CN215249845U - Improved UASB system - Google Patents
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- CN215249845U CN215249845U CN202121171303.1U CN202121171303U CN215249845U CN 215249845 U CN215249845 U CN 215249845U CN 202121171303 U CN202121171303 U CN 202121171303U CN 215249845 U CN215249845 U CN 215249845U
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Abstract
The utility model discloses an improved generation UASB system, the utility model discloses an improved generation UASB system burns the utilization unit including intaking and anaerobic cycle unit, anaerobic reactor unit, mud-water separation unit and marsh gas, and its filtration liquid processing method includes into water, reaction and separation, the utility model discloses an improved generation UASB device system has solved traditional UASB reaction efficiency and has hanged down, and shock resistance load is weak, and the anaerobism goes out water and runs a great deal of problems such as mud easily, applies to filtration liquid anaerobic treatment field simultaneously and can high-efficiently degrade its pollutant.
Description
The technical field is as follows:
the utility model belongs to the technical field of msw incineration power generation, specifically be an improved generation UASB system.
Background art:
aiming at the field of waste incineration power generation, after household garbage is transported to a waste incineration power plant through a garbage collection and transportation vehicle and poured into a garbage pool, before the household garbage is burnt in a furnace, the garbage pool needs to be subjected to water filtration and fermentation for 5-10d, and a large amount of toxic, harmful and high-pollution garbage percolate is generated in the process. The leachate belongs to high-concentration organic sewage and has high ammonia nitrogen content. Removing CODcr and BOD from leachate5、SS、NH3The pollutants such as-N and the like seriously exceed the standard, and the pollutants comprise halogenated aromatic hydrocarbon, heavy metal, virus and the like. The main water quality indexes are as follows:
PH＝4-8，BOD5＝10000-40000mg/L，CODcr＝20000-75000mg/L；
SS＝2000-20000mg/L，NH3-N＝1000-2500mg/L；
TN＝1500-3000mg/L，TP＝2.0-5.0mg/L；
stink- -foul smell, slightly ammoniacal smell; color-yellow brown, black.
The chroma is 10000 times of 500-; alkalinity (CaCO3) 5000-.
The organic acid is 50-24000 mg/L.
At present, a leachate treatment system in the mainstream of the industry adopts a process of pretreatment, a regulating tank, UASB, MBR, Nanofiltration (NF), RO and DTRO to treat, and a plurality of problems of low COD and BOD degradation reaction efficiency, weak impact load resistance, easy sludge leakage of anaerobic effluent and the like exist in the UASB anaerobic reaction process. In addition, because the anaerobic treatment volume load is too low due to weak impact load resistance and low reaction efficiency, the biogas generation rate is low, and the methane concentration in the biogas is not high, generally 50-60%.
The utility model has the following contents:
to solve the above problem, the to-be-solved technical problem of the utility model is to provide a filtration liquid processing method of improved generation UASB system and application this system.
The utility model discloses an improved UASB system, including intaking with anaerobic cycle unit, anaerobic reactor unit, mud-water separation unit and marsh gas burn and utilize the unit, intake and cycle unit and anaerobic reactor unit link to each other, anaerobic reactor unit and mud-water separation unit link to each other, mud-water separation unit separates out marsh gas and gets into marsh gas and burn and utilize the unit and handle;
the main equipment of the water inlet and circulation unit comprises an anaerobic water inlet pump, a filter and an anaerobic circulating pump, wherein a water outlet pipe of the anaerobic water inlet pump is connected with the filter, and a water outlet pipe of the filter is connected with a water inlet pipe of the anaerobic circulating pump;
the main equipment of the anaerobic reactor unit comprises an anaerobic reactor mixed reaction zone, a stirrer and an ascending sludge bed reaction zone, wherein anaerobic type activated sludge is arranged in the anaerobic reactor mixed reaction zone and the ascending sludge bed reaction zone, a water outlet pipe of an anaerobic circulating pump is connected to the top of the anaerobic reactor mixed reaction zone, a water inlet pipe of the anaerobic circulating pump is communicated with the ascending sludge bed reaction zone, the bottom of the anaerobic reactor mixed reaction zone is provided with the stirrer for stirring and propelling, and the stirrer pushes sludge-water mixed liquid to the ascending sludge bed reaction zone through a bottom communicating port;
the main equipment of the mud-water separation unit comprises a three-phase separator, and the upper part of the ascending sludge bed reaction zone is connected with the three-phase separator;
the main equipment of the biogas incineration utilization unit comprises a biogas fan and a biogas incineration torch, wherein the top of the three-phase separator and the top of the mixed reaction zone of the anaerobic reactor are connected with a biogas pipeline and sent into the biogas fan, and the biogas fan is connected with the biogas incineration torch.
