Research on treatment of coking wastewater with New zinc aluminum compound flocculant

For solving CODCr excessive of coking wastewater from secondary setting tank,the new zinc aluminum compound flocculant(ZACF)was prepared with inorganic zinc,inorganic aluminum and polyacrylamide,and its application to the treatment of coking wastewater from secondary setting tank was conducted.The effects of pH,temperature,dosage and stirring speed on the removal of contaminants were investigated.The results indicated that when the pH,dosage and stirring speed were controlled at 10,1.2mL·L-1 and 75r/min respectively,the removal rates of CODCr and turbidity,reach76% and 98.1%,respectively,and the effect of temperature on the flocculation was little.Furthermore,the flocculation performance of zinc aluminum compound flocculant(ZACF)was better than those of polyferric sulfate(PFS)and polyaluminum chloride(PAC).