CN115028265A - Device and method for treating urban sewage by continuous flow sectional water inlet coupling pretreatment and fermented sludge sectional backflow reinforcement PD/A - Google Patents

Device and method for treating urban sewage by continuous flow sectional water inlet coupling pretreatment and fermented sludge sectional backflow reinforcement PD/A Download PDF

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CN115028265A
CN115028265A CN202210717064.8A CN202210717064A CN115028265A CN 115028265 A CN115028265 A CN 115028265A CN 202210717064 A CN202210717064 A CN 202210717064A CN 115028265 A CN115028265 A CN 115028265A
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sludge
sectional
fermentation
tank
anoxic
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彭永臻
侯晓航
李夕耀
考成坤
王淑莹
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Beijing University of Technology
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • 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
    • C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
    • 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
    • C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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Abstract

A device and a method for treating urban sewage by continuous flow sectional water inlet coupling pretreatment and fermentation sludge sectional backflow reinforcement PD/A belong to the field of sewage treatment. The device comprises a raw water tank, a continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow PD/A reactor, a vertical flow sedimentation tank and the like; at 400-500 m 2 /m 3 Anaerobic ammonia oxidation is realized in the biomembrane with the filling ratio of 30-50% of the filler, short-range denitrification is realized in floc sludge, the device has strong stability, and the efficiency is greatly improved; raw water enters each anoxic section in a segmented mode, and carbon sources in the raw water are utilized to carry out short-cut denitrification to generate NO for anaerobic ammonia oxidation reaction 3 ‑ -N and NH 4 + -N; and (3) refluxing the sludge in the secondary sedimentation tank, supplementing a carbon source required by denitrification, and saving the addition of an external carbon source. The residual sludge enters a fermentation tank for fermentation after being subjected to gravity concentration from an aerobic zone to a concentration tankThen the wastewater enters an intermediate water tank after being pretreated and dephosphorized by a regulating tank, and flows back to each anoxic zone in a segmented manner to provide carbon source and nitrate nitrogen required by short-range denitrification and maintain the sludge concentration in the device.

Description

Device and method for treating urban sewage by continuous flow sectional water inlet coupling pretreatment and fermented sludge sectional backflow reinforcement PD/A
Technical Field
The invention relates to the field of biological sewage treatment, in particular to a device and a method for treating urban sewage by strengthening PD/A through continuous flow and sectional water inlet coupling pretreatment of fermented sludge and sectional backflow.
Background
Along with the continuous development of economy in China, the living standard of residents is continuously improved, the yield of urban domestic sewage is increased year by year, pollutants such as nitrogen, phosphorus and the like in the domestic sewage can cause great harm to the environment, the typical expression is that water eutrophication phenomena with different degrees occur in a plurality of domestic lakes, the water quality of the lakes is seriously influenced, the environment is further influenced, and the harm is brought to the health of human beings. In order to avoid domestic sewage from being directly discharged into the ecological environment, China increases the strength to build a batch of sewage treatment plants, and aims to discharge urban domestic sewage into the water body in the nature after the urban domestic sewage is treated by the sewage treatment plants, so that the bearing pressure of the natural environment is relieved. At present, a sewage treatment plant mainly uses a traditional mainstream process, nitrogen is removed by means of nitrification-denitrification reaction, although some water plants apply anaerobic ammoxidation reaction, the denitrification of the anaerobic ammoxidation reaction is not realized in the mainstream, and biodegradable organic matters in domestic sewage are insufficient to provide a carbon source required by denitrification in the traditional method, so that in an actual sewage plant, additional sodium acetate, ethanol and other carbon sources are added to ensure the normal operation of the denitrification reaction, which greatly increases the operation cost of the water plant. With the improvement of the national sewage discharge standard, the traditional process obviously cannot reach the discharge standard, and under the new historical challenge, the development of a new energy-saving, high-efficiency and environment-friendly sewage treatment process is urgently needed.
