| Fly ash is modified by macromolecular flocculant PDMDAAC,and the decolourization test for dyeing wastewater is carried out by chemical coagulation with modified fly ash,fly ash,PDMDAAC.The results show that the efficiency of fly ash modified by PDMDAAC for color removal of wastewater is greater than fly ash,PDMAAC.The discoloring rate can reach up to 87.4% under the optimal conditions. |