CN209602306U - A kind of " main-auxiliary " activated Sludge System coupling deodorization and intensified denitrification and dephosphorization - Google Patents

Abstract

The utility model relates to a kind of coupling deodorization and " main-auxiliary " activated Sludge Systems of intensified denitrification and dephosphorization, main line uses traditional activated sludge and its deformation technique, it is the effluent sludge organism culture pond (S2HBR) and effluent activated sludge anaerobic fixed film reactor (S2ASH) reactor for being filled with bacteria culture tank (SBIO-A) provided with sludge Microtraps filter, inside in activity sludge reflux line on " auxiliary " line；The pond subordinate line reaction tank S2HBR and S2ASH can be in parallel or in series.The utility model can with orienting enriching, significantly improve and optimize the Bacterial community of activated sludge, " main-auxiliary " combination of reactors is to realize directive breeding specific microorganism by the effluent reactor on " auxiliary " line and further carry out functional microorganism inoculation to the main biochemical system on " main line ", " main-auxiliary " reactor configuration can realize the advanced nitrogen dephosphorization of biochemical system, and it is obviously improved the deodorizing effect of overall process, while saving business carbon source, realizing activated sludge situ process decrement.

Description

A "Main-Auxiliary" Activated Sludge System Coupled with Deodorization and Enhanced Nitrogen and Phosphorus Removal

technical field

The utility model belongs to the field of sewage treatment and water environment treatment, in particular to a "main-auxiliary" activated sludge system that couples the whole process of deodorization and strengthens the functions of nitrogen and phosphorus removal.

Background technique

At present, China's water environment problems are frequent, surface water eutrophication is serious, and the water quality of some water areas even loses the function of drinking water source. important long-term tasks. At the same time, due to historical reasons, many urban sewage plants are built in urban areas. The process of sewage collection and treatment releases a large amount of volatile odorous gases (such as hydrogen sulfide, ammonia, etc.), which seriously interferes and affects the ambient air quality of surrounding cities. The avoidance effect becomes more prominent. Stable water quality compliance and odor control are common problems faced by sewage plants today.

At the same time, many areas of our country suffer from severe shortage of carbon sources for sewage plants. Existing conventional treatment processes, such as deformation processes of various activated sludge methods, AAO and its variant processes, oxidation ditch, MBR, SBR and Its various variant processes mainly rely on the traditional phosphorus removal bacteria Accumulibacter to achieve EBPR (Enhanced Biological Phosphorus Removal), while Accumulibacter can only rely on the ingestion of VFA in the influent, and there is also substrate competition between PAO and GAO; in addition, the reflux of nitrate and DO Interference with the anaerobic zone makes it difficult to control the ORP below -150mv in the anaerobic zone. It is not an ideal anaerobic environment for biological phosphorus removal. Many of the above factors lead to unstable biological phosphorus removal effects of traditional mainstream treatment processes. In addition, the high pollution load caused by the high ammonia nitrogen reflux of the sludge dewatering liquid in the sludge treatment section, the low water temperature season and other factors lead to insufficient nitrification capacity and the ammonia nitrogen in the effluent does not meet the standard. The above factors make it difficult for the traditional process to remove nitrogen and phosphorus. For further improvement, standard upgrading often has to choose to transform the original aeration tank into the IFAS process, or add a third-level biochemical treatment unit (such as BAF, deep-bed denitrification filter), which greatly increases the project investment. At the same time, it also increases the operating cost during the operation period, and the greenhouse gases released by the environment also increase exponentially with the prolongation of the process. The lengthy upgrading and transformation process is generally unsustainable.

After more than a hundred years of development, the activated sludge process is still the most economical and effective method for sewage treatment. However, the traditional mainstream activated sludge process is vulnerable to external disturbances (water quantity, water quality, and water temperature changes). From the perspective of the control of the bacterial flora structure, because the traditional mainstream activated sludge process only has the activated sludge process on the "main line", although anaerobic, anoxic and aerobic environments are set, the above environments are affected by various factors (influent water quality water fluctuations, internal backflow and external backflow), and the removal of different pollutants must be taken into account, but the ecological niches of different microorganisms are very different, so it is difficult to take into account the habitat conditions of different functional flora under the process control conditions, and it is difficult to realize the removal of active pollutants. It is more difficult to achieve directional transformation and control for the optimization and regulation of the structure of the mud flora.

