CN206886902U - A kind of biological cycle method sewage disposal system - Google Patents

Abstract

A kind of biological cycle method sewage disposal system, including the hyperfine filtration treatment unit of sewage, regulation mixed processing unit, sludge drying dewatering unit, anoxic adsorption treatment unit, UBF efficient anaerobics processing unit, BAF BAFs unit, sbr reactor pool unit, MBBR biomembrance process processing unit, nitrification liquid refluxing portion, dephosphorization decontamination system unit, filtering clear water pool unit, derivative land use and carbon sources recycling utilize part etc..The technology combinations such as the hyperfine filtering of sewage, sewage are adjusted mixed processing by the system, the absorption of sewage anoxic, wastewater efficient Anaerobic Treatment, the processing of sewage low energy consumption biomembrance process, derivative land use, carbon sources recycling utilize, low energy consumption, low-carbon-source, take up an area small, small investment, running cost is low, intelligence degree is high, maintenance management is easy, and be better than after the dirty water decontamination handles《Urban wastewater treatment firm pollutant emission standard》（GB18918‑2002）Primary standard A standards.

Description

A kind of biological circulation sewage treatment system

technical field

The utility model relates to the field of environmental protection, in particular to the technology for treating domestic sewage in cities and towns.

Background technique

On April 3, 1914, two young British sanitary engineers, Edward Arden and William Lockett, published the article "Sewage Oxidation Test Without Filter", which first proposed the concept of "activated sludge", which marked the activated sludge. Law was officially born. After the birth of the activated sludge method, researches and practical construction of sewage treatment plants began rapidly around the world. In 1923, China's first activated sludge sewage treatment plant was built in the North District of Shanghai, with a daily treatment capacity of 3,500 cubic meters. In the following years, sewage treatment plants in the eastern and western districts of Shanghai were also built, with a daily treatment capacity of 17,000 cubic meters and 15,000 cubic meters respectively.

Today, a hundred years later, there are at least 50,000 activated sludge sewage treatment plants in operation around the world, treating at least 500 million cubic meters of sewage every day. It is no exaggeration to say that a world without activated sludge would be unimaginable. So, why does the activated sludge method continue to serve mankind for hundreds of years.

Firstly, this can be attributed to the "simpleness" of the activated sludge process. An aeration tank, a sedimentation tank, and backflow can form an activated sludge system to complete the basic functions of sewage treatment. Simple means reliable, means universal, and means low processing costs. Secondly, the "powerful function" of the activated sludge method is also an important reason. In particular, the activated sludge method is a biotechnology derived from nature, which may be the root cause of its strong vitality.

While affirming the great historical role of the activated sludge process, we must see its two increasingly prominent defects in the new situation:

One is that the activated sludge process requires a lot of power consumption and is an important source of carbon emissions. According to the latest statistics, the sewage treatment in the United States consumed a total of 30.2 billion kilowatt-hours of electricity in 2011 (only including sewage treatment and regeneration, excluding in-situ treatment, sewage collection and reclaimed water transmission and distribution), accounting for 30% of the total electricity consumption of the whole society that year. 0.8%. As an industrialized country, Japan's power consumption for sewage treatment also accounts for 0.8% of the total power consumption of the whole society. At present, the actual sewage treatment rate and treatment standards in my country are relatively low, and the power consumption of sewage treatment accounts for a relatively low proportion of the total power consumption of the whole society. The high power consumption of sewage treatment, in addition to increasing operating costs, also makes it an important source of carbon emissions.

Second, the activated sludge method leads to the generation of a large amount of biological sludge. The total dry weight of sludge produced by the sewage treatment industry in the United States is 7.5 million tons per year, 10 million tons in Europe, 6 million tons in China, and 30 million tons in the world, which is converted into dewatered sludge with a moisture content of 80%. About 1.5 million tons.

40% to 60% of these sludges are biological sludge composed of biological bacteria, which is a special hydration structure composed of living cells and water. Because a large amount of water and organic matter are "wrapped" in the cells, the dehydration performance of the sludge is poor, and it is difficult to perform a more thorough stabilization treatment, which has become a "cumbersome" for sewage treatment. In order to improve the sludge stabilization effect, methods such as thermal hydrolysis, ultrasonic waves, microwaves, focused electric pulses, and biological enzyme hydrolysis can be used to pretreat the sludge to rupture the cell walls of living cells, release the water and organic matter in them, and improve dehydration. Performance and stability, but the construction and operation costs of these facilities are relatively high, and not many have actually been built.

The activated sludge method realizes the function of sewage treatment at the cost of high energy consumption, which is used to provide oxygen for microorganisms to decompose organic matter in sewage, and these organic matters themselves are energy carriers. Therefore, the activated sludge method is vividly described as a technology of "destroying energy with energy", and it is also a technology of "reducing pollutants in wastewater and increasing emissions of greenhouse gases".

Wang Hongchen, deputy dean of the School of Environment, Renmin University of China, said at the "Eighth Environmental Technology Forum": Although the activated sludge method will continue to serve human beings, we have reason to believe that it will not continue to be the next 100 years. mainstream technology.

The main function of sewage treatment is to remove organic matter and inorganic nutrients. The former leads to black and odorous water bodies, while the latter is the root cause of eutrophication. The activated sludge method decomposes about 50% of organic matter into water and carbon dioxide, and the other part is synthesized into biological bacteria. While "destroying energy with energy", a large amount of biological sludge that is difficult to treat is produced.

Therefore, it is natural for people to hope that sewage treatment should firstly carry out anaerobic energy production or anaerobic energy production after separation of organic matter, rather than aerobic oxidative decomposition and synthesis. If the organics are separated or treated first, there will be inorganic nutrients left in the sewage to be treated. Inorganic phosphorus can usually be efficiently removed by biological or chemical processes, and there are no technical barriers. The problem mainly focuses on the removal of inorganic nitrogen. Ammonia nitrogen is usually converted into nitrogen gas through nitrification and denitrification process. The nitrification process requires a lot of energy consumption, so people have been exploring low energy consumption nitrification process. In addition, the denitrification process needs to consume a large amount of carbon sources, and if the organic matter is first separated, denitrification cannot proceed.

If there is a denitrification technology with low energy consumption and low carbon source requirements, the sewage treatment process will undergo major changes: replace the aerobic treatment with high energy consumption with high-energy anaerobic treatment, firstly remove organic matter and recover energy, and then detoxify inorganic nitrogen Low energy removal. The discovery, research and practice of the anammox phenomenon may make this vision a reality.

Professor Wang Hongchen said that until now, it is believed that there are three directions for the improvement of activated sludge that are the most important. One is biofilm-activated sludge method (MBBR, IFAS), the second is membrane bioreactor (MBR), and the third is aerobic granular sludge (AGS). These three processes have greatly improved the efficiency of activated sludge in essence, but we must see that none of them are essential innovations. They increase energy consumption to varying degrees while improving efficiency. The future sewage treatment process that may replace the activated sludge method is the carbon-nitrogen two-stage method: the organic matter in the sewage must be separated first, and the separated sludge will produce methane through anaerobic digestion, or the sewage will be directly anaerobic. After separation, the sewage containing ammonia nitrogen is denitrified by mainstream anaerobic ammonium oxidation. According to theoretical estimates, using the activated sludge method to treat 1 population equivalent of pollutants requires 44 watt-hours of electricity, while using the above-mentioned carbon and nitrogen two-stage method to treat 1 population equivalent of pollutants will generate 24 watt-hours of energy, so that the sewage The treatment plant has truly become an "energy plant", and the sludge output is only 1/4 of that of the activated sludge process.

Up to now, the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) has been promulgated and implemented for nearly 15 years. This 2002 standard may be replaced by new standards at any time. With the continuous improvement of environmental protection requirements, The new standard will be more stringent than the old standard.

For this reason, it is imperative to develop a biological cycle method with high effluent quality, low energy consumption, low carbon source, high denitrification, and sustainable nutrient removal technology as an innovative alternative to the activated sludge process.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the existing activated sludge process for sewage treatment, and provide a sewage treatment system with a biological circulation method, which combines the new technology of ultra-fine filtration of sewage, the new technology of sewage regulation and mixed treatment, the new technology of sewage anoxic adsorption, New technology for high-efficiency anaerobic treatment of sewage, new technology for sewage low-energy biofilm treatment, new technology for sludge self-reduction, new technology for total phosphorus recycling, new technology for sewage disinfection treatment, new technology for derivative land use, and new technology for carbon source recycling etc. organically combined to achieve low energy consumption, low carbon sources, small footprint, low investment, low operating costs, high degree of intelligence, easy maintenance and management, and sewage purification treatment is better than the "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002) Class A standard A standard: pH (dimensionless) 6 ~ 9, suspended solids (SS) ≤ 5mg/L, chemical oxygen demand (COD) ≤ 25mg/L, five-day biochemical oxygen demand (BOD ₅ ) ≤6mg/L, ammonia nitrogen (NH ₃ -N)≤1.0mg/L, total phosphorus (calculated as P)≤0.1mg/L, total nitrogen (calculated as N)≤3.0mg/L.

The technical scheme of the utility model is as follows:

A sewage treatment system of biological circulation method, including a sewage ultrafine filtration treatment unit connected by pipelines, an adjusted mixing treatment unit, anoxic adsorption treatment unit, sludge drying and dehydration unit, improved UBF high-efficiency anaerobic treatment unit, improved Type BAF aerated biological filter unit, improved SBR reaction tank unit, improved MBBR biofilm treatment unit, phosphorus removal and disinfection system unit and filtered water tank.

The sewage inlet pipe is connected to the sewage ultra-fine filtration treatment unit, and the sewage treated by the sewage ultra-fine filtration treatment unit is connected to the adjustment mixing treatment unit.

The mixed sewage treated by the adjusted mixed treatment unit is connected to the anoxic adsorption treatment unit.

The sewage treated by the anoxic adsorption treatment unit is connected to the improved UBF high-efficiency anaerobic treatment unit, and the excess sludge generated by the treatment is discharged into the sludge drying and dehydration unit.

The sludge drying and dehydration unit is arranged above the conditioning and mixing treatment unit, and the sludge concentrate is directly discharged into the conditioning and mixing treatment unit.

