Dev Subhabrata, Roy Shantonu, Bhattacharya Jayanta
Department of Mining Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
Department of Chemical and Biotechnology, National Institute of Technology Arunachal Pradesh, Yupia, 791112, India.
J Environ Manage. 2017 Sep 15;200:135-144. doi: 10.1016/j.jenvman.2017.04.102. Epub 2017 May 31.
The present study discusses the potentiality of using anaerobic Packed Bed Bioreactor (PBR) for the treatment of acid mine drainage (AMD). The multiple process parameters such as pH, hydraulic retention time (HRT), concentration of marine waste extract (MWE), total organic carbon (TOC) and sulfate were optimized together using Taguchi design. The order of influence of the parameters towards biological sulfate reduction was found to be pH > MWE > sulfate > HRT > TOC. At optimized conditions (pH - 7, 20% (v/v) MWE, 1500 mg/L sulfate, 48 h HRT and 2300 mg/L TOC), 98.3% and 95% sulfate at a rate of 769.7 mg/L/d. and 732.1 mg/L/d. was removed from the AMD collected from coal and metal mine, respectively. Efficiency of metal removal (Fe, Cu, Zn, Mg and Ni) was in the range of 94-98%. The levels of contaminants in the treated effluent were below the minimum permissible limits of industrial discharge as proposed by Bureau of Indian Standards (IS 2490:1981). The present study establishes the optimized conditions for PBR operation to completely remove sulfate and metal removal from AMD at high rate. The study also creates the future scope to develop an efficient treatment process for sulfate and metal-rich mine wastewater in a large scale.
本研究探讨了使用厌氧填充床生物反应器（PBR）处理酸性矿山排水（AMD）的潜力。采用田口设计法共同优化了多个工艺参数，如pH值、水力停留时间（HRT）、海洋废弃物提取物（MWE）浓度、总有机碳（TOC）和硫酸盐。发现各参数对生物硫酸盐还原的影响顺序为pH＞MWE＞硫酸盐＞HRT＞TOC。在优化条件下（pH值为7、MWE为20%（v/v）、硫酸盐为1500 mg/L、HRT为48 h、TOC为2300 mg/L），从煤矿和金属矿采集的AMD中分别以769.7 mg/L/d和732.1 mg/L/d的速率去除了98.3%和95%的硫酸盐。金属去除效率（铁、铜、锌、镁和镍）在94% - 98%范围内。处理后废水中的污染物水平低于印度标准局（IS 2490:1981）提出的工业排放最低允许限值。本研究确定了PBR运行的优化条件，以高速率完全去除AMD中的硫酸盐和金属。该研究还为大规模开发高效处理富含硫酸盐和金属的矿山废水的工艺创造了未来空间。
