酸改性粉煤灰处理焦化废水的工艺研究

研究了粉煤灰与少量的硫酸烧渣和适量的固体NaCl混合 ,将混合物在加热条件下用稀硫酸处理 ,制得集物理吸附和化学混凝为一体的混凝剂。这种混凝剂与无机高分子絮凝剂PSA配合用于焦化废水的处理 ,SS、CODCr、色度和酚的去除率分别为 95 %、86 %、96 %和 92 %。混凝沉降速度快 ,污泥体积小 ,处理费用低 ,结合显微照片探讨了酸浸粉煤灰混凝剂对含酚废水的混凝沉降机理

STUDIES ON THE TREATMENT OF WASTEWATER IN COKE PLANT WITH FLY ASH TREATED BY ACID

A fly ash|based coagulant combining the capabilities of both physical adsorption and chemical coagulation has been prepared 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 a dilute H-2SO-4 for 2.5 h at 100℃.This coagulant was used to treat toxic phenols wastewater in a coke plant,the removal rates of SS,COD Cr ,colority and phenol were 95%,86%,96% and 92% respectively,which featured 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 the coke plant has been studied.