The effluent of the improved UBF high-efficiency anaerobic treatment unit enters the mixed solution water distribution area, and is mixed with the sewage of the improved SBR reaction tank and divided into two paths, one path is connected to the improved BAF aerated biological filter unit, and the other path is connected back to the gap. Oxygen adsorption treatment unit, the remaining high-concentration granular anaerobic sludge produced by the improved UBF high-efficiency anaerobic treatment unit is discharged into the regulated mixed treatment unit through the anaerobic sludge discharge pipe connected to the discharge inlet of the regulated mixed treatment unit .

The improved BAF biological aerated filter unit is located above the improved SBR reaction tank unit, and the water treated by the improved BAF biological aerated filter unit enters the improved SBR reaction tank unit through the jet flow device, and the improved SBR reaction tank unit The mixed liquid inside is lifted by the mixed liquid circulation lifting pump and transported back to the improved BAF aerated biological filter unit, so that the mixed liquid is intermittently circulated between the improved BAF aerated biological filter and the improved SBR reaction tank, where the sewage passes through the biological Membrane method and activated sludge method are cyclically treated, and the sewage treated by the SBR reaction tank unit is connected to the first-level improved MBBR biofilm method treatment unit;

The sewage treated by the first-level improved MBBR biofilm treatment unit is connected to the second-level improved MBBR biofilm treatment unit, and the nitrification liquid generated in the treatment of the first-level improved MBBR biofilm treatment unit passes through the nitrification liquid at the bottom The hydrostatic pressure discharge pipe is connected to the discharge inlet of the regulating mixing treatment unit, and the discharge enters the regulating mixing treatment unit;

The sewage treated by the secondary improved MBBR biofilm treatment unit is connected to the phosphorus removal and disinfection system unit.

The phosphorus removal and disinfection system unit has chemical phosphorus removal dosing equipment and disinfectant dosing equipment, and the remaining phosphate in the sewage reacts with the iron salt or aluminum salt delivered by the chemical phosphorus removal dosing equipment to generate PO ₄ ^3- Insoluble compounds, the phosphorus-containing sludge deposited by the phosphorus removal and disinfection system unit enters the bottom of the secondary improved MBBR biofilm treatment unit, and is directly discharged into the sludge drying and dehydration unit through the hydrostatic pressure discharge pipe of the phosphorus-containing sludge at the bottom. The clean water treated by the phosphorus removal and disinfection system unit is contacted with the disinfectant delivered by the disinfectant dosing equipment, and then connected to the filtered clean water pool after disinfection.

The filtered clean water pool is connected with a standard-reaching external discharge pipe, which discharges the standard-reaching water into the natural water body or reuses, and is also connected with an excess-standard sewage return discharge pipe, which is connected back to the discharge inlet of the regulating mixing treatment unit, and discharged into the regulating The pool is processed again.

Further, the sewage ultra-fine filtration treatment unit includes, from front to back, a grid pool, a climbing type ultra-fine grid machine, grid residue receiving and conveying treatment equipment, grid residue pool and intelligent equipment control system; a crawler is installed in the grid pool The end of the slope-type ultra-fine grid machine and the climbing-type ultra-fine grid machine are connected to the grid slag receiving and conveying equipment, and the conveying end of the grid slag receiving, conveying and processing equipment is connected to the grid slag pool at the rear end.

The sewage inlet pipe, grid tank, grid residue receiving and conveying treatment equipment and intelligent equipment control system are realized by known technology.

The climbing type ultra-fine grid machine equipment can remove organic and inorganic solid waste > 1mm, the purpose is to avoid the subsequent blockage of the water pump and cause the sewage treatment facility to stop operating, prolong the life of the lifting pump, reduce equipment maintenance and reduce The organic pollution load of the subsequent treatment process.

The grid pool has the function of removing larger solid matter and SS in domestic sewage.

Further, the regulating mixed treatment unit includes a regulating pool and a sewage constant lifting pump; the regulating pool is located below the sewage ultra-fine filtration treatment unit, and the sewage treated by the climbing ultra-fine grid machine enters the regulating pool, and the regulating pool has denitrification and denitrification The function of the area, the pool body is provided with a discharge inlet, a sewage constant volume lift pump is installed in the pool, and the water delivery pipe of the sewage constant volume lift pump is an anoxic adsorption treatment unit.

The discharge inlet of the adjustment mixed treatment unit includes the discharge inlet of nitrification liquid, the emergency discharge inlet of excess sewage, the discharge inlet of filter backwash wastewater, and the sludge discharge inlet of the subsequent treatment system.

The regulating tank, sewage constant lifting pump, discharge inlet and intelligent equipment control system are realized by known technology.

The flow rate of the sewage constant lifting pump needs to be determined according to the sewage treatment capacity (m ³ /h), the nitrification liquid return flow rate (m ³ /h) and other sewage (excessive sewage, filter backwash wastewater, system sludge) , the utility model optimizes the optimal flow rate of the sewage constant lift pump to be the sum of the sewage treatment capacity Q (m ³ /h) and the nitrification liquid return flow rate 2Q (m ³ /h).

The sewage constant lifting pump is preferably a homogenizing sewage pump.

The domestic sewage is finely filtered by the climbing ultra-fine screen machine and then enters the regulating tank, and the nitrification liquid discharged from the first-level improved MBBR tank, and other sewage or sludge discharged from time to time (excessive sewage, filter backwash wastewater) , follow-up treatment system sludge, and the concentrated solution after dehydration in the sludge drying tank) are mixed to complete a part of denitrification and denitrification and reduce part of COD. The mechanism is as follows:

After domestic sewage, nitrifying liquid and other sewage are mixed in the regulating tank, the dissolved oxygen (DO) in the sewage is 0.2mg/L～0.5mg/L, and the mixed sewage is under the condition of anoxic and there is an external carbon source to provide energy (Domestic sewage provides carbon source), and denitrifying bacteria reduce nitrate nitrogen and nitrite nitrogen to nitrogen and escape.

Phosphorus-containing fine sludge in nitrification liquid and other sewage is discharged into the adjustment tank along with the sewage or mixed liquid. Since the DO in the sewage in the adjustment tank is 0.2mg/L-0.5mg/L, most of the phosphorus will be solidified in the fine sludge. The adjustment pool is also the collection place for the total phosphorus in the subsequent treatment process system.

The regulating pool accepts the sewage in the subsequent process (nitrification liquid, sewage exceeding the standard, backwashing waste water of the filter and concentrated liquid after dehydration of the sludge drying pool) in the subsequent process under the condition of no energy consumption.

The adjustment pool has the functions of water volume peak regulation, water quality regulation, total phosphorus collection and denitrification and COD removal.

The sludge drying and dewatering unit is composed of grid residue tank, sludge drying tank, filter plate, filter material, filter cloth, pressure balance pipe, grid residue discharge pipe and excess sludge discharge pipe, and is realized by known technology.

The top of the sludge drying tank is 1.5m above the water level in the anoxic tank, the improved UBF high-efficiency anaerobic tank and the secondary improved MBBR tank, meeting the requirements of the anoxic tank, the high-efficiency anaerobic tank, and the secondary improved MBBR tank. Phosphorus-containing sludge or excess sludge is transported to the sludge drying tank through hydrostatic pressure, which reduces the setting of sludge pumps and reduces the energy consumption of sewage treatment operations.

The grid tank, grid residue tank and sludge drying tank are located on the top or beside the regulating tank, and the sewage is finely filtered by the climbing ultra-fine grid machine and directly flows into the regulating tank, and the grid residue is transported to the regulating tank by a screw conveyor. The grid residue pool is also used for safe disposal, and the concentrated liquid after the sludge is dehydrated in the sludge drying tank directly flows into the regulating tank, and the dried sludge is safely disposed of. The purpose is to save land, investment and energy consumption.

The tops of the grid pool, regulating pool, and sludge drying pool are on the same plane, the regulating pool can be covered and closed, and a sun shed can be set up on the top of the grid pool and sludge drying pool to prevent rainwater from entering the sewage The mud drying tank causes the sludge to fail to dry.

Further, the anoxic adsorption treatment unit includes an anoxic adsorption tank, a high-concentration granular and aerobic sludge layer, a water distributor, a decanting tank, a sludge overrun alarm, a DO dissolved oxygen meter, and a hydrostatic pressure discharge of excess sludge The anoxic adsorption tank is equipped with a high-concentration granular and oxygenated sludge layer, and a water distributor is installed at the bottom. The pressurized sewage passes through the high-concentration granular and oxygenated sludge layer through the water distributor to stir the sludge. An anoxic fluidized bed is formed; a sludge over-limit alarm and a DO dissolved oxygen meter are also installed in the anoxic adsorption pool; The decanting tank is connected to the UBF high-efficiency anaerobic treatment unit. The anoxic adsorption treatment unit is composed of anoxic adsorption pool, high-concentration granular facultative oxygen sludge, water distributor, decanting tank, sludge overrun alarm, and sludge hydrostatic pressure discharge pipe.

After the domestic sewage is adjusted and mixed, the mixed sewage that has not been completely denitrified is lifted into the anoxic adsorption tank by a constant lift pump, mixed with the nitrifying liquid returned from the improved SBR reaction tank, and denitrified again in the anoxic adsorption tank. nitrogen.

The DO dissolved oxygen meter in the anoxic adsorption tank is used to adjust the sewage return flow delivered by the mixed liquid circulation lift pump in the improved SBR reaction tank, so as to control the dissolved oxygen (DO) in the anoxic adsorption tank at 0.2mg/L～0.5mg/L between.

There is a high concentration of granular facultative oxygen sludge in the anoxic adsorption tank. The sludge has a large surface area (between 2,000 and 10,000m ² /m of mixed liquid), and there is a layer of polysaccharides on the surface. Suspended and colloidal sludge in the sewage Substances are removed by flocculation and adsorption. After the colloidal macromolecular organic matter is adsorbed, it is first decomposed into small molecular substances by hydrolysis bacteria, and then these small molecules and dissolved organic matter provide nutrients for the high-concentration microorganisms in the sludge to complete the purification of sewage.

