Mechanisms of copper stabilization by mineral constituents in sewage sludge biochar

Shen, Tingting1,2; Tang, Yuanyuan1; Lu, Xiao-Ying3; Meng, Zhe1

2018-08-20

10.1016/j.jclepro.2018.05.071

Journal of Cleaner Production   影响因子和分区

0959-6526

1879-1786

Sewage sludge has gained increasing attention as one of the most intractable environmental concerns. Pyrolysis is a promising technology that can convert the sewage sludge into biochar and the produced biochar has been increasingly used as adsorbents for heavy metal remediation. However, further environmental problems will be generated from the accumulation of spent biochar after metal adsorption. This work involved a series of experiments to study the adsorption of hazardous copper on the sewage sludge-derived biochar. A novel method was then proposed to stabilize the adsorbed copper in the biochar matrices. The results showed a growth in copper adsorption capacity with an increase in the initial pH of the solutions, and positive effects on copper adsorption were detected from the mineral constituents (e.g., silicon, aluminium, iron and calcium) of the sludge biochar. Furthermore, after copper adsorption, the spent biochar was thermally sintered, and the hazardous copper was found to be incorporated into a CuAl2O4 spinel phase through thermal reactions between copper and the mineral constituents. The stabilization effect on copper was further evaluated in the sintered ceramic products, and copper leachability was found to decrease by a factor of approximately 65 when samples were subjected to a leaching fluid with a pH of 2.9. A series of copper-enriched biochars was prepared to further explain the reaction mechanisms, which showed that aluminium-containing minerals and iron oxide were the most important constituents for copper stabilization. Through this study, a dual effect of the mineral constituents in the biochar was reported on both copper removal and further stabilization, which suggested a strategy to achieve sustainable waste management in an effective and environmentally friendly way. (C) 2018 Published by Elsevier Ltd.

Copper Adsorption Thermal stabilization Mineral constituents Sewage sludge biochar

SCI ; EI

英语

第一 ; 通讯

Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control[2017B030301012]

Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology

Green & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences

WOS:000437997200014

ELSEVIER SCI LTD

20182405302376

Adsorption ; Aluminum compounds ; Ceramic products ; Copper ; Copper compounds ; Heavy metals ; Iron oxides ; Minerals ; pH effects ; Sewage sludge ; Sintering ; Stabilization ; Waste management

Sewage Treatment:452.2 ; Minerals:482.2 ; Metallurgy and Metallography:531 ; Copper:544.1 ; Chemistry, General:801.1 ; Chemical Operations:802.3 ; Inorganic Compounds:804.2 ; Ceramics:812.1 ; Accidents and Accident Prevention:914.1

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Guangdong Prov Key Lab Soil & Groundwater Pollut, Shenzhen 518055, Peoples R China
2.Univ Macau, Fac Sci & Technol, Dept Civil & Environm Engn, Macau, Peoples R China
3.Technol & Higher Educ Inst Hong Kong, Fac Sci & Technol, Hong Kong, Hong Kong, Peoples R China

Shen, Tingting,Tang, Yuanyuan,Lu, Xiao-Ying,et al. Mechanisms of copper stabilization by mineral constituents in sewage sludge biochar[J]. Journal of Cleaner Production,2018,193:185-193.

Shen, Tingting,Tang, Yuanyuan,Lu, Xiao-Ying,&Meng, Zhe.(2018).Mechanisms of copper stabilization by mineral constituents in sewage sludge biochar.Journal of Cleaner Production,193,185-193.

Shen, Tingting,et al."Mechanisms of copper stabilization by mineral constituents in sewage sludge biochar".Journal of Cleaner Production 193(2018):185-193.