The fate and impact of coagulants/flocculants in sludge treatment systems,Environmental Science: Water Research & Technology

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The fate and impact of coagulants/flocculants in sludge treatment systems
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-6-1 , DOI: 10.1039/d1ew00165e
Qizi Fu _{1,

2} , Xuran Liu _{1,

2} , Yanxin Wu _{1,

2} , Dongbo Wang _{1,

2} , Qiuxiang Xu _{1,

2} , Jingnan Yang _{1,

2}

Affiliation

Coagulants and flocculants have been widely used in various applications, especially in wastewater treatment and sludge dewatering, which result in their high accumulation in waste-activated sludge (WAS). In the past years, the fate and impact of coagulants/flocculants in WAS anaerobic treatment have been extensively studied. Many efforts have been made to explore their effects on WAS anaerobic treatment performance, reveal the underlying mechanism, and establish regulation methods. To date, however, no efforts have systematically summarized or critically considered the fate and impact of coagulants/flocculants in WAS anaerobic treatment systems. In this work, the use and distribution of flocculants/coagulants in wastewater collection and treatment system are summarized, the presence of coagulants/flocculants promoted the formation of large sludge floc, increased the mass transfer resistance of WAS anaerobic treatment, hindered the release of organics from the solid sludge to the liquid phase, and inhibited some related bioprocesses, thus reducing the WAS anaerobic treatment efficiency. In addition, the fates of coagulants/flocculants in anaerobic systems are also clarified, and the regulation strategies (e.g., pH adjustment) to mitigate the harmful effects are analyzed. Herein, the opportunities and challenges of coagulants/flocculants applied in wastewater and sludge treatment systems are rethought, and further research perspectives are put forward.

中文翻译：

污泥处理系统中混凝剂/絮凝剂的归宿和影响

混凝剂和絮凝剂已广泛用于各种应用，特别是在废水处理和污泥脱水中，这导致它们在废物活性污泥 (WAS) 中的大量积累。在过去几年中，WAS 厌氧处理中混凝剂/絮凝剂的归宿和影响已得到广泛研究。已经进行了许多努力来探索它们对 WAS 厌氧处理性能的影响，揭示其潜在机制并建立调节方法。然而，迄今为止，还没有系统总结或批判性地考虑凝结剂/絮凝剂在 WAS 厌氧处理系统中的命运和影响。在这项工作中，总结了絮凝剂/混凝剂在废水收集和处理系统中的使用和分配，混凝剂/絮凝剂的存在促进了大污泥絮体的形成，增加了WAS厌氧处理的传质阻力，阻碍了有机物从固体污泥向液相的释放，并抑制了一些相关的生物过程，从而降低了WAS厌氧处理效率。此外，还明确了厌氧系统中混凝剂/絮凝剂的去向，以及调控策略（例如，pH 调节）以减轻有害影响。在此，重新思考了混凝剂/絮凝剂在废水和污泥处理系统中应用的机遇和挑战，并提出了进一步的研究前景。

更新日期：2021-06-21

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