Donnan渗析分离含盐废水中的氨氮

Separation of ammonia nitrogen from salt-containing wastewater by Donnan dialysis

通过Donnan渗析去除含盐废水中的氨氮,研究了盐水初始浓度、NaCl与氨氮比例、搅拌强度以及温度等对氨氮分离的影响。结果表明,降低盐水浓度、NaCl与氨氮比可提高氨氮的去除率,搅拌速度由200 r/min提高到500 r/min时,氨氮的去除率从49.6%提高到54.3%,处理时间缩短。适当提高温度,可有效提高氨氮的分离效果。

The removal of ammonia nitrogen from salt-containing wastewater by Donnan dialysis has been studied. The effects of initial salt concentration,concentration ratio of Na Cl to NH4＋,stirring intensity and temperature on ammonia nitrogen separation were investigated. The results showed that the removal efficiency of ammonia nitrogen was improved with the reduction of initial salt concentration and concentration ratio of Na Cl to NH4＋. When the stirring intensity increased from 200 r/min up to 500 r/min,the separation efficiency increased from 49. 6% to 54. 3%,and the processing time was shortened. Moderately increasing the temperature could improve the removal rate of ammonia nitrogen.