污水处理工艺对微藻及藻际细菌群落的影响

Influences of sewage treatments technologies on microalgae and bacteria community structures

以某啤酒厂活性污泥作为接种物富集对污水有降解作用的微藻与细菌,探讨藻菌共生体在经过不同处理的污水培养基中生长情况及藻菌群落结构的变化.微藻在两个处理组Treat. 1(过滤且灭菌污水)和Treat. 2(过滤未灭菌污水)中均生长良好;培养20d后,微藻和细菌在不同污水处理组中群落结构与原样相比,发生了显著的变化:随着藻菌在污水培养基中生长,莱茵衣藻和小球藻在Treat. 1和Treat. 2中成为优势藻类;无色杆菌属unidentified OPB35的相对丰度在两组实验组中均明显增加,溶杆菌在Treat. 1和Treat. 2中显著减少.藻菌共生体对Treat. 1和Treat. 2中的化学需氧量(COD)去除率可达到73.7%和67.9%.结果表明,Treat.1和Treat.2中的污水培养基对微藻及细菌的群落结构有显著的影响,但不同处理组中不同藻菌共生体对培养液的CODCr去除无明显的区别.

Microalgae and bacteria communities related to sewage treatments were cultured with activated sludge from a brewery.And then,they were used to treat sewage from the brewery under two experimental conditions:Treatment 1(Filtered and sterilized sewage)and Treatment 2(filtered but unsterilized sewage).Compositions of microalgae and bacteria communities were analyzed during the experiments.After 20 days incubation,microbial community structures notably changed in all treatments.Chlamydomonas rhinella and Chlorella sp.became dominant bacteria communities in Treatment 1and Treatment 2,and the abundances of unidentified OPB35increased significantly.But Lysobacterium decreased significantly in two treatments.The removal rates of chemical oxygen demand(COD)in Treat.1and Treat.2were 73.7%and 67.2%,respectively.What is more,microalgae grew well in the two treatments.Results showed that microalgae communities significantly influenced bacteria community compositions in Treat.1and Treat.2and there were no significantly differences in the removal efficiencies of CODCr in two treatments.