CN205258127U - Circulating flow ring type multi-section mud-film symbiotic combined bioreactor - Google Patents

Abstract

The utility model relates to a circulation flow loop type multistage mud membrane intergrowth combined type bioreactor, the reactor includes that the oxygen deficiency is good for supporting district, the settling zone more than anaerobic zone, two-stage, the oxygen deficiency is good for supporting district including the anoxic zone and the aerobic zone of establishhing in proper order, be equipped with the suspension filler district in the aerobic zone, the anaerobic zone is provided with sewage injection mouth and mud injection mouth, the anoxic zone is provided with the sewage injection mouth, the settling zone is provided with sewage flow outlet and sludge discharge mouth, the mud discharge mouth passes through backward flow mud pipe connection the mud injection mouth in anaerobic zone. The circulating flow annular multi-section mud-film symbiotic combined bioreactor can effectively realize high-efficiency nitrogen and phosphorus removal, control the tank volume, reduce the occupied area, reduce the construction cost and reduce the operating cost through the optimized combination of the reactors.

Description

A circulating flow ring type multi-stage mud film symbiotic composite bioreactor

technical field

The utility model relates to a circulating flow ring type multi-segment mud film symbiotic composite bioreactor, which belongs to the field of sewage treatment.

Background technique

The latest "Water Pollution Prevention and Control Action Plan" released in April 2015 clearly stated that the existing urban sewage treatment facilities should be transformed according to local conditions, and the corresponding discharge standards or recycling requirements should be met by the end of 2020. Urban sewage treatment facilities in sensitive areas (key lakes, key reservoirs, and nearshore water catchment areas) should fully meet the first-class A discharge standard by the end of 2017, and cities where the water quality of the built-up area does not meet the surface water level IV standard should build new towns Sewage treatment facilities must implement Class I A discharge standards; by 2030, strive to improve the overall quality of the national water environment and initially restore the functions of the water ecosystem. By the middle of this century, the quality of the ecological environment will be improved in an all-round way, and the ecological system will realize a virtuous cycle. It can be seen that the requirements for energy conservation and emission reduction will become higher and higher in the next few decades.

On the one hand, for the current situation that many sewage treatment plants are still designed and operated according to the first-level B standard of pollutant discharge standards, with the deepening of national energy conservation and emission reduction work, it is imperative to upgrade and optimize the operation of sewage treatment plants . In the upgrading of sewage treatment, expanding the pool capacity or increasing the advanced treatment unit is the most conventional and reliable solution, but many sewage treatment plants do not have sufficient site to build new sewage treatment units, and my country's strict farmland protection policy does not allow sewage treatment Therefore, it is urgent to seek an upgrade plan with a small footprint and high processing capacity. At present, there are mainly biological aerated filters, contact oxidation, and membrane bioreactors, but these processes still have high investment and energy consumption. Therefore, it is necessary to develop high-efficiency, low-cost and low-cost sewage treatment upgrading and upgrading technologies.

On the other hand, the rapid development of the city has gradually merged the sewage treatment plants that were far away from the urban area into the urban area, and the available land is limited in the process of renovation or new construction. Therefore, it is increasingly urgent to find a technology that can effectively control the pool capacity with low investment.

The purpose of this technology is to focus on breakthroughs in upgrading or upgrading technology for new sewage treatment plants, and to complete the stable and standard discharge of wastewater.

Multi-stage AO: The multi-stage AO process designs the biological reaction tank as the front-end anaerobic zone/aerobic + multi-level anoxic/aerobic zone, and adopts multi-point water distribution technology to distribute the sewage into the anaerobic zone and each anoxic zone in multiple stages. The front end of the anaerobic zone, while the return sludge all flows back to the front end of the anaerobic zone, creating a more suitable environment for the growth and reproduction of phosphorus accumulating bacteria, nitrifying bacteria and denitrifying bacteria, and greatly enhancing the ability of phosphorus and nitrogen removal.

IFAS: The IFAS process is a process that combines the biofilm method of attached growth and the activated sludge method of suspended growth (the principle is shown in the figure below). The biofilm and suspended activated sludge jointly remove pollutants in water, and because of the cutting effect of suspended filler on air bubbles, it can improve the oxygen transfer efficiency in water and enhance the treatment effect.

