CN111718083A - High-concentration rural sewage treatment device and method for removing pollutants in grading manner - Google Patents
High-concentration rural sewage treatment device and method for removing pollutants in grading manner Download PDFInfo
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- CN111718083A CN111718083A CN202010733183.3A CN202010733183A CN111718083A CN 111718083 A CN111718083 A CN 111718083A CN 202010733183 A CN202010733183 A CN 202010733183A CN 111718083 A CN111718083 A CN 111718083A
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
A high-concentration rural sewage treatment device and method for removing pollutants in a grading way, belonging to the technical field of sewage treatment. The specific scheme is as follows: the utility model provides a rural sewage treatment plant of high concentration of getting rid of pollutant in grades, includes inlet tube, circulation compound hydrolytic acidification unit, multistage AO unit, chemical phosphorus removal unit and outlet pipe, along the flow direction of sewage, inlet tube, circulation compound hydrolytic acidification unit, multistage AO unit, chemical phosphorus removal unit and outlet pipe are established ties in proper order and are communicate. Aiming at rural high-concentration domestic sewage, the invention designs an integrated sewage treatment device for removing pollutants in a three-stage series connection and grading manner, the rural high-concentration domestic sewage is treated by adopting a three-stage series connection coupling grading pollutant removing technology, a circulating composite hydrolysis acidification unit improves the biodegradability of the high-concentration sewage, a multi-stage AO unit strengthens biological denitrification, and a chemical phosphorus removal unit improves the phosphorus removal rate; the integrated equipment has compact layout, small occupied area and convenient maintenance.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a high-concentration rural sewage treatment device and method for removing pollutants in a grading manner.
Background
With the rapid growth of economic technology, the rural living standard and the living style are greatly changed, and the pressure of rural domestic sewage pollution on the environment is increased. The construction of beautiful villages requires that the living standard of hundreds of millions of farmers is improved, meanwhile, the quality of rural life, particularly the environment protection and treatment strength, is improved, and the integral improvement of rural villages and villages is promoted.
But the sewage in rural areas is greatly different from the sewage in cities and towns. As the rural areas mainly use planting and breeding industries as main domestic economic sources, and waste water generated by decentralized breeding is mixed with domestic sewage of farmers for discharge, the rural domestic sewage has high organic matter concentration and high concentrations of nutrient substances such as nitrogen, phosphorus and the like. If the same treatment mode as that of urban sewage is adopted, such as the traditional AAO or CASS process, the rural domestic sewage with high COD and high nitrogen and phosphorus is treated, the current rural sewage discharge standard is difficult to reach, and the yield of the residual sludge is high. On the other hand, the rural areas have the characteristics of dispersed inhabitants, intermittent sewage discharge, large instantaneous discharge amount and lower total daily discharge amount than urban sewage, so that the rural areas cannot adopt a unified pipe network sewage collection and centralized large-scale sewage treatment mode of the urban areas, and the distributed integrated sewage treatment process is more suitable for being applied.
The existing distributed integrated sewage treatment process, such as an MBBR process or an MBR process with an anaerobic reaction tank and an anoxic reaction tank, has the problems of weak impact resistance, complex operation control and low sewage treatment efficiency when treating high-concentration domestic sewage. Therefore, it is urgently needed to develop an integrated treatment device and a rural high-concentration domestic sewage treatment method which can efficiently purify high-concentration domestic sewage in rural areas and flexibly adjust an operation process according to operation requirements, so as to realize rural domestic sewage treatment with high efficiency, low cost and low floor area.
Disclosure of Invention
The invention provides a high-concentration rural sewage treatment device for removing pollutants in a grading manner, aiming at solving the problems of complex operation control and low high-concentration sewage treatment efficiency of a distributed integrated sewage treatment process in the prior art.
The invention aims to provide a sewage treatment method of an integrated high-concentration rural sewage treatment device for removing pollutants in a grading manner.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a rural sewage treatment plant of high concentration of getting rid of pollutant in grades, includes inlet tube, circulation compound hydrolytic acidification unit, multistage AO unit, chemical phosphorus removal unit and outlet pipe, along the flow direction of sewage, inlet tube, circulation compound hydrolytic acidification unit, multistage AO unit, chemical phosphorus removal unit and outlet pipe are established ties in proper order and are communicate.
Further, the device still includes sedimentation tank, disinfection clean water basin, storage mud sump, medicine system and control system, the entry of sedimentation tank and the export intercommunication of multistage AO unit, export and the entry intercommunication of chemical dephosphorization unit, the entry in disinfection clean water basin and the export intercommunication of chemical dephosphorization unit, export and outlet pipe intercommunication, sedimentation tank and chemical dephosphorization unit all communicate with storage mud sump through the suction pipe, storage mud sump passes through mud pipe and external intercommunication, all be provided with the sludge pump on suction pipe and the mud pipe, medicine system passes through the medicament pipe respectively with multistage AO unit and chemical dephosphorization unit intercommunication, sludge pump and medicine system all are connected with the control system electricity.
Further, the device also comprises a deodorization system which is respectively communicated with the circulating composite hydrolysis acidification unit, the multistage AO unit, the sedimentation tank, the chemical phosphorus removal unit, the disinfection clean water tank and the sludge storage tank through a gas collecting pipe.
Furthermore, the device also comprises a plurality of inspection ports, wherein the inspection ports are respectively arranged on the top upper cover plates of the circulating composite hydrolysis acidification unit, the multistage AO unit, the sedimentation tank, the chemical phosphorus removal unit, the disinfection clean water tank and the sludge storage tank.
Further, the compound hydrolytic acidification unit that circulates includes backward flow pond and a plurality of hydrolytic acidification pond, a plurality of hydrolytic acidification pond is established ties the intercommunication and all is provided with filler I in it in and, first hydrolytic acidification pond and inlet tube intercommunication, last hydrolytic acidification pond and backward flow pond intercommunication, backward flow pond and multistage AO unit intercommunication, be provided with immersible pump I in the backward flow pond, immersible pump I passes through the entrance intercommunication in back flow I and first hydrolytic acidification pond, immersible pump I is connected with the control system electricity.
