曝气生物滤池处理生活污水效能沿滤层高度的变化

采用曝气生物滤池处理生活污水,研究水中污染物沿滤层高度变化情况,以确定曝气生物滤池去除各污染物的有效滤层高度。研究结果表明,曝气生物滤池可有效处理生活污水。在二级滤池、滤层总高度4 m、滤速5.0 m/h条件下,出水COD、氨氮和总磷均能达到城镇污水处理厂综合排放标准。滤池总去除率,COD 90.39%,氨氮71.14%,总磷95.46%。曝气生物滤池去除COD主要在滤层0~2.6 m段,去除率75%,占总去除率的82.9%;去除氨氮主要在2.6~4.0 m段,去除率49.50%,占总去除率的69.6%;去除总磷主要在1.2~2.6段,去除率61.78%,占总去除率的64.7%。用曝气生物滤池处理生活污水,要达到《城镇污水处理厂综合排放标准》,滤层高度应在4 m左右。

Effect of changes of biological aerated filter treating domestic wastewater through filter layer

Domestic wastewater was treated by biological aerated filter(BAF).The index of the domestic wastewater could be up to Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant by a two-stage BAF with 4 m in depth and filtering at 5 m per hour.The removed rate of COD was 90.39%,nitrogen was 71.14% and total phosphor was 95.46%.The COD was removed by 75% in the layer from 0 to 2.6 m highness,nitrogen by 49.50% from 2.6 to 4.0 m highness and total phosphor by 61.78% from 1.2 to 2.6 m highness.The layer depth of BAF should be more than 4 m for domestic wastewater treatment.