CN108675440B - Method for promoting quick formation of aerobic granular sludge through sludge aggregate preparation - Google Patents

Method for promoting quick formation of aerobic granular sludge through sludge aggregate preparation Download PDF

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CN108675440B
CN108675440B CN201810616900.7A CN201810616900A CN108675440B CN 108675440 B CN108675440 B CN 108675440B CN 201810616900 A CN201810616900 A CN 201810616900A CN 108675440 B CN108675440 B CN 108675440B
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CN108675440A (en
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邹金特
潘继杨
何航天
李军
倪永炯
吴淑云
何东芹
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Zhejiang University of Technology ZJUT
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1263—Sequencing batch reactors [SBR]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

The invention belongs to the field of biological treatment of wastewater, and relates to a method for promoting quick formation of aerobic granular sludge by sludge aggregate preparation. The method comprises the following steps: (1) taking and concentrating common activated sludge; (2) adding a water-insoluble cationic high molecular polymer; (3) adding glacial acetic acid after uniformly stirring; (4) adding alkali liquor to adjust the pH value of the mixed solution to be alkaline; (5) cleaning and soaking the formed sludge aggregate, collecting and inoculating the sludge aggregate into a Sequencing Batch Reactor (SBR) for operation; (6) the SBR can realize complete granulation after 3-10 days of operation, and the aerobic granular sludge can still keep stable structure after long-term operation. The invention can promote the rapid formation of aerobic granular sludge, has simple and efficient operation and is easy for practical application.

Description

Method for promoting quick formation of aerobic granular sludge through sludge aggregate preparation
Technical Field
The invention belongs to the field of biological wastewater treatment, and particularly relates to a method for promoting quick formation of aerobic granular sludge through sludge aggregate preparation.
Background
Compared with the traditional activated sludge method, the aerobic granular sludge is a novel sewage biological treatment technology which is newly appeared in recent years, and has the advantages of compact structure, good settling property, high biomass, synchronous nitrogen and phosphorus removal function, impact load resistance, toxic and harmful substance resistance, small occupied area and the like. However, the development of the technology is still restricted by the problems of long start-up time of an aerobic granular sludge system and the like. Developed in Dutch Delfti industry in general
Figure BDA0001696509670000011
The technology needs 3-5 months of acclimatization and culture to realize aerobic sludge granulation in practical engineering application. A publication (Aerobic slurry granulation in a full-scale sequencing batch reactor) published by Lijun et al reports that Aerobic sludge granulation is achieved by 337-day culture in a Sequencing Batch Reactor (SBR) of a real scale. At present, related researches for promoting the rapid formation of aerobic granular sludge have been applied for patents, but the published patents all promote the rapid formation of the aerobic granular sludge by changing the operation parameters and the structure of a reactor or adding substances during the operation of the reactor, the sedimentation performance of the sludge at the initial stage of operation is poor, and the complete granulation basically needs about 2-4 weeks. The patent does not relate to the characteristic indexes of preparing the aerobic granular sludge, such as grain diameter, sedimentation index and the like, nor does the patent mention the operation condition of the prepared granules in a reactor, and simultaneously, the amidino cationic polymer chemical agent is difficult to prepare and has higher cost.
A method capable of rapidly promoting the formation of aerobic granular sludge aggregates is found, so that the reactor can obtain good sedimentation performance at the initial starting operation stage, and meanwhile, an aerobic granular sludge system can stably operate for a long time in the operation process, and the method has important significance for the application and development of an aerobic granular sludge technology. The cationic polymeric flocculant has strong flocculation effect on the activated floc sludge, can promote the formation of sludge aggregates, but has certain inhibition effect on the sludge activity. Therefore, a more suitable cationic polymeric flocculant is found to promote the formation of sludge aggregates with high strength and high stability, so that the aerobic granular sludge system has good settling property at the initial start-up stage and can stably run for a long time, and the method has very important practical significance and economic value for the application of the aerobic granular sludge technology in the field of wastewater treatment.
