CN219156705U - Sewage treatment system - Google Patents

Abstract

The utility model discloses a sewage treatment system which comprises a micro-filter, a primary protein separator, a secondary protein separator, a biological floating bed and ozone equipment, wherein the micro-filter is provided with a micro-filter water inlet, a water outlet of the micro-filter is connected with the primary protein separator, a water outlet of the primary protein separator is connected with the secondary protein separator, a water outlet of the secondary protein separator is connected with the biological floating bed, an aeration system is arranged in the biological floating bed, the aeration system is connected with the ozone equipment, and the ozone equipment is used for providing ozone for the aeration system. The sewage treatment system has the advantages of simple structure, low running cost and better purifying effect.

Description

Sewage treatment system

Technical Field

The utility model relates to the field of sewage treatment equipment, in particular to a sewage treatment system.

Background

Sewage treatment is a process for purifying sewage to meet the water quality requirement of being discharged into a certain water body or reused. The sewage treatment is widely applied to various fields of buildings, agriculture, traffic, energy sources, petrifaction, environmental protection, urban landscapes, medical treatment, catering and the like, and the sewage treatment is increasingly carried into the daily life of common people. Sewage treatment is generally classified into production sewage treatment and domestic sewage treatment according to sewage sources. The production sewage includes industrial sewage, agricultural sewage, medical sewage, etc., and the domestic sewage is sewage produced in daily life, and refers to complex mixtures of various forms of inorganic matters and organic matters.

The existing sewage treatment system for aquatic product processing has high cost including investment and operation cost, so that the system is greatly restricted in popularization and application. Namely, the existing equipment for treating the aquaculture sewage is huge and complex, and has the defects of high operation cost, high technical requirements, low economic efficiency and the like.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims to provide a sewage treatment system with simple structure, low running cost and good purifying effect.

The utility model adopts the following technical scheme:

the utility model provides a sewage treatment system, includes microfilter, one-level protein separator, second grade protein separator, biological bed and ozone equipment that floats, the microfilter is equipped with the microfiltration water inlet, the delivery port of microfilter is connected one-level protein separator, one-level protein separator's delivery port is connected second grade protein separator, the delivery port of second grade protein separator is connected biological bed that floats, biological bed inside is equipped with aeration system that floats, aeration system with ozone equipment connects, ozone equipment is used for to the aeration system provides ozone.

Further, the biological floating bed comprises a floating bed barrel body, a supporting net frame is arranged at the bottom of the floating bed barrel body, the aeration system is arranged on the supporting net frame, a floating bed water inlet communicated with the secondary protein separator is arranged at the upper part of the floating bed barrel body, a floating bed water outlet pipe is connected to the lower part of the floating bed barrel body, and a floating bed water outlet is arranged at the upper part of the floating bed water outlet pipe.

Further, the aeration system comprises an aeration disc and an air inlet pipeline connected with the aeration disc, and the air inlet pipeline is connected with the ozone equipment.

Further, the biological floating bed also comprises a water distribution pipe, one end of the water distribution pipe is connected with the water inlet of the floating bed, the other end of the water distribution pipe is fixed on the inner side wall of the barrel body, and a plurality of water distribution holes are formed in the surface of the water distribution pipe.

Further, the upper part of the primary protein separator is provided with a primary water inlet connected with the water outlet of the micro-filter, a primary water passing cavity is connected between the primary protein separator and the secondary protein separator, a secondary water passing cavity is communicated between the secondary protein separator and the biological floating bed, the lower part of the primary protein separator is provided with a primary water outlet communicated with the primary water passing cavity, the upper part of the secondary protein separator is provided with a secondary water inlet communicated with the primary water passing cavity, the lower part of the secondary protein separator is provided with a secondary water outlet communicated with the secondary water passing cavity, and the upper part of the biological floating bed is provided with a floating bed water inlet communicated with the secondary water passing cavity.

Further, the primary protein separator comprises a separation barrel, a water pump, an ejector, a bubble chamber, an air pipe, a water outlet pipe and a collection chamber, wherein one end of the ejector is connected with the water pump, the other end of the ejector is connected with the bubble chamber, one end of the air pipe is connected to the ejector, the other end of the air pipe is communicated with the outside air, the collection chamber is arranged at the top of the separation barrel, a top plate of the collection chamber is connected with a water outlet pipe, one end of the water outlet pipe is connected to the lower part of the separation barrel, and a water outlet end of the water outlet pipe is connected with the water pump.

