CN212770263U

CN212770263U - Sewage treatment system

Info

Publication number: CN212770263U
Application number: CN202021194331.0U
Authority: CN
Inventors: 陈洁; 赵鹏飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-03-23
Anticipated expiration: 2030-06-24

Abstract

The utility model relates to a sewage treatment system, which is characterized by comprising a filtering unit, a photocatalysis unit and a gas-liquid separator; the upper end and the lower end of one side of the filtering unit are respectively connected with a sewage feeding pipeline and a back flushing liquid discharging pipeline, the filtering unit, the photocatalytic unit and the gas-liquid separator are sequentially communicated through connecting pipelines, a liquid outlet of the gas-liquid separator is connected with a liquid outlet pipeline, and the liquid outlet pipeline is communicated with the connecting pipeline between the filtering unit and the photocatalytic unit through a back cleaning pipeline; before the photocatalytic treatment, the whole sewage is subjected to impurity removal, precipitation and speed reduction through the filtering unit, so that the load of the photocatalytic treatment is reduced, the photocatalytic treatment device is protected, the sewage treatment effect is improved, and the cost of sewage treatment is reduced; after the treatment is finished, the filter assembly can be subjected to backwashing treatment through the treated water, so that a higher filtering effect is ensured when the filter assembly filters at each time.

Description

Sewage treatment system

Technical Field

The utility model discloses sewage treatment technical field, specificly relates to a sewage treatment system.

Background

Along with the increase of urban population, the expansion of residential areas and the further concentration of population in China, the domestic water consumption is increased, and the sewage quantity discharged by cities is increased more and more. The urban domestic sewage is mainly composed of kitchen washing, toilet flushing, bathing, laundry water and the like, and organic nitrogen and ammonia nitrogen contained in the sewage are mainly derived from wastes such as feces and the like of protein metabolism in human food. At present, urban domestic sewage becomes a main pollution source of urban water in China, and the existing sewage treatment facilities are difficult to bear increasing sewage treatment amount every day, so that a large amount of domestic sewage is discharged into rivers and lakes without being purified to pollute natural water bodies and surrounding environments. A large amount of sewage is directly discharged, so that not only is the ecology damaged, but also the industrial and agricultural production and the health and the safety of human beings are seriously harmed. Therefore, the treatment of urban domestic sewage is the central importance in the current and future urban water environment protection work, and the standard discharge of the domestic sewage becomes a problem to be solved urgently in the current society.

Because most of traditional sewage treatment methods are insufficient in treatment degree and easy to cause secondary pollution, and the photocatalytic sewage treatment is a new sewage treatment technology, compared with the traditional sewage purification treatment technology, the photocatalytic sewage treatment technology can thoroughly degrade organic pollutants, cannot cause secondary pollution to the environment, is low in treatment cost and high in reaction rate, and can better solve the defects existing in the traditional sewage treatment technology.

However, when sewage treatment is carried out at present, the generated sewage is directly introduced into a processor for treatment, and because the load of photocatalytic reaction is larger due to no primary treatment, impurities in the sewage easily cause damage to the photocatalytic processor, the cost of sewage treatment is increased, and the efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a sewage treatment system which can treat sewage before photocatalytic treatment and can carry out backwashing after the treatment.

In order to achieve the purpose, the utility model adopts the following technical proposal that the sewage treatment system is characterized by comprising a filtering unit, a photocatalysis unit and a gas-liquid separator;

the upper end and the lower end of one side of the filtering unit are respectively connected with a sewage feeding pipeline and a back flushing liquid discharging pipeline, the filtering unit, the photocatalytic unit and the gas-liquid separator are sequentially communicated through a connecting pipeline, a liquid outlet of the gas-liquid separator is connected with a liquid outlet pipeline, and the liquid outlet pipeline is communicated with the connecting pipeline between the filtering unit and the photocatalytic unit through a back cleaning pipeline;

the backwashing pipeline is communicated with the liquid outlet pipeline through a first three-way valve, and the backwashing pipeline is communicated with a connecting pipeline between the filtering unit and the photocatalytic unit through a second three-way valve; a back washing pump for pumping the liquid separated from the gas-liquid separator into the filtering unit is arranged on the back washing pipeline;

and a gas outlet of the gas-liquid separator is communicated with a gas outlet pipeline.

