Studies on the treatment of toxic phenols wastewater in coke plant with fly ash treated by acid
XIA Chang bin, HE Xiang zhu, LI De liang (Institute of Environmental Engineering and Chemical Hi technology Xiangtan Polytechnic University, Xiangtan 411201,China)
A coal fly ash based coagulant combining the capabilities of both physical adsorption and chemical coagulation has been prepared treated by adding a small amount of pyrite slag and an appropriate amount of NaCl to coal fly ash in coal fired thermal power plants and then the resulting mixture being stirred and extracted with dilute H 2SO 4 for 2.5 h at 100 ℃. This coagulant thus was used to treat toxic phenols wastewater in coke plant, the removing rate of SS, COD, color and phenols was 95%, 86%, 96% and 92% respectively, a higher rate of settlement, a smaller volume of sludge, and a lower cost of treatment. The coagulation mechanism of fly ash coagulant in the treatment of toxic phenols wastewater in coke plant has been studied.
【CateGory Index】： X784