CN2512773Y

CN2512773Y - Wastewater treatment equipment

Info

Publication number: CN2512773Y
Application number: CN02202319U
Authority: CN
Inventors: 金维瑾; 詹进达
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-01-11
Filing date: 2002-01-11
Publication date: 2002-09-25
Anticipated expiration: 2012-01-11

Abstract

The utility model relates to a wastewater treatment equipment for treating the domestic sewage, the name is wastewater treatment equipment. To solve the technical problem of treating the sewage by cesspool does not meet the sanitation discharge standard in large-scale sewage treatment works when treating the dispersed of sewage pollution source in the districts without sewage pipe network. The utility model includes a flocculate tank 1, a precipitate filtering tank 2 and an oxidize biochemistry tank 3. The flocculate tank 1 is communicated with the below part of the filtering tank 2, the upper part of the precipitate filtering tank 2 is communicated with the upper part of the biochemistry tank 3; the middle part of the filtering tank 2 has a screen plate 5, the surface of the screen plate 5 has a filter layer 6; the biochemistry tank 3 is provided with a lever clapboard 7, the lever clapboard 7 is provided with a plurality of water channels 8, the beginning and the end of each adjacent two water channels 8 are connected together, and the bottom of the water channels 8 has a filter layer. The utility model is essentially used for wastewater treatment, so the level of discharging standard of the treated wastewater can be reached.

Description

Sewage treatment equipment

The technical field is as follows:

the utility model relates to a device for purifying domestic sewage.

Background art:

the sewage treatment equipment which is disclosed to be used at present mainly comprises a large sewage treatment plant and a septic tank. The large-scale sewage treatment plant is mainly used in cities, and sewage discharged from the cities is concentrated into the large-scale sewage treatment plant for treatment, reaches the discharge standard and then is discharged into rivers, lakes or seas. The large-scale sewage treatment plant has large floor area and large investment, can only carry out centralized treatment on sewage, and can not solve the problem of sewage pollution generated by villages and towns, troops barracks, holiday villages in scenic tourism areas, hotels and the like which are dispersed in areas without sewage pipe networks. Therefore, the sewage which is dispersedly discharged into the source and the flow of the river can not be treated by the large-scale sewage treatment plant. In addition, the sewage treated by a large sewage treatment plant is generally discharged, and the reuse of reclaimed water cannot be realized. The septic tank is a sewage treatment facility which is used more than a hundred years ago, and compared with a large-scale sewage treatment plant, the septic tank has the advantages of small occupied area and small investment, and is suitable for treating dispersed sewage pollution sources in areas without sewage pipe networks. In order to solve the problem of sewage treatment in areas without sewage pipe networks, China still uses a large number of septic tanks to treat domestic sewage in organs, schools, troops barracks, resorts, hotels, factories and the like in areas without sewage pipe networks. The septic tank only can precipitate and ferment the coarse particles of the excrement, has no sewage purification function, and the sewage treated by the septic tank is still turbid and has foul smell, thus not meeting the sanitary discharge standard. If the sewage treated by the septic tank is directly discharged into rivers and lakes, the pollution to fresh water resources is still caused. In addition, a large amount of hydrogen sulfide gas is emitted from sewage treated and discharged by the septic tank, and the hydrogen sulfide can cause serious pollution to the atmosphere. Due to the poor sewage treatment effect of the septic tank, the septic tank is not used in the developed countries for a long time.

The invention content is as follows:

the to-be-solved technical problem of the utility model is that, large-scale sewage treatment plant can't handle the sewage pollution source of the dispersion in the area of no sewage pipe network, and the septic tank does not reach sanitary emission standard's requirement to the processing of sewage. For solving the technical problem, the utility model discloses a following technical scheme: the sewage treatment equipment comprises a flocculation tank 1, a precipitation filter tank 2 and an oxidation biochemical tank 3; it is characterized in that: the flocculation tank 1 is communicated with the lower part of the precipitation filter tank 2, and the upper part of the precipitation filter tank 2 is communicated with the upper part of the oxidation biochemical tank 3; the middle part of the precipitation filter tank 2 is provided with a filter plate 5, and a filter layer 6 is arranged on the filter plate 5; the oxidation biochemical tank 3 is internally provided with a horizontal partition plate 7, the horizontal partition plate 7 is provided with a plurality of water channels 8, an inlet 9 of the oxidation biochemical tank 3 is aligned with a first water channel 8, two adjacent water channels 8 are connected end to end, and the last water channel 8 is communicated with an outlet 10 of the oxidation biochemical tank 3; the bottom of the water channel 8 has a filter layer 11, the water channel 8 being in connection with the atmosphere.

