石化污泥对苯系化合物好氧生物降解的研究

为了探讨苯系化合物的生物降解途径，选用从石油化工污水处理场曝气池活性污泥中富集的混合菌种，在好氧条件下，研究了苯，甲苯，乙基苯，邻－，间－和对二甲苯的可生物降解性，当化合物的浓度为５０－１４０ｍｇ／Ｌ时，６种被试验化合物均可被微生物降解，从该混合菌种中筛选出１７株可降解甲苯，乙基苯，三甲苯，障－和对二甲苯的单一菌种，其中

Study on Biodegradability of Benzene Homolog Compounds by Mixed Bacteria from petrochemical Wastewater Treatment Plant

This paper reported the biodegradability of benzene, toluene, ethylbenzene, o-, m-and p-xylene by mixed bacteria, which were enriched from activated sludge of petrochemical wastewater treatment plant, under aerobic condition. When the concentration of the tested compounds were 50-140 mg/L, the six tested compounds can be biodegrade. Seventeen bacteria strains were sifted from the mixed bacteria, they can biodegrade toluene,ethylbenzene, trimethybenzene, o-, m-and p-xylene.The ratio of o-and m-xylene were 100% by sifting bacteria. The results indicated that the biodegradability of the compounds strongly depends on its chemical component and structure. At the test system, the biodegradable order of the six tested compounds was:toluene, p-xylene,m-xylene, ethylbenzene, benzene and o-xylene. The intermediates of toluene degraded were detected and was pathway for toluene degraded at aerobic condition.