Fe^(2+)活化过硫酸盐预处理焦化废水试验研究

Experimental study on pretreatment of coking wastewater by Fe2+ activated persulfate

为降低焦化废水COD并改善其可生化性,采用Fe^(2+)活化过硫酸盐(PS)技术对焦化废水进行预处理,利用三维荧光光谱对处理前后焦化废水有机成分进行表征,探究PS及Fe^(2+)浓度、初始pH值、反应时间对处理效果的影响。结果表明,在PS和Fe^(2+)浓度分别为25,20 mmol/L,pH值为9时,反应120 min后,COD去除率46.23%;Fe^(2+)/PS体系能将原水中酚类及类腐殖酸类物质降解为小分子化合物;BOD_(5)/COD从0.14升至0.33,表明Fe^(2+)/PS技术可有效降解焦化废水中有机物,提高其可生化性。

In order to reduce the COD of coking wastewater and improve its biodegradability,Fe^(2+)activated persulfate(Fe^(2+)/PS)technology was used to pretreat the wastewater.The organic components of coking wastewater before and after pretreatment were characterized by three-dimensional fluorescence spectroscopy.The influence of PS and Fe^(2+)concentration,initial pH value and reaction time on the treatment effect was investigated.The results showed that when the concentration of PS and Fe^(2+)were 25 mmol/L and 20 mmol/L,the pH value was 9,after 120 min,the COD removal rate was 46.23%.The Fe^(2+)/PS system can effectively degrade the phenols and humic acids in raw water into small molecular compounds.The BOD_(5)/COD increased from 0.14 to 0.33,indicating that Fe^(2+)/PS system can effectively degrade organic matter in coking wastewater and improve its biodegradability.