The nitrifying liquid that has not been completely denitrified is treated in the adjustment tank and then enters the anoxic adsorption tank for treatment. Under the action of denitrifying bacteria in the anoxic adsorption tank, the nitrate nitrogen and nitrite nitrogen in the sewage are reduced to nitrogen and escape. Completed the removal of total nitrogen in the sewage and realized the pre-denitrification of the system.

The dissolved oxygen DO in the sewage and high-concentration granular facultative sludge in the anoxic adsorption tank is maintained between 0.2mg/L and 0.5mg/L, and the total phosphorus lifted from the adjustment tank accumulates in the high-concentration granular facultative sludge. In the sludge, the effective accumulation of total phosphorus in the domestic sewage treatment system is completed. A small amount of total phosphorus is used as the nutrient required for sewage treatment, and most of it is stored in the sludge in the anoxic adsorption tank. As the height of the sludge layer in the anoxic adsorption tank increases, it is discharged into the sludge drying tank through the remaining sludge discharge pipe to complete the removal of total phosphorus.

The sewage lifting pump in the adjustment tank supplies constant water, and the water distributor realizes balanced water distribution in the anoxic adsorption tank, and the water receiving tank balances decanting water. The reliable rising flow rate ensures that there is no short flow of water out of the anoxic adsorption tank, and the loss of microorganisms in the anoxic adsorption tank is less, reducing The load on the subsequent treatment process system is reduced.

The anoxic adsorption pool has the functions of adsorption hydrolysis, denitrification and denitrification, and the removal of a large amount of COD, BOD, and SS, and accumulates total phosphorus, which is then discharged out of the sewage treatment system along with the remaining sludge to realize the removal of total phosphorus.

Further, the improved UBF high-efficiency anaerobic treatment unit includes anaerobic water distribution area, improved UBF high-efficiency anaerobic tank, high-concentration granular anaerobic sludge, water distributor, high-density biological filler, decanting tank, anaerobic sludge discharge Pipe, biogas collection cabinet; the water inlet of the anaerobic water distribution area is connected with the decanting tank on the upper part of the anoxic adsorption treatment unit, and the improved UBF high-efficiency anaerobic pool is composed of one or more grids, and high-density biological filler is arranged in the pool, and Install the water distributor, the water distributor is connected to the water outlet of the anaerobic water distribution area, the upper part of the improved UBF high-efficiency anaerobic tank is equipped with a decanter tank connected to the improved BAF aerated biological filter unit, the bottom is equipped with anaerobic sludge discharge pipes, and the top is also Set biogas collection cabinet;

The improved UBF high-efficiency anaerobic tank water distributor is composed of a water inlet pipe, a central pipe and a reflection plate.

The packing support is composed of a main support beam, a secondary support beam and a corrosion-resistant packing support tube.

The high-density biological filler is preferably fiber bundle filter material or other biological filler with a large specific surface area, and the filler area accounts for 30% to 80% of the pool volume.

The decanting tank is composed of a decanting plate, a water collecting tank and an outlet pipe.

The anaerobic sludge discharge pipe is realized by known technology. The anaerobic sludge in the improved UBF high-efficiency anaerobic tank is regularly discharged out of the tank through the hydrostatic pressure sludge discharge pipe and enters the sludge dry tank to complete the treatment of anaerobic sludge.

The biogas collection cabinet is realized by known technology, and the collected biogas can be used as lighting at night.

The dissolved oxygen (DO) in the improved UBF high-efficiency anaerobic tank is controlled below 0.2mg/L.

The improved UBF high-efficiency anaerobic tank first separates the organic matter in the sewage, and the separated sludge generates methane through anaerobic digestion, and the separated sewage is directly biodegraded by the high-concentration anaerobic microorganisms attached to the filler. Remove a large amount of organic pollutants (COD) without energy consumption.

The improved UBF high-efficiency anaerobic pond has the function of removing a large amount of COD, BOD and SS.

Further, the improved BAF biological aerated filter unit consists of a mixed liquid water distribution area, a mixed liquid circulating lift pump, a biological aerated filter, a water distribution tank, filter filler, a self-priming jet aerator, a jet pipe and a mixed liquid return flow Pipeline composition: the water inlet of the mixed liquid water distribution area is connected with the decanting tank on the upper part of the improved UBF high-efficiency anaerobic treatment unit, and the bottom of the mixed liquid water distribution area is connected with the bottom of the improved SBR reaction tank through pipes. The mixed liquid circulation lift pump is installed in the mixed liquid water distribution area. The mixed liquid circulation lift pump adopts intermittent operation mode. The aerator and the jet tube extend into the improved SBR reaction pool unit, and the second mixed liquid return pipe is connected to the anoxic adsorption pool unit.

The improved BAF biological aerated filter part is realized by the technologies of the patented "Urban Domestic Sewage Treatment System with High Efficiency and Low Energy Consumption" (ZL 2012 1 0285860.5) and "Energy Saving and Emission Reduction Urban Sewage Treatment System" (ZL 2014 2 0278830.6).

The mixed liquid circulating lift pump adopts an intermittent operation mode, and the running and stopping time of the circulating lift pump are determined according to the quality of the influent water, the treatment effect of the pollutant process and the aerobic digestibility of the sludge.

The mixed liquid circulating lift pump is installed in the mixed liquid water distribution area.

The improved BAF biological aerated filter is placed on the top of the improved SBR reaction tank.

The improved BAF biological aerated filter has the functions of removing a large amount of COD, BOD and denitrification.

Further, the improved SBR reaction tank part is composed of SBR reaction tank, high-concentration granular aerobic activated sludge, mud-water separation zone, inclined tube packing, decanting tank and hydrostatic pressure sludge discharge pipe.

The improved SBR reaction pool is partly realized by the patented "Urban Domestic Sewage Treatment System with High Efficiency and Low Energy Consumption" (ZL2012 1 0285860.5) and "Energy Saving and Emission Reduction Urban Sewage Treatment System" (ZL 2014 2 0278830.6).

The organic sludge discharged from the pretreatment system is aerobically digested in the improved SBR reaction tank, and the digestibility is over 95%.

The sewage is intermittently aerated in the improved SBR reaction tank (the air is provided by a self-priming jet aerator) to achieve anoxic and aerobic alternate cycles.

Organic nitrogen in sewage will be quickly hydrolyzed into ammonia nitrogen in the biochemical treatment system. Under the condition of sufficient oxygen, nitrosifying bacteria and nitrifying bacteria will oxidize ammonia nitrogen into nitrite nitrogen and nitrate nitrogen. Under anoxic conditions, the carbon source (COD) in the sewage is consumed, and the nitrate nitrogen and nitrite nitrogen are reduced to nitrogen by denitrifying bacteria.

The excess sludge in the improved SBR reaction tank is regularly discharged out of the tank through the hydrostatic pressure sludge discharge pipe into the regulating tank, and finally into the anoxic adsorption tank, and finally discharged into the sludge dry tank through the anoxic adsorption tank to complete the treatment of excess sludge.

The improved SBR reaction tank is placed in the lower part of the improved biological aerated filter.

The dissolved oxygen (DO) in the improved SBR reaction tank is controlled between 0.2 mg/L and 3 mg/L.

The improved SBR reaction tank has the functions of removing a large amount of COD, BOD and denitrification, and can perform effective aerobic digestion on organic sludge.

Further, the improved MBBR biofilm treatment unit consists of a first-level improved MBBR tank, a facultative biological filter, a second-level improved MBBR tank and various high-density suspended fillers, fans, micro-aeration delivery systems, mud-water separation areas, fillers , decanting tank and nitrification liquid hydrostatic pressure discharge pipe;

The first-level improved MBBR pool and the second-level improved MBBR pool have the same structure, the upper part is the water intake area, the MBBR filling area, the aerobic aerobic area, and the nitrification area, and the lower part is the sedimentation area and the denitrification area;

The facultative biofilter enters water from the bottom and connects with the bottom of the first-level improved MBBR tank. The upper part is the biological filler area. According to the operation mode of the first-level improved MBBR tank, the sewage is aerobic again in the facultative biological filter. , Anoxic treatment to achieve deep purification of sewage; the upper part of the facultative biological filter is connected to the water inlet area of the upper part of the secondary improved MBBR pool;

The sedimentation area at the bottom of the first-level improved MBBR tank is connected with a nitrification liquid hydrostatic pressure discharge pipe, and the nitrification liquid is discharged out of the pool through the hydrostatic pressure discharge pipe at the bottom of the pool and connected to the regulating pool of the mixed treatment unit, and the sewage is completed in the regulating pool and the anoxic adsorption pool. Denitrification treatment: the outlet elevation of the nitrification liquid hydrostatic pressure discharge pipe is 100mm-1000mm lower than the water outlet of the decanting tank of the facultative biological filter, preferably 250mm. Ensure the minimum water level of the first-level improved MBBR pool to prevent equipment damage caused by long-term unpressurized operation of the fan.

The reaction mechanism of the first-level improved MBBR tank and the second-level improved MBBR tank can be found in the patents "Urban Domestic Sewage Treatment System with High Efficiency and Low Energy Consumption" (ZL 2012 1 0285860.5) and "Energy Saving and Emission Reduction Urban Sewage Treatment System" (ZL 20142 0278830.6).

The reflux part of the nitrifying liquid is composed of a first-stage improved MBBR tank bottom hydrostatic pressure discharge pipe and a flow controller.

The sewage is intermittently aerated in the first-level improved MBBR tank and the second-level improved MBBR tank (the air is provided by the blower) to realize the alternate cycle of anoxic and aerobic. At the same time, the ammonia nitrogen in the sewage is oxidized into nitrite nitrogen and nitrate nitrogen by nitrosifying bacteria and nitrifying bacteria under the condition of sufficient oxygen. Under anoxic conditions, the carbon source (COD) in the sewage is consumed, and the nitrate nitrogen and nitrite nitrogen are reduced to nitrogen by denitrifying bacteria.

The dissolved oxygen (DO) in the aerobic zone of the first-level improved MBBR pool and the second-level improved MBBR pool is controlled between 0.2 mg/L and 2.5 mg/L.

The MBBR biofilm method treats part of a large amount of COD, BOD and denitrification functions, and performs effective aerobic digestion on organic sludge.