The discovery of anammox bacteria points out a new way for the technical innovation in the field of sewage treatment, and compared with the traditional denitrification process, the anammox process has the remarkable advantages that: (1) compared with the traditional process, the aeration quantity is saved by about 60 percent; (2) the anaerobic ammonium oxidation bacteria are autotrophic bacteria, and no additional carbon source is required, so that almost 100% of carbon source is saved, and secondary pollution is avoided; (3) when the anaerobic ammonia oxidation process is actually adopted, the anaerobic ammonia oxidation process is mostly in the form of granular sludge or a biological membrane, the hydraulic retention time is short, the sewage treatment load is relatively high, and the occupied area of the process is small.
The current research on the anaerobic ammonia oxidation process mainly has several characteristics: (1) the research on high ammonia nitrogen wastewater such as landfill leachate and the like is relatively mature, and the method is also applied to actual production; (2) the research on low ammonia nitrogen wastewater such as municipal domestic sewage is very extensive, and a lot of intensive research is also carried out, but the low ammonia nitrogen wastewater is not applied to the mainstream process of an actual sewage treatment plant; (3) the existing research focus and difficulty of the anaerobic ammonia oxidation process of the low ammonia nitrogen wastewater lies in the realization and stable maintenance of the shortcut nitrification reaction; (4) the main limitation of the application of the anaerobic ammonia oxidation process to the urban domestic sewage is that the urban domestic sewage has the characteristics of large water quantity, large water quality fluctuation, low winter sewage temperature and the like.
Therefore, the technical problem at present is the realization and stable maintenance of the shortcut nitrification reaction, but the realization and stable maintenance of the shortcut nitrification reaction are the essence of the shortcut nitrification reaction, and the realization and stable accumulation of nitrite nitrogen, continuous flow subsection water inlet, subsection reflux of pretreated fermented sludge, shortcut denitrification/synchronous anaerobic ammonia oxidation dephosphorization domestic sewage treatment system, subsection inlet of raw water and subsection reflux of pretreated fermented sludge to an anoxic zone, anaerobic ammonia oxidation bacteria on a biomembrane in the anoxic zone perform anaerobic ammonia oxidation reaction to reduce total nitrogen, nitrate nitrogen generated in the reflux sludge and the anaerobic ammonia oxidation reaction is further shortcut denitrification by utilizing a carbon source in the raw water and the refluxed fermented sludge, the generated nitrite is supplied for the anaerobic ammonia oxidation reaction, and can be directly denitrified into nitrogen, and the high-efficiency, environment-friendly and energy-saving treatment of municipal sewage is finally realized. In order to solve the technical problems, the invention provides a continuous flow sectional water inlet and pretreated fermented sludge sectional reflux short-cut denitrification/anaerobic ammonia oxidation synchronous dephosphorization domestic sewage treatment system, wherein the aerobic section of the process is controlled to maintain an aeration state to realize stable nitrification by WTW online monitoring of the dissolved oxygen concentration in a grid, a movable polyethylene filler is placed in the anoxic section to facilitate long-term retention of anaerobic ammonia oxidation bacteria by hanging a membrane, nitrate nitrogen generated by anaerobic ammonia oxidation and sludge sectional reflux is subjected to further short-cut denitrification by utilizing raw water and a carbon source in pretreated fermented sludge in a sectional water inlet mode, and finally the stable and efficient operation of the short-cut denitrification/anaerobic ammonia oxidation in the system is realized.
Disclosure of Invention
Aiming at the characteristics that the substrate source of the anaerobic ammonia oxidizing bacteria is unstable and is difficult to enrich and retain due to the influence of external environments such as dissolved oxygen, the invention provides a method for improving sufficient substrates for the anaerobic ammonia oxidizing bacteria by a sectional water inlet short-range denitrification mode. Meanwhile, the carbon-nitrogen ratio in the domestic sewage is supplemented through fermentation pretreatment and segmented reflux of the excess sludge in the reactor, and short-range denitrification is promoted to stably provide NO 2 - N sustains the anammox reaction. On the other hand, the polyethylene is added to fix the filler, so that the retention capacity of the anaerobic ammonium oxidation bacteria in the reactor is greatly improved, and good precondition is provided for further deep nitrogen and phosphorus removal.
The invention provides a device and a method for treating urban sewage by coupling continuous flow sectional water inlet with pretreatment of fermented sludge sectional backflow reinforcement PD/A (photo-oxidative/oxidative) based on nitrite production short-cut denitrification technology, anaerobic ammonia oxidation autotrophic nitrogen removal technology and sludge hydrolysis acidification fermentation technology, and realizes deep and efficient nitrogen and phosphorus removal and sludge resource utilization of urban low C/N ratio domestic sewage.
