基因工程菌生物强化MBR工艺处理阿特拉津试验研究

以生活污水为共基质,考察了基因工程菌在MBR和活性污泥反应器中对阿特拉津的生物强化处理效果,以及生物强化处理对污泥性状的影响.结果表明,基因工程菌在MBR中对阿特拉津具有很好的生物强化处理效果,阿特拉津平均出水浓度为0.84 mg/L,平均去除率为95%,最大去除负荷可以达到70 mg/(L·d).生物强化的MBR对生活污水中COD的平均去除率为71%,COD平均出水浓度65 mg/L,COD容积负荷增加对COD去除效果有一定影响;对生活污水中的氨氮具有很好的去除效果,氨氮平均出水浓度为1.1 mg/L,平均去除率为97%,最大氨氮去除负荷为143 mg/(L·d).与普通MBR污泥相比,生物强化MBR污泥的硝化活性和亚硝化活性略高,碳氧化活性略低,因此表现出氨氮处理效果很好,COD处理效果略差.阿特拉津的存在会对污泥性状产生影响,可能是造成污泥碳氧化活性低的原因.

Bioaugmentation Treatment of Atrazine in MBR Using Genetically Engineered Microorganism (GEM)

Bioaugmentation treatment of atrazine by genetically engineered microorganism (GEM) in membrane bioreactor (MBR) and conventional activated sludge bioreactor (CAS), was investigated using domestic wastewater as co-substrate, and effects of bioaugmentation treatment on sludge activities were also discussed. The results showed that significant removal of atrazine was obtained in MBR with bioaugmentation: average atrazine concentration in effluent was 0.84 mg/L, average removal rate was 95%, and the maximum removal loading of atrazine was as high as 70 mg/(L·d). Average COD removal in MBR was 71%, and average COD concentration in effluent was 65 mg/L. However, COD removal was affected when volumetric loading of COD increased. NH₃-N removal in MBR was also perfect: average NH₃-N concentration in effluent was 1.1 mg/L, average removal rate was 97%, and the maximum removal loading of NH₃-N was 143 mg/(L·d). Compared with sludge in common MBR, abilities of nitrification and nitrozation of sludge in bioaugmented MBR were higher but ability of carbon oxidation was lower, which was responsible for performance of COD and NH₃-N removal probably. Exposure to atrazine resulted in some negative effects on activated sludge and might be the reason for lower carbon oxidation ability of bioaugmented sludge.