In response to the above problems, the current technical route solutions often use "multiple methods" and "separate solutions". The process is becoming more and more complicated, but systematic and collaborative consideration is not achieved, and nutrients are often solved through the superposition of lengthy process routes. However, the deodorization problem is still not resolved, and it is still necessary to increase the deodorization measures along the whole process along with the extension of the sewage treatment process, resulting in high investment and operating costs for the deodorization system. Some deodorization technologies commonly used at present have been investigated. The collection method deodorization equipment and operating costs are high, and it needs to be covered to collect odors to form a closed space, which will cause great corrosion to the equipment; other types of existing biological deodorization technologies, such as rotting Soil deodorization or soil microbial deodorization technology, the microbial culture medium used is relatively single composition such as humus, or clay and cement cement, lime pressing, or other biofilm carriers such as volcanic rock, etc. fired or pressed The processing process of the above-mentioned matrix or carrier makes the matrix denatured and the biological activity of the components is unfriendly. The most important thing is that it is difficult to directional and stably cultivate deodorant microorganisms such as Bacillus, and even destroy the activity of microorganisms. Therefore, many deodorant microorganisms currently in operation in China Smelly project, the effect is unstable and extremely unsatisfactory.

In addition, some existing deodorization methods of activated sludge in the whole process, such as placing the culture tank in the main aeration tank, the operating MLSS is low (2500-4500mg/L), and the MLSS in the main aeration tank is low, which is not conducive to The enrichment of microorganisms in the culture tank; in addition, in order to strengthen the removal of pollutants such as COD, N, and P in the aeration tank, continuous aeration is often used, and DO is too high, and there is even excessive aeration, which is not conducive to the enrichment of deodorizing microorganisms It is also not conducive to sludge reduction because some deodorizing microorganisms prefer a facultative state, or an anaerobic/anoxic/aerobic alternating environment, which is more conducive to stimulating the biochemical activity of these special flora. In addition, the cultivation tank is in the main biological tank, and the activated sludge mixture in the main biological tank is mixed with impurities such as sand and fibers with a high content, which is very easy to block the filler layer of the tank.

The technical scheme disclosed in the document "Decontamination Efficiency and Deodorization Effect of Humic Soil Activated Sludge Technology (China Water and Drainage, 2007, 23 (14))" focuses on theoretical research, and only gives the humus soil activated sludge process. The introduction of the basic principles and general process characteristics, and in the process mentioned in the literature, the humus soil cultivation tank and the main aeration tank are jointly built, the return flow of the humus soil cultivation tank is only 3%-10%, and the cultivation tank is Continuous aeration, the composite catalytic filler in the culture tank does not embed functional bacteria, and the mixed solution with DO in the culture tank flows directly to the anaerobic section of the biological tank, which destroys the biological phosphorus release effect of the anaerobic tank. The problem has affected the unsatisfactory process effect of the actual project, and even the contradiction between deodorization and phosphorus removal. At the same time, since the return sludge contains more inorganic components such as sand and fiber impurities, these impurities will greatly reduce the microbial activity after entering the culture tank, block the culture tank, and even cause the culture tank to fail to operate normally. In addition, this kind of simple humus activated sludge deodorization soil microorganisms are slowly cultivated in the biochemical system, and it takes 2-6 months or even longer to start the deodorization effect slowly, which affects the operation and environmental protection of the sewage plant acceptance.

In the patent CN104150609B (a method for in-situ enrichment of nitrifying bacteria coupled with sludge hydrolysis to enhance denitrification and phosphorus removal), the S-NDN pool and the S-HY pool also use the side flow mode and use two sets of reactors with independent functions However, S-NDN focuses on strengthening the cultivation of nitrifying bacteria and denitrification, reducing the SRT of the main biological pool, and then improving the processing capacity under the short SRT operation of the biochemical system. ; while the S-HY pool mainly produces internal carbon source soluble COD (SCOD) and volatile fatty acids (VFAs) through the hydrolysis process to supplement the shortage of SCOD and VFAs in the influent, so the S-HY pool does not have too strict restrictions on ORP. Anaerobic environment, anoxic environment and even micro-aerobic aeration environment are all available. The process is controlled with the goal of the highest yield of activated sludge fermentation and hydrolysis. The purpose of the S-HY pool is not simply to pursue deep anaerobic conditions, nor to simply pursue Oriented cultivation of fermentative phosphorus-accumulating bacteria such as Tetrasphaera.

Therefore, in view of the deficiencies of the existing technology and the shortcomings in practical application, combined with the deep nitrogen and phosphorus removal of sewage treatment, the reduction of commercial carbon source dosage, the realization of the whole process of deodorization, sludge reduction and other actual diversified needs , to develop a sustainable sewage treatment process with fast start-up, more stable operation, high efficiency, directional cultivation and enrichment of microorganisms, coupled deodorization and enhanced nitrogen and phosphorus removal, high efficiency and low consumption, which will help improve the operation effect of the sewage treatment system , to improve the water environment and the surrounding air quality, especially to meet the technical needs of deep nitrogen and phosphorus removal in China's sewage plants, has important and far-reaching practical significance.

