CN117263395A

CN117263395A - Biological expanding and cultivating integrated equipment and wastewater treatment process

Info

Publication number: CN117263395A
Application number: CN202311259829.9A
Authority: CN
Inventors: 刘毅勐; 高延明; 陈新芳; 郑力飞; 刘信源; 邹敏
Original assignee: Fujian Hengjia Environmental Protection Equipment Co ltd
Current assignee: Fujian Hengjia Environmental Protection Equipment Co ltd
Priority date: 2023-09-27
Filing date: 2023-09-27
Publication date: 2023-12-22

Abstract

The application discloses biological expanding culture integrated equipment and a wastewater treatment process, which relate to the technical field of wastewater treatment and comprise an expanding culture tank, a homogenizing tank and a biological expanding culture tank, wherein an inner cavity is formed in the expanding culture tank, a first containing cavity is formed in the homogenizing tank, a second containing cavity is formed in the biological expanding culture tank, and the homogenizing tank is connected and communicated with the biological expanding culture tank; the expanding culture tank is communicated with the biological expanding culture pond; the culture expansion tank is provided with a first stirrer, a gas distribution device and a heating piece; a second stirrer is arranged on the homogenizing pool; the biological expanding culture pond is provided with an aeration device, a third stirrer and a plurality of suspended fillers, wherein the aeration device comprises a main air pipe and a plurality of bronchi, the bronchi are communicated with the main air pipe, and the bronchi are communicated with the second accommodating cavity. The application can continuously provide needed biological flora for wastewater treatment, and improve the effect of biological ammonia nitrogen removal, thereby improving the effect of wastewater treatment.

Description

Biological expanding and cultivating integrated equipment and wastewater treatment process

Technical Field

The application relates to the technical field of wastewater treatment, in particular to biological expanding culture integrated equipment and a wastewater treatment process.

Background

The wastewater treatment is to treat the wastewater by using physical, chemical and biological methods, so that the wastewater is purified, pollution is reduced, the wastewater is recovered and reused, and water resources are fully utilized.

The existing high ammonia nitrogen high concentration wastewater is discharged into the water body along with domestic sewage (such as landfill leachate, kitchen Yu Zhao liquid and the like), so that the water body is eutrophicated, the water body eutrophication not only can reduce dissolved oxygen in the water and destroy the original natural ecological environment of the water body, but also can influence the water safety and sanitation of a water source area and lose the original functions of the water body.

The treatment of high concentration ammonia nitrogen wastewater has been a difficult point. The physicochemical treatment method has high investment and operation cost, and is easy to cause secondary pollution, so that the application range of the physicochemical treatment method is greatly limited; the method for biologically removing ammonia nitrogen is widely applied to the treatment process of the nitrogen-containing wastewater by virtue of the advantages of simple process, low operation and maintenance cost, no secondary pollution and the like.

However, the conventional biological ammonia nitrogen removal process (such as two-stage a/O) still has the following problems: 1. the biological flora has low proliferation speed, so that the high concentration of the biological flora is difficult to maintain; 2. the biological flora has insufficient capability of treating high ammonia nitrogen wastewater, and the activity of the biological flora is easy to be inhibited. Therefore, the wastewater treatment process based on the traditional biological ammonia nitrogen removal process has the problems of longer total hydraulic retention time, lower load, unstable wastewater treatment operation and unstable wastewater treatment effect.

Disclosure of Invention

The application provides a biological expansion and cultivation integrated equipment and a wastewater treatment process, which can continuously provide required biological flora for wastewater treatment, improve the effect of biological ammonia nitrogen removal, and further improve the effect of wastewater treatment.

On the one hand, the application provides biological expanding and cultivating integrated equipment, which adopts the following technical scheme:

the biological expansion and culture integrated equipment comprises an expansion and culture tank, a homogenizing tank and a biological expansion and culture tank, wherein an inner cavity for preliminary propagation of biological flora is formed in the expansion and culture tank, a first containing cavity for mixing various substances is formed in the homogenizing tank, a second containing cavity for mass propagation of the biological flora is formed in the biological expansion and culture tank, the homogenizing tank is connected with the biological expansion and culture tank, and the first containing cavity is communicated with the second containing cavity; the expansion culture tank is connected with the biological expansion culture pond, and the inner cavity is communicated with the second containing cavity;

the culture expansion tank is provided with a first stirrer, a gas distribution device and a heating piece, wherein the first stirrer is used for stirring substances in the inner cavity, and the gas distribution device and the heating piece are both arranged in the inner cavity;

the homogenizing pool is provided with a second stirrer which is used for stirring substances in the first accommodating cavity;

The biological expanding culture pond is provided with an aeration device, a third stirrer and a plurality of suspended fillers, the aeration device comprises a main air pipe and a plurality of bronchi, the main air pipe is positioned above the second containing cavity, one end of the bronchi is detachably connected and communicated with the main air pipe, and the other end of the bronchi is positioned in the second containing cavity and communicated with the second containing cavity; the third stirrer is used for stirring the substances in the second containing cavity; the suspended filler is positioned in the second containing cavity and suspended in the second containing cavity.

By adopting the technical scheme, after microorganisms and nutrient substances are added into the inner cavity of the expansion culture tank, the microorganisms and the nutrient substances are uniformly stirred by the first stirrer, and meanwhile, the gas distribution device and the heating element provide proper conditions for the propagation of the microorganisms, so that the microorganisms can be rapidly and stably propagated in the inner cavity to realize preliminary propagation; the homogenizing pool is provided with substances such as sludge and the like which are generated and flow back from the subsequent steps, part of biological flora is returned to the first containing cavity along with the substances such as sludge and the like, nutrition substances are additionally added, the waste water enters the first containing cavity after pretreatment, and the second stirrer is used for stirring and mixing a plurality of substances to wait for entering the biological expanding culture pool, so that the biological flora can still keep higher activity after returning to the homogenizing pool; the preliminarily propagated microorganisms are added into a second cavity of the biological expansion pond, substances in the first cavity also enter the first cavity, the two different substances with different sources are uniformly stirred by a third stirrer, meanwhile, sufficient oxygen is provided for biological flora propagation by an aeration device, and a plurality of suspended fillers provide proper places for biological flora propagation, so that the biological flora can be rapidly and stably propagated in the second cavity; finally, the biological expanding and cultivating integrated equipment can continuously provide high-activity biological flora for removing ammonia nitrogen for subsequent organisms, and the ammonia nitrogen removal effect of the organisms is improved, so that the final wastewater treatment effect is improved; and the waste generated in the wastewater treatment process can be fully utilized, the resources can be recycled, and the cost is reduced.

