苯系化合物好氧生物降解性研究

选用城市污水处理场的活性污泥做菌源，研究了苯、甲苯、邻－间－、对－二甲苯、乙基苯、三甲苯等七种芳香化合物的好氧生物降解规律。实验结果表明，七种化合物浓度在１０ｍｇ／ｌ左右时，在实验周期内能全部降解；浓度在４０－１８０ｍｇ／ｌ时，有的化合物不能被降解。七种化合物降解的难易程度为：甲苯＞间二甲苯＞苯＞对二甲苯＞乙基苯＞三甲苯＞邻二甲苯。此外，实验结果还表明，化合物的降解性受苯环上取代基数量及位置等因素

BIODEGRADABILITY OF HYDRO-CARBONS UNDER AEROBIC CONDITION

The biodegradation of benzene and its homoiogs, such as toluene, o-xy-lene,m-xylene, p-xylerie, ethyibenzene, and 1,3,15-trimethyibenzene was studied with mixed culture from activated sludge. These aromatic hydrocarbons can be degraded easily when the concentrations are below 10mg/L The biodegradabiiity of the compounds are in the order of the following: toluene, m-xylene, benzene,p-xylene, ethyibenzene, 1,3, 5-trimethylbenze-ne, o-xylene. It is found that the number and position of methyl group on benzene nuclous cause significant differences in biodegradabiiity of these compounds.