Further, multistage AO unit includes a plurality of oxygen deficiency pond and a plurality of good oxygen pond, a plurality of oxygen deficiency pond and a plurality of good oxygen pond set gradually in turn and establish ties the intercommunication, be provided with in the first oxygen deficiency pond pack II and with the compound hydrolytic acidification unit intercommunication of circulation, last good oxygen pond and sedimentation tank intercommunication, the exit in first good oxygen pond is provided with immersible pump II, immersible pump II is through the entrance intercommunication in back flow II and first oxygen deficiency pond, and the entrance in last oxygen deficiency pond is passed through medicament pipe I and dosing system intercommunication, all is provided with agitating unit I in first oxygen deficiency pond and the last oxygen deficiency pond, and agitating unit I and immersible pump II all are connected with the control system electricity.
Further, first good oxygen pond includes a plurality of cell body, a plurality of cell body is established ties and is communicate, immersible pump II sets up in the exit of last cell body, and except that last cell body, all be provided with filler III in the rest of cells.
Further, the inside vertical solid-liquid separator I and the sludge bucket I that is provided with of sedimentation tank, sludge bucket I sets up the lower extreme at solid-liquid separator I, sludge bucket I is through inhaling mud pipe I and storing up mud pit intercommunication, sludge bucket I passes through the entrance intercommunication of mud back flow with multistage AO unit, multistage AO unit is through setting up overflow weir I and communicating pipe I and the I intercommunication of solid-liquid separator in multistage AO unit exit, the upper portion periphery of sedimentation tank is provided with all ring edge type play weir I.
Further, the chemical phosphorus removal unit includes coagulating basin and dephosphorization sedimentation tank, sedimentation tank and coagulating basin intercommunication, dephosphorization sedimentation tank and disinfection clean water basin intercommunication, the inside vertical solid-liquid separator II and the sludge fill II of being provided with of dephosphorization sedimentation tank, the sludge fill II sets up the lower extreme at solid-liquid separator II, sludge fill II is through inhaling mud pipe II and storage mud sump intercommunication, the coagulating basin is through setting up overflow weir II and communicating pipe II and the II intercommunication of solid-liquid separator in the inside upper end of coagulating basin, the upper portion periphery of dephosphorization sedimentation tank is provided with all edge type play weir II, medicament pipe II and medicine system intercommunication are passed through to the entrance of coagulating basin, be provided with agitating unit II in the coagulating basin, agitating unit II is connected with the control system electricity.
The treatment method of the high-concentration rural sewage treatment device for removing pollutants in a grading manner comprises the following steps:
the method comprises the following steps: the sewage flows into the circulating composite hydrolysis acidification unit through the water inlet pipe, a liquid I is obtained after hydrolysis acidification, one part of the liquid I flows into the multistage AO unit, and the other part of the liquid I flows back to an inlet of the circulating composite hydrolysis acidification unit to be mixed with the sewage flowing in through the water inlet pipe;
step two: the liquid I flowing into the multistage AO unit is subjected to multistage denitrification-nitrification reaction to obtain liquid II, the liquid II flows into a sedimentation tank, after solid-liquid separation, the obtained supernatant I flows into a chemical phosphorus removal unit, part of the precipitated sludge flows into a sludge storage tank, and part of the precipitated sludge flows back to an inlet of the multistage AO unit to be mixed with the flowing liquid I;
step three: supernatant I flowing into the chemical phosphorus removal unit is firstly mixed with a coagulant, then solid-liquid separation is carried out, obtained supernatant II flows into a disinfection clean water tank for disinfection treatment, then the supernatant II is discharged through a water outlet pipe, and precipitated sludge flows into a sludge storage tank;
step four: and discharging the sludge in the sludge storage tank.
Compared with the prior art, the invention has the beneficial effects that:
aiming at high-concentration domestic sewage, the invention designs an integrated high-concentration rural sewage treatment device for removing pollutants in a three-stage series connection and grading manner, the high-concentration rural sewage is treated by adopting a three-stage series coupling pollutant removing technology in a grading manner, a circulating composite hydrolysis acidification unit improves the biodegradability of the high-concentration rural sewage, a multi-stage AO unit strengthens biological denitrification, and a chemical phosphorus removal unit improves the phosphorus removal rate; the integrated equipment has compact layout, small occupied area and convenient maintenance.
Drawings
FIG. 1 is a plan view of the apparatus of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a piping diagram of the apparatus of the present invention;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;
FIG. 5 is a cross-sectional view taken along line C-C of FIG. 3;
FIG. 6 is a top plan view of the apparatus of the present invention;
in the figure: 1. a water inlet pipe, 2, a circulating composite hydrolysis acidification unit, 3, a multi-stage AO unit, 4, a sedimentation tank, 5, a chemical phosphorus removal unit, 6, a disinfection clean water tank, 7, a water outlet pipe, 8, a sludge storage tank, 9, a dosing system, 10, a control system, 11, a sludge suction pipe, 12, a sludge discharge pipe, 13, a sludge return pipe, 14, a sludge pump, 15, a medicament pipe, 16, a deodorization system, 17, a gas collecting pipe, 18, an inspection opening, 21, a hydrolysis acidification tank, 22, a return tank, 23, a filler I, 24, a submersible pump I, 25, a return pipe I, 26, a water passing hole I, 27, a water passing hole II, 31, an anoxic tank, 32, an aerobic tank, 33, a filler II, 34, a submersible pump II, 35, a return pipe II, 36, a stirring device I, 37, an aeration device, 38, a filler III, 39, an overflow weir I, 40, a communication pipe I, 41, a solid-liquid separator I, 42 and a, 43. the device comprises peripheral effluent weirs I, 44, overflow holes IV, 51, a coagulation tank, 52, a dephosphorization sedimentation tank, 53, solid-liquid separators II, 54, sludge hoppers II, 55, overflow weirs II, 56, communicating pipes II, 57, peripheral effluent weirs II, 58, stirring devices II, 59, overflow holes V, 61, submersible pumps III, 81, sludge hoppers III, 91, an external carbon source dosing barrel, 92, a coagulant dosing barrel, 93, a dosing pipe, 111, a sludge suction pipe I, 112, a sludge suction pipe II, 151, a medicament pipe I, 152, a medicament pipe II, 171, a collection main pipe, 172, a collection vertical pipe, 311 a primary anoxic tank, 312, a secondary anoxic tank, 313, an overflow hole III, 321, a primary aerobic tank, 322, a secondary aerobic tank, 371, an aeration pipeline, 372 and an aeration head.
