WO2012010096A1 - Device for synchronously removing nitrogen and phosphorus in mixed municipal sewage and fecal sewage by using a2/o-biomembrane and method thereof - Google Patents

Abstract

A device for synchronously removing nitrogen and phosphorus in mixed municipal sewage and fecal sewage by using A²/O-biomembrane is provided, which comprises an anaerobic tank (1), an anoxic tank (2), a first aerobic tank (3), a second aerobic tank (15) and a sedimentation tank (4) connected in turn. The second aerobic tank (15) is connected with the anoxic tank (2) through a pipeline (8) and a mixed-liquid reflux pump (9), and the sedimentation tank (4) is connected with the anaerobic tank (1) through a pipeline (7) and a sludge reflux pump (14). Suspended filling materials (11) are dispensed into the first aerobic tank (3) and the second aerobic tank (15) and the suspended filling materials are three-dimensional hollow light porous ceramisite. At the same time, a method for synchronously removing nitrogen and phosphorus in mixed municipal sewage and fecal sewage by using A²/O-biomembrane is also provided. In the method, by feeding the suspended filling materials into an aeration tank in the traditional A²O technology, carriers with the surface for attachment and growth of microorganism are provided, biomass in the aeration tank is increased, treating ability for waste water is improved and sewage bulking is overcome, and simultaneous existence attached phases and suspended phases in the aeration tank sufficiently exerts their superiority. On the premise that the volume of a reactor is not increased, the method intensifies a nitration reaction condition, improves the function of removing nitrogen and phosphorus in the traditional active sludge method technology, solves the contradiction of sludge age which exists in the nitrogen and phosphorus removing process of the traditional A²/O technology and has good water processing effect.

Description

A2/O-biofilm synchronous nitrogen and phosphorus removal device and method for urban sewage mixed fecal sewage

Technical field

The invention relates to a wastewater treatment technology, in particular to an A ² /O-biofilm synchronous nitrogen and phosphorus removal treatment device for urban sewage mixed fecal sewage and a process thereof.

Background technique

 Currently widely used LED drivers are powered by several hundred watts or less, and each LED luminaire integrates a separate power supply and an LED. Light, as shown in Figure 1. Shown. This kind of power supply brings the following problems: First, the design of the luminaire should consider the position and heat dissipation of the power supply, the volume is large, the design of the luminaire is limited by the power supply, and the cost is increased. Second, once the power supply is damaged, the entire luminaire is scrapped at the same time, and the cost is high and the life is short. ; three is more than Uniform dimming control of LEDs is not easy to achieve.

 In view of the above deficiencies, the present invention overcomes the above problems and invents an LED centralized DC power supply system.

In the existing biological treatment of sewage and wastewater, the removal of nitrogen and phosphorus is much more complicated than the removal of carbon. It involves nitrogen nitrification, denitrification, microbial phosphorus release and phosphorus uptake, and each of the above processes. The purpose is different, and the requirements for microbial composition, matrix type and environmental conditions are also different. How to organically combine various appropriate reaction conditions in a water treatment device is an important issue.

Since 1929, Wuhrmann established a post-denitrification process to remove nitrogen from municipal wastewater using microbial endogenous sources. After more than half a century of improvement and development, in 1984, Deakyne, Patel and Krichten proposed the current water treatment project. The most common application, the most simple process A ₁ (Anaerobic) A ₂ (anoxic) O (Oxygen) Denitrification and dephosphorization process, referred to as A ₁ A ₂ O process or A ² /O process.

