Three-dimensional electro-Fenton system with iron-carbon packing as a particle electrode for nitrobenzene wastewater treatment

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Baoshan Wang, Peiyu Zhao, Xiaona Zhang, Yang Zhang, Yingming Liu
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Abstract

Traditional Fenton oxidation is an effective method for reducing pollutants that are difficult to degrade. Owing to the large amounts of Fe(II), acids, and alkalis added in the reaction, large amounts of Fenton sludge are produced, increasing treatment costs and restricting the method’s application. In this study, we developed a three-dimensional electro-Fenton system by adding iron-carbon filler and investigated the effects of different electrolytic cell structure arrangements, particle electrode dosages, sponge iron (SI) to granular activated carbon (GAC) dosage ratios, current densities, H2O2 dosages, and cathodic aeration on nitrobenzene (NB) wastewater treatment. The optimal system conditions were a particle electrode dosage of 100 g/L, SI:GAC mass ratio of 3:1, current density of 30 mA/cm2, H2O2 dosage of 50 mmol/L, cathodic aeration of 0.8 L/min, and hydraulic retention time of 120 min. The average NB removal rate and chemical oxygen demand reached 67.38%±1.05% and 70.60%±1.15%, respectively, for which the increase in Fenton sludge was 891.8 mg/L. Different from the traditional Fenton process, additional Fe(II) was not required in the process used herein, reducing iron sludge accumulation and lowering the operating costs of using Fenton sludge as a hazardous waste treatment. In addition, the process applied in this study was able to reduce the chemical amounts used and increase the treatment efficiency. The reductions in sludge treatment costs and secondary pollutants make the proposed process an efficient and sustainable alternative for treating NB wastewater.

Abstract Image

以铁碳填料作为颗粒电极的三维电-芬顿系统用于硝基苯废水处理
传统的芬顿氧化法是减少难以降解的污染物的有效方法。由于反应中加入了大量的铁(II)、酸和碱,会产生大量的 Fenton 污泥,增加了处理成本,限制了该方法的应用。在本研究中,我们通过添加铁碳填料开发了一种三维电-芬顿系统,并研究了不同电解池结构布置、颗粒电极用量、海绵铁(SI)与颗粒活性炭(GAC)用量比、电流密度、H2O2用量和阴极曝气对硝基苯(NB)废水处理的影响。最佳系统条件为:颗粒电极用量为 100 g/L,SI:GAC 质量比为 3:1,电流密度为 30 mA/cm2,H2O2 用量为 50 mmol/L,阴极曝气量为 0.8 L/min,水力停留时间为 120 min。平均 NB 去除率和化学需氧量分别达到 67.38%±1.05%和 70.60%±1.15%,其中 Fenton 污泥增加量为 891.8 mg/L。与传统的 Fenton 工艺不同,本研究采用的工艺不需要额外添加 Fe(II),减少了铁污泥的积累,降低了利用 Fenton 污泥处理危险废物的运行成本。此外,本研究采用的工艺还能减少化学品用量,提高处理效率。污泥处理成本和二次污染物的减少使拟议工艺成为处理 NB 废水的一种高效、可持续的替代方法。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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