Reductive Electrochemical Activation of Hydrogen Peroxide as an Advanced Oxidation Process for Treatment of Reverse Osmosis Permeate during Potable Reuse
Reductive Electrochemical Activation of Hydrogen Peroxide as an Advanced Oxidation Process for Treatment of Reverse Osmosis Permeate during Potable Reuse
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过氧化氢的还原电化学活化作为饮用水再利用过程中反渗透渗透物处理的高级氧化工艺
DOI：
10.1021/acs.est.0c02144
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发表时间：
2020
影响因子：
11.4
通讯作者：
Mitch, William A.
中科院分区：
文献类型：
--
作者：
Weng, Cindy;Chuang, Yi-Hsueh;Davey, Bradley;Mitch, William A.
UV/H2 O2高级氧化工艺（AOP）是一种高效的反渗透水处理工艺，H2 O2的利用率仅为10%。本研究评估了低成本不锈钢阴极通过电子转移产生·OH。在去离子水中，电化学系统仅使用1.25 mg/L H2 O2在4 min内实现了0.5 log去除1，4-二氧六环，这是AOP验证可饮用重复使用的基准。与标准氢电极相比，过氧化氢和1，4-二氧六环降解分别在接近−0.18和+ 0.02 V时达到最大值。带正电荷和负电荷的化合物的降解与中性1，4-二氧六环相当，表明降解是通过中性H2 O2产生·OH而发生的，并且污染物从电极的静电排斥没有问题。对于没有氯胺的ROP，在6.7分钟内用离子强度为7 mM的盐和2.5 mg/L H2 O2实现0.5 log 1，4-二氧六环去除。对于ROP与1.4 mg/L的氯氯胺，0.5 log 1，4-二氧六环去除实现在13.2分钟内与7 mM的盐和4.5 mg/L的总H2 O2剂量在三个单独的注射在5分钟的间隔。初步估计的基础上，实验室规模的电化学AOP处理表明，除了盐的成本，电化学AOP功能较低的试剂成本比UV/H2O 2AOP，但较高的电力成本，可以通过优化的电化学设计来降低。
The UV/hydrogen peroxide (H2O2) advanced oxidation process (AOP) frequently employed to generate hydroxyl radical (•OH) to treat reverse osmosis permeate (ROP) in potable reuse treatment trains is inefficient, using only 10% of the H2O2. This study evaluated·OH generation by electron transfer from a low-cost stainless steel cathode. In deionized water, the electrochemical system achieved 0.5 log removal of 1,4-dioxane, a benchmark for AOP validation for potable reuse, within 4 min using only 1.25 mg/L H2O2. Hydrogen peroxide and 1,4-dioxane degradations were maximized near −0.18 and + 0.02 V versus standard hydrogen electrode, respectively. Degradations of positively and negatively charged compounds were comparable to neutral 1,4-dioxane, indicating that degradation occurs by·OH generation from neutral H2O2and that electrostatic repulsion of contaminants from the electrode is not problematic. For ROP without chloramines, 0.5 log 1,4-dioxane removal was achieved in 6.7 min with 7 mM salts for ionic strength and 2.5 mg/L H2O2. For ROP with 1.4 mg/L as Cl2chloramines, 0.5 log 1,4-dioxane removal was achieved in 13.2 min with 7 mM salts and 4.5 mg/L total H2O2dosed in three separate injections in 5 min intervals. Initial estimates based on lab-scale electrochemical AOP treatment indicated that, except for the cost of salts, the electrochemical AOP featured lower reagent costs than the UV/H2O2AOP but higher electricity costs that could be reduced by optimization of the electrochemical design.