Disclosure of Invention
The invention aims to solve the defects that the sludge sedimentation performance is poor in the initial operation stage, the complete granulation time is long (about 2-8 weeks), and a conventional cationic high-molecular flocculant (such as polyacrylamide) has a certain inhibition effect on the sludge activity and can run off along with effluent in the prior art, and provides a method for promoting the rapid formation of aerobic granular sludge by preparing sludge aggregates from a water-insoluble cationic high-molecular polymer.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for promoting rapid formation of aerobic granular sludge through sludge aggregate preparation, the method comprising the steps of:
(1) 1L of common activated sludge is taken for gravity concentration;
(2) adding a water-insoluble cationic high molecular polymer into the common activated sludge concentrated in the step (1);
(3) after stirring uniformly, adding glacial acetic acid, and continuously stirring to obtain a mixed solution;
(4) adding alkali liquor into the mixed liquor obtained in the step (3), adjusting the pH value of the mixed liquor to be alkaline, and precipitating to obtain sludge aggregates;
(5) cleaning and soaking the sludge aggregate formed in the step (4) with tap water, collecting and inoculating the sludge aggregate into SBR, and then operating in a water inlet, reaction, precipitation, water outlet and idle mode;
(6) the SBR runs for 3-10 days, the sludge in the reactor mainly comprises aerobic granular sludge, the granular performance is good, and the aerobic granular sludge can still keep stable structure after long-term running.
In the step (1), the common activated sludge is floc activated sludge cultured conventionally in a laboratory, and the concentration of the sludge after gravity concentration is 2-20 g/L;
in the step (2), the adding amount of the chitosan is preferably 2-50% (based on the mass of the dry sludge, w/w).
In the step (3), mechanical stirring is adopted, the stirring speed is 100-1000rpm, the amount of the glacial acetic acid added is 0.2-5%, and the stirring is continued for 1-2 min.
In the step (4), the added alkali liquor is NaOH, the concentration is 2-6mol/L, and the pH of the mixed liquor is adjusted to 7.5-11.
In the step (5), the sludge aggregate is washed by tap water for 2-3 times, and the soaking time is 0.5-2.5h each time; the collected sludge aggregate has an average particle diameter of 0.5-2.5mm, and Sludge Volume Index (SVI) of 5min and 30min5And SVI30) 60-90 mL/g; the reaction stage in the SBR operation is carried out with anaerobic stirring and aerobic aeration operation or only aerobic aeration operation.
In the step (6), after running for 3-10 days, the aerobic granular sludge has a compact structure, the average grain diameter of the sludge is 0.5-2.0mm, and SVI5And SVI3040-70mL/g, and the aerobic granular sludge in the reactor accounts for more than 75 percent; the long-term operation is 60-100 days.
The technical conception of the invention is as follows: the aerobic granular sludge has the advantages of compact structure, good settling property, high biomass, synchronous nitrogen and phosphorus removal, impact load resistance, toxic and harmful substance resistance and the like, and has wide application prospect in the field of biological wastewater treatment. However, the development of the technology is still restricted by the problems of long start-up time of an aerobic granular sludge system and the like.
Chitosan is a natural high molecular polysaccharide and has no inhibitory effect on microbial activity. Meanwhile, the chitosan contains amino and is a natural cationic flocculant.
Chitosan is added and dissolved by acetic acid, so that the chitosan can be used as an adhesive and a framework to promote the sludge of the active floc to quickly form sludge aggregates. After the pH value is adjusted to be alkaline, the dissolved chitosan can be separated out in water and adhered to the sludge aggregate, so that the added chitosan cannot run off along with the water during normal operation, and the stability and good settleability of the sludge aggregate are ensured.
Because the sludge aggregate has good sedimentation performance, aerobic granular sludge with compact structure and better sedimentation performance can be quickly formed by culturing in SBR.
The beneficial effects of the invention are mainly embodied as follows:
(1) the chitosan has rich content in nature, simple preparation and low price, is a natural cationic polymeric flocculant and has no inhibition effect on the activity of microorganisms in sludge.
