驯化筛选微生物对油制气废水的降解特性

从5个菌源分离到的16株菌中筛选出S－2、Y－3和XH－3为优势菌种,分别用它们及其混合菌M－3研究对油制气废水的降解,60h之后CODcr的去除率为38．4％－44．0％,酚类化合物的去除率为95．4％－97．0％,芳烃类化合物的去除率为47．1％－53．7％,但氨氮的去除率只有14．0％－17．6％。采用GC／MS分析了处理前后废水中的芳烃类化合物,所筛选的微生物对芳环数≤3的芳烃类化合物降解能力强,还可去除一定量芳环数为4－6的芳烃类化合物。加入共代谢基质葡萄糖,可使CODcr、氨氮及可萃取有机物的去除率分别提高13．1％－22．9％、18．4％－22．7％及13．1％－18．1％;加入乙醇,可使CODcr、氨氮及可萃取有机物的去除率分别提高12．5％－21．2％、29．7％－42．2％及6．7％－7．7％。废水中芳烃类化合物的总去除率分别比无葡萄糖和无乙醇时提高了17．7％－21．7％和15．4％－21．2％。所筛选驯化的菌种有效地提高了油制气废水的降解效率。

Biodegraded characteristics of MGP-wastewater by domestic and screened organisms

Among 16 bacteria that were screened out from 5 activated sludge, S-2, Y-3, XH-3 and their mixed strains M-3 were selected to biodegrade MGP (Manufacture gas from petroleum)-wastewater. They can remove 38.4%-44.0% CODCr, 95.4%-97.0% hydroxybenzene and 47.1%-53.7% aromatic compound after 60 h treatment, but the removal rate of NH4(+)-N was only 14.0%-17.6%. About 77 toxic organic compounds were detected by GC/MS analysis, the aromatic compounds which had 3 rings and 4-6 rings can be biodegraded by the bacteria. The removal rate of CODCr, NH4(+)-N and extractable organic compound were improved 13.1%-22.9%, 18.4%-22.7% and 13.1%-18.1% respectively when glucose was added in the wastewater, and when ethanol was existing in the wastewater, the corresponding increase were 12.5%-21.2%, 29.7%-42.2% and 6.7%-7.7%. The total removal rates of aromatic compound were increased 17.7%-21.7%, 15.4%-21.2%. The screened strains can improve the biodegradation rate of MGP-wastewater.