摘要
采用均质硅橡胶膜构建了卷绕式膜组件,以盐酸溶液为萃取液回收浓缩废水中的邻甲苯胺。通过考察进水浓度、萃取液pH、温度、离子强度、进水流速等因素对去除过程及回收率的影响,探讨了采用膜萃取技术回收浓缩邻甲苯胺的条件与机制。结果表明：膜萃取技术可以将2 g/L的邻甲苯胺废水浓缩至约10 g/L,且随着料液浓度增加,邻甲苯胺回收率先增后降,过高的邻甲苯胺浓度可能会造成膜选择性下降;萃取液pH是影响回收率的重要因素之一,1≤pH≤2时污染物回收率高于95%;无机盐离子可以促进邻甲苯胺的回收,当盐离子含量超过10%时,回收率显著提高;进水流速在2-20m L/min之间变化时,回收率先增后降,膜阻和解吸速率依次成为主要影响因素。该实验研究表明,膜萃取技术可以高效节能地的浓缩回收生产废水中的邻甲苯胺。
A module of single tubular nonporous silicone rubber membranes and HCl stripping solution were employed for extracting o-toluidine from wastewater. The effects of o-toluidine feed concentration,pH of the extraction solution,system temperature,ionic strength,and flow status on the permeability（ P） and removal efficiency（ η） were investigated to illustrate the process parameters and mechanism of o-toluidine recovery from wastewater by silicone rubber membranes. The experimental results indicated that membrane extraction can enrich the feed concentration from approximately 2 to 10 g / L,and that the feed concentration of o-toluidine has little effect on the recovery efficiency within a certain range. The pollutant permeability efficiency was nearly 95%when the pH of the extraction solution was 2 or less. Inorganic ions can promote the recovery of o-toluidine.When the salting strength was over 10%,the recovery efficiency increased quickly to some extent. The permeability,which was influenced mainly by membrane resistance and desorption rate,initially increased and then decreased when the water flow was changed between 2 and 20 m L / min. This study demonstrated that membrane extraction was a highly energy-efficient process for the effective recovery of o-toluidine from production wastewater.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第3期1241-1246,共6页
Chinese Journal of Environmental Engineering
基金
陕西省科技统筹创新项目(2013KTCL14)
陕西省自然科学基金资助项目(2015JM4127)
关键词
邻甲苯胺
回收
膜萃取
均质硅橡胶膜
o-toluidine
recovery
membrane extraction
silicone rubber membrane