Detailed Description
The technical scheme of the invention is explained in detail by combining the attached drawings 1-6 and the embodiment. In the description of the present invention, it is to be understood that: the terms "front", "rear", "left", "right", and the like, which indicate orientation, are used for convenience in describing the present invention, and do not indicate or imply that the elements referred to must have a particular orientation, and therefore, are not to be construed as specifically limiting the present invention.
Detailed description of the invention
The utility model provides a rural sewage treatment plant of high concentration of getting rid of pollutant in grades, includes inlet tube 1, circulation compound hydrolytic acidification unit 2, multistage AO unit 3, chemical phosphorus removal unit 5 and outlet pipe 7, along the flow direction of sewage, inlet tube 1, circulation compound hydrolytic acidification unit 2, multistage AO unit 3, chemical phosphorus removal unit 5 and outlet pipe 7 establish ties the intercommunication in proper order.
Further, the device still includes sedimentation tank 4, disinfection clean water basin 6, storage mud pond 8, medicine system 9 and control system 10, the entry of sedimentation tank 4 and multistage AO unit 3's export intercommunication, export and the entry intercommunication of chemical phosphorus removal unit 5, the entry of disinfection clean water basin 6 and the export intercommunication of chemical phosphorus removal unit 5, export and outlet pipe 7 intercommunication, sedimentation tank 4 and chemical phosphorus removal unit 5 all communicate with storage mud pond 8 through mud suction pipe 11, storage mud pond 8 communicates with external sludge dewatering device through mud pipe 12, all be provided with sludge pump 14 on mud pipe 12 and the mud suction pipe 11, medicine system 9 passes through medicament pipe 15 and communicates with multistage AO unit 3 and chemical phosphorus removal unit 5 respectively, sludge pump 14 and medicine system 9 all are connected with control system 10 electricity. Preferably, the control system 10 is a PLC control cabinet, the chemical feeding system 9 and the sludge pump 14 are controlled to be opened and closed according to a set program, the circulating composite hydrolysis-acidification unit 2, the multistage AO unit 3, the sedimentation tank 4, the chemical phosphorus removal unit 5, the sterilized clean water tank 6 and the sludge storage tank 8 are all independent closed units, and the whole device is a closed device.
Further, store up inside sludge bucket III 81 that is provided with of mud pit 8, mud pipe 12 and suction pipe 11 all communicate with sludge bucket III 81. The height of the sludge bucket III 81 is 60cm, and the wall of the sludge bucket III 81 and the bottom of the tank form an included angle of 50 degrees.
Further, the sedimentation tank 4 is in communication with the inlet of the multistage AO-unit 3 via a sludge return conduit 13.
Sewage flows into a circulating composite hydrolytic acidification unit 2 through a water inlet pipe 1 in sequence, flows into a multistage AO unit 3 after hydrolytic acidification, flows into a sedimentation tank 4 for sedimentation after denitrification and nitration reaction, after the precipitated sludge is sucked out through a sludge pump 14, one part of the precipitated sludge is sucked into a sludge storage tank 8 through a sludge suction pipe 11, the other part of the precipitated sludge flows back to an inlet of the multistage AO unit 3 through a sludge return pipe 13, the precipitated supernatant I flows into a chemical phosphorus removal unit 5, the sludge after chemical phosphorus removal is sucked into the sludge storage tank 8 through the sludge suction pipe 11, and the supernatant II after chemical phosphorus removal is disinfected through a disinfecting clean water tank 6 and then is discharged through a water outlet pipe 7. The sludge in the sedimentation tank 4 regularly flows back to the inlet of the multi-stage AO unit 3 according to the operation condition, and the device does not discharge the residual sludge during the operation.
Detailed description of the invention
The present embodiment is a further limitation on the first embodiment. The circulating composite hydrolysis acidification unit 2 comprises a reflux pool 22 and a plurality of hydrolysis acidification pools 21, wherein the hydrolysis acidification pools 21 are communicated in series and are internally provided with a filler I23, and the filling rate of the filler I23 in each hydrolysis acidification pool 21 is 50%. The first hydrolysis-acidification tank 21 is communicated with the water inlet pipe 1, the last hydrolysis-acidification tank 21 is adjacent to and communicated with the backflow tank 22 in series, the backflow tank 22 is communicated with the multistage AO unit 3, a submersible pump I24 is arranged in the backflow tank 22, the submersible pump I24 is communicated with an inlet of the first hydrolysis-acidification tank 21 through a backflow pipe I25, and the submersible pump I24 is electrically connected with the control system 10. The control system 10 controls the starting and stopping of the submersible pump I24. Preferably, there are four hydrolysis-acidification tanks 21, the end of each hydrolysis-acidification tank 21 is provided with a water passing hole i 26, the water passing hole i 26 penetrates through the tank walls of two adjacent hydrolysis-acidification tanks 21, each water passing hole i 26 is provided with a stainless steel net to prevent the filler i 23 from being washed away by sewage, the filler i 23 is a biomembrane filler, and a sponge filler, a composite filler composed of a polyethylene ball core, volcanic rock and polyurethane foam, or a combination filler of hydroformylation fibers and polyester filaments can be adopted. The filler I23 is fixed in the tank body of the hydrolytic acidification tank 21 through a stainless steel bracket, the overall height is 1.5m, and the top of the bracket is 40cm below the highest water level; the circulating composite hydrolysis-acidification unit 2 is in an anaerobic state, the flow direction of sewage in each hydrolysis-acidification tank 21 is S-shaped, namely when the water passing holes I-I on the tank walls of the first hydrolysis-acidification tank 21 and the second hydrolysis-acidification tank 21 are arranged at the rear, the water passing holes I-II on the tank walls of the second hydrolysis-acidification tank 21 and the third hydrolysis-acidification tank 21 are arranged at the front, the water passing holes I-III on the tank walls of the third hydrolysis-acidification tank 21 and the fourth hydrolysis-acidification tank 21 are arranged at the rear, and the water passing holes I-IV on the tank walls of the fourth hydrolysis-acidification tank 21 and the reflux tank 22 are arranged at the front.
Preferably, the water passing holes I-I and I-III are arranged at the bottom of the tank wall, and the water passing holes I-II and I-IV are arranged at the top of the tank wall. And the walls of the return pond 22 and the multistage AO units are provided with a water passing hole II 27, and the water passing hole II is arranged at the top of the pond wall.
