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Method for rapidly controlling sludge expansion and keeping long-term stability by forming sludge aggregates

A rapid control and sludge bulking technology, applied in water/sludge/sewage treatment, water treatment parameter control, chemical instruments and methods, etc., can solve problems that have not been reported, and achieve simple and convenient operation and long-term normal operation , the effect is fast and obvious

Active Publication Date: 2018-12-07
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no report on related research and patents on rapid control of sludge bulking and long-term stability by forming sludge aggregates

Method used

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  • Method for rapidly controlling sludge expansion and keeping long-term stability by forming sludge aggregates

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Embodiment 1

[0028] A method for rapidly controlling sludge bulking and long-term stability by forming sludge aggregates, comprising the following steps:

[0029] (1) Take 1L of bulky sludge concentrated by gravity to a sludge concentration of 1g / L, and the SVI of the sludge 30 is 300mL / g;

[0030] (2) adding 0.05g of chitosan with a dry sludge mass of 5% to the sludge in step (1);

[0031] (3) Using a mechanical mixer with a rotating speed of 50rpm, the sludge and chitosan were stirred evenly, then 10ml of glacial acetic acid (the concentration of acetic acid was 1%) was added, and the stirring was continued for 2min at 50rpm;

[0032] (4) drip the NaOH solution of 4mol / L after step (3), adjust pH to 10;

[0033] (5) Stop stirring after step (4), pour out the supernatant after precipitation for 30 minutes, and wash and soak the sludge aggregates with tap water for 3 times, each soaking time is 2h, and the collected sludge aggregates are returned to the reactor after SVI 5 125mL / g, SVI ...

Embodiment 2

[0035] A method for rapidly controlling sludge bulking and long-term stability by forming sludge aggregates, comprising the following steps:

[0036] (1) Take 1L of bulky sludge concentrated by gravity to a sludge concentration of 3g / L, and the SVI of the sludge 30 is 250mL / g;

[0037] (2) adding 0.3 g of chitosan with 10% dry sludge mass to the sludge in step (1);

[0038] (3) Using a mechanical mixer with a rotating speed of 300rpm, the sludge and chitosan were stirred evenly, then 15ml of glacial acetic acid (the concentration of acetic acid was 1.5%) was added, and the stirring was continued at 300rpm for 2min;

[0039] (4) drip the NaOH solution of 3mol / L after step (3), adjust pH to 8;

[0040] (5) Stop stirring after step (4), pour out the supernatant after precipitation for 15 minutes, and wash and soak the sludge aggregates with tap water for 3 times, each soaking time is 1.5h, the collected sludge aggregates are returned to the reactor after SVI 5 105mL / g, SVI 30...

Embodiment 3

[0042] A method for rapidly controlling sludge bulking and long-term stability by forming sludge aggregates, comprising the following steps:

[0043] (1) Take 1 L of bulk sludge that is centrifuged and concentrated to a sludge concentration of 6 g / L, and the SVI of the sludge is 30 is 400mL / g;

[0044] (2) adding 1.2 g of chitosan with a dry sludge mass of 20% to the sludge in step (1);

[0045] (3) Using a mechanical mixer with a rotating speed of 600rpm, the sludge and chitosan were stirred evenly, then 20ml of glacial acetic acid (the concentration of acetic acid was 2%) was added, and the stirring was continued at 600rpm for 2min;

[0046] (4) drip the NaOH solution of 5mol / L after step (3), adjust pH to 9;

[0047] (5) Stop stirring after step (4), pour out the supernatant after precipitation for 25 minutes, and wash and soak the sludge aggregates with tap water for 3 times, each soaking time is 2.5h, the collected sludge aggregates are returned to the reactor after SVI...

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Abstract

The invention belongs to the field of biological treatment on wastewater and relates to a method for rapidly controlling sludge expansion and keeping long-term stability by forming sludge aggregates.The method comprises: (1) taking expanded sludge and concentrating the expanded sludge (by gravity concentration or centrifuging concentration), (2) adding a cationic high molecular polymer which is insoluble in water into the sludge, (3) carrying out uniform stirring and adding glacial acetic acid into the mixture, (4) adding an alkali liquor into the mixed solution to adjust pH of the mixed solution to greater than 7, and (5) cleaning and immersing the formed sludge aggregate, collecting and returning the sludge aggregate into a reactor and carrying out normal operation so that the sludge expansion can be fast controlled and the stability is kept for a long time. The method is easy to operate, produces fast and obviously effect and is easy to implement.

Description

technical field [0001] The invention belongs to the field of biological wastewater treatment, and in particular relates to a method for rapidly controlling sludge bulking and long-term stability by forming sludge aggregates. Background technique [0002] Activated sludge method is the most widely used sewage treatment technology in urban sewage treatment plants, and has the advantages of economy and good treatment effect. Activated sludge is mainly composed of microorganisms that can adsorb and degrade organic matter and pollutants such as nitrogen and phosphorus. During the daily operation of the sewage treatment plant, due to the changes of dissolved oxygen and organic load, the sewage treatment plant is faced with the problem of sludge bulking. [0003] At present, there have been a lot of researches on sludge bulking and corresponding solutions have been established, but the published patents are mainly on the dosing and biological selector methods. Dosing can achieve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/12C02F3/28
CPCC02F3/12C02F3/28C02F3/34C02F2103/001C02F2209/105Y02W10/10
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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