The purpose of the invention is realized by the following technical scheme:
the device and the method for treating urban sewage by coupling the follow current stage water inlet with the pretreatment of the fermented sludge and the stage reflux reinforcement of PD/A are characterized in that the device comprises: a domestic sewage raw water tank (1), a fermented sludge segmented reflux enhanced short-cut denitrification/anaerobic ammonia oxidation synchronous dephosphorization reactor (2), a sedimentation tank (3) and a fermentation system (4);
the method comprises the following steps that municipal domestic sewage is pumped into a PD/A synchronous dephosphorization reactor (2) at the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow strengthening position by a water inlet pump (2-1), a sedimentation tank (3) is connected with first grids of anoxic zones of the PD/A synchronous dephosphorization reactor (2) at the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow strengthening position by a water outlet pipe (3-1), a fermentation system (4) enters a concentration tank control pump (4-1) through backflow sludge and is connected with first grids of anoxic zones of the PD/A synchronous dephosphorization reactor (2) at the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow strengthening position by a water inlet pump (2-1).
The method for applying the device is characterized by comprising the following steps:
1) the process is started:
1.1) adding the denitrification sludge into a continuous flow stage water inlet coupling pretreatment fermentation sludge stage reflux reinforced PD/A synchronous phosphorus removal reactor (2), controlling the water inlet ratio of each stage to be 4:3:3, and controlling the sludge reflux ratio to be 100-150%, so that the mass concentration MLSS of the sludge in the reactor is 4000-5000 mg/L; sodium acetate is added into a domestic sewage raw water tank (1) in the initial stage, so that the C/N ratio is about 2.5-3, and short-range denitrification is realized in an anoxic zone; controlling DO of an aerobic section to be 2-3mg/L by monitoring the dissolved oxygen concentration in each cell on line through WTW, and simultaneously adjusting HRT to be 12-16 h by controlling the water inflow of each section; adding polyethylene filler with a suspended anaerobic ammonia oxidation biological membrane in an anoxic zone after short-cut denitrification condition occurs when the NTR (nitrite accumulation rate) of the system reaches above 40%.
1.2) discharging 5% of residual sludge of the volume of the reactor every day, entering a concentration tank for precipitation for 11h, discharging supernatant with the water discharge ratio of 50%, entering the concentrated sludge into a fermentation tank for fermentation, controlling the pH to be 10-11 by NaOH and controlling the fermentation time to be 6d-7d, then entering an adjusting tank and adding 9.5 g/L-19 g/L MgCl 2 So that MgCl is contained in the fermentation tank 2 The concentration is controlled between 0.95g/L and 1.9g/L for pretreatment to recover phosphorus. After the pretreated fermented sludge is precipitated, supernatant enters an intermediate water tank and then flows back to an anoxic grid in a segmented manner. The reflux ratio of the pretreated fermented sludge refluxed to each anoxic section is 4:3: 3.
1.3) when the NTR (nitrite accumulation rate) of the system is more than 40 percent, the short-range denitrification is started successfully, the polyethylene filler hung with the anaerobic ammonia oxidation biomembrane is placed in each anoxic grid, the sodium acetate is stopped being added into the raw water tank, and when the effluent of the three anoxic grids flows outNH 4 + N concentration less than 1mg/L, NO 2 - -N concentration less than 2mg/L, NO 3 - And when the-N is less than 3mg/L, finishing the starting of the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow reinforced PD/A synchronous phosphorus removal reactor.
2) After the reactor is successfully started, the system is formally operated, raw water enters three anoxic grids in three sections, pretreated fermented sludge flows back to the three anoxic grids in sections, the aerobic grids are subjected to full-process nitration reaction, the concentration of dissolved oxygen in each grid chamber is monitored on line by WTW (WTW) to adjust the aeration rate of the aerobic section, and HRT (Rockwell temperature) is adjusted through water inflow, so that the aerobic grids flow into the anoxic grids and NO in sewage mixed liquid in the backflow of pretreated fermented sludge 3 - -N and NH 4 + The mass concentration ratio of N to N is 1-1.5, then the mixture enters three anoxic chambers to carry out anaerobic ammonia oxidation reaction, and in the anoxic chambers with filling, a small amount of NO is generated due to anaerobic ammonia oxidation 3 - -N and the return sludge contains a large amount of NO 3 - -N converts it to NO by short-cut denitrification 2 - -N and NH in raw water 4 + And carrying out anaerobic ammoxidation reaction on the N to sufficiently reduce the total nitrogen in the mixed liquor.
