Toxicity of phenol towards anaerobic biogranules

被引:106
作者
Fang, HHP
Chan, OC
机构
[1] Environ. Engineering Research Centre, Dept. of Civ. and Struct. Eng., University of Hong Kong, Hong Kong, Pokfulam Road
关键词
anaerobic; biogranule; inhibition; methanogenic activity; phenol; shock; SMA; toxicity; UASB;
D O I
10.1016/S0043-1354(97)00069-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Toxity of phenol towards upflow anaerobic sludge blanket (UASB) biogranules treating wastewater containing different substrates was investigated. Under shock-loading conditions, the specific methanogenic activity (SMA) of the biogranules decreased with the increase of phenol concentration. The C-1.50 (i.e, the concentration at which bioactivity was 50% of the control) was 1750, 1000 and 1700 mg-phenol litre(-1) for acetate-, propionate- and benzoate-degrading biogranules, respectively. Under continuous-loading conditions, however, phenol toxicity was not progressive. Instead, phenol had a threshold toxicity level for each type of biogranules: 1050-1600, >850 and 1100-1700 mg litre(-1) for benzoate-, propionate- and acetate-degrading biogranules, respectively. Below these threshold levels, phenol was not inhibitive to the activity of biogranules; but above them, the inhibition was nearly 100%. Phenol toxicity was neither cumulative nor permanent. Once the phenol concentration in wastewater was lowered to levels below the threshold, biogranules were able to gradually regain 100% of their activity. Lowering substrate concentration expedited the recovering process. (C) 1997 Elsevier Science Ltd.
引用
收藏
页码:2229 / 2242
页数:14
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