CN106904796A - A kind of multilevel deflector-type SSMBBR sewage disposal systems and processing method - Google Patents

Abstract

The invention belongs to the technical field of sewage treatment, and in particular relates to a multi-stage diversion type SSMBBR sewage treatment system and a sewage treatment method. The present invention is based on the multi-stage diversion type SSMBBR sewage treatment process and adopts "grid + regulating tank + multi-stage diversion type SSMBBR sewage treatment system + filter cloth filter + ultraviolet disinfection" as the main process, wherein the multi-stage diversion type SSMBBR sewage The treatment system is divided into anaerobic section, denitrification section, aerobic section, filtration section, and sedimentation section. Through the reasonable addition of deflectors, functional partitions are realized, liquid streamlines are optimized, water head loss is reduced, and residence time is prolonged. , greatly improving the treatment effect of the reactor, and the effluent water quality is stable for a long time.

Description

A multi-stage diversion type SSMBBR sewage treatment system and treatment method

technical field

The invention belongs to the technical field of sewage treatment, and in particular relates to a multi-stage diversion type SSMBBR sewage treatment system and a sewage treatment method.

Background technique

A new type of multi-stage diversion SSMBBR sewage treatment system is divided into five reaction zones, which are anaerobic section, denitrification section, aerobic section, filtration section, and sedimentation section. A large number of suspended carriers can increase the biomass and biological species in the reactor, thereby improving the treatment efficiency of the reactor. Since the packing density is close to water, it is completely mixed with water during aeration. In addition, each carrier has different biological species inside and outside, and some anaerobic or facultative bacteria grow inside. The environment for microbial growth is Three phases of gas, liquid and solid. The collision and shearing action of the carrier in the water makes the air bubbles finer and increases the utilization rate of oxygen. In addition, each carrier has different types of organisms inside and outside, some anaerobic or facultative bacteria grow inside, and aerobic bacteria outside, so that each carrier is a micro-reactor, so that nitrification and denitrification can exist at the same time , thereby improving the processing effect. The floating carrier moves freely in the reactor with the turning and turning of the mixed liquid, so as to achieve the purpose of sewage treatment.

However, the filler in the existing SSMBBR reactor is in a fluidized state relying on aeration and the lifting effect of water flow. In actual engineering, local filler accumulation is prone to occur, resulting in a longer sewage treatment cycle, lower treatment efficiency, and higher water head loss. large, unstable effluent quality, etc. Therefore, it is very necessary to invent a multi-stage diversion type SSMBBR sewage treatment system and sewage treatment method that can improve the water quality of the effluent and reduce the head loss.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multi-stage diversion type SSMBBR sewage treatment system with high sewage treatment efficiency, small water head loss and good effluent quality.

A multi-stage diversion type SSMBBR sewage treatment system, which includes anaerobic section, denitrification section, aerobic section, filtration section, sedimentation section, deflector A, deflector B, agitator, fan, mixed liquid backflow Pumps, screens, microporous aerators, sludge pumps, control valves and partitions, partitions are set between anaerobic section and denitrification section, denitrification section and aerobic section, filtration section and sedimentation section, The lower part of the partition is fixed at the bottom of the reactor, and the reaction section on both sides of the partition is overflow connected, and the inlet end of the anaerobic section is parallel to the wall of the anaerobic section. On the surface, an agitator is installed at the bottom of the outlet of the anaerobic section, a deflector A is installed at the inlet of the denitrification section, an agitator is installed at the bottom of the denitrification section, and a fan is installed at the inlet of the aerobic section. The aerator is installed horizontally at the bottom of the aerobic section, the microporous aerator is connected to the fan, the outlet end of the aerobic section is arranged diagonally to the inlet end, the bottom of the aerobic section is equipped with a mixed liquid return pump, and the aerobic section is connected to the filter A deflector A is installed between the sections, a partition is provided between the filtration section and the sedimentation section, a screen is provided at the outlet of the filtration section, and a deflector B parallel to the partition is installed at the entrance of the sedimentation section. A sludge pump is installed at the bottom of the section.