Further, the bubble chamber comprises a contact bin arranged at the bottom of the separation barrel and a compression bin communicated with the contact bin, the contact bin is provided with a water inlet, the water inlet is used for being connected with the other end of the ejector, the contact bin and the compression bin are of tubular structures with two communicated ends, the diameter of the compression bin is smaller than that of the contact bin, and the central axis of the compression bin coincides with the central axis of the contact bin.

Further, the micro-filter comprises a box body, wherein the box body is internally divided into a water storage bin, a filtering bin and a sterilizing bin which are sequentially communicated, a micro-filtering water inlet is communicated with the water storage bin, a slag removing mechanism is arranged in the filtering bin, a plurality of sterilizing lamps are arranged in the sterilizing bin, a micro-filtering water outlet is arranged at the position, corresponding to the sterilizing bin, of the box body, and the micro-filtering water outlet is communicated with the primary protein separator.

Further, the slag removing mechanism comprises a roller, a driving mechanism, a cleaning pipe and a sewage draining groove, the roller comprises a fixing frame and a filter screen wound on the fixing frame, one end of the fixing frame is provided with a liquid inlet, the liquid inlet is communicated with the water storage bin so as to guide sewage into the roller through the liquid inlet and flow out through the filter screen, and the filter screen is suitable for filtering sundries in the sewage; the driving mechanism is arranged on the side surface of the box body, and the driving end of the driving mechanism is connected with the other end of the fixing frame so as to be suitable for driving the roller to rotate; a cleaning pipe is arranged above the roller and is used for spraying liquid towards the roller so as to wash away dirt attached to the filter screen; one end of the sewage draining groove is arranged in the drum passing through the liquid inlet, the other end of the sewage draining groove is arranged outside the drum, and the sewage draining groove is suitable for receiving sewage falling from the filter screen.

Further, the slag removing mechanism further comprises a cleaning pump, a plurality of nozzles are arranged on the cleaning pipe and face the roller, the water inlet end of the cleaning pump is connected with the filtering bin, and the water outlet end of the cleaning pump is connected with the cleaning pipe.

Compared with the prior art, the utility model has the beneficial effects that:

in the utility model, sewage firstly enters the micro-filter for preliminary filtration, the filtered water sequentially passes through the first-stage protein separator and the second-stage protein separator, organic particles, proteins and harmful metal ions in the water can be effectively removed through the two-stage protein separator, the water coming out of the second-stage protein separator preferably enters the biological floating bed for purification, the biological floating bed is used for sterilizing and purifying the water body in a mode of combining aeration with ozone, the aeration can increase the dissolved oxygen of the water body, and the activity of the aerobic microorganism purified pollutants is improved, so that the aim of purifying the water body is fulfilled. The utility model has the advantages of simple structure, low running cost, good purifying effect and the like through the integrally arranged micro-filter, the primary protein separator, the secondary protein separator, the biological floating bed and the ozone equipment.

Drawings

FIG. 1 is a schematic diagram of a sewage treatment system according to the present utility model;

FIG. 2 is a cross-sectional view of a wastewater treatment system according to the present utility model;

FIG. 3 is a schematic diagram of the interior of a biological floating bed of a wastewater treatment system according to the present utility model;

FIG. 4 is a schematic diagram of a sewage treatment system according to the present utility model, not shown with a micro-filter and ozone apparatus;

FIG. 5 is a schematic diagram of the interior of a micro-filter of the sewage treatment system provided by the utility model;

in the figure: 10. a micro-filter; 101. a case; 102. a water storage bin; 103. a filtering bin; 104. a sterilizing bin; 105. a micro-filtration water inlet; 106. a micro-filtration water gap; 107. a germicidal lamp; 108. a roller; 109. a driving mechanism; 110. cleaning the tube; 111. a nozzle; 112. a cleaning pump; 113. a sewage draining groove; 20. a primary protein separator; 201. a separation barrel; 202. a water pump; 203. a jet device; 204. an air tube; 205. a water outlet pipe; 206. a collection chamber; 207. a contact bin; 208. a compression bin; 211. a primary water inlet; 212. a primary water outlet; 213. a drain pipe; 30. a secondary protein separator; 301. a second-stage water inlet; 302. a secondary water outlet; 40. a biological floating bed; 401. a floating bed barrel body; 402. a support grid; 403. a water inlet of the floating bed; 404. a floating bed water outlet pipe; 405. a water outlet of the floating bed; 406. an aeration disc; 407. an air intake duct; 408. a water distribution pipe; 409. a water distribution hole; 50. an ozone device; 60. a first-stage water passing cavity; 70. a second-stage water passing cavity.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.

