Understanding of the biochemical events in a chemo-bioreactor during continuous acid mine drainage treatment

被引:0
作者
Bidus Kanti Das
Santi M. Mandal
Jayanta Bhattacharya
机构
[1] Indian Institute of Technology Kharagpur,Department of Mining Engineering
[2] Indian Institute of Technology Kharagpur,Central Research Facility
来源
Environmental Earth Sciences | 2012年 / 66卷
关键词
Acid mine drainage; Fixed bed chemo-bioreactor; Spent mushroom compost; Sulfate reducing bacteria; Organic carbon drought; Biochemical events;
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中图分类号
学科分类号
摘要
Spent mushroom compost (SMC) is widely used as reactor matrix in passive bioreactor involving sulfate reducing bacteria (SRB) for acid mine drainage (AMD) treatment. Follow-up our previous report, recent work has been established the extent of activity, sustained organic carbon availability, and the biochemical events of successive alkalinity producing system-based chemo-bioreactor for continuous performance using SMC. Removal of iron and sulfate from influent was over 77 and 90%, respectively, for first 13 weeks, while sulfate removal efficiency suddenly dropped down to 31% thereafter. Ahead of 13th week, process failure was beginning to be noticed when available dissolved organic carbon (DOC) value dropped down to 50 mg/L. SRB population was mostly affected with DOC drought at this stage. Sulfur was one of the major elements found with other tested metals in blackish green effluent precipitate. Sulfide compounds of the tested metals were formed on both exhausted chemo-bioreactor bed and precipitate. FTIR analysis indicated that SMC was responsible for metal binding and available nutrients supply. The present study revealed the feasibility of SMC as a host for treating AMD by this chemo-bioreactor that will assist in designing the continuous treatment practice.
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页码:607 / 614
页数:7
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