Further, the above-mentioned multi-stage diversion type SSMBBR sewage treatment system, wherein said anaerobic section, denitrification section, aerobic section and filter section are added with biological suspension filler. The biological suspension filler is a modified polymer material, which has the advantages of large specific surface area, easy to hang film, not easy to fall off, good hydrophilicity, high biological activity, and good treatment effect; the specific gravity of the biological suspension filler carrier is close to In water, it is 0.95～1.00/cm3 before the film is attached, and it is about 1.1g/cm3 after the film is attached. It is a small cylinder with a diameter of 10mm and a height of 10mm. There is a cross support in the cylinder, and the hollow part of the filler accounts for 0.95 of the entire volume. In a container filled with water and fillers, the volume of water in each filler is 95%; theoretically, the total specific surface area of the filler is defined according to the specific surface area of the biological carrier per unit volume, generally 800m ² / m ³ ; when the biofilm grows inside the carrier, the actual and effectively used specific surface area is about 500m ² /m ³ .

This type of biological filler is conducive to the attachment and growth of microorganisms inside the filler, forming a relatively stable biofilm, and it is easy to form a fluidized state. When the pretreatment requirements are low or the sewage contains a large amount of fibrous substances, for example, primary sedimentation tanks are not used in municipal sewage treatment or when papermaking wastewater containing a large amount of fibers is treated, biological fillers with smaller specific surface areas and larger sizes are used. When there is a good pretreatment or when it is used for nitrification, a biological filler with a large specific surface area is used.

Further, the above-mentioned multi-stage diversion type SSMBBR sewage treatment system, considering the rotation of the filler and the total container volume, the filling ratio of the filler is defined as the proportion of the space occupied by the carrier. In order to achieve the best mixing effect, the filling of the filler Ratio ≤ 0.7.

Further, the above-mentioned multi-stage diversion type SSMBBR sewage treatment system, wherein the outlet end of the mixed liquid return pump is connected to the inlet end of the denitrification section.

Further, the above-mentioned multi-stage diversion type SSMBBR sewage treatment system, wherein the outlet end of the sludge pump is respectively connected to the anaerobic section and the denitrification section, and is also connected to a sludge treatment device.

Further, in the above-mentioned multi-stage diversion type SSMBBR sewage treatment system, control valves are installed on the outlet pipe branches of the mixed liquid return pump and the sludge pump.

The invention also provides a sewage treatment method based on a multi-stage diversion type SSMBBR sewage treatment system with short flow and high treatment efficiency.

A kind of sewage treatment method based on the multistage diversion type SSMBBR sewage treatment system of the present invention, it comprises the following steps:

1. Grille treatment: Domestic sewage contains a large number of suspended solids and floating solids with large particles. The grid is to intercept and remove the above-mentioned substances, and protect the water pump and subsequent processing units;

2. Regulating tank treatment: Due to the uneven incoming water of sewage, the water quality and water quantity of sewage fluctuate greatly. Therefore, only through the regulating tank can the water quality and water quantity entering the biochemical treatment be stable and balanced, providing guarantee for the operation and treatment of subsequent processing units. Therefore, in order to ensure the continuous and stable operation of the sewage station, the effluent treated in step 1 is kept in the regulating tank for 8-12 hours to adjust the water quality and water quantity;

Three, multi-stage diversion type SSMBBR sewage treatment system treatment: the effluent regulated by the regulating tank is subjected to physical, chemical and biological treatment through a multi-stage diversion type SSMBBR sewage treatment system; the multi-stage diversion type SSMBBR sewage treatment The system is the above-mentioned multi-stage diversion type SSMBBR sewage treatment system;

4. Filter cloth filter treatment: the effluent treated in step 3 is filtered through a fixed plate to remove suspended solids in the water; the fixed plate contains fiber filter cloth; the sludge in the filter cloth filter is filtered by the backwash pump Suction into the sludge treatment plant;

5. Ultraviolet sterilizer treatment: the effluent treated in step 4 is sterilized by an ultraviolet sterilizer and then discharged.