The A ² /O process consists of an anaerobic zone, an anoxic zone, an aerobic zone, a sedimentation zone and two reflux systems. Its function is anaerobic phosphorus release, anoxic denitrification and denitrification, aerobic nitrification, and precipitation. After the muddy water is separated, the phosphorus is removed with the excess sludge, but the process has two major defects:

First, the conflict of mud age affects the effect of nitrogen and phosphorus removal. Nitrifying bacteria are usually autotrophic obligate aerobic bacteria with a long generation. In winter, the generation of nitrifying bacteria can last for more than 30 days, even in the summer, when the mud age is less than The nitrification in the 5-day activated sludge process system is also very weak. Phosphorus-accumulating bacteria and denitrifying bacteria are mostly short-soil-aged microorganisms. The mud age is generally less than 10 days. The shorter the mud age, the faster the denitrification rate. The 4-day mud age is 8 days of mud age. 2.5 times. It is also reported that in the Hyperion wastewater treatment plant in the United States, when the water temperature is 22~24 °C, the phosphorus removal system has a sludge age of 3.1 days, while the effluent phosphorus is only 0.4 mg/L. . This shows that the generation time of polyphosphate bacteria is indeed very short. In addition, the only way for biological phosphorus removal is to eliminate excess sludge, and also require short mud age to allow more phosphorus to be removed with excess sludge. Obviously, there is a contradiction between the nitrifying bacteria and the polyphosphate bacteria in the mud age. When the two types of microorganisms use a reflux sludge system together, the mud age of the whole system has to be controlled in a narrow range. The system has the functions of nitrogen and phosphorus removal, but it can not make the two types of microorganisms exert their respective advantages and affect the effect of nitrogen and phosphorus removal.

A ₁ /OA ₂ /O process and A ₁ /A ₂ /OO process have been developed for the conflict of mud age. This water treatment process has a limited solution to the mud age contradiction than the conventional A ² /O process, but its water treatment process is further complicated, there is insufficient denitrification carbon source, and the nitrification sludge can not be reused. And so far, no better way has been seen to solve the problem of the conflict of mud age.

Second, the nitrate in the return sludge affects the phosphorus and nitrogen removal process of the process. In the conventional A ² /O process, the anaerobic zone is set a front, and the return sludge will inevitably bring a part of the nitrate into the zone, which will seriously affect the phosphorus release rate of the polyphosphate bacteria, especially when entering the water VFA. Less, when the phosphorus content of the sludge is not high, the presence of nitrate may even cause the phosphorus accumulating bacteria to directly absorb phosphorus. Therefore, under the framework of the conventional A ² /O process, how to prevent the nitrate from entering the anaerobic zone to interfere with the polyphosphate The release of phosphorus from bacteria has become a research hotspot. The key to solving the problem of nitrate is how to recover the nitrates carried by the return sludge before it enters the anaerobic zone. Around this issue, people have proposed, JHB process, EASC process, UCT process, etc. In recent years, some scholars have proposed the idea of inverting the AAO process. By replacing the mixed liquid reflux of the conventional AAO process with 100%~200% sludge reflux, the process pre-empts the anoxic tank to improve the denitrification effect and also avoids the interference of nitrate by the anaerobic tank.

The manure sewage comes from the urban manure treatment station, which is the fecal filter liquid after the manure is filtered and desanded. It belongs to the high ammonia nitrogen high organic matter concentration sewage and must be treated harmlessly. Fecal sewage is rich in organic matter and nitrogen, phosphorus and other substances. If it is directly discharged, it will cause water pollution to emit harmful gases containing odorous components such as ammonia, hydrogen sulfide, mercaptans and thioethers, causing serious pollution to the environment. The main ways to deal with fecal sewage in China are as follows: 1 separate treatment, which is difficult to process, long in process flow, high in operating cost, complicated in operation management; 2 incorporation into urban sewage treatment plants. The main sources of fecal sewage are 2 One: the sanitation public toilets, except for some agricultural use, the rest are transported to the harmless treatment plant, after the slag treatment, into the sewage treatment plant; second, the social septic tank (except the sanitation public toilets, residential buildings, office buildings, The manure produced by the hotel and hotel septic tanks is discharged to the sewage pipe network after being treated to a harmless standard by three-stage septic treatment, and is sent to a sewage treatment plant for treatment. There is no relatively complete fecal harmless treatment plant in China, and some urban manure disposal stations have no feces. Sewage treatment facilities in order to maximize the use of existing facilities Because the fecal sewage has the characteristics of high organic matter concentration and high nitrogen content, the buffering, dilution and nutrient balance of the municipal sewage can be utilized to reduce the difficulty of treating the fecal sewage and improve the biodegradability of urban sewage treatment. Therefore, the urban sewage treatment plant is responsible for the treatment of fecal sewage and becomes a feasible technology for treating fecal sewage. However, after the actual operation of urban sewage and the sewage from the harmless treatment plant are combined, the high-concentration water quality of the fecal liquid often has various adverse effects on the urban domestic sewage plant, and has a serious impact on the inhibition of nitrification, especially affecting The ammonia nitrogen and total nitrogen in the water are discharged, and the nitrogen removal rate is reduced.