In addition, the IFAS process suspends the filler in the reactor through aeration disturbance, liquid reflux, etc., because the biomass fixed on the filler does not increase the mixed solution concentration of the activated sludge, and the growth of the biofilm will reduce the SVI of the system. Therefore, the performance of the downstream sedimentation tank will not be negatively affected by the increased solids load in the activated sludge reactor, but its performance will be improved to a certain extent.

The utility model fully combines the advantages of multi-stage AO and IFAS reactors (IFAS occupies a small area, increases the concentration of the activated sludge mixture, reduces the amount of sludge, and can improve the sedimentation performance of the sludge without increasing the load of the secondary settling tank and buffering capacity. Strong and multi-stage AO sludge with high concentration, full use of carbon source, high denitrification efficiency, strong impact load resistance, low operating cost, low engineering investment, etc.), biochemical treatment of sewage from sewage treatment plants to achieve optimal effluent water quality.

Utility model content

The purpose of this utility model is to overcome the shortcomings of the prior art and provide a circulating flow ring type multi-stage mud film symbiotic composite bioreactor. Through the optimized combination of reactors, it can effectively achieve efficient nitrogen and phosphorus removal, control tank capacity, Reduce floor area, reduce engineering cost and reduce operating costs.

The utility model is achieved through the following technical solutions:

A circulating flow ring type multi-stage mud film symbiosis composite bioreactor, including anaerobic zone, anoxic and aerobic supporting zone with more than two levels, and sedimentation zone set up in sequence, the anoxic and aerobic supporting zone includes anoxic and aerobic supporting zone set up in sequence An oxygen area and an aerobic area, a partition wall is provided between two adjacent areas, a water hole is provided at one end of the partition wall, a suspended packing area is provided in the aerobic area, and a sewage water tank is provided in the anaerobic area. Injection port and sludge injection port, the anoxic area is provided with a sewage injection port, the sedimentation area is provided with a sewage outflow port and a sludge discharge port, and the sludge discharge port is connected to the anaerobic The sludge injection port of the area.

Preferably, the anaerobic zone is provided with a diversion partition wall, and the anaerobic zone is divided into an anaerobic zone A and an anaerobic zone B through the diversion partition wall; two ends of the diversion partition wall are provided with two a diversion hole.

Preferably, the anoxic zone is provided with a diversion partition wall, and the anoxic zone is divided into an anoxic zone A and an anoxic zone B through the diversion partition wall; There are two diversion holes.

Preferably, the aerobic zone is provided with a diversion partition wall, and the aerobic zone is divided into an aerobic zone A and an aerobic zone B through the diversion partition wall; two ends of the diversion partition wall are provided with two a diversion hole.

Preferably, the suspended packing area includes suspended packing and a suspended packing retaining device.

Preferably, the anaerobic zone and the anoxic zone are provided with submersible mixers. More preferably, the submersible mixer in the anaerobic zone is a stirring type; the submersible mixer in the anoxic zone is a plug-flow type.

Preferably, the aerobic zone is equipped with a submersible mixer, which is set when the aeration intensity is low or when the fluidization state of the mixed sludge and filler is poor. More optimally, the submersible mixer in the aerobic zone is a plug-flow type.

Preferably, the anoxic zone and the aerobic zone are provided with an aeration system. More preferably, the aeration system in the anoxic zone and the aerobic zone is composed of a disc aerator with a diameter of D260 (200-300), and a single maximum ventilation rate of 4m ³ /h (2.3-5.9); The aerator includes a bracket, made of ABS, with double-sided buckles.

The circulating flow ring type multi-stage mud film symbiotic composite bioreactor of the utility model has the following beneficial effects:

(1) The operation mode is flexible, and the efficiency of nitrogen and phosphorus removal is high. The multi-point water inlet method can make the pollutants distributed in multiple stages, and each reaction zone can form an obvious sludge concentration gradient according to the characteristics of the pollutants, and the operation mode is flexible; through the segmentation of the reaction zone, it is suitable for all kinds of microorganisms in the activated sludge. The growth environment realizes efficient denitrification and phosphorus removal; an air system is installed in the anoxic zone next to the aerobic zone, which can be restored to the conventional A ² O process operation according to the water quality;

