CN111039394A

CN111039394A - Powder-reinforced SBR sewage biochemical treatment method

Info

Publication number: CN111039394A
Application number: CN202010004996.9A
Authority: CN
Inventors: 柴晓利; 陆斌; 戴晓虎; 武博然; 汪秀仲
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2020-01-03
Filing date: 2020-01-03
Publication date: 2020-04-21

Abstract

A method for biochemical treatment of sewage by a powder reinforced SBR method comprises the following steps: selecting a proper powder carrier, removing impurities with a coarse particle size, adding water or wastewater to prepare the powder carrier into slurry, so that the powder carrier completely absorbs moisture and does not cake and float upwards; adjusting the pH value of the soaked powder slurry to be proper; the powder slurry after soaking and moisture absorption is completely added into a bioreactor or a biological reaction structure, so that the added powder carrier is uniformly distributed in the bioreactor; microorganisms in the bioreactor wrap the surface of the powder carrier through adhesion to form biological floccules with a core, finally, microbial powder particles pass through a biological reaction zone and are finally precipitated in a precipitation section, and the powder carrier and the microorganisms are separated and recycled in discharged sludge, so that the cyclic utilization of the powder carrier is realized. The invention improves the removal efficiency of the refractory substances in the sewage and improves the effluent quality.

Description

Powder-reinforced SBR sewage biochemical treatment method

Technical Field

The invention belongs to the field of sewage treatment, and relates to a method for biochemical treatment of sewage by a powder reinforced SBR method.

Background

At present, with the rapid development of industry and agriculture, the amount of sewage generated in life is increased rapidly, and the pollutants required to be treated in water are increased day by day and are in a great variety. Because the pipe network construction of our country falls behind, still have some sewage to insert at present and accept the pipe, if accept the operating pressure that sewage factory must be increased to sewage factory with these sewage later stage. With the increasing deterioration of the environment and the increasing emphasis on the living environment of human beings, the discharge standard of sewage plants continues to increase. However, since the sewage plant has a limited design load and cannot receive excessive external sewage, it is urgently necessary to expand or build sewage treatment facilities to meet the increasing demand. Based on the national conditions of numerous Chinese population and shortage of urban land resources, the increase of income for building or expanding sewage treatment facilities leads to the increase of initial investment and construction cost. Therefore, there is an urgent need for a technology for improving the treatment capacity of an existing structure without substantially changing the existing sewage treatment structure. Certainly, China has a wide population distribution, and the caused pollution sources are too high in construction cost if being connected to the grid together and are not economical. Therefore, an efficient treatment technology is urgently needed to miniaturize treatment facilities and carry out efficient treatment under a certain effective volume so as to reduce the occupation of land resources. In natural environment, more powder with extremely small grain diameter and large specific surface area exists, and the Chinese reserves are abundant.

The SBR treatment Process is a sewage treatment Process which is commonly used in recent years, is a short name of a sequence Batch Reactor Activated Sludge Process (SBR), is an Activated Sludge sewage treatment technology which operates in an intermittent aeration mode, is a wastewater biological treatment Activated Sludge Process which degrades pollutants such as organic matters, ammonia nitrogen and the like under an aerobic condition by using suspended growing microorganisms, is carried out in the intermittent aeration mode according to a time sequence, changes the growth environment of Activated Sludge, is a wastewater treatment Process which is widely accepted and used in the world, has the characteristics of cost saving and high organic matter removal efficiency, can also carry out nitrification and denitrification processes in different time periods in the same Reactor and complete a denitrification Process, but has a plurality of technical problems in the existing SBR treatment Process: the SBR treatment process has poor effect of removing nitrogen and phosphorus, and if the SBR is directly discharged into the environment without treatment, eutrophication of a water body is easily caused, so that the aim of maximizing the sewage treatment effect cannot be achieved; part SBR treatment process does not set up idle stage, so the activated sludge who has advanced sewage treatment at every turn needs to discharge outside the SBR pond, and the SBR pond that is located underground then needs extra extraction facilities to extract activated sludge and handles, and the SBR pond that is located underground also can have the problem that the sewage after handling needs to extract the equipment extraction simultaneously, also needs extra space to place equipment etc. when causing the wasting of resources.

