic tank sludge receiving tank, and the dewatered sludge and liquid that are the solid content of the organic wastewater from which debris has been removed by the debris equipment A wastewater treatment facility comprising: a dehydration facility for separating the wastewater, and a biological treatment facility for biologically treating organic wastewater, which is a liquid component separated by solid-liquid separation in the dehydration facility, with a microorganism. The biological treatment equipment is provided with a holding part filled with a biological treatment aid that predominates a specific microorganism group, and an internal tank reactor or an external tank reactor to which sludge from the biological treatment equipment is circulated and supplied. With , In that it includes a sludge supply path for supplying the organic wastewater before the specific microorganisms are dehydrated by the dewatering equipment to dominant of sludge by the reactor.

  The biological flora constituting the activated sludge is changed by the biological treatment aid eluted from the reactor provided in the biological treatment facility, and the specific microorganism group becomes dominant. As the treatment is promoted, the amount of excess sludge generated is reduced. Furthermore, since organic wastewater before being dehydrated in the dehydration facility comes into contact with the dominated specific microorganism group, proteins, starch, lipids, etc., which are slight organic solid components contained in the septic tank sludge, have a bad odor. It is efficiently decomposed and volume-reduced without the occurrence of water, and self-degradation of surplus specific microorganisms is promoted. As a result, it is possible to achieve a significant reduction in the solid content separated by solid-liquid separation in the dehydration facility, that is, the dehydrated cake, and it is also possible to avoid the deodorized cake from giving off a bad odor. In addition, since the liquid component that has been separated into solid and liquid by the dehydration facility is biologically processed in a biological treatment facility in which the specific microorganism group is predominated in advance, no matter what specific microorganism group is removed by the dehydration process, It is not affected.

  As described in claim 2, the second feature configuration includes a contact treatment facility upstream of the dehydration facility in addition to the first feature configuration described above, and the specific microorganism group is superior by the reactor. It is in the point which supplies the fortified sludge to the said contact treatment equipment.

  The organic wastewater before being dehydrated in the dehydration facility is stably and efficiently decomposed and reduced in volume by contacting with the dominant specific microorganism group in the contact treatment facility.

  As described in claim 3, the third characteristic configuration is generated in the biological treatment facility in addition to the first or second characteristic configuration described above, and the specific microorganism group is dominated by the reactor. It is in the point provided with the 1st sludge supply mechanism which supplies sludge to the said septic tank sludge acceptance tank.

  When the sludge in which the specific microorganism group is dominant in the biological treatment facility is supplied to the septic tank sludge receiving tank by the first sludge supply mechanism, the sludge in the septic tank sludge receiving tank is spoiled by the action of the specific microorganism group Even if it is the sludge which carried out, generation | occurrence | production of a bad smell comes to be suppressed effectively.

  In addition to any one of the first to third feature configurations described above, the fourth feature configuration further includes an urine receiving tank that receives organic urine and urine, as described in claim 4. The organic waste water in the human waste receiving tank is configured to be contact-treated with the specific microorganism group in the contact treatment facility.

  Even when organic wastewater contains not only septic tank sludge but also urine, the organic wastewater before being dehydrated by the dehydration equipment is contacted with the specific microorganism group that has become dominant. Proteins, starches, lipids, and the like, which are organic solid components, are efficiently decomposed and reduced in volume without causing bad odor, and self-degradation of microbial groups in the sludge is promoted. As a result, it is possible to achieve a significant reduction in the solid content separated by solid-liquid separation in the dehydration facility, that is, the dehydrated cake, and it is also possible to avoid the deodorized cake from giving off a bad odor.

  In addition to any one of the first to third characteristic configurations described above, the fifth characteristic configuration further includes an organic wastewater and urine receiving tank and a urine receiving tank, The human waste received in the human waste receiving tank is biologically processed by the biological processing facility.

  When organic wastewater contains not only septic tank sludge but also urine, the human waste received in the human waste receiving tank is biologically processed in the biological treatment facility where the specific microorganisms are dominant. Organic substances are efficiently biologically treated by the action of specific microorganisms in the biological treatment facility.