Further, the phosphorus removal disinfection system unit includes phosphorus removal disinfection reaction area, chemical phosphorus removal dosing equipment, disinfectant dosing equipment, inclined pipe packing, decanter and phosphorous sludge hydrostatic pressure discharge pipe; phosphorous sludge hydrostatic pressure The discharge pipe is located at the bottom of the secondary modified MBBR pool.

The phosphorus removal and disinfection reaction area is located between the secondary improved MBBR pool and the filtered water pool, and the bottom of the secondary improved MBBR pool is connected to the bottom of the phosphorus removal and disinfection reaction area. Chemical phosphorus removal equipment and disinfectant dosing equipment The dosing pipe extends into the bottom and middle of the phosphorus removal and disinfection reaction zone, and is stirred by hydraulic movement. The phosphorus removal agent, disinfectant and sewage are fully mixed to complete the disinfection, phosphorus removal, and precipitation processes. There are inclined tube fillers in the phosphorus removal and disinfection reaction zone , the upper part is equipped with a decanter, and the phosphorus-containing sludge enters the bottom of the secondary improved MBBR biofilm treatment unit, and is directly discharged into the sludge drying and dehydration unit through the hydrostatic pressure discharge pipe of the phosphorus-containing sludge at the bottom.

The start and stop of the chemical phosphorus removal and dosing equipment and the disinfectant dosing equipment are linked with the start and stop of the sewage lifting pump in the adjustment pool to ensure the treatment effect of the phosphorus removal and disinfection system.

The phosphorus removal and disinfection reaction zone has functions of phosphorus removal and disinfection.

The filter clean water tank unit consists of clean water distribution area, improved filter clean water tank, filter material, filter material support, backwash system, decanting tank, water quality monitoring equipment, backwash liquid discharge pipe, standard sewage discharge pipe, excessive sewage return discharge pipe, It consists of valves, flowmeters, discharge wells and standard sewage discharge pipes.

The improved filter clean water tank is equipped with fiber bundle filter packing and gas backwashing system, the fiber bundle filter filler can effectively remove SS in the sewage, and the improved filter clean water tank regularly adopts a gas backwash system to absorb the fiber bundle filter filler The SS backwashes and discharges the backwashing liquid to the regulating tank through the backwashing liquid discharge pipe.

The water output of the improved filter clear water tank is controlled by a constant valve, and is discharged into the discharge well through the sewage discharge pipe and flow meter, and then discharged into the receiving water body or into the reclaimed water treatment system to realize the reuse of sewage.

The filter clear water pool has the functions of removing SS and monitoring water quality.

In view of the loss of water head in the process section during the sewage treatment process, the top of the anoxic adsorption tank and the improved UBF high-efficiency anaerobic tank are on the same plane, which is lower than that of the improved SBR reaction tank, the first-stage improved MBBR tank, and the facultative biological filtration tank. The pool, the secondary improved MBBR pool, the improved phosphorus removal disinfection reaction area, and the improved filtered water pool have slightly higher pool tops.

The low-energy blower part is composed of low-noise fan, air duct, branch pipe connected to micro-aeration equipment, branch pipe connected to sludge discharge pipe, branch pipe connected to backwashing system of filter clear water tank, control valve and intelligent control system.

The low-noise fan adopts intermittent operation mode, and the operation and stop time of the fan are determined according to the water quality of the first-level improved MBBR pool and the treatment effect of the pollutant process.

The branch pipes connected to the micro-aeration equipment, the branch pipes connected to the sludge discharge pipe, and the branch pipes connected to the backwashing system of the filter clear water tank are independently connected to the air pipes and controlled by independent valves.

According to the BOD concentration in the influent water quality of the first-level improved MBBR tank, the aeration air volume required for the first-level improved MBBR tank and the second-level improved MBBR tank is determined. About ^40m3 of air is required to remove 1kg of BOD. Since the pre-treatment system has removed a large amount of BOD in the sewage, the BOD that actually enters the first-level improved MBBR pool only accounts for 20% to 40% of the total BOD. Therefore, the air volume provided by the fan is greatly reduced, and the energy consumed is compared to The conventional process reduces by more than 60%.

The emergency treatment unit for excess sewage is composed of excess sewage pipes and valves.

One end of the above-standard sewage pipe is connected to the standard sewage discharge pipe in front of the discharge well, and the other end is connected to the backwash liquid discharge pipe. When the feedback information from the water quality monitoring equipment in the improved filter clear water tank shows that the water quality exceeds the standard, close the standard sewage discharge pipe in front of the discharge well. Valve and nitrifying liquid return valve, open the valve on the sewage pipe that exceeds the standard, let the sewage beyond the standard enter the adjustment tank through the backwash liquid discharge pipe, and re-treat through the biological treatment system until it reaches the standard.

The above-standard sewage discharge pipe is connected to the backwash liquid discharge pipe, so as to avoid repeated arrangement of pipes.

The sludge discharge unit is composed of sludge hydrostatic pressure discharge pipes at the bottom of each pool, independent valves for each pool, sludge hydrostatic pressure discharge supervisors, branch pipes connected to fans, and main pipe valves.

The sludge hydrostatic pressure discharge pipes are divided into two groups. One end of the first group is connected to the anoxic adsorption pool, the high-efficiency anaerobic pool, and the secondary improved MBBR pool, and one end is connected to the sludge drying pool; One end is connected to the improved SBR pool, the first-level improved MBBR pool, and the improved filtered clear water pool, and the other end is connected to the regulating pool. The backwash liquid discharge pipe (including the sewage pipe exceeding the standard) can also be connected to the second group of pipes to simplify the process pipeline.

The sludge hydrostatic pressure discharge pipes are all connected to fans, and the air pressure of the fans ensures that the sludge hydrostatic pressure discharge pipes are always unblocked.

The sludge hydrostatic pressure discharge pipes and valves are all outside the tank body.

Further, the utility model also includes a derivative land utilization and carbon source recycling part, which is composed of a sun shed and green plants. In grid tanks, regulating mixed tanks, the upper end of sludge drying tanks and anoxic adsorption tanks, high-efficiency anaerobic tanks, improved SBR reaction tanks, first-level improved MBBR tanks, facultative biofilters, and second-level improved MBBR A solar greenhouse is set up on the upper end of the pool and the improved filtered clear water pool to cover each pool as a whole. In the sunshine greenhouse, in addition to setting the inspection ports of each pool, other spaces use supporting materials to build the bases of vegetables and flowers. Photosynthesis reduces carbon dioxide (or hydrogen sulfide) emissions of sewage treatment plants, increases land utilization, effectively increases the temperature in sewage treatment structures, and promotes the growth and reproduction of microorganisms in the pool.

Harmful gas alarm equipment and ventilation equipment are set in the sunshine greenhouse, which is realized by known technology.

The intelligent control part of the pollutant removal process of the sewage treatment plant is composed of various pollutant online monitors, various instruments and meters, and various electromechanical operation controllers. A number of reasonable operating parameters of sewage treatment technology are established in the time period, and the computer automatically calculates and controls the operation of each unit according to the raw water influent water quality and the pollutant process treatment effect, which is realized by known technology.

This biological circulation sewage treatment system adopts ultra-fine filtration to remove most of the solid matter, uses the adjustment and mixing method to remove a certain amount of ammonia nitrogen and COD, and then removes part of the organic matter, total nitrogen and SS in the sewage through the anoxic adsorption method. Anaerobic digestion of most organic sludge produces methane and removes most of SS, COD, and BOD, and then the remaining organic pollutants, organic sludge, ammonia nitrogen, and phosphate in the sewage are fed by BAF biological aerated filter, SBR reaction tank, and MBBR Biofilm treatment and removal, and finally the fecal coliform and the remaining phosphate are removed by the improved phosphorus removal and disinfection system, and the organic and inorganic substances in the sewage are removed step by step, thereby ensuring the removal rate of pollutants and deriving The recycling of land and carbon sources turns the sewage treatment plant into a green organic factory.

Compared with the existing activated sludge method and biofilm method sewage treatment system, the utility model has the following advantages:

1. Low energy consumption, low carbon source demand, good denitrification effect.

2. Recycling of carbon sources reduces CO ₂ emissions by more than 95%, and does not produce harmful gases such as N ₂ O.

3. No excess organic sludge is produced.

4. Less investment and lower operating costs.

5. Small land occupation, derived land use, reducing land input cost.

6. Safe, stable, reliable and highly automated.

7. After the sewage is treated by the device, the effluent is better than the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) Class A Standard A: pH (dimensionless) 6~9, suspended solids (SS) ≤ 5mg/L , chemical oxygen demand (COD) ≤ 25mg/L, five-day biochemical oxygen demand (BOD ₅ ) ≤ 6mg/L, ammonia nitrogen (NH ₃ -N) ≤ 1.0mg/L, total phosphorus (calculated as P) ≤ 0.1 mg/L, total nitrogen (calculated as N)≤3.0mg/L.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a biological cycle wastewater treatment system;

Fig. 2 is a structural schematic diagram of the sewage ultra-fine filtration treatment unit A, the adjustment mixing treatment unit B and the sludge drying and dehydration unit D;

Fig. 3 is the structure diagram of anoxic adsorption treatment unit C and improved UBF high-efficiency anaerobic treatment unit E;

Fig. 4 is the structural representation of improved BAF biological aerated filter unit F, improved SBR reaction tank unit G, and improved MBBR biofilm process unit H;

Fig. 5 is the structure schematic diagram of dephosphorization disinfection system unit I and the improved filter clear water tank J;

Fig. 6 and Fig. 6A are structural schematic diagrams of the climbing ultra-fine grid machine.

