Study on the Pellet Coagulation Process in Treating Coal-Washing Wastew ater

Experiments were conducted to study pellet coagulation process in treating coal washing wastewa-ter.The rules of the influences of flocculant PAC,promoter PAM,upflow r ate U W and compulsory stirring rotation speed n on the pellet coagulation process wa s found.Concluded from the experime nts,applicable values for the above-mentioned substances and parameters areρ(PAC)=1.78～3.00mg /L,ρ(PAM)=1.10～2.90mg /L,U W =30～50cm /min,n=40～80r /min.