Further, above-mentioned a kind of sewage treatment method, wherein said multistage diversion type SSMBBR sewage treatment system processing specifically comprises the following steps:

a. Anaerobic stage treatment: first, through the action of anaerobic bacteria, the polymeric organic matter in the waste water from step 2 is broken and degraded into small molecular substances, which is beneficial to subsequent reactions. At the same time, under anaerobic conditions, facultative bacteria Convert dissolved organic matter into volatile fatty acids, and phosphorus-accumulating bacteria hydrolyze intracellular polyphosphate into ortho-salt, obtain energy from it, absorb easily degradable COD in sewage, and assimilate it into intracellular carbon energy storage polyβ- Hydroxybutyric acid or β-hydroxyvaleric acid, etc.;

In the anaerobic section, by setting deflectors reasonably, the horizontal flow velocity of sewage is reduced, ensuring the sewage moves up and down in the reactor, increasing the residence time, achieving the purpose of exchanging time for space, and greatly saving investment;

b. Treatment in the denitrification section: pass the sewage treated in step a through the denitrification section. A new type of biological suspension filler is set in the denitrification section and an anoxic environment is provided. The mixed liquid in the aerobic section flows back to the denitrification section. Under anoxic conditions, nitrifying bacteria reduce nitrate, release molecular nitrogen or nitrous oxide, and perform denitrification treatment; the effluent mixture in the aerobic section flows back to the denitrification section, so that the system has denitrification capacity and achieves enhanced For the purpose of removing total nitrogen, the denitrification section of the multi-stage diversion type SSMBBR sewage treatment system reduces the horizontal flow velocity of sewage through reasonable setting of deflectors, ensures that the sewage moves up and down in the reactor, increases the residence time, and achieves the following The purpose of exchanging time for space greatly saves investment;

c. Treatment in the aerobic section: the effluent treated in the denitrification section enters the aerobic section, and the aerobic section uses the air force sent by the fan through the pipeline and the microporous air distribution system to form a fluidized state. At the same time, the biological suspension on the surface of the filler The membrane is in contact with dissolved oxygen and organic matter to perform aerobic life respiration, metabolize organic matter, and cells grow. At this time, the reactor is in a completely mixed state, and various physical, chemical, and biochemical indicators reach a dynamic balance; %～200% return to the denitrification section;

The aerobic section adopts a combination of new biological suspension filler and activated sludge, the amount of sludge produced is small, the contact area between sludge and sewage is large, and the time is long, which greatly reduces the pool capacity of the aerobic section, which is about three times that of the ordinary biofilm method. One-half of the pool capacity, thereby reducing the construction investment; at the same time, by rationally setting deflectors in the same reaction section, functional partitions are realized to achieve the best treatment effect;

d. Filtration section treatment: Since there is no air distribution system, new biological suspension fillers are accumulated in the filtration section to form a filter layer, and the sewage obtained in step c is initially separated from mud and water. When the thickness of the filter layer reaches a certain level, it will automatically slide down to the aerobic section. , to realize the recycling of new biological suspension fillers;

e. Treatment in the sedimentation section: the effluent from the filtration section passes through the sedimentation section to further remove suspended solids and separate mud and water. The front section of the sedimentation section of the multi-stage diversion SSMBBR sewage treatment system is equipped with a reaction zone, which can be used for sewage with high phosphorus content. Phosphorus removal agent is added, and 50% to 90% of the separated sludge is returned to the anaerobic section for anaerobic phosphorus removal, and the remaining sludge enters the sludge treatment device for cleaning.

The novel multi-stage diversion type SSMBBR sewage treatment system of the present invention is divided into five reaction zones, which are anaerobic section, denitrification section, aerobic section, filtration section and sedimentation section. A new type of multi-stage diversion type SSMBBR sewage treatment system realizes functional partitioning, optimizes liquid streamlines, reduces water head loss, and prolongs residence time through rationally added deflectors. Compared with traditional MBBR technology, it greatly improves The treatment effect of the reactor. The new multi-stage diversion type SSMBBR sewage treatment system is used to treat rural domestic sewage, and the long-term stability of the effluent water quality is better than the first-level A standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002.

