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Method for promoting rapid formation of aerobic granular sludge through preparation of sludge aggregate

An aerobic granular sludge and aggregate technology, applied in water/sludge/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc. Long time and other problems, to achieve the effect of shortening time, conducive to stable operation and easy practical application

Active Publication Date: 2018-10-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor sludge settling performance at the initial stage of operation in the existing process, and it takes a long time to realize complete granulation (about 2-8 weeks). Conventional cationic polymer flocculants (such as polyacrylamide, etc.) Sludge activity has a certain inhibitory effect and will be lost with the effluent to provide a method for preparing sludge aggregates through water-insoluble cationic polymers to promote the rapid formation of aerobic granular sludge

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  • Method for promoting rapid formation of aerobic granular sludge through preparation of sludge aggregate
  • Method for promoting rapid formation of aerobic granular sludge through preparation of sludge aggregate

Examples

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Embodiment 1

[0032] A method for promoting the rapid formation of aerobic granular sludge by preparing sludge aggregates, including the following steps:

[0033] (1) Take 1L of ordinary activated sludge cultivated in the laboratory in a beaker, and the sludge concentration is 2g / L;

[0034] (2) Add 0.04 g of chitosan with 2% dry sludge mass to the sludge of step (1);

[0035] (3) Use a mechanical mixer at 100 rpm to stir the sludge and chitosan evenly, then add 2 mL of glacial acetic acid (the concentration of the mixture is 0.2%), and stir at 100 rpm for 2 minutes;

[0036] (4) After step (3), drop 3mol / L NaOH solution to adjust the pH to 7.5;

[0037] (5) Stop stirring after step (4), pour out the supernatant after 10 minutes of precipitation, and wash and soak the sludge aggregates 3 times with tap water for 0.5h each time to obtain an average sludge particle size of 0.55mm, SVI 5 85mL / g, SVI 30 80mL / g;

[0038] (6) Inoculate the sludge aggregates collected in step (5) into the SBR reactor, and op...

Embodiment 2

[0041] A method for promoting the rapid formation of aerobic granular sludge by preparing sludge aggregates, including the following steps:

[0042] (1) Take 1L of ordinary activated sludge cultured in the laboratory in a beaker, the sludge concentration is 4g / L;

[0043] (2) Add 0.4 g of chitosan with 10% dry sludge mass to the sludge in step (1);

[0044] (3) Use a mechanical mixer at 200 rpm to stir the sludge and chitosan evenly, then add 5 mL of glacial acetic acid (the concentration of the mixture is 0.5%), and stir at 200 rpm for 2 minutes;

[0045] (4) After step (3), add 6mol / L NaOH solution dropwise to adjust the pH to 9;

[0046] (5) Stop stirring after step (4), pour out the supernatant after 10 minutes of precipitation, and wash and soak the sludge aggregates 3 times with tap water for 0.5h each time to obtain an average sludge particle size of 0.93mm, SVI 5 70mL / g, SVI 30 68mL / g;

[0047] (6) Inoculate the sludge aggregates collected in step (5) into the SBR reactor, and op...

Embodiment 3

[0050] A method for promoting the rapid formation of aerobic granular sludge by preparing sludge aggregates, including the following steps:

[0051] (1) Take 1L of ordinary activated sludge cultivated in the laboratory in a beaker and concentrate it to a sludge concentration of 7g / L;

[0052] (2) Add 1.4 g of chitosan with 20% dry sludge mass to the sludge of step (1);

[0053] (3) Use a mechanical mixer at 300 rpm to stir the sludge and chitosan evenly, then add 5 mL of glacial acetic acid (the concentration of the mixture is 0.5%), and stir at 300 rpm for 1 min;

[0054] (4) After step (3), add 5mol / L NaOH solution dropwise to adjust the pH to 10;

[0055] (5) Stop stirring after step (4), pour out the supernatant after precipitation for 10 minutes, and wash and soak the sludge aggregates twice with tap water for 2 hours each time to obtain an average sludge particle size of 1.3 mm, SVI 5 60mL / g, SVI 30 60mL / g;

[0056] (6) Inoculate the sludge aggregates collected in step (5) into the...

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Abstract

The invention belongs to the field of biological treatment of wastewater, and relates to a method for promoting the rapid formation of aerobic granular sludge through preparation of a sludge aggregate. The method comprises the following steps of (1) taking common activated sludge, and concentrating; (2) adding a cationic macromolecular polymer which is insoluble in water; (3) after uniformly stirring, adding glacial acetic acid; (4) feeding alkali liquor, adjusting a pH value of the mixed liquor to be alkaline; (5) cleaning and soaking the formed sludge aggregate, collecting, and inoculating into a sequencing batch reactor (SBR) for running; (6) after running the SBR for 3 to 10 days, realizing complete granulation, wherein after long-time running, the aerobic granular sludge can still keep structure stability. The method provided by the invention can promote the rapid formation of the aerobic granular sludge, and is simple and high-efficient to operate, and easy for practical application.

Description

Technical field [0001] The invention belongs to the field of wastewater biological treatment, and specifically relates to a method for promoting the rapid formation of aerobic granular sludge through the preparation of sludge aggregates. Background technique [0002] Aerobic granular sludge is a new type of wastewater biological treatment technology that has emerged in recent years. Compared with the traditional activated sludge method, it has compact structure, good sedimentation performance, high biomass, simultaneous nitrogen and phosphorus removal, and impact resistance. The advantages of load, resistance to toxic and harmful substances and small footprint. However, the long start-up time of the aerobic granular sludge system still restricts the development of this technology. Developed by Delft University of Technology The technology needs 3-5 months of domestication and cultivation in actual engineering applications to achieve aerobic sludge granulation. The literature p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F9/14
CPCC02F1/56C02F1/66C02F3/12C02F3/1263C02F9/00Y02W10/10
Inventor 邹金特潘继杨何航天李军倪永炯吴淑云何东芹
Owner ZHEJIANG UNIV OF TECH
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