Utility model content

In view of this, the utility model aims to propose a "main-auxiliary" activated sludge bioaugmentation system that couples the whole process of deodorization and enhanced denitrification and phosphorus removal. The "main line" biochemical system consists of the main aeration tank and the secondary sedimentation Pool composition, the main reaction pool adopts traditional AAO, step-feed, oxidation ditch, multi-stage AO, Bardenpho and other activated sludge processes or one of its deformation processes, and the "auxiliary line" is equipped with independent functions and structures Two sets of side-flow activated sludge bioaugmentation reactors, namely "S2HBR-S2ASH" (S2HBR and S2HBR combined for short S2 pool), set up a cultivation tank in the S2HBR reactor, and set up two kinds of biological cultivation in the upper and lower layers of the tank. The base is designed to quickly start, inoculate, cultivate, and enrich the specific functional microbial flora with deodorization function, and place the culture tank in an independent side flow reactor. The side flow tank has a high concentration of MLSS total amount, through The "gas-liquid-solid" three-phase turbulence in the culture tank disturbs the local and microcirculation in the tank to realize the efficient mass transfer and exchange of the material and functional microorganisms in the tank and the sludge mixture in the side flow reaction tank; in the S2HBR side flow In the reaction tank, the aeration and agitation are controlled according to online instruments such as ORP, pH, NH3-N (alternate nitrification and denitrification processes), so as to realize the cultivation and enrichment of deodorizing bacteria and simultaneous efficient denitrification and phosphorus removal (alternative nitrification-denitrification ), and make the microorganism enter the endogenous respiration state to further stimulate the metabolic activity of the microorganism, the alternation of anoxic/aerobic realizes the uncoupling of the microbial metabolic process, effectively reduces the VSS yield, and realizes the purpose of sludge reduction; The role of S2ASH is to achieve a deep anaerobic environment (ORP≤-150mv) through the control of the return sludge concentration and agitation intensity (continuous or intermittent operation of the agitator), which can effectively cultivate Tetrasphaera-PAO-like phosphorus-accumulating bacteria and inhibit polysaccharides The growth of bacterial GAOs (the appearance of GAOs can worsen the effect of biological phosphorus removal) forms a "Tetrasphaera-Accumulibacter" double PAO synergistic symbiosis environment. Tetrasphaera-like phosphorus-accumulating bacteria do not rely on VFAs in the water, and they can directly use macromolecular organic substances such as glucose and amino acids. Perform anaerobic fermentation to release phosphorus, and at the same time, the VFAs formed by its fermentation products can be used as Accumulibacter substrates. Double PAOs can achieve high-efficiency symbiosis and synergistic enhancement of biological phosphorus removal. The activated sludge after the biochemical process of the "auxiliary line" S2 reactor flows out To the main biological pool and the water inlet of the sewage plant and the parts that need to be deodorized (such as sludge thickening tank, mud storage tank, etc.). The S2HBR-S2ASH combined reactor has independent structure and function, clear division of labor, and ecological synergy. According to the different ecological niches of different bacterial species, the most suitable habitats are constructed respectively, and functional bacteria are enriched and cultivated separately. Through the "main-auxiliary" reactor The configuration arrangement and function enhancement of functions realize the efficient inoculation, substrate transfer and efficient utilization from the "auxiliary line" reactor to the "main line" reactor. The combined system can be coupled to realize deodorization, enhanced nitrogen and phosphorus removal and sludge reduction , The functions of the "main-auxiliary" line reactors promote each other, and the operation of the "main-auxiliary" biochemical system is more efficient, stable, and resistant to impact loads.

The concrete technical scheme of the utility model is as follows:

The biochemical process of the system involved in the utility model includes at least four reactors, specifically: the main line includes at least the main biological reaction tank and the secondary sedimentation tank, and the auxiliary line sludge return line includes at least a strain cultivation tank. The sludge biological culture tank S2HBR of the tank SBIO-A and the activated sludge fermentation tank S2ASH, S2HBR and S2ASH are combined and referred to as the S2 pool; the main line and the radial line are connected through the return sludge pump room; S2HBR and S2ASH operate in series or in parallel.

Further, in order to improve the activity of the activated sludge in the side flow section, improve the MLVSS/MLSS ratio, and reduce the clogging of the cultivation tank by fibers and large particles of impurities, the utility model is equipped with a sludge micro-sieve filter in the return line, which can One or more sets, give priority to the removal of granular impurities in the return sludge, such as sand, hair and other fibrous impurities.

