Bioleaching of spent Ni-Cd batteries by continuous flow system: effect of hydraulic retention time and process load

Journal of Hazardous Materials
Ling ZhaoNanwen Zhu

Abstract

Spent Ni-Cd batteries bring a severe environmental problem that needs to be solved urgently. A novel continuous flow two-step leaching system based on bioleaching was introduced to dissolve heavy metals in batteries. It consists of an acidifying reactor which was used to culture indigenous thiobacilli and a leaching reactor which was used to leach metals from spent batteries. The indigenous acidophilic thiobacilli in sewage sludge was used as the microorganisms and the sludge itself as culture medium. Bioleaching tests at different hydraulic retention time (HRT) and process load in the leaching reactor were performed. The results showed that the longer the HRT (1, 3, 6, 9 and 15 days) was, the more time required to achieve the complete leaching of Ni, Cd and Co. The maximum dissolution of cadmium and cobalt was achieved at higher pH values (3.0-4.5) while the leaching of nickel hydroxide and nickel in metallic form (Ni0) were obtained separately in different acidity (pH 2.5-3.5). It cost about 25, 30 and more than 40 days to remove all of the three heavy metals with the process load of two, four and eight Ni-Cd batteries under the conditions that the ingoing bio-sulphuric acid was 1Ld(-1) and HRT was 3 days.

References

Mar 10, 2000·Applied Microbiology and Biotechnology·M NematiS T Harrison
Apr 30, 2003·Applied Microbiology and Biotechnology·H-L LiuY-C Cheng
Oct 3, 2003·Waste Management·Nanwen ZhuChunguang Cai
Apr 15, 2004·Waste Management·Yue-qing Xia, Guo-jian Li
Apr 19, 2005·Chemosphere·T KinoshitaK Takahashi
Aug 2, 2005·Environmental Geochemistry and Health·S D KimD K Cha
Aug 30, 2005·Journal of Hazardous Materials·Yunqing Li, Guoxi Xi
Aug 5, 2006·Journal of Hazardous Materials·Yun-Guo LiuTing Fan

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Citations

Jan 7, 2014·The Journal of Microbiology·Debaraj Mishra, Young Ha Rhee
Sep 20, 2011·Waste Management·Jae-Chun Lee, Banshi Dhar Pandey
Apr 8, 2014·Environmental Technology·Umesh U Jadhav, Hong Hocheng
Dec 1, 2009·Environmental Science & Technology·Kui HuangZhenming Xu

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