Cr^(6+)对厌氧微生物的毒性作用研究

Study on the toxicity to anaerobic microbe by Cr^(6+)

通过对取自ASBR中的厌氧污泥Cr6 +中毒的产甲烷活性恢复试验 ,研究了不同Cr6+质量浓度对产甲烷微生物的抑制程度及抑制作用的分子机理 ,得出结论 :当Cr6+质量浓度小于 30mg/L时 ,是生理毒素 ;当Cr6+质量浓度大于 1 1 0mg/L时 ,是杀菌性毒素以及当Cr6+质量浓度小于 1 0mg/L时 ,其抑制作用发生在反应后期 ;当Cr6+质量浓度大于 30mg/L时 ,其抑制作用发生在反应初期 .通过对不同Cr6+质量浓度下的厌氧微生物群落及产甲烷菌形态的照片分析 ,发现Cr6 +对厌氧微生物群落的组成和厌氧微生物的形态没有影响 。

Based on the experiment of the toxicity to the anaerobic sludge methanogens and the recovery of the methanogentic activity, the level of inhibition to methanogens by various Cr 6+ concentrations and the molecule mechanism of inhibition are analyzed. It is concluded that when the Cr 6+ concentration is less than 30 mg/L, it is physiological toxin, but bactericidal toxin when concentration is more than 110 mg/L. The inhibition takes place in anaphase when Cr 6+ concentration is less than 10 mg/L, and in prophase when Cr 6+ concentration is more than 30 mg/L. Based on the photograph discussion of the anaerobic species and the methanogens morphology under the various Cr 6+ concentrations, it is noted that the Cr 6+ inhibition has no obvious influence on the anaerobic species and the methanogens morphology, but it strongly inhibits the activity of methanogens.