(2) The preparation of the sludge aggregate greatly shortens the formation time of aerobic granular sludge, and simultaneously can obtain good sludge sedimentation performance at the initial stage of the starting stage of the reactor, thereby being beneficial to the stable operation of an aerobic granular sludge system.
(3) When the aerobic granular sludge system is broken, floc sludge discharged along with effluent can be quickly formed into sludge aggregates by the method provided by the invention, and then the sludge aggregates are put into the granular sludge reactor again for operation, so that the long-term stable operation of the aerobic granular sludge is ensured.
(4) The preparation of the sludge aggregate is simple to operate and easy to be applied practically.
Drawings
FIG. 1 is a topographical view of the prepared sludge aggregates.
FIG. 2 is a graph of aerobic granular sludge morphology after 6 days of operation.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
A method for promoting the rapid formation of aerobic granular sludge by sludge aggregate preparation comprises the following steps:
(1) 1L of common activated sludge cultured in a laboratory is taken and put in a beaker, and the sludge concentration is 2 g/L;
(2) adding 0.04g of chitosan accounting for 2 percent of the mass of the dry sludge into the sludge in the step (1);
(3) uniformly stirring the sludge and the chitosan by adopting a mechanical stirrer at the rotating speed of 100rpm, and then adding 2mL of glacial acetic acid (the concentration of the mixed solution is 0.2%), and stirring for 2min at the rotating speed of 100 rpm;
(4) dropwise adding 3mol/L NaOH solution after the step (3), and adjusting the pH value to 7.5;
(5) stopping stirring after the step (4), precipitating for 10min, pouring out supernatant, and cleaning and soaking sludge aggregate with tap water for 3 times, each time for 0.5h to obtain SVI with sludge average particle size of 0.55mm5Is 85mL/g, SVI30Is 80 mL/g;
(6) inoculating the sludge aggregate collected in the step (5) into an SBR reactor, and operating according to the modes of water inlet, anaerobic stirring, aerobic aeration, sedimentation, water outlet and idling, wherein the water filling ratio of the SBR is 50%, and the operation period is 6 h: feeding water for 10min, anaerobic stirring for 90min, aerating for 180min, precipitating for 3-5min, discharging water for 10min, and standing for 65-67 min;
(7) after 3 days of operation, compact aerobic granular sludge is formed in SBR, the average grain diameter of the sludge is 0.55mm, and SVI5Is 70mL/g, SVI30Is 65mL/g, SVI30/SVI50.93 percent, the aerobic granular sludge in the reactor accounts for more than 75 percent, and the aerobic granular sludge in the SBR can still keep stable structure after running for 60 days.
Example 2
A method for promoting the rapid formation of aerobic granular sludge by sludge aggregate preparation comprises the following steps:
(1) 1L of common activated sludge cultured in a laboratory is taken and put in a beaker, and the sludge concentration is 4 g/L;
(2) 0.4g of chitosan accounting for 10 percent of the mass of the dry sludge is added into the sludge in the step (1);
(3) uniformly stirring the sludge and the chitosan by adopting a mechanical stirrer at the rotating speed of 200rpm, and then adding 5mL of glacial acetic acid (the concentration of the mixed solution is 0.5%), and stirring for 2min at 200 rpm;
(4) dropwise adding 6mol/L NaOH solution after the step (3), and adjusting the pH value to 9;
(5) stopping stirring after the step (4), precipitating for 10min, pouring out supernatant, and cleaning and soaking sludge aggregate with tap water for 3 times, each time for 0.5h to obtain SVI with sludge average particle size of 0.93mm5Is 70mL/g, SVI3068 mL/g;
(6) inoculating the sludge aggregate collected in the step (5) into an SBR reactor, and operating in a mode of water inlet, aerobic aeration, sedimentation, water outlet and idling, wherein the water filling ratio of the SBR is 50%, and the operation period is 4 h: feeding water for 10min, aerobic aerating for 180min, precipitating for 3-5min, discharging water for 10min, and standing for 35-37 min;
(7) after running for 5 days, compact aerobic granular sludge is formed in SBR, the average grain diameter of the sludge is 0.85mm, and SVI560mL/g, SVI30Is 55mL/g, SVI30/SVI50.92, aerobic granules in the reactorThe granular sludge accounts for more than 85 percent, and the aerobic granular sludge in the SBR can still keep stable structure after 75 days of operation.
