CN109354171B - High-efficiency autotrophic nitrogen removal system based on MBBR and operation method - Google Patents

High-efficiency autotrophic nitrogen removal system based on MBBR and operation method Download PDF

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CN109354171B
CN109354171B CN201811477694.2A CN201811477694A CN109354171B CN 109354171 B CN109354171 B CN 109354171B CN 201811477694 A CN201811477694 A CN 201811477694A CN 109354171 B CN109354171 B CN 109354171B
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reaction tank
water
tank
water inlet
water outlet
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CN109354171A (en
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吴迪
韩文杰
周家中
管勇杰
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Qingdao Spring Water Processing Co ltd
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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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/121—Multistep 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
    • 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
    • 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
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • 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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  • Environmental & Geological Engineering (AREA)
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Abstract

The invention discloses an efficient autotrophic nitrogen removal system based on MBBR (moving bed biofilm reactor) and an operation method, belonging to the technical field of biological nitrogen removal of wastewater. Solves the problems of excessive related inoculation amount, long starting time, low denitrification efficiency, easy influence of water inlet organic matters on the system and the like in the prior art. The invention couples the same-stage autotrophic nitrogen removal of denitrification, leads a denitrification tank to be arranged in front, leads the effluent of the autotrophic nitrogen removal to flow back, realizes the removal of nitrate and organic matters in the first stage, and carries out the autotrophic nitrogen removal in the second stage. The invention can realize three operation modes, namely a parallel operation mode, a double-series A operation mode and a double-series B operation mode, and realizes the serial, parallel or independent operation of the reaction tanks by controlling the water outlet directions of the four reaction tanks through the communicating valves; the autotrophic nitrogen removal process is quickly started by means of inoculation, fed-batch and the like; different process arrangements are realized according to the treatment requirements. The invention has the advantages of small inoculation ratio, quick start, high denitrification efficiency, good tolerance to influent organic matters and the like.

Description

High-efficiency autotrophic nitrogen removal system based on MBBR and operation method
Technical Field
The invention belongs to the technical field of biological denitrification of wastewater, and particularly relates to an efficient autotrophic denitrification system based on MBBR and an operation method.
Background
In the 90 s of the 20 th century, when the phenomenon of anaerobic ammonia oxidation is discovered, people are aware of a novel autotrophic nitrogen removal process, under the anoxic condition, microorganisms represented by bacteria of the order Aphyllophorales directly use nitrite as an electron acceptor, carbon dioxide is used as a main carbon source, and ammonia nitrogen is oxidized into nitrogen, because the traditional biological nitrogen removal process usually limits the nitrogen removal performance due to lack of the carbon source when treating high-ammonia nitrogen low-C/N wastewater, organic matters are additionally added, so that the operation cost is increased, secondary pollution risk is easy to cause, the safe and economical operation of a system is not facilitated, the autotrophic nitrogen removal process has more points compared with the traditional nitrification and denitrification process, firstly, partial nitrosation is needed for anaerobic ammonia oxidation reaction in the autotrophic nitrogen removal process as a pretreatment process, and 62.5 percent of supply power consumption can be theoretically saved according to the stoichiometric relationship, and the organic carbon source does not need to be added additionally, the operating cost increased by 100% of the additional carbon source is saved, the sludge yield is low, the sludge disposal cost is saved, and finally, the excessive emission of greenhouse gases such as carbon dioxide and the like can be reduced, but carbon dioxide can be consumed, however, the theoretical total nitrogen removal rate of the autotrophic nitrogen removal process is 89%, and the project with high requirement on the total nitrogen of the effluent can not ensure that the effluent reaches the standard.
In order to further improve the total nitrogen removal rate, the denitrification coupling autotrophic nitrogen removal technology is widely concerned by people, the main process forms are pre-denitrification and post-denitrification, most of wastewater contains a part of organic carbon source in inlet water, when the post-combination form is utilized, organic matters enter the autotrophic nitrogen removal stage firstly, and may affect the autotrophic nitrogen removal stage, so that researchers can pre-arrange the denitrification stage and set outlet water backflow to realize the removal of nitrate and organic matters in the first stage, compared with the post-denitrification, the combination form is easier to control the outlet water organic matters, can remove most of organic matters through the regulation and control of aeration amount or dissolved oxygen in an autotrophic nitrogen removal zone and improve the total nitrogen removal rate, however, most of the prior pre-denitrification processes adopt granular sludge or anoxic sludge, and the outlet water needs to be subjected to mud-water separation, the long-term operation easily leads to the sludge output too big, needs often to arrange mud, and in addition, mud easily gets into follow-up processing system along with the play water and produces the influence to follow-up technology, and takes place the mud inflation phenomenon easily, therefore is difficult to long-term stable operation. Compared with the activated sludge process, the pre-denitrification process of the biofilm process has richer microbial community and more stable species diversity; after the biomembrane falls off, flocs with larger particles and good settling property are easily formed, and the biomembrane has good settling property and is easy to separate solid from liquid; in addition, the biofilm method generally does not need sludge backflow, has low energy consumption, is easy to maintain and manage and does not have the sludge bulking problem. The method is limited by the technical bottlenecks required by starting and stably operating the pure membrane pre-denitrification process, and the pure membrane denitrification is still lack of large-scale engineering application so far.
Currently, research on a one-stage autotrophic nitrogen removal related process mostly stays at a laboratory level, and the main reasons are that two functional microorganisms, namely Ammonia Oxidizing Bacteria (AOB) and anaerobic ammonia oxidizing bacteria (ANAOB), of the autotrophic nitrogen removal process grow very slowly, the multiplication time is long, the high biological concentration is difficult to maintain, and the ANAOB is easily influenced by inhibiting factors such as organic matters in inlet water and the like to reduce the activity; the AOB is aerobic bacteria, the AnAOB is anaerobic bacteria, too high dissolved oxygen can inhibit the AnAOB, too low dissolved oxygen can not ensure the conversion of ammonia nitrogen to nitrite, and the too low nitrite can cause the deficiency of the AnAOB matrix and inhibit the growth. In addition, most of the current one-stage autotrophic nitrogen removal process systems also adopt a granular sludge form, so that the resistance to dissolved oxygen is low (mostly below 1 mg/L), and the slightly high dissolved oxygen is easy to inhibit AnAOB, and even the system is broken down. In addition, the one-stage autotrophic nitrogen removal granular sludge process is difficult to realize the synergy between the nitrification performance of flocculent sludge and the activity of anaerobic ammonium oxidation bacteria of granular sludge, and meanwhile, the sludge floating upwards causes the falling of the anaerobic ammonium oxidation bacteria and the deterioration of the system performance. In view of the disadvantages of the process, whether to find a suitable autotrophic nitrogen removal process form, quickly start the process and stably run the process under high load is the key of engineering application of the process.
The research reports of the related aspects of the prior art mainly include:
wanggang et al (Wanggang. simultaneous nitrosation/anaerobic ammoxidation/denitrification (SNAD) technology-based sludge digestion liquid denitrification process research [ D)]University of continental managerial work, 2017.) the actual engineering sludge digestion liquid is treated by starting the serial nitrosation-anammox and then starting the SNAD, the nitrosation process is started by debugging the starting nitrosation process, stable effluent suitable for the anammox process is obtained, the anammox sludge and the biofilm formation MBBR filler pre-cultured by the other two pilot reactors (providing seed sludge and biofilm formation filler respectively) are inoculated into the anammox tank in batches, after the anammox tank is cultured to obtain more anammox sludge, the nitrosation tank sludge and the sludge and filler of the anammox tank are mixed, and the SNAD integrated process is started by the two tanks. The SNAD tank has the filling rate of 35 percent, 20kg of anaerobic ammonia oxidation sludge (dry weight) is inoculated to the anaerobic ammonia oxidation tank in the whole starting process, the calculated sludge concentration is 200mg/L, and the biofilm formation filler is 25m3Checking the inoculation rate of the fillerAbout 9 percent, the time from start to obtaining stable serial nitrosation-anaerobic ammoxidation exceeds 340 days, then the integral SNAD start is completed within two months, the total start time is about 400 days, the total nitrogen removal rate is about 70 percent, and the DO in the SNAD pool is 0.3-0.8mg/L after the start is successful. The starting method has the disadvantages of complicated process, continuous inoculation of seed source sludge and biofilm formation filler for engineering projects by two pilot reactors, long time consumption, low total nitrogen removal rate, high requirement on seed source biomass, difficulty in realizing large-scale amplification of a plurality of projects for a long time, low dissolved oxygen in the SNAD pool after successful starting and difficulty in enduring the impact of high DO on a system.
