Sludge dewaterability improvement by the coagulation/flocculation based conditioning methods: influencing factors, high performance, and future prospect

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-06-16 DOI:10.1016/j.biteb.2025.102174

Misha Liu , Fajiao Zou , Jie Li , Qingbo Zhang , Feixin Wang , Guojun Hong , Jifu Yin

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Abstract

The coagulation and flocculation based conditioning technologies have long been employed as effective pretreatments to enhance sludge dewaterability, owing to their cost-efficiency, operational simplicity, and high effectiveness. This review systematically elaborates on seven key factors impacting the final dewatering performance, from the aspects of sludge particle, floc property and filter cake structure, respectively. In particular, the recent progress of the coagulation (Wc of sludge cake, range from 57.7 % to 81.6 %) and flocculation (Wc of sludge cake, range from 65.0 % to 85.2 %) based conditioning methods is examined in detail, with special emphasize on the combined usage of coagulation/flocculation as co-conditioning strategy (Wc of sludge cake, range from 53.5 % to 89.7 %). Finally, the challenges and future development of coagulation/flocculation as pretreatment are discussed and proposed. This review aims to offer a theoretical foundation and technical insights to guide applications and research in coagulation/flocculation based conditioning for sludge dewatering.

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混凝/絮凝调质法改善污泥脱水性能：影响因素、性能及前景

基于混凝和絮凝的调理技术由于其成本效益高、操作简单、效果好等优点，长期以来一直被用作提高污泥脱水性能的有效预处理方法。本文分别从污泥颗粒、絮凝性能和滤饼结构等方面系统阐述了影响最终脱水性能的七个关键因素。特别地，详细研究了基于混凝（污泥饼Wc， 57.7% ~ 81.6%）和絮凝（污泥饼Wc， 65.0% ~ 85.2%）的调理方法的最新进展，特别强调了混凝/絮凝联合使用作为协同调理策略（污泥饼Wc， 53.5% ~ 89.7%）。最后，对混凝/絮凝预处理技术面临的挑战和未来发展进行了讨论和展望。本文综述旨在为指导混凝/絮凝调理污泥脱水的应用和研究提供理论基础和技术见解。

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