  In the sixth feature configuration, in addition to the fourth or fifth feature configuration described above, the specific microbial group is dominant by the reactor generated in the biological treatment facility. It is in the point provided with the 2nd sludge supply mechanism which supplies sludge to the above-mentioned human waste receiving tank.

  When the sludge in which the specific microorganism group is dominant is supplied to the urine receiving tank by the second sludge supply mechanism, the organic solid matter is pre-decomposed in the human waste receiving tank by the action of the specific microorganism group without giving off a bad odor. As a result, the load on the biological treatment facility in the subsequent stage is reduced.

  In the seventh feature configuration, in addition to any one of the first to sixth feature configurations described above, the contact treatment facility includes at least a solid contained in the organic waste water. It is in the point provided with the 3rd sludge supply mechanism which supplies the contact treatment tank made to contact the sludge in which the specific microorganism group was dominant, and the sludge in which the specific microorganism group was dominant in the said contact treatment tank.

  The sludge in which the specific microorganism group is dominated by the reactor provided in the biological treatment facility is supplied to the contact treatment tank through the third sludge supply mechanism, and the solid content contained in the organic wastewater by the specific microorganism group in the contact treatment tank. By being decomposed, the volume is reduced without giving off a bad odor.

  The eighth characteristic configuration is that, as described in the eighth aspect, in addition to the seventh characteristic configuration described above, an aeration mechanism for aerating the organic waste water in the contact treatment tank is provided.

  When the contact treatment tank is provided with an aeration mechanism and aerated organic wastewater is aerated, the decomposition of the solids contained in the organic wastewater by the specific microorganism group is further promoted.

The first characteristic configuration of the wastewater treatment method according to the present invention is the organic wastewater from which septic tank sludge which is organic wastewater is received and dehydrated, and solid content is removed by the dehydration treatment as described in claim 9 A wastewater treatment method for biologically treating
And certain microorganisms dominant process for dominant the particular microorganisms in contact with the biological treatment aids in the process of the biological treatment, is dominated reduction in the course of the biological treatment by the particular microorganisms dominant process And a contact treatment in which the sludge containing the specific microorganism group is supplied to and contacted with the organic waste water before the dehydration treatment.

  By supplying sludge containing specific microbial groups predominated in organic wastewater before dehydration treatment, the solid content of organic wastewater is efficiently decomposed and the volume of solid content generated by dehydration treatment is greatly reduced. To come. Even if the sludge containing the specific microorganism group is removed together with the solid matter by the dehydration treatment, the biological treatment is efficiently performed by the specific microorganism group that has been dominated by the specific microorganism group predominance treatment. As a result, the amount of excess sludge generated by biological treatment is also reduced.

As described in claim 10, the second characteristic configuration is that, in addition to the first characteristic configuration described above, urine is further included in the organic waste water to be dehydrated.
Even if human waste is included in addition to septic tank sludge as organic wastewater, the sludge containing specific microorganisms predominated in the organic wastewater before dehydration is supplied to solidify the organic wastewater. The content is efficiently decomposed, and the volume of the solid content generated by the dehydration process is greatly reduced.

  As described above, according to the present invention, it is possible to improve the processing efficiency of the waste liquid after solid-liquid separation and reduce the generation amount of solid content separated by solid-liquid separation while reducing the generation amount of excess sludge. It has become possible to provide a wastewater treatment facility and a wastewater treatment method.

Explanatory drawing of 1st embodiment of the wastewater treatment facility by this invention (A) is a block diagram of a reactor outside the tank, (b) is an explanatory diagram of a biological treatment aid accommodated in the reactor outside the tank Explanatory drawing of 2nd embodiment of the wastewater treatment facility by this invention Explanatory drawing of 3rd embodiment of the wastewater treatment facility by this invention Explanatory drawing of 4th embodiment of the wastewater treatment facility by this invention Explanatory drawing of 5th embodiment of the wastewater treatment facility by this invention Explanatory drawing of 6th embodiment of the wastewater treatment facility by this invention

