摘要
文章以乙酸钠作为对照底物,研究分析了在不同铜离子质量浓度下,硫酸盐还原菌(sulfate-reducingbacteria,简称SRB)以油菜秸秆为基质处理酸性矿山排水的过程及其主要影响因素。结果表明:当初始铜离子质量浓度分别为0、6.4、12.8、32.0、48.0mg/L时,反应初期各体系内的pH值从5.0迅速升高到7.0～7.5,实验结束后SO42-去除率都超过了94%,反应器中TOC质量浓度在实验开始几天内均先上升,并在达到峰值后迅速下降;而重金属存在时,以乙酸钠为底物的反应器内SO42-还原速率及去除效率都受到显著抑制。研究还表明,秸秆的吸附作用降低了铜离子对SRB的毒性作用。因此,油菜秸秆为底物不仅可以提供缓释碳源,而且可以作为吸附剂减弱重金属离子对SRB的抑制作用。
With sodium acetate as carbon source, the process and main influencing factors of treating synthetic acid mine drainage（AMD） by sulfate-reducing bacteria（SRB） using rape straw as substrate were studied under different copper ion concentrations. Experimental results show that when the initial Cu（Ⅱ） concentration is at 0, 6.4 , 12.8, 32.0 and 48.0 mg/L respectively, the pH value increases rapidly from 5.0 to 7.0-7.5 in the early period and the reduction percents of the sulfate concentra- tion in all reactors are above 94% finally. The total organic carbon（TOC） concentrations in all reac- tors first increase in the initial several days and then decrease quickly after reaching peak values. When Cu（Ⅱ） is available, the reduction rate and removal efficiency of sulfate are significantly inhibi- ted in the reactors using sodium acetate as carbon source. It is also indicated that the adsorption of rape straw can reduce the negative effect of copper ion on SRB. Therefore, rape straw can be used as slow-releasing carbon source as well as adsorbent, which can reduce the inhibition effect of heavy metals on SRB.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第12期1676-1680,共5页
Journal of Hefei University of Technology：Natural Science
基金
国家重点基础研究发展计划(973)资助项目(2011CB411904)
国家自然科学基金资助项目(40902019
41102214
41172216)
关键词
硫酸盐还原菌
酸性矿山排水
油菜秸秆
重金属
乙酸钠
sulfate-reducing bacteria（SRB）
acid mine drainage（AMD）
rape straw
heavy metal
so dium acetate