Optionally, the device further comprises a metering pump, wherein two ends of the metering pump are respectively connected with the expanding culture tank and the biological expanding culture tank, and two ends of the metering pump are respectively communicated with the inner cavity and the second containing cavity.

By adopting the technical scheme, the metering pump can control the quantity of the biological flora entering the biological expansion pond from the expansion tank according to the related condition of the biological flora in the second accommodating cavity, so that the concentration of the biological flora in the second accommodating cavity is kept at a certain level, mass propagation of the biological flora in the second accommodating cavity is facilitated, and the probability that the propagation speed is slower and activity is reduced due to lower concentration of the biological flora is reduced due to higher concentration of the biological flora can be reduced.

Optionally, the air distribution device comprises a first air pipe and a plurality of second air pipes, the first air pipe is located above the inner cavity, one end of each second air pipe is connected and communicated with the first air pipe, the other end of each second air pipe is close to the bottom of the inner cavity, and one end, far away from the first air pipe, of each second air pipe is provided with a plurality of air holes communicated with the inner cavity; the first stirrer is arranged in the middle relative to the inner cavity, and the plurality of second air pipes are arranged around the first stirrer.

By adopting the technical scheme, the stirring effect of the first stirrer on various substances in the inner cavity can be improved, so that the mixing effect of the various substances in the inner cavity is improved, and the stirring dead angle in the inner cavity is reduced; the second air pipes surround the first stirrer to distribute air in the inner cavity, so that the air distribution effect of the air distribution device in the inner cavity is more uniform.

Optionally, the first air tube is ring-mounted, and the first air tube surrounds the first stirrer; the first air pipe is rotationally connected with the expansion tank, the rotation axis of the first air pipe coincides with the axis of the first stirrer, and the first air pipe synchronously rotates reversely along with the stirring of the first stirrer.

By adopting the technical scheme, in the process of stirring the substances in the inner cavity by the first stirrer, the first air pipe rotates along with the stirring to drive the plurality of second air pipes to move, and the plurality of second air pipes can stir the substances in the inner cavity, so that the mixing effect of a plurality of substances in the inner cavity is further improved, the contact of biological flora with the substances required by the propagation of the biological flora is facilitated, and the preliminary propagation of the biological flora is facilitated; simultaneously, a plurality of second trachea activities can make the gas distribution effect of gas distribution device in the inner chamber more even to can further help biological flora to initially reproduce in the inner chamber.

Optionally, one end of the second air pipe far away from the first air pipe is provided with a stirring piece, the stirring piece comprises a plurality of bristles with elastic deformation capacity, and the bristles are propped against the cavity wall at the bottom of the inner cavity and are extruded, bent and deformed.

Through adopting above-mentioned technical scheme, the in-process of second trachea activity turns over and stirs the piece and can turn over the stirring to deposit the material in the inner chamber bottom to further improve the effect that multiple material mixes in the inner chamber, reduce the material subsidence such as biological fungus crowd, improve the utilization ratio of biological fungus crowd to its preliminary required material of breeding simultaneously.

Optionally, the expansion culture tank is provided with a plurality of protrusions on a cavity wall at the bottom of the inner cavity, the protrusions are distributed along the moving track of the stirring piece, and the protrusions are in contact with the bristles in the moving process of the stirring piece.

By adopting the technical scheme, the stirring piece is driven to sequentially contact with the bulges in the process of moving the second air pipe, and the bulges further bend and deform the bristles when the bristles contact with the bulges; when the bristles are separated from the bulges, the bristles recover to deform to a certain extent, and in the process, the bristles can further stir the matters sinking in the inner cavity, so that the stirring effect of the stirring piece is improved.

Optionally, the second air pipe is perpendicular to the first air pipe, the second air pipe is rotationally connected with the first air pipe, and the rotation axis of the second air pipe coincides with the axis of the second air pipe; after the stirring piece is contacted with the bulge, the acting force of the bulge on the stirring piece drives the second air pipe to rotate.

Through adopting above-mentioned technical scheme, the second trachea activity drives turns over the stirring piece in proper order with the in-process of a plurality of protruding contacts, and the second trachea will order about self for first trachea rotation under bellied effort, and supplementary gas will get into through a plurality of gas pockets in the inner chamber for the gas distribution effect is more even, thereby further helps biological flora and supplementary gaseous contact, and then makes the environment in the inner chamber more suitable for biological flora preliminary propagation.

On the other hand, the application also provides a wastewater treatment process, which adopts the following technical scheme:

the wastewater treatment process is based on the biological expanding culture integrated equipment, and comprises the following specific steps:

s1, wastewater pretreatment, which reduces impurities in wastewater;

s2, the wastewater enters the biological expansion and culture integrated equipment and is mixed with biological flora;

s21, adding microorganisms and nutrient substances into the expansion culture tank to initially reproduce the microorganisms in the inner cavity;

S22, the wastewater enters the homogenizing pool, and nutrient substances are added into the homogenizing pool;

s23, mixing the wastewater in the homogenizing tank with other substances, and then entering the biological expanding culture tank, wherein the microorganisms which are primarily propagated in the expanding culture tank enter the biological expanding culture tank for mass propagation;

s3, a two-stage A/O treatment system reduces COD and total nitrogen concentration in the wastewater;

s4, filtering and separating by an ultrafiltration system to realize solid-liquid separation, and refluxing part of sludge into the homogenizing pool;

s5, respectively treating the separated solid and liquid;

s51, deeply treating the membrane to enable the effluent to reach the standard;

s52, dehydrating and discharging the sludge.

By adopting the technical scheme, in the original process for removing ammonia nitrogen by organisms, the step of biological expansion culture is added, so that the biological flora for removing ammonia nitrogen can be continuously supplemented to the two-stage A/O treatment process, meanwhile, the biological flora with higher activity can be repeatedly utilized, the effect of removing ammonia nitrogen by organisms is improved, the two-stage A/O treatment can keep higher wastewater treatment effect, and the high-concentration ammonia nitrogen wastewater also has enough treatment capacity, so that the effect of wastewater treatment is improved.

Optionally, part of the nitrified liquid generated by the two-stage A/O treatment in the step S3 is returned to the homogenizing pool.

