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Investigation of metaldehyde removal by powdered activated carbon from different water samples

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Abstract

Metaldehyde as a widely used pesticide has been detected in surface water and drinking water in the UK with concentrations higher than the EU and UK standard (0.1 μg L−1). Previous studies have shown that powdered activated carbon (PAC) can adsorb metaldehyde even with the presence of natural organic matter, suggesting a promising solution to the problem. This paper studies the adsorption of metaldehyde onto PAC using different water samples including synthetic water, natural surface water, and water samples taken at different treatment processes from a water treatment plant. Metaldehyde (5 μg L−1) was effectively removed by PAC (50 mg L−1) from all water samples in this study, regardless of the water quality (74.3% to 99.7%). A PAC dosage of 100 mg L−1 was considered appropriate to remove metaldehyde at 5 μg L−1 after the first treatment process of pre-ozone treatment with a maximum adsorption capacity (qm) of 0.25 μg mg−1 given by the data fitted to the Langmuir isotherm model. Removal of metaldehyde by PAC was found to be most effective when PAC was applied after the static flocculation treatment process (98.4%) with a qm of 0.29 μg mg−1. The low adsorption capacity of PAC for low initial concentrations of metaldehyde solution was observed due to the lower driving force for mass transfer in the process of adsorption and competition with water molecules for adsorption sites on PAC.

Graphical abstract: Investigation of metaldehyde removal by powdered activated carbon from different water samples

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Supplementary files

Article information


Submitted
29 Oct 2019
Accepted
18 Mar 2020
First published
19 Mar 2020

This article is Open Access

Environ. Sci.: Water Res. Technol., 2020, Advance Article
Article type
Paper

Investigation of metaldehyde removal by powdered activated carbon from different water samples

Z. Li, J. Li, Z. Guo and L. C. Campos, Environ. Sci.: Water Res. Technol., 2020, Advance Article , DOI: 10.1039/C9EW00962K

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