The new multi-stage diversion SSMBBR sewage treatment system uses a new type of biological suspension filler with a specific gravity close to water to be directly added to the aerobic section as the active carrier of microorganisms, and is fluidized by aeration and water flow in the aerobic section. Since the packing density is close to that of water, it is completely mixed with water during aeration, and the environment for microbial growth is gas, liquid and solid. The collision and shearing action of the carrier in the water makes the air bubbles finer and increases the utilization rate of oxygen. In addition, each carrier has different types of organisms inside and outside, some anaerobic or facultative bacteria grow inside, and aerobic bacteria outside, so that each carrier is a micro-reactor, so that nitrification and denitrification can exist at the same time , thereby improving the processing effect. The floating carrier moves freely in the reactor with the turning and turning of the mixed liquid, so as to achieve the purpose of sewage treatment.

The present invention specifically has the following beneficial effects:

1. The multi-stage diversion type SSMBBR sewage treatment system of the present invention realizes functional partitioning by rationally adding deflectors, optimizes the liquid streamline, reduces head loss, and prolongs the residence time. Compared with the traditional MBBR process, it greatly improves The treatment effect of the reactor is improved, and the effluent water quality is stable;

2. The multi-stage diversion type SSMBBR sewage treatment system of the present invention occupies a small area, and only needs 30% of the volume of ordinary oxidation tanks under the same load conditions;

3. In the multi-stage diversion type SSMBBR sewage treatment system of the present invention, microorganisms are attached to the carrier and flow with the water flow without flowing out of the pool, so there is no need for activated sludge backflow or circular backwashing;

4. In the multi-stage diversion type SSMBBR sewage treatment system of the present invention, the biofilm on the carrier continuously grows and falls off to avoid clogging; the organic load is high and the impact load resistance is strong, so the effluent water quality is stable;

5. The sewage treatment method of the present invention has no sludge expansion; small water head loss, low power consumption, simple operation, and easy operation and management;

6. There are various structural forms, such as reinforced concrete structure, carbon steel, stainless steel, glass fiber reinforced plastic and other structures;

7. The sewage treatment method of the present invention can be mass-produced, and is especially suitable for small water volume and heterogeneous sewage of rural township sewage treatment plants. The construction period is short, the production is fast, the appearance is beautiful, and it is compatible with the surrounding environment.

8. The sewage treatment method of the present invention is suitable for renovation and upgrading projects, etc.

Description of drawings

Fig. 1 is the structural representation of multistage diversion type SSMBBR sewage treatment system of the present invention;

In the figure: 1-anaerobic section, 2-denitrification section, 3-aerobic section, 4-filtration section, 5-sedimentation section, 6-deflector A, 7-deflector B, 8-stirrer, 9-fan, 10-mixed liquid return pump, 11-screen, 12-microporous aerator, 13-sludge pump, 14-control valve, 15-baffle.

detailed description

The specific implementation of the present invention will be further described below in conjunction with the examples, and the present invention is not limited to the scope of the examples.

