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  一級處理,主要去除污水中呈懸浮狀態的固體污染物質,物理處理法大部分只能完成一級處理的要求。經過一級處理后的污水, BOD 一般可去除 30% 左右,達不到排放標準。一級處理屬于二級處理的預處理;

  二級處理,主要去除污水中呈膠體和溶解狀態的有機污染物質( BOD 、 COD ),去除率可達 90% 以上,使有機污染物達到排放標準;

  三級處理,是在一級、二級處理后,進一步處理難降解的有機物、磷和氮等能夠導致水體富營養化的可溶性無機物等。主要方法有生物脫氮除磷法,混凝沉淀法,砂濾法,活性炭吸附法,離子交換法和電滲析法等。

廢水去除率
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