Starting study of CANON process under aerobic conditions [ J]Environmental science, 2009,30(6): 1689-. During the starting process, the temperature is controlled to be 35 +/-1 ℃ and the pH value is 7.39-8.01. Partial nitrosation is established at 60 days, anaerobic ammoxidation begins to develop gradually when the continuous operation is carried out to 160 days, and TN removal load reaches 1.22 kgN/(m) at 210 days3D), the TN removal rate is maintained at about 70%, the CANON process is successfully started under the aerobic condition, the starting method is long in use time, low in total nitrogen removal rate, low in applicability to engineering projects with short modification period and high requirement on total nitrogen of effluent, the sponge filler is easy to wear in the actual operation process, when a biofilm of the sponge filler forms a certain thickness, blockage is easy to occur, so that mass transfer is reduced or the filler becomes sunken to block fluidization, and certain risk exists for stable operation of engineering performance.
Startup and operation of Li Huibo et al (Li Huibo, Wang Yinshuang, Dingjuan et al, ANITA Mox autotrophic Denitrification MBBR reactor [ J]China water supply and drainage, 2014,30(5): 1-5), and starting a CANON process by using an inoculation method to treat anaerobic sludge digestion liquid. 3% total area of seeded packing Start-Up 50m3The reactor (2) is operated for 120 days (without short-cut nitrification starting), and the total nitrogen removal volume load in the stabilization period is 0.7-1.1 kgN/(m)3D) the total nitrogen surface loading is from 1.29 to 2.05 gN/(m) by calculation2D). The technology has low inoculation rate and quick start time, but NH removed by the system in a stable period4 +-N and NO formed3 -The proportion of-N is 8-15%, and has a certain difference with chemical fixed ratio (11%), and generally, the system inlet water contains certain BOD5This ratio is small due to the occurrence of denitrification, but is large due to the presence of Nitrite Oxidizing Bacteria (NOB) in the system, and it is noted that the presence of NOB competes with ANAOB for nitrite substrates, resulting in a system breakdown due to lack of suitable substrate ratio for ANAOB; in addition, the ammonia nitrogen concentration of the inlet water used by the technology is high, the total nitrogen removal load is not low due to the large water amount, but the ammonia nitrogen concentration of the outlet water still reaches about 150mg/L, the higher treatment requirement cannot be met, and other processes are required to continue treatment.
CN108083581A discloses a low-energy-consumption autotrophic nitrogen removal municipal sewage treatment system and method, wherein a serial anaerobic decarburization-autotrophic nitrogen removal mode is adopted to inoculate excess sludge of a sewage treatment plant to start an anaerobic decarburization reactor, the start-up process of the anaerobic decarburization reactor needs 60-90d, then the start-up autotrophic nitrogen removal reactor needs to inoculate 3000mg/L anaerobic ammonia oxidation sludge in a whole tank to carry out early-stage anaerobic start, manual water distribution meets the requirement of anaerobic ammonia oxidation bacteria on a substrate, the start-up process of the reactor needs 90-120d, the start-up process of the whole process needs 150 d and 210d, the preposed anaerobic decarburization tank adopts a sludge system, sludge easily enters a post-stage treatment system after long-term operation, the whole process is influenced and easily expands, in addition, the method has overlarge demand on anaerobic ammonia oxidation bacteria, high inoculation difficulty and is difficult to realize large-scale expansion of a plurality of projects for a long time, the anaerobic ammonium oxidation strain which is successfully started by early-stage artificial water distribution has certain risk on the adaptation of actual waste water.
CN108585202A discloses a process for treating domestic sewage by realizing partial shortcut nitrification, sludge fermentation coupling denitrification and anaerobic ammonia oxidation in a sequencing batch reactor, and the method relates to the starting of autotrophic nitrogen removal: inoculating sponge filler with a film hung in a laboratory shortcut nitrification anaerobic ammonia oxidation integrated reactor, mixing the sponge filler with blank filler, and then fixedly adding the mixture into the reactor, wherein the filling ratio is 40%, and water is used for water distribution. The method also has overlarge requirement on the biomass of the provenance microorganism, cannot meet the starting of large-volume engineering projects, is operated by water distribution in the starting process, cannot predict whether the cultured autotrophic nitrogen removal functional microorganism can use the actual engineering water quality, and the sponge filler is easy to wear in the actual operation process, and when the biofilm forms a certain thickness, the blockage is easy to occur to influence mass transfer or the filler becomes heavy to block fluidization.
Disclosure of Invention
In order to solve the technical defects in the prior art, the invention provides an MBBR-based efficient autotrophic nitrogen removal system and an operation method thereof, wherein the water outlet direction of four reaction tanks is controlled by communicating valves so as to realize the serial connection, parallel connection or independent operation of the reaction tanks, the autotrophic nitrogen removal process is quickly started by means of inoculation, feeding and the like, and different process arrangement forms can be realized according to the treatment standard requirements.
In order to achieve the above purpose, the technical problem to be overcome is as follows:
how to start the nitrosation and denitrification pure membrane process simultaneously by using a rapid sludge discharge method within a short period of time, reduce the inoculation proportion under the condition of limited seed sources, realize the rapid start of the autotrophic nitrogen removal system by controlling aeration, stirring, different process arrangement forms and the like through a fed-batch method, achieve higher TN to remove load and reduce the occupied area of a reaction device; how to control the opening of the communicating valve, the water inlet valve and the like and realize different process arrangement forms, thereby achieving different treatment standards and realizing the long-term stable operation of the system.
One of the tasks of the invention is to provide an efficient autotrophic nitrogen removal system based on MBBR.
In order to solve the technical problems, the invention adopts the following technical scheme:
an efficient autotrophic nitrogen removal system based on MBBR comprises a central well, a reaction tank main body, a reflux device, a communication device and an aeration device, wherein the reaction tank main body comprises two rows of four reaction tanks, namely a first reaction tank, a second reaction tank, a third reaction tank and a fourth reaction tank, the first reaction tank and the fourth reaction tank are arranged in one row and positioned at the bottom, and the first reaction tank and the second reaction tank are arranged in one row;
the central well is positioned in the center of the diagonal connection line of the four reaction tanks and comprises a denitrification tank, a water distribution well and a water outlet well, wherein the denitrification tank, the water distribution well and the water outlet well are concentric tank bodies and are sequentially a denitrification tank, a water distribution well and a water outlet well from inside to outside;
a water inlet of the denitrification tank is connected with a total water inlet pipeline, sewage to be treated enters the bottom of the denitrification tank through the total water inlet pipeline, and an interception screen is arranged at the upper part of the denitrification tank; sewage to be treated enters the distribution well through an interception screen on the upper part of the tank body of the denitrification tank, the distribution well is communicated with each reaction tank and is used for feeding water into each reaction tank, and a first sludge discharge port is formed in the bottom of the distribution well; the water outlet well is used for collecting the effluent of the four reaction tanks and discharging the effluent through a water outlet pipeline at the upper part of the water outlet well, and the bottom of the water outlet well is provided with a second sludge discharge port; an intercepting screen is arranged at the water outlet of each reaction tank;
the first reaction tank and the second reaction tank, the second reaction tank and the third reaction tank, the third reaction tank and the fourth reaction tank, and the fourth reaction tank and the first reaction tank are respectively connected through a first connecting pipeline, a second connecting pipeline, a third connecting pipeline and a fourth connecting pipeline;
the communication device comprises a communication valve, and the communication valve comprises a first communication valve positioned on the first connecting pipeline, a second communication valve positioned on the second connecting pipeline, a third communication valve positioned on the third connecting pipeline and a fourth communication valve positioned on the fourth connecting pipeline; a first water inlet and a fourth water inlet are respectively arranged above the first reaction tank and the fourth reaction tank close to the central well, a second water inlet and a third water inlet are respectively arranged below the second reaction tank and the third reaction tank close to the central well, and water is respectively fed into the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank through the first water inlet, the second water inlet, the third water inlet and the fourth water inlet;
stirring devices are arranged in the denitrification tank and each reaction tank;
the reflux device comprises a reflux pump which is arranged on a reflux pipe connected with the bottom of the water outlet well, and the other end of the reflux pipe is communicated with the denitrification tank;
the aeration devices are distributed in each reaction tank, and suspension carriers are added into the denitrification tank and each reaction tank.
The beneficial technical effect that above-mentioned technical scheme brought is, realize the control to every reaction tank play water direction through above-mentioned intercommunication device. Three different control modes different from the prior art can be realized, namely: the reaction tanks are connected in series, parallel or independently operated by controlling the water outlet directions of the first reaction tank to the fourth reaction tank, and by adopting the three control modes, the inoculation ratio is small, the starting is fast, the denitrification efficiency is high, the tolerance to water inlet organic matters is good, and the specific beneficial technical effects are shown in the specific implementation mode of the specification.
As a preferred aspect of the present invention, the first water inlet, the second water inlet, the third water inlet and the fourth water inlet are respectively connected to the water distribution well through a first water inlet pipeline, a second water inlet pipeline, a third water inlet pipeline and a fourth water inlet pipeline, the first water inlet pipeline is provided with a first water inlet valve, the second water inlet pipeline is provided with a second water inlet valve, the third water inlet pipeline is provided with a third water inlet valve, and the fourth water inlet pipeline is provided with a fourth water inlet valve; the interception screen cloth positioned at the water outlet of the reaction tank comprises a first interception screen cloth positioned in the first reaction tank, a second interception screen cloth positioned in the second reaction tank, a third interception screen cloth positioned in the third reaction tank and a fourth interception screen cloth positioned in the fourth reaction tank. .
As another preferable scheme of the invention, the aeration device in each reaction tank consists of a plurality of groups of perforated aeration pipes and microporous aeration pipes.
Furthermore, the water outlet ends of the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank are respectively connected with the water outlet well through a first water outlet pipeline, a second water outlet pipeline, a third water outlet pipeline and a fourth water outlet pipeline, and a first water outlet valve, a second water outlet valve, a third water outlet valve and a fourth water outlet valve are correspondingly arranged on the first water outlet pipeline, the second water outlet pipeline, the third water outlet pipeline and the fourth water outlet pipeline.
Another task of the present invention is to provide an operation method of the MBBR-based high efficiency autotrophic nitrogen removal system, which includes the following three control modes:
first, parallel operating mode:
the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank are in parallel relation, each reaction tank independently feeds water and independently discharges water, and the discharged water is collected to a water outlet well and discharged through a water outlet pipeline by controlling a relevant valve;
second, dual series a mode of operation:
the sewage to be treated passes through the denitrification tank, enters the distribution well through an interception screen on the upper part of a tank body of the denitrification tank, continuously enters the first reaction tank and the fourth reaction tank through the first water inlet and the fourth water inlet respectively, water in the first reaction tank enters the second reaction tank by controlling related valves, so that water in the fourth reaction tank enters the third reaction tank, is finally collected to the water outlet well and is discharged through the water outlet pipeline;
third, dual series B mode of operation:
the first reaction tank, the second reaction tank and the third reaction tank are in a group, the fourth reaction tank is in a group, sewage to be treated passes through the denitrification tank, enters the distribution well through the interception screen on the upper part of the tank body of the denitrification tank, continuously enters the first reaction tank and the fourth reaction tank through the first water inlet and the fourth water inlet respectively, water in the first reaction tank sequentially enters the second reaction tank and the third reaction tank by controlling the relevant valves, and finally, the discharged water is collected to the water outlet well and is discharged through the water outlet pipeline.
Preferably, the parallel operation mode comprises the following specific steps: the sewage to be treated enters the denitrification tank through a water inlet of the denitrification tank, enters the distribution well through the interception screen on the upper part of the tank body of the denitrification tank, then continuously enters each reaction tank through the first water inlet valve, the second water inlet valve, the third water inlet valve, the fourth water inlet valve, the first water inlet, the second water inlet, the third water inlet and the fourth water inlet, the effluent water respectively passes through the first interception screen, the second interception screen, the third interception screen and the fourth interception screen, then is discharged into a water outlet well through respective water outlet valves, and finally is discharged through a water outlet pipeline.
Preferably, the double-series a operation mode comprises the following specific steps: the sewage to be treated enters a denitrification tank through a water inlet of the denitrification tank, enters a distribution well through an interception screen on the upper part of a tank body of the denitrification tank, then continuously enters a first reaction tank and a fourth reaction tank through a first water inlet valve, a fourth water inlet valve, a first water inlet and a fourth water inlet respectively, the effluent of the first reaction tank enters a second reaction tank through the first interception screen, a first communication valve and a second interception screen, and is converged into a water outlet well through the second interception screen and a second water outlet valve to be discharged through a water outlet pipeline; and the water outlet of the fourth reaction tank enters a third reaction tank through a fourth interception screen, a third communication valve and a third interception screen, and the water outlet of the third reaction tank converges into a water outlet well after passing through a third interception screen and a third water outlet valve, and then is discharged through a water outlet pipeline.
Preferably, the above-mentioned double series B operation mode comprises the following specific steps: the double series B operation mode comprises the following specific steps: the sewage to be treated enters a denitrification tank through a water inlet of the denitrification tank, enters a distribution well through an interception screen on the upper part of a tank body of the denitrification tank, then continuously enters a first reaction tank and a fourth reaction tank through a first water inlet valve, a fourth water inlet valve, a first water inlet and a fourth water inlet respectively, the effluent of the first reaction tank enters a second reaction tank through a first interception screen, a first communicating valve and a second interception screen, the effluent of the second reaction tank enters a third reaction tank through a second interception screen, a second communicating valve and a third interception screen, and the effluent of the third reaction tank is collected to a water outlet well through a third interception screen and a third water outlet valve and then is discharged through a water outlet pipeline; and the water discharged from the fourth reaction tank is converged into a water outlet well through a fourth interception screen and a fourth water outlet valve, and is discharged through a water outlet pipeline.
Compared with the prior art, the invention has the following beneficial technical effects:
1) the starting time is short, and the starting can be successful only in 110 days;
2) the autotrophic denitrification inoculation ratio is small, and the inoculation ratio is not more than 5 percent;
3) the starting scale is large, and the method is suitable for large-scale starting of large-volume engineering;
4) the operation is stable, and the engineering requirements are met;
5) the operation mode is flexible, and the water outlet directions of the four reaction tanks are controlled by the communicating valves according to the water outlet standard to realize the serial connection, parallel or independent operation among the reaction tanks to realize the stable operation;
6) high load, less land occupation, and the highest volume load of 1.3 kgN/(m)3·d)；
7) The denitrification tank adopts an MBBR form, and sludge is discharged from the bottom of the regular water distribution well, so that a fallen denitrification biomembrane can be prevented from entering the autotrophic nitrogen removal reaction tank, and adverse effects are brought to autotrophic nitrogen removal functional microorganisms.
8) The operation control is simple, the autotrophic nitrogen removal reaction tank adopts an MBBR form, effective strains are highly enriched on the carrier, and the treatment load is high.
9) The addition of the preposed denitrification can reduce the adverse effect of the COD of the inlet water on the autotrophic nitrogen removal functional microorganisms, create a good environment for the autotrophic nitrogen removal reaction tank, improve the total nitrogen removal rate to a certain extent, and the denitrification tank can supplement a certain alkalinity to the autotrophic nitrogen removal reaction tank to enhance the nitrification effect.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a plan view of the MBBR-based high efficiency autotrophic nitrogen removal system according to the present invention;
FIG. 2 is a left side view of the MBBR-based high efficiency autotrophic nitrogen removal system according to the present invention;
in the figure, 1, a main water inlet pipeline; 2. a denitrification tank; 3. distributing a water well; 4. a water outlet well; 5. a water outlet pipe; 6. a reaction tank stirring device; 7. a denitrification tank stirring device; 8. intercepting a screen mesh in a denitrification tank; C1-C4, a reaction tank (a first reaction tank-a fourth reaction tank); S1-S4, a reaction tank interception screen (a first interception screen-a fourth interception screen); I1-I4, a water inlet valve (first water inlet valve-fourth water inlet valve); E1-E4, outlet valve (first outlet valve-fourth outlet valve); H. a reflux pump; M1-M4, a communication valve (first communication valve-fourth communication valve).
Detailed Description
The invention provides an efficient autotrophic nitrogen removal system based on MBBR and an operation method thereof, and the invention is described in detail below by combining specific embodiments in order to make the advantages and technical scheme of the invention clearer and clearer.
First, the related art terms involved in the present invention are explained as follows:
1) the suspension carrier, the specific gravity is 0.93-0.97, the void ratio is more than 90%, and the suspension carrier is also called suspension filler, carrier and filler for short;
2) effective specific surface area: since the outer surfaces of the carriers rub against each other and it is difficult for microorganisms to attach to them, the effective specific surface area generally refers to the inner surface area, i.e., the effective surface area per unit volume of the carriers. Effective specific surface area ═ effective surface area ÷ volume, in m2/m3；
3) Specific gravity: the ratio of the density of the carrier to the density of water at normal temperature;
4) porosity: the ratio of the volume of the gaps between the carriers and the gaps among the carriers to the stacking volume of the carriers;
5) fluidization: under the action of aeration or stirring, the filler flows along with the water flow in the liquid and is in full contact with water pollutants, and the suspended carriers do not accumulate and can freely flow along with the water flow in the tank;
6) filling rate: the filling rate of the suspension carrier, namely the ratio of the volume of the suspension carrier to the pool capacity of the filling area, wherein the volume of the suspension carrier is the total volume under natural accumulation; e.g. 100m3Suspending vehicle, filled to 400m3The tank capacity is 25 percent;
7) surface loading: the amount of pollutants removed per day per unit specific surface area of the filler, gN/(m)2·d)；
8) Ammonia oxidation surface loading: the mass of the unit specific surface area of the filler, gN/(m)2D); if the ammonia nitrogen of the inlet water is 400mg/L, the ammonia nitrogen of the outlet water is 200mg/L,inflow rate of 5m3D, biofilm area 1000m2The ammonia oxidation surface load is 1 gN/(m) at (400-2·d)；
9) TN removal of surface load: the mass of total nitrogen per unit of effective specific surface area of the filler removed per day, gN/(m)2D); if the inlet water TN is 500mg/L, the outlet water TN is 100mg/L, and the inlet water flow is 10m3D, biofilm area 2000m2If the TN removal surface load is (500-100). times. 10/2000 ═ 2 gN/(m)2·d)；
10) Autotrophic nitrogen removal: the process is a general name of nitrosation and anaerobic ammonia oxidation (ANAMMOX), so that the aim of denitrification is fulfilled; under aerobic conditions, Ammonia Oxidizing Bacteria (AOB) oxidize ammonia nitrogen part into nitrous acid, and the generated nitrous acid and part of the rest ammonia nitrogen are subjected to anaerobic ammonia oxidation (ANAMMOX) reaction under the action of anaerobic ammonia oxidizing bacteria (ANAOB) to generate nitrogen;
11) CANON process, i.e. autotrophic nitrogen removal in a single reactor; in CANON, AOB and AnAOB coexist in the same reactor; the AOB is positioned on the outer layer of the carrier, and oxygen is used as an electron acceptor to oxidize ammonia nitrogen into nitrite; the AnAOB is positioned in the inner layer of the carrier, and the nitrite is used as an electron acceptor to be converted into nitrogen together with the residual ammonia nitrogen;
12) CANON suspension vector: namely, the suspension carrier with CANON effect exists, AOB and AnAOB exist in a biomembrane mode in a layered mode;
13) nitrosation: microorganism will ammonia Nitrogen (NH)4 +) Oxidation to nitrite Nitrogen (NO)2 -) Without further oxidation to nitrate Nitrogen (NO)3 -) The process of (1), namely enriching Ammonia Oxidizing Bacteria (AOB) in the system and eliminating Nitrite Oxidizing Bacteria (NOB);
14) MBBR: moving Bed Biofilm reactor MBBR (moving Bed Biofilm reactor) the method increases the biomass and the biological species in the reactor by adding a certain amount of suspension carriers into the reactor, thereby increasing the treatment efficiency of the reactor;
15) aeration strength: aeration per unit area in m3/(m2H) including the sum of the two parts of micro-aeration and perforating aeration; such as aeration rate of micropores10m3H, perforation aeration rate of 5m3H, the bottom area of the reactor is 5m2The aeration intensity is (10+ 5)/5-3 m3/(m2·h)；
16) Reflux ratio: the ratio of the water amount which flows back to the biological section for continuous treatment to the total water amount is percent;
17) total ammonia oxidation rate: the ratio of the total amount of ammonia nitrogen oxidized after the intake water passes through the multi-stage aerobic reaction tank to the total amount of ammonia nitrogen in the intake water is percent; if the ammonia nitrogen in the inlet water is 400mg/L, the ammonia nitrogen in the outlet water is 100mg/L after passing through the two-stage aerobic reaction tank, and the total ammonia oxidation rate is (400-100)/400-75%; for single stage reactors, it is generally referred to directly as the ammoxidation rate; for a multistage reactor, the ammonia oxidation rate refers to the ammonia nitrogen oxidation condition of each stage, and if the performance of the multistage whole is analyzed, the total ammonia oxidation rate is used;
18) TN removal rate: the total nitrogen removal amount accounts for the ratio of the total nitrogen of the inlet water;
19) common activated sludge: namely activated sludge in a biochemical pool of a sewage plant, and the inoculation of the sludge mainly comprises the primary acquisition of AOB strains and the accelerated biofilm formation;
20) C/N: i.e. the ratio of carbon to nitrogen in the feed water, refers to BOD in the feed water5The ratio to Kjeldahl nitrogen (organic nitrogen + ammonia nitrogen);
21) pretreatment: if the C/N of the inlet water is too large and is not suitable for the treatment of the autotrophic nitrogen removal related process, the pretreatment is carried out to reduce the content of organic matters until the water quality requirement of autotrophic nitrogen removal is met;
22) stirrer power: i.e. the power per unit effective tank volume, W/m3(ii) a The activated sludge process is usually 3-5W/m3(ii) a In MBBR, the agitation power is correlated with the filling rate, and the higher the filling rate, the higher the agitation power.
The reaction device comprises a first reaction tank, a second reaction tank, a third reaction tank and a fourth reaction tank which are described below, wherein the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank are abbreviated as C1, C2, C3 and C4, a first water inlet valve, a second water inlet valve, a third water inlet valve and a fourth water inlet valve are abbreviated as I1, I2, I3 and I4, a first communication valve, a second communication valve, a third communication valve and a fourth communication valve are abbreviated as M1, M2, M3 and M4, a first water outlet valve, a second water outlet valve, a third water outlet valve and a fourth water outlet valve are abbreviated as E1, E2, E3 and E4, and a first interception screen, a second interception screen, a third interception screen and a fourth interception screen are abbreviated as S1, S2, S3 and S4.
The invention discloses an efficient autotrophic nitrogen removal system based on MBBR (moving bed biofilm reactor), which is shown by combining a picture 1 and a picture 2 and comprises a denitrification pool 2, a water distribution well 3, a reaction pool main body C1-C4, a water outlet well 4, a denitrification pool stirring device 7, a reaction pool stirring device 6, a communication device and a reflux pump H, wherein the reaction pool main body comprises two rows and two columns of four reaction pools, namely a first reaction pool, a second reaction pool, a third reaction pool and a fourth reaction pool, the first reaction pool and the fourth reaction pool are arranged in a row and positioned at the bottom, the first reaction pool and the second reaction pool are arranged in a column, namely the first reaction pool is positioned at the lower left, the second reaction pool, the third reaction pool and the fourth reaction pool are respectively positioned in the clockwise direction, the process center is a concentric center well, and the denitrification pool, the water distribution well and the water outlet well are sequentially arranged from inside to outside.
A first water inlet and a fourth water inlet are respectively arranged above the sides (close to the water outlet well ends) of the first reaction tank and the fourth reaction tank, water enters the first reaction tank and the fourth reaction tank through I1 and I4, a second water inlet and a third water inlet are respectively arranged below the sides of the second reaction tank and the third reaction tank, water enters the second reaction tank and the third reaction tank through I2 and I3, a first interception screen mesh S1, a second interception screen mesh S2, a third interception screen mesh S3 and a fourth interception screen mesh S4 are respectively arranged at the first water outlet, the second water outlet, the third water outlet and the fourth water outlet, and the first interception screen mesh, the second interception screen mesh, the third interception screen mesh and the fourth interception screen mesh are obliquely arranged; the first water inlet, the second water inlet, the third water inlet and the fourth water inlet are respectively connected with the water distribution well through a first water inlet pipeline, a second water inlet pipeline, a third water inlet pipeline and a fourth water inlet pipeline, a first water inlet valve I1 is arranged on the first water inlet pipeline, a second water inlet valve I2 is arranged on the second water inlet pipeline, a third water inlet valve I3 is arranged on the third water inlet pipeline, and a fourth water inlet valve I4 is arranged on the fourth water inlet pipeline; the denitrification tank is provided with a total water inlet pipeline 1, a denitrification tank interception screen 8 and a denitrification tank stirring device 7, and water is fed from the total water inlet pipeline 1; the sewage to be treated enters the bottom of the denitrification tank through the main water inlet pipeline, and enters the distribution well through the interception screen at the upper part of the denitrification tank. The water outlet ends of the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank are respectively connected with the water outlet well through a first water outlet pipeline, a second water outlet pipeline, a third water outlet pipeline and a fourth water outlet pipeline, and a first water outlet valve E1, a second water outlet valve E2, a third water outlet valve E3 and a fourth water outlet valve E4 are correspondingly arranged on the first water outlet pipeline, the second water outlet pipeline, the third water outlet pipeline and the fourth water outlet pipeline.
The distribution well is provided with pipelines connected with the four reaction tanks, and the pipelines are provided with water inlet valves I1, I2, I3 and I4; the water outlet well is provided with pipelines which are connected with the four reaction tanks, the effluent of the four reaction tanks is collected through a water inlet pipeline and water outlet valves E1, E2, E3 and E4 and is discharged through a water outlet pipe 5 at the upper part of the tank body, the bottom of the distribution well is provided with a first sludge discharge port for discharging sludge, and the bottom of the water outlet well is provided with a second sludge discharge port for discharging sludge;
all set up a agitating unit in every reaction tank, agitating unit's concrete structure and operation mode borrow the prior art for reference and can realize, if the optional frequency conversion agitator of agitating unit.
The reflux pump is arranged at the bottom of the water outlet well, and a reflux pipe is introduced into the denitrification tank;
the communicating valves, namely the reactors are connected through the communicating valves and comprise a first communicating valve, a second communicating valve, a third communicating valve and a fourth communicating valve; the first communicating valve is positioned on a connecting pipeline between the first reaction tank and the second reaction tank, the second communicating valve is positioned on a connecting pipeline between the second reaction tank and the third reaction tank, the third communicating valve is positioned on a connecting pipeline between the third reaction tank and the fourth reaction tank, and the fourth communicating valve is positioned on a connecting pipeline between the first fourth reaction tank and the first reaction tank;
the aeration devices are distributed in the denitrification tank and each reaction tank and consist of a plurality of groups of perforated aeration pipes and microporous aeration pipes, and suspension carriers are added in the denitrification tank and each reaction tank.
Secondly, the operation flow of the present invention is mainly described below with reference to the above system.
The operation flow comprises the following 3 control modes:
1) parallel operation mode: sewage to be treated passes through a denitrification tank 2, enters a distribution well from an interception screen 8 at the upper part of a tank body of the denitrification tank, passes through a water inlet valve I1-I4 and first to fourth interception screens S1-S4 by the distribution well, continuously enters each reaction tank C1-C4, and is discharged through interception screens S1-S4, then a water outlet valve E1-E4 to a water collecting well 4 and finally a water outlet pipe 5; the four pools are in parallel connection and operate independently, the effluent is finally gathered to a central water collecting well 4 and flows out through a water outlet pipe 5, and the process is controlled by a valve; the valves are not described as being in a closed state;
2) dual series a mode of operation: sewage to be treated passes through the denitrification tank 2, enters a distribution well from an interception screen 8 at the upper part of a tank body of the denitrification tank, and continuously enters reaction tanks C1 and C4 from the distribution well through water inlet valves I1 and I4 respectively; c1 effluent enters a reaction tank C2 through a first interception screen S1, a communication valve M1 and a second interception screen S2, and C2 effluent passes through a second interception screen S2, a water outlet valve E2 and a water collecting well 4 and then is discharged through a water outlet pipe 5; c4 effluent enters a reaction tank C3 through a fourth interception screen S4, a communication valve M3 and a third interception screen S3, and C3 effluent passes through a third interception screen S3, a water outlet valve E3 and a water collecting well 4 and then is discharged through a water outlet pipe 5; the double series A mode is that two groups are connected in parallel, two grids of each group are respectively connected in series, namely C1-C2 and C4-C3, and the effluent is finally gathered to a central water collecting well 4 and is discharged through a water outlet pipe 5;
3) dual series B mode of operation: sewage to be treated passes through a denitrification tank 2, enters a distribution well from an interception screen 8 at the upper part of a tank body of the denitrification tank, and continuously enters reaction tanks C1 and C4 from the distribution well through water inlet valves I1 and I4 and interception screens S1 and S4 respectively; c1 effluent enters a reaction tank C2 through a first interception screen S1, a communication valve M1 and a second interception screen S2, C2 effluent enters C3 through a second interception screen S2, a communication valve M2 and a third interception screen S3, and C3 effluent passes through a third interception screen S3, an effluent valve E3 and a water collecting well 4 and then is discharged through a water outlet pipe 5; c4 water passes through a fourth interception screen S4, a water outlet valve E4 and a water collecting well 4 and then is discharged through a water outlet pipe 5; two series B modes, two sets in parallel: the three grids are connected in series, and the single grids, namely C1-C2-C3 and C4, are connected in series, and the effluent is finally gathered to the central water collecting well 4 and flows out through the water outlet pipe 5.
Different operation modes are set, and the functional requirements of different reactors and different operation stages are mainly considered to be met.
Thirdly, the starting method of the invention comprises the following steps:
1) starting preparation, namely adding a suspension carrier into each reaction tank and each denitrification tank, wherein the filling rate is 20-67%; common activated sludge is inoculated in both the reaction tank and the denitrification tank, and the sludge concentration after inoculation is 3-5 g/L;
2) nitrosation and denitrification are started, a parallel operation mode is adopted, each reaction tank independently feeds water and independently discharges water, the discharged water is collected into a water outlet well by controlling a relevant valve, part of discharged water of the water outlet well flows back to the denitrification tank, and the rest of discharged water is discharged through a water outlet pipeline; a second sludge discharge port at the bottom of the water outlet well is opened for discharging sludge in a short time every day, so that the sludge is gradually lost, the sludge concentration is reduced by no more than 20% every day until the sludge concentration in the reaction tank and the denitrification tank<1.0g/L, controlling DO in the reaction tank to be 3-6mg/L, and controlling the aeration intensity>5m3/(m2H) run until denitrification pool BOD5Removal rate>50% of ammonia oxidation surface load of each reaction tank>1.5gN/(m2D), go to the next step;
3) autotrophic denitrification pre-starting, adopting a double-series A operation mode, continuously feeding water, collecting discharged water by controlling related valves, returning part of discharged water from a water outlet well to a denitrification tank, discharging the rest of discharged water through a water outlet pipeline, controlling DO in a reaction tank C4 and a reaction tank C3 to be 3-6mg/L, and controlling aeration intensity>5m3/(m2H), total ammoxidation rates of C4 and C3 > 50%; stirring speed of 30-45r/min and DO of 1-2mg/L in reaction tank C1 and reaction tank C2, and aeration intensity>3m3/(m2H), total ammoxidation rates of C1 and C2 > 50%; the operation is carried out until the ammonia oxidation surface load of the reaction tank C1>1.0gN/(m2D) go to the next step;
4) starting autotrophic denitrification inoculation, adopting a double-series A operation mode, controlling related valves to enable effluent to be collected into an effluent well, enabling part of effluent from the effluent well to flow back to a denitrification tank, discharging the rest effluent through an effluent pipeline, controlling DO to be 3-6mg/L in a reaction tank C4 and a reaction tank C3, and controlling aeration intensity>5m3/(m2·h) The total ammoxidation rate of C4 and C3 is more than 50 percent; the stirring speed of the reaction tank C2 is controlled to be 15-30r/min, the DO is 1-2mg/L, and the aeration intensity is controlled>3m3/(m2H); total ammoxidation rates of C1 and C2>50 percent; inoculating CANON suspension carrier into the reaction tank C1, wherein the inoculation rate is 3-5%, and continuously feeding water; the stirring speed of the reaction tank C1 is controlled to be 15-30r/min, the DO is 0.5-1.5mg/L, and the aeration intensity is controlled>2m3/(m2H); the operation is carried out until the TN of the reaction tank C1 removes the surface load>0.8gN/(m2D) go to the next step;
5) the autotrophic nitrogen removal fed-batch is started, and a double-series B operation mode is adopted to continuously feed water; the effluent is collected into an effluent well by controlling a relevant valve, part of the effluent from the effluent well flows back to the denitrification tank, and the rest effluent is discharged through an effluent pipe; c4 controlling DO at 3-6mg/L, aeration intensity>5m3/(m2H) ammoxidation rate>50 percent; c1 controlling stirring speed at 15-30r/min, DO at 1.5-3.5mg/L, and aeration intensity>5m3/(m2H), C2 controlling the stirring speed at 30-45r/min, DO at 0.5-1.5mg/L and the aeration intensity>1.5m3/(m2H); c3 controlling stirring speed at 30-45r/min, DO at 1-2mg/L, and aeration intensity>3m3/(m2H); the operation is carried out until the TN of the reaction tank C2 removes the surface load>1.6gN/(m2D) go to the next step;
6) the autotrophic nitrogen removal is expanded and started, a double-series A operation mode is adopted, the related valves are controlled to enable the effluent to be collected into the effluent well, part of the effluent well flows back to the denitrification tank, and the rest effluent is discharged through the water outlet pipe; 50% of the suspended fillers in the C4 reaction tank and the C3 reaction tank and the C1 reaction tank and the C2 reaction tank are respectively replaced, the rotating speed of a stirring device is controlled to be 15-30r/min, the DO is controlled to be 2.3-2.5mg/L, and the aeration intensity is 3.5m3/(m2H) running until TN of the individual reaction cells has been freed of surface loading>1.6gN/(m2D), go to the next step;
7) the autotrophic nitrogen removal stably operates, and water continuously enters; when the TN removal rate is required<When 80 percent of the water is discharged, a parallel operation mode is adopted, the discharged water is collected into a water outlet well by controlling related valves, part of discharged water of the water outlet well flows back to the denitrification tank, and the rest of discharged water is discharged through a water outlet pipe; the stirring speed of each reaction tank is controlled to be 30-45r/min, DO is 2.0-5.0mg/L, aeration intensity>5m3/(m2H), the ammonia nitrogen of the effluent of each reaction tank is 60-100mg/L, and the TN of each reaction tank removes the surface load>2.5gN/(m2D); when the TN removal rate is required to be more than or equal to 80%, adopting a double-series A operation mode, controlling related valves to enable effluent to be collected into an effluent well, enabling part of effluent of the effluent well to flow back to the denitrification tank, and discharging the rest effluent through an effluent pipe; the ammonia nitrogen of the effluent of the reaction tank C2 or the reaction tank C3 is 30-50mg/L, the stirring speed of the reaction tank C1 and the reaction tank C4 are controlled to be 30-45r/min, the DO is 2.0-5.0mg/L, and the aeration intensity is controlled to be higher than that of the mixture>6m3/(m2H) removal rate of TN>50 percent; the stirring speed of the reaction tank C2 and the reaction tank C3 are controlled to be 15-30r/min, the DO is 1.5-2.5mg/L, and the aeration intensity is controlled>3m3/(m2H); the first sludge discharge port at the bottom of the distribution well is opened periodically to discharge sludge, and the sludge concentration of each reaction tank and each denitrification tank<1g/L。
In the steps, when the C/N of the inlet water is less than 1, the reflux ratio of the outlet well is controlled to be 150-200%, when the C/N of the inlet water is more than or equal to 1 and less than 1.5, the reflux ratio of the outlet well is controlled to be 200-250%, when the C/N of the inlet water is more than or equal to 1.5 and less than 2, the reflux ratio of the outlet well is controlled to be 250-300% of the denitrification pool, the stirring speed is controlled to be 30-50r/min, and the stirrer power of each reaction pool and each denitrification pool is 15-50w/m3And (4) selecting the type.
Fourth, supplementary explanation:
1) the method adopts the MBBR form to realize one-stage autotrophic nitrogen removal, mainly adopts a two-stage process, has complex control, needs to control the nitrosation effluent ratio and meets the process requirements of ANAMMOX; by adopting a granular sludge mode, the AnAOB is not easy to enrich, and the activated sludge method is easy to lose and difficult to start or granulate; for microorganisms, the attachment state and the suspension state show completely different property characteristics, the related method of the activated sludge process cannot be directly used for the biofilm process, and the characteristics of autotrophic nitrogen removal and MBBR (moving bed biofilm reactor) processes need to be pertinently controlled;
2) DO control requirements at all stages are different, the DO is controlled to provide an aerobic or anaerobic environment for the autotrophic denitrification biomembrane, the survival environment of AOB and AnAOB is ensured, and the DO level is adjusted along with the thickness change and the maturation process of the biomembrane to meet the requirement of biomembrane layering; the more mature the biofilm, the relative increase in biofilm thickness, the stronger the tolerance to DO, the higher DO levels are required; meanwhile, the thickness of the biological membrane is relatively increased, and higher shearing force is also needed to control the thickness of the biological membrane and prevent the biological membrane from being too thick; therefore, two indexes of DO and aeration intensity are required to be controlled simultaneously; the MBBR autotrophic nitrogen removal process belongs to a complete biological membrane system, and has great difference with the traditional activated sludge method in control method and characteristics; for the activated sludge method, the DO of the autotrophic nitrogen removal process is not more than 1mg/L generally;
3) the operation modes of all stages are different, the inoculation mode and the operation mode are mainly considered, the biological membrane falls off, and although the biological membrane naturally falls off in the aging process, more active strains still exist, can be inoculated for a subsequent reactor, and accelerate the starting process, so that the biological membrane is gradually inoculated by adopting a plurality of operation modes;
4) the stirring speed of the autotrophic denitrification reaction tank is controlled in order to assist fluidization of the suspended carrier when aeration is insufficient and prevent the thickening of the biomembrane under the condition of over-low shearing force or the falling off of the biomembrane under the condition of over-high shearing force;
5) the invention is suitable for high-temperature wastewater with high ammonia nitrogen and C/N less than 2, and is particularly suitable for treating anaerobic sludge digestion supernatant, landfill leachate and the like;
6) different reflux ratios are required to be set for different inlet water C/N, and the main reason is that along with the increase of the inlet water C/N, the denitrification process can be enhanced by adjusting the reflux ratio upwards, the influence of COD (chemical oxygen demand) in the inlet water on an autotrophic nitrogen removal system is eliminated, and the nitrogen removal efficiency is improved.
As is well known to those skilled in the art, when the C/N of the inlet water is more than or equal to 2, the pretreatment is added to meet the requirement.
As is well known to those skilled in the art, a heat exchange system is added when the temperature of the inlet water is not between 25 and 35 ℃.
As is well known to those skilled in the art, the specific gravity of the suspension carrier before membrane formation is slightly smaller than that of water, usually 0.93-0.97, and the specific gravity after membrane formation is close to that of water, so as to achieve the suspension effect, and the suspension carrier is generally made of high-density polyethylene.
As is well known to those skilled in the art, short-flow prevention devices, such as partition plates, flow guide walls, etc., are installed between the connecting pipes collected in the individual reaction tanks to prevent uneven mixing of the influent water.
The present invention is further illustrated by the following specific examples.
Example 1:
anaerobic digestion sludge dewatering liquid of a certain municipal sewage treatment plant is used as system inlet water, and the water quantity is 2500m3(d), pH mean value 7.9, water temperature mean value 32 ℃, influent COD concentration mean value 1131mg/L, BOD5952mg/L of concentration mean value, 550mg/L of ammonia nitrogen concentration mean value, 2.0mg/L of nitrite nitrogen concentration mean value and alkalinity mean value (as CaCO)3Meter) 3795mg/L and total effective volume of reaction tank is 800m3And the effective volume of the denitrification tank is 400m3And the inlet water enters four reaction tanks C1-C4 through a denitrification tank.
Starting preparation, adding a suspension carrier into each reaction tank and each denitrification tank, wherein the effective specific surface area of the carrier is 800m2/m3The porosity is 90 percent, the industrial standard of high density polyethylene suspension carrier for water treatment (CJ/T461-2014) is met, and the filling rate is 50 percent; inoculating common activated sludge in the reaction tanks, wherein the sludge concentration in each reaction tank is 3.9 g/L;
nitrosation and denitrification are started, a parallel operation mode is adopted, DO of each reaction tank is controlled to be 4.0-4.6mg/L through an aeration device, and the aeration intensity is 5.2m3/(m2H), collecting the effluent water to the effluent well by opening the effluent valve E1-E4, returning part of the effluent water of the effluent well to the denitrification tank for inoculation in the denitrification tank, discharging the rest effluent water through the effluent pipeline, opening a sludge discharge port at the bottom of the effluent well for sludge discharge after running for 6d every day in a short time, gradually losing the sludge, reducing the sludge concentration by no more than 20% every day, and running to a 14 th reaction tank and the denitrification tank until the sludge concentration is reduced to about 0.8 g/L. The ammonia nitrogen concentration mean value of outlet water is 239.3mg/L, the ammonia oxidation rate of the reaction tank is 56%, and the ammonia oxidation surface load is 2.03 gN/(m) when the reaction tank is operated to the 27d reaction tank C1-C42D) denitrification pool BOD5The removal rate is 90%, and the next step is carried out.
Autotrophic denitrification pre-starting, adopting a double-series A operation mode, controlling DO of the reaction tanks C4 and C3 at 4.0mg/L and controlling aeration intensity at 5m3/(m2H), the total ammoxidation rate of C4 and C3 reaches 62 percent;stirring in reaction tanks C1 and C2 at 30r/min, controlling DO at 1.5mg/L and aeration intensity at 3m3/(m2H), collecting the effluent water through opening valves E2 and E3, returning part of the effluent water from the effluent water well to a denitrification tank, discharging the rest effluent water through an effluent water pipeline, and after the operation for 15d, ensuring that the total ammonia oxidation rate of C1 and C2 reaches 51 percent and the ammonia oxidation surface load of C1 is 1.92gN/(m N)2D) denitrification pool BOD5The removal rate is 85 percent, and the next step is carried out;
starting autotrophic denitrification inoculation, adopting a double-series A operation mode, inoculating CANON suspension carriers into a reaction tank C1, wherein the inoculation rate is 4%, the stirring speed is controlled to be 30r/min, the DO is 0.8mg/L, and the aeration intensity is 2.1m3/(m2H); the effluent of the reaction tank C1 enters a reaction tank C2 through a communication valve M1, the stirring speed is controlled by C2 to be 20r/min, the DO is 2mg/L, and the aeration intensity is 3M3/(m2H), control of DO at 4mg/L by C4 and C3, aeration intensity of 5m3/(m2H), collecting effluent water through opening valves E2 and E3, returning part of the effluent water well to a denitrification tank, discharging the rest effluent water through an effluent water pipeline, running from 31d to C4, wherein the total ammonia oxidation rate of C3 reaches 72%, and removing the surface load of TN of a reaction tank C1 reaches 1.74 gN/(m) after the operation is carried out for 31d, the total ammonia oxidation rate of C4 and the total ammonia oxidation rate of C3 are reached, and the surface load of TN2D) denitrification pool BOD5The removal rate is 85 percent, and the next step is carried out;
the autotrophic nitrogen removal fed-batch is started, a double-series B operation mode is adopted, DO in a reaction tank C4 is controlled to be 3.5-4mg/L, and the aeration intensity is 5.5m3/(m2H), the ammoxidation rate reaches 52 percent, the stirring speed of the reaction tank C1 is controlled to be 30r/min, the DO is controlled to be 2-2.5mg/L, and the aeration intensity is 5m3/(m2H); the stirring speed of the reaction tank C2 is controlled to be 35r/min, the DO is between 1.0 and 1.3mg/L, and the aeration intensity is 2.5m3/(m2H), the stirring speed of the reaction tank C3 is controlled to be 45r/min, the DO is controlled to be 1.3-1.5mg/L, and the aeration intensity is 3m3/(m2H); collecting effluent water through opening valves E3 and E4, returning part of the effluent water from the effluent water well to a denitrification tank, discharging the rest effluent water through an effluent water pipeline, and removing the surface load of 1.79gN/(m n) through TN running from 27d to a reaction tank C22D) denitrification pool BOD5The removal rate is 80 percent, and the next step is carried out;
the autotrophic nitrogen removal is expanded to start, and adopts a double seriesA, a running mode, wherein water is continuously fed; displacing 50% of the suspension vehicle in the C4 and C3 reaction cells with the C1 and C2 reaction cells, respectively; the stirring speed of each reaction tank is controlled to be 30r/min, the DO is controlled to be 1.5-2mg/L, and the aeration intensity is controlled to be 3m3/(m2H); collecting the effluent water into an effluent well by opening valves E2 and E3, returning part of the effluent water from the effluent well to a denitrification pool, discharging the rest effluent water through an effluent pipe, and operating for 27d until TN of each reaction pool removes the surface load of 2.2 gN/(m) n2D) denitrification pool BOD5The removal rate is 60 percent, and the next step is carried out;
the autotrophic nitrogen removal system runs stably, a double-series A running mode is adopted, DO of the reaction tank C1 and DO of the reaction tank C4 are controlled to be 3mg/L, and the aeration intensity is 5.6m3/(m2H), the ammoxidation rate is greater than 47%; the DO of the reaction tank C2 and the DO of the reaction tank C3 are controlled to be 2mg/L, and the aeration intensity is 3m3/(m2H), collecting the effluent water through opening valves E2 and E3 to a water outlet well, returning part of the effluent water of the water outlet well to a denitrification tank, discharging the rest effluent water through a water outlet pipeline, and enabling the load of the autotrophic denitrification filler film to reach 3.67 gN/(m) after the autotrophic denitrification filler film is discharged2D) corresponding to a volume loading of 1.46 kgN/(m)3D) denitrification pool BOD5The removal rate is 70 percent, and the surface load of the denitrification tank TN is 2.3 gN/(m)2D), opening the first sludge discharge port at the bottom of the distribution well every 10d to discharge sludge.
In the steps, the reflux ratio of the water outlet well is always controlled to be 300%, the stirring rotating speed of the denitrification tank is controlled to be 45r/min, and finally the total nitrogen removal rate of the whole system at the stable operation stage reaches 92%, wherein the total nitrogen removal rate contributed by the denitrification tank is 24%.
Example 2:
the anaerobic digestion effluent of landfill leachate of certain landfill plant is used as the inlet water with the water amount of 1300m3D, pH value of 7.8-8.3, water temperature mean value of 33 ℃, COD concentration mean value of inlet water of 920mg/L and BOD5The average concentration is 801mg/L, the average ammonia nitrogen concentration is 550mg/L, and the total effective volume of the reaction tank is 400m3The reaction tank is divided into four reaction tanks on average, and the effective volume of each reaction tank is 100m3Effective volume of denitrification tank is 200m3And the inlet water passes through the denitrification tank and then respectively enters four reaction tanks C1-C4.
Starting preparation, adding suspended carriers into the reaction tank and the denitrification tank, wherein the effective specific surface area of the carriers is 800m2/m3The porosity is 90 percent, the industrial standard of high density polyethylene suspension carrier for water treatment (CJ/T461-2014) is met, and the filling rate is 50 percent; inoculating aerobic sludge, wherein the sludge concentration in each reaction tank is about 4.7 g/L;
nitrosation and denitrification are started, a parallel operation mode is adopted, DO of each reaction tank is controlled to be 3.0-4.0mg/L, and the aeration intensity is 5.3m3/(m2H), collecting the effluent by opening the effluent valve E1-E4, returning part of the effluent well to the denitrification tank, discharging the rest effluent through the effluent pipe, opening a sludge discharge port at the bottom of the effluent well for a short time every day after 7 days of operation to discharge sludge, gradually losing the sludge, reducing the sludge concentration by no more than 20% every day, reducing the sludge concentration to about 0.9g/L after the operation to the 14 th reaction tank and the denitrification tank, operating until the ammonia oxidation rate reaches 57% at the 27 th day, and controlling the ammonia oxidation surface load to be 2.54 gN/(mNth) (m) after the operation to the 27 th reaction tank and the denitrification tank2D) denitrification pool BOD5The removal rate is 80 percent, and the next step is carried out;
autotrophic denitrification pre-starting, adopting a double-series A operation mode, controlling DO of 4mg/L and aeration intensity of 5m in reaction tanks C4 and C33/(m2H), the total ammoxidation rate of C4 and C3 reaches 90 percent; stirring in reaction tanks C1 and C2 at 30r/min, controlling DO at 1.7mg/L and aeration intensity at 3.5m3/(m2H), collecting the effluent water through opening valves E2 and E3, returning part of the effluent water from the effluent water well to a denitrification tank, discharging the rest effluent water through an effluent water pipeline, and after the operation for 15d, ensuring that the total ammonia oxidation rate of C1 and C2 reaches 85 percent and the ammonia oxidation surface load of C1 is 1.87gN/(m n)2D) denitrification pool BOD5The removal rate is 90 percent, and the next step is carried out;
starting autotrophic denitrification inoculation, adopting a double-series A operation mode, inoculating CANON suspension carrier to C1, controlling the inoculation rate to be 4%, controlling the stirring speed to be 20r/min, controlling the DO to be 0.5-1.0mg/L, and controlling the aeration intensity to be 2.5m3/(m2H). The effluent of the reaction tank C1 enters a reaction tank C2 through a communication valve M1, the stirring speed is controlled by C2 to be 20r/min, the DO is 1-2mg/L, and the aeration intensity is 3.5M3/(m2H). C3 and C4 control DO at 3-3.5mg/L, aeration intensity is 5.1m3/(m2H). Stirring in the denitrification tank at a rotating speed of 45r/min, collecting the effluent into an effluent well by opening valves E2 and E3, refluxing part of the effluent from the effluent well to the denitrification tank, and discharging the rest effluent through an effluent pipeline; the total ammoxidation rate of C3 and C4 is kept above 93 percent after the operation for 31 days, and the TN removal surface load of C1 exceeds 0.91 gN/(m)2D) denitrification pool BOD5The removal rate is 80 percent, and the next step is carried out;
autotrophic denitrification fed-batch start, adopting a double-series B operation mode, controlling DO at 3.5-4.0mg/L by C4 and controlling aeration intensity at 6m3/(m2H), the ammoxidation rate is maintained at about 75%. C1 controlling stirring speed at 30r/min, DO at 2.5-3.0mg/L and aeration intensity at 5.5m3/(m2H). C2 controlling stirring speed at 35r/min, DO at about 1.5mg/L and aeration intensity at 3.0m3/(m2H), C3 controlling the stirring speed to be 40r/min, DO to be about 2mg/L and the aeration intensity to be 3.0m3/(m2H). Collecting the effluent water to an effluent well by opening valves E3 and E4, returning part of the effluent water of the effluent well to a denitrification pool, discharging the rest effluent water through an effluent pipe, operating for 32 days, and removing the surface load of C2 TN to reach 1.72gN/(m < N >) (m < N >)2D) denitrification pool BOD5The removal rate is 80 percent, and the next step is carried out;
starting the autotrophic denitrification in an expanding way, and continuously feeding water by adopting a double-series A operation mode; displacing 50% of the suspension vehicle in the C4 and C3 reaction cells with the C1 and C2 reaction cells, respectively; the stirring speed of each reaction tank is controlled to be 30r/min, the DO is 2.5-3.0mg/L, and the aeration intensity is 4.5m3/(m2H), collecting the effluent by opening valves E2 and E3, returning part of the effluent from the effluent well to a denitrification tank, discharging the rest effluent through a water outlet pipe, and after running for 14 days, removing the surface load of each reaction tank TN by more than 2.25 gN/(mN/(m) m2D) denitrification pool BOD5The removal rate is 70 percent, and the next step is carried out;
the autotrophic nitrogen removal system runs stably, adopts a parallel running mode, controls DO of each reaction tank to be 3.5mg/L and controls aeration intensity to be 5.0m3/(m2H), collecting the effluent water through opening a valve E1-E4 to enable the effluent water to collect in an effluent well, enabling part of the effluent water of the effluent well to flow back to a denitrification pool, and enabling the rest effluent water to flow outThe water pipe is discharged, the total nitrogen removal rate of each reaction tank reaches 88 percent, and the maximum total nitrogen removal film load of each reaction tank reaches 3.59 gN/(m)2D) corresponding to a volume loading of 1.43 kgN/(m)3D) denitrification pool BOD5The removal rate is 70 percent, and the surface load of the denitrification tank TN is 1.92 gN/(m)2D), opening the first sludge discharge port at the bottom of the distribution well every 10d to discharge sludge.
In the steps, the reflux ratio of the water outlet well is always controlled to be 250%, the stirring rotating speed of the denitrification pool is controlled to be 45r/min in the starting process, and finally the total nitrogen removal rate of the whole system at the stable operation stage reaches 85%, wherein the total nitrogen removal rate contributed by the denitrification pool is 20%.
The invention realizes the serial, parallel or independent operation of the reaction tanks by controlling the water outlet directions of the four reaction tanks through the communicating valves; the autotrophic nitrogen removal process is quickly started by means of inoculation, fed-batch and the like; different process arrangement forms are realized according to the processing standard requirements.
The parts which are not described in the invention can be realized by taking the prior art as reference.
It is intended that any equivalents, or obvious variations, which may be made by those skilled in the art in light of the teachings herein, be within the scope of the present invention.

Claims (8)

1. The utility model provides a high-efficient autotrophic nitrogen removal system based on MBBR, its includes well, reaction tank main part, reflux unit, intercommunication device and aeration equipment, its characterized in that:
the reaction tank main body is provided with two rows of four reaction tanks, namely a first reaction tank, a second reaction tank, a third reaction tank and a fourth reaction tank, wherein the first reaction tank and the fourth reaction tank are arranged in a row and positioned at the bottom, and the first reaction tank and the second reaction tank are arranged in a row;
the central well is positioned in the center of the diagonal connection line of the four reaction tanks and comprises a denitrification tank, a water distribution well and a water outlet well, wherein the denitrification tank, the water distribution well and the water outlet well are concentric tank bodies and are sequentially a denitrification tank, a water distribution well and a water outlet well from inside to outside;
a water inlet of the denitrification tank is connected with a total water inlet pipeline, sewage to be treated enters the bottom of the denitrification tank through the total water inlet pipeline, and an interception screen is arranged at the upper part of the denitrification tank; sewage to be treated enters the distribution well through an interception screen on the upper part of the tank body of the denitrification tank, the distribution well is communicated with each reaction tank and is used for feeding water into each reaction tank, and a first sludge discharge port is formed in the bottom of the distribution well; the water outlet well is used for collecting the effluent of the four reaction tanks and discharging the effluent through a water outlet pipeline at the upper part of the water outlet well, and the bottom of the water outlet well is provided with a second sludge discharge port; an intercepting screen is arranged at the water outlet of each reaction tank;
the first reaction tank and the second reaction tank, the second reaction tank and the third reaction tank, the third reaction tank and the fourth reaction tank, and the fourth reaction tank and the first reaction tank are respectively connected through a first connecting pipeline, a second connecting pipeline, a third connecting pipeline and a fourth connecting pipeline;
the communication device comprises a communication valve, and the communication valve comprises a first communication valve positioned on the first connecting pipeline, a second communication valve positioned on the second connecting pipeline, a third communication valve positioned on the third connecting pipeline and a fourth communication valve positioned on the fourth connecting pipeline; a first water inlet and a fourth water inlet are respectively arranged above the first reaction tank and the fourth reaction tank close to the central well, a second water inlet and a third water inlet are respectively arranged below the second reaction tank and the third reaction tank close to the central well, and water is respectively fed into the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank through the first water inlet, the second water inlet, the third water inlet and the fourth water inlet;
stirring devices are arranged in the denitrification tank and each reaction tank;
the reflux device comprises a reflux pump which is arranged on a reflux pipe connected with the bottom of the water outlet well, and the other end of the reflux pipe is communicated with the denitrification tank;
the aeration devices are distributed in each reaction tank, and suspended carriers are added into the denitrification tank and each reaction tank; the specific gravity of the suspension carrier is 0.93-0.97, and the void ratio is more than 90%.
2. The MBBR-based high efficiency autotrophic nitrogen removal system according to claim 1, wherein: the first water inlet, the second water inlet, the third water inlet and the fourth water inlet are respectively connected with the water distribution well through a first water inlet pipeline, a second water inlet pipeline, a third water inlet pipeline and a fourth water inlet pipeline, a first water inlet valve is arranged on the first water inlet pipeline, a second water inlet valve is arranged on the second water inlet pipeline, a third water inlet valve is arranged on the third water inlet pipeline, and a fourth water inlet valve is arranged on the fourth water inlet pipeline; the interception screen cloth positioned at the water outlet of the reaction tank comprises a first interception screen cloth positioned in the first reaction tank, a second interception screen cloth positioned in the second reaction tank, a third interception screen cloth positioned in the third reaction tank and a fourth interception screen cloth positioned in the fourth reaction tank.
3. The MBBR-based high efficiency autotrophic nitrogen removal system according to claim 1, wherein: the aeration device in each reaction tank consists of a plurality of groups of perforated aeration pipes and microporous aeration pipes.
4. The MBBR-based high efficiency autotrophic nitrogen removal system according to claim 2, wherein: the water outlet ends of the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank are respectively connected with the water outlet well through a first water outlet pipeline, a second water outlet pipeline, a third water outlet pipeline and a fourth water outlet pipeline, and a first water outlet valve, a second water outlet valve, a third water outlet valve and a fourth water outlet valve are correspondingly arranged on the first water outlet pipeline, the second water outlet pipeline, the third water outlet pipeline and the fourth water outlet pipeline.
5. The method of claim 4, wherein the method comprises the following three control modes:
first, parallel operating mode:
the first reaction tank, the second reaction tank, the third reaction tank and the fourth reaction tank are in parallel relation, each reaction tank independently feeds water and independently discharges water, and the discharged water is collected to a water outlet well by controlling a relevant valve and is discharged through a water outlet pipeline;
second, dual series a mode of operation:
the sewage to be treated passes through the denitrification tank, enters the distribution well through an interception screen on the upper part of a tank body of the denitrification tank, continuously enters the first reaction tank and the fourth reaction tank through the first water inlet and the fourth water inlet respectively, water in the first reaction tank enters the second reaction tank by controlling related valves, so that water in the fourth reaction tank enters the third reaction tank, is finally collected to the water outlet well and is discharged through the water outlet pipeline;
third, dual series B mode of operation:
the first reaction tank, the second reaction tank and the third reaction tank are in a group, the fourth reaction tank is in a group, sewage to be treated passes through the denitrification tank, enters the distribution well through the interception screen on the upper part of the tank body of the denitrification tank, continuously enters the first reaction tank and the fourth reaction tank through the first water inlet and the fourth water inlet respectively, water in the first reaction tank sequentially enters the second reaction tank and the third reaction tank by controlling the relevant valves, and finally, the discharged water is collected to the water outlet well and is discharged through the water outlet pipeline.
6. The operating method of the MBBR-based high efficiency autotrophic nitrogen removal system according to claim 5, wherein the parallel operation mode comprises the following specific steps: the sewage to be treated enters the denitrification tank through a water inlet of the denitrification tank, enters the distribution well through the interception screen on the upper part of the tank body of the denitrification tank, then continuously enters each reaction tank through the first water inlet valve, the second water inlet valve, the third water inlet valve, the fourth water inlet valve, the first water inlet, the second water inlet, the third water inlet and the fourth water inlet, the effluent water respectively passes through the first interception screen, the second interception screen, the third interception screen and the fourth interception screen, then is discharged into a water outlet well through respective water outlet valves, and finally is discharged through a water outlet pipeline.
7. The operating method of the MBBR-based high efficiency autotrophic nitrogen removal system according to claim 5, wherein the specific steps of the double series A operating mode are as follows: the sewage to be treated enters a denitrification tank through a water inlet of the denitrification tank, enters a distribution well through an interception screen on the upper part of a tank body of the denitrification tank, then continuously enters a first reaction tank and a fourth reaction tank through a first water inlet valve, a fourth water inlet valve, a first water inlet and a fourth water inlet respectively, the effluent of the first reaction tank enters a second reaction tank through the first interception screen, a first communication valve and a second interception screen, and is converged into a water outlet well through the second interception screen and a second water outlet valve to be discharged through a water outlet pipeline; and the water outlet of the fourth reaction tank enters a third reaction tank through a fourth interception screen, a third communication valve and a third interception screen, and the water outlet of the third reaction tank converges into a water outlet well after passing through a third interception screen and a third water outlet valve, and then is discharged through a water outlet pipeline.
8. The operating method of the MBBR-based high efficiency autotrophic nitrogen removal system according to claim 5, wherein the specific steps of the double series B operating modes are as follows: the sewage to be treated enters a denitrification tank through a water inlet of the denitrification tank, enters a distribution well through an interception screen on the upper part of a tank body of the denitrification tank, then continuously enters a first reaction tank and a fourth reaction tank through a first water inlet valve, a fourth water inlet valve, a first water inlet and a fourth water inlet respectively, the effluent of the first reaction tank enters a second reaction tank through a first interception screen, a first communicating valve and a second interception screen, the effluent of the second reaction tank enters a third reaction tank through a second interception screen, a second communicating valve and a third interception screen, and the effluent of the third reaction tank is collected to a water outlet well through a third interception screen and a third water outlet valve and then is discharged through a water outlet pipeline; and the water discharged from the fourth reaction tank is converged into a water outlet well through a fourth interception screen and a fourth water outlet valve and is discharged through a water outlet pipeline.
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