Example 3
A method for promoting the rapid formation of aerobic granular sludge by sludge aggregate preparation comprises the following steps:
(1) 1L of common activated sludge cultured in a laboratory is taken and put in a beaker to be concentrated until the sludge concentration is 7 g/L;
(2) adding 1.4g of chitosan accounting for 20 percent of the mass of the dry sludge into the sludge in the step (1);
(3) uniformly stirring the sludge and the chitosan by adopting a mechanical stirrer at the rotating speed of 300rpm, and then adding 5mL of glacial acetic acid (the concentration of the mixed solution is 0.5%) and stirring at 300rpm for 1 min;
(4) dropwise adding 5mol/L NaOH solution after the step (3), and adjusting the pH value to 10;
(5) stopping stirring after the step (4), precipitating for 10min, pouring out supernatant, and cleaning and soaking sludge aggregate with tap water for 2 times (each time for 2 h) to obtain sludge with average particle diameter of 1.3mm and SVI560mL/g, SVI30Is 60 mL/g;
(6) inoculating the sludge aggregate collected in the step (5) into an SBR reactor, and operating according to the modes of water inlet, anaerobic stirring, aerobic aeration, sedimentation, water outlet and idling, wherein the water filling ratio of the SBR is 50%, and the operation period is 6 h: feeding water for 10min, anaerobic stirring for 90min, aerobic aeration for 180min, precipitating for 3-5min, discharging water for 10min, and standing for 65-67 min;
(7) after 5 days of operation, compact aerobic granular sludge is formed in SBR, the average grain diameter of the sludge is 1.2mm, and SVI5Is 55mL/g, SVI30Is 50mL/g, SVI30/SVI50.91, the aerobic granular sludge in the reactor accounts for more than 90 percent, and the aerobic granular sludge in the SBR can still keep stable structure after running for 60 days.
Example 4
A method for promoting the rapid formation of aerobic granular sludge by sludge aggregate preparation comprises the following steps:
(1) 1L of common activated sludge cultured in a laboratory is taken and put in a beaker to be concentrated until the sludge concentration is 6 g/L;
(2) adding 0.3g of chitosan accounting for 5 percent of the mass of the dry sludge into the sludge in the step (1);
(3) uniformly stirring the sludge and the chitosan by adopting a mechanical stirrer at the rotating speed of 200rpm, and then adding 15mL of glacial acetic acid (the concentration of the mixed solution is 1.5%) and stirring for 2min at 200 rpm;
(4) dropwise adding 4mol/L NaOH solution after the step (3), and adjusting the pH value to 9;
(5) stopping stirring after the step (4), precipitating for 10min, pouring out supernatant, and cleaning and soaking sludge aggregate with tap water for 3 times, each time for 1.5h to obtain SVI with sludge average particle size of 0.9mm5Is 70mL/g, SVI3068 mL/g;
(6) inoculating the sludge aggregate collected in the step (5) into an SBR reactor, and operating in a mode of water inlet, aerobic aeration, sedimentation, water outlet and idling, wherein the water filling ratio of the SBR is 50%, and the operation period is 4 h: feeding water for 10min, aerobic aerating for 180min, precipitating for 3-5min, discharging water for 10min, and standing for 35-37 min;
(7) after 7 days of operation, compact aerobic granular sludge is formed in SBR, the average grain diameter of the sludge is 0.8mm, and SVI560mL/g, SVI30Is 55mL/g, SVI30/SVI50.92, the aerobic granular sludge in the reactor accounts for more than 75 percent, and the aerobic granular sludge in the SBR can still keep stable structure after running for 70 days.
