Enzymatically induced phosphate precipitation (EIPP) for stabilization/ solidification (S/S) treatment of heavy metal tailings

doi:10.1016/j.conbuildmat.2021.125577

	Enzymatically induced phosphate precipitation (EIPP) for stabilization/ solidification (S/S) treatment of heavy metal tailings
	Han, Li-Jun 4,5; Li, Jiang-Shan 3,5; Xue, Qiang 5; Guo, Ming-Zhi 2; Wang, Ping 5; Poon, Chi Sun 1,3
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2022-01-03
卷号	314 页码:11
关键词	Enzymatically induced phosphate precipitation (EIPP) Stabilization solidification (S S) Tailings Unconfined compressive strength Leaching
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2021.125577
英文摘要	The accumulation of heavy metal tailings has caused serious environmental and geological concerns. Therefore, treatment and recycling of heavy metal tailings have become urgent and vital. To this end, this paper proposes a biological solidification and stabilization (S/S) method, which applies enzymatically induced phosphate precipitation (EIPP) to strengthen Pb-Zn tailings and reduce the hazard of the heavy metals. The effectiveness and mechanism of EIPP-S/S have been systematically explored, including the effect of enzyme and reactant concentration, and tailings density on the treatment efficiency. The results showed that MgHPO4(H2O)3 (newberyite) and Pb9(PO4)6 were the main products of EIPP. The newberyite strengthened the tailings through connecting tailing particles and filling the pores, and the solidification effect was positively related to the reactant content and tailing compactness. The strength of the treated tailing sample could reach 2.7 MPa at a relative density of 90% with a reactant concentration of 1.5 M. After treatment, about 40% of Pb in the tailings changed from an acid-soluble state to oxidation state and residual state, as a result of the precipitation of Pb9(PO4)6. The concentration of leached Pb from the treated tailings under an acid rain environment was reduced from 0.86 mg/L before treatment to less than 0.02 mg/L, well below the limit of 0.1 mg/L in China's ground/surface water. This study provides new insights into the treatment and reuse of tailings by applying an innovative EIPP-S/S method, which can flexibly treat tailings in an environmentally friendly manner.
资助项目	National Key Research and Development Programme[2019YFC1804002] ; International Partnership Program of Chinese Academy of Sciences[115242KYSB20200002] ; National Natural Science Foundation of China/Hong Kong Research Grants Council Joint Research Scheme[51861165104] ; CAS Pioneer Hundred Talents Program in China ; Open Research Fund of State Key Laboratory of Geo-mechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, China[Z020012]
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000722661200001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28302]
专题	中科院武汉岩土力学所
通讯作者	Li, Jiang-Shan
作者单位	1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China 2.Hohai Univ, Coll Mech & Mat, Nanjing 213022, Peoples R China 3.IRSM CAS, HK PolyU Joint Lab Solid Waste Sci, Wuhan 430071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Han, Li-Jun,Li, Jiang-Shan,Xue, Qiang,et al. Enzymatically induced phosphate precipitation (EIPP) for stabilization/ solidification (S/S) treatment of heavy metal tailings[J]. CONSTRUCTION AND BUILDING MATERIALS,2022,314:11.
APA	Han, Li-Jun,Li, Jiang-Shan,Xue, Qiang,Guo, Ming-Zhi,Wang, Ping,&Poon, Chi Sun.(2022).Enzymatically induced phosphate precipitation (EIPP) for stabilization/ solidification (S/S) treatment of heavy metal tailings.CONSTRUCTION AND BUILDING MATERIALS,314,11.
MLA	Han, Li-Jun,et al."Enzymatically induced phosphate precipitation (EIPP) for stabilization/ solidification (S/S) treatment of heavy metal tailings".CONSTRUCTION AND BUILDING MATERIALS 314(2022):11.