Preferably, the anaerobic water inlet pump, the anaerobic circulating pump and the biogas fan are all connected with a second same standby device in parallel.
Preferably, the anaerobic water inlet pump and the anaerobic circulating pump are variable frequency pumps so as to control the ratio of the water inlet amount to the circulating amount.
Preferably, the volume ratio of anaerobic water inflow to anaerobic circulation flow is controlled to be 1: 8-16, mixing and diluting anaerobic inlet water by controlling circulation, so that the impact load resistance of a UASB system can be improved, meanwhile, raw water is mixed with turbulent flow of muddy water mixed liquor in a reaction area by a circulating pump, and complete mixing, contact and degradation of anaerobic activated sludge microorganisms and the raw water are increased;
preferably, the anaerobic reactor unit is divided into two compartments, and has the following functions: respectively a mixed reaction zone and an ascending sludge bed reaction zone. Have the bottom to lead to the mouth between two check, mix the agitator that the reaction zone bottom was equipped with stirring and plug flow function, two angles of the sludge blanket reaction zone cell body that rises are raised and are leaned on inwards, are convenient for arrange mud, and anaerobic reactor top is equipped with positive negative pressure protector.
Preferably, the anaerobic reactor unit is divided into two grids, the length-width ratio of each grid is 1: 1-2, and the width-height ratio of each grid is 1: 1.2 to 2.0. The stirrer is required to form fan-shaped plug flow at the bottom, and can push the mud-water mixed liquid in the mixed reaction area to the ascending sludge bed reaction area through the bottom communication port.
Preferably, the inlet water of the anaerobic circulating pump is taken from the bottom of the upflow sludge blanket reaction zone, and the outlet water of the circulating pump is connected to the top of the anaerobic mixing reaction zone. Through the anaerobic reaction internal circulation, the impact resistance of an anaerobic system to the change of the quality and the quantity of inlet water is greatly improved, the contact reaction area and the reaction time of the leachate and anaerobic activated sludge are greatly improved, and the degradation and the conversion of pollutants in the leachate by an anaerobic process are enhanced.
Preferably, the main equipment of the mud-water separation unit is a three-phase separator. The anaerobic reactor is positioned at the upper part of an ascending sludge bed reaction zone of the anaerobic reactor and is connected with an anaerobic reactor unit, the ascending methane and sludge-water mixed liquor are treated by a three-phase separator through the methane incineration and utilization unit, the anaerobic activated sludge is separated and falls back to the ascending sludge bed reaction zone, and the separated treated sewage enters a subsequent sewage treatment unit through a water outlet pipe.
Preferably, the biogas incineration utilization unit mainly comprises a biogas fan, an incineration torch and an auxiliary automatic control system thereof. The improved UASB device system adopts positive pressure operation for methane conveying and incineration, when the anaerobic reactor generates a large amount of methane, the automatic control system monitors that the pressure is greater than the surrounding environment, and after the methane concentration in the methane meets the ignition requirement, the methane fan is started to convey and the torch automatically ignites and incinerates.
By adopting the device system, the water inlet and anaerobic circulation unit is connected with the inlet end of an anaerobic circulation pump through a tee joint after leachate is lifted by a water inlet pump and then is filtered by a filter to remove impurities and floating materials, the water inlet and the anaerobic circulation unit are connected with the inlet end of the anaerobic circulation pump after being mixed with sludge-water mixed liquid, the water is communicated to the top of a mixed reaction zone of the anaerobic reactor unit through a water outlet pipe of the anaerobic circulation pump, then water flows from top to bottom, is stirred and pushed by a stirrer arranged at the bottom of the tank when flowing to the bottom of the tank, is pushed to an ascending sludge bed reaction zone of the anaerobic reactor unit through a bottom communicating port, then flows from bottom to top, and then is separated into biogas, anaerobic activated sludge and supernatant through a three-phase separator after flowing to the top, and respectively enters a biogas incineration system, and then falls back to the ascending sludge bed and overflows to enter a next treatment unit.