The flocculation tank 1 has a sewage inlet through which sewage subjected to preliminary treatment or septic tank treatment enters the flocculation tank 1. The flocculation tank 1 has a chemical feed port through which chemicals for flocculating colloidal substances in the sewage, such as ferric chloride, can be fed into the flocculation tank 1. The flocculation tank 1 mainly has the functions of flocculating the colloidal substances which are half dissolved in water in the sewage by using a medicament, forcing the molecules to combine into particles to be separated out, precipitating to the bottom of the tank, then carrying out anoxic decomposition, and carrying out acid fermentation under the action of anaerobic bacteria to generate carbon dioxide and methane. If ferric trichloride is used as a flocculating agent, the ferric trichloride reacts with hydrogen sulfide to separate out sulfur and deposit the sulfur at the bottom of the tank, and toxic hydrogen sulfide gas is not discharged into the atmosphere. The main function of the sedimentation filter tank 2 is to filter and precipitate the flocculation particles in the sewage treated by the flocculation tank 1, the filter plate 5 is arranged in the middle part, the upward reverse filtration can be realized, the flocculation particles in the sewage are filtered by the filter plate 5 on the lower surface thereof, and the flocculation particles are precipitated to the tank bottom by the weight of the self to be continuously decomposed. A 'biological film' is formed in the gap of the filter layer 6, and the 'biological film' is used for further filtering and biochemical treatment of finer flocculation particles penetrating through the filter plate 5, so that organic matters are further biochemically degraded under the action of the 'biological film'. The oxidation biochemical tank 3 lengthens the flowing path of the sewage through the water channels 8 which are connected end to end, so that the contact area of the sewage and the air is increased in the flowing process. In the interstices of the filter layer 11, a "biofilm" is rapidly formed, which plays a biochemical role. The organic matter in the sewage reacts with oxygen in the atmosphere above the filter layer 11 to further oxidize the organic matter (wet combustion), and finally the sewage becomes clean, odorless and transparent.

The horizontal partition plates 7 in the oxidation biochemical tank 3 of the utility model are divided into a plurality of blocks which are distributed up and down in the oxidation biochemical tank 3 and are parallel to each other; the inlet 9 of the oxidation biochemical tank 3 is aligned with the first water channel 8 on the uppermost horizontal partition plate 7, and the last water channel 8 on the lowermost horizontal partition plate 7 is communicated with the outlet 10 of the oxidation biochemical tank 3; the beginning of the first water channel 8 of each middle horizontal partition 7 is aligned with the outlet 12 of the end of the last water channel 8 of the next previous horizontal partition 7, and the end of the last water channel 8 is aligned with the beginning of the first water channel 8 of the next adjacent horizontal partition 7.

The horizontal partition plates 7 are divided into a plurality of blocks, namely more than two blocks, so that the flow path of sewage can be increased on a limited floor area, and the sewage can freely fall between two adjacent horizontal partition plates 7, so that a large amount of oxygen in the air is dissolved in the sewage, and the effect of biochemical treatment on organic matters in the sewage is improved.

The water channel 8 on the horizontal clapboard 7 of the utility model is formed by a plurality of vertical clapboards 13 which are mutually separated, and the vertical clapboard 13 is fixed on the horizontal clapboard 7; the vertical partition plates 13 are parallel to each other and are vertical to the horizontal partition plate 7, so that the water channel 8 is in a straight groove shape; the water passage 8 communicates with the atmosphere through a vent pipe 14.

The utility model discloses a filter 15 has on the filter 5 of sedimentation filter jar 2, and filter layer 6 comprises the rubble.

The filter plate 5 has a plurality of holes through which sewage can pass, and a filter screen 15 is installed on the holes. When sewage passes through the filter screen 15 from bottom to top in the sedimentation filter tank 2, larger flocculation particles are filtered on the lower surface by the filter screen 15 and finally settle to the bottom of the tank by the weight of the sewage. The filter layer 6 is composed of gravels, and a 'biological film' is quickly formed in gaps of the gravels, so that smaller flocculated particles penetrating through the filter screen 15 are subjected to biochemical treatment under the action of the 'biological film'.

The filtering layer 11 at the bottom of the water channel 8 of the utility model is composed of gravels.