(2) The hydraulic flow state is "zonal circulation mixing, overall pushing flow", and the mixing reaction effect is ideal. The reactors in each zone adopt the flow state of circulating flow, and at the same time have the shock load resistance capacity of a fully mixed reactor and the matrix degradation driving force of a plug-flow reactor; Rapid flow, eddy current, short flow, stagnant water and mud accumulation are not easy to occur inside, the water head loss is small, the degree of uniformity of macroscopic mixing is high, and the effect of mixing reaction is ideal;

(3) Strong impact resistance. First of all, the pollution sources can be reasonably distributed through multi-point water intake to ensure a relatively suitable sludge load in each reaction zone; secondly, when the biofilm on the suspended filler ages and falls off into the mixed solution, it can inoculate the activated sludge , so that the anti-shock load capacity of the reaction pool can be improved; finally, the organic combination of various mixing methods can also improve the system's ability to handle different sewage water quality;

(4) The sludge settling performance is enhanced, and the excess sludge production is reduced. Suspended filler can effectively increase the sludge concentration in the reaction tank, and the increased microbial biomass is fixed on the filler carrier, which not only does not increase the mixed solution concentration of activated sludge and the solid load of the downstream sedimentation tank, but also reduces SVI and improves sludge settlement Performance; at the same time, due to the high concentration of suspended filler sludge, the sludge age increases, and the corresponding residual sludge production will decrease;

(5) Low project investment. The biomass of the suspended packing layer enables the biochemical treatment of pollutants to be completed in a smaller space, greatly reducing the pool volume of the reaction tank (about 45%), and the engineering investment is low (about 15%);

(6) Low energy consumption in operation. First of all, nitrification and denitrification are carried out by using multi-point water inflow, multi-stage anoxic and aerobic, optimizing carbon source distribution and strengthening denitrification, while canceling the nitrifying liquid return facility of traditional technology, and reducing operating energy consumption; secondly, using microporous aeration Equipment, power consumption is much lower than the commonly used perforated or mesopore aeration system, combined with the hydraulic form of circulating flow, can solve the contradiction between oxygenation and stirring, which is conducive to the recovery and utilization of dissolved oxygen at the end of the reaction tank, energy utilization Thirdly, combined with push flow, the bioflocculation in the reactor adopts lower driving force, which can save energy consumption;

(7) The pipeline system is less, and the amount of maintenance and repair is small. Through the design of the internal channel stacked structure, the water inlet and return sludge pipeline systems are omitted, and the amount of maintenance and repair is small.

Description of drawings

Fig. 1 is a process flow chart of a circulating flow ring type multi-stage mud film symbiosis composite bioreactor sewage treatment process;

Fig. 2 is a schematic diagram of a top view structure of a square circulating flow ring type multi-stage mud film symbiotic compound bioreactor.

Description of drawings:

1-anaerobic zone; 1a-anaerobic zone A; 1b-anaerobic zone B;

2-first-level hypoxic zone; 2a-first-level hypoxic zone A; 2b-first-level hypoxic zone B;

3-first-level aerobic zone; 3a-first-level aerobic zone A; 3b-first-level aerobic zone B; (including suspended packing zone);

4-Second-level hypoxic zone; 4a-Second-level hypoxic zone A; 4b-Second-level hypoxic zone B;

5-second-level aerobic zone; 5a-second-level aerobic zone A; 5b-second-level aerobic zone B; (including suspended filler zone);

6-sedimentation area; 6a-sewage outlet of the sedimentation area; 6b-sludge discharge port of the sedimentation area;

7-sewage injection port; 7a-sewage injection port in anaerobic zone; 7b-sewage injection port in first-level anoxic zone; 7c-sewage injection port in second-level anoxic zone;

8-return sludge channel; 8a-sludge injection port in anaerobic zone;

9-Diversion partition wall between anaerobic zone A and anaerobic zone B; 10-Partition wall between anaerobic zone and first-level anoxic zone; 11-First-level anoxic zone A and first-level anoxic zone Diversion partition wall between B; 12-partition wall between the first-level anoxic zone and the first-level aerobic zone; 13-diversion partition wall between the first-level aerobic zone A and the first-level aerobic zone B ; 14-the partition wall between the first-level aerobic zone and the second-level anoxic zone; 15-the diversion wall between the second-level anoxic zone A and the second-level anoxic zone B; 16-the second-level hypoxic zone The partition wall between the oxygen zone and the second-level aerobic zone; 17-the diversion wall between the second-level aerobic zone A and the second-level aerobic zone B; 18-the separation between the second-level aerobic zone and the precipitation zone wall;