Through adopting above-mentioned technical scheme, in the part nitrified liquid backward flow was to first appearance chamber, can make the waste water after the preliminary treatment mix with it before getting into the second appearance chamber, can enough make the biological flora that gets back to first appearance chamber along with mud keep the activity, make the sewage after the preliminary treatment can realize initially reducing ammonia nitrogen in first appearance chamber, also make things convenient for follow-up waste water to reduce ammonia nitrogen under the effect of biological flora simultaneously.

Optionally, in S2, the liquid after the raw water overrun and the wastewater enter the biological expansion and culture integrated device together, so that the substances in the homogenizing pool are more suitable for biological flora propagation.

By adopting the technical scheme, substances in the homogenizing pool can be regulated, so that the conditions of the substances in the first containing cavity are more suitable for biological flora propagation, and the biological flora can be propagated in a large amount in the second containing cavity after the substances in the first containing cavity enter the second containing cavity.

In summary, the present application includes at least one of the following beneficial effects:

1. the biological expansion culture tank can be used for carrying out expansion culture on beneficial microorganism strains, and inoculating the beneficial microorganism strains into the biological expansion culture tank for carrying out one-step expansion culture;

2. the biological film on the surface of the suspended filler in the biological expanding culture pond has a certain thickness, and the gradient distribution of nutrient substances and dissolved oxygen concentration exists, so that the suspended filler can store good microbial strains including inoculated bacillus groups, yeast groups, lactic acid bacteria groups and nitrifying bacteria/denitrifying bacteria or ammoxidation bacteria/nitrite bacteria oxidizing bacteria domesticated and cultured by a biochemical system;

3. Under the condition that microorganisms are not added into the biological expansion tank, the biological film on the suspended filler in the biological expansion tank can also provide good microorganism strains for the rear-end two-stage A/O system;

4. the homogenizing pool is provided with a second stirrer, so that the added nutrient substances, the pretreated effluent, the reflux sludge and the nitrifying liquid can be completely mixed;

5. the biological flora and substances required by propagation thereof can be distributed more uniformly in the expanding culture tank, which is helpful for the biological flora to be fully contacted with the substances required by self propagation, further helps the preliminary propagation of the biological flora and improves the activity of the biological flora obtained by the preliminary propagation.

Drawings

FIG. 1 is a schematic structural view of a biological growth integrated apparatus according to example 1;

FIG. 2 is a schematic view showing a partial structure of the bottom of the aeration device in example 1;

FIG. 3 is a schematic view of the internal structure of the culture pot in example 2 (the expression of the heating element is omitted);

FIG. 4 is a partial cross-sectional view of the stirring member in contact with the projection in example 2;

FIG. 5 is a flow chart of a wastewater treatment process in example 3.

Reference numerals illustrate: 1. expanding a culture tank; 11. an inner cavity; 111. a protrusion; 12. a first agitator; 13. a gas distribution device; 131. a first air tube; 132. a second air pipe; 1321. air holes; 14. a heating member; 15. turning over the stirring piece; 151. brushing; 2. a homogenizing pool; 21. a first cavity; 22. a second stirrer; 3. a biological expanding culture pond; 31. a second cavity; 32. a third agitator; 33. an aeration device; 331. a main air pipe; 332. bronchi; 333. a swirl pot; 3331. a swirl passage; 334. a filter screen; 335. a conical impeller; 336. a positioning seat; 34. suspending filler; 4. a communication port; 5. a filter screen; 6. cleaning the nozzle; 7. a metering pump; 8. a blower.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-5.

Example 1:

referring to fig. 1, an embodiment of the present application discloses a biological expansion and culture integrated apparatus for mass propagation of biological flora for wastewater treatment (mainly functioning to remove pollutants such as COD, ammonia nitrogen, and total nitrogen contained in wastewater), including an expansion and culture tank 1, a homogenizing tank 2, and a biological expansion and culture tank 3. The culture expansion tank 1 is used for primarily breeding the needed biological flora, the homogenizing tank 2 is used for mixing waste water, reflux substances (nitrifying liquid, sludge containing the needed biological flora and the like) and the like, and the culture expansion tank is used for mass breeding of the biological flora. In the wastewater treatment process, biological flora required by preliminary propagation is maintained in the propagation tank 1 and is added into the biological propagation tank 3, meanwhile, substances mixed in the homogenizing tank 2 enter the biological propagation tank 3 to provide an environment for mass propagation of the biological flora, and the biological flora enters the subsequent wastewater treatment step after mass propagation in the biological propagation tank 3.

The biological flora is one or more of bacillus, yeast and lactobacillus, and in this embodiment, the biological flora is preferably a mixed flora composed of bacillus, yeast and lactobacillus.

In this embodiment, it is preferable that the homogenization tank 2 and the biological growth tank 3 are both square steel-structured water tank structures. In other embodiments, the homogenizing tank 2 and the biological growth expanding tank 3 may also be of a civil engineering structure and may also be in the shape of a tank.

In this embodiment, it is preferable that the homogenization tank 2 and the biological growth tank 3 are of an integrated structure, and that the growth tank 1 is independently installed with respect to both. In other embodiments, the expansion tank 1 may also be fixedly mounted directly on the homogenizing tank 2 or the biological expansion tank 3.

The inside of the homogenizing pool 2 is provided with a first containing cavity 21 for mixing substances, the inside of the biological expanding and culturing pool 3 is provided with a second containing cavity 31 for mass propagation of biological flora, a communication port 4 for material circulation is arranged between the homogenizing pool 2 and the biological expanding and culturing pool 3 at a position close to the top, and a communication port 4 for material circulation is also arranged at a position close to the top, far from one end of the biological expanding and culturing pool 3, of the homogenizing pool 2. The substances in the first chamber 21 can enter the second chamber 31 through the communication port 4, and the substances in the second chamber 31 can also enter the subsequent wastewater treatment equipment through the communication port 4.

Further, it is preferable that the filter screen 5 for filtering large particulate matters such as sludge is fixedly installed at the positions of the communication ports 4, and two filter screens 5 are fixedly installed at the positions of each communication port 4 to form a double-layer filter screen 5. Correspondingly, the homogenizing tank 2 and the biological expanding tank 3 are fixedly provided with cleaning nozzles 6 for cleaning the filter screen 5, the cleaning nozzles 6 are correspondingly positioned in the first accommodating cavity 21 or the second accommodating cavity 31, one ends of the cleaning nozzles 6 incline downwards towards the corresponding filter screen 5, and the other ends of the cleaning nozzles 6 are externally connected with pipelines for inflow of pressure water, and the filter screen 5 is cleaned through high-pressure water flow spraying. In this embodiment, since the cleaning nozzle 6 is a common prior art, the description thereof is omitted herein.

In other embodiments, a partition wall can be arranged in the biological expansion pond 3 according to the actual pond type, so that short flow of water inlet and water outlet is avoided, namely, sewage is prevented from directly leaving the second containing cavity 31 through the communication port 4 after entering the second containing cavity 31 from the first containing cavity 21.

The homogenizing tank 2 is externally connected with a plurality of pipelines, and is respectively used for delivering pretreated wastewater, liquid exceeding raw water, nutrient substances required by biological flora propagation, reflux substances and the like into the first accommodating cavity 21. The nutrient substances are mainly carbon sources, and are one or more of glucose, brown sugar, molasses, fruit and vegetable fermentation liquid and methanol; in this example, the carbon source in the nutrient is preferably a mixed liquid of 2% glucose and 10% sewage (after pretreatment).

The homogenizing tank 2 is further provided with a second stirrer 22 for mixing the above substances, in this embodiment, the second stirrer 22 is preferably a combination of a motor and a stirring impeller, and the stirring impeller extends into the first accommodating cavity 21 at a position close to the bottom; since the above-mentioned stirrer is a common prior art, a detailed description thereof is omitted herein and only a brief description thereof is shown in the drawings. In this embodiment, the second stirrer 22 is preferably a submersible stirrer.

In this embodiment, it is preferable that the residence time of the plurality of substances in the homogenizing tank 2 is 1-2 hours, and the second stirrer 22 stirs and mixes the plurality of substances in the first accommodating chamber 21 uniformly; after supplementing the first cavity 21 with the nutrient substances, the substances in the first cavity 21 can be regulated so that the ratio of C to N to P is controlled between 20:5:1 and 25:5:1.

The interior of the expanding culture tank 1 is provided with an inner cavity 11 for the preliminary propagation of biological flora, and the expanding culture tank 1 is also externally connected with a plurality of pipelines for respectively feeding the biological flora, nutrient substances, pretreated wastewater and the like into the inner cavity 11.

Wherein the nutrient substances comprise carbon sources and other nutrient substances, wherein the carbon sources are one or more of glucose, brown sugar, molasses, fruit and vegetable fermentation liquid and methanol, and the other nutrient substances comprise 2-3% of soybean meal liquid, 1-1.5% of corn steep liquor, 0.05-0.55% of ammonium sulfate, 0.05-0.1% of magnesium sulfate, 0.1-0.25% of disodium hydrogen phosphate, 0.3-0.5% of wall breaking yeast, 0.01-0.03% of protease and the like. In this embodiment, the carbon source in the nutrient substances is preferably a mixed liquid of 2% glucose and 10% sewage (after pretreatment), and the other nutrient substances preferably include 3% soybean meal, 1% corn steep liquor, 0.05% ammonium sulfate, 0.1% magnesium sulfate, 0.2% disodium hydrogen phosphate, 0.5% wall-broken yeast, and 0.03% protease.

In this embodiment, the form of the biological flora to be added to the cavity 11 may be either liquid or dry powder, and the form is not limited thereto, and the composition of the biological flora to be added at this time is preferably the same as that of the biological flora to be added to the first cavity 21.

In this example, it is preferable that the substances in the lumen 11 should be such that the COD of the solution is 15000mg/l to 30000mg/l after the addition of the nutrient.

The first stirrer 12 for fully mixing the substances is also mounted on the culture expansion tank 1, in this embodiment, the first stirrer 12 is preferably composed of a motor and a stirring impeller, the motor is fixedly mounted on the outer side of the culture expansion tank 1, the stirring impeller is located in the inner cavity 11, and the motor drives the stirring impeller to rotate to stir the substances in the inner cavity 11.

The expanding culture tank 1 is also provided with a gas distribution device 13 and a heating element 14, wherein the gas distribution device 13 is used for providing oxygen for the propagation of biological flora, and the heating element 14 is used for providing a proper temperature environment for the propagation of biological flora. The gas distribution device 13 is fixedly arranged on the expanding culture tank 1, the gas inlet end of the gas distribution device 13 extends into the inner cavity 11 and is communicated with the inner cavity 11, the gas distribution device 13 is externally connected with the air blower 8, and oxygen is supplemented into the inner cavity 11 through the gas distribution device 13 by the air blower 8; the heating element 14 is also fixedly installed in the inner cavity 11, and the heating element 14 is externally connected with a power supply, so that the temperature of substances in the inner cavity 11 is changed through heating. In the present embodiment, since the air distribution device 13 and the heating element 14 are all common in the prior art, the description thereof is omitted herein, and only the drawing is schematically shown.

Wherein the heating element 14 will keep the substance in the inner chamber 11 in the temperature range of 30-40 c, in this embodiment it is preferred that the heating element 14 is capable of keeping the substance in the inner chamber 11 at a temperature of around 37 c.

In addition, the pH of the material in the cavity 11 should be within the range of 6.5-8.0, and in this embodiment, it is preferable that the pH of the material in the final cavity 11 after mixing of the materials is within the range of 6.5-7.0. In other embodiments, the pH of the contents of the chamber 11 may be controlled by means of a pH meter, an alkali dosing pump 7, etc., and by PID.

The expansion culture tank 1 is connected with the biological expansion culture tank 3 through a pipeline, and the inner cavity 11 is communicated with the second containing cavity 31 through a pipeline, so that the biological flora initially propagated in the expansion culture tank 1 can enter the second containing cavity 31.

Further, a metering pump 7 is preferably further installed on the pipeline between the expanding culture tank 1 and the biological expanding culture tank 3, and the metering pump 7 is used for controlling the quantity of the biological flora entering the biological expanding culture tank 3 from the expanding culture tank 1. In this embodiment, it is preferred that the metering pump 7 is capable of delivering the substance containing the biological flora in the inner chamber 11 into the second chamber 31 in timed and quantitative fashion. In other embodiments, the biological growth expanding tank 3 may also be provided with a detecting instrument for detecting concentration of biological bacteria in the second cavity 31, and the metering pump 7 can supplement appropriate amount of biological bacteria in the second cavity 31 at appropriate time according to data detected by the detecting instrument, so that the biological bacteria can be rapidly and stably propagated in large quantity in the second cavity 31, and meanwhile, the biological bacteria can have higher activity.

Referring to fig. 1, the biological growth tank 3 further has a plurality of suspended fillers 34 in the second chamber 31 to provide a place for propagation of biological flora, and the suspended fillers 34 are suspended in the material in the second chamber 31. The biological flora is attached to the suspended filler 34 and contacts with the desired substance as the suspended filler 34 moves, thereby achieving mass multiplication of the biological flora. In this embodiment, since the suspended filler 34 is a prior art in the field, it is not described here in detail, and only the description thereof is briefly shown in the drawings.

The biological growth tank 3 is provided with a third stirrer 32, in this embodiment, the third stirrer 32 is preferably a plug-flow stirrer, and the stirring impeller extends into the second cavity 31 near the bottom. The third stirrer 32 can form a certain plug flow strength when running, and can fully mix the mixed solution in the homogenizing tank 2 with the suspended filler 34 while keeping the biomembrane attached to the suspended filler 34, so as to form a working condition of combined treatment of a biomembrane method and an activated sludge method, and the suspended filler 34 is in a fluidization state in the mixed solution, thereby being beneficial to mass propagation of biological flora in the second accommodating cavity 31.

Referring to fig. 1 and 2, the biological growth tank 3 is further provided with an aeration device 33 for supplementing oxygen, and in this embodiment, the aeration device 33 is preferably a cyclone type aerator.

The aeration device 33 includes a main air pipe 331, a plurality of branch air pipes 332, and a plurality of cyclone cylinders 333, and the plurality of branch air pipes 332 are in one-to-one correspondence with the plurality of cyclone cylinders 333. The main air pipe 331 is fixedly installed relative to the biological expanding and culturing pond 3, is positioned above the second accommodating cavity 31, and is preferably installed along the horizontal direction; a plurality of bronchi 332 are vertically arranged below the main air pipe 331, one end of the bronchi 332 in the length direction is detachably connected with the main air pipe 331, and the bronchi 332 can be lifted upwards after being separated from the main air pipe 331, so that a worker can overhaul the bronchi 332 conveniently; the other end of the bronchus 332 in the length direction extends into the second chamber 31 and is close to the bottom of the second chamber 31. In this embodiment, the plurality of bronchi 332 are preferably equally spaced along the length of the main air tube 331.

In this embodiment, the bronchus 332 and the main air tube 331 are preferably detachably connected by a flange. Because the flange connection is a common detachable connection mode, detailed description is omitted in the drawings.

The one end that bronchus 332 kept away from main trachea 331 extends upwards along vertical direction after outwards extending along the horizontal direction, and the one end that bronchus 332 kept away from main trachea 331 wears to establish corresponding whirl section of thick bamboo 333, and whirl section of thick bamboo 333 and corresponding bronchus 332 fixed connection, and the axis of whirl section of thick bamboo 333 is vertical. The swirl tube 333 has a swirl passage 3331 therein, and the end of the bronchus 332 remote from the main air tube 331 communicates with the swirl passage 3331.

To facilitate the shaping of the bronchus 332, in this embodiment, the end of the bronchus 332 remote from the main air tube 331 is preferably detachably connected to the main body of the bronchus 332 by a flange.

In order to improve the stability of the position of the end of the bronchus 332 away from the main air tube 331 during the operation of the aeration device 33, in this embodiment, the end of the bronchus 332 away from the main air tube 331 is preferably kept stable in relative position with the biological growth pond 3 by the positioning seat 336. The positioning seat 336 is located in the second accommodating cavity 31, the positioning seat 336 is fixedly connected with the cavity wall at the bottom of the second accommodating cavity 31 and located below the horizontal section of the end, far away from the main air pipe 331, of the bronchus 332, and the horizontal section of the end, far away from the main air pipe 331, of the bronchus 332 is bound and fixed on the positioning seat 336 through a steel ring.

The bottom of the cyclone cylinder 333 is close to the cavity wall at the bottom of the second accommodating cavity 31, and a space exists between the bottom of the cyclone cylinder 333 and the cavity wall at the bottom of the second accommodating cavity 31. The opening of the swirl passage 3331 formed at the bottom of the swirl cylinder 333 is an inlet, and the opening formed at the top of the swirl cylinder 333 is an outlet.

The bottom of the cyclone cylinder 333 is provided with a filter screen 334 with mesh size smaller than the minimum size of the filler, and the inner wall of the cyclone cylinder 333 is smooth and not easy to be blocked; the cyclone cylinder 333 is rotatably provided with a plurality of conical impellers 335 with a plurality of protruding points on the surface at the position of the cyclone channel 3331 near the outlet, and the rotation axis of the conical impellers 335 is coincident with the axis of the cyclone cylinder 333.

One end of the main air pipe 331 is externally connected with an air source, and the air source blows air into the rotational flow channel 3331 through the main air pipe 331 and the plurality of branch air pipes 332 in sequence, so that oxygen can be supplemented into the second accommodating cavity 31, and the requirement of mass propagation of biological flora in the second accommodating cavity 31 is met.

After the gas is blown into the cyclone channel 3331, the liquid is driven to flow upwards along the cyclone channel 3331, so that the plurality of conical impellers 335 rotate along with the liquid, and the gas-liquid mixed flow can be lifted and cut, the sludge mass is crushed, and a large number of microbubbles are generated. Meanwhile, the liquid leaving the cyclone channel 3331 from the outlet forms a descending circulation around the cyclone cylinder 333, and the descending circulation can bring microbubbles to all corners in the second cavity 31, so that the aeration device 33 aerates uniformly in the second cavity 31, and the oxygen dissolution rate of the liquid in the second cavity 31 is improved.

In addition, the aeration device 33 combines with the third stirrer 32 to keep the suspended filler 34 in the second containing cavity 31 in a suspended state, and has a certain turning effect on the suspended filler 34, so that the biological film of the suspended filler 34 is ensured to be fully contacted with various substances in the second containing cavity 31, and mass propagation of biological flora in the second containing cavity 31 and degradation of pollutant substances in the second containing cavity 31 are promoted.