Example 1

1. A multi-stage diversion type SSMBBR sewage treatment system

As shown in Figure 1, a multi-stage diversion type SSMBBR sewage treatment system includes anaerobic section 1, denitrification section 2, aerobic section 3, filtration section 4, sedimentation section 5, deflector A6, diversion Plate B7, agitator 8, fan 9, mixed liquid return pump 10, screen 11, microporous aerator 12, sludge pump 13, control valve 14 and partition 15, anaerobic section 1 and denitrification section 2, A partition 15 is arranged between the denitrification section 2, the aerobic section 3, the filtration section 4 and the precipitation section 5, and the lower part of the partition 15 is fixed on the bottom of the reactor, and the reaction section on both sides of the partition 15 is in overflow communication. The inlet end of the anaerobic section 1 is parallel to the wall surface of the anaerobic section 1, and a deflector A6 is arranged. The inlet end of the anaerobic section 1 is an inclined surface, and the bottom of the outlet end of the anaerobic section 1 is equipped with an agitator 8. Deflector A6 is installed at the inlet of 2, agitator 8 is installed at the bottom of denitrification section 2, fan 9 is installed at the inlet of aerobic section 3, and microporous aerator 12 is horizontally installed at the bottom of aerobic section 3 , the microporous aerator 12 is connected with the fan 9, the outlet end of the aerobic section 3 is arranged diagonally to the inlet end, the bottom of the aerobic section 3 is provided with a mixed liquid return pump 10, and between the aerobic section 3 and the filter section 4 A deflector A6 is installed, a partition 15 is provided between the filter section 4 and the sedimentation section 5, a screen 11 is provided at the outlet of the filtration section 4, and a flow diversion parallel to the partition 15 is provided at the inlet end of the sedimentation section 5 Plate B7, a sludge pump 13 is installed at the bottom of the settling section 5.

Biological suspension fillers are added inside the anaerobic section 1, denitrification section 2, aerobic section 3 and filtration section 4.

The internal filling ratio of the biological suspension filler is less than or equal to 0.7.

The outlet port of the mixed liquid return pump 10 is connected to the inlet port of the denitrification section 2 .

The outlet end of the sludge pump 13 is connected with an anaerobic section 1, a denitrification section 2, and also connected with a sludge treatment device.

Control valves 14 are installed on the outlet pipe branches of the mixed liquid return pump 10 and the sludge pump 13 .

The work of the multi-stage diversion SSMBBR sewage treatment system specifically includes the following steps:

1. The anaerobic section 1 is added with biological suspension fillers to provide an anaerobic environment. The deflector A6 is set at the entrance of the anaerobic section 1 to reduce the horizontal flow velocity of the sewage, ensure that the sewage moves up and down in the reactor, and increase the residence time , and at the same time, the deflector A6 guides the sewage to the agitator 8 installed at the bottom of the anaerobic section 1, so that the sewage can fully contact and react with the biological suspension filler;

2. The denitrification section 2 and the anaerobic section 1 are separated by a partition 15, and the denitrification section 2 and the anaerobic section 1 are overflowed and communicated at the upper part of the partition 15, and the bottom of the entrance of the denitrification section 2 is an inclined surface, and the denitrification section 2 The entrance of the nitrification section 2 is parallel to the wall of the denitrification section 2, and a deflector A6 is arranged, and at the same time, the deflector A6 guides the sewage reacted in the anaerobic section 1 to the agitator 8 installed at the bottom of the denitrification section 2, Make the sewage fully contact and react with the biological suspension filler;

3. The aerobic section 3 and the denitrification section 2 are separated by a partition 15, and the sewage in the denitrification section 2 on the upper part of the partition 15 flows to the aerobic section 3 through overflow, and the aerobic section 3 is added There are biological suspension fillers, a fan 9 is arranged on the aerobic section 3, a microporous aerator 12 is installed at the bottom of the aerobic section 3, the outlet end of the fan 9 is connected with the microporous aerator 12, and the air supplied by the fan 9 is from The surface holes of the microporous aerator 12 are sprayed out, and the air slowly rises from the bottom of the aerobic section 3 to fully contact the aerobic microorganisms in the sewage. The pump outlet of the reflux pump 10 is connected to the inlet of the denitrification section 2, so that the mixture deposited at the bottom of the aerobic section 3 is pumped back into the denitrification section 2 for denitrification reaction to ensure the final removal of nitrogen in the sewage;

4. The filter section 4 and the aerobic section 3 are separated by a deflector A6. The filter section 4 is filled with biological suspension filler. The aerobic section 3 and the filter section 4 are connected through the bottom, and the bottom of the filter section 4 is an inclined surface. , large particles can slide to the bottom of the aerobic section 3 along the inclined surface, and are pumped back into the denitrification section 2 by the mixed liquid return pump 10, and a screen 11 is provided at the outlet of the filter section 4, and the sewage after the reaction can be Overflow to the sedimentation section 5 through the screen 11;

