Student research committee, Qazvin University of Medical Sciences, Qazvin, Iran.
Department of Environmental Health Engineering, School of Health, Qazvin University of Medical Sciences, Qazvin, Iran.
Environ Sci Pollut Res Int. 2021 Aug;28(32):43143-43172. doi: 10.1007/s11356-021-14631-w. Epub 2021 Jun 23.
Electrocoagulation (EC) is one of the emerging technologies in groundwater and wastewater treatment as it combines the benefits of coagulation, sedimentation, flotation, and electrochemical oxidation processes. Extensive research efforts implementing EC technology have been executed over the last decade to treat chemical oxygen demand (COD)-rich industrial wastewaters with the aim to protect freshwater streams (e.g., rivers, lakes) from pollution. A comprehensive review of the available recent literature utilizing EC to treat wastewater with high COD levels is presented. In addition, recommendations are provided for future studies to improve the EC technology and broaden its range of application. This review paper introduces some technologies which are often adopted for industrial wastewater treatment. Then, the EC process is compared with those techniques as a treatment for COD-rich wastewater. The EC process is considered as the most privileged technology by different research groups owing to its ability to deal with abundant volumes of wastewater. After, the application of EC as a single and combined treatment for COD-rich wastewaters is thoroughly reviewed. Finally, this review attempts to highlight the potentials and limitations of EC. Related to the EC process in batch operation mode, the best operational conditions are found at 10 V and 60 min of voltage and reaction time, respectively. These last values guarantee high COD removal efficiencies of > 90%. This review also concludes that considerably large operation costs of the EC process appears to be the serious drawback and renders it as an unfeasible approach for handling of COD rich wastewaters. In the end, this review has attempted to highlights the potential and limitation of EC and suggests that vast notably research in the field of continuous flow EC system is essential to introduce this technology as a convincing wastewater technology.
电化学混凝（EC）是地下水和废水处理领域的新兴技术之一，因为它结合了混凝、沉淀、浮选和电化学氧化过程的优点。在过去的十年中，为了保护淡水溪流（如河流、湖泊）免受污染，已经进行了大量的研究工作，利用 EC 技术处理高化学需氧量（COD）的工业废水。本文对利用 EC 处理高 COD 废水的最新文献进行了综述。此外，还为未来的研究提供了建议，以改进 EC 技术并扩大其应用范围。
本综述文章介绍了一些常用于工业废水处理的技术。然后，将 EC 工艺与这些技术进行了比较，作为处理 COD 丰富废水的方法。由于其处理大量废水的能力，不同的研究小组认为 EC 工艺是最优先的技术。
之后，全面审查了 EC 作为单一和组合处理 COD 丰富废水的应用。最后，本综述试图强调 EC 的潜力和局限性。
关于批量操作模式下的 EC 工艺，在 10V 和 60 分钟的电压和反应时间下可以找到最佳的操作条件，分别保证了>90%的高 COD 去除效率。
本综述还得出结论，EC 工艺的操作成本相当高，这似乎是一个严重的缺点，使得它作为处理 COD 丰富废水的不可行方法。最后，本综述试图强调 EC 的潜力和局限性，并建议在连续流动 EC 系统领域进行大量研究，以将这项技术作为一种有说服力的废水处理技术引入。