The sewage enters a first hydrolysis-acidification tank 21 through a water inlet pipe 1, flows through a second hydrolysis-acidification tank 21, a third hydrolysis-acidification tank 21 and a fourth hydrolysis-acidification tank 21 in sequence to obtain a liquid I after hydrolysis-acidification, after the liquid I flows into a backflow tank 22, one part of the liquid I flows back to an inlet of the first hydrolysis-acidification tank 21 through a submersible pump I24 and a backflow pipe I25 to be mixed with inlet water and flows into the first hydrolysis-acidification tank 21, and the other part of the liquid I flows into a multistage AO unit 3 through a water hole II 27. And the backflow of the hydrolyzed and acidified liquid I enables the inlet water to be subjected to repeated circulating hydrolysis treatment, and provides power for mixing and stirring the liquid for the circulating composite hydrolysis and acidification unit 2. In the embodiment, the reflux ratio of the hydrolyzed and acidified liquid I is set to 10-30%, and in actual operation, the reflux ratio can be adjusted by the control system 10 according to the process operation condition.
High-concentration rural domestic sewage circularly flows in the circulating composite hydrolysis acidification unit 2, and macromolecular organic matters in the sewage are hydrolyzed into micromolecular organic matters. The biofilm filler increases the sludge concentration, the circular flow prolongs the hydraulic retention time and strengthens the hydrolysis effect.
The operation condition of the invention is realized through the automatic control of the PLC control cabinet: the hydraulic retention time of the circulating composite hydrolytic acidification unit 2 is 8.8 hours, and the total hydraulic retention time of the multistage AO unit 3 and the chemical phosphorus removal unit 5 is 49 hours. The reflux ratio of the hydrolyzed and acidified liquid I is 10-30%, and the sludge age is 15-30 days.
Detailed description of the invention
The present embodiment is a further limitation on the first embodiment. The multistage AO unit 3 includes a plurality of oxygen deficiency ponds 31 and a plurality of good oxygen ponds 32, a plurality of oxygen deficiency ponds 31 and a plurality of good oxygen ponds 32 set up in turn and connect in series and communicate, first oxygen deficiency pond 31 is adjacent to and connects in series with the circulation complex hydrolysis acidification unit 2, first good oxygen pond 32 sets up between first oxygen deficiency pond 31 and second oxygen deficiency pond 31 and around and respectively with first oxygen deficiency pond 31 and second oxygen deficiency pond 31 connect in series and communicate, so set up in turn, last good oxygen pond 32 is adjacent to and connects in series and communicate with sedimentation tank 4. The outlet of the first aerobic tank 32 is provided with a submersible pump II 34, the submersible pump II 34 is communicated with the inlet of the first anoxic tank 31 through a return pipe II 35, the inlet of the last anoxic tank 31 is communicated with the dosing system 9 through a medicament pipe I151, stirring devices I36 are arranged in the first anoxic tank 31 and the last anoxic tank 31, each aerobic tank is provided with an aeration device 37, and the stirring devices I36, the submersible pump II 34 and the aeration devices 37 are electrically connected with the control system 10. The control system 10 controls the starting and stopping of the submersible pump II 34, the stirring device I36 and the aeration device 37.
Further, the first aerobic tank 32 comprises a plurality of tank bodies which are communicated in series, the submersible pump II 34 is arranged at the outlet of the last tank body, and the filler III 38 is arranged in the other tank bodies except the last tank body which is adjacent to the second anoxic tank 31 and communicated in series.
Preferably, the number of the anoxic tanks 31 is two, and the anoxic tanks 31 include a first-stage anoxic tank 311 and a second-stage anoxic tank 312, the number of the aerobic tanks 32 is two, and the aerobic tanks include a first-stage aerobic tank 321 and a second-stage aerobic tank 322, the series connection and communication of the anoxic tanks 31 and the aerobic tanks 32 are sequentially the first-stage anoxic tank 311, the first-stage aerobic tank 321, the second-stage anoxic tank 312 and the second-stage aerobic tank 322, the first-stage aerobic tank 321 includes three series-connected tank bodies, which are respectively a tank body i, a tank body ii and a tank body iii, an inlet of the first-stage anoxic tank 311 is communicated with the circulating composite hydrolysis acidification unit 2, water passing holes iii 313 are respectively arranged at the tail ends of the first-stage anoxic tank 311, the tank body i, the tank body ii, the tank body iii and the second-anoxic tank 312, the water passing holes iii 313 penetrate through tank walls of two adjacent tank bodies, water passing holes iii-i between the first-anoxic tank 311 and the tank, the overflow holes III-III between the pool bodies II and III are arranged at the rear part, the pool body III is positioned at the rear part of the pool body II, therefore, in order to increase the length of the flow passage, the overflow holes III-IV between the pool body III and the secondary anoxic pool 312 are arranged at the rear part, the overflow holes III-V between the secondary anoxic pool 312 and the secondary aerobic pool 322 are arranged at the front part, preferably, the overflow holes III-I, the overflow holes III-III and the overflow holes III-V are all arranged at the bottom part of the pool wall, and the overflow holes III-II and the overflow holes III-IV are arranged at the top part of the pool wall.
The first-stage anoxic tank 311 is internally provided with a filler II 33 with a filling rate of 40-50%, the tank body I and the tank body II are internally provided with a filler III 38 with a filling rate of 50-60%, the filler II 33 and the filler III 38 are both biomembrane fillers, can adopt sponge fillers or composite fillers consisting of polyethylene ball cores, volcanic rocks and polyurethane foams or composite fillers of hydroformylation fibers and polyester yarns, the filler II 33 and the filler III 38 are respectively fixed in the tank bodies of the first-stage anoxic tank 311 and the first-stage aerobic tank 321 through stainless steel brackets, the overall height is 1.5m, and the top of the brackets is 40cm below the highest water level; the filler II 33 has the functions of improving the sludge concentration in the first-stage anoxic tank 311, prolonging the sludge age and strengthening the denitrification effect; the filler III 38 has the functions of improving the sludge concentration of the tank body I and the tank body II, prolonging the sludge age and strengthening the nitrification effect. Stainless steel nets are arranged on the water passing holes III-I, the water passing holes III-II and the water passing holes III-III, so that the filler is prevented from being washed away by sewage; aeration equipment 37 includes aeration pipe 371 and aeration head 372, aeration pipe 371 is laid in the bottom of the pool inside and the intercommunication external world of cell body I, cell body II and cell body III, and aeration head 372 installs on aeration pipe 371, and aeration head 372 provides oxygen for good oxygen pond 32 on the one hand, and on the other hand makes mud and the liquid that is in good oxygen pond 32 remain the mixing state all the time, makes the biomembrane filler be suspension state.