The filtering unit comprises a filtering box body and a filtering partition plate arranged in the filtering box body, wherein the upper end of the filtering partition plate is fixedly and hermetically connected with the top of the filtering box body, and a gap is formed between the lower end of the filtering partition plate and the bottom of the filtering box body;

a sewage inlet and a backwashing outlet which are connected with a sewage adding pipeline and a backwashing liquid discharge pipeline are arranged on the filtering box body on one side of the filtering partition plate, and the sewage inlet is positioned above the backwashing outlet;

a filter assembly is arranged between the other side of the filter partition plate and the filter box body, and a filtrate outlet connected with a connecting pipeline is arranged on the filter box body above the filter assembly;

the bottom of the filtering box body is in the shape of an arc groove, and the lowest part of the arc groove is positioned under the filtering partition plate.

The photocatalytic unit comprises a photocatalytic box body, a filtered water inlet and a photocatalytic water outlet which are arranged at two sides of the photocatalytic box body; the filtered water inlet and the photocatalytic water outlet are respectively communicated with the filtering unit and the gas-liquid separator through connecting pipelines;

a photocatalytic baffle and a catalytic filtering baffle are arranged in the photocatalytic box body, the upper end of the photocatalytic baffle is fixedly and hermetically connected with the top of the photocatalytic box body, and a gap is formed between the lower end of the photocatalytic baffle and the bottom of the photocatalytic box body; the lower end of the catalytic filtering partition plate is fixedly and hermetically connected with the bottom of the photocatalytic box body, and a gap is formed between the upper end of the catalytic filtering partition plate and the top of the photocatalytic box body;

the two side surfaces of the photocatalytic clapboard are provided with a plurality of photocatalytic lamps, and the inner wall of the photocatalytic box body and the end surface of the catalytic filtering clapboard which are opposite to the photocatalytic clapboard are provided with photocatalytic surfaces;

a filter screen is arranged between the catalytic filtering baffle and the inner wall of the photocatalytic box body, and the photocatalytic water outlet is positioned below the filter screen.

A plurality of air nozzles are respectively arranged on two end faces of the photocatalytic partition board, and the air nozzles are communicated with a hollow cavity arranged in the photocatalytic partition board; the top of the photocatalytic box body is provided with an air blower, and the end part of an air supply pipeline connected with the air blower penetrates through the photocatalytic box body to be communicated with the hollow cavity in the photocatalytic partition plate.

The plurality of gas nozzles, the plurality of photocatalytic lamp edges and the photocatalytic partition plates are horizontally staggered and distributed up and down, and each horizontal line is provided with a gas nozzle or a photocatalytic lamp.

The catalytic filtration baffle both sides are equipped with many horizontal installation recesses respectively, are equipped with a plurality of photocatalysis lamps in each horizontal installation recess, the notch sealing connection of horizontal installation recess has printing opacity glass.

The air nozzle comprises a nozzle body arranged in the photocatalytic partition plate, an installation cavity is arranged in the nozzle body, one end of the installation cavity is communicated with a hollow cavity in the photocatalytic partition plate through a small-inside and large-outside horn mouth arranged on the nozzle body, closed bodies are symmetrically arranged in the installation cavity, the symmetrically arranged closed bodies are connected with the cavity wall of the installation cavity through springs, and the closed bodies are in smooth sealing contact with the cavity wall of the installation cavity;

a fluid channel is formed in the middle of the two symmetrical closing bodies, the fluid channel comprises a straight section communicated with the horn mouth, a necking section extending inwards from the straight section and a closing section communicated with the necking section, and when the sent air enters the fluid channel through the horn mouth, the closing section is opened after the necking section is accelerated, the closing section is opened, the whole fluid channel is opened, and the air enters the photocatalytic box body.

The filtering component is sequentially provided with a lower water permeable base layer, a cobble layer, a gravel layer, a filtering net layer, a bamboo charcoal layer and an upper water permeable base layer from bottom to top.

