折点氯化处理低浓度氨氮废水  

EXPERIMENTAL RESEARCH ON THE TREATMENT OF LOW CONCENTRATION AMMONIA NITROGEN WASTEWATER BY BREAKPOINT CHLORINATION

作　　者：黄海明[1] 肖贤明[1] 晏波[1] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点试验室

出　　处：《水处理技术》2008年第8期63-65,78,共4页Technology of Water Treatment

摘　　要：稀土冶炼废水是一种较难处理的工业废水,有机物含量少,盐度高,难以采用生化处理,使得低浓度NH4+-N无法得到有效去除。为了使该类废水能实现达标排放,对折点氯化去除NH4+-N进行了试验研究。试验表明,pH为7,Cl/NH4+为7:1时,反应10～15min,废水中NH4+-N去除率达98%,并对中和后的草酸沉淀母液进行了试验,发现Cl/NH4+为8:1时NH4+-N去除效果最好,余氯经Na2SO3还原后可被完全去除。通过经济分析,NH4+浓度在100mg·L-1左右的废水采用折点氯化处理是经济可行的。Rare earths smelting wastewater consisted of little organics and high salinity. Low concentration of NH4^＋-N was unable to be removed efficiently by biochemical process. The breakpoint chlorination to remove NH4^＋-N was performed. The results of simulated experiment showed that the removal rate of NH4^＋-N in wastewater reached 98% at pH of 7 and Cl/NH4^＋ ratio of 7：1 for 10-20 min of reaction time. Wastewater from deposited oxalic acid after neutralized was investigated, it indicated that NH4^＋-N removal was maximum when Cl/NH4^＋ was 8：1. Residual chlorine was removed completely by Na2SO3 deoxidizing. It is economical and feasible when the wastewater the concentration of NH4^＋ is around 100 mg·L^-1 being introduced breakpoint chlorination into the treatment.

关 键 词：氨氮废水 折点氯化 余氯 氨氮去除氯 

分 类 号：X703.1[环境科学与工程—环境工程]