In the figure: Sewage inlet pipe 1, grid pool 2, climbing ultra-fine grid machine 3, grid residue receiving and conveying equipment 4, intelligent equipment control system 5, regulating tank 6, sewage constant lifting pump 7, discharge inlet 8. Intelligent equipment control system 9, grid residue tank 10, sludge drying tank 11, filter plate 12, filter material 13, filter cloth 14, pressure balance pipe 15, grid residue discharge pipe 16, excess sludge discharge pipe 17, Anoxic adsorption tank 18, high-concentration granular and aerobic sludge layer 19, water distributor 20, decanting tank 21, sludge overrun alarm 22, excess sludge hydrostatic pressure discharge pipe 23, anaerobic water distribution area 24, UBF High-efficiency anaerobic tank 25, high-concentration granular anaerobic sludge 26, water distributor 27, filler bracket 28, high-density biological filler 29, decanting tank 30, anaerobic sludge discharge pipe 31, biogas collection cabinet 32, mixed liquid Water distribution area 33, mixed liquid circulation lift pump 34, biological aerated filter 35, water distribution tank 36, filter tank filler 37, filter support 38, self-priming jet aerator 39, jet pipe 40, mixed liquid return pipe 41 , SBR reaction tank 42, high-concentration granular aerobic activated sludge 43, mud-water separation zone 44, inclined pipe packing 45, decanting tank 46, hydrostatic pressure sludge discharge pipe 47, primary MBBR tank 48, facultative biological filter 49 , secondary MBBR tank 50, high-density suspended packing 51, packing support 52, fan 53, micro-aeration conveying system 54, mud-water separation area 55, packing 56, decanting tank 57, nitrifying liquid hydrostatic pressure discharge pipe 58, phosphorus removal and disinfection Reaction area 59, chemical phosphorus removal dosing equipment 60, disinfectant dosing equipment 61, inclined pipe filler 62, decanter 63, phosphorous sludge hydrostatic pressure discharge pipe 64, clean water distribution area 65, filter clear water pool 66, filter Material 67, filter support 68, backwashing system 69, decanting tank 70, water quality monitoring equipment 71, backwash liquid discharge pipe 72, standard sewage discharge pipe 73, excessive sewage return discharge pipe 74, valve 75, flow meter 76, discharge Well 77, up-to-standard discharge pipe 78, air pipe 79, branch pipe 80 connected to micro-aeration equipment, branch pipe 81 connected to sludge discharge pipe, branch pipe 82 connected to backwashing system of filter clear water tank, gas control valve 83, intelligent control system 84. Filter sludge discharge pipe 85, sun shed 86, bracket 87, green plant 88, body 89, feet 90, grid conveyor belt 91, fasteners 92, reducer 93, intelligent equipment control system 94, main Frame 95, water inlet bracket 96, climbing bracket 97, slag outlet bracket 98, slag hopper 99, baffle plate 100, module grid 101, Teflon (polytetrafluoroethylene) mesh belt or grid or Grid 102.

detailed description

Below again in conjunction with accompanying drawing and embodiment the utility model is described further:

Referring to Figure 1, the sewage treatment system of the biological circulation method is composed of sixteen parts: one is the sewage ultra-fine filtration treatment unit A, the other is the adjustment and mixing treatment unit B, the third is the sludge drying and dehydration unit D, and the fourth is anoxic Adsorption treatment unit C, fifth is improved UBF high-efficiency anaerobic treatment unit E, sixth is improved BAF aerated biological filter unit F, seventh is improved SBR reaction tank unit G, eighth is improved MBBR biofilm treatment unit H, Ninth is the improved nitrifying liquid backflow part, Tenth is the improved phosphorus removal and disinfection system unit I, Eleventh is the improved filter clear water tank J, Twelfth is the low-energy aeration part, Thirteen is the emergency treatment part of excessive sewage, The fourteenth is the sludge discharge part, the fifteenth is the derived land utilization and carbon source recycling part K, and the sixteenth is the intelligent control part of the pollutant removal process of the sewage treatment plant.

The sewage treatment system of biological circulation method consists of successively connected water inlet pipes, grille tanks, regulating tanks, anoxic adsorption tanks, UBF high-efficiency anaerobic tanks, improved BAF aerated biological filter tanks, improved SBR reaction tanks, and first-level improved Type MBBR pool, facultative biofilter, secondary improved MBBR pool, improved phosphorus removal disinfection reaction area, improved filtered water pool, sewage metering equipment, discharge well, the above reaction units are connected by pipelines.

The structure and process of each unit of the biological circulation sewage treatment system are as follows:

1. Referring to Figure 2, the sewage ultra-fine filtration treatment unit A is composed of a sewage inlet pipe 1, a grid pool 2, a climbing ultra-fine grid machine 3, screening and conveying equipment 4, and an intelligent equipment control system 5.

The sewage is collected through the municipal pipe network, and enters the grid pool 2 at the front end of the sewage treatment device from the sewage inlet pipe 1. The grid pool 2 is equipped with a climbing type ultra-fine grid machine 3, and a climbing type ultra-fine grid machine 3 The solid matter larger than 1mm can be removed, and the screenings are transported by the screenings receiving and conveying treatment equipment 4 into the screenings pool 10 for treatment, and the screenings are transported out for disposal regularly.

Referring to Figure 6 and Figure 6A, the climbing ultra-fine grid machine is composed of a fuselage 89, feet 90, mesh conveyor belt 91, fasteners 92, reducer 93 and intelligent equipment control system 94, etc. Fuselage 89 is made up of main frame 95, water inlet bracket 96, climbing bracket 97, slag outlet bracket 98, slag outlet 99 and baffle plate 100. The mesh conveyor belt 91 is composed of a modular mesh 101, a Teflon (polytetrafluoroethylene) mesh belt or a grid or a mesh 102, and the like.

2. Referring to Figure 2, the adjustment and mixing treatment unit B consists of an adjustment pool 6, a sewage constant lift pump 7, and a discharge inlet 8 (including the nitrification liquid discharge inlet, the emergency discharge inlet of excess sewage, the filter backwash wastewater discharge inlet, Subsequent treatment system sludge discharge inlet), and intelligent equipment control system 9 and so on.

The sewage treated by the climbing type ultra-fine grid machine 3 enters the regulating pool 6, and the sewage constant lifting pump 7 is installed in the regulating pool 6. The sewage constant lifting pump 7 is preferably an automatic stirring sewage pump, and its characteristics are: the sewage pump device With the rotation of the motor shaft, a strong stirring force is generated, and the sediment in the sewage pool is stirred into suspended matter, which is sucked into the pump and discharged, which improves the anti-blocking and sewage discharge capacity of the pump, and completes drainage, cleaning and desilting at one time, saving energy. running cost. The flow rate of the lifting pump is preferably about 1.5 to 2.0 times of the sewage treatment volume, the purpose is to increase the sewage volume produced by the nitrification liquid return flow, sludge concentrate and sludge return flow in the subsequent treatment process, and ensure the realization of nitrogen and phosphorus removal process. The mechanism is as follows: the domestic sewage is finely filtered by the climbing ultra-fine grid machine and then enters the regulating tank, and is mixed with the nitrifying liquid discharged from the first-level improved MBBR tank, and other sewage or sludge discharged from time to time (exceeding the standard sewage, filtered water, etc.) pool backwash wastewater, follow-up treatment system sludge, and concentrated solution after dehydration in the sludge drying pool), adjust the dissolved oxygen (DO) in the sewage in the pool 6 at 0.2mg/L to 0.5mg/L, and the mixed sewage at Under the condition of hypoxia, and when there is an external carbon source to provide energy (the carbon source is provided by domestic sewage), the denitrifying bacteria will reduce the nitrate nitrogen and nitrite nitrogen into nitrogen and escape, and complete a part of denitrification and denitrification. Cut some COD.

Referring to Fig. 2, the sludge drying and dewatering unit D consists of a grid residue tank 10, a sludge drying tank 11, a filter plate 12, a filter material 13, a filter cloth 14, a pressure balance pipe 15, a grid residue discharge pipe 16 and excess sludge Discharge pipe 17 etc. are formed.

3. Referring to Figure 3, the anoxic adsorption treatment unit C consists of an anoxic adsorption pool 18, a high-concentration granular and aerobic sludge layer 19, a water distributor 20, a decanting tank 21, a sludge overrun alarm 22, and excess sludge Hydrostatic pressure discharge pipe 23 etc. are formed.

The mixed sewage in the adjustment pool 6 is lifted to the anoxic adsorption pool 18 through the sewage constant lifting pump 7, and the bottom of the anoxic adsorption pool 18 is provided with a water distributor 20, and the pressurized sewage passes through the anoxic adsorption pool 18 through the water distributor 20 The high-concentration granular and aerobic sludge layer 19 inside stirs the sludge to form an anoxic fluidized bed. When the high-concentration granular and oxygenated sludge layer 19 in the anoxic adsorption tank 18 exceeds the set critical point, the sludge overrun alarm 22 will alarm, and the valve on the hydrostatic pressure discharge pipe 23 of the remaining sludge will be opened automatically or manually. The excess sludge is discharged into the sludge drying tank 11 through the excess sludge discharge pipe 17 for dehydration and concentration treatment, the sludge concentrate is directly discharged into the adjustment tank 6, and the dried sludge is regularly transported out for disposal.

The DO dissolved oxygen meter in the anoxic adsorption pool 18 is used to adjust the sewage return flow delivered by the mixed liquid circulation lift pump in the improved SBR reaction pool, so that the dissolved oxygen (DO) in the anoxic adsorption pool 18 is controlled at 0.2mg/L～ Between 0.5mg/L.

In the anoxic adsorption tank 18, there is a high-concentration granular facultative sludge layer 19, the sludge has a large surface area (between 2,000 and 10,000m ² /m of mixed liquid), and the surface has a layer of polysaccharide slime, which is suspended in the sewage Colloidal and colloidal substances are removed by flocculation and adsorption. After the colloidal macromolecular organic matter is adsorbed, it is first decomposed into small molecular substances by hydrolysis bacteria, and then these small molecules and dissolved organic matter provide nutrients for the high-concentration microorganisms in the sludge to complete the purification of sewage.

After the nitrifying liquid is treated in the regulating tank 6, it enters the anoxic adsorption tank 18 for treatment again. Under the action of denitrifying bacteria in the anoxic adsorption tank 18, the nitrate nitrogen and nitrite nitrogen in the sewage are reduced to nitrogen and escape, and the process is completed. The removal of total nitrogen in sewage is achieved, and the pre-denitrification of the system is realized.