The utility model has the advantages that: 1. before the photocatalytic treatment, the whole sewage is subjected to impurity removal, precipitation and speed reduction through the filtering unit, so that the load of the photocatalytic treatment is reduced, the photocatalytic treatment device is protected, the sewage treatment effect is improved, and the cost of sewage treatment is reduced;

2. after the treatment is finished, the treated water can carry out back washing treatment on the filtering component, so that a higher filtering effect is ensured when the filtering component carries out filtering each time;

3. when the photocatalysis is carried out, the treated sewage is stirred by bubbles generated by sending high-pressure air, so that the efficiency of the photocatalysis is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of a filter unit according to the present invention;

FIG. 3 is a schematic diagram showing the results of the photocatalytic unit of the present invention

FIG. 4 is a schematic structural view of the photocatalytic separator of FIG. 3;

FIG. 5 is a schematic cross-sectional view of the photocatalytic separator of FIG. 3;

FIG. 6 is a schematic structural view of the showerhead of FIG. 4;

fig. 7 is a schematic view of the filter assembly of fig. 2.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Example 1

A sewage treatment system as shown in fig. 1, characterized by comprising a filtering unit 1, a photocatalytic unit 2 and a gas-liquid separator 3; the filtering unit 1 is used for precipitating, filtering and reducing the speed of introduced sewage, so that the sewage is prevented from directly entering the photocatalytic unit, the load of the photocatalytic unit is increased (including excessive impurities and excessive water flow), the photocatalytic unit is damaged, the photocatalytic unit is effectively protected through pre-treatment, the sewage is ensured to be treated more thoroughly, the gas-liquid separation unit is used for carrying out gas-liquid separation on the water after the photocatalytic action, the generated gas and liquid are separated, and the treated water is prevented from secondary pollution;

the specific connection relationship among the filtering unit, the photocatalytic unit and the gas-liquid separator is as follows: the upper end and the lower end of one side of the filtering unit 1 are respectively connected with a sewage feeding pipeline 4 and a back flushing liquid discharging pipeline 8, the filtering unit 1, the photocatalytic unit 2 and the gas-liquid separator 3 are sequentially communicated through a connecting pipeline 5, a liquid outlet of the gas-liquid separator 3 is connected with a liquid outlet pipeline 6, and the liquid outlet pipeline 6 is communicated with the connecting pipeline 5 between the filtering unit 1 and the photocatalytic unit 2 through a back cleaning pipeline 9;

the backwashing pipeline 9 is communicated with the liquid outlet pipeline 6 through a first three-way valve 11, and the backwashing pipeline 9 is communicated with a connecting pipeline 5 between the filtering unit 1 and the photocatalytic unit 2 through a second three-way valve 7; a backwashing pump 10 for pumping the liquid separated by the gas-liquid separator 3 into the filtering unit 1 is arranged on the backwashing pipeline 9;

the gas outlet of the gas-liquid separator 3 is communicated with a gas outlet pipeline 12.

When sewage treatment is carried out, the backwash liquid discharge pipeline 8 and the first three-way valve 11 open the liquid outlet pipeline 6, close the end of the backwash pipeline 9, open the connecting pipeline 5 by the second three-way valve 11 and close the end of the backwash pipeline 9; sewage to be treated enters a filtering unit through a sewage adding pipeline for precipitation, filtering and speed reduction pre-treatment, enters a photocatalytic unit for photocatalytic treatment, enters a gas-liquid separator for gas-liquid separation, gas after gas-liquid separation is discharged through a gas outlet pipeline 208, separated liquid is discharged through a gas outlet pipeline 12, and liquid is discharged through a liquid outlet pipeline 6;

when back flushing is needed, the first three-way valve 11 communicates the liquid outlet pipeline 6 with the end of the back flushing pipeline 9, the outlet end of the liquid outlet pipeline 6 is closed, the second three-way valve 11 communicates the back flushing pipeline 9 with the connecting pipeline 5 and the filtering unit, the filtering unit is closed with the photocatalytic unit, the back flushing liquid discharge pipeline 8 is opened, the back flushing pump 10 pumps liquid separated by the gas-liquid separator into the filtering unit through the back flushing pipeline 9, back flushing cleaning is conducted on the filtering unit, sewage after cleaning is discharged through the back flushing liquid discharge pipeline 8, back flushing cleaning is conducted, and impurities in the filtering unit can be thoroughly cleaned.