Some powders such as hydrotalcite, diatomite, zeolite powder and the like are very suitable for the attachment of microorganisms due to the tiny pore size and large specific surface area, and can effectively improve the concentration of the microorganisms in the device. The microorganism concentration is improved, the bacteria are promoted to secrete extracellular polymeric substances, a flocculating body structure with a powder mosaic structure is formed, the sludge is tightly combined, and the sedimentation capability is enhanced to a certain extent. The powder is added in the SBR process, so that the sludge concentration can be effectively improved, the effluent quality is improved, the process is simple and feasible to modify, and the method has huge potential in application. The invention is based on the traditional SBR process, and adds powder to the SBR process for strengthening, thereby providing an improved scheme of the sewage treatment process with high efficiency, no pollution and strong applicability.

Disclosure of Invention

The invention aims to provide a sewage biochemical treatment process which is efficient, pollution-free and strong in applicability.

In order to solve the technical problems, the invention adopts the following technical scheme:

a high-efficiency, pollution-free and highly applicable biochemical sewage treatment process comprises the following steps: selecting proper powder carriers, removing impurities with a screen mesh, adding water or wastewater, preparing the powder carriers into slurry through slow stirring, enabling the powder carriers to absorb moisture completely without agglomeration and floating, adjusting the pH of the soaked powder slurry to be neutral or slightly alkaline by using chemical substances such as acid, alkali, salt and the like, or continuously replacing slurry supernatant to restore the pH of the powder slurry to be neutral or slightly alkaline, adding the neutral powder slurry after soaking and absorbing moisture completely into a bioreactor or a biological reaction structure, uniformly distributing the added powder carriers into the bioreactor through various hydraulic stirring actions, adding the powder carriers at multiple points when the adding amount is large so as to facilitate diffusion, wrapping microorganisms in the bioreactor on the surfaces of the powder carriers through adhesion, namely attaching biofilms on the surfaces of the powder carriers to form biological flocs with nuclei, finally, the microorganism powder particles are finally precipitated in a precipitation section through a biological reaction zone, and the powder carrier and the microorganisms are separated and recycled in the discharged sludge, so that the cyclic utilization of the powder carrier is realized, and the environmental pollution is greatly reduced.

Further, a powder reinforced SBR sewage biochemical treatment method, which comprises the following steps:

s1, determining the type of a powder carrier to be added, weighing the mass to be added, and soaking the powder carrier after sieving a mesh to completely absorb moisture to obtain slurry;

s2, adjusting the pH value of the soaked powder slurry to be neutral or slightly alkaline;

s3, feeding the powder slurry after pH adjustment into a bioreactor or a building;

s4, uniformly diffusing the added slurry into the bioreactor under the action of water power;

s5, attaching the microorganisms in the bioreactor in the inner pore diameter of the powder carrier and forming an attached biomembrane on the surface of the powder carrier to generate biological floccule particles with a sinking nucleus;

s6, biochemically degrading the pollutants by the biological flocs in a biological reaction section, discharging the powder carrier concentrated by gravity settling in a settling period and the part of the carried microorganism out of the reactor, and repeatedly adding the powder for use by heating, burning and the like.

It should be noted that: the operation sequence in the steps S1, S2 and S3 is not unique, and besides the sequence, the powder can be directly added into the reactor and then soaked by the sewage in the device, namely the operation is carried out according to the sequence of the steps S2-S3-S1; furthermore, the slurry or powder can be added into the reactor, and then the pH value in the reactor is adjusted, namely, the steps S1-S3-S2 or the steps S3-S1-S2 are carried out in sequence.