The liquid I which is hydrolyzed and acidified by the circulating composite hydrolysis and acidification unit 2 flows into the first-stage anoxic tank 311, then flows through the tank body I, the tank body II and the tank body III in sequence, part of nitrified liquid flowing out of the tank body III flows back to an inlet of the first-stage anoxic tank 311 through the submersible pump II 34 through the return pipe II 35, the other part flows into the second-stage anoxic tank 312 through the water holes III-IV, the nitrified liquid flowing back to the first-stage anoxic tank 311, the liquid I which is hydrolyzed and acidified and part of sludge flowing back from the sludge storage tank 8 are uniformly mixed through the stirring device I36 in the first-stage anoxic tank 311, denitrification is realized in the first-stage anoxic tank 311 to finish removal of nitrogen elements in the sewage, and removal and nitrification of organic matters are finished in the first-stage aerobic tank 321 comprising the tank body I, the tank body II and the tank body III to oxidize ammonia nitrogen and. The control system 10 controls the dosing system 9 to add an external carbon source at an inlet of the second-stage anoxic tank 312 through the medicament pipe I151, the external carbon source is uniformly stirred by the stirring device I36 in the second-stage anoxic tank 312, the mixed solution realizes complete denitrification in the second-stage anoxic tank 312 to remove nitrogen elements in the sewage, and the addition of the external carbon source can improve the denitrification of the second-stage anoxic tank 312 and strengthen the removal of nitrogen elements; the mixed solution flows into a secondary aerobic tank 322 through a water passing hole III-V, and the removal of organic matters is continuously completed in the secondary aerobic tank 322, so that the advanced treatment of nutrient substances in the sewage is realized; the upper part of the secondary aerobic tank 322 is provided with an overflow weir I39, and liquid II overflowing the overflow weir I39 flows into the sedimentation tank 4 through a communicating pipe I40. The stirring device I36 is a mechanical stirring paddle.
In this embodiment, according to the operation needs, will follow cell body III outflow nitrify liquid reflux ratio and set up to 100%, can adjust nitrify liquid reflux ratio according to the quality of water and the device behavior of intaking, the scope is between 50 ~ 150%.
Detailed description of the invention
The present embodiment is a further limitation on the first embodiment. The sedimentation tank 4 is internally vertically provided with a solid-liquid separator I41 and a sludge bucket I42, the sludge bucket I42 is arranged at the lower end of the solid-liquid separator I41, the sludge bucket I42 is communicated with a sludge storage tank 8 through a sludge suction pipe I111, the sludge bucket I42 is communicated with an inlet of the multistage AO unit 3 through a sludge return pipe 13, the multistage AO unit 3 is communicated with the solid-liquid separator I41 through an overflow weir I39 and a communication pipe I40 which are arranged at an outlet of the multistage AO unit 3, the periphery of the upper part of the sedimentation tank 4 is provided with a peripheral effluent weir I43, a water passing hole IV 44 is arranged on the wall of the sedimentation tank 4 at the periphery of the peripheral effluent weir I43, and the water passing hole IV 44 is communicated with the sedimentation tank 4 and the chemical phosphorus removal unit 5.
Preferably, the height of the sludge hopper I42 is 1m, and the wall of the sludge hopper I42 forms an included angle of 63 degrees with the bottom of the tank.
The liquid II treated by the multistage AO unit 3 flows into a solid-liquid separator I41 through an overflow weir I39 and a communicating pipe I40, and in the solid-liquid separator I41, the liquid II flows in an upflow mode and completes precipitation to realize solid-liquid separation. The solid matter slides into a sludge hopper I42, the supernatant I flows out of a peripheral effluent weir I43 in an overflow mode, then flows into the chemical phosphorus removal unit 5 through a water passing hole IV 44, after the precipitated sludge is sucked out by a sludge pump 14, one part of the precipitated sludge is periodically sucked into a sludge storage tank 8 through a sludge suction pipe I111 for temporary storage, and the other part of the precipitated sludge flows back to an inlet of the multistage AO unit 3 through a sludge return pipe 13.
Detailed description of the invention
This embodiment mode is a further limitation of the third embodiment mode. The chemical phosphorus removal unit 5 comprises a coagulation tank 51 and a phosphorus removal sedimentation tank 52, the sedimentation tank 4 is communicated with the coagulation tank 51, the phosphorus removal sedimentation tank 52 is communicated with a disinfection clean water tank 6, a solid-liquid separator II 53 and a sludge hopper II 54 are vertically arranged in the phosphorus removal sedimentation tank 52, the sludge hopper II 54 is arranged at the lower end of the solid-liquid separator II 53, the sludge hopper II 54 is communicated with a sludge storage tank 8 through a sludge suction pipe II 112, the coagulation tank 51 is communicated with the solid-liquid separator II 53 through an overflow weir II 55 and a communication pipe II 56 which are arranged at the upper end in the coagulation tank 51, a peripheral effluent weir II 57 is arranged at the periphery of the upper part of the phosphorus removal sedimentation tank 52, a water passing hole V59 is arranged on the tank wall of the phosphorus removal sedimentation tank 52 at the periphery of the peripheral effluent weir II 57, the water passing hole V59 is communicated with the phosphorus removal sedimentation tank 52 and the disinfection clean water tank 6, an inlet of the coagulation tank 51 is communicated with a, and a stirring device II 58 is arranged in the coagulation tank 51, the stirring device II 58 is electrically connected with the control system 10, and the control system 10 controls the start and stop of the stirring device II 58. The stirring device II 58 is a mechanical stirring paddle.
Preferably, the height of the sludge bucket II 54 is 1m, and the wall of the sludge bucket I42 forms an included angle of 63 degrees with the bottom of the tank.
