Optimization of a Fenton-based process as a tertiary treatment of tannery wastewater through response surface methodology

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-11-22 DOI:10.1016/j.jwpe.2024.106588

Erika Pasciucco , Francesco Pasciucco , Antonio Panico , Renato Iannelli , Isabella Pecorini

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Abstract

Nowadays, the implementation of effective advanced oxidation systems in wastewater treatment plants (WWTPs) as tertiary treatment represents an urgent need and current topic of interest in the literature. The aim of this study was to identify the optimal operating conditions of an electrochemical peroxidation (ECP) process to maximize COD and color removals from tannery secondary effluents at neutral pH, as well as improve the cost-effectiveness of the ECP process by avoiding the addition of chemicals commonly used in conventional electro-Fenton process, which can increase the overall concentration of chlorides and sulphates in high-salinity effluent. To the best of our knowledge, no study in the literature has focused on the optimization of the ECP process for tannery wastewater treatment. Therefore, the influence of the independent variables (current density, electrolysis time and H₂O₂ concentration) and best parameter setting were investigated through a central composite design combined with response surface methodology (CCD-RSM). Under optimal conditions (36 mA/cm², 19.7 min and 9.9 g/L of H₂O₂), 74 % of COD and 96 % of color were removed by ECP. The optimized conditions for the ECP treatment were verified and tested on photo-electrochemical peroxidation (PECP) and photolysis processes. The irradiation with UV-C light in PECP and photolysis processes did not significantly improve the removal efficiency, while increasing the energy demand. This study provides a new engineering approach for the removal of recalcitrant COD, addressing key factors that limit the application of the conventional electro-Fenton process in WWTPs. Future research should improve the sustainability of the process for full-scale application.

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通过响应面方法优化作为制革废水三级处理的芬顿工艺

如今，在废水处理厂（WWTPs）中实施有效的高级氧化系统作为三级处理是一个迫切的需求，也是目前文献中关注的话题。本研究的目的是确定电化学过氧化（ECP）工艺的最佳操作条件，以便在中性 pH 值条件下最大限度地去除制革厂二级污水中的 COD 和色素，同时避免添加传统电-芬顿工艺中常用的化学品（这些化学品会增加高盐度污水中氯化物和硫酸盐的总体浓度），从而提高 ECP 工艺的成本效益。据我们所知，文献中还没有关于制革废水处理 ECP 工艺优化的研究。因此，我们通过中心复合设计结合响应面方法（CCD-RSM）研究了自变量（电流密度、电解时间和 H2O2 浓度）和最佳参数设置的影响。在最佳条件下（36 mA/cm2、19.7 分钟和 9.9 g/L H2O2），ECP 去除了 74% 的 COD 和 96% 的色素。ECP 处理的优化条件在光电化学过氧化（PECP）和光解过程中得到了验证和测试。在 PECP 和光解过程中使用 UV-C 光照射并没有显著提高去除效率，反而增加了能源需求。这项研究为去除难降解的 COD 提供了一种新的工程方法，解决了限制传统电-芬顿工艺在污水处理厂应用的关键因素。未来的研究应提高该工艺在大规模应用中的可持续性。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies