CN112551822B - MBBR (moving bed biofilm reactor) system for enhanced ammonia nitrogen treatment of flocculation sedimentation tank and operation method - Google Patents

MBBR (moving bed biofilm reactor) system for enhanced ammonia nitrogen treatment of flocculation sedimentation tank and operation method Download PDF

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Publication number
CN112551822B
CN112551822B CN202011522655.7A CN202011522655A CN112551822B CN 112551822 B CN112551822 B CN 112551822B CN 202011522655 A CN202011522655 A CN 202011522655A CN 112551822 B CN112551822 B CN 112551822B
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aeration
water outlet
zone
area
reaction zone
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CN112551822A (en
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吴迪
韩文杰
周家中
黄子进
管勇杰
李新利
刘宜龙
路晖
李洪禹
都松东
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Qingdao Spring Water Treatment Co ltd
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Qingdao Spring Water Treatment 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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • 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
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • 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
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • 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
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • 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
    • 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
    • C02F3/10—Packings; Fillings; Grids
    • 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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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Activated Sludge Processes (AREA)

Abstract

The invention discloses a flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system and an operation method thereof, and relates to the technical field of water treatment. The flocculation reaction device comprises a reaction tank, a total water inlet pipeline and a total water outlet pipeline, wherein the reaction tank is internally and sequentially divided into a flocculation reaction zone, a sedimentation zone, an aeration reaction zone and a water outlet zone from front to back, the total water inlet pipeline is connected to a tank body of the flocculation reaction zone, the total water outlet pipeline is connected to a tank body of the water outlet zone, and water to be treated enters from the total water inlet pipeline and is discharged through the total water outlet pipeline after sequentially passing through the flocculation reaction zone, the sedimentation zone, the aeration reaction zone and the water outlet zone. Jet flow aerators are arranged in mud passing channels right below a guide wall of the water outlet area and right below a front tank wall of the aeration reaction area, mud discharge is promoted in the water outlet area through jet flow aeration, an interception screen mesh at the bottom of the aeration reaction area is prolonged, and the normal exhaust of the jet flow aerators in the water outlet area is ensured. The invention can remove ammonia nitrogen and TP, COD, SS in the water to be treated, thereby realizing purification.

Description

MBBR (moving bed biofilm reactor) system for enhanced ammonia nitrogen treatment of flocculation sedimentation tank and operation method
Technical Field
The invention relates to the technical field of water treatment, in particular to a flocculation precipitation tank enhanced ammonia nitrogen treatment MBBR system and an operation method.
Background
Ammonia nitrogen, COD and SS are used as conventional control parameters in sewage treatment, and the discharge concentration is an important index for measuring the sewage treatment effect. Currently, the sewage treatment process requires three stages of treatment to reach the discharge standard, wherein the influent SS and insoluble COD are mainly removed by primary treatment through precipitation, filtration or proper aeration. The ammonia nitrogen and the soluble COD are removed by the aerobic oxidation of an aeration tank with the activated sludge through the secondary treatment, and meanwhile, in order to ensure that the introduced activated sludge does not run off along with the effluent, a sedimentation tank with a larger tank capacity is matched for carrying out gravity sedimentation on the activated sludge; after secondary treatment, common sewage still contains SS and COD which is difficult to biodegrade, so that the common sewage needs to be further removed by adding tertiary treatment through a chemical method or a physical method, and finally reaches the emission standard. The common sewage three-stage treatment has the advantages of simple operation and maintenance, good treatment effect and the like, and is widely applied, but the treatment efficiency is limited by long process flow, large occupied area, high operation cost, poor impact resistance and the like. Aiming at the problems, if the sewage treatment process flow can be simplified and the secondary treatment efficiency is improved, the sewage treatment effect can be fundamentally improved.
The related research reports of the prior art mainly include:
CN 111847804A discloses a domestic sewage treatment system, before this system advanced treatment including sewage collecting tank, equalizing basin, A2/O reaction tank, MBR reaction module pond etc. sewage flows into equalizing basin, A2/O reaction tank in proper order after the grid treatment in the collecting tank, and the sewage after the treatment of A2/O reaction tank is pumped into the MBR reaction module pond, gets rid of COD and holds back and filters most particulate matter and virus bacterium, and the water body gets into advanced treatment after the MBR reaction module pond treatment. Although the system can remove pollutants in domestic sewage and has more intensive process flow, the membrane assemblies of the A2/O reaction tank are subjected to mud-water separation, and the membrane price and the membrane replacement cost are high, so that the operation cost is high. In addition, the back flushing needs to be performed in time after the MBR membrane is blocked, so that the stability of the process operation is reduced.
CN 207259344U discloses a compact combined sewage treatment system with small occupied area, which comprises a grid separation tank, a regulating tank, a combined sewage treatment device, a filtering tank and an external drain pipe, wherein the combined sewage treatment device comprises a pump station positioned at the upper part and a combined sewage treatment unit positioned at the lower part, and the combined sewage treatment unit comprises a small anaerobic tank, a large aerobic tank, a primary sedimentation tank, a secondary sedimentation tank, a flocculation tank, a tertiary sedimentation tank, a filtering tank and a clean water tank. Although the process can be integrally formed, the process has a certain intensive type, the production cost is reduced to a certain extent, but the process flow is too complex, and the adopted activated sludge process needs three sedimentation tanks for sedimentation, so that the occupied area of the system is greatly increased.
Disclosure of Invention
The invention aims to provide an enhanced ammonia nitrogen treatment MBBR system of a flocculation sedimentation tank, water to be treated is discharged through a total water outlet pipeline after sequentially passing through a flocculation reaction zone, a sedimentation zone, an aeration reaction zone and a water outlet zone, mud discharge is promoted in the water outlet zone through jet aeration, an interception screen at the bottom of the aeration reaction zone is prolonged, normal exhaust of a jet aerator in the water outlet zone is ensured, and ammonia nitrogen and TP, COD, SS in the water to be treated can be removed and purified.
The technical proposal comprises:
the flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system comprises a reaction tank, a total water inlet pipeline and a total water outlet pipeline, wherein the reaction tank is sequentially divided into a flocculation reaction area, a sedimentation area, an aeration reaction area and a water outlet area from front to back, the total water inlet pipeline is connected to a tank body of the flocculation reaction area, the total water outlet pipeline is connected to a tank body of the water outlet area, and water to be treated enters from the total water inlet pipeline and is discharged through the total water outlet pipeline after sequentially passing through the flocculation reaction area, the sedimentation area, the aeration reaction area and the water outlet area;
the bottom of the reaction tank in the flocculation reaction zone is designed horizontally, the bottom of the reaction tank corresponding to the position from the water outlet zone to the sedimentation zone is designed obliquely downwards and forms a slope, the range of the slope is 2-5%, the bottom of the reaction tank in the sedimentation zone is lowest, and a sludge collecting hopper is arranged at the lowest position of the bottom of the reaction tank; the bottom of the aeration reaction zone is obliquely designed upwards from the water outlet end to the water inlet end to form another gradient, the range of the another gradient is 2-5%, and a mud passing channel is arranged between the bottom of the aeration reaction zone and the bottom of the reaction tank;
a suspension carrier and an aeration pipeline are arranged in the aeration reaction zone, a first interception screen is arranged at the bottom of the water inlet end of the aeration reaction zone, and a biological film falling off in the aeration reaction zone enters the mud passing channel through the first interception screen arranged at the bottom of the aeration reaction zone and flows to a mud collecting hopper in the sedimentation zone along the mud passing channel;
the device is characterized in that a guide wall is arranged in the water outlet area, jet flow aerators are arranged in mud passing channels right below the guide wall and right below the front pool wall of the aeration reaction area, jet flow aeration baffles are arranged right above each jet flow aerator at intervals, and biological membranes falling off in the water outlet area enter the mud passing channels and flow to the mud collecting hopper along the mud passing channels.
In the scheme, the bottom of the reaction tank in the flocculation reaction zone is designed horizontally, and the bottom of the reaction tank corresponding to the position from the water outlet zone to the sedimentation zone is designed obliquely downwards, so that falling biological films settled at the bottoms of the aeration reaction zone and the water outlet zone can move along the bottom of the system tank to the bottom of the water inlet end of the sedimentation zone.
As a preferable scheme of the invention, the total water inlet pipeline is connected to the tank body at the upper part of the flocculation reaction zone, the total water outlet pipeline is connected to the tank body at the upper part of the water outlet zone, and the flocculation reaction zone and the sedimentation zone are communicated through a water distribution wall.
As another preferable scheme of the invention, the upper part of the water outlet end of the sedimentation zone is provided with a water outlet weir, the upper edge of the water outlet weir is lower than the running water level, and water is discharged into the aeration reaction zone through the water outlet weir.
Further preferably, a second interception screen is arranged between the aeration reaction zone and the water outlet zone, and the aeration reaction zone and the water outlet zone are communicated through the second interception screen; the aeration pipeline is provided with aeration valves, the arrangement mode of the aeration pipeline is kept vertical to the water flowing direction, and the aeration pipeline is provided with a plurality of aeration pipelines which are arranged in an uneven arrangement mode and gradually densely along the water flowing direction.
Further preferably, the width of the first interception screen is consistent with the width of the bottom of the aeration reaction zone, and the length is 15-25% of the length of the bottom of the aeration reaction zone.
Preferably, the upper end of the guide wall is higher than the liquid level in the system, the vertical distance between the lower end of the guide wall and the bottom of the water outlet area is 1.0-1.5 m, a mud passing baffle is arranged between the mud passing channel and the sedimentation area, the upper part of the mud passing baffle is connected with the front end of the first interception screen, the lower part of the mud passing baffle extends towards the sedimentation area, the mud passing baffle forms an included angle of 45-60 degrees with the vertical direction, and the horizontal length of the mud passing baffle is smaller than that of the water outlet weir.
Preferably, the jet aeration baffle plate positioned right below the front tank wall of the aeration reaction zone is connected at 80% -90% of the length of the first interception screen, the jet aeration baffle plate positioned right below the front tank wall of the aeration reaction zone is parallel to the mud passing baffle plate, and the vertical distance between the jet aerator positioned in the water outlet zone and the jet aeration baffle plate corresponding to the jet aerator is kept the same as the vertical distance between the jet aerator positioned in the aeration reaction zone and the jet aeration baffle plate corresponding to the jet aerator.
Preferably, the minimum height of the mud passing channel is not less than 0.5m.
The invention also aims to provide an operation method of the flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system, which sequentially comprises the following steps:
s1, water to be treated enters a flocculation reaction zone from the total water inlet pipeline, and enters an aeration reaction zone after passing through a precipitation zone;
s2, in the aeration reaction zone, the concentration of suspended sludge is less than 400mg/L, no sludge reflux is arranged, and active sludge is not enriched; the density of the suspension carrier is 0.96-0.98 g/cm 3 The effective specific surface area is 450-1200 m 2 /m 3 The filling rate is 20-60%, the nitrification load of the suspension carrier is 0.1-0.8 gN/m 2 /d; after sewage to be treated enters an aeration reaction zone, an aeration valve on a first aeration pipe of the aeration reaction zone is regulated to realize intermittent aeration according to the COD concentration of the inflow water, and when the COD of the inflow water is more than or equal to 500mg/L, the aeration interval time of the first aeration pipe is 0.5-1.0 h; when the COD of the inflow water is 200-500 mg/L, the aeration stopping interval time of the first aeration pipe is 1.0-1.5 h; when the COD of the inflow water is 100-200 mg/L, the aeration stopping interval time of the first aeration pipe is 1.5-2 h; when COD of the inflow water is less than 100mg/L, the aeration stopping interval time of the first aeration pipe is 2-2.5 h;
s3, the falling biological film enters the bottoms of the mud passing channel and the water outlet area through the first interception screen and the bottoms of the water outlet area respectively, a jet aerator is started to accelerate the movement of the bottoms of the water outlet end of the sedimentation area and the sludge in the mud passing channel to the bottom of the first mud collecting hopper in the sedimentation area, the jet aerator operates intermittently, the aeration flow is consistent with the aeration flow of the first aeration pipe, the operation time is controlled according to the intermittent aeration time of the first aeration pipe, when the aeration stop interval time of the first aeration pipe is 0.5-1.0 h, and the operation time of the jet aerator is 5min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 1.0-1.5 h, the running time of the jet aerator is 3min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 1.5-2 h, the running time of the jet aerator is 2min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 2-2.5 h, the running time of the jet aerator is 1min before the first aeration pipe resumes aeration.
Compared with the prior art, the invention has the following beneficial technical effects:
1) The flocculation and precipitation area is combined with the aeration reaction area through the design of the mud passage, so that ammonia nitrogen, COD and SS can be removed at the same time, and the defect that the traditional process needs three-stage processes for removing pollutants is overcome;
2) The occupied area is saved, the biochemical section adopts a pure membrane MBBR process, the treatment load is higher than that of the traditional activated sludge method, the occupied area of the same treatment capacity is saved, and the occupied area of a secondary sedimentation tank is saved compared with that of the traditional process;
3) The effluent water quality is good, and the falling biological film of the aeration reaction zone can be effectively intercepted by the design of the interception screen mesh at the bottom of the aeration reaction zone and the mud-passing channel of the effluent zone, so that the effluent water is ensured to reach the standard on ammonia nitrogen, COD and SS stably;
4) The jet aerator is arranged at the bottom of the water outlet area, so that the sludge passing through the sludge channel and the sludge at the bottom of the water outlet area can be intermittently and intensively discharged into the bottom of the sedimentation area, and the problem that the sludge does not move smoothly to the sedimentation area is solved. The design of the mud passing baffle and the jet aeration baffle can prevent mud flocs from being scattered in the mud passing channel and not easy to settle when the jet aerator is started, so that simple operation is realized.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a front view of a flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system;
FIG. 2 is a top view of a flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system of the present invention;
in the figure:
A. flocculation reaction zone, B, sedimentation zone, C, aeration reaction zone, D, water outlet zone, E, guide wall, F, sludge collecting hopper, G, first interception screen, H, suspension carrier, S1, total water inlet pipeline, S2, total water outlet pipeline, J, mud passing baffle, K, water outlet weir, L, water distribution wall, M, second interception screen, N, mud passing channel, O, aeration pipeline, i1, reaction tank bottom slope corresponding to sedimentation zone, i2, aeration reaction zone bottom slope, P, jet aerator, Q, jet aeration baffle.
Detailed Description
The invention provides a flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system and an operation method thereof, and in order to make the advantages and the technical scheme of the invention clearer and more definite, the invention is described in detail below with reference to specific embodiments.
The invention relates to a Moving Bed Biofilm Reactor (MBBR), which refers to a moving bed biofilm reactor MBBR (Moving Bed Biofilm Reactor), and the method utilizes biofilm growing on a suspension carrier to enrich functional microorganisms by adding a certain amount of suspension carrier into the system, so as to improve biomass and biological species in a treatment system, thereby improving the treatment efficiency of the system.
The water distribution wall is provided with a plurality of small holes, and the flocculation reaction area and the sedimentation area are communicated through the small holes.
The "flocculation reaction zone" referred to in the present invention is a solid-liquid separation by adding a flocculant thereto.
As used herein, the term "settling zone" refers to the removal of suspended matter from water by the action of gravity.
The filling rate refers to the filling rate of the suspension carrier, namely the ratio of the volume of the suspension carrier to the cell capacity of a filling area, wherein the volume of the suspension carrier is the total volume of the suspension carrier in natural accumulation; such as 100m 3 Suspending carrier, filling to 400m 3 Pool volume, filling rate is 25%.
The jet aerator disclosed by the invention is connected with a compressed air pipeline through a link with a water pump, so that water flow injection is realized to generate fine bubbles, air in the bubbles is fully contacted with water, and oxygen is dissolved in the water, thereby achieving the effect of aeration.
Referring to fig. 1 and 2, the invention provides a flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system, which comprises a reaction tank, a total water inlet pipeline S1, a total water outlet pipeline S2, a suspension carrier H and accessory components.
The reaction tank is sequentially divided into a flocculation reaction area A, a sedimentation area B, an aeration reaction area C and a water outlet area D from front to back, a total water inlet pipeline S1 is connected to the tank body of the flocculation reaction area, a total water outlet pipeline S2 is connected to the tank body of the water outlet area, water to be treated enters from the total water inlet pipeline, and after sequentially passing through the flocculation reaction area, the sedimentation area, the aeration reaction area and the water outlet area, the water is discharged through the total water outlet pipeline, and ammonia nitrogen and TP, COD, SS in the water to be treated are removed to realize purification; the total water outlet pipeline is positioned at the upper part of the water outlet area, and the central elevation is the same as the liquid level in the system.
As a main improvement point of the invention, the bottom of the reaction tank in the flocculation reaction zone is designed horizontally, the bottom of the reaction tank corresponding to the position from the water outlet zone D to the sedimentation zone B is designed obliquely downwards and forms a gradient, namely the gradient i1 of the bottom of the reaction tank corresponding to the water outlet zone to the sedimentation zone, the gradient ranges from 2% to 5%, the bottom of the reaction tank near one side of the water outlet zone is high, the bottom of the reaction tank at the sedimentation zone is lowest, and a sludge hopper F is arranged at the lowest position of the bottom of the reaction tank; the bottom of the aeration reaction zone is obliquely designed upwards from the water outlet end to the water inlet end to form another gradient, namely the gradient i2 of the bottom of the aeration reaction zone, the gradient ranges from 2 to 5 percent, and a mud passing channel N is arranged between the bottom of the aeration reaction zone and the bottom of the reaction tank; the position of the tank bottom close to the sedimentation area is low, so that the biological film which is designed to be convenient to fall off flows into the sludge collecting hopper of the sedimentation area through the sludge passage N.
The auxiliary components comprise a water outlet weir K, a guide wall E, a mud passing baffle J, an aeration pipeline O, an aeration valve, a first interception screen G and a second interception screen M, wherein the water outlet weir K is arranged at the upper part of the water outlet end of the sedimentation zone, water outlet of the water outlet weir enters the aeration reaction zone, and the upper edge of the water outlet weir is lower than the running water level; the guide wall E is positioned in the water outlet area D, the upper end of the guide wall is higher than the liquid level in the system, the water cannot be discharged, and the vertical distance between the lower end of the guide wall E and the bottom of the water outlet area is 1.0-1.5 m.
The mud passing baffle J is positioned between the mud passing channel and the sedimentation zone, the upper part of the mud passing baffle is connected with the bottom of the aeration reaction zone tank, the connecting point is the front end of the first interception screen, the lower part extends to the bottom of the sedimentation zone and forms an included angle of 45-60 degrees with the vertical direction, and the horizontal length of the mud passing baffle is not greater than the horizontal length of the water outlet weir.
As another improvement point of the invention, jet flow aerators P are arranged in the mud passing channels right below the guide wall and right below the front pool wall of the aeration reaction zone, jet flow aeration baffles Q are arranged right above each jet flow aerator at intervals, and the biological film falling off in the water outlet zone enters the mud passing channel and flows to the mud collecting hopper along the mud passing channel. The jet aeration baffle plate positioned right below the front tank wall of the aeration reaction zone is connected to the position 80% -90% of the length of the first interception screen, the jet aeration baffle plate positioned right below the front tank wall of the aeration reaction zone is parallel to the mud passing baffle plate, and the vertical distance between the jet aerator positioned in the water outlet zone and the jet aeration baffle plate corresponding to the jet aerator is kept the same as the vertical distance between the jet aerator positioned in the aeration reaction zone and the jet aeration baffle plate corresponding to the jet aerator.
As a main improvement point of the invention, a suspension carrier and an aeration pipeline are arranged in an aeration reaction zone, a first interception screen is arranged at the bottom of the aeration reaction zone, and a biological film falling off in the aeration reaction zone enters the mud passing channel through the first interception screen arranged at the bottom of the aeration reaction zone and flows to a mud collecting hopper in the sedimentation zone along the mud passing channel; preferably, the first interception screen is positioned at the bottom of the water inlet end tank of the aeration reaction zone, the width of the first interception screen is consistent with that of the aeration reaction zone, and the length of the first interception screen is 15-25% of that of the aeration reaction zone.
The biological film falling off from the water outlet area enters the mud passing channel and flows to the mud collecting hopper along the mud passing channel.
The mud passing channel is positioned at the lower part of the aeration reaction zone, is separated from the aeration reaction zone through the bottom of the aeration reaction zone, and is communicated with the aeration reaction zone through a first interception screen of the aeration reaction zone, and the minimum height of the mud passing channel is not less than 0.5m.
The aeration pipeline is arranged vertically to the water flowing direction, the arrangement is uneven, the arrangement is gradually dense along the water flowing direction, and the main pipe and the branch pipe of the aeration pipe are provided with aeration valves.
The second interception screen M is positioned at the upper part of the water outlet end of the aeration reaction zone, and the aeration reaction zone is communicated with the water outlet zone through the second interception screen M.
The flocculation reaction zone A and the sedimentation zone B are communicated through a water distribution wall L.
The operation method of the MBBR transformation system for the enhanced ammonia nitrogen treatment of the flocculation sedimentation tank is described in detail below.
The specific operation method is as follows:
firstly, water to be treated enters a flocculation reaction zone from the total water inlet pipeline, and enters an aeration reaction zone after passing through a precipitation zone;
secondly, in the aeration reaction zone, the concentration of suspended sludge is less than 400mg/L, no sludge reflux is arranged, and the activated sludge is not enriched; the density of the suspension carrier is 0.96-0.98 g/cm 3 The effective specific surface area is 450-1200 m 2 /m 3 The filling rate is 20-60%, the nitrification load of the suspension carrier is 0.1-0.8 gN/m 2 /d; after sewage to be treated enters an aeration reaction zone, an aeration valve on a first aeration pipe of the aeration reaction zone is regulated to realize intermittent aeration according to the COD concentration of the inflow water, and when the COD of the inflow water is more than or equal to 500mg/L, the aeration interval time of the first aeration pipe is 0.5-1.0 h; when the COD of the inflow water is 200-500 mg/L, the aeration stopping interval time of the first aeration pipe is 1.0-1.5 h; when the COD of the inflow water is 100-200 mg/L, the aeration stopping interval time of the first aeration pipe is 1.5-2 h; when COD of the inflow water is less than 100mg/L, the aeration stopping interval time of the first aeration pipe is 2-2.5 h;
thirdly, the falling biological film enters the bottoms of the mud passing channel and the water outlet area through the first interception screen and the bottoms of the water outlet area respectively, a jet aerator is started to accelerate the movement of the bottom of the water outlet end of the sedimentation area and the sludge in the mud passing channel to the bottom of the first mud collecting hopper in the sedimentation area, the jet aerator operates intermittently, the aeration flow is consistent with the aeration flow of the first aeration pipe, the operation time is controlled according to the intermittent aeration time of the first aeration pipe, when the aeration stopping time of the first aeration pipe is 0.5-1.0 h, and the operation time of the jet aerator is 5min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 1.0-1.5 h, the running time of the jet aerator is 3min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 1.5-2 h, the running time of the jet aerator is 2min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 2-2.5 h, the running time of the jet aerator is 1min before the first aeration pipe resumes aeration.
The present invention will be described in detail with reference to specific examples.
Example 1:
emergency project for sewage treatment with design water quantity of 3 ten thousand meters 3 /d, COD and NH of the incoming water 3 SS design values are 250, 30 and 200mg/L respectively, a flocculation sedimentation tank is adopted to strengthen an ammonia nitrogen treatment MBBR system, a suspension carrier is added into an aeration reaction zone, and the density of the suspension carrier is 0.98g/cm 3 An effective specific surface area of 800m 2 /m 3 The filling rate is 40%; the width of the first interception screen at the bottom of the aeration reaction zone is consistent with the width of the bottom of the aeration reaction zone, and the length is 15% of the length of the bottom of the aeration reaction zone; a diversion wall is arranged in the water area, and the vertical distance between the lower end of the diversion wall and the bottom of the water outlet area is 1.5m; a mud passing baffle plate which forms an included angle of 45 degrees with the vertical direction is arranged between the mud passing channel and the sedimentation zone; when the system is in operation, water to be treated enters the flocculation reaction zone from the total water inlet pipeline, enters the aeration reaction zone after passing through the precipitation zone, and adjusts an aeration valve on a first aeration pipe of the aeration reaction zone to enable the aeration interval time of stopping the aeration of the first aeration pipe to be 1.5h; the water treated in the aeration reaction zone is discharged through a water outlet zone by a total water outlet pipeline connected with the water outlet zone, and the residual sludge is discharged by a sludge collecting bucket. After passing through the water outlet area, the effluent COD and NH 3 The average value of SS is 11.52, 1.90 and 3.3mg/L respectively. The falling biological film enters the bottoms of the mud passing channel and the water outlet region through the first interception screen and the bottom of the water outlet region respectively, the jet aerator is started to accelerate the movement of the bottom of the water outlet region and the sludge in the mud passing channel to the bottom of the sludge collecting hopper in the sedimentation region, the sludge discharge pump is operated intermittently, the operation time is 3min before the first aeration pipe is recovered to be aerated, and the aeration flow is consistent with the flow of the first aeration pipe. And discharging the residual sludge from the sludge collecting hopper.
Example 2:
integrated sewage treatment device with design water quantity of 350m 3 /d, COD and NH of the incoming water 3 The SS design values are 150 mg/L, 20 mg/L and 200mg/L respectively, and an efficient flocculation sedimentation tank is adopted to strengthen an ammonia nitrogen treatment MBBR system, wherein a suspension carrier is added into an aeration reaction zone, and the density of the suspension carrier is 0.98g/cm 3 An effective specific surface area of 800m 2 /m 3 The filling rate is 30%; the width of the first interception screen at the bottom of the aeration reaction zone is consistent with the width of the bottom of the aeration reaction zone, and the length is 15% of the length of the bottom of the aeration reaction zone; a diversion wall is arranged in the water area, and the vertical distance between the lower end of the diversion wall and the bottom of the water outlet area is 1.0m; a mud passing baffle plate which forms an included angle of 55 degrees with the vertical direction is arranged between the mud passing channel and the sedimentation zone; when the system is in operation, water to be treated enters the flocculation reaction zone from the total water inlet pipeline, enters the aeration reaction zone after passing through the sedimentation zone, and adjusts an aeration valve on a first aeration pipe of the aeration reaction zone to stop the aeration interval time of the first aeration pipe to be 2 hours; the water treated in the aeration reaction zone is discharged from a total water outlet pipeline connected with the water outlet zone through the water outlet zone, and after passing through the water outlet zone, the water is discharged into COD and NH 3 The average value of SS is 38.25, 0.86 and 7.98mg/L respectively.
The falling biological film enters the bottoms of the mud passing channel and the water outlet region through the first interception screen and the bottom of the water outlet region respectively, a jet aerator is started to accelerate the movement of the water outlet region and the mud in the mud passing channel to the bottom of a mud collecting hopper in the sedimentation region, the jet aerator operates intermittently, the operation time is 2 minutes before the first aeration pipe resumes aeration, and the aeration flow is consistent with that of the first aeration pipe. And discharging the residual sludge from the sludge collecting hopper.
The parts not described in the invention can be realized by referring to the prior art.
It should be noted that: any equivalent or obvious modifications made by those skilled in the art under the teachings of this specification shall fall within the scope of this invention.

Claims (6)

1. The operation method of the flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system is characterized in that the flocculation sedimentation tank enhanced ammonia nitrogen treatment MBBR system comprises a reaction tank, a total water inlet pipeline and a total water outlet pipeline, wherein the reaction tank is sequentially divided into a flocculation reaction area, a sedimentation area, an aeration reaction area and a water outlet area from front to back, the total water inlet pipeline is connected to a tank body of the flocculation reaction area, the total water outlet pipeline is connected to a tank body of the water outlet area, and water to be treated enters from the total water inlet pipeline and is discharged through the total water outlet pipeline after sequentially passing through the flocculation reaction area, the sedimentation area, the aeration reaction area and the water outlet area;
the bottom of the reaction tank in the flocculation reaction zone is designed horizontally, the bottom of the reaction tank corresponding to the position from the water outlet zone to the sedimentation zone is designed obliquely downwards and forms a slope, the range of the slope is 2-5%, the bottom of the reaction tank in the sedimentation zone is lowest, and a sludge collecting hopper is arranged at the lowest position of the bottom of the reaction tank; the bottom of the aeration reaction zone is obliquely designed upwards from the water outlet end to the water inlet end to form another gradient, the range of the another gradient is 2-5%, and a mud passing channel is arranged between the bottom of the aeration reaction zone and the bottom of the reaction tank;
a suspension carrier and an aeration pipeline are arranged in the aeration reaction zone, a first interception screen is arranged at the bottom of the aeration reaction zone, and a biological film falling off in the aeration reaction zone enters the mud-passing channel through the first interception screen arranged at the bottom of the water inlet end of the biological film and flows to a mud collecting hopper in the sedimentation zone along the mud-passing channel;
a flow guide wall is arranged in the water outlet area, jet flow aerators are arranged in mud passing channels right below the flow guide wall and right below the front pool wall of the aeration reaction area, a jet flow aeration baffle is arranged right above each jet flow aerator at a certain distance, and the biological film falling off in the water outlet area enters the mud passing channel and flows to the mud collecting hopper along the mud passing channel;
a second interception screen is arranged between the aeration reaction area and the water outlet area, and the aeration reaction area and the water outlet area are communicated through the second interception screen; the aeration pipeline is provided with aeration valves, the arrangement mode of the aeration pipeline is kept vertical to the water flowing direction, and the aeration pipeline is provided with a plurality of aeration pipelines which are arranged in an uneven arrangement mode and gradually densely along the water flowing direction;
the width of the first interception screen is consistent with the width of the bottom of the aeration reaction zone, and the length of the first interception screen is 15-25% of the length of the bottom of the aeration reaction zone;
the operation method sequentially comprises the following steps:
s1, water to be treated enters a flocculation reaction zone from the total water inlet pipeline, and enters an aeration reaction zone after passing through a precipitation zone;
s2, in the aeration reaction zone, the concentration of suspended sludge is less than 400mg/L, no sludge reflux is arranged, and active sludge is not enriched; the density of the suspension carrier is 0.96-0.98 g/cm 3 The effective specific surface area is 450-1200 m 2 /m 3 The filling rate is 20-60%, the nitrification load of the suspension carrier is 0.1-0.8 gN/m 2 /d; after sewage to be treated enters an aeration reaction zone, an aeration valve on a first aeration pipe of the aeration reaction zone is regulated to realize intermittent aeration according to the COD concentration of the inflow water, and when the COD of the inflow water is more than or equal to 500mg/L, the aeration interval time of the first aeration pipe is 0.5-1.0 h; when the COD of the inflow water is 200-500 mg/L, the aeration stopping interval time of the first aeration pipe is 1.0-1.5 h; when the COD of the inflow water is 100-200 mg/L, the aeration stopping interval time of the first aeration pipe is 1.5-2 h; when COD of the inflow water is less than 100mg/L, the aeration stopping interval time of the first aeration pipe is 2-2.5 h;
s3, the falling biological film enters a mud passing channel through a first interception screen and the bottom of a water outlet area, a jet aerator is started to accelerate the movement of sludge at the bottom of the water outlet end of a precipitation area and in the mud passing channel to the bottom of a first mud collecting hopper in the precipitation area, the jet aerator is operated intermittently, the aeration flow is consistent with that of a first aeration pipe, the operation time is controlled according to the intermittent aeration time of the first aeration pipe, when the aeration stop time of the first aeration pipe is 0.5-1.0 h, and the operation time of the jet aerator is 5min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 1.0-1.5 h, the running time of the jet aerator is 3min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 1.5-2 h, the running time of the jet aerator is 2min before the first aeration pipe resumes aeration; when the aeration stopping interval time of the first aeration pipe is 2-2.5 h, the running time of the jet aerator is 1min before the first aeration pipe resumes aeration.