5. The sedimentation section 5 and the filtration section 4 are separated by a partition 15. The treated sewage in the filtration section 4 flows into the sedimentation section 5 through overflow. The entrance of the precipitation section 5 is provided with a guide plate B7, and the guide plate The bottom of the sedimentation section 5 below B7 is an inclined surface. The sewage is guided by the deflector B7 and hits the inclined surface, so that the kinetic energy of the sludge or large particles in the sewage is reduced and rolled down along the inclined surface. The sludge pump 13 at the bottom of the section 5 sucks away the sludge deposited at the bottom of the sedimentation section 5, and the outlet of the sludge pump 13 is diverted through the pipeline to discharge a part of the sludge into the sludge treatment device, and 50% to 90% of it is returned to the anaerobic In section 1, the returned sewage is circulated and purified again in the reactor, and a control valve 14 is installed on each branched pipeline to adjust the flow of sewage in the pipeline, and the sewage treated in the sedimentation section 5 overflows from the upper part of the sedimentation section 5 After the outflow enters the filter cloth filter, it is finally sterilized by ultraviolet light to complete the domestic sewage treatment.

2. Sewage treatment process

The concentration of sewage COD is 350mg/L, the concentration of BOD ₅ is 180mg/L, the concentration of SS is 200mg/L, the concentration of TN is 40mg/L, the concentration of ammonia nitrogen is 30mg/L, and the concentration of total phosphorus is 4mg/L L, Rural domestic sewage with a pH value of 6 to 9, after the grid treatment, the large particle suspended matter and floating matter are intercepted, the sewage enters the regulating tank, and after staying in the regulating pond, the sewage is sent to the above-mentioned multi-stage guide In the flow-type SSMBBR sewage treatment system, anaerobic treatment, denitrification treatment, aerobic treatment, filtration section treatment and sedimentation section treatment are carried out in sequence to obtain sewage with various physical, chemical and biochemical indicators. Finally, a multi-stage The sewage treated by the diversion SSMBBR sewage treatment system is treated by filter cloth filter and ultraviolet disinfection treatment, and finally all indicators are qualified and can be discharged safely. The concentration of COD in the various indicators of the effluent is 41mg/L, and the removal rate is 88.3%; the concentration of BOD ₅ is 7mg/L, and the removal rate is 96.1%; the concentration of SS is 5mg/L, and the removal rate is 97.5%; the concentration of TN is 11mg/L, and the removal rate is 72.5%; the concentration of ammonia nitrogen is 4mg/L, the removal rate is 86.7%; the concentration of total phosphorus is 0.3mg/L, the removal rate is 92.5%; the pH value is 7.9, and the effluent quality fully meets the "Discharge Standards for Sewage Pollutants of Urban Sewage Treatment Plants" (GB18918-2002 ) Tier 1 A emission standard.

Example 2

One, a kind of multistage diversion type SSMBBR sewage treatment system (same as embodiment 1)

2. Sewage treatment process

The concentration of sewage COD is 320mg/L, the concentration of BOD ₅ is 170mg/L, the concentration of SS is 180mg/L, the concentration of TN is 35mg/L, the concentration of ammonia nitrogen is 25mg/L, and the concentration of total phosphorus is 4mg/L L, Rural domestic sewage with a pH value of 6 to 9, after the grid treatment, the large particle suspended matter and floating matter are intercepted, the sewage enters the regulating tank, and after staying in the regulating pond, the sewage is sent to the above-mentioned multi-stage guide In the flow-type SSMBBR sewage treatment system, anaerobic treatment, denitrification treatment, aerobic treatment, filtration section treatment and sedimentation section treatment are carried out in sequence to obtain sewage with various physical, chemical and biochemical indicators. Finally, a multi-stage The sewage treated by the diversion SSMBBR sewage treatment system is treated with filter cloth filter and ultraviolet disinfection treatment, and finally all indicators are qualified and can be discharged safely. The concentration of COD in the various indicators of the effluent is 38mg/L, and the removal rate is 88.1%; the concentration of BOD ₅ is 7mg/L, and the removal rate is 95.9%; the concentration of SS is 6mg/L, and the removal rate is 96.7%; the concentration of TN is 12mg/L, and the removal rate is 65.7%; the concentration of ammonia nitrogen is 3mg/L, the removal rate is 88%; the concentration of total phosphorus is 0.2mg/L, the removal rate is 95%; the pH value is 7.6, and the effluent quality fully meets the "Discharge Standards for Sewage Pollutants of Urban Sewage Treatment Plants" (GB18918-2002 ) Tier 1 A emission standard.