Example 5
A method for promoting the rapid formation of aerobic granular sludge by sludge aggregate preparation comprises the following steps:
(1) 1L of common activated sludge cultured in a laboratory is taken and put in a beaker to be concentrated until the sludge concentration is 8 g/L;
(2) 2g of chitosan accounting for 25 percent of the mass of the dry sludge is added into the sludge in the step (1);
(3) uniformly stirring the sludge and the chitosan by adopting a mechanical stirrer at the rotating speed of 600rpm, then adding 10mL of glacial acetic acid (the concentration of the mixed solution is 1%), and stirring for 1min at the rotating speed of 600 rpm;
(4) dropwise adding 6mol/L NaOH solution after the step (3), and adjusting the pH value to 11;
(5) stopping stirring after the step (4), precipitating for 10min, and pouring out the supernatantAnd cleaning and soaking the sludge aggregate for 3 times with tap water, each time for 2h to obtain SVI with sludge average particle size of 1.2mm560mL/g, SVI30Is 60 mL/g;
(6) inoculating the sludge aggregate collected in the step (5) into an SBR reactor, and operating according to the modes of water inlet, anaerobic stirring, aerobic aeration, sedimentation, water outlet and idling, wherein the water filling ratio of the SBR is 50%, and the operation period is 6 h: feeding water for 10min, anaerobic stirring for 120min, aerobic aeration for 180min, precipitating for 3-5min, discharging water for 10min, and standing for 35-37 min;
(7) after 10 days of operation, compact aerobic granular sludge is formed in SBR, the average grain diameter of the sludge is 1.1mm, and SVI5Is 50mL/g, SVI30Is 48mL/g, SVI30/SVI50.96 percent, the aerobic granular sludge in the reactor accounts for more than 90 percent, and the aerobic granular sludge in the SBR can still keep stable structure after the operation for 90 days.
Example 6
A method for promoting the rapid formation of aerobic granular sludge by sludge aggregate preparation comprises the following steps:
(1) 1L of common activated sludge cultured in a laboratory is taken and put in a beaker to be concentrated until the sludge concentration is 10 g/L;
(2) 5g of chitosan accounting for 50% of the mass of the dry sludge is added into the sludge in the step (1);
(3) uniformly stirring the sludge and the chitosan by adopting a mechanical stirrer at the rotating speed of 1000rpm, then adding 40mL of glacial acetic acid (the concentration of the mixed solution is 4%), and stirring for 1min at 1000 rpm;
(4) dropwise adding 5mol/L NaOH solution after the step (3), and adjusting the pH value to 11;
(5) stopping stirring after the step (4), precipitating for 10min, pouring out supernatant, and cleaning and soaking sludge aggregate with tap water for 3 times, each time for 2.5h to obtain SVI with sludge average particle size of 2.2mm5Is 65mL/g, SVI3065 mL/g;
(6) inoculating the sludge aggregate collected in the step (5) into an SBR reactor, and operating in a mode of water inlet, aerobic aeration, sedimentation, water outlet and idling, wherein the water filling ratio of the SBR is 50%, and the operation period is 4 h: feeding water for 10min, aerobic aerating for 180min, precipitating for 3-5min, discharging water for 10min, and standing for 35-37 min;
(7) after 8 days of operation, compact aerobic granular sludge is formed in SBR, the average grain diameter of the sludge is 1.8mm, and SVI5Is 55mL/g, SVI30Is 50mL/g, SVI30/SVI50.91, the aerobic granular sludge in the reactor accounts for more than 80 percent, and the aerobic granular sludge in the SBR can still keep stable structure after 80 days of operation.
