Improvement of sludge dewaterability and removal of sludge-borne metals by bioleaching at optimum pH

Journal of Hazardous Materials
Fenwu LiuDianzhan Wang

Abstract

Bio-acidification caused by bio-oxidation of energy substances during bioleaching is widely known to play an important role in improving sludge-borne metals removal. Here we report that bioleaching also drastically enhances sludge dewaterability in a suitable pH level. To obtain the optimum initial concentrations of energy substances and pH values for sludge dewaterability during bioleaching, bio-oxidation of Fe(2+) and S(0) under co-inoculation with Acidithiobacillus thiooxidans TS6 and Acidothiobacillus ferrooxidans LX5 and their effects on sludge dewaterability and metals removal during sludge bioleaching were investigated. Results indicated that the dosage of energy substances with 2g/L S(0) and 2g/L Fe(2+) could obtain bio-oxidation efficiencies of up to 100% for Fe(2+) and 50% for S(0) and were the optimal dosages for sludge bioleaching. The removal efficiencies of sludge-borne Cu and Cr could reach above 85% and 40%, respectively, and capillary suction time (CST) of bioleached sludge decreased to as low as ∼10s from initial 48.9s for fresh sludge when sludge pH declined to ∼2.4 through bioleaching. These results confirm the potential of bioleaching as a novel method for improving sludge dewaterability as well as removal ...Continue Reading

References

Mar 12, 2003·Journal of Hazardous Materials·E Neyens, J Baeyens
May 21, 2005·Journal of Hazardous Materials·Ying-Xu ChenGuang-Ming Tian
Feb 7, 2007·Journal of Environmental Sciences (China)·Shun-gui ZhouDi Fang
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Citations

Apr 11, 2013·Bioresource Technology·Wansheng ShiZhenya Zhang
Oct 21, 2015·Waste Management·Zhihua ChenBo Xiao
Apr 21, 2016·Bioresource Technology·Jonathan W C WongShuk-Man Yu
Jul 15, 2015·Journal of Environmental Management·Xun-An NingJingyong Liu
Oct 15, 2013·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Ashish PathakDong J Kim
Jul 18, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Qingfang ZhangZengye Yang
Sep 28, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Qingyang ZhouRuiqin Zhang
May 4, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jingqing GaoYong Chen
Feb 24, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jonathan W C WongAmmaiyappan Selvam
Aug 29, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wenfeng YangHoufeng Xiong
Jan 13, 2019·Environmental Science and Pollution Research International·Chia-Yuan ChangChart Chiemchaisri
Apr 21, 2019·Environmental Science and Pollution Research International·Mingyan ShiYaoqian Chen
Apr 2, 2020·Environmental Science and Pollution Research International·Chunsheng QiuLiping Sun
Oct 11, 2020·Environmental Science and Pollution Research International·Kai ChenJinping Li
Oct 3, 2021·Environmental Science and Pollution Research International·Yulan LuYu Dai

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