The implementation principle of the biological expanding and cultivating integrated equipment provided by the embodiment of the application is as follows:

after the biological flora is initially propagated in the expanding culture tank 1, the biological flora enters the biological expanding culture tank 3 through the metering pump 7 for mass propagation, and the mass propagated biological flora enters subsequent wastewater treatment equipment together with the pretreated wastewater, so that the biological flora is continuously provided for subsequent wastewater treatment, and the effect of removing ammonia nitrogen from the wastewater is realized; meanwhile, the biological flora participating in wastewater treatment flows back to the homogenizing pool 2 along with sludge, and then enters the biological expanding culture pool 3 from the homogenizing pool 2, so that the stability of beneficial biological flora in the system is ensured.

Example 2:

referring to fig. 1 and 3, the present embodiment is different from embodiment 1 in the culture pot 1.

Referring to fig. 3, the first stirrer 12 is centrally installed in the inner cavity 11, and the axis of stirring of the first stirrer 12 coincides with the axis of the culture expansion tank 1, so that the stirring effect of the first stirrer 12 on the substances in the inner cavity 11 is more uniform, and serious stirring dead angles are reduced.

The air distribution device 13 comprises a first air pipe 131 and a plurality of second air pipes 132, wherein the first air pipe 131 is fixedly arranged outside the expanding culture tank 1 and is positioned above the inner cavity 11; the second air pipes 132 are vertically installed below the first air pipe 131, and one ends of the second air pipes 132, which are far away from the first air pipe 131, extend into the inner cavity 11 and are close to the cavity wall at the bottom of the inner cavity 11. The first air pipe 131 is fixedly provided with the air blower 8 for supplying air, the air blower 8 is also positioned outside the expanding culture tank 1, and the air blower 8 runs through the first air pipe 131 and the plurality of second air pipes 132 and is fed into the inner cavity 11, so that air distribution is realized.

In this embodiment, the overall track of the first air tube 131 is preferably annular, the cross section of the first air tube 131 is preferably square, and the first air tube 131 is preferably rotatably connected with the culture expansion tank 1. The first air tube 131 surrounds the first agitator 12, and the axis of rotation of the first air tube 131 coincides with the axis of itself and coincides with the axis of the first agitator 12.

After the plurality of second air pipes 132 are installed on the first air pipe 131, the plurality of second air pipes 132 are respectively close to different peripheral side cavity walls of the inner cavity 11, and the plurality of second air pipes 132 are distributed in a circumferential array by taking the axis of the first air pipe 131 as an axis.

In this embodiment, preferably, the first air tube 131 is also driven to rotate relative to the biological growth tank 3 during the operation of the first stirrer 12, and the rotation direction of the first air tube 131 is opposite to the stirring direction of the stirring impeller. In this embodiment, the motor of the first stirrer 12 and the first air tube 131 preferably realize synchronous reverse rotation through a gear set, and the above application of the gear set is common prior art, so that the description is omitted herein, and only the description is briefly shown in the drawings.

In the process of the operation of the first stirrer 12, the first air pipe 131 rotates along with the first air pipe to drive the second air pipes 132 to move so as to stir the substances in the inner cavity 11, thereby further improving the mixing effect of various substances in the inner cavity 11, further helping the biological flora to realize preliminary propagation in the inner cavity 11 and improving the activity of the biological flora.

The second air tube 132 has a plurality of air holes 1321 formed on a peripheral side of an end far from the first air tube 131, and the air entering the second air tube 132 from the first air tube 131 can enter the bottom of the inner cavity 11 through the plurality of air holes 1321.

Referring to fig. 3 and 4, the second air tube 132 is provided with a stirring member 15 at an end far from the first air tube 131, and the stirring member 15 is provided with a plurality of bristles 151 having elastic deformability, and in this embodiment, the stirring member 15 is preferably made of rubber as a whole. The end of the bristle 151 away from the second air tube 132 abuts against the wall of the bottom of the inner cavity 11, and is pressed by the wall of the bottom of the inner cavity 11 to maintain a bent state.

The expanding culture tank 1 is also provided with a plurality of bulges 111 on the cavity wall at the bottom of the inner cavity 11, and the bulges 111 are distributed along the movable track of the stirring piece 15 along with the movement of the second air pipe 132. During the movement of the stirring member 15, the bristles 151 will be sequentially contacted with the protrusions 111 and separated. During the contact of the bristles 151 with the protrusions 111, the bristles 151 will be further bent and deformed by the extrusion of the protrusions 111; after the bristles 151 are separated from the protrusions 111, the bristles 151 will again abut against the cavity wall at the bottom of the inner cavity 11 under the self elastic deformation recovery trend, so as to stir the substances deposited at the bottom of the inner cavity 11, realize stirring effect on the substances, and further improve the mixing effect of various substances in the inner cavity 11.

Further, it is preferable that the second air tube 132 is rotatably connected to the first air tube 131, and the rotation axis of the second air tube 132 coincides with the axis of itself; and preferably, the protrusions 111 are distributed in a dislocation manner relative to the moving track of the center of the second air tube 132, that is, only one part of the bristles 151 on one side of the stirring member 15 can be sequentially contacted with a plurality of protrusions 111 and then separated during the moving process of the second air tube 132. In the process that the stirring piece 15 moves along with the movement of the second air pipe 132, the acting force of the protrusion 111 on part of the bristles 151 drives the stirring piece 15 to drive the second air pipe 132 to rotate relative to the first air pipe 131, so that the direction of air entering the inner cavity 11 from the plurality of air holes 1321 is continuously changed, the air distribution effect of the air distribution device 13 in the inner cavity 11 is more uniform, and the preliminary propagation of biological flora in the inner cavity 11 can be further assisted.

the first stirrer 12 stirs and mixes the substances in the inner cavity 11, and the first air pipe 131 rotates along with the substances to drive the plurality of second air pipes 132 to stir the substances in the inner cavity 11, so as to stir the substances deposited at the bottom of the inner cavity 11, thereby improving the mixing effect of a plurality of substances in the inner cavity 11, improving the probability of contact between the biological flora and the substances required by propagation of the biological flora, further being beneficial to preliminary propagation of the biological flora in the inner cavity 11 and improving the activity of the biological flora in the inner cavity 11;

Meanwhile, in the process that the second air pipe 132 moves along with the rotation of the first air pipe 131, the second air pipe 132 rotates relative to the first air pipe 131, so that the air distribution effect of the air distribution device 13 in the inner cavity 11 is improved; in addition, the biological flora can be distributed more uniformly in the inner cavity 11, so that the biological flora can be propagated under the condition that the biological flora is more suitable for propagation and keeps high activity, and further the preliminary propagation of the biological flora in the inner cavity 11 can be realized quickly and stably.

