高浓度有机废水酵母菌低氧处理技术初探

在开放式环境中,在低氧条件(DO=0-0.2mg/L)下通过连续小试试验考察了利用酵母Candidatropicalis处理高浓度有机废水的可行性。54d低氧连续小试结果表明:进水COD、NH4+-N、TP浓度分别为11000～30000、1000、230mg/L时,其去除率分别为67%～88%,18%～68%,23%～68%,氮磷去除率取决于进水COD、TN、TP的水平。污泥微观形态观察表明反应柱内微生物基本上是酵母,但运行过程中优势酵母形态发生了变化。低氧(DO=0.1-0.4mg/L)和无氧条件下C.tropicalis批量培养试验表明污染物去除和酵母生长与氧的供给关系密切,低氧条件下C.tropicalis有很高的活性,能有效去除COD(去除率为91%);无氧条件则导致C.tropicalis生物量下降,COD去除率仅为12%。

Yeast Microaerobic Treatment of High-strength Organic Wastewater

The study demonstrated the feasibility of treatment of high-strength organic effluents at low DO level of 0～0.2mg/L using a chosen yeast species,Candida tropicalis,by both batch mode and a 54 day laboratory scale continuous running in open treatment system.Results showed that average COD,NH4+-N and TP removals of 67%～88%,18%～68%,23%～68% occurred at influent COD,NH4+-N and TP levels of 11,000～30,000,1000 and 230mg/L respectively.Influent COD,TN,TP levels played an important role in TN/TP removals.Microscopic observations showed no bacterial or mold contaminants in reaction column were observed over the experimental period and the microscopic morphology of dominant yeast varied.Batch experiments showed oxygen supply had an important effect on yeast growth and COD removal.Microorganism grew well while COD removals were 91% at DO level of 0.1～0.4mg/L,and COD removal was only 12% following with the decrease of MLSS level without oxygen supply.