Example 3

One, a kind of multistage diversion type SSMBBR sewage treatment system (same as embodiment 1)

2. Sewage treatment process

The concentration of sewage COD is 280mg/L, the concentration of BOD ₅ is 150mg/L, the concentration of SS is 180mg/L, the concentration of TN is 35mg/L, the concentration of ammonia nitrogen is 25mg/L, and the concentration of total phosphorus is 4mg/L L, Rural domestic sewage with a pH value of 6 to 9, after the grid treatment, the large particle suspended matter and floating matter are intercepted, the sewage enters the regulating tank, and after staying in the regulating pond, the sewage is sent to the above-mentioned multi-stage guide In the flow-type SSMBBR sewage treatment system, anaerobic treatment, denitrification treatment, aerobic treatment, filtration section treatment and sedimentation section treatment are carried out in sequence to obtain sewage with various physical, chemical and biochemical indicators. Finally, a multi-stage The sewage treated by the diversion SSMBBR sewage treatment system is treated with filter cloth filter and ultraviolet disinfection treatment, and finally all indicators are qualified and can be discharged safely. The concentration of COD in the various indicators of the effluent is 30mg/L, and the removal rate is 89.3%; the concentration of BOD ₅ is 6mg/L, and the removal rate is 95.9%; the concentration of SS is 5mg/L, and the removal rate is 96.7%; the concentration of TN is 9mg/L, and the removal rate is 74.3%; the concentration of ammonia nitrogen is 3mg/L, the removal rate is 88%; the concentration of total phosphorus is 0.3mg/L, the removal rate is 92.5%; the pH value is 7.8, and the effluent quality fully meets the "Discharge Standards for Sewage Pollutants of Urban Sewage Treatment Plants" (GB18918-2002 ) Tier 1 A emission standard.

Claims (8)