19&20- the diversion hole in the anaerobic zone; 21- the water hole from the anaerobic zone to the first level anoxic zone; 22&23- the diversion hole in the first level anoxic zone; 24- the first level anoxic zone to the second level Water holes in the first-level aerobic zone; 25&26-drainage holes in the first-level aerobic zone; 27-water-through holes from the first-level aerobic zone to the second-level anoxic zone; 28&29-second-level anoxic zone 30- the water passage hole from the second-level anoxic zone to the second-level aerobic zone; 31&32- the diversion hole from the second-level aerobic zone; 33- the second-level aerobic zone to the precipitation zone the diversion hole;

34-suspended filler; 35-suspended filler retaining device; 36-submersible mixer (submersible propeller).

detailed description

The sewage treatment process flow chart of the circulating flow ring type multi-stage mud film symbiosis composite bioreactor of the utility model is shown in Figure 1. Combining the advantages of the two processes of multi-stage AO and IFAS, the sewage of the sewage treatment plant is biochemically treated. To achieve better effluent quality.

A kind of sewage treatment process utilizing the circulating flow ring type multi-stage mud film symbiosis composite bioreactor shown in Fig. 2, comprises the following steps:

(A) sewage enters described reactor through two parts, and first part enters anaerobic zone through the sewage inlet of anaerobic zone, and second part enters anoxic zone at all levels respectively through the sewage inlet of anoxic zone at all levels;

(B) The sewage from the sewage inlet in the anaerobic zone is mixed with the return sludge from the sedimentation zone. The phosphorus accumulating bacteria in the anaerobic zone release phosphorus in an anaerobic environment, and at the same time transform easily degradable organic pollutants, and partly Ammonification of nitrogen-containing organic matter;

(C) Then enter the anoxic and aerobic supporting areas above two levels, denitrification and denitrification are carried out in the anoxic areas at all levels, and some organic matter is degraded and removed under the action of denitrifying bacteria; suspended filler areas are set in the aerobic areas at all levels , for further degradation of organic matter and ammonification and nitrification of organic nitrogen and absorption of phosphorus;

(D) The effluent from the last stage of aerobic zone is discharged to the sedimentation zone, and the purified water is discharged through the separation of mud and water. Part of the concentrated sludge is returned to the anaerobic zone, and the other part is discharged to the sludge concentration and dehydration system.

The anaerobic zone includes anaerobic zone A and anaerobic zone B; the sewage first enters the anaerobic zone A, flows under the stirring action of the submersible mixer provided in the anaerobic zone A, and then enters the anaerobic zone B, It flows under the agitation of the submersible mixer set in the anaerobic zone B; then part of it circulates into the anaerobic zone A, and part of it enters the first-stage anoxic zone.

The anoxic areas at all levels include anoxic area A and anoxic area B; the sewage flows under the agitation of the submersible mixer installed in anoxic area A, and then enters anoxic area B. The flow is driven by the agitation of the submersible mixer, and then part of it circulates into the anoxic zone A, and part of it enters the aerobic zone.

Aerobic zones at all levels include aerobic zone A and aerobic zone B; aerobic zone A and aerobic zone B are equipped with suspended filler zones; sewage first enters aerobic zone A, then enters aerobic zone B, and part of it is recycled to the aerobic zone In the oxygen zone A, part of it enters the anoxic zone or the precipitation zone.

The technical scheme of the utility model is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude that there are other method steps before and after the combination steps or other method steps can be inserted between these explicitly mentioned steps; it should also be understood that, These examples are only used to illustrate the utility model and not to limit the scope of the utility model. And, unless otherwise stated, the numbering of each method step is only a convenient tool for identifying each method step, rather than limiting the sequence of each method step or limiting the scope of the utility model, the change or adjustment of its relative relationship, In the case of no substantial change in the technical content, it should also be regarded as the scope of the utility model that can be implemented.

The utility model will be further described below in conjunction with accompanying drawings and specific examples of implementation.

