| 乙醇对硫酸盐还原-甲烷发酵效率影响的研究 |
| 摘要点击 2257 全文点击 1148 投稿时间：2008-03-19 修订日期：2008-05-16 |
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| 中文关键词 硫酸盐还原菌 产酸菌 产甲烷菌 乙醇 协同作用 吹脱 |
| 英文关键词 sulfate-reducing bacteria (SRB) acidogenic bacteria (AB) methane-producing bacteria (MPB) ethanol cooperation stripping |
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| 中文摘要 |
| 针对硫酸盐还原菌（SRB）、产酸菌（AB）和产甲烷菌（MPB）的生态位特征，采用两级厌氧与循环气提吹脱工艺，以蔗糖和乙醇为有机底物（COD为6 000 mg·L-1），在不同COD/SO2-4时分别研究了底物中乙醇浓度对硫酸盐还原、有机物去除和甲烷发酵效率的影响，以及系统的硫化物吹脱效果和最佳回流率.结果表明，乙醇的添加可以促进SO2-4还原，并使COD/SO2-4降低产生的竞争性抑制作用减弱，SRB、AB和MPB菌群处于良好的协同代谢状态.乙醇/SO2-4从0提升至2后系统的处理效率明显改善，COD/SO2-4为12、 6和4时的SO2-4还原率分别由7.7%、 8.1%、 14.1%提高为84.7%、 87.6%、 82.5%，COD去除率由83.3%、 76.5%、 69.6%提高为92.8%、 93.5%、 89.7%，CH4/COD由225.7、 204.6、 178.6 mL·g-1提高至278.5、 253.7、 236.1 mL·g-1.系统经10倍回流水稀释及气提吹脱30%～55%的硫化物后，硫化物浓度分别低于27.8、 38.4、 52.4 mg·L-1，有效地抑制了H2S的毒性作用.但回流率偏大（20倍）使底物浓度梯度过低，SO2-4还原率下降；回流率偏低（5倍）使污泥床无法充分膨胀，COD去除率降低. |
| 英文摘要 |
| Base on the different niche characteristics of sulfate-reducing bacteria (SRB)， acidogenic bacteria (AB) and methane-producing bacteria (MPB)， this experiment used two-stage anaerobic treatment and circular gas stripping. Sucrose and ethanol were used as organic substrate (COD=6 000 mg·L-1). The effect of ethanol concentration on sulfate reduction， COD removal and methanogenesis， the effect of sulfide stripping and the best recycle ratio were investigated respectively at different COD/SO2-4 ratios. The results indicate that the addition of ethanol promotes SO2-4 reduction， reduces inhibition of competition resulted from COD/SO2-4 decreasing， and makes SRB， AB and MPB in good synergetic metabolism. The efficiency of the system was improved obviously after ethanol/SO2-4 ratio enhanced from 0 to 2. When the ratios of COD/SO2-4 were 12， 6 and 4， SO2-4 reduction efficiencies increased from 7.7%， 8.1%， 14.1% to 84.7%， 87.6%， 82.5%， COD removal efficiencies increased from 83.3%， 76.5%， 69.6% to 92.8%， 93.5%， 89.7%， and CH4/COD increased from 225.7， 204.6， 178.6 mL·g-1 to 278.5， 253.7， 236.1 mL·g-1， respectively. Dilution at a recycle ratio of 10 and stripping 30%-55% sulfide controlled sulfide concentrations less than 27.8， 38.4， 52.4 mg·L-1， which inhibited effectively the toxicity of H2S. But higher recycle ratio (r=20) made substrate gradient too little and SO2-4 reduction efficiency reduced， while lower recycle ratio (r=5) made sludge bed shrunken and COD removal efficiency reduced. |
