复配材料钝化重金属污泥试验及工程应用研究

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Abstract Experiments and engineering application study on passivation of heavy metal (Cd, Cr, Cu, Ni, Pb and Zn) contaminated sediment in box culvert had been carried out, the passivating agents was consist of multi-component new high-efficiency materials and ordinary silicate mud. Unconfined compressive strength and toxic leaching concentration were studied to evaluate the stabilization effect, and the changes in the forms of heavy metals were further analyzed to explore the passivation mechanism. The results indicated that when mass ratio of sediments, compound materials and sand was 5:4:1, the passivation effect was the best. In practical engineering applications, the compressive strength of H-type and O-type cured bricks reached 10.82 and 10.11MPa respectively, and toxic leaching concentration of heavy metals was far lower than the identification standard value (GB5085.3-2007), which met the requirements of resource application. The leaching concentration of heavy metals was positively correlated with the proportions of ion exchange state and organic bond state proportions. Organic bond state and iron-manganese oxidation state were the main forms of heavy metals in sediments and solidified bricks respectively, which showed a completely opposite trend after solidification. This change played an important role in passivating heavy metals. Except for H-type Cr, the proportion of residual state in other cured bricks had all increased. This kind of compound material which based on multi-component interaction had a application prospect in passivation of heavy metals.

Key words： sediment heavy metal solidification and stabilization compound material engineering application

Received: 04 March 2021

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X52

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	Articles by authors
	TAN Juan
	WU Jian-qiang
	CHEN Chun
	GUO Jin-chuan
	WANG Yao-zu
	WANG Run-zhong
	HUANG Shen-fa

Cite this article:

TAN Juan,WU Jian-qiang,CHEN Chun等. Experiments and engineering application research on passivation of heavy metal contaminated sediment by compound material[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4857-4863.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4857

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