2. The method for operating a flocculation sedimentation tank reinforced ammonia nitrogen treatment MBBR system according to claim 1, wherein the method comprises the following steps: the flocculation reaction zone is communicated with the sedimentation zone through a water distribution wall.
3. The method for operating a flocculation sedimentation tank reinforced ammonia nitrogen treatment MBBR system according to claim 1, wherein the method comprises the following steps: the upper part of the water outlet end of the sedimentation zone is provided with a water outlet weir, the upper edge of the water outlet weir is lower than the running water level, and water outlet enters the aeration reaction zone through the water outlet weir.
4. The method for operating a flocculation sedimentation tank reinforced ammonia nitrogen treatment MBBR system according to claim 3, wherein the method comprises the following steps: the upper end of the guide wall is higher than the liquid level in the system, the vertical distance between the lower end of the guide wall and the bottom of the water outlet area is 1.0-1.5 m, a mud passing baffle is arranged between the mud passing channel and the sedimentation area, the upper part of the mud passing baffle is connected with the front end of the first interception screen, the lower part of the mud passing baffle extends towards the sedimentation area, the mud passing baffle forms an included angle of 45-60 degrees with the vertical direction, and the horizontal length of the mud passing baffle is smaller than that of the water outlet weir.
5. The method for operating a flocculation sedimentation tank reinforced ammonia nitrogen treatment MBBR system, according to claim 4, is characterized in that: the jet aeration baffle plate positioned right below the front tank wall of the aeration reaction zone is connected to the position 80% -90% of the length of the first interception screen, the jet aeration baffle plate positioned right below the front tank wall of the aeration reaction zone is parallel to the mud passing baffle plate, and the vertical distance between the jet aerator positioned in the water outlet zone and the jet aeration baffle plate corresponding to the jet aerator is kept the same as the vertical distance between the jet aerator positioned in the aeration reaction zone and the jet aeration baffle plate corresponding to the jet aerator.
6. The method for operating a flocculation sedimentation tank reinforced ammonia nitrogen treatment MBBR system according to claim 1, wherein the method comprises the following steps: the minimum height of the mud passing channel is not lower than 0.5m.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU931719A1 (en) * 1977-11-02 1982-05-30 Ордена Трудового Красного Знамени Институт Химии Древесины Ан Латвсср Apparatus for biochemically purifying effluents
KR20090027077A (en) * 2007-09-11 2009-03-16 주식회사 에코다임 Horizontal sedimentation system
CN106110717A (en) * 2016-08-10 2016-11-16 云南驰宏锌锗股份有限公司 A kind of ore dressing water treatment system with regulation and impurity sedimentation concentration one
CN108585385A (en) * 2018-06-29 2018-09-28 青岛思普润水处理股份有限公司 A kind of MBBR sewage disposal systems and treatment process
CN214400158U (en) * 2020-12-22 2021-10-15 青岛思普润水处理股份有限公司 Flocculation and precipitation pond intensification ammonia nitrogen treatment MBBR system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU931719A1 (en) * 1977-11-02 1982-05-30 Ордена Трудового Красного Знамени Институт Химии Древесины Ан Латвсср Apparatus for biochemically purifying effluents
KR20090027077A (en) * 2007-09-11 2009-03-16 주식회사 에코다임 Horizontal sedimentation system
CN106110717A (en) * 2016-08-10 2016-11-16 云南驰宏锌锗股份有限公司 A kind of ore dressing water treatment system with regulation and impurity sedimentation concentration one
CN108585385A (en) * 2018-06-29 2018-09-28 青岛思普润水处理股份有限公司 A kind of MBBR sewage disposal systems and treatment process
CN214400158U (en) * 2020-12-22 2021-10-15 青岛思普润水处理股份有限公司 Flocculation and precipitation pond intensification ammonia nitrogen treatment MBBR system

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