The operation sequence of the steps S3 and S5 is not exclusive, except that a powder carrier is added into the reactor to granulate the biological flocs, namely the operations are carried out according to the sequence of the steps S3 to S5; mature powder carrier floc inoculated with the microbial inoculum can also be added, namely the operation is carried out according to the sequence of the steps S5-S3.

Further, in step S1, the mesh used for the filtration is a mesh of 250 mesh or larger, or a powder carrier of 250 mesh or larger is used as it is.

Further, in step S1, the action of the solvent such as water or wastewater added is used only for dissolving the powder carrier, and the amount of the solvent added is not fixed, so that the powder carrier is completely wetted.

Further, in step S2, the pH of the soaked powder slurry is adjusted to neutral or slightly alkaline with chemicals such as acid, alkali, salt, etc., or the pH of the powder slurry is returned to neutral or slightly alkaline by continuously replacing the slurry supernatant, and the pH range is 7 to 8.

Furthermore, in step S3, the slurry adding position can be any position, and the concentration of the powder carrier in the added structure is between 6g/L and 20 g/L.

Further, in step S4, after the slurry is added into the bioreactor, according to the actual situation, the slurry can be uniformly distributed in the bioreactor by any hydraulic action such as bubble disturbance generated by aeration and oxygenation, hydraulic action caused by rotation of a stirrer blade, or water exchange caused by gravity, and the like, and the powder carrier is continuously disturbed without sedimentation. The aeration intensity has certain difference due to different powder types and concentrations, and the surface dissolved oxygen concentration is generally controlled to be more than 2mg/L after the water body is stirred.

Further, in step S5, the original microbes in the added microbial inoculum, structures or influent water randomly collide with the powder carrier through the hydraulic action, so that the microbes adhere to the powder carrier with micro-pores, part of the microbes fill the inner pores of the powder carrier, and a biofilm is attached to the surface of the powder carrier, thereby forming biological flocs with nuclei.

Further, in step S6, the formed microorganism powder particles are reacted and decomposed by organic substances in the sewage according to the original sewage process flow, and then are rapidly settled due to the good settling property of the microorganism powder particles in the settling stage of the sequencing batch reaction. After the mixed liquid is subjected to primary mud-water separation, the biological flocs carried by the discharged powder are separated from the activated sludge component and the powder carrier by a separator. The whole reaction period is controlled to be about 6 hours, namely the theoretical hydraulic retention time, wherein the precipitation process can be regarded as complete precipitation within 0.5 hour generally due to the strong adhesive action between the microorganisms and the powder, and the supernatant is separated out to be treated effluent.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the invention relates to a method for biochemical treatment of sewage by a powder reinforced SBR method, which selects a certain amount of powder carriers to be added and uses a screen to remove impurities with coarse grain diameter. Adding water or waste water and other solvent, slowly stirring to dissolve the powder carrier to obtain slurry, so that the powder carrier can completely absorb moisture and float without agglomeration. Since partial powder carrier is dissolved in water and causes a rapid change in solution pH, the pH of the soaked powder slurry is adjusted to neutral by using chemicals such as acid, alkali, salt, etc., or the pH of the powder slurry can be restored to neutral by continuously replacing the slurry supernatant, and the neutral powder slurry after soaking and moisture absorption is completed can be fed into a bioreactor or a biological reaction structure. The added slurry is uniformly distributed in the bioreactor under various hydraulic stirring actions, and the hydraulic action needs to be continuously stirred to uniformly distribute the slurry due to better settling property of part of powder carriers. The microorganism in the bioreactor is wrapped on the surface of the powder carrier through adhesion and loaded in the inner pore diameter of the powder carrier, namely, a biological film is attached to the surface of the powder carrier to form biological floc with a sinking nucleus. The biological flocs carried by the powder pass through a biological reaction zone and are finally precipitated in a precipitation zone, and the powder carrier and the microorganisms are separated by a separator and then recycled.