The device and the method for treating domestic sewage by continuous flow segmented water inlet and pretreated fermented sludge segmented reflux enhanced short-cut denitrification/anaerobic ammonia oxidation synchronous dephosphorization, provided by the invention, have the following advantages:
1) in conclusion, the device for treating domestic sewage by continuous flow sectional water inlet and sectional reflux short-range denitrification/anaerobic ammonia oxidation synchronous dephosphorization for pretreated fermented sludge, provided by the invention, applies short-range denitrification and anaerobic ammonia oxidation to deep denitrification treatment of domestic sewage, and compared with the traditional denitrification process, the oxygen consumption is reduced by 60%. Short-cut denitrification is mainly utilized to provide nitrite nitrogen, short-cut denitrification-anaerobic ammonia oxidation, short-cut nitrification-anaerobic ammonia oxidation and denitrification are utilized to comprehensively and deeply denitrify, the operation is simple, and the operation cost and energy are saved;
2) denitrifying bacteria and anaerobic ammonium oxidation bacteria respectively exist in the system in the forms of activated sludge and biological membranes, so that the competition contradiction of the denitrifying bacteria and the anaerobic ammonium oxidation bacteria in a single sludge system is overcome, and the stable and efficient operation of the short-cut denitrifying and anaerobic ammonium oxidation in the system is finally realized;
3) by fermenting and pretreating the sludge, the COD content in the sludge is greatly enhanced, the nitrogen load and the phosphorus load in the sludge are reduced, and the treatment effect is improved;
4) the method and the device do not need to change the original structure and can be used for upgrading and reconstruction.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention:
as shown in the schematic structural diagram of fig. 1, 1-a domestic sewage raw water tank; 2-coupling continuous flow sectional water inlet with pretreated fermented sludge sectional backflow to strengthen a PD/A synchronous phosphorus removal reactor; 3-a sedimentation tank; 4-a fermentation system; 1.1-overflow pipe; 1.2-a blow-down pipe; 2.1-water inlet pump; 2-2 is a total water inlet pump pipe; 2-3 is a water inlet stop valve; 2-4 is a sectional water inlet pump pipe; 2-5 is a stirrer; 2-6 is anoxia lattice; 2-7 is an aerobic grid; 2-8 is anoxia grid; 2-9 is an aerobic grid; 2-10 is anoxia lattice; 2-11 is an aerobic grid; 2-12 are water outlet pipes; 2-13 is polyethylene filler; 2-14 is an aeration head; 2-15 is an aeration valve; 2-16 is an air pump connecting pipe; 2-17 is a gas flowmeter; 2-18 is an air pump; 3-1 is a water outlet pipe; 3-2 is an overflow weir; 3-3 is a water outlet of the sedimentation tank; 3-4 is a sludge reflux valve; 3-5 is a sludge reflux pump; 3-6 is a sludge return pipe; 3-7 is a mud valve; 4-1 is a control pump for feeding the return sludge into a concentration tank; 4-2 is a concentration tank; 4-3, concentrated sludge enters a fermentation tank control pump; 4-4 is a fermentation tank; 4-5 is a temperature controller; 4-6 is a dissolved oxygen monitoring probe; 4-7 is a pH monitoring probe; 4-8 is a control pump for feeding the fermented sludge into a regulating tank; 4-9 is a regulating tank; 4-10 is a control pump for the pretreated sludge entering the intermediate water tank; 4-11 is an intermediate water tank; 4-12 is a main pipe for pretreating the fermented sludge; 4-13 is a pretreated sludge reflux pump
Detailed Description
The invention is described in detail with reference to the accompanying drawings and examples.
