Application of chemical coagulation for removal of anionic surfactants in detergent wastewater

摘要

The present study iS to investigate the treatment of surfactant wastewater by a bench scale physical-chemical treatment.Experiments were conducted to examine the effects of pH and amount of coagulant on the surfactant removal.The result of the wastewater characterization showed that the concentration of the organic matter were high,expressed as COD,in the range of 4920mg/L.while the biodegradable portion Was low.These values indicate that organic compounds are not easily subjected to biological treatment.In addition,methylene blue active substance appeared high concentration as well as total solids and turbidity.The experiments for the treatment of the wastewater were performed usingvarious chemicals such as lime,alum and ferric chloride.The use of lime gave 21％and 17％.COD and MBAS removal,while by using alum a slightly higher was achieved,37％and 28％,respectively.The Use of ferric chloride led to a 89％COD removal and a 80％surfactant removal.