芬顿氧化试验中残余双氧水对CODcr测定的影响研究

在采用Fenton高级氧化技术对垃圾压滤液进行处理时,作为氧化剂的双氧水经常不能完全消耗。而使用重铬酸钾法进行CODcr测定时,待测水体中残余的双氧水会表现出还原性而消耗重铬酸钾,对最终CODcr测定结果产生影响。本文分析了在垃圾压滤液中不同浓度双氧水对CODcr测定的影响大小,得出双氧水浓度对CODcr影响曲线,同时为消除双氧水对CODcr测定结果影响,在试验中投加过量硫酸亚铁与双氧水反应,当投加量达到理论反应量的1.0～1.2倍时,对双氧水去除效果最好,使后续的CODcr测定试验更加准确。

Study on Influence of Residual Hydrogen Peroxide on CODcr Determination in Fenton Oxidation Experiment

Hydrogen peroxide,as an oxidizing agent,was often not completely consumed when percolating liquid of rubbish was treated with Fenton method.With its reduction property,hydrogen peroxide could react with dichromate potassium.Consequently,the determination of CODcr was affected by residual hydrogen peroxide in water to be tested.This paper analyzed the influence of CODcr determination in different hydrogen peroxide concentrations,and concluded the curve of hydrogen peroxide concentration versus CODcr.Meanwhile,in order to eliminate the influence of CODcr determination by hydrogen peroxide,excessive ferrous sulfate,as reducing agent,reacted with hydrogen peroxide.When the practical dosage of hydrogen peroxide was 1.0~1.2 times of theoretical amount,it showed best removal effect of hydrogen peroxide and the test result of CODcr tended to be more accurate.