The device for treating domestic sewage by continuous flow sectional water feeding and pretreated fermented sludge sectional reflux enhanced short-cut denitrification/anaerobic ammonia oxidation synchronous dephosphorization is characterized by comprising the following steps: domestic sewage raw water tank (1), overflow pipe (1-1), blow-down pipe (1-2), continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional reflux enhanced PD/A synchronous dephosphorization reactor (2), water inlet pump (2-1), total water inlet pump pipe (2-2), water inlet stop valve (2-3), sectional water inlet pump pipe (2-4), stirrer (2-5), anoxic grid (2-6), aerobic grid (2-7), anoxic grid (2-8), aerobic grid (2-9), anoxic grid (2-10), aerobic grid (2-11), water outlet pipe (2-12), polyethylene filler (2-13), aeration head (2-14), aeration valve (2-15), air pump connecting pipe (2-16), The device comprises a gas flow meter (2-17), an air pump (2-18), a sedimentation tank (3), a water outlet pipe (3-1), an overflow weir (3-2), a sedimentation tank water outlet (3-3), a sludge reflux valve (3-4), a sludge reflux pump (3-5), a sludge reflux pipe (3-6), a sludge discharge valve (3-7), a fermentation system (4), a concentration tank (4-2), a concentrated sludge inlet fermentation tank control pump (4-3), a fermentation tank (4-4), a temperature controller (4-5), a dissolved oxygen monitoring probe (4-6), a pH monitoring probe (4-7), a fermented sludge inlet regulation tank control pump (4-8), a regulation tank (4-9), a pretreated sludge inlet intermediate water tank control pump (4-10), The system comprises an intermediate water tank (4-11), a pretreatment fermentation sludge main pipe (4-12) and a pretreatment sludge return pump (4-13); the method comprises the following steps that an intake pump (2-1) pumps urban domestic sewage into a PD/A synchronous dephosphorization reactor (2) at the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow strengthening position, a sedimentation tank (3) is connected with first grids of anoxic zones of the PD/A synchronous dephosphorization reactor (2) at the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow strengthening position through a water outlet pipe (3-1), and a fermentation system (4) enters a concentration tank control pump (4-1) through backflow sludge and is connected with first grids of anoxic zones of the PD/A synchronous dephosphorization reactor (2) at the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow strengthening position.
The method of claim 1, comprising the steps of:
1) the process is started:
1.1) adding the denitrification sludge into a continuous flow stage water inlet coupling pretreatment fermentation sludge stage reflux enhanced PD/A synchronous phosphorus removal reactor (2), and controlling the water inlet ratio of each stage to be 4:3: 3; sodium acetate is added into a domestic sewage raw water tank (1) in the initial stage, so that the C/N ratio is about 2.5-3, and short-range denitrification is realized in an anoxic zone; the DO of the aerobic section is controlled to be 2-3mg/L by monitoring the dissolved oxygen concentration in each grid chamber on line through WTW, and meanwhile, the HRT is adjusted to be 12-16 h by controlling the water inflow of each section, so that the coupling of short-cut denitrification and anaerobic ammonia oxidation is better realized; after the short-range denitrification condition occurs, polyethylene filler with an anaerobic ammonia oxidation biological membrane is added in the anoxic zone.
1.2) discharging 5% of residual mud out of the reactor volume every day, allowing the residual mud to enter a concentration tank for precipitation for 11h, discharging supernatant with a water discharge ratio of 50%, allowing the concentrated mud to enter a fermentation tank for fermentation, controlling the pH to be 10-11 by NaOH and the fermentation time to be 6d-7d, allowing the concentrated mud to enter an adjusting tank, and adding 9.5 g/L-19 g/L of MgCl 2 So that MgCl is contained in the fermentation tank 2 The concentration is controlled between 0.95g/L and 1.9g/L for pretreatment to recover phosphorus. After the pretreated fermented sludge is precipitated, supernatant enters an intermediate water tank and then flows back to the anoxic grid in sections. The reflux ratio of the pretreated fermented sludge refluxed to each anoxic section is 4:3: 3.