Example 1

As shown in Figure 2, a circulating flow ring type multi-stage mud film symbiotic composite bioreactor (CCMAO-IFAS) (square), including anaerobic zone 1, first-stage anoxic zone 2, first-stage aerobic zone Zone 3, the second-level anoxic zone 4, the second-level aerobic zone 5 and the sedimentation zone 6, the anaerobic zone is provided with a sewage injection port 7a and a sludge injection port 8a, and the first-stage anoxic zone 2 is provided with a first The first-level anoxic zone sewage inlet 7b, the second-level anoxic zone 4 is provided with the second-level anoxic zone sewage inlet 7c, the sedimentation zone 6 is provided with the sedimentation zone sewage outflow port 6a and the sedimentation zone sludge discharge outlet 6b, and the sedimentation zone The sludge discharge port 6b in the zone is connected to the sludge injection port 8a in the anaerobic zone through the return sludge channel 8; the reactor is square; the water inlet channel 7 is respectively provided with an inlet weir and a control gate to distribute the sewage to the anaerobic zone 1, The first-level anoxic zone 2 and the second-level anoxic zone 4; the anaerobic zone 1 includes the anaerobic zone A1a and the anaerobic zone B1b, and the anaerobic zone A1a and the anaerobic zone B1b are separated by a diversion partition wall 9 for diversion The two ends of the partition wall 9 are provided with diversion holes 19 & 20, and the water flow is connected through the diversion holes 19 & 20, and a submersible mixer 36 is arranged inside to stir and push; the anaerobic zone 1 and the first-stage anoxic zone 2 are separated by the partition wall 10, and the partition One end of the wall 10 is provided with a water hole 21, and the sewage in the anaerobic zone 1 communicates with the first-level anoxic zone 2 through the water hole 21; the first-level anoxic zone 2 includes the first-level anoxic zone A2a and the first-level The anoxic zone B2b, the first-level anoxic zone A2a and the first-level anoxic zone B2b are separated by a diversion partition wall 11. Diversion holes 22&23 are arranged at both ends of the diversion partition wall 11, and water flows through the diversion holes 22&23 Connected, submersible mixer 36 is installed inside to stir and push and microporous aeration equipment; the first-level anoxic zone 2 and the first-level aerobic zone 3 are separated by a partition wall 12, and one end of the partition wall 12 is provided with a water hole 24, The first-level anoxic zone 2 communicates with the first-level aerobic zone 3 through the water hole 24; the first-level aerobic zone 3 includes the first-level aerobic zone A3a and the first-level aerobic zone B3b, and the first-level good The oxygen zone A3a and the first-stage aerobic zone B3b are separated by a diversion partition wall 13. The two ends of the diversion partition wall 13 are provided with diversion holes 25 & 26, and the water flow is communicated through the diversion holes 25 & 26, while surrounding the diversion partition wall 13 Circulating flow; the first-stage aerobic zone 3 is provided with a suspended packing area and microporous aeration equipment. The suspended packing area includes a suspended packing 34 and a suspended packing retaining device 35. The suspended packing 34 is fixed in a designated area through the suspended packing retaining device 35 ; The first level aerobic zone 3 and the second level anoxic zone 4 are separated by a partition wall 14, and one end of the partition wall 14 is provided with a water hole 27, and the first level aerobic zone 3 sewage passes through the water hole 27 and the second The first-level anoxic zone 4 is connected; the second-level anoxic zone 4 includes the second-level anoxic zone A4a and the second-level anoxic zone B4b, and the second-level anoxic zone A4a and the second-level anoxic zone B4b pass through the diversion compartment Separated by wall 15, the two ends of diversion partition wall 15 are provided with diversion holes 28 & 29, and the water flow is connected through diversion holes 28 & 29, and submersible mixer 36 is installed inside to stir and push and microporous aeration equipment; the second stage anoxic zone 4 and the second level aerobic zone 5 through the partition wall 16 Separation, one end of the partition wall 16 is provided with a water hole 30, and the sewage in the second-level anoxic zone 4 communicates with the second-level aerobic zone 5 through the water hole 30; the second-level aerobic zone 5 includes the second-level aerobic zone Zone A5a and the second-level aerobic zone B5b, the second-level aerobic zone A5a and the second-level aerobic zone B5b are separated by a diversion partition wall 17, and the two ends of the diversion partition wall 17 are provided with diversion holes 31 & 32, and the water flow It is connected through the diversion holes 31 & 32, and circulates around the diversion partition wall 17 at the same time; the second-stage aerobic zone 5 is provided with a suspended packing area and microporous aeration equipment, and the suspended packing area includes suspended packing 34 and suspended packing retaining device 35, the suspended filler 34 is fixed in the designated area by the suspended filler retaining device 35; the second-stage aerobic zone 5 and the sedimentation zone 6 are separated by a partition wall 18, and one end of the partition wall 18 is provided with a water hole 33, and the second-stage aerobic zone The sewage in zone 5 is connected to the sedimentation zone 6 through the water hole 33; the concentrated sludge in the sedimentation zone 6 flows back to the anaerobic zone 1 through the return sludge channel 8, and the control gate is set in the return sludge channel 8.