The utility model discloses a filtration liquid processing method of improved generation UASB system, including following step:
(1) water inflow: through anaerobism intake pump and anaerobism circulating pump, the volume ratio of the muddy water mixture discharge volume of the inflow of control anaerobism intake pump and anaerobism circulating pump is 1: 8-16, mixing the percolate to ensure that the sewage is completely mixed and contacted with the anaerobic activated sludge;
(2) reaction: connecting a water outlet pipe of the anaerobic circulating pump in the step (1) to the top of a mixed reaction zone of the anaerobic reactor, carrying out flow reaction on water flow from top to bottom, controlling the descending flow velocity to be 0.96-2.54 m/h, stirring and pushing the water flow by a stirrer arranged at the bottom of the anaerobic reactor after reaching the bottom of the anaerobic reactor, and entering an ascending sludge bed reaction zone of the anaerobic reactor through a bottom communication port, controlling the ascending flow velocity of the water flow in the ascending sludge bed reaction zone to be 0.12-0.32 m/h, controlling the reaction temperature in the system to be 20-38 ℃, controlling the pH to be 6.5-8.5, controlling the concentration of anaerobic type active sludge to be 15-30 g/L, and carrying out further high-efficiency anaerobic reaction on organic pollutants in sewage in the reaction zone;
(3) separation: and (3) introducing the mixed liquid of the marsh gas and the muddy water generated in the step (2) into a three-phase separator at the upper part of the anaerobic reactor for gas, liquid and solid separation, introducing separated water into a subsequent treatment unit, and delivering the marsh gas into a marsh gas incineration utilization system through a marsh gas fan for incineration treatment.
Preferably, the effluent of the anaerobic water inlet pump preferentially enters a filter with the aperture of 1mm for filtering, and is mixed after fine impurities in the leachate are removed by connecting the effluent of the anaerobic water inlet pump to a water inlet of an anaerobic circulating pump.
Preferably, the volume ratio of anaerobic water inflow to circulating volume is controlled to be 1: 10-12.
Preferably, the anaerobic temperature is controlled to be 28-32 ℃, the pH value is controlled to be 6.8-7.2, and the concentration of anaerobic activated sludge is 18-25 g/L.
The utility model has the advantages that:
1. the sewage and the anaerobic activated sludge are mixed and diluted in the anaerobic circulating pump, so that the sewage is uniformly mixed with the anaerobic activated sludge primarily and is treated in advance, and the sewage is secondarily stirred by the stirrer, so that the mixing is more uniform, and the treatment effect is better; the sewage and the anaerobic activated sludge are in the treatment capacity range of the anaerobic reactor unit and the sludge-water separation unit according to the proportion of the sewage and the anaerobic activated sludge entering the anaerobic circulating pump, so that the problem of weak impact resistance in the percolate industry of the traditional UASB is solved, the impact resistance load of the UASB system is improved, the water inlet requirements of different percolate water quality conditions can be met, and the COD fluctuation range is 3500 mg/L-100000 mg/L.
2. By setting the functions of water inlet circulating mixing and anaerobic reactor cell division, the contact time and contact surface of anaerobic activated sludge and leachate in the system are improved, and the volume load and treatment efficiency of the anaerobic reactor are improved.
3. Through anaerobic reactor function blocking, bottom installation agitator and setting up the inclination have solved the siltation of anaerobic type activated sludge in reactor bottom corner, have avoided the dead volume and the dead angle of reaction process, through stirring the vortex simultaneously, have increased sewage and anaerobic type activated sludge's contact reaction, mention the treatment effect, have solved the low condition of traditional UASB reaction efficiency.
4. Through setting up the anaerobism inner loop, make sewage have different rivers velocity in mixed reaction zone and ascending sludge blanket reaction zone, and the muddy water mixture that has anaerobism type activated sludge in the ascending sludge blanket reaction zone gets into the anaerobism circulating pump through the inlet tube of anaerobism circulating pump and advances the circulation, the triphase separator burden has been alleviateed in the triphase separator separation process, the mud condition has been avoided running, the anaerobism type activated sludge entrapment rate has been improved, avoid anaerobism type activated sludge along with the anaerobism play water loss condition, the anaerobism type activated sludge stock in the system has been improved, volume load and marsh gas production rate.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following specific examples and figures.
