Activated carbon-enhanced coagulation for treatment of textile wastewater at low temperature

In response to the unsatisfactory result of textile wastewater treated by coagulation alone at low temperature,this study analyzed the best dosages of three coagulants and investigated the effect of the addition way of coagulants on the coagulation,as well as the treatment effect of coagulation-activated carbon at low temperature on textile wastewater.The results showed that at normal temperature(20-30 ℃),the effect of basic alumiump chloride(BAC) was the best,the removal of CODCr,chromaticity and TP by BAC were 51.44%,70.00% and 93.48%,respectively,when its concentration was 100 mg/L.In comparison,the corresponding values were 31.60%,50.00% and 75.36% at low temperature(10-15 ℃).When the coagulation-activated carbon combined process was used and 20 mg/L activated carbon was added before PAC,the removal of CODCr was up to 73.80%.