电凝
废水
总有机碳
响应面法
化学
有机质
电流密度
污水处理
阳极
电化学
制浆造纸工业
过氧化氢
核化学
环境化学
电极
环境工程
环境科学
色谱法
有机化学
物理化学
工程类
物理
量子力学
作者
Déborah L. Villaseñor-Basulto,Alain R. Picos-Benítez,Martín Pacheco‐Álvarez,Tzayam Pérez,Erick R. Bandala,Juan M. Peralta‐Hernández
标识
DOI:10.1016/j.jece.2022.107290
摘要
Tannery wastewater was performed using electrocoagulation (EC) coupled with an electro-Fenton (EF) process and boron-doped diamond (BDD) anodes to generate hydrogen peroxide (H2O2), and then optimized using the response surface methodology (RSM). Effects of three independent variables (e.g., reaction time, current density and Fe2+ concentration) on the performance of electrochemical processes were analyzed using a statistical experimental design. Current density and reaction time were significant for total organic carbon (TOC) removal when the EC and EF processes were tested. The interaction between initial Fe2+ concentration (0.66 mM L-1, the highest value) and reaction time was significant and achieved 32% TOC removal, but because it was used with the highest current density value tested (70 mA cm-2), the energy consumption was as high as 74.5 kWh m-3. Optimization of the process for TOC removal and energy consumption was accomplished by lowering the current density and treatment time values (40 mA cm-2 and 217 min) during EF treatment. Under these conditions, 25% of TOC removal was achieved. The integrated EC-EF system generated 64% TOC removal using a greater current density (9.7 mA cm-2) during the EC process, and the overall treatment energy consumption was 22.3 kWh m-3. The sludge produced under the tested EC conditions exhibited no hazardous characteristics. The EC treatment was also faster in TOC abatement (sixth-order kinetic), compared to the EF treatment (third-order kinetic).
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