1. A multi-stage diversion type SSMBBR sewage treatment system is characterized in that: it includes anaerobic section (1), denitrification section (2), aerobic section (3), filtration section (4), sedimentation section ( 5), deflector A (6), deflector B (7), agitator (8), fan (9), mixed liquid return pump (10), screen (11), microporous aerator ( 12), sludge pump (13), control valve (14) and partition (15), anaerobic section (1) and denitrification section (2), denitrification section (2) and aerobic section (3), A partition (15) is arranged between the filtration section (4) and the precipitation section (5), and the lower part of the partition (15) is fixed at the bottom of the reactor, and the reaction section on both sides of the partition (15) is overflowed and communicated. The inlet end of the anaerobic section (1) is parallel to the wall surface of the anaerobic section (1), and a deflector A (6) is arranged, the inlet end of the anaerobic section (1) is an inclined surface, and the outlet of the anaerobic section (1) The agitator (8) is installed at the bottom of the denitrification section (2), the deflector A (6) is installed at the inlet end of the denitrification section (2), the agitator (8) is installed at the bottom of the denitrification section (2), and the aerobic section (3 ) is provided with a blower fan (9), the microporous aerator (12) is horizontally arranged at the bottom of the aerobic section (3), the microporous aerator (12) is connected with the fan (9), and the aerobic section ( 3) The outlet end and the inlet end are arranged diagonally, the bottom of the aerobic section (3) is provided with a mixed liquid return pump (10), and a deflector A is installed between the aerobic section (3) and the filter section (4) (6), a partition (15) is set between the filter section (4) and the precipitation section (5), a screen (11) is provided at the outlet of the filter section (4), and a screen (11) is provided at the inlet of the precipitation section (5). There is a deflector B (7) parallel to the dividing plate (15), and a sludge pump (13) is installed at the bottom of the settling section (5). 2. A multi-stage diversion type SSMBBR sewage treatment system according to claim 1, characterized in that: the anaerobic section (1), denitrification section (2), aerobic section (3) and filtration Section (4) is added with biological suspension filler inside. 3. A multi-stage diversion type SSMBBR sewage treatment system according to claim 1, characterized in that: the internal filling ratio of the biological suspension filler is ≤0.7. 4. A multi-stage diversion type SSMBBR sewage treatment system according to claim 1, characterized in that: the outlet end of the mixed liquid return pump (10) is connected to the inlet end of the denitrification section (2). 5. A multi-stage diversion type SSMBBR sewage treatment system according to claim 1, characterized in that: the outlet end of the sludge pump (13) is connected with an anaerobic section (1), a denitrification section ( 2), also connected with sludge treatment device. 6. A multi-stage diversion type SSMBBR sewage treatment system according to claim 1, characterized in that: the outlet pipe branches of the mixed liquid return pump (10) and the sludge pump (13) are equipped with control valve (14). 7. A sewage treatment method, is characterized in that, comprises the following steps: 1. Grille treatment: pass the sewage through the grille to trap large particles of debris; 2. Regulating tank treatment: the effluent treated in step 1 stays in the regulating tank for 8-12 hours to adjust the water quality and water quantity; Three, multi-stage diversion type SSMBBR sewage treatment system treatment: the effluent regulated by the regulating tank is subjected to physical, chemical and biological treatment through a multi-stage diversion type SSMBBR sewage treatment system; the multi-stage diversion type SSMBBR sewage treatment The system is the multi-stage diversion type SSMBBR sewage treatment system described in any one of claims 1 to 6; 4. Filter cloth filter treatment: the effluent treated in step 3 is filtered through a fixed plate to remove suspended solids in the water; the fixed plate contains fiber filter cloth; 5. Ultraviolet sterilizer treatment: the effluent treated in step 4 is sterilized by an ultraviolet sterilizer and then discharged. 8. A kind of sewage treatment method according to claim 7, is characterized in that, described step 3 specifically comprises the following steps: a. Anaerobic stage treatment: first, through the action of anaerobic bacteria, the polymeric organic matter in the wastewater coming in from step 2 is broken and degraded into small molecular substances. Converted into volatile fatty acids, phosphorus-accumulating bacteria hydrolyze intracellular polyphosphates into ortho-acid salts, and obtain energy from them; b. Denitrification section treatment: the sewage treated in step a passes through the denitrification section, and the denitrification bacteria in the denitrification section reduce nitrate under anoxic conditions, release molecular nitrogen or nitrous oxide, and perform denitrification deal with; c. Treatment in the aerobic section: the effluent treated in the denitrification section enters the aerobic section, and the aerobic section uses the air force sent by the fan through the pipeline and the microporous air distribution system to form a fluidized state. At the same time, the biological suspension on the surface of the filler The membrane is in contact with dissolved oxygen and organic matter to carry out aerobic life respiration, metabolize organic matter, and cells grow; 100% to 200% of the water mixture from the aerobic section is returned to the denitrification section; d. Filtration section treatment: the new biological suspension filler forms a filter layer in the filtration section, and the sewage obtained in step c is separated from mud and water; e. Treatment in the sedimentation section: the effluent from the filtration section passes through the sedimentation section to further remove suspended solids and carry out mud-water separation. 50% to 90% of the separated sludge is returned to the anaerobic section for anaerobic phosphorus removal, and the remaining sludge enters the sludge The mud treatment device is cleaned, that is to say.