In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limitations of the present utility model. Furthermore, the terms "first," "second," "one," "another," and the like, are used for distinguishing between similar elements and not intended to limit the scope of the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; either directly, indirectly, through intermediaries, or in communication with each other. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. Corresponding reference characters indicate corresponding parts throughout the several views (e.g., identical structure, functionally similar elements identified by "1XX" and "2 XX").

As shown in fig. 1-5, the sewage treatment system provided by the utility model comprises a micro-filter 10, a primary protein separator 20, a secondary protein separator 30, a biological floating bed 40 and an ozone device 50, wherein the micro-filter 10 is provided with a micro-filter water inlet 105, a water outlet of the micro-filter 10 is connected with the primary protein separator 20, a water outlet of the primary protein separator 20 is connected with the secondary protein separator 30, a water outlet of the secondary protein separator 30 is connected with the biological floating bed 40, an aeration system is arranged in the biological floating bed 40, the aeration system is connected with the ozone device 50, and the ozone device 50 is used for providing ozone for the aeration system.

In the utility model, sewage firstly enters the micro-filter 10 for preliminary filtration, the filtered water sequentially passes through the primary protein separator 20 and the secondary protein separator 30, organic particles, proteins and harmful metal ions in the water can be effectively removed through the two-stage protein separators, the water coming out of the secondary protein separator 30 preferably enters the biological floating bed 40 for purification, the biological floating bed 40 is used for sterilizing and purifying the water body in a mode of combining aeration with ozone, the aeration can increase the dissolved oxygen of the water body, and the activity of the aerobic microorganism purified pollutants is improved, so that the aim of purifying the water body is fulfilled.

Preferably, the biological floating bed 40 comprises a floating bed barrel 401, a supporting net rack 402 is arranged at the bottom of the floating bed barrel 401, the aeration system is arranged on the supporting net rack 402, a floating bed water inlet 403 communicated with the secondary protein separator 30 is arranged at the upper part of the floating bed barrel 401, a floating bed water outlet pipe 404 connected with the lower part of the floating bed barrel 401 is arranged at the upper part of the floating bed water outlet pipe 404, and a floating bed water outlet 405 is arranged at the upper part of the floating bed water outlet pipe 404.

In the present utility model, the aquatic plants planted on the support net frame 402 are fed from the top to the bottom of the floating bed drum 401 from the water discharged from the secondary protein separator 30, and the purified water is discharged from the floating bed water outlet pipe 404 at the bottom.

Preferably, the aeration system comprises an aeration disc 406 and an air inlet pipe 407 connected with the aeration disc 406, wherein the air inlet pipe 407 is connected with the ozone apparatus 50.

In the utility model, by introducing ozone into the aeration disc 406, the sludge, suspended matters and the like attached to the aeration disc 406 can be effectively washed down, the problem of blocking the holes of the aeration disc 406 is solved, the aeration resistance is reduced, the energy consumption is reduced, and the ozone distribution is more uniform. The aeration disc 406 has even gas distribution and high gas-liquid mass transfer efficiency, and can effectively improve the sewage treatment and purification effect.

Preferably, the biological floating bed 40 further comprises a water distribution pipe 408, one end of the water distribution pipe 408 is connected with the water inlet 403 of the floating bed, the other end of the water distribution pipe 408 is fixed on the inner side wall of the barrel body, and a plurality of water distribution holes 409 are formed in the water distribution pipe 408 along the length direction thereof.

In the utility model, the water distribution pipe 408 is positioned at the upper part of the floating bed barrel 401, water from the secondary protein separator 30 flows into the water distribution pipe 408 and is sprayed downwards into the floating bed barrel 401 from the water distribution holes 409, and the water distribution holes 409 are arranged to spray the aquatic plants planted on the support net frame 402, so that the use function of the water distribution pipe 408 is increased.

Preferably, a primary water inlet 211 connected with the water outlet of the micro-filter 10 is arranged at the upper part of the primary protein separator 20, a primary water passing cavity 60 is connected between the primary protein separator 20 and the secondary protein separator 30, a secondary water passing cavity 70 is communicated between the secondary protein separator 30 and the biological floating bed 40, a primary water outlet 212 communicated with the primary water passing cavity 60 is arranged at the lower part of the primary protein separator 20, a secondary water inlet 301 communicated with the primary water passing cavity 60 is arranged at the upper part of the secondary protein separator 30, a secondary water outlet 302 communicated with the secondary water passing cavity 70 is arranged at the lower part of the secondary protein separator 30, and a floating bed water inlet 403 communicated with the secondary water passing cavity 70 is arranged at the upper part of the biological floating bed 40.

