Abstract:

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 pH, gas velocity, mass concentration of CBS, height ratio of foam phase to liquid phase (H_F/H_L), 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 H_F/H_L 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.

Key words: collagen-peptide, surfactants, dye wastewater, foam, separation

摘要：

以结晶紫溶液模拟染料废水,研究了胶原多肽基表面活性剂(CBS)对染料废水的泡沫分离性能。通过单因素实验考察了pH、气速、表面活性剂质量浓度、泡沫相与液相高度比(H_F/H_L)、染料初始浓度、乙醇添加量等因素对废水中染料分离的影响。结果表明,CBS适用于碱性条件下染料废水的泡沫分离;随着气速的升高,染料的去除率增加,但富集比降低;随着CBS用量的增加,染料的去除率先增加而后降低,富集比随CBS用量的增加而降低;当泡沫相高度与液相高度比为3左右时,染料去除率较高;添加适量的乙醇对泡沫分离是有利的;在较佳的分离条件下,染料的去除率可达80%,富集比达到16。上述研究结果表明,胶原多肽基表面活性剂可用于染料废水的泡沫分离。

关键词: 胶原多肽, 表面活性剂, 染料废水, 泡沫, 分离