摘要：

采用次氯酸钠(NaClO)氧化法对乙炔清净废水进行预处理。分别考察了废水的pH、温度、NaClO溶液加入量和反应时间对废水中NH₃-N和COD去除率的影响,用正交实验的方法确定了NH₃-N的最佳处理条件。结果表明,NaClO溶液加入量对NH₃-N去除率的影响最大,其次是废水的温度和pH,反应时间的影响最小,对于200 mL的废水,最佳处理条件为:废水的pH为8、温度为50 ℃、NaClO溶液加入量为5.5 mL、反应时间为5 min。此时NH₃-N、COD和TN的去除率分别为99.8%、51.9%和90.9%,游离氯的剩余量很低。

关键词: 次氯酸钠氧化法, 乙炔清净废水, 氨氮, 影响因素

Abstract:

Sodium hypochlorite(NaClO) oxidation has been applied to the treatment of acetylene purification waste-water from chlor-alkali industry. The effects of pH value,temperature,dosage of NaClO solution and reaction time on the removal of NH₃-N and COD from wastewater have been investigated. In addition,the optimal treatment condi-tions of NH₃-N are fixed by orthogonal tests. The results show that the volume fraction of adding NaClO solution has the greatest effect on NH₃-N removing rate,temperature and pH of the wastewater have the second great effect,and reaction time has the least effect. For 200 mL of wastewater,the optimal treatment conditions are as follow:pH 8,temperature 50 ℃,NaClO dosage 5.5 mL and reaction time 5 min. Under these conditions,the removing rates of NH₃-N,COD and TN are 99.8%,51.9% and 90.9%,respectively,and the residual content of free chlorine in the effluent is quite low.

Key words: sodium hypochlorite oxidation, acetylene purification wastewater, ammonia nitrogen, influential factors

中图分类号: 

• X703.1