Fig. 1 is a schematic diagram of the overall structure of an improved UASB system according to the present invention;
fig. 2 is a sectional view of the anaerobic reactor unit of the present invention.
In the figure: 1-anaerobic water inlet pump; 2-a filter; 3-a three-way connecting pipe; 4-anaerobic circulating pump; 5-an anaerobic reactor mixed reaction zone; 6-a stirrer; 7-ascending sludge bed reaction zone; 8-a three-phase separator; 9-a biogas fan; 10-biogas burning torch.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1: as shown in fig. 1-2, the utility model discloses an improved UASB system, which comprises a water inlet and anaerobic circulation unit, an anaerobic reactor unit, a mud-water separation unit and a biogas incineration utilization unit, wherein the water inlet and circulation unit is connected with the anaerobic reactor unit, the anaerobic reactor unit is connected with the mud-water separation unit, and the mud-water separation unit separates out biogas and enters the biogas incineration utilization unit for treatment;
the main equipment of the water inlet and circulation unit comprises an anaerobic water inlet pump 1, a filter 2 and an anaerobic circulation pump 4, wherein a water outlet pipe of the anaerobic water inlet pump 1 is connected with the filter 2, and a water outlet pipe of the filter 2 is connected with a water inlet pipe of the anaerobic circulation pump 4 through a three-way connecting pipe 3;
the main equipment of the anaerobic reactor unit comprises a mixed reaction zone 5, a stirrer 6 and an ascending sludge bed reaction zone 7, anaerobic type activated sludge is arranged in the mixed reaction zone 5 and the ascending sludge bed reaction zone 7 of the anaerobic reactor, a water outlet pipe of an anaerobic circulating pump 4 is connected to the top of the mixed reaction zone 5 of the anaerobic reactor, a water inlet pipe of the anaerobic circulating pump 4 is communicated with the bottom of the ascending sludge bed reaction zone 7, the stirrer 6 for stirring and propelling is arranged at the bottom of the mixed reaction zone 5 of the anaerobic reactor, and the stirrer 6 propels water to the ascending sludge bed reaction zone 7 through a bottom communicating port;
the main equipment of the mud-water separation unit comprises a three-phase separator 8, and the upper part of the ascending sludge bed reaction zone 7 is connected with the three-phase separator 8;
the main equipment of the biogas incineration utilization unit comprises a biogas fan 9 and a biogas incineration torch 10, the top of the three-phase separator 8 and the top of the anaerobic reactor mixed reaction zone 5 are connected with a biogas pipeline and sent into the biogas fan 9, and the biogas fan 9 is connected with the biogas incineration torch 10.
Specifically, an anaerobic water inlet pump 1, an anaerobic circulating pump 4 and a biogas fan 9 are connected in parallel with a second identical standby device, the anaerobic water inlet pump 1 and the anaerobic circulating pump 4 are frequency conversion pumps so as to control the ratio of water inflow to circulating flow, a water outlet pipe of a filter 2 is connected to a water inlet pipe of the anaerobic circulating pump 4 through a three-way connecting pipe 3, a water outlet pipe of the anaerobic circulating pump 4 is communicated to the top of an anaerobic reactor mixed reaction zone 5, a water inlet pipe of the anaerobic circulating pump 4 is communicated with the bottom of an ascending sludge bed reaction zone 7, a stirrer 6 is arranged at the bottom of the anaerobic reactor mixed reaction zone 5, the stirrer 6 pushes water to the ascending sludge bed reaction zone 7 through a bottom connecting port, two corners of a cell body of the ascending sludge bed reaction zone 7 are lifted and inclined inwards, so that sludge is discharged conveniently, specifically, the cell body is square, and two corners of the four corners worry about dead corners, and 3, depositing anaerobic activated sludge, namely depositing the sludge to become dead sludge at the moment, so that the sludge is made into an inclined sludge convenient to discharge, the upper part of the ascending sludge bed reaction zone 7 is connected with a three-phase separator 8 of the sludge-water separation unit, the top of the three-phase separator 8 and the top of the anaerobic reactor mixed reaction zone 5 are connected with a biogas pipeline and sent into a biogas fan 9, and the biogas fan 9 is connected with a biogas incineration torch 10. The anaerobic activated sludge separated by the three-phase separator 8 falls back to the ascending sludge bed reaction zone 7 and is supplemented back to the system, and the supernatant separated by the three-phase separator 8 overflows to the next sewage treatment unit.