The filter layer 11 is made of crushed stone, and a 'biological film' is quickly formed in gaps of the crushed stone, so that organic matters in the sewage flowing through the water channel 8 are subjected to biochemical treatment under the action of the 'biological film'.

The utility model discloses a flocculation tank 1 has dosing tube 4 and gas tube 16.

The dosing pipe 4 is used for dosing a medicament for flocculating colloidalsubstances in the sewage into the flocculation tank 1, and the medicament can be ferric trichloride. The aeration pipe 16 is used for aerating high-pressure air into the sewage in the flocculation tank 1, and the high-pressure air is used for stirring the sewage, so that the added medicament is uniformly mixed with the sewage, and the flocculation effect is improved.

The above technical scheme of the utility model, the sewage that gets into flocculation tank 1 from the sewage entry of flocculation tank 1 generally is the sewage through preliminary treatment, for example the sewage through septic tank treatment.

Under the condition that the sewage is not subjected to primary treatment, the utility model can also comprise a septic tank 17 and a septic tank 18; the upper part of the septic tank 17 is provided with a sewage inlet 19, the upper part of the septic tank 17 is communicated with the upper part of the septic tank 18 through a communication pipe 20, and the upper part of the septic tank 18 is communicated with the upper part of the flocculation tank 1 through a communication pipe 21.

The sewage enters the septic tank 17 through the sewage inlet 19, is treated in the septic tank 17 and then enters the septic tank 18 through the communicating pipe 20. The organic matters in the sewage in the septic tank 17 and the septic tank 18 are fermented under the metabolism of the microorganisms to be aerobically degraded. The decomposition of organic matter is roughly divided into two stages: the first stage is an oxidation process and the second stage is a nitration process.

The oxidation process is mainly completed in the septic tank 17, that is, the process of oxidizing the organic matter into carbon dioxide, and the chemical equation is:

(microorganisms)

Under natural conditions (the temperature is 20 ℃), the oxidative decomposition of the organic matters in the first stage can be completed within 10-20 days.

The nitration process is mainly completed in the septic tank 18, under the action of nitrifying bacteria, ammonia (NH)₃) Oxidized to nitrite and nitrate, the chemical equation is:

the utility model has a vertically placed isolation board 22 in the septic tank 18, and the isolation board 22 vertically isolates the septic tank 18 into a chamber 23 and a chamber 24; the upper part of the chamber 23 is communicated with the upper part of the septic tank 17 through a communicating pipe 20, and the upper part of the chamber 24 is communicated with the upper part of the flocculation tank 1 through a communicating pipe 21; the chamber 23 and the chamber 24 are communicated with each other through a communication port at the lower portion of the partition plate 22, and a filter screen 25 is attached to the communication port.

The filter screen 25 can prevent larger organic particles and other impurities from being continuously decomposed in the septic tank 18.

In order to make the treated reclaimed water be continuously utilized, the utility model also comprises a water storage tank 26; the outlet 10 of the oxidation biochemical tank 3 is communicated with a water storage tank 26, and a water pumping pipe 27 is arranged in the water storage tank 26.

Compared with a large-scale sewage treatment plant, the utility model discloses area is little, and the cost is low, and the energy consumption is low. Because the utility modeldiscloses can realize the miniaturization, can extensively be used for tourist attraction, island, rural areas that do not have the sewage pipe network such as rural area, handle the domestic sewage that villages and small towns, army barracks, hotel, mill etc. produced. The utility model discloses, can prevent that domestic sewage from polluting source and flow in river, protection fresh water resource. Because the utility model discloses have retaining jar 26, can realize the reuse to the normal water, can practice thrift a large amount of fresh water. Compared with a septic tank, the utility model discloses it is very obvious to the treatment effect of sewage. Because the flocculating tank 1 can be added with agents such as ferric trichloride and the like, the colloid in the sewageThe substances are combined into particles to be separated out, and the particles are precipitated to the bottom of the tank for anoxic decomposition, and are subjected to acidic fermentation under the action of anaerobic bacteria to generate carbon dioxide, methane and hydrogen sulfide. The ferric trichloride reacts with the hydrogen sulfide to separate out sulfur which is deposited at the bottom of the tank. Therefore, secondary pollution caused by the fact that hydrogen sulfide generated in the sewage treatment process enters the atmosphere is avoided. Through the utility model discloses the domestic sewage who has handled, the Laoshan mountain area environmental monitoring station in Qingdao cityThe water quality monitoring report considers that: water outlet pollutant PH, COD_CRAnd suspended matters, ammonia nitrogen and phosphate all reach the primary standard of GB8978-1996 Integrated wastewater discharge Standard. The sewage treatment facility is used for treating COD_CRThe treatment effect of suspended matters is obvious, and the removal rate is more than 97.00 ″ [ from Laoshan annular Commission No. 45 in 2001]。