Example 3:

referring to fig. 5, the embodiment of the application also discloses a wastewater treatment process, which is based on the biological expanding culture integrated equipment as described in embodiment 1 or embodiment 2, and specifically comprises the following steps:

s1, wastewater pretreatment, and reducing impurities in wastewater.

The wastewater is pretreated by the pretreatment unit, solid-liquid separation, oil-liquid separation and the like are realized by adopting a gravity separation or centrifugal separation mode, impurities in the wastewater are reduced, and the wastewater with lower solid content and lower oil content is obtained and sent to the next step.

S2, the wastewater enters biological expansion and culture integrated equipment and is mixed with biological flora.

The pretreated wastewater is sent into biological expanding and cultivating integrated equipment and is fully mixed with the biological flora after expanding and cultivating.

It should be noted that when the two-stage A/O system at the rear end adopts the nitrification and denitrification process, the wastewater is preferably in the biological expansion tank 3 in the biological expansion integrated equipment, and the dissolved oxygen is controlled to be 2-4mg/l.

When the rear-end two-stage A/O system adopts a short-cut nitrification and denitrification process, the dissolved oxygen is preferably controlled to be 0.7-1mg/l in a biological expanding culture pond 3 in the biological expanding culture integrated equipment.

S21, adding microorganisms and nutrient substances into the expansion culture tank 1 to enable the microorganisms to be primarily propagated in the inner cavity 11.

Adding biological flora, pretreated wastewater, nutrient substances and the like into the expansion tank 1, stirring and mixing various substances in the inner cavity 11 by the first stirrer 12, and providing proper oxygen conditions and temperature conditions for preliminary propagation of the biological flora in the inner cavity 11 by the gas distribution device 13 and the heating element 14 so as to quickly and stably realize the preliminary propagation of the biological flora in the inner cavity 11.

S22, the wastewater enters the homogenizing pool 2, and nutrient substances are added into the homogenizing pool 2.

When the pretreated wastewater enters the homogenizing tank 2, the liquid obtained by exceeding the raw water enters the homogenizing tank 2, the liquid obtained by regulating the ratio of C to N to P, which is the liquid obtained by regulating the ratio of C to N to P, is supplemented into the homogenizing tank 2, so that the mixture of various substances in the homogenizing tank 2 has the condition suitable for biological flora propagation, and the ratio of C to N to P in the homogenizing tank 2 is controlled within the range of 20:5:1 to 25:5:1.

Meanwhile, part of nitrifying liquid generated in the two-stage A/O treatment process and part of sludge generated by filtration of the ultrafiltration system also flow back into the homogenizing tank 2, and part of high-activity biological flora also enters into the homogenizing tank 2 along with the sludge.

In addition, nutrient substances for adjusting the carbon-nitrogen ratio are fed into the homogenizing tank 2, and the plurality of substances in the first chamber 21 are stirred and mixed by the second stirrer 22.

S23, mixing the wastewater with other substances in the homogenizing tank 2, then entering the biological expanding culture tank 3, and allowing the microorganisms initially propagated in the expanding culture tank 1 to enter the biological expanding culture tank 3 for mass propagation.

The liquid formed by mixing the substances in the first containing cavity 21 enters the second containing cavity 31 through the communication port 4, meanwhile, the liquid of which the primary propagation of a part of biological flora in the inner cavity 11 is controlled by the metering pump 7 enters the second containing cavity 31, and the substances in the second containing cavity 31 are stirred and mixed by the third stirrer 32.

Meanwhile, the aeration device 33 provides proper oxygen conditions for the propagation of the biological flora in the second accommodating cavity 31, and the plurality of suspended fillers 34 also provide proper places for the propagation of the biological flora, so that the biological flora can be rapidly and stably propagated in the second accommodating cavity 31.

S3, two-stage A/O treatment is carried out to remove COD and total nitrogen from the wastewater.

The liquid formed by mixing the substances in the second containing cavity 31 enters the equipment for two-stage A/O treatment through the communication port 4. Wherein, the two-stage A/O treatment equipment is divided into four areas of a primary denitrification area, a primary nitrification area, a secondary denitrification area and a secondary nitrification area. Wherein, install online pH instrument and ORP instrument in the denitrification zone, install DO appearance in the nitration zone, be convenient for the staff to control the environment in the two-stage A/O processing system, make biological flora keep higher activity in the two-stage A/O processing system.

It should be noted that the time of the wastewater subjected to the two-stage A/O treatment is preferably 8-12d, the treatment time of the wastewater in the biological expansion integrated equipment is preferably 2:8 in proportion to the treatment time of the wastewater in the two-stage A/O treatment equipment, and the treatment time proportion of four areas in the two-stage A/O treatment equipment is 2:4:1:1.

Among them, the oxygen dissolving in the anoxic tank in the two-stage A/O is preferably controlled at 0.5mg/l, and the oxygen dissolving in the aerobic tank is preferably controlled at 2-4mg/l.

The two-stage A/O treatment system can adjust the air inflow of the aeration system through a valve, so that the concentration of dissolved oxygen in the two-stage A/O treatment system is controlled, the dissolved oxygen in the primary nitrification zone is controlled to be 0.4-0.6mg/l, the dissolved oxygen in the secondary nitrification zone is controlled to be 0.7-1.0mg/l, the environment of dissolved oxygen in the two-stage A/O treatment system is suitable for the growth and propagation of ammonia oxidizing bacteria, the oxidation reaction of ammonia nitrogen is controlled in the nitrosation stage, and the generated nitrite is directly used as an electron hydrogen acceptor to perform denitrification, so that the aim of short-cut nitrification and denitrification is fulfilled, and the energy and consumption are saved in the operation process.

S4, filtering and separating by an ultrafiltration system to realize solid-liquid separation, and refluxing part of sludge into the homogenizing tank 2.

The ultrafiltration system performs deep solid-liquid separation on the wastewater subjected to the two-stage A/O treatment, and returns part of sludge to the homogenizing pool 2 and the other part of sludge to the two-stage A/O treatment equipment, so that the two-stage A/O treatment equipment is supplemented with high-activity biological flora, and the utilization rate of the biological flora is improved.

