A continuous pilot-scale system using coal-mine drainage sludge to treat acid mine drainage contaminated with high concentrations of Pb, Zn, and other heavy metals

Cui, M. and Jang, M. and Cho, S.H. and Khim, J. and Cannon, F.S. (2012) A continuous pilot-scale system using coal-mine drainage sludge to treat acid mine drainage contaminated with high concentrations of Pb, Zn, and other heavy metals. Journal of Hazardous Materials, 215-21. pp. 122-128. ISSN 0304-3894

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Abstract

A series of pilot-scale tests were conducted with a continuous system composed of a stirring tank reactor, settling tank, and sand filter. In order to treat acidic drainage from a Pb-Zn mine containing high levels of heavy metals, the potential use of coal-mine drainage sludge (CMDS) was examined. The pilot-scale tests showed that CMDS could effectively neutralize the acidic drainage due to its high alkalinity production. A previous study revealed that calcite and goethite contained in CMDS contributed to dissolutive coprecipitation and complexation with heavy metals. The continuous system not only has high removal efficiencies (97.2-99.8), but also large total rate constants (K total, 0.21-10.18h -1) for all heavy metals. More specifically, the pilot system has a much higher Zn(II) loading rate (45.3gm -3day -1) than other reference systems, such as aerobic wetland coupled with algal mats and anoxic limestone drains. The optimum conditions were found to be a CMDS loading of 280gL -1 and a flow rate of 8Lday -1, and the necessary quantity of CMDS was 91.3gL -1day -1, as the replacement cycle of CMDS was determined to be 70 days. © 2012 Elsevier B.V..

Item Type: Article
Additional Information: Cui, Mingcan Jang, Min Cho, Sang-Hyun Khim, Jeehyeong Cannon, Fred S eng Research Support, Non-U.S. Gov't Netherlands 2012/03/17 06:00 J Hazard Mater. 2012 May 15;215-216:122-8. doi: 10.1016/j.jhazmat.2012.02.042. Epub 2012 Feb 24.
Uncontrolled Keywords: Acid mine drainage, Heavy metal, Sludge, Stirring tank reactor, Acidic drainage, Algal mat, Anoxic limestone drains, Continuous system, High concentration, Loading rate, Optimum conditions, Pilot scale, Pilot scale test, Pilot system, Reference systems, Removal efficiencies, Replacement cycles, Sand filter, Tank reactors, Anoxic sediments, Carbonate minerals, Drainage, Heavy metals, Lead, Loading, Rate constants, Tanks (containers), Zinc compounds, Zinc, calcium carbonate, ferric hydroxide, limestone, alkalinity, bioreactor, coal mine, flow pattern, neutralization, precipitation (chemistry),, waste treatment, article, coal mine drainage sludge, coal mining, flow rate, industrial sludge, precipitation, waste water treatment plant, wetland, Ferric Compounds, Industrial Waste, Iron Compounds, Metals, Heavy, Minerals, Refuse Disposal, Water Pollutants, Chemical, algae,
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 29 Jan 2014 06:57
Last Modified: 29 Jan 2014 06:57
URI: http://eprints.um.edu.my/id/eprint/9188

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