Hereinafter, embodiments of a wastewater treatment facility and a wastewater treatment method according to the present invention will be described.
As shown in FIG. 1, a wastewater treatment facility 1 includes a septic tank sludge receiving tank 10 that receives and temporarily stores septic tank sludge, which is organic wastewater that has been carried in, and a debris facility that removes residue etc. from the received septic tank sludge. 11, a pre-storage tank 12 that pre-stores the septic tank sludge from which residue has been removed, a dehydration facility 13 that dehydrates the pre-stored septic tank sludge, and a storage tank 14 that stores waste water that is the liquid after dehydration. And a biological treatment tank 15 for biologically treating the stored wastewater, and a solid-liquid separation tank 16 for solid-liquid separation of the wastewater after biological treatment.

  The biological treatment tank 15 and the solid-liquid separation tank 16 constitute a biological treatment facility. An anaerobic treatment tank and an aerobic treatment tank for treating wastewater by a nitrification / denitrification method are provided as the biological treatment tank 15, and a membrane separation apparatus in which a membrane separation apparatus having a diffuser at the bottom is immersed as the solid-liquid separation tank 16 A tank is provided. The permeate filtered by the membrane separation device is taken out from the wastewater after biological treatment, and discharged to rivers and the like after advanced treatment.

  The configuration of the biological treatment tank 15 is not limited to this example. The biological treatment tank 15 includes only an aerobic treatment tank that employs the activated sludge method, and one anaerobic treatment and an aerobic treatment. The structure provided with the deep reaction tank etc. which were comprised by this may be sufficient. Moreover, the solid-liquid separation tank 16 may also be comprised with the precipitation tank.

  The biological treatment facilities 15 and 16 are provided with a reactor 17 outside the tank filled with a biological treatment aid that predominates a specific microorganism group among microorganisms constituting the activated sludge. A branch path Ld is provided in the first sludge return path L1 for returning a part of the excess sludge in the solid-liquid separation tank 16 to the biological treatment tank 15, and a reactor 17 is installed in the branch path Ld via the valve V1. . The valve V1 is used for adjusting the additive concentration of the reactor.

As shown in FIGS. 2 (a) and 2 (b), the outside tank type reactor 17 includes a biological treatment aid holding unit 17a configured with a mesh-like container so that sludge flows, and a sludge retention tank 17b. And an inflow pipe 17c, an outflow pipe 17c 'and a drain pipe 17d to which the branch path Ld is connected, and an air diffuser as a circulation mechanism 17e that circulates and feeds sludge to the biological treatment aid holding part 17a in the sludge retention tank 17b. Etc. Incidentally, the conduit 17c outflow pipe, conduit 17c 'is not good be configured as inlet pipe.

  As the biological treatment aid, one or more kinds of humus components and mineral lumps formed into pellets, specifically humus, humus extract, humic acid, fulvic acid, silica sand, silica stone, and the like are used. When sludge comes into contact with a biological treatment aid composed of such components, soil microorganisms that are facultative anaerobic bacteria are dominant, and for example, soil microorganisms such as Bacillus bacteria are dominant.

  When the sludge that has contacted the biological treatment aid by the reactor 17 is returned to the biological treatment tank 15, the specific microorganism group that is a soil microorganism group that is a facultative anaerobic bacterium is dominant in the biological treatment tank 15, and the specific identification is performed. Biological treatments such as nitrification and denitrification are carried out by the microorganism group. In the process, the specific microorganism group flows into the solid-liquid separation tank 16 together with the waste water, and further circulates through the first sludge return path L1.

  In the wastewater treatment facility 1, contact treatment in which sludge generated in the biological treatment facility and in which the specific microorganism group is dominated by the reactor 17 is supplied to the organic wastewater before being dehydrated in the dehydration facility 13 is contact-treated. Equipment 20 is provided.