The utility model discloses a filtration liquid processing method of improved generation UASB system, including following step:
(1) water inflow: through anaerobism intake pump and anaerobism circulating pump, the volume ratio of the muddy water mixture discharge volume of the inflow of control anaerobism intake pump and anaerobism circulating pump is 1: 8-16, mixing the percolate to ensure that the sewage is completely mixed and contacted with the anaerobic activated sludge;
(2) reaction: connecting a water outlet pipe of the anaerobic circulating pump in the step (1) to the top of a mixed reaction zone of the anaerobic reactor, carrying out flow reaction on water flow from top to bottom, controlling the descending flow velocity to be 0.96-2.54 m/h, stirring and pushing the water flow by a stirrer arranged at the bottom of the anaerobic reactor after reaching the bottom of the anaerobic reactor, and entering an ascending sludge bed reaction zone of the anaerobic reactor through a bottom communication port, controlling the ascending flow velocity of the water flow in the ascending sludge bed reaction zone to be 0.12-0.32 m/h, controlling the reaction temperature in the system to be 20-38 ℃, controlling the pH to be 6.5-8.5, controlling the concentration of anaerobic type active sludge to be 15-30 g/L, and carrying out further high-efficiency anaerobic reaction on organic pollutants in sewage in the reaction zone;
(3) separation: and (3) introducing the mixed liquid of the marsh gas and the muddy water generated in the step (2) into a three-phase separator at the upper part of the anaerobic reactor for gas, liquid and solid separation, introducing separated water into a subsequent treatment unit, and delivering the marsh gas into a marsh gas incineration utilization system through a marsh gas fan for incineration treatment.
Example 2:
an anaerobic treatment method for percolate with COD 78000mg/L and BOD545200mg/L, the modified UASB device system of example 1 was used, comprising the following steps:
firstly, water inlet: anaerobic water inlet pump is used for controlling anaerobic water inlet to be 10m3The water outlet of the water inlet pump is filtered by a 1mm basket filter and then is connected with a water inlet pipe of the anaerobic circulating pump, and the water quantity of the anaerobic circulating pump is controlled to be 100m3And h (namely water inlet: circulation: 1:10), and performing mixed treatment on the percolate.
Secondly, reaction: in the first step, a water outlet pipe of a circulating pump is connected to the top of a mixed reaction zone of the anaerobic reactor, water flows from top to bottom for reaction, the descending flow rate is 1.2m/h, the water reaches the bottom of the reactor and is stirred and pushed by a stirrer arranged at the bottom of the reactor, the water enters an ascending sludge bed reaction zone of the anaerobic reactor through a bottom communicating port, the ascending flow rate of the water is 0.15m/h, the reaction temperature in the anaerobic reactor system is controlled to be 32 ℃, the pH value is 7.0, and the concentration of anaerobic activated sludge is 20 g/L. Organic pollutants in the sewage are subjected to further high-efficiency anaerobic reaction in the reactor;
thirdly, separation: and in the second step, the mixed liquid of the marsh gas and the muddy water generated by the reaction enters an anaerobic reactor and rises to a three-phase separator at the upper part of a sludge bed reaction area for gas, liquid and solid separation, the separated water enters a subsequent treatment unit, and the generated gas is sent to a marsh gas burning utilization system for burning treatment through a marsh gas fan. After the improved UASB process treatment, the COD of the leachate anaerobic treatment effluent is 10600mg/L, the COD removal rate is 86.4 percent, and the BOD54150mg/L, the removal rate is 90.82%, the methane content in the generated biogas is 73%, and the anaerobic activated sludge concentration in the anaerobic system is 22 g/L.
Example 3: a method for anaerobic treatment of leachate, which differs from example 2 in that:
1. the water quality of raw percolate water is COD 28000mg/L and BOD514800mg/L, modified UASB device system of example 1 was used;
2. the volume ratio of the water inflow to the circulating flow is controlled to be 1:12, the descending flow rate is 2.54m/h, the ascending flow rate is 0.21m/h, the anaerobic reaction temperature is 32 ℃, and the pH value is 7.3.
