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Foam separation behaviors of collagen-peptide based surfactant for treatment of dye wastewater

Foam separation behaviors of the collagen-peptide based surfactant(CBS) for dye removal from wastewater was studied using crystal violet solution as probe. The influences of p H, gas velocity, mass concentration of CBS, height ratio of foam phase to liquid phase(HF/HL), initial concentration of dye and concentration of ethanol on the removal extent of dye were investigated. The experimental results indicated that CBS exhibited good performance at alkaline condition. It was also found that the removal extent of dye was increased as the increase of gas velocity, but the enrichment ratio of dye was decreased. With increasing dosage of CBS, the removal extent of dye was increased at beginning and then decreased as further increasing the dosage of CBS, while the enrichment ratio was decreased all the time. Further investigation indicated that the removal extent of dye was superior when the HF/HL was around 3, and the appropriate amount of addition of ethanol was beneficial to foam separation. In addition, the removal extent of dye was 80% and the enrichment ratio of dye was 16 at optimal operation conditions. These results suggested that CBS can be used in the foam separation removal of dyes from wastewater.