Description of the drawings:

fig. 1 is a front view (i.e., B-B view in fig. 2) of embodiment 1 of the present invention;

FIG. 2 is a view A-A of FIG. 1;

FIG. 3 is a view C-C of FIG. 2;

fig. 4 is a front view (full section) of embodiment 2 of the present invention;

FIG. 5 is a view D-D of FIG. 4;

fig. 6 is a view E-E of fig. 4.

The specific implementation mode is as follows:

the following describes in detail the preferred embodiments of the present invention with reference to the accompanying drawings.

Example 1:

as shown in fig. 1 to 3, the present embodiment is a square sewage treatment apparatus, which comprises a septic tank 17, a septic tank 18, a flocculation tank 1, a sedimentation filter tank 2, an oxidation biochemical tank 3, and a water storage tank 26. The flocculation tank 1, the sedimentation filter tank 2, the oxidation biochemical tank 3, the septic tank 17, the septic tank 18, and the water storage tank 26 are all made of concrete, are rectangular parallelepiped tanks, and are buried underground. The upper surfaces of the septic tank 17, the septic tank 18, the flocculation tank 1, the sedimentation and filtration tank 2, the oxidation biochemical tank 3 and the water storage tank 26 are respectively provided with

covers

28, 29, 30, 31, 32 and 33. The upper part of one side of the septic tank 17 is provided with a sewage inlet 19, the upper parts of two adjacent sides of the septic tank 17 and the septic tank 18 communicate the septic tank 17 with the septic tank 18 through a communication pipe 20, and the upper parts of twoadjacent sides of the septic tank 18 and the flocculation tank 1 communicate the septic tank 18 with the flocculation tank 1 through a communication pipe 21. The flocculation tank 1 is communicated with the sedimentation and filtration tank 2 through the communicating ports 34 at the lower parts of two adjacent sides of the flocculation tank 1 and the sedimentation and filtration tank 2, and the sedimentation and filtration tank 2 is communicated with the oxidation and biochemical tank 3 through the communicating pipes 9 at the upper parts of two adjacent sides of the oxidation and biochemical tank 3 and the sedimentation and filtration tank 2. The water outlet 10 of the oxidation biochemical tank 3 is communicated with the water storage tank 26. At one corner within the septic tank 18 is a longitudinally disposed divider 22, the divider 22 longitudinally dividing the septic tank 18 into a chamber 23 and a chamber 24. The upper part of the chamber 23 is communicated with the upper part of the septic tank 17 through a communicating pipe 20, and the upper part of the chamber 24 is communicated with the upper part of the flocculation tank 1 through a communicating pipe 21. The chamber 23 and the chamber 24 are communicated with each other through a communication port at the lower portion of the partition plate 22, and a filter screen 25 is attached to the communication port. The upper surface of the flocculation tank 1 is provided with a dosing tube 4 and an inflation tube 16, the outer end of the dosing tube 4 is communicated with a pump for adding a medicament, and the outer end of the inflation tube 16 is communicated with an air compressor. The middle part of the sedimentation filter tank 2 is provided with a filter plate 5, the filter plate 5 is provided with a plurality of holes through which sewage can pass, and the holes are provided with filter screens 15. The filtering layer 6 is arranged on the filtering plate 5, and the filtering layer 6 is composed of broken stones. Four horizontal partition plates 7 are arranged in the oxidation biochemical tank 3, and the four horizontal partition plates 7 are distributed up and down in the oxidation biochemical tank 3 and are mutually parallel. Each horizontal partition 7 is provided with a plurality of water channels 8, and the water channels 8 are formed by mutually spacing a plurality of vertical partitions 13. The vertical partition plates 13 are all fixed on the horizontal partition plate 7, and the vertical partition plates 13 on the same horizontal partition plate 7 are parallel to each other and are all vertical to the horizontal partition plate 7, so that the water channel 8 is in a straight groove shape. The upper surface of the oxidation biochemical tank 3 is provided with a vent pipe 14. The water passage 8 communicates with the atmosphere through a vent pipe 14. The bottom of the water channel 8 is provided with a filter layer 11, which filter layer 11 consists of crushed stone. The inlet 9 (i.e. the communicating pipe 9) of the oxidation biochemical tank 3 is aligned with the first water channel 8 on the uppermost horizontal partition plate 7, and the last water channel 8 on the lowermost horizontal partition plate 7 is communicated with the outlet 10 of the oxidation biochemical tank 3. The beginning of the first water channel 8 of each middle horizontal partition 7 is aligned with the outlet 12 of the end of the last water channel 8 of the next previous horizontal partition 7, and the end of the last water channel 8 is aligned with the beginning of the first water channel 8 of the next adjacent horizontal partition 7. A water pumping pipe 27 is arranged in the water storage tank 26, and the upper end of the water pumping pipe 27 is communicated with a water pump.

