超重力-电催化-Fenton耦合法处理含酚废水

Treatment of Phenol-containing Wastewater by Coupled Method of High Gravity Technology?Electrocatalytic Oxidation?Fenton Oxidation

采用超重力-电催化-Fenton耦合法处理含酚废水,确定了适宜的工艺条件,与电催化-Fenton耦合法、超重力-电催化耦合法和电催化氧化法的去除效果进行了对比.结果表明,在电流密度200 A/m^2、初始p H值3、投加量FeSO_4×7H_2O 1.25 g/L和H_2O_2 40 mmol/L、超重力因子30、液体循环流量80 L/h、降解时间1 h的条件下,处理初始浓度100 mg/L的含酚废水,苯酚和化学需氧量(COD)去除率分别达99.56%和65.43%;废水处理后可生化系数(BOD/COD)由0.081提高到0.52,满足可生化处理要求;相近条件下本实验方法较其他3种方法苯酚去除率分别提高28.05%,84.13%和94.79%,并缩短了反应时间.

The coupled method of high gravity technology-electrocatalytic oxidation and Fenton oxidation was adopted to treat phenol-containing wastewater. The treatment conditions were optimized. The removal rate of phenol-containing wastewater by the coupled method was compared with that by electrocatalytic-Fenton oxidation, high gravity-electrocatalytic oxidation and electrocatalytic oxidation methods. The results showed that the removal rate of phenol and COD could reach up to 99.56% and 65.43%, respectively after 1 h under the conditions of current density 200 A/m^2, initial pH value 3, FeSO4·7H2O dosage 1.25 g/L, H2O2 dosage 40 mmol/L, high gravity factor 30 and liquid circulating flowrate 80 L/h. BOD/COD of the treated wastewater increased from 0.081 to 0.53, which accorded with the requirements of biochemical treatment. The removal rate of phenol was 28.05%, 84.13% and 94.79% higher than the three other methods under similar conditions, respectively. The coupled method of high gravity technology-electrocatalytic oxidation and Fenton oxidation could shorten the reaction time and improve the degradation rate of phenol-containing wastewater.