The process has strong adaptability to low-concentration wastewater and high-concentration wastewater, and is suitable for developing small-sized high-efficiency equipment for treating various trapped sewage. And is also suitable for upgrading and transforming projects of some sewage plants. By adding a plurality of micro powder carriers, the method has the advantages of obviously improving the concentration of the original microorganisms, improving the removal rate of refractory organic matters or TOC, improving the formation of sludge floc, increasing the removal rate of inorganic matters and the like. The formed microorganism micro powder particles have heavier specific gravity, so the sedimentation rate is high, the sedimentation performance is good, the sludge is compact, and after the micro powder is added, the microorganisms can be effectively reserved in the process, the biological chain is promoted to be prolonged, various problems generated by subsequent sludge treatment are effectively reduced, and the process is more green and environment-friendly.

Drawings

FIG. 1 is a schematic flow chart of the powder-enhanced SBR sewage biochemical treatment method of the present invention.

Detailed Description

The invention relates to a method for biochemically treating sewage by a powder reinforced SBR method, which comprises the following steps:

selecting a certain amount of powder carriers to be added, removing impurities with coarse grain size by using a 250-mesh screen, wherein the screened powder carriers can be used for adding. Measuring and calculating the effective volume of the bioreactor or a structure, wherein the total adding concentration of different micro powder is different, and adding the micro powder according to the adding concentration of 2-4 g/L.

Weighing a powder carrier with corresponding mass, adding solvents such as water or wastewater, dissolving the powder carrier by slow stirring to prepare slurry, soaking for more than 24h to ensure that the powder carrier completely absorbs moisture, and performing subsequent slurry feeding without agglomeration and floating. The pH value of the water body is changed rapidly after a part of powder carriers are added, the pH value of the soaked powder slurry is adjusted to be neutral by chemical substances such as acid, alkali, salt and the like, the pH value of the powder slurry can be slowly recovered to be neutral by continuously replacing the supernatant of the slurry, and the neutral powder slurry after being soaked and completely absorbed moisture is added into a bioreactor or a biological reaction structure. The added slurry is uniformly distributed in the bioreactor under various hydraulic stirring actions, and the hydraulic action needs to be continuously stirred to uniformly distribute the slurry due to better settling property of part of powder carriers.

The microorganisms in the bioreactor are loaded in the inner pore diameter of the powder carrier and are wrapped on the surface of the powder carrier through adhesion, namely, a biological film is attached to the surface of the powder carrier to form biological flocs with a sinking nucleus. The biological flocs carried by the powder are precipitated in a precipitation zone after being treated by the biological reaction zone, and the powder carrier and the microorganisms are separated by a separator for recycling.

Powder material (diatomite, active carbon, fly ash, etc.)	Numerical value
		Particle size	< 58 μm
Internal surface area	30-70m²/g
		Loss on ignition	0～40％
Bulk density	0.1-1.0g/m³
		Amount of addition	2-4g/L
Particle properties of biological powder	Numerical value
		Mixed solution suspended solid concentration (MLSS) (mg/L)	6000～20000
Mixed liquor volatile suspended solids concentration (MLVSS) (mg/L)	2000～7000
		Sludge sedimentation ratio (SV) (%)	20～50
Sludge Volume Index (SVI) (mL/g)	30～90

The present invention will be described in further detail with reference to examples.

Example 1

Diatomite is used as a powder carrier loaded by microorganisms, the device process is 'SBR process + powder enhanced biochemical water treatment', common urban sewage is treated, COD is 120mg/L, TN is 25mg/L, the enhanced denitrification effect is required to be achieved, and the total nitrogen is stably reduced to 10 mg/L. The total effective volume in the SBR original device is designed to be 14m³Adding the powder carrier according to the adding concentration of 2g/L, and comprising the following steps:

(1) calculating to obtain 30kg of diatomite to be added. Sieving the diatomite ore ground by a 300-mesh sieve to obtain 30kg of diatomite, and soaking the diatomite in the raw sewage water for more than 12 hours to ensure that the diatomite does not agglomerate and float upwards;