The dissolved oxygen DO in the sewage and high-concentration facultative oxygen sludge layer 19 in the anoxic adsorption tank 18 is maintained between 0.2 mg/L and 0.5 mg/L, and the total phosphorus lifted from the adjustment tank accumulates at a high concentration In the granular and aerobic sludge layer 19 , the effective accumulation of total phosphorus in the domestic sewage treatment system is completed, and a small amount of total phosphorus is used as nutrients required for sewage treatment, and most of it is stored in the sludge in the anoxic adsorption tank 18 . As the height of the sludge layer in the anoxic adsorption tank 18 increases, it is discharged into the sludge drying tank 11 through the excess sludge discharge pipe 17 to complete the removal of total phosphorus.

4. Referring to Figure 3, the improved UBF high-efficiency anaerobic treatment unit E consists of anaerobic water distribution area 24, UBF high-efficiency anaerobic tank 25, high-concentration granular anaerobic sludge 26, water distributor 27, packing support 28, high-density Biological filler 29, decanting tank 30, anaerobic sludge discharge pipe 31, biogas collection cabinet 32 and multiple groups connected in parallel.

After the sewage is treated by the anoxic adsorption pool 18, it is evenly collected through the decanting tank 21 on the top of the anoxic adsorption pool 18 and enters the anaerobic water distribution area 24, and the sewage enters the UBF high-efficiency anaerobic pool 25 from the anaerobic water distribution area 24 through the water distributor 27 , the UBF high-efficiency anaerobic tank 25 first separates the organic matter in the sewage, and the separated sludge generates methane through anaerobic digestion, and the separated sewage is directly biodegraded by the high-concentration anaerobic microorganisms attached to the high-density biological filler 29 , to remove a large amount of organic pollutants (COD) under the condition of no energy consumption.

The biogas generated in the UBF high-efficiency anaerobic pond 25 is collected by the biogas collection cabinet 32 on the top of the UBF high-efficiency anaerobic pond 25, and is used for night lighting of the facility.

The remaining high-concentration granular anaerobic sludge 26 produced in the UBF high-efficiency anaerobic tank 25 is discharged into the regulating tank 6 through the discharge inlet 8 through the anaerobic sludge discharge pipe 31, and finally enters the anoxic adsorption tank 18 and then discharged into the sludge Drying pond 11 is processed.

Phosphorus accumulating bacteria in sewage are suppressed under anaerobic conditions in the UBF high-efficiency anaerobic pool 25 to release phosphate in the body, generate energy to absorb organic matter, and convert it into PHB (poly-β-hydroxybutyric acid) for storage.

5. After the sewage is treated by the grid pool 2, regulating pool 6, anoxic adsorption pool 18, and UBF high-efficiency anaerobic pool 25, the removal rate of COD and BOD will reach more than 80%, which will reduce the operating load of the subsequent treatment system played a key role.

6. Referring to Figure 4, the improved BAF biological aerated filter unit F consists of a mixed liquid water distribution area 33, a mixed liquid circulation lift pump 34, a biological aerated filter tank 35, a water distribution tank 36, a filter tank filler 37, and a filter material support 38 , self-priming jet aerator 39, jet pipe 40 and mixed liquid return pipeline 41 etc. composition.

The improved SBR reaction tank unit G is composed of SBR reaction tank 42, high-concentration granular aerobic activated sludge 43, mud-water separation zone 44, inclined pipe packing 45, decanting tank 46 and hydrostatic pressure sludge discharge pipe 47, etc.

After the sewage is treated by the UBF high-efficiency anaerobic tank 25, it is evenly collected through the decanting tank 30 on the top of the UBF high-efficiency anaerobic tank 25 and enters the mixed liquid water distribution area 33. One or more sets of mixed liquid circulation lifts are installed in the mixed liquid water distribution area 33 Pump 34, two branch pipes are installed on the outlet pipe of the mixed liquid circulation lifting pump 34, one pipe enters the biological aerated filter tank 35 in the BAF biological aerated filter unit, and one pipe enters the anoxic adsorption tank 18, The mixed liquid is transported by the mixed liquid circulating lift pump 34 to the biological aerated filter 35 and the anoxic adsorption tank 18. The dissolved oxygen (DO) of the mixed liquid is 2-3 mg/L, and the dissolved oxygen (DO) in the anoxic adsorption tank 18 ( DO) The valve on the branch pipeline controls the return flow of the mixed liquid to ensure that the dissolved oxygen (DO) in the anoxic adsorption pool 18 is 0.2-0.5 mg/L, which meets the denitrification and denitrification treatment of sewage in the anoxic adsorption pool 18 .

The BAF aerated biological filter is placed on the top of the improved SBR reaction tank, and the mixed liquid is lifted and transported by the mixed liquid circulating lift pump 34 to circulate intermittently between the improved BAF aerated biological filter and the improved SBR reaction tank. The sewage is here Through biofilm method and activated sludge method, the organic combination of the two sewage treatment technologies is realized. This process section has the functions of anoxic and aerobic treatment at the same time. The organic pollutants in the sewage are treated intensively, and a large amount of COD, BOD, SS, ammonia nitrogen.

7. Referring to Fig. 4, the sewage enters the mud-water separation zone 44 after being treated by the biological aerated filter 35 and the SBR reaction tank 42, and the sludge carried in the sewage is returned to the SBR reaction tank 42 through the inclined pipe filler 45, realizing the pump-free Sludge backflow achieves the purpose of energy saving. The sewage is evenly collected by the decanting tank 46 at the top of the mud-water separation area 44 and enters the subsequent first-stage MBBR tank 48. The phosphorus accumulating bacteria in the sewage degrade the PHB stored in the body under the aerobic condition of the SBR reaction tank 42 to generate energy for cell regeneration. Synthesize, absorb phosphorus excessively at the same time, form the sludge of high phosphorus concentration, the remaining sludge in SBR reaction tank 42 is discharged into regulating tank 6 through hydrostatic pressure sludge discharge pipe 47, finally enters anoxic adsorption tank 18 and then is discharged into sewage Mud drying tank 11 is processed.

8. Referring to Fig. 4, the improved MBBR biofilm process unit H consists of a primary MBBR pool 48, a part-aerobic biofilter 49, a secondary MBBR pool 50, and high-density suspended fillers 51, filler brackets 52, fans 53, micro The aeration conveying system 54, the mud-water separation area 55, the filler 56, the decanting tank 57 and the nitrification liquid hydrostatic pressure discharge pipe 58 etc. are composed.

After the sewage is separated from the sludge and water through the sludge-water separation zone 44, the sewage enters the primary MBBR tank 48, and the organic pollutants are removed under the condition of high-density suspended filler 51 and fan 53 supplying oxygen and under the action of aerobic microorganisms. The organic nitrogen in the sewage will be quickly hydrolyzed into ammonia nitrogen in the biochemical treatment system, and then under the condition of sufficient oxygen in the first-level MBBR tank 48, the nitrosating bacteria and nitrifying bacteria will oxidize the ammonia nitrogen into nitrite nitrogen and nitrate nitrogen , become nitrifying liquid, and the phosphorus accumulating bacteria in the sewage degrade the PHB stored in the body under the aerobic condition of the first-level MBBR pool at the same time to generate energy, which is used for the synthesis of cells, and at the same time absorbs excessive phosphorus to form a high phosphorus concentration The sludge, nitrifying liquid and phosphorus-containing sludge are discharged into the regulating tank 6 through the hydrostatic pressure discharge pipe 58 of the nitrifying liquid, so as to realize the reflux denitrification treatment of the nitrifying liquid, and the phosphorus-containing sludge finally enters the anoxic adsorption pool 18 and then is discharged into the sludge drying Chemical pool 11 processing.

The primary MBBR pool 48 of this design has an aerobic zone, a nitrification zone, a sedimentation zone, and a denitrification zone at the same time.

9. After the sewage is treated by the primary MBBR pool 48, it enters the facultative biofilter 49. The facultative biofilter 49 also has the functions of mud-water separation, filtration, denitrification, and biodegradation of organic pollutants. After being treated by the facultative biological filter 49, the sewage enters the secondary MBBR pool 50 for treatment again, and the secondary MBBR pool 50 has the same function as the primary MBBR pool 48.

10. Referring to Figure 5, the phosphorus removal disinfection system unit I consists of a phosphorus removal disinfection reaction zone 59, chemical phosphorus removal dosing equipment 60, disinfectant dosing equipment 61, inclined tube packing 62, decanter 63 and phosphorous sludge static water Pressure discharge pipe 64 etc. are formed.

After being treated by the secondary MBBR tank 50, the sewage enters the bottom of the dephosphorization and disinfection reaction zone 59, and the remaining phosphate in the sewage reacts with the iron salt or aluminum salt delivered by the chemical dephosphorization dosing equipment 60 to form PO ₄ ^3- to form insoluble The compound is precipitated under the action of the inclined tube filler 62, and the precipitated phosphorus-containing sludge enters the bottom of the secondary improved MBBR tank 50, and then is directly discharged into the sludge drying tank 11 through the phosphorus-containing sludge hydrostatic pressure discharge pipe 64 for treatment.

The clean water in the upper part of the phosphorus removal disinfection reaction zone 59 is contacted with the disinfectant delivered by the disinfectant dosing equipment 61, and the fecal coliforms are removed and then discharged into the clean water distribution zone 65 through the decanter 63.

11. Referring to Fig. 5, the improved filter clean water tank unit J consists of clean water distribution area 65, filter clean water tank 66, filter material 67, filter material support 68, backwash system 69, decanting tank 70, water quality monitoring equipment 71, backwash liquid Discharge pipe 72, up-to-standard sewage discharge pipe 73, over-standard sewage backflow discharge pipe 74, valve 75, flow meter 76, discharge well 77 and up-to-standard sewage discharge pipe 78 etc. are composed.

The sewage flows into the bottom of the filtered clean water pool 66 through the clean water distribution area 65, and is treated by the filter material 67. After removing the suspended solids (SS) in the sewage, it is monitored by the water quality monitoring equipment 71. The qualified and up-to-standard sewage passes through the decanting tank 70 and the up-to-standard sewage discharge pipe 73 , a valve 75, a flow meter 76, a discharge well 77, and a standard discharge pipe 78 are discharged into natural water bodies or reused. Unqualified waste water that fails to reach the standard is discharged into the regulating tank for further treatment through the decanting tank 70, the return discharge pipe 74 of the exceeding standard sewage, and the discharge inlet 8 until it reaches the standard. The remaining unqualified sewage that fails to meet the standard in the filtered clear water pool 66 is discharged into the regulating pool through the backwash liquid discharge pipe 72 and the discharge inlet 8 for further processing until it reaches the standard. The emergency treatment part of exceeding standard sewage is composed of exceeding standard sewage pipes and valves.

