市政污泥焚烧飞灰的工程性质

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Abstract The significant increase of sewage sludge incineration presents challenges for the proper management of emerging sewage sludge incineration ash (SSA). The engineering properties of SSA related to collection, transportation and disposal were analyzed by indoor geotechnical tests. The results showed that the moisture contents of SSA were mostly less than 1.5%, the specific gravities were 2.15~2.72, and their permeability was strong. The SSA samples had average particle sizes of less than 100μm, mostly classified as fine-grained soil. Their particle size distribution was relatively uniform, but most SSA were poorly graded. The natural repose angles of SSA were 38.8~55.0°, with poor fluidity. The increase of moisture content reduces the angle of repose. The SSA exhibited high limit moisture contents, but poor viscosity. The optimum moisture content of SSA for compaction was close to the plastic limit, while the maximum dry density was only 0.86~1.20g/cm³. When the moisture content was less than 30%, the increase of moisture had little effect on the dry density. The SSA particles were relatively stable and the compression coefficients were small. The SSA had a strong thermal effect when contacting with water, which could enhance landfill temperature and geotechnical damage.

Key words： sewage sludge incineration fly ash bag filter ash engineering properties landfill

Received: 15 May 2020

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X705

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	Articles by authors
	YU Si-yuan
	ZHANG Hua
	HE Pin-jing
	SHAO Li-ming

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YU Si-yuan,ZHANG Hua,HE Pin-jing等. Geotechnical properties of sewage sludge incineration ash[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 239-246.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/239

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