Sequential electro-coagulation and electro-Fenton processes for the treatment of textile wastewater.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Palak Agarwal, Vikas K Sangal, Sanjay Mathur
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引用次数: 0

Abstract

Textile wastewater, laden with persistent dyes and non-biodegradable organics, poses a challenge for treatment in common effluent treatment plants (CETPs) using conventional methods. Pre-treatment of textile effluents is essential to ensure compatibility with CETPs. The present study employed three-dimensional (3D) aluminum and graphite electrodes for a sequential electro-coagulation and electro-Fenton (EC + EF) process. An experimental plan of 25 experiments was constructed using Taguchi method. The combination resulted in high removal efficiencies: 99.91% for color, 93.20% for chemical oxygen demand (COD), and 91.75% for total organic carbon (TOC) for the operating parameters; for EC, current density (J): 20 mA/cm2, time (t): 45 min, speed of rotation (N): 55 rpm; and for EF, current density (J): 25 mA/cm2, time (t): 50 min, iron concentration: 40 mg/L. Post-treatment, the wastewater exhibited an enhanced biodegradability index of 0.875, rendering it suitable for CETPs. There was an increase of 11% in the total energy consumption when energy spent during rotation and aeration at the time of EC and EF, respectively, were considered. This energy increases the cost and is not accounted for, in previous research. The energy consumption in kWh per g of COD removed at optimum condition for the hybrid treatment was 0.0314, which is lower than the energy consumption by other electrochemical processes employing plate electrodes. This indicates that 3D electrodes are more energy efficient than plate electrodes. PRACTITIONER POINTS: Hybrid electrochemical processes can be used as pre-treatment method for textile effluents. Three-dimensional electrodes improve removal rates with lower energy consumption. Significant color, COD, and TOC abatement were noted post-hybrid treatment of textile wastewater. Biodegradability of the textile effluent improves after the hybrid treatment.

用于处理纺织废水的序贯电凝和电-芬顿工艺。
纺织废水中含有持久性染料和不可生物降解的有机物,对普通污水处理厂(CETP)采用传统方法进行处理构成了挑战。为了确保与 CETP 的兼容性,必须对纺织污水进行预处理。本研究采用了三维(3D)铝电极和石墨电极,用于序贯电凝和电-芬顿(EC + EF)工艺。采用田口方法制定了一个包含 25 个实验的实验计划。这一组合产生了很高的去除率:对于 EC,电流密度 (J): 20 mA/cm2,时间 (t):45 分钟,转速(N):55 rpm;对于 EF,电流密度(J):25 mA/cm2,时间(t):50 分钟,铁浓度:0.5%:50 分钟,铁浓度40 毫克/升。经过处理后,废水的生物降解指数提高到 0.875,适合用于 CETP。如果考虑到 EC 和 EF 时旋转和曝气所消耗的能量,总能耗将增加 11%。这部分能耗增加了成本,在以前的研究中没有考虑在内。在最佳条件下,混合处理每去除 1 克 COD 的能耗为 0.0314 千瓦时,低于其他采用平板电极的电化学工艺的能耗。这表明三维电极比平板电极更节能。实践要点:混合电化学工艺可用作纺织污水的预处理方法。三维电极能以更低的能耗提高去除率。混合处理纺织废水后,色度、化学需氧量和总有机碳的去除率显著提高。混合处理后,纺织废水的生物降解性得到改善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Water Environment Research
Water Environment Research 环境科学-工程:环境
CiteScore
6.30
自引率
0.00%
发文量
138
审稿时长
11 months
期刊介绍: Published since 1928, Water Environment Research (WER) is an international multidisciplinary water resource management journal for the dissemination of fundamental and applied research in all scientific and technical areas related to water quality and resource recovery. WER''s goal is to foster communication and interdisciplinary research between water sciences and related fields such as environmental toxicology, agriculture, public and occupational health, microbiology, and ecology. In addition to original research articles, short communications, case studies, reviews, and perspectives are encouraged.
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