Example 2

On the basis of embodiment 1, the filtering unit shown in fig. 2 comprises a filtering box 101, a filtering partition plate 102 arranged in the filtering box 101, wherein the upper end of the filtering partition plate 102 is fixedly and hermetically connected with the top of the filtering box 101, and the lower end of the filtering partition plate has a gap with the bottom of the filtering box 101;

a sewage inlet 104 and a backwashing outlet 105 which are connected with the sewage feeding pipeline 4 and the backwashing liquid discharging pipeline 8 are arranged on the filtering box body 101 on one side of the filtering partition plate 102, and the sewage inlet 104 is positioned above the backwashing outlet 105;

the filtration and separation plate 102 separates the filtration box 101 into a sewage descending cavity and a sewage ascending cavity, specifically, sewage enters the left sewage descending cavity as shown in fig. 2 through the sewage inlet 104, and then gradually ascends along the right sewage ascending cavity after passing through a gap at the bottom (communicating device principle), the filtration component 103 is arranged between the other side of the filtration and separation plate 102 and the filtration box 101 (namely, in the sewage ascending cavity), the sewage is filtered during the ascending process, the processed impurities are prevented from being adhered to the filtration component, the blockage is easily caused, the filtration efficiency is improved, and the sewage speed is reduced, the circular arc groove 106 is arranged at the bottom of the filtration box 101, the lowest part of the circular arc groove 106 is positioned under the filtration and separation plate 102, and when the sewage passes through the bottom of the filtration and separation plate 102 to ascend, the sedimentation can be effectively performed, the precipitated sludge can enter the arc groove 106 for precipitation, so that the precipitation efficiency can be effectively improved;

a filtrate outlet 107 connected with the connecting pipeline 5 is arranged on the filtering box body 101 above the filtering component 103; the sewage after being filtered, precipitated and decelerated can be discharged from the filtrate outlet 107; when the backwashing is carried out, backwashing liquid enters the filter box body 101 from the filter outlet 107, firstly falls onto the filter assembly to clean the filter assembly, then falls into the arc groove 106 at the bottom of the filter box body 101 to stir and clean sludge, and sewage after cleaning is discharged through the backwashing outlet 105 at the bottom to complete backwashing.

The filter assembly 103 is specifically, as shown in fig. 7, sequentially from bottom to top, a lower water permeable base layer 1031, a pebble layer 1032, a crushed stone layer 1033, a filter mesh layer 1034, a bamboo charcoal layer 1035, and an upper water permeable base layer 1036.

Go up basic unit 1306 and the basic unit 1301 that permeates water down and regard as the basic unit, protect whole filtering component, infiltration filterable water at first carries out coarse filtration through cobblestone layer 1302, then enters into the rubble layer and carries out secondary coarse filtration, enters into the filtration stratum reticulare and carries out fine filtration, then adsorbs through the bamboo charcoal layer and filters, makes filterable effect more thorough, and the filter effect is higher, conveniently carries out the back flush simultaneously and washs.

Example 3

The photocatalytic unit 2 as shown in fig. 3 comprises a photocatalytic tank 201, a filtered water inlet 210 and a photocatalytic water outlet 211 disposed at both sides of the photocatalytic tank 201; the filtered water inlet 210 and the photocatalytic water outlet 211 are respectively communicated with the filtering unit 1 and the gas-liquid separator 3 through a connecting pipeline 5;

a photocatalytic baffle 202 and a catalytic filtering baffle 203 are arranged in the photocatalytic box body 201, the upper end of the photocatalytic baffle 202 is fixedly and hermetically connected with the top of the photocatalytic box body 201, and a gap is formed between the lower end of the photocatalytic baffle 202 and the bottom of the photocatalytic box body 201; the lower end of the catalytic filtering partition plate 203 is fixedly and hermetically connected with the bottom of the photocatalytic box body 201, and a gap is formed between the upper end of the catalytic filtering partition plate and the top of the photocatalytic box body 201;

