| 以稻草和污泥为碳源硫酸盐还原菌处理酸性矿山排水 |
| 摘要点击 2003 全文点击 1159 投稿时间：2009-10-19 修订日期：2009-12-14 |
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| 中文关键词 酸性矿山排水 硫酸盐还原菌 碳源 污泥 稻草 乙醇 |
| 英文关键词 acid mine drainage(AMD) sulfate-reducing bacteria(SRB) carbon source sewage sludge rice straw ethanol |
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| 中文摘要 |
| 以污泥为硫酸盐还原菌(SRB)接种菌群，分别添加等量稻草和乙醇，研究了SRB以不同碳源处理酸性矿山排水(pH=2.5)的过程及不同碳源对硫酸盐还原和重金属去除的影响.结果表明，在无外加中和剂的情况下，污泥中的碱性物质可在反应开始的1 d内迅速中和酸性矿山排水的部分酸度，使反应体系pH值从2.5升至5.4～6.3，利于SRB的生长.污泥中含少量易被微生物分解的有机物，体系中仅含污泥时,SO2-4还原率最低(65.9%).添加稻草可促进SO2-4还原(79.2%)，因为污泥中的水解菌加速稻草分解，为SRB提供相对充足的碳源.添加乙醇为对照试验的体系中SO2-4还原率最高(97.9%).含污泥的反应体系Cu2+去除率均高于99%，SRB驯化前Cu2+的去除主要归因于污泥的吸附作用.以稻草和污泥为碳源可实现低成本酸性矿山排水处理，对矿山环境的原位修复有实际意义. |
| 英文摘要 |
| The performance of three organic carbon sources was assessed in terms of sulfate reduction and main metal removal, by using sewage sludge as the source of sulfate-reducing bacteria (SRB) and adding rice straw and ethanol with equal quantity. Results indicated that sewage sludge which contained certain amount of alkaline material could neutralize acidity of acid mine drainage(AMD) on the first day of experiment, elevating pH value from the initial 2.5 to around 5.4-6.3 and achieving suitable pH condition for SRB growth. Sewage sludge contained fewer biodegradable organic substance, reactive mixture with single sewage sludge showed the lowest sulfate reduction (65.9%). When the single sewage sludge was supplemented with rice straw, SRB reducing sulfate was enhanced (79.2%), because the degradation rate of rice straw was accelerated by the specific bacteria in sewage sludge, providing relatively abundant carbon source for SRB. Control experiment with ethanol was most effective in promoting sulfate reduction (97.9%). Metal removal efficiency in all three reactors was as high as 99% for copper, early copper removal was mainly attributed to the adsorption capacity of sewage sludge prior to SRB acclimation. It is feasible for using rice straw and sewage sludge as carbon sources for SRB treating acid mine drainage at a low cost, this may have significant implication for in situ bioremediation of mine environment. |
