Effect of chlorinated aliphatic hydrocarbons on the acetoclastic methanogenic activity of granular sludge

被引:27
作者
Sanz, JL
Rodriguez, N
Amils, R
机构
[1] Centro de Biología Molecular, Univ. Autónoma de Madrid
关键词
D O I
10.1007/s002530050935
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The toxicity of chlorinated aliphatic hydrocarbons on acetoclastic methanogens in anaerobic granular sludge was determined using a standardized anaerobic bioassay method. Most of the chloroaliphatics tested were strong inhibitors of methanogenesis. Triand tetrachloride derivatives of methane and ethane were the most highly toxic compounds tested, with concentrations of less than 18 mg/l resulting in 50% inhibition (IC50) Of the methanogenic activity. Dichlorinated compounds were less toxic, with IC50 values ranging from 40 mg/l to 100 mg/l. On the other hand, perchlorinated derivatives of ethane and ethene were scarcely inhibitory at concentrations near their maximum water solubility. The toxicity caused by chlorinated aliphatic hydrocarbons was reversible. The comparison of structurally related compounds indicated that unsaturated chloroaliphatics were less toxic than their saturated counterparts. A reverse correlation between the electric dipole moment of these compounds and their methanogenic toxicity is discussed.
引用
收藏
页码:324 / 328
页数:5
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