Issue 10, 2021

DOM removal is more important than the specific DOM removal pretreatment process for GAC adsorption of TrOCs

Abstract

Granular activated carbon (GAC) is an effective treatment technology for removing dissolved organic matter (DOM) and trace organic contaminants (TrOCs) from drinking water. However, higher DOM concentrations lead to earlier TrOC breakthrough because of competitive adsorption between them. As such, it is imperative to select an appropriate DOM removal pretreatment process. This study investigated the impact of three DOM removal pretreatment processes on the breakthrough of 29 TrOCs in a single raw water source by treating to the same average dissolved organic carbon (DOC) concentration of 2.1 to 2.2 mg L−1. The three pretreatment processes were (1) ozonation following by biofiltration and conventional treatment (O3/BF/C), (2) magnetic ion exchange following by conventional treatment (MIEX/C), and (3) conventional treatment alone (C). The effect of DOC concentration itself was also evaluated solely for O3/BF/C treated waters at average concentrations of 2.2, 2.9, and 3.8 mg L−1. Using GAC in rapid small-scale column tests, MIEX/C pretreatment resulted in DOM with the highest absorbability (latest breakthrough) followed by C then O3/BF/C. In terms of TrOC breakthrough, MIEX/C pretreatment resulted in earlier TrOC breakthrough at higher bed volumes but, on average, bed volumes to 10% TrOC breakthrough (BV10%,TrOC) were statistically the same between all pretreatments. Only the water with the highest DOC concentration, treated by O3/BF/C, resulted in lower BV10%,TrOC values on average. These results suggest that for high levels of TrOC removal by GAC, as defined by BV10%,TrOC values, influent DOC concentrations are more important than the specific DOM removal pretreatment process.

Graphical abstract: DOM removal is more important than the specific DOM removal pretreatment process for GAC adsorption of TrOCs

Article information

Article type
Communication
Submitted
02 जून 2021
Accepted
18 अगस्त 2021
First published
31 अगस्त 2021

Environ. Sci.: Water Res. Technol., 2021,7, 1707-1713

DOM removal is more important than the specific DOM removal pretreatment process for GAC adsorption of TrOCs

A. Kennedy, J. Hausmann, C. Corwin and R. S. Summers, Environ. Sci.: Water Res. Technol., 2021, 7, 1707 DOI: 10.1039/D1EW00375E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements