Anti-passivation and performance optimization of tubular electrocoagulation reactor with synchronous flotation

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-10-15 DOI:10.1016/j.jwpe.2024.106298

Yang Xu , Haitao Zhu , Wei Xiong , Yaqin Wu , Congjie Gao

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引用次数: 0

Abstract

Electrocoagulation (EC) technology has the nature of high removal efficiency, simple operation and small sludge volume for wastewater pollutant removal. However, the electrode passivation occurs inevitably during EC process, leading to the inefficient and unstable treatment. This study examines passivation and corrosion behavior of tubular electrode using dynamic potential polarization tests. The results indicate that mitigation of electrode passivation can be achieved by adjusting pH, electrolyte and electrode shape. Then effects of current intensity, pH, flow rate and electrolyte concentration on silicon removal efficiency using with the tubular electrocoagulation are investigated. The silicon removal rate at 0.6 A, pH 9, 50 mL/min and 2.0 g/L (NaCl) achieves >97 % and treatment effect keeps stable as tubular electrode is consumed until penetrated. This indicates that alkalinity, chloride medium and tubular shape can simultaneously inhibit electrode passivation and remove pollutants efficiently by tubular EC reactor with synchronous flotation. Furthermore, removal mechanism of tubular EC is explored by SEM, FTIR, XRD, and XPS analysis. Results suggests the nanoscale boehmite flocs with high activity and easy adsorption are flocculated with simultaneously generated microbubbles, which is conductive to adsorbing, coprecipitating and floating the silicon pollutant. This work provides a facile and effective strategy for prominent anti-passivation and silicon removal performance of EC.

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同步浮选管式电凝反应器的反钝化和性能优化

电凝聚（EC）技术在去除废水污染物方面具有去除效率高、操作简单、污泥量小的特点。然而，在电解过程中，电极钝化不可避免地会发生，从而导致处理效率低下且不稳定。本研究利用动态电位极化测试研究了管状电极的钝化和腐蚀行为。结果表明，通过调节 pH 值、电解质和电极形状可减轻电极钝化。然后，研究了电流强度、pH 值、流速和电解液浓度对管状电凝脱硅效率的影响。在 0.6 A、pH 值 9、50 mL/min 和 2.0 g/L (NaCl)条件下，硅去除率达到 97%，并且随着管状电极的消耗直至穿透，处理效果保持稳定。这表明，碱度、氯化物介质和管形可同时抑制电极钝化，管式电解反应器与同步浮选可有效去除污染物。此外，还通过扫描电镜、傅立叶变换红外光谱、XRD 和 XPS 分析探讨了管式电解槽的去除机理。结果表明，高活性、易吸附的纳米级波姆石絮凝体与同时产生的微气泡絮凝在一起，对硅污染物具有吸附、共沉淀和上浮的传导作用。这项工作为提高导电瓷的抗钝化和除硅性能提供了一种简便有效的策略。

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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