the photocatalytic baffle plate 202 and the catalytic filtering baffle plate 203 divide the photocatalytic tank body 201 into a left cavity, a middle cavity and a right cavity, filtered sewage enters the left cavity through the filtered water inlet 210, then enters the middle cavity through the photocatalytic baffle plate 202, rises to submerge the top of the catalytic filtering baffle plate 203, enters the right cavity, and then is discharged through the photocatalytic water outlet 211;

the sewage enters the left cavity and the middle cavity to perform photocatalysis, specifically, a plurality of photocatalytic lamps 208 are arranged on two side surfaces of the photocatalytic clapboard 202, and photocatalytic surfaces 205 are arranged on the inner wall of the photocatalytic box body 201 and the end surfaces of the catalytic filtering clapboard 203 which are opposite to the photocatalytic clapboard 202;

the photocatalytic lamp and the photocatalytic surface are made of photocatalytic reaction materials known in the technical field, the photocatalytic reaction materials are not described in detail herein, and the process of carrying out secondary photocatalytic reaction is mainly described in detail, wherein sewage entering the left cavity is subjected to primary photocatalytic reaction through the catalytic lamp on the left side of the catalytic partition plate 202 and the photocatalytic surface 205 on the inner wall of the photocatalytic box body 201, and sewage entering the middle cavity through the bottom of the catalytic partition plate 202 is subjected to secondary photocatalytic reaction through the catalytic lamp on the right side of the catalytic partition plate 202 and the photocatalytic surface 205 on the catalytic filter partition plate 203;

accomplish the sewage of secondary photocatalysis and have fallen into right side chamber through catalytic filter baffle 203, through be equipped with filter screen 204 between the inner wall of catalytic filter baffle 203 and photocatalysis box 201 and filter, just photocatalysis water outlet 211 is located the below of filter screen 204.

In the process of performing the photocatalytic action, in order to ensure that the photocatalytic action can stir the sewage and accelerate the photocatalytic action, as shown in fig. 4 and fig. 5, a plurality of gas nozzles 209 are respectively arranged on two end surfaces of the photocatalytic baffle plate 202, and the gas nozzles 209 are communicated with a hollow cavity 213 arranged in the photocatalytic baffle plate 202; the top of the photocatalytic box 201 is provided with a blower 206, and the end of a gas supply line 207 connected with the blower 206 passes through the photocatalytic box 201 to communicate with a hollow cavity 213 in the photocatalytic baffle 202.

High-pressure air is sent into the hollow cavity 213 through the blower, and enters the sewage on two sides of the photocatalytic partition plate through the air nozzle 209, so that a large amount of bubbles are generated to drive the sewage to stir, the stirring purpose is realized, stirring blades are not used for stirring, the installation is convenient, the size is small, and the cost is low;

specifically, in order to enable more complete stirring and photocatalysis, the plurality of gas nozzles 209 and the plurality of photocatalytic lamps 208 are horizontally staggered from one another along the photocatalytic partition 202, and each horizontal line is provided with the gas nozzles 209 or the photocatalytic lamps 208.

The catalysis filters baffle 203 both sides and is equipped with many horizontal installation recess 214 respectively, is equipped with a plurality of photocatalysis lamps 208 in each horizontal installation recess 214, the notch sealing connection of horizontal installation recess 214 has printing opacity glass 212.

Inlay photocatalysis lamp 208 in parallel mounting groove 214, seal through printing opacity glass, protect photocatalysis lamp 208, photocatalysis lamp and photocatalysis board all be this technical field commonly used photocatalysis board and rather than complex photocatalysis lamp, do not carry out detailed description to it here, be equipped with same photocatalysis lamp or jet-propelled head on every horizontal line, guarantee its uniformity, can carry out abundant photocatalysis and stirring of carrying on simultaneously.

Example 4

On the basis of embodiment 3, in order to guarantee that the air nozzle carries high-pressure air at the air-blower, the air nozzle opens, and is out of work as the air-blower, and the air nozzle closes, avoids taking place sewage and carries out palirrhea condition.

