Effect of pH on the Ammonia-nitrogen Removal Rate by Chemical Precipitation

摘要：

The effect of pH on ammonia nitrogen removal rate was studied theoretically and experimentally by chemical precipitation with MgCl<,2>·6H<,2>O and Na<,2>HPO <,4>·12H<,2>O as precipitator and with simulative wastewater and coking wastewater after ammonia still. The theoretical calculation shows that the optimal pH is 8.89 by chemical precipitation, which has nothing to do with initial concentration of ammonia nitrogen. The results show that, for the simulative wastewater, when pH=9.0 and the mol ratio of PO<3-><,4>/NH<,4 +>/Mg<2>+ is 1.3/1/1.2, the removal rate of ammonia nitrogen is maximal (97.3％), the ammonia nitrogen concentration decreases from 592.8 mg/L to 15.8 mg/L. For the coking wastewater after distillation with ammonia nitrogen concentration of 851.6mg/L, at condition of pH=9.0 and the mol ratio of PO<3-> <,4>/NH<,4+>/Mg<2+>/is 1.4/1/1.4, the maximal removal rate of ammonia nitrogen is 86.7％.

关键词： ammonia-nitrogen wastewater chemical precipitation optimal pH value

作者: Shizhuang Shi Shuangqing Zhou Yuan Yuan

作者单位: Wuhan University of Science and Technology, Wuhan, China

会议类型: 国际会议

会议名称: 2006现代科技国际研讨会(The International Workshop on Modern Science and Technology in 2006)

会议地点: 北京

会议语种:英文

页码: 174-178

在线出版日期: 2006-04-01（万方平台首次上网日期，不代表论文的发表时间）