Enhanced coagulation for removal of dissolved organic nitrogen in water: A review

IF 5.4 2区医学 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Biomaterials Science & Engineering Pub Date : 2024-10-01 DOI:10.1016/j.chemosphere.2024.143429

Yasha Jathan, Eric A. Marchand

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Abstract

Wastewater treatment plants (WWTPs) meeting strict nutrient discharge regulations typically effectively remove inorganic nitrogen, leaving dissolved organic nitrogen (DON) as the main component of total nitrogen in the effluent. DON in treated effluent from both WWTPs and drinking water treatment plants (DWTPs) has the potential to induce eutrophication and contribute to the formation of nitrogenous disinfection byproducts (N-DBP). While numerous studies have investigated DON in different water sources, a limited number of studies have focused on its removal through enhanced coagulation. The variable removal efficiencies of dissolved organic carbon (DOC) and DON in treatment processes highlight the need for comprehensive research on enhanced coagulation for DON removal. Enhanced coagulation is a viable option for DON removal, but underlying mechanisms and influencing factors are still being actively researched. The effectiveness of enhanced coagulation depends on DON characteristics and coagulant properties, but knowledge gaps remain regarding their influence on treatment. DON is a complex mixture of compounds, with only a small fraction identified, such as proteins, degraded amino acids, urea, chelating agents, humic substances, and soluble microbial products. Understanding molecular-level characteristics of DON is crucial for identifying unknown compounds and understanding its fate and transformation during treatment processes. This review identifies knowledge gaps regarding enhanced coagulation process for DON removal, including the role of coagulant aids, novel coagulants, and pretreatment options. It discusses DON characteristics, removal mechanisms, and molecular-level transformation of DON during enhanced coagulation. Addressing these gaps can lead to process optimization, promote efficient DON removal, and facilitate safe water production.

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增强混凝法去除水中的溶解有机氮：综述。

符合严格营养物排放规定的污水处理厂（WWTP）通常会有效去除无机氮，使溶解有机氮（DON）成为污水中总氮的主要成分。经污水处理厂和饮用水处理厂（DWTP）处理后的污水中的 DON 有可能导致富营养化并形成含氮消毒副产物（N-DBPs）。虽然已有大量研究对不同水源中的 DON 进行了调查，但通过强化混凝去除 DON 的研究数量有限。在处理过程中，溶解性有机碳 (DOC) 和 DON 的去除率各不相同，因此需要对强化混凝去除 DON 进行全面研究。强化混凝是去除 DON 的一种可行方法，但其基本机制和影响因素仍在积极研究之中。强化混凝的效果取决于 DON 的特征和混凝剂的特性，但在它们对处理的影响方面仍存在知识空白。DON 是一种复杂的化合物混合物，只有一小部分已被确认，如蛋白质、降解氨基酸、尿素、螯合剂、腐殖质和可溶性微生物产物。了解 DON 的分子级特征对于识别未知化合物以及了解其在处理过程中的归宿和转化至关重要。本综述指出了有关去除 DON 的强化混凝工艺的知识空白，包括混凝剂助剂的作用、新型混凝剂和预处理方案。它讨论了 DON 的特性、去除机制以及 DON 在强化混凝过程中的分子级转化。解决这些问题可以优化工艺，促进 DON 的高效去除，并促进安全水生产。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Biomaterials Science & Engineering Materials Science-Biomaterials

CiteScore

10.30

自引率

3.40%

发文量

413

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