(2) as the pH of the slurry is sharply reduced after the diatomite is added, other alkaline substances such as fly ash or sodium hydroxide and the like can be added to restore the pH of the slurry to be in the range of 7-7.3;

(3) quantitatively adding the soaked slurry with complete moisture absorption into an SBR device which finishes sludge inoculation in an aeration stage by the amount meeting the concentration of 200ppm of the tank body every day, uniformly distributing diatomite powder in the slurry into the device through an original aeration device and a stirring device, and controlling the concentration of dissolved oxygen in water on the surface of a biochemical tank to be 2-3mg/L for at least 30 minutes by the aeration amount, namely regarding that the diatomite powder is completely mixed;

(4) because the device contains microorganisms or microorganisms in the inlet water, the microorganisms are loaded in the micropores of the diatomite, and finally, a biological film is formed on the surface of the diatomite molecules through proliferation and amplification to generate biological diatomite flocs, the stable operation is generally maintained for 7 days, the MLSS concentration in the biochemical pool can be increased from 4000mg/L to 9000-12000mg/L, and the quality of the outlet water can be reduced to TN-8 mg/L;

(5) biological powder particles are subjected to biological reaction for 3 hours in an aerobic section and 1 hour in an anoxic section, finally, the biological powder particles are subjected to gravity precipitation in a precipitation section, after the sludge is discharged and diatomite and microorganisms are subjected to centrifugal separation through a separator, the lower-layer separation liquid is heavier, more inorganic diatomite is contained in the lower-layer separation liquid, the lower-layer separation liquid flows back to the SBR device to be reused as the diatomite, and more diatomite does not need to be additionally added.

Testing the water outlet results before and after SBR process modification:

test items	After transformation	Before transformation
			COD removal Rate/%)	90％	85％
TN removal rate/%)	70％	55％

Example 2

To use diatomaceous earth as a powder carrier for microbial loading,the original SBR process is improved to be a process of 'SBR process and powder reinforced biochemical water treatment', and the total effective volume in the device is measured to be 8m³Adding the powder carrier according to the adding concentration of 3g/L, and comprising the following steps:

(1) calculating to obtain 24kg of diatomite to be added, and sieving with a 250-mesh sieve to obtain 24kg of diatomite;

(2) adding diatomaceous earth directly into the solution with effective volume of 8m³In the cylindrical SBR equipment, under the condition of clear water, starting a stirrer and aeration equipment to uniformly distribute the diatomite into the cylindrical equipment, and simultaneously enabling the diatomite to completely absorb moisture, wherein the liquid level has no floating particles, the concentration of dissolved oxygen is generally controlled to be 2mg/L and the time lasts for 2 hours;

(3) closing the aeration and stirring equipment, performing alkali feeding operation on the equipment to restore the pH value in the device to be neutral, starting normal sewage feeding operation, and replacing supernatant in the device;

(4) because the water inlet body in the device contains microorganisms or can be inoculated by the microorganisms, the microorganisms are loaded in the micropores of the diatomite, and finally, a biological film is formed on the surfaces of the diatomite molecules through proliferation and amplification to generate biological diatomite particles. Under the condition of not inoculating sludge, the required microorganism culture time is longer, generally 15 days are required, and the microorganism MLSS in the device can reach 7000mg/L at the moment, so that the device has a certain effect of removing sewage;

(5) biological powder particles are subjected to biochemical reaction and are finally precipitated in a precipitation section, sludge at the bottom is removed, and after the diatomite and the microorganisms are centrifugally separated by a separator, the lower-layer diatomite stock solution reflux device is recycled.