 Therefore, the stable and high-efficiency nitrogen removal of mixed sewage is the key to achieving the simultaneous treatment of fecal sewage and urban sewage, and the primary problem to be solved. The proposal of this technology is of great practical significance for properly handling fecal sewage and reducing water pollution.

Summary of the invention

 The object of the present invention is to overcome the disadvantages of the prior art and provide an overcoming of sludge expansion to solve the traditional AAO. Process in the process of nitrogen and phosphorus removal, the problem of mud age contradiction, urban sewage mixed fecal sewage A2 / O - biofilm synchronous nitrogen and phosphorus removal device.

Another object of the present invention is to provide a method for simultaneous nitrogen and phosphorus removal by municipal wastewater and fecal sewage A ² /O-biofilm using the above apparatus.

The invention adds suspended filler in the aeration tank of the traditional AAO process to provide a carrier for attaching the growth surface of the microorganism, and the adhesion phase and the suspension phase are simultaneously present in the aeration tank, thereby forming an A ² /O-biofilm process. The invention improves the biomass in the gas pool, strengthens the conditions for the nitrification reaction, increases the treatment capacity of the wastewater, overcomes the sludge expansion, improves the stability of the operation, and improves the function of the nitrogen and phosphorus removal by the traditional activated sludge process. And solve the problem of the age difference of the traditional AAO process in the process of nitrogen and phosphorus removal.

 The first object of the present invention is achieved by the following technical solutions:

A ² / O-biofilm synchronous nitrogen and phosphorus removal device for urban sewage and fecal sewage, comprising anaerobic pool, anoxic tank, first aerobic tank, second aerobic tank and sedimentation tank connected in sequence; anaerobic a stirring paddle is arranged in the pool and the anoxic tank respectively, and an aeration head is respectively arranged at the bottom of the first aerobic pool and the second aerobic pool, and the two aeration heads are respectively connected with the two air compressors; the second aerobic tank passes The pipeline and the mixed liquid reflux pump are connected to the anoxic tank, and the sedimentation tank is connected to the anaerobic tank through the pipeline and the sludge return pump; the second aerobic tank of the first aerobic tank is dispersed with the suspended filler; the suspended filler is three-dimensional hollow The light porous ceramsite is calculated according to the total volume of the first aerobic tank and the second aerobic tank, and the dosing ratio of the suspended filler is 20% to 30%, wherein, by volume, the first aerobic pool and the second The suspension loading ratio of the aerobic tank is 1:1-3.

 The anaerobic tank, the anoxic tank, the first aerobic tank and the second aerobic tank are preferably disposed in the same casing and separated by a partition.

 The suspension ratio of the first aerobic tank and the second aerobic tank is preferably 1 : 3 .

 The volume ratio of the first aerobic tank to the second aerobic tank is preferably 1:1.

 Another object of the present invention is achieved by the following technical solutions:

Urban sewage and fecal sewage A ² /O- biofilm simultaneous nitrogen and phosphorus removal method using the above device: urban sewage and fecal sewage and return sludge first enter the anaerobic tank to release phosphorus, and then enter the anoxic tank for denitrification dehydrogenation Then, the municipal sewage and fecal sewage enter the first aerobic tank and the second aerobic tank in turn, and under the action of nitrifying bacteria on the suspended filler in the first aerobic tank and the second aerobic tank, the nitrifying phosphorus is absorbed, and the nitrifying bacteria grow. On the activated sludge of suspended filler, activated sludge can cultivate polyphosphate bacteria and denitrifying bacteria to increase the excess sludge removal. The hydraulic retention time of the first aerobic tank and the second aerobic tank is 4-8h; After the urban sewage and fecal sewage are separated by mud water, the sludge volume is returned to the anaerobic zone at a ratio of 40-80%, and the excess sludge is discharged; the effluent is discharged from the sedimentation tank.

 Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention provides a carrier for attaching a growth surface of a microorganism by suspending a suspension filler in the first aerobic tank and the second aerobic tank on the basis of the existing A ² /O-biofilm process. Enriched nitrifying bacteria on the filler, which better solves the contradiction of sludge age of biological nitrogen and phosphorus removal, so that the anaerobic pool avoids the interference of nitrate. It also increases the biomass in the aeration tank, increases the treatment capacity of the wastewater, overcomes the expansion of the sludge, and makes the adhes and the suspended phase simultaneously exist in the aeration tank, giving full play to the superiority of both.

 ( 2 ) The invention alleviates the tension of the water source, and provides an economical, convenient, reasonable and feasible solution for the comprehensive treatment and disposal of the fecal sewage, because it does not need to occupy more land or increase the capital investment, which not only has great social benefits, but also has great social benefits. Bringing considerable economic and environmental benefits and promoting the development of wastewater treatment resources.

(3) The treatment process of the A ² /O-biofilm simultaneous nitrogen and phosphorus removal process of the invention has the following effects on the removal of pollutants: the removal effect of COD and phosphorus is good, the effluent COD is below 40 mg/L, and the phosphorus effluent is at 0.35. Below mg/L; the effluent ammonia nitrogen is below 4mg/L. All effluent water quality indicators have met and exceeded the national emission standard level one standard.

 DRAWINGS

Figure 1 is a schematic view showing the structure of a synchronous denitrification and dephosphorization device for A ² /O-biofilm of municipal sewage mixed fecal sewage;

 Figure 2 is a diagram showing the effect of removing the COD by the device of Figure 1;

 Figure 3 is a diagram showing the effect of removing the ammonia nitrogen from the device of Figure 1;

 Figure 4 is a diagram showing the effect of removing the total nitrogen from the apparatus of Figure 1;

 Figure 5 is a diagram showing the effect of removing the total phosphorus from the device of Figure 1.

 detailed description

The invention is further described below in conjunction with the accompanying drawings and embodiments, but the scope of the invention is not limited to the scope described in the specific embodiments.

As shown in Figure 1, the municipal sewage mixed fecal sewage A ² /O- biofilm simultaneous nitrogen and phosphorus removal device comprises an anaerobic tank 1 connected in sequence, an anoxic tank 2, a first aerobic tank 3, and a second aerobic tank. 15 and the sedimentation tank 4; a stirring paddle 12 is respectively arranged in the anaerobic tank and the anoxic tank, and an aeration head is respectively arranged at the bottom of the first aerobic tank and the second aerobic tank, and the aeration head 13 is respectively connected with the air compressor 10 The second aerobic tank is connected to the anoxic tank through the pipe 8 and the mixed liquid return pump 9, and the sedimentation tank 4 is connected to the anaerobic tank through the pipe 7 and the sludge return pump 14; the first aerobic tank and the second aerobic tank Dispersed with suspended filler 8 . Suspension packing 11 is a three-dimensional hollow lightweight porous ceramsite, the specification model is ø25×9mm, the density is less than water, 0.8g / cm ³ , and the suspended packing is in 2 aerobic tanks (first aerobic tank and second aerobic tank) The total volumetric ratio of the pool is 20% to 30%. Since the suspended filler 8 is a light porous ceramsite, the surface is easy to adhere to activated sludge, providing a carrier for the growth environment of the nitrifying bacteria in the activated sludge. Wherein the volume ratio of the suspended fillers added in the first aerobic tank III and the second aerobic tank IV is 1:1-3, that is, the dosing mode is 1:1-3, and the preferred dosing mode is 1:3. . The anaerobic tank, the anoxic tank, the first aerobic tank and the second aerobic tank are disposed in the same casing and are separated by a partition. The aerobic pool is divided into two pools before and after, which are the first aerobic tank and the second aerobic tank respectively.

