石英砂提高城市污泥生物沥浸效率主导因素分析

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Abstract Major factors affecting the improvement of bioleaching efficiency with the participation of quartz sand were investigated. Results showed that the bioacidification of A. ferrooxidans was the dominant factor in the first 0~72h. After 72h, the formation of secondary minerals was more significant than the bioacidification of A. ferrooxidans in improving sludge dewaterability, thereby became the major factor. The gradual increment in the yield of secondary minerals could be attributed to the continuing bioleaching process, and further increased the dewaterability based on bioacidification. The specific resistance to filtration (SRF) of municipal sludge declined from the initial value of 17.13×10¹²m/kg to a minimum of 3.56×10¹²m/kg at 48h under the joint action of bioacidification and secondary minerals. By comparison, the minimum sludge SRF under each single factor could be observed at 72h, i.e., 3.89×10¹²m/kg for bioacidification and 4.77×10¹²m/kg for secondary minerals. Thus, the joint action of these two factors was more efficient in reducing the bioleaching time and further improving sludge dewaterability.

Key words： municipal sludge bioleaching Acidithiobacillus ferrooxidans quartz sand dewaterability

Received: 16 September 2020

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X705

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	Articles by authors
	SONG Yong-wei
	MA Ying-ying
	WANG rui
	WU Yi-qian
	WANG He-ru

Cite this article:

SONG Yong-wei,MA Ying-ying,WANG rui等. The analysis of dominant factors in enhancing municipal sludge bioleaching efficiency by quartz sand[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(5): 2283-2289.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I5/2283

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