In the utility model, the primary protein separator 20 and the secondary protein separator 30 are communicated through the primary water passing cavity 60, the secondary water passing cavity 70 is communicated with the secondary protein separator 30 and the biological floating bed 40, in addition, in the primary protein separator 20, water flows in from top to bottom, water in the primary water passing cavity 60 is sent into the secondary protein separator 30 from bottom to top, water in the secondary protein separator 30 flows into the secondary water passing cavity 70 from top to bottom, water in the secondary water passing cavity 70 flows into the biological floating bed 40 from bottom to top, and the design of water flow direction and the purification effect are good.

Preferably, the primary protein separator 20 comprises a separation barrel 201, a water pump 202, a jet device 203, a bubble chamber, an air pipe 204, a water outlet pipe 205 and a collection chamber 206, wherein one end of the jet device 203 is connected with the water pump 202, the other end of the jet device 203 is connected with the bubble chamber, the air pipe 204 is connected with the jet device 203, the top of the air pipe 204 is communicated with the outside air, the collection chamber 206 is arranged at the top of the separation barrel 201, a water outlet pipe 213 is connected to the top plate of the collection chamber 206, one end of the water outlet pipe 205 is connected to the lower part of the separation barrel 201, and the water outlet end of the water outlet pipe 205 is connected with the water pump 202.

In the utility model, the effluent of the water pump 202 flows into the ejector 203, the water generates a negative pressure area through the ejector 203, the air pipe 204 positioned in the negative pressure area sucks air, the sucked air and water are mixed in the ejector 203 to generate a large amount of tiny micro-bubbles, because the specific surface area of the tiny micro-bubbles is contacted with the water, oxygen in the bubbles can be naturally fused into the water to further increase the dissolved oxygen amount of the water, and finally the bubbles are sent into the bubble chamber from the outlet of the ejector 203, when the bubbles are contacted with organic matters, adsorption effect can be generated, protein and other insoluble organic matters in the water are collected in the collecting chamber 206 under the action of foam, and the collected organic matters are discharged from the collecting chamber 206 at the top along with the continuous generation of the micro-bubbles, so that the air pump has the advantages of removing the organic matters, high sterilization rate, health, environmental protection, simple operation, easy cleaning and convenient maintenance. The utility model adopts oxygenation and hydraulic circulation of the ejector 203 to create a suitable microorganism growth environment for microorganism oxidative decomposition, and has the advantages of good effluent quality, no need of a compressed air station, small occupied area and low operation cost.

The secondary protein separator 30 of the present utility model has the same structure as the primary protein separator 20.

Preferably, the bubble chamber comprises a contact bin 207 arranged at the bottom of the separation barrel 201 and a compression bin 208 communicated with the contact bin 207, the contact bin 207 is provided with a water inlet, the water inlet is used for being connected with the other end of the ejector 203, the contact bin 207 and the compression bin 208 are of tubular structures with two ends communicated, the diameter of the compression bin 208 is smaller than that of the contact bin 207, and the central axis of the compression bin 208 coincides with the central axis of the contact bin 207.

In the utility model, by arranging the contact bin 207 and the compression cavity, the irregularly moving bubbles form stably-ascending bubbles, and the surfaces of the bubbles are stable, so that the effective utilization rate and the treatment capacity of the protein separator are improved, the treatment capacity effect of the protein separator is better, and the energy is saved.

Preferably, the micro-filter 10 comprises a box 101, wherein the box 101 is internally divided into a water storage bin 102, a filtering bin 103 and a sterilizing bin 104 which are sequentially communicated, the micro-filtering water inlet 105 is communicated with the water storage bin 102, a slag removing mechanism is arranged in the filtering bin 103, a plurality of sterilizing lamps 107 are arranged in the sterilizing bin 104, a micro-filtering water outlet 106 is arranged at the position, corresponding to the sterilizing bin 104, of the box 101, and the micro-filtering water outlet 106 is communicated with the primary protein separator 20.