The filter sludge is discharged into the regulating tank through the filter sludge discharge pipe 85 and the discharge inlet 8, and finally enters the anoxic adsorption tank 18 and then is discharged into the sludge drying tank 11 for treatment.

12. According to the situation of the clear water level in the upper part of the phosphorus removal and disinfection reaction zone 59, determine whether the improved filter clear water pool 66 is blocked. Valve 75, open the gas control valve 83 to supply air through the branch pipe 82 connected to the backwashing system of the filtered clean water tank, and backwash the improved filtered clean water tank 66, and the backwash waste water is discharged into the backwash liquid discharge pipe 72 and the discharge inlet 8 Conditioning pools are processed again.

13. When the sludge is regularly discharged from each pool, if the sludge discharge pipe or the sludge pipe is blocked, open the valve on the single sludge discharge pipe, close the valves on the other sludge discharge pipes, and close the valves on the other aeration systems at the same time. The branch pipe 81 connected to the sludge discharge pipe is supplied with air, and the sludge discharge pipe is connected with air pressure. The sludge discharge part is composed of sludge hydrostatic pressure discharge pipes at the bottom of each pool, independent valves for each pool, sludge hydrostatic pressure discharge supervisors, branch pipes connected to fans, and main pipe valves.

14. Construct a garden factory integrating sun sheds 86, brackets 87, and green plants 88 in response to the problem of microbial growth affected by winter temperatures in high-cold and high-altitude areas and the use of derived land and carbon source recycling.

15. After the sewage is purified and treated by the biological circulation sewage treatment system, the discharged water is better than the first-level standard A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002): pH (dimensionless) 6-9, suspended solids (SS) ≤5mg/L, chemical oxygen demand (COD) ≤25mg/L, five-day biochemical oxygen demand (BOD ₅ ) ≤6mg/L, ammonia nitrogen (NH ₃ -N) ≤1.0mg/L, total phosphorus (calculated as P)≤0.1mg/L, total nitrogen (calculated as N)≤3.0mg/L, animal and vegetable oil≤0.2mg/L, petroleum ≤0.1mg/L, anionic surfactant≤0.2mg/L, Chromaticity (dilution factor) ≤ 5, number of fecal coliform bacteria (unit/L) ≤ 10 ² .

The system adopts low-energy blasting, which is composed of low-noise fan, air pipe, branch pipe connected to micro-aeration equipment, branch pipe connected to sludge discharge pipe, branch pipe connected to backwashing system of filter clear water tank, control valve and intelligent control system .

This system adopts the intelligent control of the pollutant removal process of the sewage treatment plant, and is composed of various pollutant online monitors, various instruments and meters, various electromechanical operation controllers, etc.

The system is continuous water intake and continuous drainage, and each processing unit can be connected in series or in parallel.

The regulating tank of this system accepts the sewage in the follow-up process (nitrifying liquid, sewage exceeding the standard, filter backwashing wastewater and concentrated solution after dehydration in the sludge drying tank) in the subsequent process under the condition of no energy consumption. Under the condition of no energy consumption, the nitrifying liquid is quantitatively directly returned to the regulating tank.

The high-density biological filler in the UBF high-efficiency anaerobic tank of this system is preferably fiber bundle filter material or other biological fillers with a large specific surface area, and the filler area accounts for 30% to 80% of the tank volume.

The primary MBBR pool, facultative biofilter, secondary MBBR pool, phosphorus removal disinfection reaction area and filtered water pool of this system all have the function of denitrification and denitrification area.

The filter clear water tank of this system is equipped with fiber bundle filter packing and gas backwashing system.

Example

1. The sewage treatment scale is 2000 tons/day (100 tons/hour).

2. The in-plant investment of the sewage treatment plant is about 7.08998 million yuan, including about 2.78682 million yuan for civil engineering, about 4.30316 million yuan for the purchase and installation of equipment and tools, and about 3544.99 yuan for tons of water.

3. Covers an area of about 1575 square meters (about 2.36 acres), unit area: 0.7875m ² /m ³ . Sewage, of which the effective pool capacity is about 3568.54 cubic meters.

4. The annual operating cost is about 90,082 million yuan, the total daily operating electricity cost is 246.80 yuan (unit price 0.8 yuan/kw.h), the basic operating cost (electricity charge) is 0.1234 yuan/ton sewage, and the power consumption per ton of water is 0.15425kw. h, the model of the grid machine (JSD climbing ultra-fine grid machine) is: JSD-2000, power 0.75kw, one set for one use and one for standby, and the running time is 6 hours; the lifting pump (JYWQ type automatic stirring submersible sewage discharge Pump) model is JYWQ100-100-15-2000-7.5, one use and one standby, running time 20 hours; circulation lift pump (QW type non-clogging submersible sewage pump) model is 200QW300-7-11, one use and one standby, running The time is 8 hours; the fan (HC-100S), the speed is 1400rpm, the air volume is 4.11m ³ /min, the power is 5.5kw, dual-purpose and one standby, the running time is 6 hours; the total power consumption is 308.5kw.h/day (lift pump 150kw. h/day, circulating lift pump 88kw.h/day, fan 66kw.h/day, mechanical grill 4.5kw.h/day).

The degree of automation is high, the electrical control system is simple, two people are on duty, the monthly salary is 3,000 yuan per person, and the cost of water per ton is 0.10 yuan.

The cost of phosphorus removal disinfectant per ton of water is 0.10 yuan.

Due to the sufficient anaerobic and aerobic digestion of sludge in this design, the annual sludge production is about 30 tons, the disposal cost is about 6,000 yuan, and the daily cost per ton of water is about 0.008 yuan.

The total direct cost of operation is 0.3316 yuan/ton · sewage, and the daily operation cost is 663.20 yuan.

5. Economic benefits

A solar greenhouse can be built with an area of about 1,000 square meters (about 1.5 mu). If you grow vegetables, you can earn about 20,000 yuan per mu of land a year, and the total income is about 30,000 yuan.

6. Environmental benefits

The quality of urban domestic sewage treated is as follows: chemical oxygen demand (COD) 400mg/L (average), biochemical oxygen demand (BOD ₅ ) 200mg/L (average), suspended solids (SS) 200mg/L (average Value), ammonia nitrogen (calculated as N) 35mg/L (average value), total phosphorus (calculated as P) 5mg/L (average value), pH6～9.

The treated effluent quality is as follows: chemical oxygen demand (COD) is 20mg/L (removal rate 95%), biochemical oxygen demand (BOD ₅ ) is 5mg/L (removal rate 97.5%), suspended solids (SS) is 2mg/L (removal rate 99%), ammonia nitrogen (calculated as N) is 1mg/L (removed rate 97.14%), total phosphorus (calculated as P) is 0.1mg/L (removed rate 98%), pH6～9.

The specific process is as follows:

1) After urban (town) domestic sewage is treated by the sewage ultra-fine filtration treatment part, adjustment and mixing treatment part, sludge drying and dehydration part, anoxic adsorption treatment part, and improved UBF high-efficiency anaerobic treatment part, the removal of about 80% of the organic pollutants have played a positive role in saving energy and reducing consumption in the subsequent treatment process. The main pollution factors to be removed are SS, COD, BOD, ammonia nitrogen, total nitrogen, total phosphorus, animal and vegetable oils, petroleum, anionic surfactants, and chroma.

2) The sewage passes through the improved BAF aerated biological filter part, the improved SBR reaction tank part, the improved MBBR biofilm method treatment part, the improved nitrifying liquid backflow part, the improved phosphorus removal and disinfection system part, and the improved filter clear water tank Partial, low-energy aeration partial treatment, continuous water inflow supplements the carbon source required for each stage of denitrification, effectively removes organic pollutants, ammonia nitrogen, total nitrogen and total phosphorus under the condition of low energy consumption, and rationally utilizes the energy of a single structure Structural features, strengthening unit treatment capacity, the same structure treatment unit process realizes aeration, sedimentation, filtration, sludge return, nitrification, denitrification, and gradually degrades pollutants in steps to ensure the supply of nutrients in the process of reaction tanks at all levels to meet The growth of microorganisms requires that the cutting and crushing function of the filler be fully utilized during the aeration process to improve the oxygen-dissolving capacity of the sewage, reduce the running time of the fan, and avoid energy loss. The main pollution factors to be removed are SS, COD, BOD, ammonia nitrogen, total nitrogen, total phosphorus, and chroma.

3) The emergency treatment part of exceeding the standard sewage is the key to the stable discharge of the sewage treatment plant, which effectively prevents the environmental pollution incidents caused by the discharge of non-standard sewage into the water body.

4) Derivative land utilization and carbon source recycling part is to further comprehensively utilize reclaimed land, reduce carbon dioxide emissions, and help sewage treatment in low-temperature areas to meet stable discharge standards.

5) The intelligent control part of the pollutant removal process of the sewage treatment plant is to realize Made in China 2025, to realize the fully intelligent and fully automatic operation of the facilities of the sewage treatment plant, not to affect the sewage treatment effect by the quality of the employees, and to ensure the standardization and dataization of the sewage treatment plant .

Application range

The biological cycle sewage treatment system can realize modular construction, not only for the treatment of domestic sewage in new cities (towns), but also for the upgrading and transformation of sewage treatment plants, and the construction and transformation of domestic sewage treatment stations in small towns.

