The Mechanisms of Coagulation with Newly-formed Ferric
A new coagulant was synthesized by oxidizing Fell with H2O2 instantaneously. Key parameters in the preparation of the coagulant including aging time, acid volume, and n(H2O2)/n(Fe) were investigated through jar tests. The optimized coagulant was then compared with Fe2(SO4)3 and PFS (poly-ferric sulphate) in residual turbidity, UV254, Zeta potential to evaluate its coagulation efficiency and infer the reaction mechanism. Aging time has little effect on coaulation efficiency. The optimized acid volume was 0.1 mol · L-1. Coagulation efficiency increased with n(H2O2)/n(Fe). 0.55 is the most economical and efficient molar ratio. The removal efficiency of turbidity of the newly-formed ferric is similar to Fe2(SO4)3 or PFS. The removal efficiency of UV254 by newlyformed ferric is higher than that by Fe2(SO4)3 by 20％ ~ 44％. The Zeta potential of supernatant after being treated by newly-formed ferric gradually increased to 0 mV with increasing coagulant dosage, indicating strong effect of charge neutralization.The newly-formed ferric is a promising new coagulant with extremely short aging time, cost lower than Fe2(SO4)3 or PFS by more than 50％, and high removal efficiency of UV254 absorbance.
newly-formed ferric H2O2 cost aging UV254
QIAO Junlian YANG Xue GUAN Xiao-hong
College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China Department of Municipal and Environmental Engineering, Harbin Institute of technology, Harbin 150090
国际会议
三峡
英文
434-441
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）