As shown in fig. 6, the air cap 209 includes a spray head body 2091 disposed in the photocatalytic partition board 202, an installation cavity 2093 is disposed in the spray head body 2091, one end of the installation cavity 2093 is communicated with a hollow cavity 213 in the photocatalytic partition board 202 through a small inner bell mouth 2092 disposed on the spray head body 2091, a closing body 2094 is symmetrically disposed in the installation cavity 2093, the symmetrically disposed closing body 2094 is connected with a cavity wall of the installation cavity 2093 through a spring 2098, and the closing body 2094 is in smooth sealing contact with the cavity wall of the installation cavity 2093;

a fluid channel is formed in the middle of the two symmetrical closing bodies 2094, and the fluid channel comprises a straight section 2095 communicated with the bell mouth 2092, a necking section 2096 extending inwards from the straight section 2095 and a closing section 2097 communicated with the necking section 2096, and when the sent air enters the fluid channel through the bell mouth 2092 and is accelerated by the necking section 2096, the closing section 2097 is opened, the whole fluid channel is opened, and the air enters the photocatalytic box 201;

when the air blower is used, high-pressure air is fed into the hollow cavity through the air feeding pipeline, the high-pressure air enters the fluid channel through the horn mouth, the air pressure compresses the closing bodies towards two sides along with the increase of the air pressure entering the fluid channel, the symmetrical closing bodies move towards two sides, the closing section in the fluid channel opens the high-pressure air and enters sewage on two sides of the second partition plate through the fluid channel to form bubbles for stirring, when the closing section in the fluid channel is opened, the spring is compressed, when the air blower stops working, the air pressure in the fluid channel is reduced, the compressed spring needs to be reset, the symmetrical closing bodies are closed, the closing section is closed, the backflow of the sewage is avoided, meanwhile, the fluid channel is provided with a straight section and a necking section, the straight section is used for transition, and the necking section is used for increasing the air pressure, so that the closing section is convenient to open.

The above illustration is merely an illustration of the present invention, and does not limit the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.

Claims

1. A sewage treatment system is characterized by comprising a filtering unit (1), a photocatalytic unit (2) and a gas-liquid separator (3);

the sewage treatment device is characterized in that the upper end and the lower end of one side of the filtering unit (1) are respectively connected with a sewage adding pipeline (4) and a backwash liquid discharging pipeline (8), the filtering unit (1), the photocatalytic unit (2) and the gas-liquid separator (3) are sequentially communicated through a connecting pipeline (5), a liquid outlet of the gas-liquid separator (3) is connected with a liquid outlet pipeline (6), and the liquid outlet pipeline (6) is communicated with the connecting pipeline (5) between the filtering unit (1) and the photocatalytic unit (2) through a backwash pipeline (9);

the backwashing pipeline (9) is communicated with the liquid outlet pipeline (6) through a first three-way valve (11), and the backwashing pipeline (9) is communicated with a connecting pipeline (5) between the filtering unit (1) and the photocatalytic unit (2) through a second three-way valve (7); a back washing pump (10) for pumping the liquid separated from the gas-liquid separator (3) into the filtering unit (1) is arranged on the back washing pipeline (9);

and a gas outlet of the gas-liquid separator (3) is communicated with a gas outlet pipeline (12).

2. A sewage treatment system according to claim 1, wherein said filtering unit (1) comprises a filtering tank (101), a filtering partition plate (102) arranged in the filtering tank (101), the upper end of the filtering partition plate (102) is fixedly and hermetically connected with the top of the filtering tank (101), and the lower end has a gap with the bottom of the filtering tank (101);

a sewage inlet (104) and a backwashing outlet (105) which are connected with a sewage feeding pipeline (4) and a backwashing liquid discharging pipeline (8) are arranged on the filtering box body (101) on one side of the filtering partition plate (102), and the sewage inlet (104) is positioned above the backwashing outlet (105);

a filtering component (103) is arranged between the other side of the filtering partition plate (102) and the filtering box body (101), and a filtering liquid outlet (107) connected with the connecting pipeline (5) is arranged on the filtering box body (101) above the filtering component (103);

the bottom of the filtering box body (101) is in the shape of an arc groove (106), and the lowest position of the arc groove (106) is positioned right below the filtering partition plate (102).