Example 7
A method for promoting the rapid formation of aerobic granular sludge by sludge aggregate preparation comprises the following steps:
(1) 1L of common activated sludge cultured in a laboratory is taken and put in a beaker to be concentrated until the sludge concentration is 20 g/L;
(2) 5g of chitosan accounting for 25 percent of the mass of the dry sludge is added into the sludge in the step (1);
(3) uniformly stirring the sludge and the chitosan by adopting a mechanical stirrer at the rotating speed of 800rpm, then adding 50mL of glacial acetic acid (the concentration of the mixed solution is 5%), and stirring for 1min at 800 rpm;
(4) dropwise adding 3mol/L NaOH solution after the step (3), and adjusting the pH value to 8;
(5) stopping stirring after the step (4), precipitating for 10min, pouring out supernatant, and cleaning and soaking sludge aggregate with tap water for 3 times, each time for 1.5h to obtain SVI with sludge average particle size of 2.5mm5Is 75mL/g, SVI30Is 70 mL/g;
(6) inoculating the sludge aggregate collected in the step (5) into an SBR reactor, and operating according to the modes of water inlet, anaerobic stirring, aerobic aeration, sedimentation, water outlet and idling, wherein the water filling ratio of the SBR is 50%, and the operation period is 6 h: feeding water for 10min, anaerobic stirring for 90min, aerobic aeration for 180min, precipitating for 3-5min, discharging water for 10min, and standing for 65-67 min;
(7) after 7 days of operation, compact aerobic granular sludge is formed in SBR, the average grain diameter of the sludge is 2.0mm, and SVI5Is 58mL/g, SVI30Is 55mL/g, SVI30/SVI50.95 percent, more than 85 percent of aerobic granular sludge in the reactor, and the aerobic granular sludge in the SBR can still keep stable structure after 100 days of operation.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Accordingly, the present invention is not limited to the embodiments herein, and the scope of the present invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. A method for promoting the rapid formation of aerobic granular sludge by sludge aggregate preparation is characterized in that: the method comprises the following steps:
(1) 1L of common activated sludge is taken for gravity concentration;
(2) adding a water-insoluble cationic high molecular polymer into the common activated sludge concentrated in the step (1), wherein the water-insoluble cationic high molecular polymer is chitosan, and the adding amount is 2-50% of the mass of the dry sludge;
(3) after stirring uniformly, adding glacial acetic acid, and continuously stirring to obtain a mixed solution;
(4) adding alkali liquor into the mixed liquor obtained in the step (3), adjusting the pH value of the mixed liquor to be alkaline, and precipitating to obtain sludge aggregates;
(5) cleaning and soaking the sludge aggregate formed in the step (4) with tap water, collecting and inoculating the sludge aggregate into SBR, and then operating in a water inlet, reaction, precipitation, water outlet and idle mode;
(6) SBR runs for 3-10 days.
2. The method for promoting the rapid formation of aerobic granular sludge prepared by sludge aggregation as claimed in claim 1, wherein: in the step (1), the concentration of the concentrated common activated sludge is 2-20 g/L.
3. The method for promoting the rapid formation of aerobic granular sludge prepared by sludge aggregation as claimed in claim 1, wherein: in the step (3), mechanical stirring is adopted, the stirring speed is 100-1000rpm, the amount of the glacial acetic acid added is 0.2-5%, and the stirring is continued for 1-2 min.
4. The method for promoting the rapid formation of aerobic granular sludge prepared by sludge aggregation as claimed in claim 1, wherein: and (4) adding alkali liquor to adjust the pH of the mixed liquor to 7.5-11.
5. The method for promoting the rapid formation of aerobic granular sludge prepared by sludge aggregation as claimed in claim 1, wherein: in the step (5), the sludge aggregate is washed by tap water for 2-3 times, and the soaking time is 0.5-2.5h each time; the average particle diameter of the collected sludge aggregates is 0.5-2.5mm, and the sludge volume index SVI of 5min of static sedimentation560-90mL/g, sludge volume index SVI of 30min30Is 60-90 mL/g.
6. The method for promoting the rapid formation of aerobic granular sludge prepared by sludge aggregation as claimed in claim 1, wherein: in the step (6), after running for 3-10 days, the aerobic granular sludge has a compact structure, the average grain diameter of the sludge is 0.5-2.0mm, and SVI540-70mL/g, SVI3040-70mL/g, and the aerobic granular sludge in the reactor accounts for more than 75 percent.
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