A past of high NH4(superscript +)-N source water not biological treated was fed into BAC filter after conventional treatment to enhance the NH4 (superscript +)-N concentration of BAC filter influent water.

• 将一部分未经生物预处理的高氨氮原水经常规处理后进入生物活性炭滤池以提高活性炭滤池进水氨氮浓度。