Regulation and control method for microbial activity in membrane bioreactor for micro-polluted surface water treatment

A membrane bioreactor, biological activity technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of low biomass, unstable effluent quality and poor biological activity and other problems to achieve the effect of ensuring stable operation and preventing the reduction of microbial activity

Inactive Publication Date: 2012-07-18
TONGJI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor biological activity, less biomass and unstable effluent quality in the membrane bioreactor due to the low concentration of organic matter in the raw water or the low temperature in the engineering application of the membrane bioreactor to treat micro-polluted surface water. Provide a method for regulating biological activity in a membrane bioreactor for micropolluted surface water treatment

Method used

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  • Regulation and control method for microbial activity in membrane bioreactor for micro-polluted surface water treatment
  • Regulation and control method for microbial activity in membrane bioreactor for micro-polluted surface water treatment
  • Regulation and control method for microbial activity in membrane bioreactor for micro-polluted surface water treatment

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Effect test

Embodiment 1

[0020] Membrane bioreactor influent COD Mn The concentration is 3.5~4.2mg / L, the ammonia nitrogen concentration is 0.5~1.3mg / L, and the hydraulic retention time is 1.5h. In the meantime, take 10%~20% (volume ratio) of the sludge mixture from the membrane bioreactor into the biological culture tank, and add a certain amount of nutrients such as glucose, urea and dipotassium hydrogen phosphate to the culture tank every day to make the C:N :P≈100:5:1, while controlling the dissolved oxygen in the culture tank>6mg / L, pH=6.5~8.5, temperature around 25℃, etc., so that the microorganisms in the culture tank can proliferate rapidly, and the biological activity is greatly improved. When water enters COD Mn When the concentration was reduced to 3.5mg / L, the biological activity in the membrane bioreactor was not good, and the biomass gradually decreased, and the domesticated activated sludge was added to the reactor for regulation. According to the ratio of domesticated sludge content ...

Embodiment 2

[0024] Membrane bioreactor influent COD Mn The concentration is 3.5~4.2mg / L, the ammonia nitrogen concentration is 0.5~1.3mg / L, and the hydraulic retention time is 1.5h. In the start-up stage of the membrane bioreactor, 2g / L of PAC was added to the reactor at one time as a microbial carrier, and no sludge was discharged during operation. In the meantime, take 10%~20% (volume ratio) of the sludge mixture from the membrane bioreactor into the biological culture tank, and add a certain amount of nutrients such as glucose, urea and dipotassium hydrogen phosphate to the culture tank every day to make the C:N :P≈100:5:1. At the same time, the DO>6mg / L, pH=6.5~8.5, and temperature in the culture tank are controlled at the same time, so that the microorganisms in the culture tank proliferate rapidly and the biological activity is greatly improved. When water enters COD Mn When the concentration is reduced to 3.5mg / L, the biological activity in the membrane bioreactor is poor and the...

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Abstract

The invention relates to a regulation and control method for the microbial activity in a membrane bioreactor for micro-polluted surface water treatment, belonging to the technical field of drinking water treatment and solving the problems that when the micro-polluted surface water is treated by adopting the traditional membrane bioreactor, the biological activity and the biomass in the membrane bioreactor are reduced due to the reasons of lower raw water organism concentration or low temperature and the like, and the water treatment effect becomes poorer. The regulation and control method can cultivate, regulate and control the mixed liquor in the membrane bioreactor to improve the microbial activity in the mixed liquor, so that the stable running of the membrane bioreactor is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of drinking water treatment, and in particular relates to a method for regulating biological activity in a membrane bioreactor used for treating slightly polluted surface water. Background technique [0002] Compared with the traditional drinking water treatment technology, the membrane bioreactor for drinking water treatment has the advantages of good effluent water quality, compact equipment, small footprint, less residual sludge, flexible and stable operation, and easy automatic control. In membrane bioreactors, biological action plays a dominant role in removing organic matter, and the effect of biological treatment directly affects the effect of membrane bioreactors. Due to the relatively small content of nutrient substrates in slightly polluted source water, the growth characteristics of microorganisms in membrane bioreactors are different from those in domestic sewage treatment. In order to maintain t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/00
Inventor 叶河秀王媛张永吉周玲玲
Owner TONGJI UNIV
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