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A cost-effective Electro-Fenton process with graphite felt electrode aeration for degradation of dimethyl phthalate: Enhanced generation of H2O2 and iron recycling that simultaneously regenerates the electrode
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-04-09 , DOI: 10.1016/j.cej.2020.125033
Dong Li , Tong Zheng , Yulei Liu , Ding Hou , Haiyang He , Haoran Song , Jiaming Zhang , Shiqi Tian , Wei Zhang , Lu Wang , Jun Ma

A graphite felt electrode with electrode aeration (GF-EA) was used for the Electro-Fenton treatment of dimethyl phthalate (DMP) wastewater. At pH 3.0, removal efficiencies of 200 mg/L DMP and solution TOC by EA were 50.0% and 55.4% higher than solution aeration (SA), respectively. At pH 4.0 and 5.5, EA showed 36.4-56.1% and 9.4-35.7% higher removal for 20-50 mg/L DMP and TOC than SA, respectively. High effective degradation performance of EA was attributed to the enhanced mass transfer of O2 and the solution, which provided the sufficient active area for H2O2 electro-generation and promoted the Fe3+/Fe2+ cycling, thus increasing the •OH content. Using EA, GF could collect iron sludge at low O2 flux, and then strip it for reuse at large air flux. This process regenerated GF electrode and elided the disposal of iron sludge. By supplementing one-fifth of the original FeSO4 dosage, the operation costs of the iron-sludge-stripping EA system were 35% and 27% of those in SA system for the same removal of 200 mg/L and 20 mg/L DMP, respectively. During long-term use, DMP degradation performance of EA gradually improved due to the increased hydrophilic property and oxygen-containing functional groups, while the decreased DMP removal with SA was ascribed to the electrode poisoning caused by iron sludge deposition.



中文翻译:

具有成本效益的Electro-Fenton工艺,采用石墨毡电极曝气以降解邻苯二甲酸二甲酯:增强了H 2 O 2的产生和铁的回收,同时使电极再生

带有电极曝气的石墨毡电极(GF-EA)用于邻苯二甲酸二甲酯(DMP)废水的电子芬顿处理。在pH 3.0时,EA去除200 mg / L DMP和溶液TOC的效率分别比溶液曝气(SA)高50.0%和55.4%。在pH 4.0和5.5下,EA对20-50 mg / L DMP和TOC的去除率分别比SA高36.4-56.1%和9.4-35.7%。EA的高效降解性能归因于O 2和溶液的传质增强,从而为H 2 O 2的发电提供了足够的活性区域,并促进了Fe 3+ / Fe 2+循环,从而增加了• OH含量。GF使用EA可以收集低O 2的铁污泥通量,然后将其剥离以在大通量下重复使用。此过程再生了GF电极,并消除了铁渣的处理。通过补充原来的五分之一的FeSO 4剂量,同样去除200 mg / L和20 mg / L DMP,铁污泥汽提EA系统的运行成本分别为SA系统的35%和27% , 分别。长期使用过程中,由于亲水性和含氧官能团的增加,EA的DMP降解性能逐渐提高,而SA去除DMP的减少归因于铁泥沉积引起的电极中毒。

更新日期:2020-04-09
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