TY - Front. Environ. Sci. Eng. A1 - LIU Hong, YAN Yixin, WANG Wenyan, YU Yongyong T1 - Low intensity ultrasound stimulates biological activity of aerobic activated sludge Y1 - 2007-03-05 JF - Frontiers of Environmental Science & Engineering JO - Front. Environ. Sci. Eng. SP - 67 EP - 72 VL - 1 IS - 1 UR - https://journal.hep.com.cn/fese N1 - 10.1007/s11783-007-0013-5 ER -