Decolorization and COD removal of yeast wastewater by coagulation process using poly-aluminum chloride
An experimental study was conducted to test the effectiveness of coagulation using polyaluminum chloride (PAC) to reduce the color and COD of the secondary effluent of yeast wastewater. The coagulant dose, pH and mixing condition of coagulation were optimized. Polyacrylamide (PAM) as coagulant aids for coagulation performance was also studied. The optimal conditions corresponded to pH 6 and a dose of PAC of 6 g/l with 69.8％ COD removal and 91.7％ color removal. The recommended dose, however, is 4 g/l at pH of 6, with 68.7％ COD removal and 90.35％ color removal, which is cheaper in practical use. The mechanism of coagulation with PAC is discussed. Sweep coagulation is proposed as the dominant mechanism according to zeta potential measurement.
Y.Zhou Y.Wang Z.Liang
School of Environmental Studies and MOE Key Laboratory of Biogeology and Environmental Geology, China;University of Geosciences, Wuhan, China
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
1651-1654
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）