In the utility model, a micro-filtration water inlet 105 is externally connected with a sewage inlet pipe, sewage sequentially flows through a water storage bin 102, a filtration bin 103 and a sterilization bin 104, preliminary precipitation is carried out in the water storage bin 102, sundry filtration is carried out in the filtration bin 103, sterilization and purification are carried out on water in the sterilization bin 104 through a sterilization lamp 107, and the sterilized water is sent into a primary protein separator 20. The germicidal lamp 107 may be an ultraviolet germicidal lamp 107.

Preferably, the slag removing mechanism comprises a roller 108, a driving mechanism 109, a cleaning pipe 110 and a sewage draining groove 113, wherein the roller 108 comprises a fixing frame and a filter screen wound on the fixing frame, one end of the fixing frame is provided with a liquid inlet, the liquid inlet is communicated with the water storage bin 102 so as to guide sewage into the roller 108 through the liquid inlet and flow out through the filter screen, and the filter screen is suitable for filtering sundries in the sewage; the driving mechanism 109 is mounted on the side surface of the box body 101, and the driving end of the driving mechanism 109 is connected with the other end of the fixing frame so as to be suitable for driving the cylinder 108 to rotate; a cleaning pipe 110 is disposed above the drum 108, the cleaning pipe 110 being for spraying liquid toward the drum 108 to wash out dirt attached to the filter screen; a drain tank 113 is disposed at one end through the liquid inlet and inside the drum 108, and at the other end outside the drum 108, and the drain tank 113 is adapted to receive dirt falling from the filter screen.

In the utility model, the water in the water storage bin 102 is led into the fixing frame through the liquid inlet, so that sewage can be filtered through the filter screen arranged outside the fixing frame; the actuating mechanism 109 that sets up can drive the cylinder 108 and rotate to order about the filter screen and rotate, with changing filtering position, avoid fish pond filth to concentrate in filter screen one department, the wash pipe 110 of setting can spray liquid towards cylinder 108 at cylinder 108 rotation in-process, with dash the filth of attaching at the filter screen internal surface, too much filth remains on the filter screen when avoiding long-time use, influence filter effect and efficiency, and make the internal surface with the filter screen of sewage contact part not exist or exist less filth, the filter effect is good, the blowdown groove 113 of setting can receive wash pipe 110 to dash down the filth, avoid the filth to fall back to the filter screen again.

Preferably, the slag removing mechanism further comprises a cleaning pump 112, the cleaning pipe 110 is provided with a plurality of nozzles 111, the nozzles 111 are arranged towards the drum 108, the water inlet end of the cleaning pump 112 is connected with the filtering bin 103, and the water outlet end of the cleaning pump 112 is connected with the cleaning pipe 110. The water in the filter bin 103 is pumped to the cleaning pipe 110 by the cleaning pump 112, and the drum 108 is sprayed by the nozzle 111, so that the water is recycled, and the energy is saved.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (10)

1. The utility model provides a sewage treatment system, its characterized in that includes microfilter (10), one-level protein separator (20), second grade protein separator (30), biological floating bed (40) and ozone equipment (50), microfilter (10) are equipped with microfiltration water inlet (105), the delivery port of microfilter (10) is connected one-level protein separator (20), the delivery port of one-level protein separator (20) is connected second grade protein separator (30), the delivery port of second grade protein separator (30) is connected biological floating bed (40), biological floating bed (40) inside is equipped with aeration system, aeration system with ozone equipment (50) are connected, ozone equipment (50) are used for to the ozone is provided to aeration system.

2. The sewage treatment system according to claim 1, wherein the biological floating bed (40) comprises a floating bed barrel body (401), a supporting net frame (402) is arranged at the inner bottom of the floating bed barrel body (401), the aeration system is arranged on the supporting net frame (402), a floating bed water inlet (403) communicated with the secondary protein separator (30) is arranged at the upper part of the floating bed barrel body (401), a floating bed water outlet pipe (404) is connected to the lower part of the floating bed barrel body (401), and a floating bed water outlet (405) is arranged at the upper part of the floating bed water outlet pipe (404).

3. The sewage treatment system according to claim 2, wherein the aeration system comprises an aeration disc (406) and an air inlet pipe (407) connected to the aeration disc (406), the air inlet pipe (407) being connected to the ozone apparatus (50).

4. A sewage treatment system according to claim 3, wherein the biological floating bed (40) further comprises a water distribution pipe (408), one end of the water distribution pipe (408) is connected with the water inlet (403) of the floating bed, the other end of the water distribution pipe (408) is fixed on the inner side wall of the barrel body, and a plurality of water distribution holes (409) are formed in the surface of the water distribution pipe (408).