Example 3

To adopt the activated carbon as a powder carrier for loading microorganisms, the device process is 'SBR process + powder enhanced biochemical water treatment', and the total effective volume in the structure is measured to be 500m³Adding the powder carrier according to the adding concentration of 4g/L, and comprising the following steps:

(1) 2000kg of active carbon is required to be added, 120kg of active carbon is obtained by screening with a 250-mesh screen, and the active carbon is soaked in clear water for more than 12 hours until the active carbon completely absorbs moisture;

(2) adding activated carbon directly into the mixture with an effective volume of 500m³In the structure, the stirrer and the aeration equipment are started to uniformly distribute the active carbon into the cylindrical equipment, and the active carbon can be put in a plurality of points due to large adding amount, so that the active carbon is uniformly distributed. The concentration of dissolved oxygen is generally controlled to be 2mg/L and the time lasts for 4 hours;

(3) the active carbon can not cause the drastic change of the pH value of the water body after being dissolved in water, so the slurry can be directly added without adjusting the pH value of the water;

(4) carrying out internal pore diameter and external surface film formation on the activated carbon by using original microorganisms in a structure to finally form powder-loaded biological flocs, consuming pollutants by using the flocs, and reducing TN concentration from 20mg/L to 6 mg/L;

(5) the biological flocs carried by the powder are subjected to biochemical reaction and finally precipitated in a precipitation section, and the active carbon components in the removed sludge are recovered through the physical action of a separator or high-temperature calcination to recover the pore diameter of the active carbon for recycling, but the active carbon has more functional groups and is not similar to a common inorganic diatomite carrier, so the recovery cost is higher.

Example 4

To use fly ash as a powder carrier for microorganism loading, the device process is 'SBR process + powder enhanced biochemical water treatment', and the total effective volume in the device is measured to be 1000m³Adding the powder carrier according to the adding concentration of 3g/L, and comprising the following steps:

(1) 3000kg of fly ash is required to be added in the calculation, 3000kg of fly ash is obtained by using a 300-mesh sieve, and the fly ash is soaked for more than 24 hours so as to completely absorb moisture;

(2) as the coal ash is dissolved in water to cause the water body to be alkaline, the coal ash can not be directly added, and the coal ash is prepared into slurry, and added after the pH value is adjusted. Dissolving fly ash in water, and adding a certain amount of acid substances to restore the slurry of the fly ash to be neutral;

(3) adding the slurry of fly ash directly into the slurry with the effective volume of 1000m³In the original SBR structure, a stirrer and an aeration device are started to uniformly distribute the fly ash, and the addition amount is large, so that the fly ash can be uniformly distributedThe powder coal ash slurry is put in the SBR equipment at multiple points, so that the powder coal ash slurry is uniformly distributed;

(4) combining the fly ash with microorganisms in the biological oxidation ditch to enable the microorganisms to carry out biofilm proliferation on the fly ash to form powder-carried biological floccules, finally forming the powder-carried biological floccules, consuming pollutants by utilizing the floccules, and reducing the TN concentration from 20mg/L to 8 mg/L;

(5) biological powder particles wrapping the fly ash undergo biochemical reaction, are finally precipitated in a precipitation section, and remove bottom sludge from the fly ash, and the fly ash has lower density than inorganic diatomite and is generally difficult to separate out through centrifugation without considering recycling.

The foregoing description and description of the embodiments are provided to facilitate understanding and application of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications can be made to these teachings and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above description and the description of the embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. A method for biochemical treatment of sewage by a powder reinforced SBR method is characterized by comprising the following steps: selecting a proper powder carrier, removing impurities with a coarse particle size, adding water or wastewater to prepare the powder carrier into slurry, so that the powder carrier completely absorbs moisture and does not cake and float upwards; adjusting the pH value of the soaked powder slurry to be proper; the powder slurry after soaking and moisture absorption is completely added into a bioreactor or a biological reaction structure, so that the added powder carrier is uniformly distributed in the bioreactor; microorganisms in the bioreactor wrap the surface of the powder carrier through adhesion to form biological floccules with a core, finally, microbial powder particles pass through a biological reaction zone and are finally precipitated in a precipitation section, and the powder carrier and the microorganisms are separated and recycled in discharged sludge, so that the cyclic utilization of the powder carrier is realized.