 The process consists of anaerobic zone and anoxic zone, 2 An aerobic feed area is formed. The anaerobic zone is at the head end, and the anoxic zone is in the anaerobic zone. The suspended filler is placed in the aerobic feed zone according to the water treatment requirements. The reflux sludge pump connects the anaerobic zone and the sedimentation tank, and the mixed liquid reflux pump will be short. The oxygen pool is connected to the aerobic packing tank.

When the device is working, the urban sewage and fecal sewage and the return sludge first enter the anaerobic tank to release phosphorus, and then enter the anoxic tank for denitrification dehydrogenation; then the urban sewage and fecal sewage enter the first aerobic tank and the second aerobic The pool is subjected to nitrification and phosphorus absorption in the activated sludge attached to the suspended sludge in the first aerobic tank and the second aerobic tank, and the purpose of adding the filler is to provide a carrier for the nitrifying bacteria growth environment. In the first aerobic tank and the second aerobic tank, the suspended filler does not participate in the reflux, and the nitrifying bacteria with longer mud age can be grown thereon for nitrification and phosphorus uptake; More than 30d, but the mud age of polyphosphate and denitrifying bacteria is generally 10d Within, the nitrifying bacteria and polyphosphate bacteria have contradictions in the age of the mud. Activated sludge can be separately cultured with polyphosphate bacteria and denitrifying bacteria to increase the amount of excess sludge, which is also in line with the requirements of phosphorus removal by phosphorus sludge of short sludge age, which can solve the conflict of sludge age in sewage treatment process. Then the urban sewage and fecal sewage enter the sedimentation tank in turn, after the sludge is separated, the sludge is volume-by-volume. The proportion of 40% to 80% is returned to the anaerobic zone, and the excess sludge is discharged; the effluent 6 Exhausted from the sedimentation tank. The reflux sludge system connects the anaerobic tank and the sedimentation tank to ensure the good operation of the nitrification reaction; the mixed liquid reflux system connects the anoxic tank and the aerobic packing tank to improve the mixing efficiency of the aerobic packing pool and thereby increase the oxygen usage efficiency.

 Example

The municipal sewage mixed fecal sewage A ² /O- biofilm synchronous nitrogen and phosphorus removal device is a steel plate texture with a designed water volume of 500L / h, a total length of 2.9m, a width of 1.2m, a height of 1.3m, and an effective volume of about 3.8m. ^{3. The} reaction cell is divided into an anaerobic tank, an anoxic tank, a first aerobic tank and a second aerobic tank through a partition, wherein the effective volume of the anaerobic tank is 0.5 m ³ ; the effective volume of the anoxic tank is 0.8 m ³ , and the two pools The stirring paddle 12 is installed, and the motor speed is 1390r/min. The first aerobic tank and the second aerobic tank have an effective volume of 2.5 m ³ , and the bottom is respectively provided with an aeration head, which can control the aeration amount through the valve, and the second aerobic tank is equipped with an online dissolved oxygen analyzer, in aerobic A mixed liquid return line is installed at the end of the tank. The end of the system is an advection sedimentation tank with an effective volume of 0.9 m ³ and a sludge discharge pipe and a sludge return pipe at the bottom. According to the actual operation, the reflux of the mixture and the flow rate of the sludge are bypassed, and the excess flow is partially returned to the end of the aerobic tank and the sedimentation tank by the branch pipe. The first aerobic tank and the second aerobic tank are dispersed with suspended fillers 11 (the suspended filler is a three-dimensional hollow lightweight porous ceramsite, the specification is ø25×9mm, the density is less than water, 0.8g / cm ³ , the volume of the suspended filler The ratio of dosing is 20% to 30%). Influent 5 is pumped directly from the grit chamber by a submersible pump and bypassed for flow control. The effluent 7 is discharged from the sedimentation tank V.

