沸石的改性及其对水源水中氨氮去除的研究

Research on zeolite modification and its removal of ammonia-nitrogen in source water

摘要: 以水源水为处理对象,通过对沸石进行酸、盐、高温改性和氨氮去除试验,考察沸石粒径、接触时间、温度等因素对氨氮去除的影响。结果表明,经盐(NaCl)改性的沸石对氨氮有较高的去除率,对于氨氮浓度为4.43mg/L的水源水,在粒径0.8～1.7mm、温度25℃的条件下,经15min接触,氨氮浓度可降至0.3mg/L,去除率可达93.2%。改性沸石对氨氮的去除机理是沸石表面(及内部孔隙)吸附作用和离子交换作用。对于普通自来水厂,只需将快滤池中常用的石英砂部分替换成改性沸石即可有效去除饮用水中的氨氮。经测算其投资仅增加33～39元/m3,运行费用基本不变。

Abstract: High concentration of ammonia-nitrogen in source water is extremely harmful to human health.How to remove ammonia-nitrogen efficiently and at low-cost in tap water has been a tough problem for numerous water plants.In this study,experiments were conducted using source water to investigate the effect of zeolite size,contact time and temperature upon the ammonia-nitrogen removal by zeolite modification with acid,salt and high temperature and the ammonia-nitrogen removal test.The results show that ...