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.
出处
《水处理技术》
CAS
CSCD
北大核心
2008年第8期63-65,78,共4页
Technology of Water Treatment
关键词
氨氮废水
折点氯化
余氯
氨氮去除氯
nitrogen wastewater
breakpoint chlorination
residual chlorine
removal efficiency of ammonia nitrogen