After the wastewater is treated by the ultrafiltration system, the liquid and the sludge are respectively sent to different equipment for different treatments.

S5, respectively treating the separated solid and liquid.

S51, deeply treating the membrane to enable the effluent to reach the standard.

The liquid is sent to a membrane advanced treatment unit for treatment, so that the finally obtained liquid meets the discharge standard, and the pollution of wastewater discharge to water is reduced.

S52, dehydrating and discharging the sludge.

The sludge is firstly sent to a sludge pool, then solid-liquid separation is further realized through a sludge dehydrator, and finally the obtained sludge with lower water content is transported outwards or burned.

In this embodiment, the pretreatment unit, the two-stage a/O treatment, the ultrafiltration system and the membrane advanced treatment unit are all common prior art in the field, and therefore will not be described herein.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. The biological expansion and cultivation integrated equipment is characterized by comprising an expansion and cultivation tank (1), a homogenizing tank (2) and a biological expansion and cultivation tank (3), wherein an inner cavity (11) for preliminary propagation of biological flora is formed in the expansion and cultivation tank (1), a first containing cavity (21) for mixing various substances is formed in the homogenizing tank (2), a second containing cavity (31) for mass propagation of the biological flora is formed in the biological expansion and cultivation tank (3), the homogenizing tank (2) is connected with the biological expansion and cultivation tank (3), and the first containing cavity (21) is communicated with the second containing cavity (31); the expansion culture tank (1) is connected with the biological expansion culture pond (3), and the inner cavity (11) is communicated with the second containing cavity (31);

the culture expansion tank (1) is provided with a first stirrer (12), a gas distribution device (13) and a heating element (14), wherein the first stirrer (12) is used for stirring substances in the inner cavity (11), and the gas distribution device (13) and the heating element (14) are arranged in the inner cavity (11);

A second stirrer (22) is arranged on the homogenizing pool (2), and the second stirrer (22) is used for stirring substances in the first accommodating cavity (21);

an aeration device (33), a third stirrer (32) and a plurality of suspended fillers (34) are arranged on the biological expanding culture pond (3), the aeration device (33) comprises a main air pipe (331) and a plurality of branch air pipes (332), the main air pipe (331) is positioned above the second accommodating cavity (31), one end of the branch air pipe (332) is detachably connected and communicated with the main air pipe (331), and the other end of the branch air pipe (332) is positioned in the second accommodating cavity (31) and communicated with the second accommodating cavity (31); the third stirrer (32) is used for stirring the substances in the second containing cavity (31); the suspension filler (34) is located in the second cavity (31) and suspended in the second cavity (31).

2. The integrated biological growth and cultivation equipment according to claim 1, further comprising a metering pump (7), wherein two ends of the metering pump (7) are respectively connected with the growth and cultivation tank (1) and the biological growth and cultivation tank (3), and two ends of the metering pump (7) are respectively communicated with the inner cavity (11) and the second containing cavity (31).

3. The integrated biological expanding and culturing device according to claim 1, wherein the air distribution device (13) comprises a first air pipe (131) and a plurality of second air pipes (132), the first air pipe (131) is positioned above the inner cavity (11), one end of the second air pipe (132) is communicated with the first air pipe (131), the other end of the second air pipe (132) is close to the bottom of the inner cavity (11), and a plurality of air holes (1321) communicated with the inner cavity (11) are formed in one end of the second air pipe (132) away from the first air pipe (131); the first stirrer (12) is arranged centrally relative to the inner cavity (11), and a plurality of second air pipes (132) are arranged around the first stirrer (12).

4. A bio-expanding integrated device according to claim 3, wherein the first air tube (131) is ring-mounted and the first air tube (131) surrounds the first stirrer (12); the first air pipe (131) is rotationally connected with the expanding culture tank (1), the rotation axis of the first air pipe (131) coincides with the axis of the first stirrer (12), and the first air pipe (131) synchronously rotates reversely along with the stirring of the first stirrer (12).

5. The integrated biological growth and propagation device according to claim 4, wherein the end of the second air tube (132) far away from the first air tube (131) is provided with a stirring piece (15), the stirring piece (15) comprises a plurality of bristles (151) with elastic deformation capability, and the bristles (151) are propped against the cavity wall at the bottom of the inner cavity (11) and are deformed by extrusion and bending.

6. The integrated biological cultivation and propagation device according to claim 5, wherein the cultivation and propagation pot (1) is provided with a plurality of protrusions (111) on the wall of the bottom of the inner cavity (11), the protrusions (111) are distributed along the moving track of the stirring piece (15), and the protrusions (111) are contacted with the bristles (151) in the moving process of the stirring piece (15).

7. A biological growth integrated device according to claim 6, characterized in that said second air duct (132) is perpendicular to said first air duct (131), said second air duct (132) is in rotary connection with said first air duct (131), and the axis of rotation of said second air duct (132) coincides with the axis of itself; after the stirring piece (15) is contacted with the bulge (111), the acting force of the bulge (111) on the stirring piece (15) drives the second air pipe (132) to rotate.

8. A wastewater treatment process, characterized by being based on a biological expanding culture integrated device according to any one of claims 1-7, comprising the following specific steps:

s1, wastewater pretreatment, which reduces impurities in wastewater;

s21, adding microorganisms and nutrient substances into the expansion culture tank (1) to initially reproduce the microorganisms in the inner cavity (11);

s22, enabling the wastewater to enter the homogenizing pool (2), and adding nutrient substances into the homogenizing pool (2);

s23, mixing the wastewater in the homogenizing tank (2) with other substances, then entering the biological expanding culture tank (3), and allowing the microorganisms initially propagated in the expanding culture tank (1) to enter the biological expanding culture tank (3) for mass propagation;

s4, filtering and separating by an ultrafiltration system to realize solid-liquid separation, and refluxing part of sludge into the homogenizing pool (2);

s5, respectively treating the separated solid and liquid;

s51, deeply treating the membrane to enable the effluent to reach the standard;

s52, dehydrating and discharging the sludge.

9. A wastewater treatment process according to claim 8, characterized in that part of the nitrified liquid produced by the two-stage a/O treatment in S3 is returned to the homogenizing tank (2).

10. The wastewater treatment process according to claim 8, wherein the liquid obtained by overrunning the raw water in S2 is introduced into the biological expansion and culture integrated equipment together with the wastewater, so that the substances in the homogenizing tank (2) are more suitable for biological flora propagation.