  The contact treatment equipment 20 includes a contact treatment tank 20a provided between the dewatering equipment 11 and the previous storage tank 12, and a third sludge supply mechanism for supplying the contact treatment tank 20a with sludge in which a specific microorganism group is dominant. 20b. Any of the excess sludge supply path L2 for supplying the excess sludge extracted in the solid-liquid separation tank 16 to the contact treatment tank 20a and the second sludge return path L3 for supplying the sludge extracted from the biological treatment tank 15 to the contact treatment tank 20a. Either one or both constitutes the third sludge supply mechanism 20b.

  In the contact treatment tank 20a, the septic tank sludge from which the debris and the like have been removed by the dewatering equipment 11 and the specific microorganism group supplied from the third sludge supply mechanism 20b are mixed and subjected to contact treatment for about 1 to 3 days. . In the contact treatment, some of the undegraded organic solids contained in the septic tank sludge are decomposed by the dominated specific microorganism group to reduce the volume of the solids, and the odor-causing bacteria are Reduces malodor.

  At this time, it is more preferable to provide the aeration apparatus 20c connected to the blower B in the contact treatment tank 20a to keep the inside of the tank in an aerobic condition, and the volume reduction effect is enhanced by aeration.

  The septic tank sludge that has been contact-treated in the contact treatment tank 20a is stored in the pre-storage tank 12, and then dehydrated in the dehydration equipment 13, and separated into dehydrated sludge that is solid and liquid waste that is liquid, and the waste water is stored. It is stored in the tank 14 and is quantitatively supplied to the biological treatment tank in the subsequent stage. As the dewatering equipment 13, a screw press dewatering machine, a centrifugal dewatering machine, a filter press dewatering machine, or a sludge settling tank is preferably used.

  The dehydrated dewatered sludge is incinerated or reused as a combustion aid or fertilizer. By performing the contact treatment in the contact treatment tank 20a, the amount of dewatered sludge is greatly reduced. For example, when the amount of air blown from the air diffuser 20c is 800 g-O2 / m3 · day or more for about 2 days, the result is that the amount of sludge is reduced by 30% compared to the case where the contact treatment is not performed. . Moreover, although the reduction effect of sludge falls when not using the diffuser 20c, it has been confirmed that the remarkable sludge reduction effect is acquired compared with the case where a contact process is not performed.

  In the present embodiment, the example in which the contact treatment tank 20a is provided between the scouring equipment 11 and the previous storage tank 12 has been described. However, the front storage tank 12 may have a function as the contact treatment tank 20a. It is sufficient that the sludge in which at least the specific microorganism group is dominant is supplied to the organic waste water before being dehydrated by the dehydration equipment 13 and subjected to the contact treatment.

  By dehydrating the dehydration equipment 13, the specific microorganism group contained in the waste water that is a liquid component is extremely reduced. However, since the specific microorganism group is dominant in the biological treatment tank 15 by the reactor 17, Subsequent nitrification / denitrification treatment will not be hindered.

  Furthermore, as shown in FIG. 3, it is preferable to include a first sludge supply mechanism 21 that supplies the sludge supplied from the third sludge supply mechanism 20 b to the septic tank sludge receiving tank 10. When the sludge that has been dominated is supplied to the septic tank sludge receiving tank 10 by the first sludge supply mechanism 21, the specific microorganism group that has become dominant in the septic tank sludge receiving tank 10 functions as a deodorizing agent, so Even if it is the advanced sludge, generation | occurrence | production of a bad odor comes to be suppressed effectively. Although FIG. 3 shows a mode in which the sludge supplied by the first sludge supply mechanism 21 is supplied from the second sludge return path L3, a configuration in which the sludge is supplied from the excess sludge supply path L2 may be used. The structure supplied from both sides may be sufficient.

  In the above description, the example in which the biological treatment facilities 15 and 16 are provided with the reactor 17 outside the tank has been described. However, as shown by the broken lines in FIGS. 1 and 3, the biological treatment tank 15 or the solid-liquid separation tank 16 is provided. An immersion type reactor may be provided. In addition, what is necessary is just to comprise a submerged reactor by the mesh-shaped container with which the biological treatment adjuvant which predominates a specific microorganism group among microorganisms which comprise activated sludge was filled.

