小球藻—芽孢杆菌共生体系处理污水的研究

Study on wastewater treatment by Chlorella-Bacillus symbiosis system

为提高微藻处理污水的效率,将具有污水处理能力的小球藻,与从垃圾渗滤液中分离的两株芽孢杆菌SL1和SL2,分别构建小球藻-芽孢杆菌的藻菌共生体系:小球藻-芽孢杆菌SL1和小球藻-芽孢杆菌SL2,并将其应用于垃圾渗滤液配制污水的处理.结果显示,小球藻能够适应于所配制的高营养盐污水;芽孢杆菌SL2可以促进小球藻生长;无菌的小球藻对TN、NH4+-N、TP和CODCr的去除效率分别为45.7%,45.0%,37.9%和76.7%;而小球藻-芽孢杆菌SL1对TN、NH4+-N和TP的去除效率分别为92.0%,92.0%和81.3%;小球藻-芽孢杆菌SL2对TN,NH4+-N,TP和CODCr的去除效率为76.0%,72.0%,85.3%和94.3%.结果暗示,小球藻-芽孢杆菌共生体系比单纯微藻能更好去除垃圾渗滤液所配制的污水中氮、磷和CODCr,芽孢杆菌SL2可以促进小球藻的生长,在污水处理行业具有一定的应用潜力.

Low efficiency of microalgae wastewater treatment limits its application and development.In this study,a green alga Chlorellasp.and two strains of Bacillussp.SL1 and Bacillussp.SL2 isolated from landfill leachate were set up to two symbiotic systems:Chlorella-Bacillus SL1 and Chlorella-Bacillus SL2.The two symbiotic systems were used to purify wastewater made from landfill leachate.The results showed that Chlorella could adapt to the wastewater with high nutrient,that Bacillus SL2 could promote the growth of Chlorella,that total nitrogen(TN),NH4+-N,total phosphorus(TP)and chemical oxygen demand(CODCr)were removed with 45.7%,45.0%,37.9%and 76.7%by Chlorella respectively,that the removal efficiency of TN,NH4+-N and TP was92.0%,92.0%and 81.3%by Chlorella-Bacillus SL1,respectively,and that the removal efficiency of TN,NH4+-N,TP and CODCrby Chlorella-Bacillus SL2 was 76%,72%,85.3%and 93.7%,respectively.The present results indicates that Chlorella-Bacillus symbiotic systems have good removal efficiencies of TN,NH4+-N,TP and CODCr,and Chlorella-BacillusSL2 symbiotic system have potential application in the wastewater treatment.