Under the above-mentioned series operation mode, the preferred steps are: part of the return sludge is filtered through a micro-sieve, and then sequentially passed through the S2 pool to inoculate, enrich the nitrifying bacteria, and deodorize the functional microorganisms. The outflow of the S2 biochemical pool can all be selected from the S2ASH outflow , or S2HBR, S2ASH pool outflow respectively in one of two forms:

The first way is that all the outflow of S2HBR enters S2ASH. After S2ASH is anaerobicly hydrolyzed and PAOs multiplied, part of the mixed solution enters the anaerobic or anoxic section of the main biological pool for enhanced biological phosphorus and nitrogen removal, and the other part enters the sewage plant for further processing. Water pipes achieve deodorization;

The second method is that a part of the S2HBR outflow is directly sent to the water inlet of the sewage plant for deodorization, and the remaining sludge enters the S2ASH pool, and this part of the sludge enters the main biological pool after S2ASH bioaugmentation and microbial proliferation.

Under the above-mentioned parallel operation mode, the preferred steps are: the S2HBR pool and the S2ASH pool use independent inflows, of which part of the outflow from the S2HBR pool goes to the water inlet pipe for deodorization, and the other part enters the anoxic section or aerobic section of the main biological pool for replenishment Nitrifying bacteria and other functional microorganisms, the effluent from the S2ASH pool directly enters the anaerobic section of the main biological pool for enhanced biological phosphorus removal.

A more preferred step is that, under the above-mentioned series or parallel operation mode, part of the return sludge is first passed through a micro-sieve to remove sand and fiber impurities before entering the S2 pool. The filtration precision of the micro-sieve is 150-1000 microns, and the preferred filtration precision is 200-600 microns.

In the above-mentioned "main-auxiliary" activated sludge system coupled with deodorization and enhanced denitrification and phosphorus removal, the total external return flow rate Q _RAS of the control sludge is (30%-100%)Q, and Q is the water inflow of the sewage plant, Q _RAS is the total amount of external return sludge; the optimal Q _RAS is (33%-50%)Q.

Among them, the amount of sludge returned to the S2HBR-S2ASH pool accounts for 6% to 30% of the QRAS; the remaining (70% to 94%) _QRAS return sludge is directly returned to the beginning of the biological pool through the return pump room.

S2 tank sludge return mode can choose one of the following two modes: series and parallel:

For the series mode, there are two specific methods, ①Method 1: The return sludge passes through S2HBR and S2ASH in sequence, and finally diverts from the S2ASH pool, and the outflow is divided into two destinations, and 1%-5% of the sludge is returned to the sewage plant influent The main pipe is used for deodorization, and 5%-29% Q _RAS enters the main biological pool for enhanced nitrogen and phosphorus removal; ②Method 2: divert from the S2HBR, the outflow is divided into two destinations, and 1%-5% of the sludge is returned to The water inlet main of the sewage plant is used for deodorization, and the remaining 5%-29% Q _RAS enters the S2ASH pool for bioaugmentation and then enters the main biological pool for enhanced nitrogen and phosphorus removal.

For the parallel mode, sludge return 6-30% Q _RAS is divided into two paths, of which 2%-26% Q _RAS enters the S2HBR pool, 4%-28% enters the S2ASH pool; 1%-5% Q _RAS outflow of the S2HBR pool Enter the water inlet pipe of the sewage plant or the thickening/sludge storage tank; the remaining 1%-25% Q _RAS and SAHS tank effluent enter the main biological tank together.

The optimization procedure is that, in the above two return methods in S2, the return sludge must be treated with micro-sieves in advance.

The optimal process parameters are: the total HRT of the S2HBR-S2ASH pool is 4-30h; the HRT of the S2HBR pool is 3-24h, the optimal 8-20h; The degradation rate of collection and pollutants is improved; the MLSS concentration of activated sludge is 6000-18000mg/L, and the high concentration of sludge in the side flow tank is conducive to the rapid enrichment of bacteria and improves the impact resistance of the system, but if it is too high, it will Insufficient aeration or stirring power, or problems such as floating mud. In general, the external reflux ratio RAS is controlled at a lower range of 33%-50%, which is conducive to the operation of the side stream reactor and the improvement of the enrichment efficiency of the bacterial population per unit tank volume.

Further, the S2HBR pool adopts "aerobic/anoxic" alternation to realize the cultivation and function enhancement of deodorizing bacteria, and at the same time realize the nitrification and endogenous denitrification of activated sludge; in addition, through anaerobic/anoxic/good Oxygen alternately stimulates the uncoupling of microorganisms, which can reduce the VSS of activated sludge by 10%-40%; S2HBR operation control adopts advanced mode or basic mode, and the advanced mode adopts N/DN intermittent aeration, and set DO/ORP , pH, NH3-N/NO3-N, PO4-P online instruments control the aerobic-anoxic or aerobic-anoxic-anaerobic process, and realize the nitrification and denitrification process of the return sludge; the basic mode adopts time series N /DN time control, aiming to realize the nitrification and denitrification denitrification process of returning sludge and stimulate the uncoupling of microorganisms to achieve sludge reduction.

