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Method for defoaming in organism aerobic batch cultivation

A batch and biological technology, applied in aerobic process treatment, sustainable biological treatment, foam dispersion/prevention, etc., to achieve the effects of easy technical transformation, reduction of secondary pollution, and low operating costs

Inactive Publication Date: 2010-08-25
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of a large amount of foam generated in the process of biological aerobic batch cultivation, the present invention develops an active defoaming method to control the generation of foam. This method only needs to recirculate part of the mixed liquid in the original structure through the existing water inlet and outlet pipes. Operation (that is, pseudo-continuous operation mode), effectively controls the generation of foam by controlling the parameters such as the return flow rate and the rising flow rate in the reaction structure, so it is obviously different from the passive defoaming method represented by defoaming agents and defoaming devices or the end of the foam. Control Method

Method used

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Examples

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Effect test

Embodiment 1

[0016] In a certain industrial wastewater treatment, microorganisms were inoculated in the reactor and sludge batch aerobic cultivation was carried out. When the MLSS reached 8g / L, a large number of foams began to appear, and the height reached 20cm. The defoaming method of a kind of biological aerobic batch cultivation according to the present invention was adopted. Methods, the specific measures are to pump the outlet water back, the flow rate of the backflow is 0.7L / min, the rising flow rate of the liquid after backflow is 0.6L / min, and the backflow time is 15min. After adopting this method, the original foam in the initial reactor gradually becomes smaller, and no new foam is produced, and the foam height is reduced to 2 cm after half an hour.

Embodiment 2

[0018] In a certain penicillin fermentation production process, after inoculating fermenting microorganisms into the fermenter, batch fermentation culture is carried out. As the fermentation progresses, the bubbles gradually accumulate and overflow phenomenon occurs, and the foam height is 36cm. A biological aerobic For the defoaming method of batch cultivation, the specific measures are to return the effluent with a pump, the return flow rate is 10L / min, the rising flow rate of the liquid after the return is 2L / min, and the return time is 60min. After adopting this method, the original foam in the initial fermenter gradually becomes smaller, and no new foam is produced. After 30 minutes, the height of the foam is reduced to 8 cm, and after 1 hour, the foam completely disappears. The total amount of fermentation product is almost unchanged before and after using the defoaming method.

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Abstract

For solving the problem that a large amount of air bubbles are generated in an organism aerobic batch cultivation process, the invention, based on the knowledge of microorganism growth kinetics and micro ecological kinetics, develops an active defoaming method for controlling foam generation. Obviously differing from the passive defoaming method or foam end control methods represented by defoamers and defoaming devices, the method effectively controls the generation of foam by allowing part of mixed liquid in an original building to run in the traditional inlet and outlet water pipes in a backflow and circulation mode, namely a fake continuous running mode, and by controlling parameters such a backflow speed and an upflow speed in a reaction structure. The method avoids using a defoamer or defoaming device and polluting culture liquid with the defoamer, retains the structure of the original structure, saves investment cost to a maximum degree, and meets the requirements for cost-effect combination and low operation cost in actual operation. The method is mainly suitable to be used for removing foam generated in a sludge batch aerobic culture process in the field of waste water biological treatment and an aerobic batch fermentation process in the field of biological fermentation.

Description

technical field [0001] The invention belongs to the field of wastewater biological treatment and biological fermentation, and in particular relates to a novel defoaming method in a biological aerobic batch cultivation process. The method is mainly applicable to the elimination of foam in the sludge aerobic batch cultivation process in the wastewater biological treatment field and in the aerobic batch fermentation process in the biological fermentation field. Background technique [0002] Wastewater biological aerobic treatment process (continuous flow or sequential batch) needs to cultivate sludge in batches under aeration conditions to obtain sufficient biomass to meet the biomass needs of continuous flow or sequential batch operation. This process is often A large number of air bubbles will be produced and a higher foam layer will be formed, which will eventually overflow from the aeration tank, causing inconvenience to the sludge cultivation operation. Similarly, in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/02C02F3/02
CPCY02W10/10
Inventor 郑少奎崔粲粲李慧君
Owner BEIJING NORMAL UNIVERSITY
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