基于过硫酸盐的含聚废水的降解试验研究

Research on Degradation of Polyethylene-containing Wastewater by Persulfate

利用反应体系中产生的强氧化性自由基,可使水体中有机物污染物分解成小分子物质,基于硫酸自由基(SO4.-)的氧化可降解有机污染物。本文采用化学手段对模拟废水中的有机污染物(主要是聚丙烯酰胺)进行降解,研究亚铁盐及加过硫酸盐与亚铁盐复配的降解效果,考察反应时间、pH值、搅拌对降解效果的影响。结果表明:FeSO4和Na2S2O8复配降解HPAM去除率最高为42.22%,HPAM的去除起主导作用的为硫酸自由基的生成;反应条件中,搅拌条件有利于反应,HPAM去除效果最佳反应时间是2～3 h,pH值为3。

Strong oxidizing free radicals generated in the reaction system can decompose organic pollutants in wastewater into small molecules, so sulfate radical （SO4-） may be used to degrade organic pollutants. In this paper, organic pollutant （ polyacrylamide ） in simulated wastewater was degraded by the chemical method, degradation effects of ferrous salt and persulfate/ ferrous salt mixture were studied. Effect of reaction time, pH, stirring on degradation result was analyzed. The results show that ：the removal rate of HPAM by FeSO4 and Na2S2O4 mixture is up to 42.22%, generated sulfate free radicals play a dominant role for HPAM removal; The stirring is helpful for the reaction, optimal reaction time is 2-3 h, optimal pH is 3.