SBR工艺短程硝化快速启动条件的优化

以低COD/TN的实际生活污水为研究对象,采用SBR反应器,对短程硝化的启动条件进行了优化.结果表明,温度30℃、溶解氧(DO) 2.0mg/L、污泥龄为7d时,系统在实时控制条件下运行32周期,可以成功启动短程硝化.在总氮(TN)去除率>95%的情况下,亚硝酸盐积累率(NO2--N /NOx--N)>90%,随后的64d,温度恢复到常温(20~24℃),系统仍稳定运行.荧光原位杂交技术(FISH)检测表明,经过32个周期种群优化,污泥中氨氧化菌(AOB)的含量提高了38.9%,亚硝酸盐氧化菌(NOB)的含量降低了53.2%.在线动态控制DO浓度和曝气时间可以逐渐淘汰系统中的NOB,从而获得稳定的短程硝化,提高系统脱氮效率.

Factors optimization of rapid start-up for partial nitrification in SBR process

Factors of rapid start-up for partial nitrification were investigated in the sequencing batch reactor (SBR) treating real domestic wastewater with low COD/TN ratio. It was concluded that the optimal conditions consisted of temperature 30℃, dissolved oxygen (DO) 2.0mg/L and sludge retention time(SRT) 7 days. Partial nitrification to nitrite was achieved under real-time control in 32 cycles. The nitrite accumulation rate (NO2--N/NOx--N) was over 90% when the TN elimination efficiency was above 95%. In the subsequent 64 days, the system was also successfully operated at room temperature (20~24℃). Fluorescent in-situ hybridization (FISH) analysis showed that the population of ammonia oxidizing bacteria (AOB) increased by 38.9% while nitrite oxidizing bacteria(NOB) decreased by 53.2% after 32 cycles. NOB could be gradually washed out by the online control of DO and aerobic duration, so steady partial nitrification and nitrogen removal efficiency could be achieved and enhanced, respectively.