STUDY ON THE ADVANCED TREATMENT OF MINING AREA'S DOMESTIC SEWAGE BY MICRO-FLOCCULATION CONTINUOUS SAND FILTRATION

Micro-flocculation Continuous sand filtration were used to treat mining area's domestic sewage,this study investigated the effect of filter material'size,sand filter's depth;filtering velocity;sand circulation velocity as well as medicament dose on the SS removal.The results indicated that when the filter material'size was bout 0.8～1.0 mm;the depth of sand filter was about 1.0～1.2 m;sand circulation velocity was about 2～4 mm/min;PAC dose was about 20～25 mg/L,the effluent'SS was less than 5 mg/L,the removal rate arrived at 94.5%.