The anaerobic effluent after treatment is as follows: the COD is 2100mg/L, the COD removal rate is 92.5 percent, and the BOD51260mg/L, the removal rate is 91.49%, the methane content in the generated biogas is 70.5%, and the anaerobic activated sludge concentration in the anaerobic system is 18 g/L.
Comparative example 1: the anaerobic treatment method of percolate is different from that of example 1 in that the quality of raw water of percolate is 52000mg/L COD and BOD531200mg/L, the modified UASB plant system from example 1 was used, the volume ratio of the feed to the circulation was 1:4, the flow rate was decreased by 1.25m/h, the flow rate was increased by 0.31m/h, the anaerobic reaction temperature was 32 ℃ and the pH was 7.0. The anaerobic effluent after treatment is as follows: the COD is 24000mg/L, the removal rate of the COD is 53.85 percent, and the BOD513460mg/L, the removal rate is 56.86%, the methane content in the produced biogas is 58%, and the anaerobic activated sludge concentration in the anaerobic system is 13.4 g/L.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. An improved UASB system, comprising: the sewage treatment system comprises a water inlet and anaerobic circulation unit, an anaerobic reactor unit, a mud-water separation unit and a methane incineration utilization unit, wherein the water inlet and circulation unit is connected with the anaerobic reactor unit, the anaerobic reactor unit is connected with the mud-water separation unit, and methane separated by the anaerobic reactor unit and the mud-water separation unit enters the methane incineration utilization unit for treatment;
the main equipment of the water inlet and circulation unit comprises an anaerobic water inlet pump, a filter and an anaerobic circulating pump, wherein a water outlet pipe of the anaerobic water inlet pump is connected with the filter, and a water outlet pipe of the filter is connected with a water inlet pipe of the anaerobic circulating pump;
the main equipment of the anaerobic reactor unit comprises an anaerobic reactor mixed reaction zone, a stirrer and an ascending sludge bed reaction zone, wherein anaerobic type activated sludge is arranged in the anaerobic reactor mixed reaction zone and the ascending sludge bed reaction zone, a water outlet pipe of an anaerobic circulating pump is connected to the top of the anaerobic reactor mixed reaction zone, a water inlet pipe of the anaerobic circulating pump is communicated with the bottom of the ascending sludge bed reaction zone, the bottom of the anaerobic reactor mixed reaction zone is provided with the stirrer for stirring and propelling, and the stirrer pushes sludge-water mixed liquid to the ascending sludge bed reaction zone through a bottom communicating port;
the main equipment of the mud-water separation unit comprises a three-phase separator, and the upper part of the ascending sludge bed reaction zone is connected with the three-phase separator;
the main equipment of the biogas incineration utilization unit comprises a biogas fan and a biogas incineration torch, wherein the top of the three-phase separator and the top of the mixed reaction zone of the anaerobic reactor are connected with a biogas pipeline and sent into the biogas fan, and the biogas fan is connected with the biogas incineration torch.
2. An improved UASB system according to claim 1, wherein: the anaerobic water inlet pump, the anaerobic circulating pump and the biogas fan are all connected with a second same standby device in parallel.
3. An improved UASB system according to claim 1, wherein: the anaerobic water inlet pump and the anaerobic circulating pump are variable frequency pumps.
4. An improved UASB system according to claim 1, wherein: and a water outlet pipe of the filter is connected into a water inlet pipe of the anaerobic circulating pump through a tee joint.
5. An improved UASB system according to claim 1, wherein: the anaerobic reactor unit is divided into two grids, the length-width ratio of each grid is 1: 1-1.5, and the width-height ratio of each grid is 1: 1.2-2.0, which are respectively an anaerobic reactor mixed reaction zone and an ascending sludge bed reaction zone, wherein a bottom communicating port is arranged between the two grids, the bottom of the mixed reaction zone is provided with a stirrer with stirring and plug-flow functions, two corners of a tank body of the ascending sludge bed reaction zone are raised and inclined inwards, and the top of the anaerobic reactor unit is provided with a positive and negative pressure protector.
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