  FIG. 4 shows a mode in which human waste is contained in addition to septic tank sludge as organic waste water. In this example, a urine receiving tank 30 for receiving human waste and a scouring facility 31 for removing the scum from the received human urine are further provided. The human waste from which the residue is removed is configured to be contact-treated in the contact treatment tank 20a together with the septic tank sludge.

  When the amount of human waste is relatively small compared to the septic tank sludge, the human waste before being dehydrated by the dehydration equipment 13 is also configured to be contact-treated by a specific microorganism group that has become dominant together with the septic tank sludge. Therefore, proteins, starch, lipids, etc., which are organic solid components contained in septic tank sludge and human waste, are efficiently decomposed and reduced in volume without causing bad odors, and self-degradation of microbial groups in sludge Is promoted.

  As a result, it is possible to achieve a significant reduction in the solid content separated by solid-liquid separation in the dehydration facility, that is, the dehydrated cake, and it is also possible to avoid the deodorized cake from giving off a bad odor. The case where the amount of human waste is relatively small compared to the septic tank sludge refers to the case where the amount of human waste is less than about 30% of the amount of septic tank sludge.

  As shown in FIG. 5, it is preferable to provide the 1st sludge supply mechanism 21 which supplies the sludge supplied from the 3rd sludge supply mechanism 20b (L2, L3) to the septic tank sludge receiving tank 10 also in this case, Furthermore, it is preferable to include a second sludge supply mechanism 22 that supplies the sludge supplied from the third sludge supply mechanism 20b (L2, L3) to the urine receiving tank 30. Generation of odors such as hydrogen sulfide, amine, and mercaptan is effectively suppressed by the action of the specific microorganism group in the human waste receiving tank 30.

  FIG. 6 shows another embodiment in the case where human waste is contained in addition to septic tank sludge as organic waste water. In this example, a urine receiving tank 30 for receiving human waste, a scouring equipment 31 for removing the scum from the received human urine, and a urine storage tank 32 for storing the sewage from which the scum has been removed are further provided. The human waste stored in the human waste storage tank 32 is biologically processed by the biological processing facilities 15 and 16.

  When organic waste water contains not only septic tank sludge but also a relatively large amount of human waste, human waste received in the human waste receiving tank 30 is biologically processed in the biological treatment facilities 15 and 16 where the specific microorganisms predominate. The untreated organic substance contained in is efficiently biologically treated by the biological treatment facilities 15 and 16. The case of containing a relatively large amount of human waste refers to a case where the amount of human waste is about 30% or more of the amount of septic tank sludge.

  As shown in FIG. 7, it is preferable to provide the 1st sludge supply mechanism 21 which supplies the sludge supplied from the 3rd sludge supply mechanism 20b (L2, L3) to the septic tank sludge receiving tank 10 also in this case, Furthermore, it is preferable to include a second sludge supply mechanism 22 that supplies the sludge supplied from the third sludge supply mechanism 20b (L2, L3) to the urine receiving tank 30.

  When the sludge in which the specific microorganism group is dominant is supplied to the human urine receiving tank 30 by the second sludge supply mechanism 22, the specific microorganism group which has been dominant in the human waste receiving tank functions as a deodorizer, Organic solids can be pre-decomposed without giving off malodors caused by odors such as amines and mercaptans, and the burden on the biological treatment facilities 15 and 16 in the subsequent stages can be reduced.

  The wastewater treatment facility 1 described above executes a wastewater treatment method in which septic tank sludge, which is organic wastewater, is received and dehydrated, and the organic wastewater solid-liquid separated in the dehydration treatment is biologically treated with microorganisms. That is, the specific microorganism group predominating treatment that makes the specific microorganism group dominant by contacting the biological treatment aid in the process of biological treatment, and the sludge containing the specific microorganism group generated in the biological treatment process before the dehydration treatment This is a wastewater treatment method in which the organic wastewater is supplied and contacted. The same applies to the case where urine is further contained in the organic wastewater to be dehydrated.