3. The sewage treatment system according to claim 1, wherein said photocatalytic unit (2) comprises a photocatalytic tank (201), a filtered water inlet (210) and a photocatalytic water outlet (211) provided at both sides of the photocatalytic tank (201); the filtered water inlet (210) and the photocatalytic water outlet (211) are respectively communicated with the filtering unit (1) and the gas-liquid separator (3) through a connecting pipeline (5);

a photocatalytic clapboard (202) and a catalytic filtering clapboard (203) are arranged in the photocatalytic box body (201), the upper end of the photocatalytic clapboard (202) is fixedly and hermetically connected with the top of the photocatalytic box body (201), and a gap is formed between the lower end of the photocatalytic clapboard and the bottom of the photocatalytic box body (201); the lower end of the catalytic filtering clapboard (203) is fixedly and hermetically connected with the bottom of the photocatalytic box body (201), and a gap is formed between the upper end of the catalytic filtering clapboard and the top of the photocatalytic box body (201);

a plurality of photocatalytic lamps (208) are arranged on two side surfaces of the photocatalytic clapboard (202), and photocatalytic surfaces (205) are arranged on the inner wall of the photocatalytic box body (201) and the end surface of the catalytic filtering clapboard (203) which are opposite to the photocatalytic clapboard (202);

a filter screen (204) is arranged between the catalytic filtering clapboard (203) and the inner wall of the photocatalytic box body (201), and the photocatalytic water outlet (211) is positioned below the filter screen (204).

4. The sewage treatment system according to claim 3, wherein a plurality of gas nozzles (209) are respectively arranged on two end faces of the photocatalytic partition plate (202), and the gas nozzles (209) are communicated with a hollow cavity (213) arranged in the photocatalytic partition plate (202); the top of the photocatalytic box body (201) is provided with a blower (206), and the end part of a gas supply pipeline (207) connected with the blower (206) penetrates through the photocatalytic box body (201) to be communicated with a hollow cavity (213) in the photocatalytic partition plate (202).

5. The wastewater treatment system according to claim 4, wherein the plurality of gas nozzles (209) and the plurality of photocatalytic lamps (208) are horizontally staggered from one another along the photocatalytic partition (202) and each horizontal line is provided with a gas nozzle (209) or a photocatalytic lamp (208).

6. The sewage treatment system according to claim 3, wherein a plurality of horizontal mounting grooves (214) are respectively formed on two sides of the catalytic filtering partition plate (203), a plurality of photocatalytic lamps (208) are arranged in each horizontal mounting groove (214), and a transparent glass (212) is hermetically connected to a notch of each horizontal mounting groove (214).

7. The wastewater treatment system according to claim 4, wherein: the air nozzle (209) comprises a nozzle body (2091) arranged in the photocatalytic partition plate (202), an installation cavity (2093) is arranged in the nozzle body (2091), one end of the installation cavity (2093) is communicated with a hollow cavity (213) in the photocatalytic partition plate (202) through a horn mouth (2092) which is arranged on the nozzle body (2091) and is small in inside and large in outside, closed bodies (2094) are symmetrically arranged in the installation cavity (2093), the closed bodies (2094) which are symmetrically arranged are connected with the cavity wall of the installation cavity (2093) through springs (2098), and the closed bodies (2094) are in smooth sealing contact with the cavity wall of the installation cavity (2093);

a fluid channel is formed in the middle of the two symmetrical closing bodies (2094), the fluid channel comprises a straight section (2095) communicated with the bell mouth (2092), a necking section (2096) extending inwards from the straight section (2095), and a closing section (2097) communicated with the necking section (2096), when sent air enters the fluid channel through the bell mouth (2092), after the sent air is accelerated through the necking section (2096), the closing section (2097) is opened, the whole fluid channel is opened, and the air enters the photocatalysis box body (201).

8. The wastewater treatment system according to claim 2, wherein: the filter component (103) is sequentially provided with a lower water permeable base layer (1031), a cobblestone layer (1032), a crushed stone layer (1033), a filter screen layer (1034), a bamboo charcoal layer (1035) and an upper water permeable base layer (1036) from bottom to top.