Fered-Fenton法处理石化废水反渗透浓水

Treatment of reverse osmosis concentrate of petrochemical wastewater by Fered-Fenton process

以Ti金属网为阴极、Ti负载Ru O2金属网为阳极,构建Fered-Fenton反应系统,处理石化废水反渗透膜法浓水。考察H2O2浓度、Fe2+浓度、初始p H值和电流密度等因素对废水处理效果的影响,并分析了废水可生化性及污染物降解规律。结果表明,在H2O2浓度为75.0 mmol/L,Fe2+浓度为7.5 mmol/L,初始p H值为3.0,电流密度为5.1 m A/cm2的条件下,反应120 min后废水TOC可由198.2 mg/L降到99.6 mg/L,有机污染物矿化率达到49.7%,BOD5/COD由0.11提高至0.31,废水可生化性明显改善。三维荧光光谱(EEM)分析结果表明,Fered-Fenton法对废水中类蛋白、类富里酸等荧光有机物去除率达到66.7%,该类大分子难降解有机物的氧化降解有利于改善废水可生化性,为进一步的生化处理创造了良好的条件。

A Fered-Fenton system using Ti sheet as cathode and Ru O2/ Ti as anode was established for treating reverse osmosis concentrate of petrochemical wastewater. The effects of H2O2 and Fe2 +concentration,initial p H and applied current on treatment efficiency were investigated. Furthermore,the variations of biodegradability and characteristic pollutants were also analyzed. The results showed that the optimum reaction conditions were H2O2 dosage of 75. 0 mmol / L,Fe2 +dosage of 7. 5 mmol / L,initial p H value of 3. 0 and current intensity of5. 1 m A / cm2. After reaction of 120 min,the TOC concentration decreased from 198. 2 mg / L to 99. 6 mg / L,corresponding to organics mineralization efficiency of 49. 7%. The organic pollutants concentration significantly decreased and the biodegradability was obviously improved with the BOD5/ COD ratio increasing from 0. 11 to0. 31. The excitation-emission matrix( EEM) spectrum analysis demonstrated that the total removal efficiency of fluorescence organics including protein-like and fulvic acids substances reached 66. 7% by Fered-Fenton technique,which was in favor of improvement of biodegradability and further biological treatment.