1.3) when the NTR (nitrite accumulation rate) of the system reaches more than 40 percent, the short-range denitrification is started successfully, the polyethylene filler hung with the anaerobic ammonia oxidation biomembrane is placed in each anoxic grid, the sodium acetate is stopped being added into the raw water tank, and when the effluent NH of the three anoxic grids 4 + -N concentration less than 1mg/L, NO 2 - -N concentration less than 2mg/L, NO 3 - And completing the starting of the continuous flow sectional water inlet and the pretreated fermented sludge sectional reflux reinforced short-cut denitrification/anaerobic ammonia oxidation reactor when the-N is less than 3 mg/L.
2) After the reactor is successfully started, the system formally operates, raw water enters three anoxic grids in three sections, pretreated fermented sludge flows back to the three anoxic grids in sections, full-process nitration reaction is carried out in the aerobic grids, the concentration of dissolved oxygen in each grid chamber is monitored on line through WTW (WTW) to adjust the aeration rate of the aerobic section, HRT (Rockwell temperature) is adjusted in 12-16 h through water inflow, and sewage flowing into the anoxic grids from the aerobic grids and NO (nitric oxide) in mixed liquid obtained after the reflux of the pretreated fermented sludge 3 - -N and NH 4 + The mass concentration ratio of N is 1-1.5, and then the anaerobic cell enters three anoxic cells to be anaerobicAmmoxidation reaction, in a packed anoxic cell, a small amount of NO is produced due to the anammox 3 - N and the returned sludge contains a large amount of NO 3 - -N converts it to NO by short-cut denitrification 2 - N and NH in the raw water 4 + And carrying out anaerobic ammoxidation reaction on the N to sufficiently reduce the total nitrogen in the mixed liquor.

Claims (2)

1. The device for strengthening PD/A treatment of urban sewage by coupling continuous flow subsection water inlet with fermentation sludge subsection reflux is characterized by comprising the following steps: a domestic sewage raw water tank (1), a fermentation sludge segmented reflux enhanced PD/A synchronous dephosphorization reactor (2), a sedimentation tank (3) and a fermentation system (4);
urban domestic sewage is pumped from a domestic sewage raw water tank (1) into a continuous flow sectional water inlet coupling pretreatment sludge sectional backflow PD/A synchronous dephosphorization reactor (2) by a water inlet pump (2-1); the PD/A synchronous dephosphorization reactor (2) for continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional reflux comprises a water inlet pump (2-1), a total water inlet pump pipe (2-2), a water inlet stop valve (2-3), a sectional water inlet pump pipe (2-4), a stirrer (2-5), an anoxic grid (2-6), an aerobic grid (2-7), an anoxic grid (2-8), an aerobic grid (2-9), an anoxic grid (2-10), an aerobic grid (2-11), a water outlet pipe (2-12), polyethylene fillers (2-13), an aeration head (2-14), an aeration valve (2-15), an air pump connecting pipe (2-16), a gas flowmeter (2-17) and an air pump (2-18); the sedimentation tank (3) is connected with first grids of anoxic zones of the continuous flow sectional water inlet and fermentation sludge sectional reflux PD/A synchronous dephosphorization reactor (2) through a water outlet pipe (3-1), and comprises a water outlet pipe (3-1), an overflow weir (3-2), a sedimentation tank water outlet (3-3), a sludge reflux valve (3-4), a sludge reflux pump (3-5), a sludge reflux pipe (3-6) and a sludge discharge valve (3-7); the fermentation system (4) enters a control pump (4-1) of a concentration tank through the returned sludge and is connected with a continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional return PD/A synchronous dephosphorization reactor (2) in each anoxic zone, and the first grid is connected. The residual sludge enters a concentration tank control pump (4-1), the fermentation system comprises a return sludge entering concentration tank control pump (4-1), a concentration tank (4-2), a concentrated sludge entering fermentation tank control pump (4-3), a fermentation tank (4-4), a temperature controller (4-5), and dissolved oxygen monitoringThe device comprises a probe (4-6), a pH monitoring probe (4-7), a fermentation sludge inlet regulating tank control pump (4-8), a regulating tank (4-9), a pretreatment sludge inlet intermediate water tank control pump (4-10), an intermediate water tank (4-11), a pretreatment fermentation sludge main pipe (4-12) and a pretreatment sludge return pump (4-13). The continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional reflux short-cut denitrification/anaerobic ammonia oxidation synchronous phosphorus removal reactor (2) is divided into 11 grid chambers, and an anaerobic grid, an anoxic grid, an aerobic grid, an anoxic grid, an aerobic grid and an aerobic grid are sequentially arranged; the mud-water mixed liquid sequentially passes through the grid chambers in a plug flow mode; the anoxic grid of the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional reflux short-cut denitrification/anaerobic ammonia oxidation synchronous phosphorus removal reactor is filled with fixed polyethylene filler with the specific surface area of 400-500 m 2 /m 3 The filling ratio is 30% -50%; the sewage mixed liquid of the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow reinforced short-cut denitrification/anaerobic ammonia oxidation synchronous dephosphorization reactor (2) enters a vertical flow type sedimentation tank (3) through a water outlet pipe (3-1) in a gravity flow mode; and carrying out mud-water separation in the vertical sedimentation tank, discharging the supernatant out of the system through a water outlet, and refluxing the bottom activated sludge to the anaerobic zone.