40,000m ³ /d of urban sewage is treated by using the circulating flow ring type multi-stage mud film symbiosis composite bioreactor (CCMAO-IFAS) (square type) as shown in Figure 1. The treatment process includes the following steps:

(1) Sewage enters the reactor through two parts. The first part enters the anaerobic zone 1 through the sewage inlet 7a of the anaerobic zone, and the second part passes through the sewage inlet 7b of the first-level anoxic zone and the second-level anoxic zone in proportion. District sewage injection port 7c enters the first-level anoxic zone 2 and the second-level anoxic zone 4 respectively; the water flow ratio of entering the first-level anoxic zone and entering the second-level anoxic zone is 2:3.

(2) The sewage from the sewage inlet 7a in the anaerobic zone is mixed with the return sludge from the sedimentation zone, firstly enters the anaerobic zone A1a, flows under the agitation of the submersible mixer set in the anaerobic zone A1a, and then enters In the anaerobic zone B, it flows under the agitation of the submersible mixer set in the anaerobic zone B; then part of it circulates into the anaerobic zone A, and a part enters the first-level anoxic zone, and the phosphorus accumulating bacteria in the anaerobic zone Release phosphorus in an anaerobic environment, simultaneously transform easily degradable organic pollutants, and ammoniate some nitrogen-containing organic substances;

(3) Then enter the two-level anoxic and aerobic supporting area, each level of anoxic and aerobic supporting area includes anoxic area and aerobic area, and the anoxic area at all levels includes anoxic area A and anoxic area B; It flows under the stirring action of the submersible mixer set in the oxygen zone A, then enters the anoxic zone B, flows under the stirring action of the submersible mixer set in the anoxic zone B, and then partly circulates into the anoxic zone A , part of it enters the aerobic zone. Aerobic zones at all levels include aerobic zone A and aerobic zone B; aerobic zone A and/or aerobic zone B is provided with a suspended filler zone; sewage first enters aerobic zone A, then enters aerobic zone B, and part of the circulation In the aerobic zone A, part of it enters the anoxic zone or sedimentation zone, denitrification and denitrification are carried out in the anoxic zones at all levels, and some organic matter is degraded and removed under the action of denitrifying bacteria; suspended fillers are set in the aerobic zones at all levels Area, for further degradation of organic matter, ammonification and nitrification of organic nitrogen and absorption of phosphorus;

(4) The effluent from the last stage of aerobic zone is discharged to the sedimentation zone, and the purified water is discharged through the separation of mud and water. Part of the concentrated sludge is returned to the anaerobic zone, and the other part is discharged to the sludge concentration and dehydration system.

34 The filling ratio of suspended filler is 35%; 14 The material of suspended filler is polyethylene, the particle size is 25mm, the bulk specific gravity is 0.96±2g/cm ³ , and the specific surface area is >500m ² /m ³ ; 35 The suspended filler retention device is composed of stainless steel porous retention net , The diameter of the round hole of the retention net is 8mm, the center distance of the round hole is 10mm, and a row of coarse air diffusers are installed at the bases on both sides of the retention net. The submersible mixer in anaerobic zone is stirring type; the submersible mixer in anoxic zone and aerobic zone is plug flow type. The aeration system in the anoxic zone and the aerobic zone is composed of a disc aerator with a diameter of D250 and a single maximum ventilation volume of 4m ³ /h; the aerator includes a bracket made of ABS with double-sided buckles.

The sludge reflux ratio in the reaction zone is 100% (the actual operation is 50-100%); the average sludge concentration in the reaction zone is 8360mg/L (actually 7000-12000mg/L); the stirring intensity in the anaerobic zone is 5W/m ³ , equipped with 4 mixers, Single power 2.2kW; agitation intensity in anoxic zone 2.5W/m ³ , equipped with 8 mixers, single power 1.1kW; aeration intensity in aerobic zone 8～10m ³ /m ² .h, arrange microporous aeration pan 2500, 10-20% of the aerators in the aerobic zone are reserved in the anoxic zone 2 (restored to the conventional A ² O process state, this zone operates as aerobic).