Example 2:

as shown in fig. 4 to 6, the present embodiment is a circular sewage treatment apparatus, which is composed of a septic tank 17, a septic tank 18, a flocculation tank 1, a sedimentation filter tank 2, and an oxidation biochemical tank 3. The flocculation tank 1, the sedimentation filter tank 2, the oxidation biochemical tank 3, the septic tank 17, the septic tank 18, and the water storage tank 26 are all made of concrete, are cylindrical tanks, and are buried underground. The sedimentation filter tank 2 is sleeved in the flocculation tank 1, and the space between the cylindrical side wall of the sedimentation filter tank 2 and the cylindrical side wall of the flocculation tank 1 forms the inner cavity of the flocculation tank 1. The septic tank 17, the septic tank 18, the sedimentation filter tank 2, and the oxidation biochemical tank 3 have covers 28, 29, 31, and 32 on their upper surfaces, respectively. The lower part of the sedimentation and filtration tank 2 is communicated with the flocculation tank 1, and a filter screen 36 is arranged at the communication position. The present embodiment is basically the same as embodiment 1 except that the digestion tank 17, the digestion tank 18, the flocculation tank 1, the precipitation filtration tank 2, and the oxidation biochemical tank 3 are all cylindrical tanks, the digestion tank 18 does not have a partition plate 22, the precipitation filtration tank 2 is fitted in the flocculation tank 1, and the water storage tank 26 is not provided, and the like.

In use in the above examples 1 and 2, domestic sewage enters the septic tank 17 through the sewage inlet 19. In the septic tank 17, the organic matter in the sewage is fermented under the metabolic action of the microorganisms for aerobic degradation, which is an oxidation process. The sewage decomposed by the peroxide in the septic tank 17 is introduced into the septic tank 18 through the communicating pipe 20. In the septic tank 18, the sewage is treated with ammonia (NH) by nitrifying bacteria₃) Is oxidized into nitrite and nitrate substances, and the process is a nitrification stage. The sewage treated by the septic tank enters the flocculation tank 1 through thecommunicating pipe 21. 5 percent ferric trichloride concentrated solution is pumped into the flocculation tank 1 through the dosing pipe 4, and simultaneously high-pressure air is filled into the flocculation tank 1 through the inflation pipe 16 to stir the sewage, so that colloidal substances which are semi-soluble in water in the sewage are flocculated, the molecules of the colloidal substances are forced to combine into particles and are separated out, the particles are precipitated to the bottom of the tank, anoxic decomposition is carried out, and acid fermentation is carried out under the action of anaerobic bacteria to generate carbon dioxide and methane. Ferric trichloride and hydrogenation by sulfurationThe sulfur can be precipitated and deposited at the bottom of the tank, and the toxic hydrogen sulfide can disappear. The filter screen 25 and the filter screen 36 can block larger organic particles and other impurities. The sewage flocculated by the flocculation tank 1 enters the sedimentation and filtration tank 2 through the communication port 34. In the sedimentation filter tank 2, the sewage is filtered by the filter screen 15 and the filter layer 6, and the flocculated particles filtered on the lower surface of the filter screen 15 are sedimentated to the bottom of the tank under the action of the self weight and continue to be decomposed. A 'biological film' is quickly formed in the gap between the filter screen 15 and the filter layer 6, and the 'biological film' can play a role in both filtering and biochemical functions. The suspended matters in the sewage treated by the precipitation filter tank 2 are greatly reduced, and the turbidity is reduced. The sewage treated by the precipitation filter tank enters the oxidation biochemical tank 3 through the communicating pipe 9. In the oxidation biochemical tank 3, a biological membrane is quickly generated in the gap of the filter layer 11, the biological membrane is used for carrying out biochemical treatment and filtration on residual organic matters in the sewage, and the residual organic matters are biodegraded in the large-area biochemical layer. Meanwhile, because the air pipe 14 leads air into the water channel 8, sufficient oxygen leads the organic matters in the sewage to be further oxidized (wet combustion), and the water discharged into the water storage tank 26 through the outlet 10 is clean and tasteless, thereby reaching the first-level discharge standard. The water pump is started to pump the reclaimed water in the water storage tank 26 through the water pumping pipe 27 for reuse.