Furthermore, the high point of the DO setting value of the S2HBR pool is 0.5-1.0mg/L, and the low value is 0-0.3mg/L; the high point of the NH3-N setting value is set at 1.2-3.0mg/L, and the low value 0.1-0.5mg/L, realize the switch control of aeration and stirring equipment according to the level of the set point.

Further, S2ASH controls the ON/OFF operation duration of the continuous or intermittent agitator or flowmaker, and controls the start/stop of the agitator through the control of the reflux ratio and the return sludge concentration, and the ORP signal. One method or two methods combined to realize the deep "anaerobic" environment of the S2ASH pool; the stirring power density of the equipment configuration (1~5) w/m ³ pool capacity, the actual operation optimal power density 0~3w/m ^3. Too high power is not conducive to maintaining an anaerobic environment; stirring maintains the ORP at -150 ~ -400mv, and the lower the ORP, the more conducive to the diversity of PAOs. The "deep anaerobic" environment of S2ASH can selectively cultivate Tetrasphaera phosphorus-accumulating bacteria with fermentation function, and build a "Tetrasphaera-Accumulibacter" double PAOs synergistic symbiosis mechanism in the biochemical system.

Further, a strain culture tank (SBIO-A) is set in the S2HBR reactor, and 2-4 culture tanks are set according to the design scale per 10,000 tons of sewage. The tank is equipped with two layers of medium and fillers. The first layer The double-check slow-release medium is humus, peat, clay, kaolin, calcium silicate, zero-valent iron, magnetite, trace elements (Ca ²⁺ , Mg ²⁺ , K ⁺ , etc.), activated carbon, bacillus sludge , zeolite, volcanic rock, trace elements required by microorganisms, adhesives, foaming agents and other compounds pressed into rods or spheres. The special sludge or preparation of Desulfobacillus, the added components can improve the microbial activity, can directional culture, enrich the deodorizing microorganisms and slowly release the microorganisms to the mixed solution in the side flow reaction tank; the check matrix filler needs to be replenished regularly, every 3-5 The annual replenishment rate is 1%-10% (weight ratio); the second layer of filler is natural spherical or massive light pumice, with an equivalent diameter of 3-8cm, and is porous, used to release minerals and act as a biofilm carrier Enrich functional microorganisms (deodorizing bacteria, nitrifying bacteria, etc.).

Preferably, the strain culture tank has an internal circulation "gas-liquid-solid" three-phase circulation channel.

Preferably, a microporous aeration head is provided at the bottom of the SBIO-A.

Further, the S2HBR-S2ASH reaction pool adopts one of rectangular, circular or oxidation ditch pool types.

Furthermore, the S2HBR-S2ASH reaction pool can be connected in series with 2-6 grids, among which S2HBR is 1-3 grids, and S2ASH is 1-3 grids.

Further, the S2HBR-S2ASH reaction tank is equipped with aeration and stirring equipment; the flow state can be selected from complete mixing type or push flow type.

Compared with the prior art, the utility model has the following technical effects and advantages:

In the utility model, through the arrangement of the "main-auxiliary" mode of the reactor, two side flow S2 reaction pools with independent functions on the "auxiliary" line can directionally enrich the special functional microbial flora, and the inoculation to the "main" line can significantly improve the And optimize the bacterial community structure of the entire activated sludge system, and significantly improve the removal efficiency of nitrogen and phosphorus in the biochemical system, and solve the problem that the traditional deodorization technology functional bacteria are slowly cultivated in the system, and cannot be stably cultivated and enriched to form dominant bacteria Technical deficiencies; through the deep anaerobic environment of S2ASH, the directional proliferation of PAOs with fermentation function for Tetrasphaera can be realized, which overcomes the problem of unstable phosphorus removal effect caused by the traditional activated sludge process relying solely on Accumulibacter PAOs, and also overcomes the traditional process of PAOs-GAOs The problem of strain competition has strengthened the effect of biological phosphorus removal in the system; and further increased the content of nitrifying bacteria in MLSS; simultaneously improved the deodorization effect of the whole process of sewage treatment, and simultaneously realized the reduction of MLVSS, which is very important for many in our country. The enhanced denitrification and dephosphorization of sewage with low C/N ratio in the area, and the addition of commercial carbon source saving have important and far-reaching economic and environmental benefits.

