膜吸收法应用于氨氮废水净化的研究

Study on the treatment of ammonia nitrogen wastewater by membrane absorption process

在去除废水里氨氮的3种膜吸收方式中,吸收式膜吸收法能在最短时间内将水中氨氮降至较低水平.因此,它被认为是最有效的方法.研究表明,废水的pH是影响传质系数的最主要因素;氨氮浓度对膜通量影响较大,氨氮浓度越高,氨的膜通量越大;废水中氨氮或盐量较高时,能有效抑制水的渗透蒸馏通量,减弱对吸收液的稀释作用.通过运用吸收式膜吸收法对以无机污染物为主的高氨氮废水和以有机污染物为主的剩余氨水处理效果作对比研究,进而得出以下结论:膜吸收法适用于处理含盐量较高、中温、油性污染物含量较低的高氨氮废水.最后还初步探讨了膜的污染和再生情况.

Among three membrane absorption ways of removing ammonia nitrogen from wastewater, one with the absorbent solution that can reduce the ammonia nitrogen obviously in the short time is considered to be the most effective. The result indicates that pH of wastewater is important one of main factors which influence on mass transfer coefficient of membrane absorption process. The concentration of ammonia nitrogen affects the membrane flux significantly（ the higher the concentration of ammonia nitrogen is, the greater the membrane flux is）;The high ammonia salt and concentration in the feed can decrease the flux of osmosis distillation and weaken the dilution of absorbent solution. The experimental results show that the membrane absorption process is suitable for treating high salt, middle temperature and lower oily wastewater.