Claims

1. The sewage treatment equipment comprises a flocculation tank (1), a precipitation filtering tank (2) and an oxidation biochemical tank (3); the method is characterized in that: the flocculation tank (1) is communicated with the lower part of the precipitation filter tank (2), and the upper part of the precipitation filter tank (2) is communicated with the upper part of the oxidation biochemical tank (3); the middle part of the precipitation filtering tank (2) is provided with a filtering plate (5), and a filtering layer (6) is arranged on the filtering plate (5); the oxidation biochemical tank (3) is internally provided with a horizontal partition plate (7), the horizontal partition plate (7) is provided with a plurality of water channels (8), an inlet (9) of the oxidation biochemical tank (3) is aligned to a first water channel (8), two adjacent water channels (8) are connected end to end, and the last water channel (8) is communicated with an outlet (10) of the oxidation biochemical tank (3); the bottom of the water channel (8) is provided with a filter layer (11), and the water channel (8) is communicated with the atmosphere.

2. The sewage treatment apparatus according to claim 1, wherein: the horizontal partition plates (7) in the oxidation biochemical tank (3) are divided into a plurality of blocks which are distributed up and down in the oxidation biochemical tank (3) and are parallel to each other; an inlet (9) of the oxidation biochemical tank (3) is aligned with a first water channel (8) on the uppermost horizontal partition plate (7), and a last water channel (8) on the lowermost horizontal partition plate (7) is communicated with an outlet (10) of the oxidation biochemical tank (3); the initial end of the first water channel (8) on each horizontal partition plate (7) in the middle is aligned with the outlet (12) at the tail end of the last water channel (8) on the adjacent upper horizontal partition plate (7), and the tail end of the last water channel (8) is aligned with the initial end of the first water channel (8) on the adjacent lower horizontal partition plate (7).

3. The sewage treatment apparatus according to claim 2, wherein: the water channel (8) on the horizontal clapboard (7) is formed by a plurality of vertical clapboards (13) which are mutually spaced, and the vertical clapboards (13) are fixed on the horizontal clapboard (7); the vertical partition plates (13) are parallel to each other and are vertical to the horizontal partition plate (7), so that the water channel (8) is in a straight groove shape; the water passage (8) is communicated with the atmosphere through a vent pipe (14).

4. The sewage treatment apparatus according to claim 3, wherein: a filter screen (15) is arranged on a filter plate (5) of the sedimentation filter tank (2), and a filter layer (6) is composed of broken stones.

5. The sewage treatment apparatus according to claim 4, wherein: the filtering layer (11) at the bottom of the water channel (8) is composed of gravels.

6. The sewage treatment apparatus according to claim 5, wherein: the flocculation tank (1) is provided with a dosing pipe (4) and an inflation pipe (16).

7. The sewage treatment apparatus according to claim 1, 2, 3, 4, 5 or 6, wherein: also comprises a septic tank (17) and a septic tank (18); the upper part of the septic tank (17) is provided with a sewage inlet (19), the upper part of the septic tank (17) is communicated with the upper part of the septic tank (18) through a communicating pipe (20), and the upper part of the septic tank (18) is communicated with the upper part of the flocculation tank (1) through a communicating pipe (21).

8. The sewage treatment apparatus of claim 7, wherein: the inside of the septic tank (18) is provided with a longitudinally-arranged partition plate (22), and the partition plate (22) longitudinally partitions the septic tank (18) into a chamber (23) and a chamber (24); the upper part of the chamber (23) is communicated with the upper part of the septic tank (17) through a communicating pipe (20), and the upper part of the chamber (24) is communicated with the upper part of the flocculation tank (1) through a communicating pipe (21); the lower part of the partition plate (22) communicates the chamber (23) with the chamber (24) through a communication port, and a filter screen (25) is arranged at the communication port.

9. The sewage treatment apparatus of claim 7, wherein: also comprises a water storage tank (26); an outlet (10) of the oxidation biochemical tank (3) is communicated with a water storage tank (26), and a water pumping pipe (27) is arranged in the water storage tank (26).