硫酸根自由基高级氧化技术处理有机废水研究

Experimental Study of Treatment of Organic Wastewater by Advanced Oxidation Process of Sulfate Radicals

硫酸根自由基高级氧化技术基于具有极高氧化还原电位的硫酸根自由基,可以氧化降解多种有机污染物,是近年来化学法水处理技术的研究热点。本项目通过Fe2+活化过硫酸钾产生的硫酸根自由基降解邻苯二甲酸氢钾,来模拟处理工业废水中的有机物。结果表明,初始pH值和Fe2+浓度对邻苯二甲酸氢钾去除效果影响不大,K_2S_2O_8投加量与邻苯二甲酸氢钾去除率呈现明显的正相关关系。当初始pH值为3,n(FeSO4·7H2O)︰n(K_2S_2O_8)=0.5︰1,m(K_2S_2O_8)︰m(COD)=30︰1时,COD去除率达到72.41%。在实际生产中,可将初始pH值控制在5左右,选用溶解度更大的过硫酸钠替代过硫酸钾。

The advanced oxidation process of sulfate radicals is a research hotspot on chemical treatment method of wastewater in recent years which able to degrade various organic pollutants based on its high ORP(Oxidation-Reduction Potential). This study simulatively treats the organic pollutants in industrial wastewater on degrading the KHP(potassium acid phthalate) by sulfate radicals produced by the KPS(potassium persulfate) activated by ferrous. The results show that the degradation of KHP is not greatly affected by the initial pH and ferrous concentration, but positively correlated with the dosage of KPS. The COD(Chemical Oxygen Demands) removal rate could reach to 72.41 % when the intial pH=3, n(FeSO4·7H2O)︰n(K2S2O8)=0.5︰1, m(K2S2O8)︰m(COD)=30︰1. In practice, the initial pH could be set around 5, and use the sodium persulfate(NaPS) which is better solubility instead of the KPS.