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Method for reducing excess sludge of aerobic unit of sewage treatment system by activated sludge process

A technology of sewage treatment system and activated sludge method, applied in water/sludge/sewage treatment, sludge treatment, biological sludge treatment, etc., can solve the problem of reduced sludge activity and achieve the effect of strong performance

Active Publication Date: 2011-08-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for reducing excess sludge in an aerobic unit of an activated sludge process sewage treatment system. The complex uncoupling agent with amide (TCS) as the main component can effectively solve the technical problem of sludge activity reduction caused by the addition of TCS to the sewage treatment system in the prior art

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  • Method for reducing excess sludge of aerobic unit of sewage treatment system by activated sludge process

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Experimental program
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Embodiment 1～8、 comparative example 1～2

[0029] The treated sewage is oil refinery sewage, which is treated by oil separation and coagulation flotation. The quality of the influent water is:

[0030] COD575mg / l

[0031] pH 8.2

[0032] Sequenced batch activated sludge process (SBR process) is used for treatment, and the reactor volume is 8m3. The process includes: water inflow-aerobic reaction-sedimentation-decanting water-anaerobic (reciprocating), the operation of aerobic reaction process The process conditions are:

[0033] Sludge load 0.4~0.9kgBOD 5 / (kgMLVSS·d)

[0034] Reaction temperature 20~30℃

[0035] Dissolved oxygen 2~4mg / l

[0036] The amount of uncoupling agent added in sewage is shown in Table 2

[0037] (calculated in TCS)

[0038] The composition of the uncoupling agent that embodiment 1~8, comparative example 1~2 adopts comprises TCS, all the other components and proportioning ratio are listed in table 1, and the specific surface area of ​​diatomite used is 30~60m 2 / g, the particle size of ...

Embodiment 9～16

[0040] The treated sewage is ethylene glycol production sewage, and the quality of the influent water is:

[0041]COD 2050mg / l

[0042] pH value 6~9

[0043] The AB activated sludge process is used for treatment, and the process includes in turn: water inflow-high-load aerobic treatment in section A-intermediate sedimentation tank-low-load aerobic treatment in section B-final sedimentation tank-drainage, intermediate sedimentation tank and final sedimentation tank Part of the sludge is returned to the respective aerobic tanks, and the remaining sludge is discharged. Embodiments 9 to 16 carry out sludge reduction treatment for the high-load aerobic unit of section A with high sludge yield (including high-load aerobic treatment and intermediate sedimentation tank of section A), and the operating process conditions are:

[0044] Sludge load 2~4kgBOD 5 / (kgMLVSS·d)

[0045] Reaction temperature 20~30℃

[0046] Dissolved oxygen 0.5~1mg / l

[0047] The amount of uncoupling agen...

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Abstract

The invention relates to a method for reducing excess sludge of an aerobic unit of a sewage treatment system by an activated sludge process, which comprises a step of adding a chemical uncoupling agent into water inlet of the aerobic unit of the sewage treatment system, wherein the chemical uncoupling agent comprises the following components: 3,3,4,5-tetrachloro salicylamide, soluble copper salt and an adsorbent; the soluble copper salt is one of copper sulfate, copper chloride or copper acetate; the adsorbent is one of refined diatomite or zeolite powder or a mixture of the refined diatomiteand the zeolite powder; the weight ratio of the 3,3,4,5-tetrachloro salicylamide to the soluble copper salt is 1:0.05-0.25; the weight ratio of the total of the 3,3,4,5-tetrachloro salicylamide and the soluble copper to the adsorbent is 1:0.05-1.00; and in the water inlet, the addition amount of the chemical uncoupling agent accounted by the 3,3,4,5-tetrachloro salicylamide is controlled in the range of 0.6 to 3.8mg / l. The method has stronger sludge reduction performance. If the same weight reduction rate of the sludge is achieved, the added TCS (tetrachloro salicylamide) can be reduced by 25to 75 percent, and the removing rate of the COD (chemical oxygen demand) is basically not influenced.

Description

technical field [0001] The invention relates to a method for reducing the yield of excess sludge in an aerobic unit of an activated sludge sewage treatment process. The residual sludge in the aerobic unit of the mud method sewage treatment system can be reduced. Background technique [0002] Activated sludge method is currently the most widely used sewage (including urban sewage or industrial sewage) biological treatment technology, although this process technology has many advantages, such as less investment in infrastructure, good treatment effect, stable operation, etc., but it also has a The obvious disadvantage is that a large amount of residual sludge will be generated during operation. The cost of excess sludge treatment is quite high, generally accounting for 25% to 65% of the total operating cost of the sewage plant. Therefore, reducing or reducing the generation rate of excess sludge in the activated sludge sewage treatment process has always been a subject of gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F3/12
CPCY02W10/10Y02W10/20
Inventor 仓一华吴敏赵海云马晓伟姜垒垒吴培云
Owner CHINA PETROLEUM & CHEM CORP
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