Engineering and Technology Research Center for Agricultural Land Pollution Integrated Prevention and Control of Guangdong Higher Education Institute, College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China.
Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore.
Water Res. 2022 Jun 30;218:118499. doi: 10.1016/j.watres.2022.118499. Epub 2022 Apr 23.
The increasing amount of sewage sludge produced in wastewater treatment plants (WWTPs) poses a great challenge to both environment and economy globally. As a requisite process during sludge treatment, sludge dewatering can significantly minimize the sludge volume and lower the operational cost for downstream transportation and disposal. Iron-based advanced oxidation process (AOP), a robust and cost-effective technique with relatively low technical barriers for high-level sludge dewatering, has been widely explored in the past 20 years. The development was mainly driven by the demands of efficient and sustainable sludge conditioning technology and the flexible sludge management approaches. The application of iron-based AOPs in sludge dewatering process attracts more and more attention. In this work, we discussed the current application of iron-based AOPs technology in the sludge dewatering processes in a holistic manner, summarized the factors affecting the sludge dewaterability in the treatment processes, and analyzed the mechanisms of iron-based AOPs to improve dewatering processes. Furthermore, we elaborated potential advantages, limitations, and challenges associated with implementing iron-based AOPs in the full-scale plants and shared the opportunities for sludge reutilization. This review aims to contribute to the development of highly efficient iron-based AOPs for sludge dewatering and offer perspectives and directions towards the new-generation of WWTPs with the sustainable and eco-friendly benefits.
污水处理厂（WWTPs）产生的污水污泥量不断增加，给全球环境和经济带来了巨大挑战。污泥脱水是污泥处理过程中的必要环节，它可以显著减小污泥体积，降低下游运输和处置的运营成本。铁基高级氧化工艺（AOP）是一种强大且具有成本效益的技术，具有相对较低的技术壁垒，可用于高水平的污泥脱水，在过去 20 年中得到了广泛的探索。其发展主要受到高效、可持续的污泥调理技术和灵活的污泥管理方法的需求推动。铁基 AOP 在污泥脱水过程中的应用引起了越来越多的关注。在这项工作中，我们全面讨论了铁基 AOP 技术在污泥脱水过程中的当前应用，总结了处理过程中影响污泥脱水性能的因素，并分析了铁基 AOP 改善脱水过程的机理。此外，我们详细阐述了在全规模工厂中实施铁基 AOP 相关的潜在优势、局限性和挑战，并分享了污泥再利用的机会。本综述旨在为高效铁基 AOP 用于污泥脱水的发展做出贡献，并为具有可持续和生态友好效益的新一代 WWTP 提供新的视角和方向。
