CLT酸生产废水的Fenton氧化预处理试验研究

针对CLT酸生产废水高含盐、高有机物浓度、难生物降解的特点,采用Fenton氧化对CLT酸生产废水进行了预处理试验研究,考察并确定了H2O2和FeSO4·7H2O用量及二者的摩尔比,pH值以及反应时间对H2O2剩余量以及COD去除率的影响.试验结果表明,在废水的初始pH值3~4,H2O2和FeSO4·7H2O的投加量分别为20mL/L和10g/L,反应时间为30min时,反应过程中H2O2恰好全部消耗,COD的去除率为56%.Fenton氧化预处理能明显改善CLT酸废水的可生化性,原水的BOD5/COD值为0.075,经最佳试验条件处理后可升高至0.37.GC-MS分析结果表明,原水中检测到的6种主要苯系有机污染物在Fenton氧化后均未检出,利于废水后续进行生化处理.试验表明,采用Fenton氧化技术对CLT酸生产废水进行预处理是可行的.

Pretreatment of CLT acid production wastewater by Fenton reagent

CLT acid production wastewater is a type of difficultly biodegraded organic wastewater.The wastewater contains high organic pollutants concentration and salinity.Fenton reagent was used for the pretreatment of CLT acid production wastewater.The parameters that affect the treatment efficiency,such as H2O2 and FeSO4·7H2O dosage and the molar ratio,pH and reaction time,were investigated and determined in this study.The results showed that the optimum conditions for the reaction were as follows: initial pH values of 3~4,30min rection time,20mL/L H2O2 dosage and 10g/L FeSO4·7H2O dosage.The H2O2 was just entirely consumed and the COD removal was 56% in the optimum condition.Fenton oxidation pretreatment can significantly improve the biodegradability of the production CLT acid wastewater.The BOD5/COD value of the raw wastewater was 0.075 while the value increased to 0.37 when treated by Fenton reagent in the optimum condition.6 benzene series materials can be detected in the raw wastewater by GC-MS.However,no featured organic pollutants can be detected when the wastewater was treated by Fenton oxidation.The pretreated wastewater can be further treated by biological technologies.The Fenton agent is suitable for the pretreatment of CLT acid production wastewater.