生物法降解含油污泥反应器流场及工作参数研究

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Abstract In order to improve the degradation efficiency of oily sludge by bioreactor, the degradation process of oily sludge by pseudomonas aeruginosa NY3 in bioreactor were studied. The gas-liquid-solid three-phase flow field dynamics model and population balance model (PBM) in the bioreactor were established, and the bubble diameter distribution and stirring speed were simulated by FLUENT software. It was studied that the bubbles with a diameter of less than 6mm account for 85%, which can effectively increase the concentration of dissolved oxygen in the reaction system,and the optimal off-bottom suspension speed of the reactor was 150r/min. Secondly, the relationship model of aeration rate with time was established by using the principle of oxygen conservation, and the optimal bacterial uptake was determined to be 15.23% and the temperature was 32.56℃ through design experiments, which guided the selection of technological parameters in the final degradation process. Finally, the optimal working parameters were set, and 6kg oily sludge was degraded by multi-functional bioreactor. After 9 days of reaction, the degradation rate of petroleum hydrocarbon was up to 86.20%, and the oil content was 1.46%. The bioreactor degradation of oily sludge has the advantages of short cycle and high efficiency, and provides an effective and reliable new way for the treatment of oily sludge.

Key words： bioreactor degradation oily sludge three-phase flow field optimal working parameter

Received: 08 October 2021

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X705

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	LUO Fei
	HE Li-le

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LUO Fei,HE Li-le. Study on flow field and working parameters of bioreactor for oily sludge degradation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1754-1761.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1754

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