SBR法交替缺氧好氧模式下短程硝化效率的优化

采用SBR法以实际生活污水为研究对象,通过交替缺氧好氧的运行模式实现了短程硝化的快速启动.在不同的缺/好氧时间比条件下考察了短程硝化的启动时间、污染物处理效果以及氨利用速率的变化.结果表明,在缺氧/好氧时间比为1:1和2:1条件下,分别用了31,55d使得两系统的亚硝酸盐积累率达到90%,短程状态稳定.氨氮去除率达到95%以上,COD出水在50mg/L以下,总氮去除率提高20%,污染物的去除效率有所提高.由全程到短程的转变期间,系统氨利用速率分别提高了67.5%和89.8%,同时提高了短程硝化的效率.期间,污泥沉降性较好,污泥容积指数稳定在60~80mL/g.

Optimization of efficiency on partial nitrification under the mode of alternating anoxic/oxic in sequencing batch reactor

Using Sequencing Batch Reactor (SBR) treating domestic wastewater, quick start of partial nitrification was carried out through the mode of alternating anoxic/oxic. Time of achieved partial nitrification, treatment efficiency and ammonia utilization rate were investigated in different ratio of anoxic/oxic time. The results showed that the ratio of anoxic/oxic time was 1:1and 2:1, while two systems nitrite accumulation rate raised to 90% after 31days and 55days respectively, the state of partial nitrification was stable. Besides, ammonia removal efficiency was attained above 95% and the COD effluent concentration was less than 50mg/L. The total nitrogen removal was enhanced about 20%, and pollutants removal efficiency was increased. Form the complete nitrification to the partial nitrification, ammonia utilization rate increased 67.5% and 89.8% respectively, at the same time, efficiency of the partial nitrification was improved. Meanwhile, sludge had significantly better settling performance, sludge volume index was stable at 60~80mL/g.