The directional enrichment of deodorizing bacteria and nitrifying bacteria is realized through the S2HBR reactor. The directional cultivation and proliferation of functional bacteria by S2HBR relies on the composite active biological matrix slow-release filler in the tank on the one hand, and on the other hand depends on the side flow activated sludge. The biochemical process control of the optimal habitat factors suitable for deodorizing functional bacteria in the reactor, in addition, the intermittent aeration mode can reduce the sludge yield by 10%-30% through the decoupling of activated sludge, effectively reducing the The production of biochemical sludge; S2ASH reactor realizes the directional enrichment culture of the new phosphorus-accumulating bacteria Tetrasphaera-PAO. The advantage of Tetrasphaera-PAO is that it does not depend on the influent VFA, and can be directly grown with macromolecular organic substances such as glucose and amino acids under anaerobic conditions. Anaerobic fermentation and phosphorus release, but requires a deep anaerobic environment; at the same time, Tetrasphaera-PAO has the function of denitrification and phosphorus removal in the subsequent anoxic environment, which can significantly improve the nitrogen and phosphorus removal effect of low C/N ratio wastewater; In addition, the lateral The deep anaerobic environment of flow sludge (≤-150mv) can suppress the growth of GAOs at the same time. Odorless.

The effect that needs to be specially explained is that the utility model is provided with a filter micro-sieve before the sludge returns to the S2 pool, which is used to remove inorganic impurities and fiber impurities in the return sludge, and to improve the effective microbial concentration of the S2 pool, maintain Bacterial activity, realize sludge reduction, reduce impurities in the S2HBR tank blockage and wear of mechanical equipment and aeration devices in the side flow tank, thereby improving the microbial activity of activated sludge in the entire "main-auxiliary" biochemical system. Crucial role. At the same time, the excess sludge discharged from the sewage plant can be discharged from the side flow tank, which greatly reduces the wear and tear of sludge treatment equipment such as sludge conveying screw pumps, sludge thickeners, sludge dewaterers and other mechanical equipment, and greatly prolongs sludge production. The device lifetime of the processing segment.

Description of drawings

The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 is the schematic flow sheet of the utility model system S2HBR-S2ASH serial mode one;

Fig. 2 is the schematic flow chart of the utility model system S2HBR-S2ASH serial mode two;

Fig. 3 is a schematic flow chart of the utility model system S2HBR-S2ASH parallel mode;

Fig. 4 is the elevation view of the biological cultivation tank (SBIO-A) in the utility model system S2HBR pond;

Fig. 5 is a top view of the biological culture tank (SBIO-A) in the S2HBR pool of the utility model system.

In the figure: 1-influent pump room and primary pretreatment facilities, 2-main biological pool, 3-secondary sedimentation tank, 4-reflux sludge pump room, 5-S2HBR pool, 6-bacteria culture tank SBIO-A, 7 -S2ASH pool, 8-SBIO-A culture tank body, 9-recheck matrix packing layer, 10-pumice packing layer, 11-aeration head, 12-cultivation tank mud outlet stainless steel filter, 13-sludge micro-sieve filter.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

This utility model is a "main-auxiliary" activated sludge system that couples deodorization and enhanced nitrogen and phosphorus removal. The "main line" biochemical system consists of water inlet pump room, primary pretreatment facility 1, main biological pool 2 and secondary sedimentation tank. 3. Connected by pipelines in turn, set up the sludge biological culture tank S2HBR pool 5 including the strain culture tank SBIO-A 6 and the activated sludge fermentation tank S2ASH pool 7 in the "auxiliary line". The combination of S2HBR and S2ASH is referred to as S2 pool; the main line It is connected with the radial line through the return sludge pump room 4; the sludge return line of the auxiliary line contains a sludge micro-sieve filter 13, and the sludge micro-sieve filter is set at the inlet of the S2 pool or on the sludge inlet pipeline; S2HBR and S2ASH Operate in series or in parallel. The specific operation process is:

In the series operation mode, part of the returned sludge is inoculated through the S2 pool to enrich the functional microorganisms of nitrifying bacteria and deodorizing bacteria. species, specifically:

As shown in Figure 1, the first method is that all the outflow of S2HBR enters S2ASH, and after S2ASH performs anaerobic hydrolysis and multiplication of PAOs, part of the mixed solution enters the anaerobic section, anoxic section or aerobic section of the main biological pool, and the other part enters the sewage plant The water inlet pipe realizes deodorization;

As shown in Figure 2, the second method is that part of the outflow of S2HBR is directly sent to the water inlet of the sewage plant for deodorization, and the remaining sludge enters the S2ASH pool, and this part of the sludge enters the main biological pool after S2ASH bioaugmentation and microbial proliferation;

As shown in Figure 3, in the parallel operation mode, the S2HBR pool and the S2ASH pool adopt independent inflows, of which part of the outflow from the S2HBR pool goes to the water inlet pipe for deodorization, and the other part enters the anoxic or aerobic section of the main biological pool for supplementary nitrification Bacteria and other functional microorganisms, the effluent from the S2ASH pool directly enters the anaerobic section of the main biological pool for enhanced biological phosphorus removal.

