TY - Front. Environ. Sci. Eng. A1 - Siqi Li, Min Zheng, Shuang Wu, Yu Xue, Yanchen Liu, Chengwen Wang, Xia Huang T1 - The impact of ultrasonic treatment on activity of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in activated sludge Y1 - 2019-12-15 JF - Frontiers of Environmental Science & Engineering JO - Front. Environ. Sci. Eng. SP - 82 EP - VL - 13 IS - 6 UR - https://academic.hep.com.cn/fese N1 - 10.1007/s11783-019-1166-8 ER -