The average ammonia nitrogen concentration of municipal sewage mixed fecal sewage is 23.29mg/L, the average influent total nitrogen concentration is 24.33mg/L, the average influent total phosphorus concentration is 3.15mg/L, and the average influent COD concentration is 134.81mg/L. . The effects of various factors, A ² /O-biofilm simultaneous nitrogen and phosphorus removal treatment were investigated, and the investigation time was 4d. The results of the single factor experiment are as follows:

 (1) When the filling method is 1: 3, the average removal rate of ammonia nitrogen is 92.73%; the average removal rate of total nitrogen is 72.16%. The average removal rate of total phosphorus was 88.02%; the average removal rate of COD was 74.51%.

 (2) When the aerobic tank hydraulic retention time is 4h, the average removal rate of ammonia nitrogen is 92.73%; the average removal rate of total nitrogen is 72.16%. The average COD removal rate was 74.51%.

 (3) When the reflux ratio of the mixture is 120%, the average removal rate of ammonia nitrogen is 82.02%; the average removal rate of total nitrogen is 64.87%. The average removal rate of total phosphorus was 89.3%; the average removal rate of COD was 71.77%.

 (4) When the sludge reflux ratio is 40%, the average removal rate of ammonia nitrogen is 76.45%; the average removal rate of total nitrogen is 57.35%. The average removal rate of total phosphorus was 88.36%; the average removal rate of COD was 71.76%.

 Implementation Effect

According to the above single factor experiment, the results of the treatment process of A ² /O-biofilm simultaneous nitrogen and phosphorus removal were investigated. The total volumetric ratio of suspended filler in the two aerobic tanks was 20% to 30%. The volume ratio of suspended fillers in aerobic tank III and second aerobic tank IV is 1:3, that is, the dosing mode is 1:3; the aerobic tank hydraulic retention time is 4h; the reflux ratio of the mixture is 120%; The sludge reflux ratio was 40%, and the four conditions were comprehensively applied. The effect of the simultaneous treatment of A ² /O-biofilm on nitrogen and phosphorus removal was investigated. The reaction cycle is 30 days.

1.  COD removal effect

It can be seen from Fig. 2 that the treatment process of A ² /O-biofilm simultaneous nitrogen and phosphorus removal has a good removal effect on COD. The COD concentration of the mixed sewage entering the pilot plant varies greatly, and the COD concentration of the influent water is generally low. The effluent COD concentration is also relatively low, indicating that organic pollutants have been fully utilized. The average influent COD is around 134.81 mg/L, while the effluent COD is generally below 40 mg/L. The COD removal rate is up to 88.37% and the average removal rate is up to 70.41%. COD is the carbon source for microbial growth in wastewater treatment. When denitrifying and dephosphorizing the sewage, denitrifying denitrifying bacteria belong to heterotrophic facultative anaerobic bacteria. When anaerobic conditions are used, organic carbon is used as electron supply. The body and nutrient source are subjected to denitrification. Phosphorus-producing bacteria that achieve phosphorus removal need to actively absorb the acetic acid which is converted into organic matter by anaerobic fermentation of acid-producing bacteria, which also consumes carbon sources. At the same time, the growth of microorganisms also requires the conversion of organic matter in the sewage into components of their own cells.

 2, ammonia nitrogen and total nitrogen removal effect

 Figure 3 and Figure 4 It can be seen that the total nitrogen concentration in the mixed sewage entering the pilot plant is relatively low, but the fluctuation of the high nitrogen content and instantaneous mixing of the manure sewage is relatively large. Among them, the minimum TN concentration of the influent water is above 20 mg/L, and the maximum water inflow is highest. The concentration of TN is 38.63mg/L, and the average influent TN is 24.33mg/L. After denitrifying denitrification by microorganisms, the total effluent nitrogen is generally below 15mg/L, and the lowest concentration of effluent is 11.03mg / L, the highest concentration of effluent was 14.36mg / L, an average of 12.9mg / L Within the scope of emission standards, it is mainly due to the system's efficient and stable nitrification effect, which ensures the nitrogen removal effect of the system.