2. The method for biochemical treatment of sewage by powder reinforced SBR process according to claim 1, which comprises the following steps:

s1, soaking the powder carrier which is determined in mass and sieved completely to absorb moisture to obtain slurry;

s6, biochemically degrading pollutants by the biological flocs in a biological reaction section; and discharging the powder carrier concentrated by gravity settling and the microorganism-loaded part of the powder carrier out of the reactor in the settling period, and repeatedly adding the treated powder for use.

3. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 2, wherein: in step S1, the powder carrier may be selected from: one or more of diatomite, powdered activated carbon, talcum powder and fly ash.

4. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 1, wherein: the particle size of the powder carrier particles is 10-200 mu m.

5. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 2, wherein: the screen mesh for sieving is a screen mesh with more than 250 meshes.

6. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 2, wherein: in the step S1, the soaking may be performed by using sewage, reaction effluent or tap water, or the powder is directly added into a bioreactor containing sewage, reaction effluent or tap water to soak and absorb moisture.

7. The method for biochemical treatment of sewage generated by SBR process with powder reinforcement as claimed in claim 2, wherein the operation sequence of steps S1, S2 and S3 can be changed as follows: directly adding the powder into a reactor, and soaking by using sewage in the device, namely operating according to the sequence of steps S2-S3-S1; or after the slurry or the powder is added into the reactor, the pH value in the reactor is adjusted, namely the operation is carried out according to the sequence of the steps S1-S3-S2 or S3-S1-S2.

8. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 2, wherein: adjusting the pH value to 7-8.

9. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 2, wherein: the slurry feeding mode of the step S3 is to adopt a directional spraying device to feed the slurry into a biochemical tank after the slurry is stirred by a stirring barrel; or after the stirring and wetting of the stirring barrel, the biochemical pool is positioned and added in a timed mode by a dry adding machine.

10. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 2, wherein: in step S3, the concentration of the powder carrier in the added structure is between 6g/L and 20 g/L.

11. The method for biochemical treatment of sewage by powder reinforced SBR process as claimed in claim 2, wherein the step S4 is performed by mixing a plurality of different hydraulic actions, including: the slurry and the inlet water are mixed by adopting a pipeline with a folded edge inside and a water driving force, or the slurry and the inlet water are mixed by stirring power and bubble rising disturbing power by utilizing a stirring and aerating device inside the reactor.

12. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 2, wherein: the microorganism in the step S5 is the original microorganism in the reactor, or the microorganism carried by the inlet water itself or the artificially added microbial inoculum.

13. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 2, wherein: the microorganism of the step S5 contacts with the powder carrier through sewage to form biological floccule; or after the environmental soil is washed, the leacheate containing the microorganisms is mixed with the powder to form biological floccules with good settling property.

14. The method for biochemical treatment of sewage by powder reinforced SBR process as claimed in claim 2, wherein the operation sequence of steps S3 and S5 can be changed as follows: adding a powder carrier into the reactor to granulate the biological flocs, namely operating according to the sequence of the steps S3-S5; or adding mature powder carrier floc inoculated with the microbial inoculum, namely operating according to the sequence of the steps S5-S3.

15. The method for biochemical treatment of sewage by using powder reinforced SBR (sequencing batch reactor) method according to claim 2, which is characterized in that: the powder floc is precipitated in a precipitation section to be natural gravity precipitation in the step S6; and mud scraping equipment is additionally arranged on the wall and the bottom of the reactor and is used for scraping wall-bound floccules and stirring bottom settled mud to prevent the formation of dead mud hardening.

16. The method for biochemical treatment of sewage by using powder reinforced SBR (sequencing batch reactor) method according to claim 2, which is characterized in that: and the step S6 separator separates and recycles the discharged powder through physical and chemical actions, and applies acting force with lower degree of destroying the powder structure.

17. The method for biochemical treatment of powder-reinforced SBR sewage according to claim 16, wherein: the acting force which is low in the degree of destroying the powder structure comprises centrifugation, gravity or combustion.