  According to the wastewater treatment method, the sludge containing the specific microorganism group predominated in the organic wastewater before the dehydration treatment is supplied, so that the solid content of the organic wastewater is efficiently decomposed and the dewatering treatment is performed. The volume of the solid content is greatly reduced. Even if the sludge containing the specific microorganism group is removed together with the solid matter by the dehydration treatment, the biological treatment is efficiently performed by the specific microorganism group that has been dominated by the specific microorganism group predominance treatment. As a result, the amount of excess sludge generated by biological treatment is also reduced.

  The embodiment described above shows an example of the present invention, and the technical scope of the present invention is not limited to the embodiment, and the specific configuration of the reactor, the biological treatment facilities 15 and 16, etc. The specific configuration, each mud supply mechanism, and the like can be changed and designed within the scope of the effects of the present invention.

1: Wastewater treatment equipment 10: Septic tank sludge receiving tank 15: Biological treatment tank (biological treatment equipment)
16: Solid-liquid separation tank (biological treatment equipment)
17: Reactor 20: Contact treatment facility 20a: Contact treatment tank 20b: Third sludge supply mechanism 20c: Air diffuser 21: First sludge supply mechanism 22: Second sludge supply mechanism

Claims (10)

A septic tank sludge receiving tank for receiving septic tank sludge, which is organic waste water, a scouring equipment for removing scum from the organic waste water received in the septic tank sludge receiving tank, Dewatering equipment that separates organic wastewater after the residue into solid sludge dehydrated sludge and liquid wastewater, and organism that biologically treats organic wastewater that is liquid separated by the above dehydration equipment with microorganisms A wastewater treatment facility equipped with a treatment facility,
An in-bath reactor or an out-bath reactor to which a sludge of the biological treatment equipment is circulated and supplied is provided with a holding part filled with a biological treatment aid that predominates a specific microorganism group among the microorganisms. And prepare for
A sludge supply path for supplying the sludge predominated by the specific microorganism group by the reactor to the organic waste water before being dehydrated by the dehydration facility ;
Wastewater treatment facility equipped with .   The wastewater treatment facility according to claim 1, further comprising a contact treatment facility upstream of the dewatering facility, and supplying the contact treatment facility with sludge in which a specific microorganism group is dominated by the reactor.   3. The wastewater treatment facility according to claim 1, further comprising a first sludge supply mechanism configured to supply the sludge generated in the biological treatment facility and having a specific microorganism group dominated by the reactor to the septic tank sludge receiving tank.   4. The method according to claim 1, further comprising a urine receiving tank for receiving urine, which is organic waste water, and configured to contact the organic waste water in the human waste receiving tank with the specific microorganism group in the contact treatment facility. The wastewater treatment facility described in Crab.   The wastewater treatment facility according to any one of claims 1 to 3, further comprising a urine receiving tank that receives organic wastewater and urine, and biologically treats the human waste received in the human waste receiving tank with the biological treatment facility.   The wastewater treatment facility according to claim 4 or 5, further comprising a second sludge supply mechanism for supplying the sludge generated in the biological treatment facility and having a specific microorganism group dominant by the reactor to the human waste receiving tank.   The contact treatment facility comprises a contact treatment tank for contacting at least solids contained in organic waste water with sludge in which a specific microorganism group is dominated, and sludge in which the specific microorganism group is dominated in the contact treatment tank. The wastewater treatment facility according to any one of claims 1 to 6, further comprising a third sludge supply mechanism for supplying.   The wastewater treatment facility according to claim 7, further comprising an aeration mechanism for aerating the organic wastewater in the contact treatment tank. A wastewater treatment method in which septic tank sludge that is organic wastewater is received and dehydrated, and the organic wastewater from which solid content has been removed by the dehydration treatment is biologically treated by microorganisms,
And certain microorganisms dominant process for dominant the particular microorganisms in contact with the biological treatment aids in the process of the biological treatment, is dominated reduction in the course of the biological treatment by the particular microorganisms dominant process A wastewater treatment method comprising: contacting the sludge containing the specific microorganism group with the organic wastewater before the dehydration treatment and bringing it into contact therewith.   The wastewater treatment method according to claim 9, further comprising urine in the organic wastewater to be dehydrated.

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