 3, the removal effect of total phosphorus

It can be seen from Fig. 5 that it can be seen that the treatment process of simultaneous denitrification and dephosphorization of A ² /O-biofilm has a good removal effect on total phosphorus. The fluctuation of the total phosphorus concentration is relatively large. The minimum concentration of influent TP is 1.66mg/L, the highest concentration is 6.26mg/L, and the average concentration is 3.15mg/L. After dephosphorylation by microorganisms, the effluent TP is generally below 0.5mg/L, with an average of 0.35mg/L. . The TP removal rate is above 75%, the highest is 96.72%, and the average removal rate is 88.79%.

Combining the above experiments, the removal process of the A ² /O-biofilm simultaneous nitrogen and phosphorus removal process of the present invention has the following effects on the removal of pollutants: the removal effect of COD and phosphorus is good, and the effluent COD is

 Below 40mg/L, phosphorus effluent is below 0.35mg/L; effluent ammonia nitrogen is at 4mg/L the following. All effluent water quality indicators have met and exceeded national first-level emission standards.

Claims (1)

1 . An A ² /O-biofilm synchronous nitrogen and phosphorus removal device for urban sewage and fecal sewage, comprising an anaerobic tank, an anoxic tank, a first aerobic tank, a second aerobic tank and a sedimentation tank connected in sequence; a stirring paddle is arranged in the anaerobic pool and the anoxic tank respectively, and an aeration head is respectively arranged at the bottom of the first aerobic pool and the second aerobic pool, and the two aeration heads are respectively connected with the two air compressors; The second aerobic tank is connected to the anoxic tank through the pipeline and the mixed liquid reflux pump, and the sedimentation tank is connected to the anaerobic tank through the pipeline and the sludge return pump; the suspended suspension is dispersed in the second aerobic tank of the first aerobic tank; The suspended filler is a three-dimensional hollow lightweight porous ceramsite. According to the total volume of the first aerobic tank and the second aerobic tank, the dosing ratio of the suspended filler is 20% to 30%, wherein, by volume, the first The suspension loading ratio of the aerobic tank and the second aerobic tank is 1:1-3. 2. The A ² /O-biofilm synchronous nitrogen and phosphorus removal device for urban sewage and fecal sewage according to claim 1, wherein the anaerobic tank, the anoxic tank, the first aerobic tank and the second The aerobic tanks are placed in the same housing and separated by a partition. The A ² /O-biofilm synchronous nitrogen and phosphorus removal device for urban sewage and fecal sewage according to claim 1, characterized in that: the suspension loading of the first aerobic tank and the second aerobic tank The ratio is 1:3. The A ² /O-biofilm synchronous nitrogen and phosphorus removal device for urban sewage and fecal sewage according to claim 1, wherein the volume ratio of the first aerobic pool to the second aerobic pool is 1 : 1 . 5 . The method for simultaneously denitrifying and dephosphorizing A ² /O-biofilm of urban sewage and fecal sewage according to the device of claim 1 , wherein the urban sewage and the fecal sewage and the return sludge first enter the anaerobic tank to release phosphorus. Then enter the anoxic tank for denitrification dehydrogenation; then the urban sewage and fecal sewage enter the first aerobic tank and the second aerobic tank in turn, and the nitrifying bacteria on the suspended filler in the first aerobic tank and the second aerobic tank Under the nitrification, the nitrifying bacteria are grown on the activated sludge of the suspended filler, and the activated sludge can separately culture the polyphosphate bacteria and the denitrifying bacteria to increase the excess sludge excretion, the first aerobic pool and the second aerobic The hydraulic retention time of the pool is 4-8h; after the municipal sewage and fecal sewage are separated by mud water, the sludge volume is returned to the anaerobic zone at a ratio of 40-80%, and the excess sludge is discharged; the effluent is discharged from the sedimentation tank.

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