The hydraulic retention time in the anaerobic zone is 1h; the hydraulic retention time in the anoxic zone is 2.3h; the hydraulic retention time in the aerobic zone is 3.8h. The range of denitrification load in anoxic zone is 0.03kgNO ₃ -N/kgMLSS.d (the actual operation is 0.03～0.05kgNO ₃ -N/kgMLSS.d); the value of sludge load is 0.108kgBOD ₅ /(kgMLSS.d ) (actual operation 0.05～0.15kgBOD ₅ /(kgMLSS.d)).

Structural dimensions of the reactor (except for the sedimentation area): L×B×H=50×40×7m (effective water depth 6m) (1 seat in total, divided into two groups for operation).

Implementation Effect:

Design water quality:

COD _Cr : 330mg/L; BOD ₅ : 150mg/L; TN: 40mg/L; NH ₃ -N: 35mg/L; SS: 300mg/L; TP: 5mg/L;

After being treated by the circulating flow ring type multi-stage mud film symbiotic composite bioreactor of the utility model, the main effluent quality can reach below the first-class A standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002).

Operating energy consumption: 0.19～0.21kW.h/m ³ .

It should be pointed out that those skilled in the art who can make use of the technical content disclosed above and make some changes, modifications and equivalent changes without departing from the spirit and scope of the present utility model are all It is an equivalent embodiment of the utility model; at the same time, any change, modification and evolution of any equivalent changes made to the above-mentioned embodiments according to the substantive technology of the utility model still belong to the scope of the technical solution of the utility model.

Claims (8)

1. A circulating flow ring type multi-section mud film symbiotic composite bioreactor is characterized in that it comprises an anaerobic zone set up successively, an anoxic aerobic supporting area and a sedimentation area above two levels, and the anoxic aerobic supporting area The area includes an anoxic area and an aerobic area set up in sequence, and a partition wall is provided between two adjacent areas, and a water hole is provided at one end of the partition wall, and a suspended packing area is provided in the aerobic area. The anaerobic zone is provided with a sewage inlet and a sludge inlet, the anoxic zone is provided with a sewage inlet, the sedimentation zone is provided with a sewage outlet and a sludge outlet, and the sludge outlet passes through the return sludge A channel connects the sludge injection port of the anaerobic zone. 2. circulating flow ring type multi-section mud film symbiosis composite bioreactor as claimed in claim 1, is characterized in that, described anaerobic zone is provided with diversion partition wall, by described diversion partition wall the anaerobic region It is divided into anaerobic zone A and anaerobic zone B; two diversion holes are arranged at both ends of the diversion partition wall. 3. The circulating flow ring type multi-section mud film symbiosis composite bioreactor as claimed in claim 1, wherein, the anoxic zone is provided with a diversion partition wall, and the deficient gas is separated by the diversion partition wall. The oxygen zone is divided into anoxic zone A and anoxic zone B; two diversion holes are arranged at both ends of the diversion partition wall. 4. circulating flow ring type multi-section mud film symbiotic composite bioreactor as claimed in claim 1, is characterized in that, described aerobic zone is provided with diversion partition wall, aerobic region is separated by described diversion partition wall It is divided into an aerobic zone A and an aerobic zone B; two diversion holes are arranged at both ends of the diversion partition wall. 5 . The circulating flow ring type multi-stage mud film symbiosis composite bioreactor according to claim 1 , wherein the suspended packing area comprises suspended packing and a suspended packing retaining device. 6 . 6. The circulating flow ring type multi-stage mud film symbiosis composite bioreactor according to claim 1, characterized in that, the anaerobic zone and the anoxic zone are provided with submersible mixers. 7. The circulating flow ring type multi-stage mud film symbiotic composite bioreactor according to claim 6, wherein the submersible mixer in the anaerobic zone is a stirring type; the submersible mixer in the anoxic zone is a plug flow type. 8. The circulating flow ring type multi-stage mud film symbiosis composite bioreactor according to claim 1, characterized in that, the anoxic zone and the aerobic zone are provided with an aeration system.