超声破解污泥上清液对A~2O工艺脱氮除磷和微生物群落结构的影响

为了提高传统污水处理工艺的脱氮除磷效率、实现污泥资源化,本实验通过超声破解污泥获取碳源,采用耗氧呼吸速率分析上清液作为碳源的可行性,并将上清液回用于生活污水,考察其对A2O工艺长期运行的脱氮除磷效果和微生物群落结构的影响。结果表明,上清液中可降解有机物达到76.2%,具有作为内碳源的潜能;上清液和生活污水按1∶15投入A2O反应器后,氮、磷的去除率分别从63.2%和53.4%提高到了82.1%和94.7%;上清液明显改变了微生物群落结构,使除磷菌Actinobacteia和反硝化聚磷菌Sphingobacterium富集。

Effects of ultrasonic-disintegrated sludge supernatant on nutrient removal performances and microbial community structure in A2O process

To improve the nutrient removal efficiency and accomplish sludge recycling, ultrasonic pretreatment was used to obtain carbon source from waste activated sludge. The feasibility of ultrasonic disintegrated sludge supernatant as internal carbon source was analyzed by oxygen uptake rate, and the long-term nutrient removal performances and microbial community structure in anaerobic-anoxic-aerobic (A²O) system were observed at the supernatant and domestic wastewater ratio of 1:15. The experimental results demonstrated that the proportion of degradable organics in supernatant reached 76.2%, indicating the potential of supernatant as internal carbon source. It is also observed that total nitrogen and total phosphorus removal efficiency increased from 63.2% and 53.4% to 82.1% and 94.7%, and Actinobacteia and Sphingobacterium became more intense and were responsible for the nutrient removal after supernatant addition.