6种挥发性有机物在甲苯驯化微生物中的好氧生物降解性能

利用振荡摇瓶法测定了6种典型挥发性有机物,甲苯、邻二甲苯、间二甲苯、对二甲苯、苯和氯苯在甲苯驯化微生物中的好氧生物降解性能.结果表明,在本研究的液相浓度范围内(甲苯＜174mg/L,邻二甲苯＜149mg/L,间二甲苯＜129mg/L,对二甲苯＜133mg/L,苯＜234mg/L,氯苯＜146mg/L),3种二甲苯、苯和氯苯的降解速率随其初始浓度的增大而增加,符合一级反应,这5种VOCs未对微生物产生明显的抑制或毒害作用;甲苯的液相浓度大于85mg/L时,其降解速率不随初始浓度的增大而改变,其降解规律符合Monod方程.

Aerobic Biodegradation Performance of Six Volatile Organic Compounds by Activated Sludge Acclimated with Toluene

The degradation performance of six volatile organic compounds (VOCs), toluene, o-xylene, m-xylene, p-xylene, benzene and chlorobenzene by activated sludge acclimated with toluene were studied. The experimental results showed that the biodegradation rates of o-xylene, m-xylene, p-xylene, benzene and chlorobenzene increased with increasing of their initial liquid concentration; when concentrations of o-xylene, m-xylene, p-xylene, benzene and chlorobenzene were less than 149mg/L, 129mg/L, 133mg/L, 234mg/L and 146mg/L respectively, neither of them brought any notable inhibition or poisonous effects on microbes, and their aerobic biodegradation accorded with first-order reaction. When concentrations of toluene were more than 85mg/L, its biodegradation rate didn't increase with increasing of its initial liquid concentration and the biodegradation of toluene accorded with the Monod equation.