The supernatant I precipitated by the sedimentation tank 4 flows into the coagulation tank 51, the control system 10 controls the dosing system 9 to add a coagulant PAC at the inlet of the coagulation tank 51 through the medicament pipe II 152, the coagulant PAC and the supernatant I are uniformly stirred by the stirring device II 58 to coagulate into flocculent substances, the coagulated mixture flows into the solid-liquid separator II 53 in the dephosphorization sedimentation tank 52 through the overflow weir II 55 and the communicating pipe II 56, and the mixture flows in an upflow mode and completes precipitation to realize solid-liquid separation. The solid matter slides into a sludge bucket II 54, the supernatant II flows out of a peripheral effluent weir II 57 in an overflow mode, then flows into the sterilized clean water tank 6 through a water passing hole V59, and the precipitated chemical sludge is periodically sucked away through a sludge suction pipe II 112 and discharged into a sludge storage tank 8 for temporary storage.
Detailed description of the invention
The present embodiment is a further limitation on the first embodiment. Be equipped with immersible pump III 61 in the disinfection clean water basin 6, immersible pump III 61 is connected with the one end of outlet pipe 7, and the other end runs through the pool wall in disinfection clean water basin 6 and stretches out, be provided with the ultraviolet device in the disinfection clean water basin 6, through III 61 and the outlet pipe 7 discharges of immersible pump after the ultraviolet contact disinfection in disinfection clean water basin 6 through supernatant II after the dephosphorization of chemical phosphorus removal unit 5. The control system 10 is electrically connected with the submersible pump III 61 and controls the starting and stopping of the submersible pump III 61.
Detailed description of the invention
The present embodiment is a further limitation on the first embodiment. The device also comprises a deodorization system 16, wherein the deodorization system 16 is respectively communicated with the circulating composite hydrolysis acidification unit 2, the multistage AO unit 3, the sedimentation tank 4, the chemical phosphorus removal unit 5, the disinfection clean water tank 6 and the sludge storage tank 8 through a gas collecting pipe 17.
Further, deodorization system 16 includes between the deodorization and active carbon, the active carbon is placed between the deodorization in, gas collecting pipe 17 collects riser 172 including collecting main 171 and a plurality of, a plurality of collects the equal vertical setting of riser 172 and inserts respectively to circulation complex hydrolysis acidification unit 2, multistage AO unit 3, sedimentation tank 4, chemical phosphorus removal unit 5, disinfection clean water basin 6 and the inside foul smell of collecting in mud storage tank 8, collect main 171 level and set up the upper cover plate upper portion at whole device, a plurality of collects riser 172 and all communicates with collection main 171, collect between main 171 intercommunication deodorization, a plurality of collects riser 172 and collects the foul smell in collecting main 171, transports to the deodorization by collecting main 171 between, adsorbs the processing of foul smell through the active carbon.
Detailed description of the invention
This embodiment mode is a further limitation of the fifth embodiment mode. The dosing system 9 comprises an external carbon source dosing barrel 91, a coagulant dosing barrel 92 and a dosing pipe 93, wherein the external carbon source dosing barrel 91 and the coagulant dosing barrel 92 are arranged in parallel, the dosing pipe 93 is communicated with the external carbon source dosing barrel 91 and the coagulant dosing barrel 92, and the dosing pipe 93 is used for dosing the external carbon source dosing barrel 91 and the coagulant dosing barrel 92; the external carbon source adding barrel 91 is communicated with an inlet of a second-stage anoxic tank 312 of the multistage AO unit 3 through a medicament pipe I151, and supplies an external carbon source to the second-stage anoxic tank 312, wherein the external carbon source is sodium acetate or methanol; the coagulant adding barrel 92 is communicated with an inlet of a coagulation tank 51 of the chemical phosphorus removal unit 5 through a medicament pipe II 152, and a coagulant is supplied to the coagulation tank, wherein the coagulant is PAC. The control system 10 flexibly sets and adjusts the dosage of the external carbon source according to the running state of the secondary anoxic tank 312, and the control system 10 adjusts the dosage of the coagulant according to the concentration of the sewage phosphate in the coagulation tank 51.
Detailed description of the invention
The present embodiment is a further limitation on the first embodiment. The device still includes a plurality of inspection hole 18, a plurality of inspection hole 18 sets up respectively on the top upper cover plate of circulation complex hydrolytic acidification unit 2, multistage AO unit 3, sedimentation tank 4, chemical dephosphorization unit 5, disinfection clean water basin 6 and mud storage tank 8, makes things convenient for the staff to inspect each cell body, and each inspection hole all is provided with the lid, and the lid closes the lid after the staff's inspection finishes.
In the above embodiments, the shapes of the water passing hole i 26, the water passing hole ii 27, the water passing hole iii 313, the water passing hole iv 44 and the water passing hole v 59 are circular, square or any other shapes.
The shape of each pool body is square, round, oval or any other shape.
The material of each pool wall is steel, plastic, glass fiber reinforced plastic or concrete.
Detailed description of the preferred embodiment
A method for treating sewage by using the high-concentration rural sewage treatment device for removing pollutants in a grading way in the first embodiment comprises the following steps:
the method comprises the following steps: the sewage flows into a circulating composite hydrolytic acidification unit 2 through a water inlet pipe 1, a liquid I is obtained after hydrolytic acidification, one part of the liquid I flows into a multistage AO unit 3, and the other part of the liquid I flows back to an inlet of the circulating composite hydrolytic acidification unit 2 to be mixed with the inflow water flowing in through the water inlet pipe 1;
step two: the liquid I flowing into the multistage AO unit 3 is subjected to multistage denitrification-nitrification reaction to obtain liquid II, the liquid II flows into a sedimentation tank 4, after solid-liquid separation, the obtained supernatant I flows into a chemical phosphorus removal unit 5, part of the precipitated sludge flows into a sludge storage tank 8, and part of the precipitated sludge flows back to an inlet of the multistage AO unit 3 to be mixed with the flowing liquid I;
step three: the supernatant I flowing into the chemical phosphorus removal unit 5 is firstly mixed with a coagulant, then solid-liquid separation is carried out, the obtained supernatant II flows into a disinfection clean water tank 6 for disinfection treatment, then the supernatant II is discharged through a water outlet pipe 7, and the precipitated sludge flows into a sludge storage tank 8;
step four: and discharging the sludge in the sludge storage tank 8.