2. A method for using the apparatus of claim 1, comprising:
adding the excess sludge of the reactor into a continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow strengthening PD/A synchronous phosphorus removal reactor (2), connecting raw water with first grid chambers of anoxic zones of the continuous flow sectional water inlet coupling pretreatment fermentation sludge sectional backflow strengthening PD/A synchronous phosphorus removal reactor (2) through a water inlet pump (2-1), and controlling the water inlet quantity ratio of each section to be 4:3: 3; controlling the sludge reflux ratio to be 100-150%, discharging 5% of the volume of the reactor per day of residual sludge, entering a concentration tank for precipitation for 11h, releasing phosphorus from phosphorus-accumulating bacteria under an anoxic condition, discharging supernatant, controlling the water discharge ratio to be 50%, entering the concentrated sludge into a fermentation tank for fermentation, controlling the pH to be 10-11 by NaOH, controlling the fermentation time to be 6d-7d, entering an adjusting tank, and adding 9.5 g/l-19 gMgCl of/L 2 So that MgCl is contained in the fermentation tank 2 The concentration is controlled between 0.95g/L and 1.9g/L for pretreatment to recover phosphorus. After the pretreated fermented sludge is precipitated, supernatant enters an intermediate water tank and then flows back to an anoxic grid in a segmented manner. The reflux ratio of the pretreated fermentation sludge refluxed to each anoxic zone is 4:3:3, so that the mass concentration MLSS of the sludge in the reactor is 4000-5000 mg/L; sodium acetate is added into a raw water tank in the initial stage to ensure that the C/N ratio is 2.5-3, so that short-range denitrification is realized in an anoxic zone; the DO of the aerobic section is controlled to be 2-3mg/L through an on-line monitoring and feedback system, and the HRT is adjusted by controlling the water inflow of each section, so that the sewage flowing into the anoxic section from the aerobic section and the NO in the mixed liquid obtained after the return of the pretreated fermented sludge 3 - -N and NH 4 + -the ratio of the mass concentration of N is between 1 and 1.5; adding polyethylene filler with a hung anaerobic ammonia oxidation biological membrane in an anoxic zone after short-cut denitrification occurs when the accumulation rate of nitrite in the system NTR (nitrite) reaches more than 40%;
after the PD/A synchronous dephosphorization reactor for the sectional backflow of the pretreated fermented sludge is successfully started, the system is formally operated, raw water enters three anoxic grids in three sections, the pretreated fermented sludge flows back to the three anoxic grids in sections, the whole course nitration reaction is carried out in the aerobic grids, the dissolved oxygen concentration of the grid chamber connected with each gallery is monitored to adjust the aeration amount of the aerobic section, the HRT is adjusted in 12-16 h through the water inflow, and the NO in the mixed liquid of the sewage flowing into the anoxic grids from the aerobic grids and the pretreated fermented sludge after the backflow is enabled to be 3 - -N and NH 4 + The mass concentration ratio of N to N is 1-1.5, and then the anaerobic ammonia oxidation reaction is carried out in three anoxic chambers.
CN202210717064.8A 2022-06-23 2022-06-23 Device and method for treating urban sewage by continuous flow sectional water inlet coupling pretreatment and fermented sludge sectional backflow reinforcement PD/A Pending CN115028265A (en)

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