Adsorption and desorption processes of trihalomethanes on different granulated activated carbons in a full-scale advanced water treatment plant

Water Supply Pub Date : 2023-12-11 DOI:10.2166/ws.2023.324

Ana Urkiaga Guineao, Jonatan García, Julen Cabero, Santos Paunero, Mikel Bartolomé, L. M. Hernando, Patricia Maeso, Vanesa Benito

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Abstract

Trihalomethanes (THMs) are one of the main disinfection by-products generated in drinking water (DW). To control health risks caused by THMs several countries have established a maximum content of these chemicals in DW. THMs can be removed by activated carbon (AC) and their adsorption processes have been studied by different authors. However, there are few studies on their desorption from AC and no data are available on their desorption at a real scale. This paper summarises the results obtained in the monitoring of the adsorption and desorption processes of THMs at a full-scale DW plant considering different types and stages of ACs, as well as several types of influent waters. This research has been carried out during 3 years in a full-scale advanced DW plant (6.25 m3·h−1) that can use four different pre-oxidants. An increase on THMs concentration in the outlet of the AC filter due to desorption processes has been verified, although their doses have always been far below the established European limit (100 μg/L).

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全规模先进水处理厂中不同颗粒活性炭对三卤甲烷的吸附和解吸过程

三卤甲烷（THMs）是饮用水（DW）中产生的主要消毒副产品之一。为了控制三卤甲烷对健康造成的危害，一些国家规定了三卤甲烷在饮用水中的最高含量。活性炭（AC）可以去除三卤甲烷，不同学者对其吸附过程进行了研究。但是，关于三卤甲烷从活性炭中解吸的研究很少，也没有实际规模的解吸数据。本文总结了在一个完整规模的 DW 工厂对 THMs 的吸附和解吸过程进行监测所取得的结果，其中考虑到了不同类型和阶段的 AC 以及几种类型的进水。这项研究是在一个可使用四种不同预氧化剂的全规模先进脱水装置（6.25 m3-h-1）中进行的，历时三年。尽管三卤甲烷的剂量一直远远低于欧洲规定的限值（100 微克/升），但由于解吸过程，交流过滤器出口中三卤甲烷浓度的增加已得到证实。

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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Water Supply

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