Further, in the second step, an external carbon source is added into the multi-stage AO unit 3 and is uniformly mixed with the liquid therein. The additional carbon source is sodium acetate or methanol.
The invention relates to a method for treating sewage by utilizing an integrated high-concentration rural sewage treatment device for removing pollutants in a three-stage series connection and grading mode aiming at high-concentration domestic sewage, and pollutants are removed in a grading mode by adopting a three-stage series connection process of hydrolytic acidification/multi-stage AO/chemical phosphorus removal. After flowing into the device from the water inlet pipe 1, the high-concentration domestic sewage flows into the first-stage anoxic tank 311 and the first-stage aerobic tank 321 through the hydrolysis acidification tank 21 and the reflux tank 22, then is treated by the second-stage anoxic tank 312 and the second-stage aerobic tank 322, and then flows into the sedimentation tank 4 for sedimentation. After the precipitation, the supernatant I is coagulated with a coagulant in a coagulation tank 51 and then flows into a dephosphorization precipitation tank 52. And finally, the supernatant II after dephosphorization and precipitation flows into a disinfection clean water tank 6, and is discharged by a submersible pump III 61 after disinfection or recycled for farmland irrigation. A submersible pump I24 in the backflow tank 22 is communicated with a backflow pipe I25 to backflow the hydrolysis acidification liquid; a return pipe II 35 in the primary anoxic tank 311 is communicated with the tail end of the primary aerobic tank 321 to return nitrifying liquid, and a sludge return pipe 13 is communicated with the sedimentation tank 4 to return sludge to an inlet of the primary anoxic tank 311; an aeration head 372 in the aerobic tank 32 is communicated with an aeration pipeline 371 to provide oxygen for the aerobic tank 32; the second-stage anoxic tank 312 and the coagulation tank 51 are communicated with the dosing barrel through a medicament pipe 15; the secondary aerobic tank 322 and the coagulation tank 51 both discharge water through an overflow weir, and then are respectively communicated with solid-liquid separators in the sedimentation tank 4 and the dephosphorization sedimentation tank 52 through communicating pipes; the sedimentation tank 4 and the dephosphorization sedimentation tank 52 both discharge water through the peripheral effluent weir, and sludge buckets in the sedimentation tank 4 and the dephosphorization sedimentation tank 52 discharge sludge into the sludge storage tank 8 through the sludge suction pipe 11; the disinfection clean water tank 6 is communicated with the water outlet pipe 7 through a submersible pump III 61, so that the treated sewage is discharged; the whole device collects and treats odor through a deodorization system 16; the pipeline valve, the sludge pump 14 and the control circuit of the submersible pump of the device are connected with the PLC control system, so that automatic operation control is realized. The invention solves the technical requirements of high-COD high-nitrogen and phosphorus sewage high-efficiency treatment, simple maintenance and standard discharge, is suitable for high-concentration rural sewage treatment, and can also be used for treating small-water-volume aquaculture or food processing industry wastewater.
Example 1
The device is applied to rural domestic sewage treatment in a certain area, and domestic sewage and livestock and poultry breeding wastewater in the certain area are mixed and then flow into the device. The water quality of the inlet water is pH 8.15, suspended matter SS 260mg/L, COD 1596mg/L, ammonia nitrogen 173mg/L, total nitrogen 197mg/L and total phosphorus 11 mg/L. During the operation period, the operation working conditions of the device are that the hydraulic retention time of the circulating composite hydrolysis acidification unit 2 is 8.8 hours, and the total hydraulic retention time of the multi-stage AO unit 3 and the chemical phosphorus removal unit 5 is 49 hours. The reflux ratio of the hydrolysis acidification liquid is 10-30%, the reflux ratio of the nitration liquid is 200%, and the sludge age is 15-30 days. After the treatment by the device and the method for removing the graded nutrients, the effluent quality is pH 7.23, suspended substances SS 12mg/L, COD 42mg/L, ammonia nitrogen 3.5mg/L, total nitrogen 11.8mg/L and total phosphorus 0.4 mg/L.
The above-described embodiments are merely illustrative of the present invention and do not limit the scope thereof, and those skilled in the art may make partial changes therein without departing from the spirit of the invention and it is intended to cover all equivalent modifications of the invention within the scope thereof.
Claims (11)
1. The utility model provides a rural sewage treatment plant of high concentration of pollutant is got rid of in grades which characterized in that: including inlet tube (1), circulation complex hydrolysis acidification unit (2), multistage AO unit (3), chemical phosphorus removal unit (5) and outlet pipe (7), along the flow direction of sewage, inlet tube (1), circulation complex hydrolysis acidification unit (2), multistage AO unit (3), chemical phosphorus removal unit (5) and outlet pipe (7) establish ties the intercommunication in proper order.
2. The rural sewage treatment plant of high concentration of hierarchical removal pollutant of claim 1 characterized in that: the device also comprises a sedimentation tank (4), a disinfection clean water tank (6), a sludge storage tank (8), a dosing system (9) and a control system (10), wherein an inlet of the sedimentation tank (4) is communicated with an outlet of the multi-stage AO unit (3), an outlet of the sedimentation tank is communicated with an inlet of the chemical phosphorus removal unit (5), an inlet of the disinfection clean water tank (6) is communicated with an outlet of the chemical phosphorus removal unit (5), an outlet of the disinfection clean water tank is communicated with a water outlet pipe (7), the sedimentation tank (4) and the chemical phosphorus removal unit (5) are both communicated with the sludge storage tank (8) through a sludge suction pipe (11), the sludge storage tank (8) is communicated with the outside through a sludge discharge pipe (12), sludge suction pipes (11) and sludge discharge pipes (12) are both provided with sludge pumps (14), and the dosing system (9) is respectively communicated with the multi-stage AO unit (3) and the chemical phosphorus removal unit (5) through a medicament pipe (15), the sludge pump (14) and the dosing system (9) are electrically connected with the control system (10).
3. The rural sewage treatment plant of high concentration of hierarchical removal pollutant of claim 2 characterized in that: the device also comprises a deodorization system (16), wherein the deodorization system (16) is respectively communicated with the circulating composite hydrolysis acidification unit (2), the multistage AO unit (3), the sedimentation tank (4), the chemical phosphorus removal unit (5), the disinfection clean water tank (6) and the sludge storage tank (8) through a gas collecting pipe (17).
