基于穿透电极的Electro-peroxone技术降解布洛芬

Effective degradation of ibuprofen by flow-through electro-peroxone process

利用网状玻碳电极(RVC)作为阴极,构建了一种基于穿透电极的electro-peroxone(E-peroxone)反应器,并系统研究了其对布洛芬的降解性能,考察了电流、流速等因素的影响,进行了能耗计算.结果表明,E-peroxone可以在30min内完全去除初始浓度为2.5mg/L的布洛芬,而电化学氧化和臭氧氧化去除率分别为59%和64%.曝入气体流速为250mL/min,气相臭氧浓度为8mg/L的条件下,电流为100mA,反应溶液流速为300mL/min时, E-peroxone技术去除布洛芬的效率最高,且能耗(EEO)仅为传统臭氧氧化技术的1/7(0.76kWh/m^3-logvs.5.30kWh/m^3-log).提高流速可以强化穿透电极E-peroxone体系中的传质,从而强化布洛芬的去除,并降低EEO.

By combining conventional ozonation with in situ electro-generation of hydrogen peroxide (H2O2) to enhance ozone (O3) transformation to hydroxyl radicals (·OH), the electro-peroxone (E-peroxone) treatment can significantly enhance the oxidation of ozone-refractory pollutants. A flow-through E-peroxone system was established using a reticulated vitreous carbon (RVC) as the cathode. The effects of main operational parameters (e.g., current and flow rate) on ibuprofen abatement were evaluated systematically. The results showed that the E-peroxone process could completely abate ibuprofen (initial concentration 2.5mg/L) in a synthetic solution in 30min, whereas conventional ozonation and electrolysis could only abated 64% and 59% of ibuprofen, respectively. The electrical energy consumption per log-order removal (EEO, kWh/m^3-log) of ibuprofen by ozonation was 5.30kWh/m^3-log, but was only 0.76kWh/m^3-log by the E-peroxone process under the conditions of 100mA, 250mL/min gas flow rate, 8mg/L ozone and 300mL/min solution flow rate. Increasing the solution flow rate to increase the kinetics of electrode mass transfer, the rate of ibuprofen abatement could be further enhanced in the flow-through E-peroxone process. These results suggest that flow-through E-peroxone process may provide an effective and energy-efficient alternative for the abatement of refractory pollutants in water treatment.