Abstract
The effect of various surfactants used in textile dyeing processes on coagulation treatment of dying wastewater was investigated. When alum was used as a coagulant, the color removal rate of milling-type acid dyes was significantly decreased by the presence of nonionic surfactants. The combined use of inorganic and organic coagulants achieved an excellent color removal rate of more than 95% for the most of acid dyes tested in this study. In the combined coagulants treatment, nonylphenol ether nonionic surfactants and anionic surfactants had no significant effect on the color removal efficiency. However, poly(oxyethylene) alkylamine nonionic surfactants decreased remarkably the color removal rate. The decrease of the color removal rate was more severe by the surfactant having smaller number of ethylene oxide group.
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