Claims (9)

1. A sewage treatment system with biological circulation method, including a sewage ultra-fine filtration treatment unit connected by pipelines, an adjustment and mixing treatment unit, an anoxic adsorption treatment unit, a sludge drying and dehydration unit, and an improved UBF high-efficiency anaerobic treatment unit , Improved BAF aerated biological filter unit, improved SBR reaction tank unit, improved MBBR biofilm treatment unit, phosphorus removal and disinfection system unit and improved filter clear water tank; It is characterized in that the sewage inlet pipe is connected to the sewage ultra-fine filtration treatment unit, and the treated sewage is connected to the adjustment and mixing treatment unit; The mixed sewage treated by the mixed treatment unit is adjusted to be connected to the anoxic adsorption treatment unit; The sewage treated by the anoxic adsorption treatment unit is connected to the improved UBF high-efficiency anaerobic treatment unit, and the remaining sludge generated by the treatment is discharged into the sludge drying and dehydration unit; The sludge drying and dehydration unit is arranged above the regulating mixing treatment unit, and the sludge concentrate is directly discharged into the regulating mixing treatment unit; The effluent of the improved UBF high-efficiency anaerobic treatment unit is connected to the mixed liquid water distribution area, and mixed with part of the sewage of the improved SBR reaction tank unit, and divided into two routes, one of which is connected to the improved BAF aerated biological filter unit, and the other is connected back The remaining high-concentration granular anaerobic sludge produced by the improved UBF high-efficiency anaerobic treatment unit is discharged into the regulating mixing treatment unit through the anaerobic sludge discharge pipe connected to the discharge inlet of the regulating mixing treatment unit. processing unit; The improved BAF aerated biological filter unit is located above the improved SBR reaction tank unit, and the water treated by the improved BAF aerated biological filter unit enters the improved SBR reaction tank unit through the jet device, and the internal part of the improved SBR reaction tank unit The sewage and the effluent of the improved UBF high-efficiency anaerobic treatment unit are mixed in the mixed liquid water distribution area, and the mixed liquid is lifted by the mixed liquid circulation lifting pump and transported back to the improved BAF aerated biological filter unit, so that the mixed liquid is in the improved BAF aerated biological filter unit. Intermittent circulation between the filter tank and the improved SBR reaction tank, where the sewage is treated by the biofilm method and the activated sludge method, and the sewage treated by the SBR reaction tank unit is connected to the first-level improved MBBR biofilm treatment unit; The sewage treated by the first-level improved MBBR biofilm treatment unit is connected to the second-level improved MBBR biofilm treatment unit, and the nitrifying liquid generated in the treatment of the first-level improved MBBR biofilm treatment unit passes through the hydrostatic pressure of the nitrifying liquid at the bottom The discharge pipe is connected to the discharge inlet of the regulating mixing treatment unit, and the discharge enters the regulating mixing treatment unit; The sewage treated by the secondary improved MBBR biofilm treatment unit is connected to the phosphorus removal and disinfection system unit; Phosphorus removal and disinfection system unit has chemical phosphorus removal dosing equipment and disinfectant dosing equipment. The remaining phosphate in the sewage reacts with the iron salt or aluminum salt delivered by the chemical phosphorus removal dosing equipment to generate PO ₄ ^3- to form insoluble Compounds, phosphorus-containing sludge deposited by the phosphorus removal and disinfection system unit enters the bottom of the secondary MBBR biofilm treatment unit, and is directly discharged into the sludge drying and dehydration unit through the hydrostatic pressure discharge pipe of the phosphorus-containing sludge at the bottom. The phosphorus removal and disinfection system The clean water obtained by the unit treatment is contacted with the disinfectant delivered by the disinfectant dosing equipment, and connected to the filtered clean water pool after disinfection; The filtered clean water tank is connected with a standard-reaching external discharge pipe, and the standard-reaching water is discharged into the natural water body or reused. It is also connected with an excessive-standard sewage return discharge pipe, which is connected back to the discharge inlet of the regulating mixing treatment unit, and is discharged into the regulating pool again. deal with. 2. The biological circulation sewage treatment system according to claim 1, characterized in that, the sewage ultra-fine filtration treatment unit includes, from front to back, a grid pool, a climbing type ultra-fine grid machine, and a grid residue receiving unit. Conveying and processing equipment and screening tank; a climbing type ultra-fine grid machine is installed in the grid tank, and the end of the climbing type ultra-fine grid machine is connected to the grid residue receiving and conveying processing equipment, and the conveying end of the screening receiving and conveying processing equipment is connected end of the grid residue pool. 3. The biological circulation sewage treatment system according to claim 1, characterized in that, the adjustment and mixing treatment unit includes an adjustment tank and a sewage constant lift pump; The sewage treated by the grid machine enters the regulating pool, and the body of the regulating pool is provided with a discharge inlet, and a sewage constant lifting pump is installed in the pool, and the water supply pipe of the sewage constant lifting pump is an anoxic adsorption treatment unit. 4. The sewage treatment system according to claim 1, characterized in that the anoxic adsorption treatment unit comprises an anoxic adsorption pool, a high-concentration granular and aerobic sludge layer, a water distributor, a decanting tank and sludge Over-limit alarm, DO dissolved oxygen meter and residual sludge hydrostatic pressure discharge pipe; the anoxic adsorption tank is equipped with a high-concentration granular and aerobic sludge layer, and a water distributor is installed at the bottom, and the sewage under pressure passes through the water distributor The high-concentration granular and oxygenated sludge layer stirs the sludge to form an anoxic fluidized bed; the anoxic adsorption tank is also equipped with a sludge over-limit alarm and a DO dissolved oxygen meter, and the remaining sludge is discharged under hydrostatic pressure at the bottom of the tank The pipe is connected to the sludge drying and dehydration unit, and the upper part of the anoxic adsorption tank is provided with a decanting tank, which is connected to the improved UBF high-efficiency anaerobic treatment unit. 5. The biological circulation sewage treatment system according to claim 1, wherein the improved UBF high-efficiency anaerobic treatment unit comprises anaerobic water distribution area, improved UBF high-efficiency anaerobic pool, high-concentration granular anaerobic sludge , water distributor, high-density biological filler, decanting tank, anaerobic sludge discharge pipe, biogas collection cabinet; the water inlet of the anaerobic water distribution area is connected with the decanting tank on the upper part of the anoxic adsorption treatment unit, and the improved UBF high-efficiency anaerobic The oxygen tank is composed of one or more grids. The tank is equipped with high-density biological fillers, and a water distributor is installed. The water distributor is connected to the water outlet of the anaerobic water distribution area. The upper part of the improved UBF high-efficiency anaerobic tank is provided with a decanter connected to the improved BAF. In the mixed liquid distribution area of the biological aerated filter unit, an anaerobic sludge discharge pipe is installed at the bottom, and a biogas collection tank is installed at the top. 6. The biological circulation method sewage treatment system according to claim 1, wherein the improved BAF biological aerated filter unit comprises a mixed solution water distribution area, a mixed solution circulation lifting pump, a biological aerated filter, a water distribution tank, Filter filler, self-priming jet aerator, jet pipe and mixed liquid return pipe; the water inlet of the mixed liquid distribution area is connected to the decanting tank on the upper part of the improved UBF high-efficiency anaerobic treatment unit, and the bottom of the mixed liquid distribution area is connected to the The bottom of the improved SBR reaction tank is connected by pipes. The mixed liquid circulation lift pump is installed in the mixed liquid water distribution area. The mixed liquid circulation lift pump adopts intermittent operation mode. The aerated biological filter, the self-priming jet aerator and the jet pipe extend into the improved SBR reaction pool unit, and the other one is connected to the mixed liquid return pipe to connect to the anoxic adsorption pool unit. 7. The biological circulation sewage treatment system according to claim 1, characterized in that, the improved MBBR biofilm treatment unit comprises a first-level MBBR pool, a concurrently aerobic biofilter, a secondary MBBR pool and high-density suspended fillers, Fan, microporous aeration conveying system, mud-water separation area, packing, decanting tank and nitrification liquid hydrostatic pressure discharge pipe; The first-level MBBR pool and the second-level MBBR pool have the same structure, the upper part is the water intake area, the MBBR filling area, the aerated aerobic area, and the nitrification area, and the lower part is the sedimentation area and the denitrification area; The facultative biofilter enters water from the bottom and connects with the bottom of the first-stage MBBR pool, and the upper part is the biological filler area; the facultative biological filter is discharged from the upper part, which is connected to the upper water inlet area of the second-stage MBBR pool; The sedimentation area at the bottom of the primary MBBR tank is connected with a nitrification liquid hydrostatic pressure discharge pipe, and the nitrification liquid is discharged out of the pool through the hydrostatic pressure discharge pipe at the bottom of the pool and connected to the regulating tank of the mixed treatment unit; the outlet elevation of the nitrification liquid hydrostatic pressure discharge pipe is lower than that of the facultative The water outlet of the decanting tank of the biological filter is 100mm to 1000mm. 8. The sewage treatment system with biological circulation method according to claim 1, characterized in that, the phosphorus removal and disinfection system unit includes a phosphorus removal and disinfection reaction zone, chemical phosphorus removal dosing equipment, disinfectant dosing equipment, inclined tube fillers, decanting Water tank and phosphorus-containing sludge hydrostatic pressure discharge pipe; the phosphorus-containing sludge hydrostatic pressure discharge pipe is located at the bottom of the secondary MBBR tank; The phosphorus removal disinfection reaction area is located between the secondary MBBR pool and the filtered water pool, and the bottom of the secondary MBBR pool is connected to the bottom of the phosphorus removal disinfection reaction area. Enter the bottom and middle of the phosphorus removal disinfection reaction zone, use hydraulic movement to stir, the phosphorus removal agent, disinfectant and sewage are fully mixed, and complete the disinfection, phosphorus removal and sedimentation process. There is an inclined tube packing in the phosphorus removal disinfection reaction zone, and the upper part is set The phosphorus-containing sludge enters the bottom of the secondary MBBR biofilm treatment unit, and is directly discharged into the sludge drying and dehydration unit through the hydrostatic pressure discharge pipe of the phosphorus-containing sludge at the bottom. 9. The sewage treatment system of biological circulation method according to claim 1, characterized in that, it also includes derivative land utilization and carbon source recycling parts, which are composed of sunshine sheds and green plants; The upper end of the mud drying pool and the anoxic adsorption pool, the improved UBF high-efficiency anaerobic pool, the improved SBR reaction pool, the first-level MBBR pool, the facultative biological filter, the second-level MBBR pool, and the filtered water pool are set up with a solar greenhouse. Each pond is covered as a whole, and vegetables, flowers and green plants are planted in the sunshine greenhouse.