4. The rural sewage treatment plant of high concentration of hierarchical removal pollutant of claim 2 characterized in that: the device also comprises a plurality of inspection holes (18), wherein the inspection holes (18) are respectively arranged on the top upper cover plate of the circulating composite hydrolysis acidification unit (2), the multistage AO unit (3), the sedimentation tank (4), the chemical phosphorus removal unit (5), the disinfection clean water tank (6) and the sludge storage tank (8).
5. The rural sewage treatment plant of high concentration of hierarchical removal pollutant of claim 2 characterized in that: circulation complex hydrolysis-acidification unit (2) is including backward flow pond (22) and a plurality of hydrolysis-acidification pond (21), a plurality of hydrolysis-acidification pond (21) are established ties the intercommunication and all are provided with filler I (23) in it, first hydrolysis-acidification pond (21) and inlet tube (1) intercommunication, and last hydrolysis-acidification pond (21) and backward flow pond (22) intercommunication, backward flow pond (22) and multistage AO unit (3) intercommunication, be provided with immersible pump I (24) in backward flow pond (22), immersible pump I (24) are through the entrance intercommunication of back flow I (25) and first hydrolysis-acidification pond (21), immersible pump I (24) are connected with control system (10) electricity.
6. The rural sewage treatment plant of high concentration of hierarchical removal pollutant of claim 2 characterized in that: the multi-stage AO unit (3) comprises a plurality of anoxic tanks (31) and a plurality of aerobic tanks (32), the plurality of anoxic tanks (31) and the plurality of aerobic tanks (32) are sequentially arranged in turn and are communicated in series, a filler II (33) is arranged in the first anoxic tank (31) and is communicated with the circulating composite hydrolysis acidification unit (2), the last aerobic tank (32) is communicated with the sedimentation tank (4), a submersible pump II (34) is arranged at the outlet of the first aerobic tank (32), immersible pump II (34) are through the entrance intercommunication of back flow II (35) with first oxygen deficiency pond (31), and the entrance of last oxygen deficiency pond (31) is through medicament pipe I (151) and medicine system (9) intercommunication, all is provided with agitating unit I (36) in first oxygen deficiency pond (31) and last oxygen deficiency pond (31), and agitating unit I (36) and immersible pump II (34) all are connected with control system (10) electricity.
7. The rural sewage treatment plant of high concentration of hierarchical removal pollutant of claim 6 characterized in that: the first aerobic tank (32) comprises a plurality of tank bodies which are communicated in series, the submersible pump II (34) is arranged at the outlet of the last tank body, and fillers III (38) are arranged in the rest tank bodies except the last tank body.
8. The rural sewage treatment plant of high concentration of hierarchical removal pollutant of claim 2 characterized in that: the sedimentation tank (4) is internally and vertically provided with a solid-liquid separator I (41) and a sludge hopper I (42), the sludge hopper I (42) is arranged at the lower end of the solid-liquid separator I (41), the sludge hopper I (42) is communicated with a sludge storage tank (8) through a sludge suction pipe I (111), the sludge hopper I (42) is communicated with an inlet of the multistage AO unit (3) through a sludge return pipe (13), the multistage AO unit (3) is communicated with the solid-liquid separator I (41) through an overflow weir I (39) and a communicating pipe I (40) which are arranged at an outlet of the multistage AO unit (3), and the periphery of the upper part of the sedimentation tank (4) is provided with a peripheral effluent weir I (43).
9. The rural sewage treatment plant of high concentration of hierarchical removal pollutant of claim 2 characterized in that: the chemical phosphorus removal unit (5) comprises a coagulation tank (51) and a phosphorus removal sedimentation tank (52), the sedimentation tank (4) is communicated with the coagulation tank (51), the phosphorus removal sedimentation tank (52) is communicated with a disinfection clean water tank (6), a solid-liquid separator II (53) and a sludge hopper II (54) are vertically arranged in the phosphorus removal sedimentation tank (52), the sludge hopper II (54) is arranged at the lower end of the solid-liquid separator II (53), the sludge hopper II (54) is communicated with a sludge storage tank (8) through a sludge suction pipe II (112), the coagulation tank (51) is communicated with the solid-liquid separator II (53) through an overflow weir II (55) and a communicating pipe II (56) which are arranged at the upper end in the coagulation tank (51), the periphery of the upper part of the phosphorus removal sedimentation tank (52) is provided with a peripheral effluent weir II (57), the inlet of the coagulation tank (51) is communicated with a medicine adding system (9) through a medicine II (152), and a stirring device II (58) is arranged in the coagulation tank (51), and the stirring device II (58) is electrically connected with the control system (10).
10. A treatment method of a high-concentration rural sewage treatment plant for removing pollutants in a grading way according to any one of claims 2 to 9, which is characterized by comprising the following steps:
the method comprises the following steps: the sewage flows into a circulating composite hydrolytic acidification unit (2) through a water inlet pipe (1), a liquid I is obtained after hydrolytic acidification, one part of the liquid I flows into a multistage AO unit (3), and the other part of the liquid I flows back to an inlet of the circulating composite hydrolytic acidification unit (2) to be mixed with the sewage flowing in through the water inlet pipe (1);
step two: the liquid I flowing into the multistage AO unit (3) is subjected to multistage denitrification-nitrification reaction to obtain liquid II, the liquid II flows into a sedimentation tank (4), after solid-liquid separation, the obtained supernatant I flows into a chemical phosphorus removal unit (5), part of the precipitated sludge flows into a sludge storage tank (8), and part of the precipitated sludge flows back to an inlet of the multistage AO unit (3) to be mixed with the flowing liquid I;
step three: supernatant I flowing into the chemical phosphorus removal unit (5) is firstly mixed with a coagulant, then solid-liquid separation is carried out, the obtained supernatant II flows into a disinfection clean water tank (6) for disinfection treatment, then the supernatant II is discharged through a water outlet pipe (7), and the precipitated sludge flows into a sludge storage tank (8);
step four: and discharging the sludge in the sludge storage tank (8) outside.
11. The processing method according to claim 10, characterized in that: in the second step, an external carbon source is added into the multi-stage AO unit (3) and is uniformly mixed with the liquid in the multi-stage AO unit.
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