膜萃取处理高浓度含苯胺废水

Highly concentrated aniline-loaded wastewater treatment with membrane extraction

实验采用橡胶膜作为分离膜处理高浓度含苯胺废水。考察了废水初始浓度、水力条件、操作温度、萃取液pH值及离子强度等因素对苯胺去除效果及总传质系数的影响及该工艺对大连绿源药业公司工业废水处理的效果。实验发现该传质过程主要受膜阻控制;渗透系数与温度之间符合范霍夫–阿伦尼乌斯方程;离子强度改变了苯胺在相间的分配系数,影响传质过程;在流速3.05L/d、温度50℃、pH值约等于1、膜管长18m条件下,实际工业苯胺废水进水浓度为33081mg/L时,苯胺的去除率基本维持在97%以上,单位废水净收益为103.84元/吨。

The highly concentrated aniline wastewater was treated by membrane extraction. The effects of the aniline initial concentration, hydrodynamic conditions, temperature, pH value and ionic strength on removal efficiency and mass transfer coefficient were investigated. The experimental results showed that the overall mass transfer resistance was dominated by membrane resistance. The relationship between temperature and the permeability of aniline agreed with the Arrhenius equation. The ionic strength influenced the partition coefficients in aqueous-membrane-aqueous systems. The aniline removal efficiency was up to 97% under the conditions of flow rate 3.05 L/d, temperature 50℃, pH 1, membrane length 18 m and initial aniline concentration 33 081 mg/L. The net benefit was 103.84￥ per ton.