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Dissolved Mn(III) in Water Treatment Works: Prevalence and Significance

Johnson, K.L.; McCann, C.M.; Wilkinson, J.L.; Jones, M.; Tebo, B.M.; West, M.; Elgy, C.; Clarke, C.E.; Gowdy, C.; Hudson-Edwards, K.A.

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Authors

C.M. McCann

J.L. Wilkinson

M. Jones

B.M. Tebo

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Martin West m.d.west@durham.ac.uk
Senior Analytical Experimental Officer

C. Elgy

C.E. Clarke

C. Gowdy

K.A. Hudson-Edwards



Abstract

Dissolved Mn(III) has been identified at all stages throughout a Water Treatment Works (WTW) receiving inflow from a peaty upland catchment in NE England. Ninety percent of the influent total manganese into the WTW is particulate Mn, in the form of Mn oxide (>0.2 μm). Approximately 9% (mean value, n = 22, range of 0–100%) of the dissolved (<0.2 μm) influent Mn is present as dissolved Mn(III). Mn(III) concentrations are highest (mean of 49% of total dissolved Mn; n = 26, range of 17–89%) within the WTW where water comes into contact with the organic-rich sludges which are produced as waste products in the WTW. These Mn(III)-containing wastewaters are recirculated to the head of the works and constitute a large input of Mn(III) into the WTW. This is the first report of Mn(III) being identified in a WTW. The ability of Mn(III) to act as both an oxidant and a reductant is of interest to the water industry. Understanding the formation and removal of Mn(III) within may help reduce Mn oxide deposits in pipe networks. Further understanding how the ratio of Mn(III) to Mn(II) can be used to optimise dissolved Mn removal would save the water industry significant money in reducing discoloration ‘events’ at the customers' tap.

Citation

Johnson, K., McCann, C., Wilkinson, J., Jones, M., Tebo, B., West, M., …Hudson-Edwards, K. (2018). Dissolved Mn(III) in Water Treatment Works: Prevalence and Significance. Water Research, 140, 181-190. https://doi.org/10.1016/j.watres.2018.04.038

Journal Article Type Article
Acceptance Date Apr 17, 2018
Online Publication Date Apr 17, 2018
Publication Date Sep 1, 2018
Deposit Date Apr 16, 2018
Publicly Available Date Mar 28, 2024
Journal Water Research
Print ISSN 0043-1354
Publisher IWA Publishing
Peer Reviewed Peer Reviewed
Volume 140
Pages 181-190
DOI https://doi.org/10.1016/j.watres.2018.04.038

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