The strain culture tank SBIO-A 6 among the accompanying drawings 4 comprises the SBIO-A culture tank tank body 8, and two kinds of biological culture mediums are set up and down in the upper and lower layers of the tank body: check matrix filler layer 9 and pumice filler layer 10, and in The top of the tank body is provided with a stainless steel filter screen 12 at the mud outlet of the culture tank, and an aeration head 11 is arranged in the strain culture tank SBIO-A.

Example 1:

Take the upgrade of a 50,000 m ³ /d sewage plant as an example. The discharge standard of the upgrade is upgraded from the first-level A standard to the "quasi-four category".

Removal rate table of pollutants in and out of a sewage treatment plant

For this reason, the process flow of this transformation plan is shown in Figure 1. The "S2HBR-S2ASH process" involved in the utility model is selected, and a new group of side streams "S2HBR-S2ASH" is newly built, and two rectangular reaction pools are connected in series to lead backflow pumps. House sludge 105m ³ /h is filtered by two micro-sieves with a filtration precision of 250 microns and then sent to the side flow S2 tank, and the remaining RAS is directly returned to the anaerobic tank. Among them, the S2HBR pool is equipped with 12 microbial culture tanks, and the upper and lower layers of biological culture beds in the tank are pre-filled with double-check matrix filler S and pumice filler layer F filler respectively. The outflow of S2 tank is divided into two ways, one way is 2m ³ /h to the water inlet pipe for deodorization, the other way is 103m ³ /h to the anaerobic part of the main biological tank, and the remaining sludge return flow of 936m ³ /h directly enters the main biological tank without going through the S2 tank Biological pool anaerobic pool. The residence time of S2HBR is 3h, aeration and agitator are set, and intermittent aeration is controlled according to the online DO and NH3-N instrument signals; the residence time of S2ASH tank is 24h, only agitator is set, the stirring power is 2w/m ³ , and the operation of S2ASH pool is controlled ORP= -150 to -300mv; the structure of the original biological pool remains unchanged, the design of the main biological pool is MLSS=3000mg/L, the reflux ratio of the secondary sedimentation tank is maintained at 50%-100%, and the return sludge concentration is controlled at 6000-9000mg/L. After the transformation, the effluent index is better than the design standard, the NH3-N is stably lower than 1mg/L throughout the year, and the TP of the secondary sedimentation effluent is stably lower than 0.4mg/L without adding chemical phosphorus removal agents; and the whole process of deodorization and dehydration The dewatered sludge in the machine room is odorless and has obvious humification.

Example 2:

Due to the increase in the concentration of influent pollutants, the A sewage treatment plant in a certain city cannot meet the standards stably, and the air pollution to the surrounding environment is relatively large, causing complaints from nearby residents. The scale of the plant is 120,000 m ³ /d, and the Carrousel 2000 oxidation ditch process is adopted. The process flow of this transformation plan is shown in Figure 2. The original 4-cell anaerobic tanks in series are transformed into S2HBR pools (the first 3 cells) and S2ASH pools (the last 1 cell), in which 24 microbial culture tanks are placed in the S2HBR pools. Fill two layers of packing S and F, and add an aeration device, design the MLSS of the main organism to be 4000mg/L, control the frequency conversion of the total return flow at 33%-40%, and control the actual return sludge concentration at 12000-14000mg/L, and lead back flow sewage The total amount of mud of 150m ³ /h is filtered by two micro-sieves with a filtration accuracy of 600 microns before being sent to the S2 pool. The residence time of the S2HBR pool is 24h. The online DO and NH3-N instruments are installed in the S2HBR pool and intermittent aeration is adopted; the S2ASH pool stays The time is 1h, the stirring power of the S2ASH pool is 3w/m ³ , and the ORP is controlled at -200 to -350mv. 5m ³ /h of the effluent from S2ASH returns to the main water inlet of the sewage plant, another 145m ³ /h enters the anaerobic tank, and the remaining 2350m ³ /h of RAS crosses the S2 tank and directly enters the oxidation ditch. After the transformation, the 95% guarantee rate of NH ₃ -N in the effluent of the sewage plant is below 2mg/L, the TP95% guarantee rate reaches 0.4mg/L, and the environmental protection detection of odorous gas at the factory boundary reaches the standard.

