Regulation of DO and pH value of the aeration tank,using a homogeneous adjusting tank and controlling its level,properly adding a nutrient salt are the main measures for controlling the floating upward of the activated sludge.是什么意思_Regulation of DO and pH value of the aeration tank,using a homogeneous adjusting tank and controlling its level,properly adding a nutrient salt are the main measures for controlling the floating upward of the activated sludge.在线翻译_英语_读音_用法_例句