5. The sewage treatment system according to claim 1, wherein a primary water inlet (211) connected with a water outlet of the micro-filter (10) is arranged at the upper part of the primary protein separator (20), a primary water passing cavity (60) is connected between the primary protein separator (20) and the secondary protein separator (30), a secondary water passing cavity (70) is communicated between the secondary protein separator (30) and the biological floating bed (40), a primary water outlet (212) communicated with the primary water passing cavity (60) is arranged at the lower part of the primary protein separator (20), a secondary water inlet (301) communicated with the primary water passing cavity (60) is arranged at the upper part of the secondary protein separator (30), a secondary water outlet (302) communicated with the secondary water passing cavity (70) is arranged at the lower part of the secondary protein separator (30), and a floating bed water inlet (403) communicated with the secondary water passing cavity (70) is arranged at the upper part of the biological floating bed (40).

6. The sewage treatment system according to claim 1, wherein the primary protein separator (20) comprises a separation barrel (201), a water pump (202), a jet ejector (203), a bubble chamber, an air pipe (204), a water outlet pipe (205) and a collection chamber (206), one end of the jet ejector (203) is connected with the water pump (202), the other end of the jet ejector (203) is connected with the bubble chamber, one end of the air pipe (204) is connected with the jet ejector (203), the other end of the air pipe (204) is communicated with the outside air, the collection chamber (206) is arranged at the top of the separation barrel (201), a top plate of the collection chamber (206) is connected with a water outlet pipe (213), one end of the water outlet pipe (205) is connected below the separation barrel (201), and a water outlet end of the water outlet pipe (205) is connected with the water pump (202).

7. The sewage treatment system according to claim 6, wherein the bubble chamber comprises a contact chamber (207) arranged at the bottom of the separation barrel (201) and a compression chamber (208) communicated with the contact chamber (207), the contact chamber (207) is provided with a water inlet, the water inlet is used for being connected with the other end of the ejector (203), the contact chamber (207) and the compression chamber (208) are of tubular structures with two communicated ends, the diameter of the compression chamber (208) is smaller than that of the contact chamber (207), and the central axis of the compression chamber (208) coincides with the central axis of the contact chamber (207).

8. The sewage treatment system according to claim 1, wherein the micro-filter (10) comprises a box body (101), the box body (101) is internally divided into a water storage bin (102), a filtering bin (103) and a sterilizing bin (104) which are sequentially communicated, the micro-filtering water inlet (105) is communicated with the water storage bin (102), a slag removing mechanism is arranged in the filtering bin (103), a plurality of sterilizing lamps (107) are arranged in the sterilizing bin (104), a micro-filtering water outlet (106) is arranged at a position, corresponding to the sterilizing bin (104), of the box body (101), and the micro-filtering water outlet (106) is communicated with the primary protein separator (20).

9. The sewage treatment system according to claim 8, wherein the slag removal mechanism comprises a roller (108), a driving mechanism (109), a cleaning pipe (110) and a sewage draining groove (113), the roller (108) comprises a fixing frame and a filter screen wound on the fixing frame, one end of the fixing frame is provided with a liquid inlet, the liquid inlet is communicated with the water storage bin (102) so as to guide sewage into the roller (108) through the liquid inlet and flow out through the filter screen, and the filter screen is suitable for filtering sundries in the sewage; the driving mechanism (109) is arranged on the side surface of the box body (101), and the driving end of the driving mechanism (109) is connected with the other end of the fixing frame so as to be suitable for driving the roller (108) to rotate; a cleaning tube (110) is arranged above the drum (108), the cleaning tube (110) being used for spraying liquid towards the drum (108) to wash away dirt attached to the filter screen; a drain tank (113) is arranged at one end of the drain tank (113) penetrating through the liquid inlet and arranged in the roller (108), and the other end of the drain tank is arranged outside the roller (108), and the drain tank (113) is suitable for receiving dirt falling from the filter screen.

10. The sewage treatment system according to claim 9, wherein the slag removal mechanism further comprises a cleaning pump (112), a plurality of nozzles (111) are arranged on the cleaning pipe (110), the nozzles (111) are arranged towards the drum (108), a water inlet end of the cleaning pump (112) is connected with the filtering bin (103), and a water outlet end of the cleaning pump (112) is connected with the cleaning pipe (110).

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