Example 3:

For a 60,000 m ³ /d sewage plant, the standard was raised from Class I B to "quasi-IV", requiring COD＝40mg/L, TN＝10mg/L, TP＝0.3mg/L, NH3-N＝2mg/L . The primary organism pool is the Aubert Oxidation Ditch. The process flow of this transformation plan is shown in Figure 3. The original selection pool was transformed into a side flow S2ASH pool, and a new S2HBR pool was built, of which 18 microbial culture tanks were placed in the S2HBR pool (the tanks were filled with two layers of S and F fillers), and two The side flow tank is operated in parallel mode, the main biological MLSS is designed to be 4.5g/L, the reflux ratio is controlled by frequency conversion speed regulation to 33%-45%, the return sludge concentration is controlled at 14500-18000mg/L, and the sludge is drawn from the sludge return pump room Sludge 135m ³ /h is filtered by two 300 micron micro-sieves to the S2 tank, of which 60m ³ /h of return sludge is sent to S2HBR tank, and the residence time of S2HBR tank is 12h; 75m ³ /h of return flow sludge is sent to S2ASH tank , the residence time of S2ASH pool is 12h, the stirring power of S2ASH pool is 2w/m ³ , and the ORP is controlled at -300 to -400mv. 25m ³ /h of S2HBR effluent returns to the water inlet main of the sewage plant, and another 35m ³ /h enters the anaerobic tank, and the remaining 990m ³ /h of the total external return flow of RAS crosses the S2 tank and directly enters the oxidation ditch. After the transformation, the effluent of the sewage plant has reached the standard stably, and the environmental protection detection of the odorous gas at the factory boundary has reached the standard.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the Within the scope of protection of the present invention.

Claims (10)

1. A "main-auxiliary" activated sludge system coupled with deodorization and enhanced nitrogen and phosphorus removal, characterized in that: the system includes at least four reactors, specifically: at least the main biological reaction tank is included on the main line , Secondary settling tank, on the sludge return line of the auxiliary line at least includes the sludge biological culture tank S2HBR with the strain culture tank SBIO-A and the activated sludge fermentation tank S2ASH, and the combination of S2HBR and S2ASH is referred to as the S2 pool; the main line and The radial line is connected through the return sludge pump room and the pipeline; S2HBR and S2ASH run in series or in parallel. 2. The system according to claim 1, characterized in that: a sludge micro-sieve filter is included on the sludge return line of the auxiliary line, and the sludge micro-sieve filter is arranged at the inlet of the S2 pool or on the sludge inlet pipeline. 3. The system according to claim 1 or 2, characterized in that: In the series operation mode, two sludge return pipelines are installed at the outlet of the return sludge pump room, one sludge return pipeline is directly connected by the outlet of the return sludge pump room and the entrance of the main biological pool, and the other sludge return pipeline is connected by the return flow pipe The outlet of the sludge pump room is connected to the inlet of the S2 pool, and the outlet pipeline of the S2 pool is set into two types of pipeline branches: The first method is: the outlet of the S2HBR pool is connected to the inlet of the S2ASH pool through pipes, channels or flow holes, and two branch pipes are continued to be set from the S2ASH pool, one branch pipe is connected to the main biological pool line, and the other branch pipe is The pipeline is connected to the water inlet pipe of the sewage plant; The second method is: set two outflow branches at the outlet of the S2HBR pool, one branch pipe is directly connected to the sewage plant inlet pipe, and the other branch pipe is connected to the inlet of the S2ASH pool, and then the outlet of the S2ASH pool is connected to the main biological pool Direct connection via pipes, channels or flow holes. 4. The system according to claim 1 or 2, characterized in that: In the parallel operation mode, three sludge return pipes are installed at the outlet of the return sludge pump room, the first sludge return pipe is directly connected to the main bio-pool inlet by the outlet of the return sludge pump room, and the second sludge return pipe is The pipeline is connected from the outlet of the return sludge pump room to the inlet of the S2ASH pool, and then a return pipeline, channel or flow hole is set at the outlet of the S2ASH pool to connect with the inlet of the main biological pool, and the third sludge return pipeline is connected by the return sludge pump room The outlet is connected to the inlet of the S2HBR pool, and then two branch pipes are set at the outlet of the S2HBR pool, one branch pipe is connected to the main biological pool entrance and the other branch pipe is connected to the sewage plant inlet pipe. 5. The system according to claim 1, characterized in that: the strain culture tank SBIO-A is respectively equipped with an upper and lower culture medium layer and a filler layer. 6. The system according to claim 1, characterized in that: 2-4 bacteria culture tanks SBIO-A are installed per 10,000 tons of sewage design scale. 7. The system according to claim 1, characterized in that: the strain culture tank SBIO-A has an internal circulation "gas-liquid-solid" three-phase circulation channel. 8. The system according to claim 1, characterized in that: a microporous aeration head is arranged at the bottom of the strain culture tank SBIO-A. 9. The system according to claim 1, characterized in that: the S2 pool adopts one of a rectangular structure, a circular structure or an oxidation ditch pool type. 10. The system according to claim 1, characterized in that 2-6 grids are connected in series for the S2 pool.