Laboratory Assessment of Ferrate for Drinking Water Treatment

A laboratory assessment of ferrate (Fe(VI)) for drinking water treatment was conducted, including batch and continuous flow experiments on natural water samples. In batch experiments, ferrate preoxidation enhanced the removal of ultraviolet light-absorbing compounds (UV254; absorbance at 254 nm) by...

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Bibliographic Details
Published in:Journal - American Water Works Association 2016-03, Vol.108 (3), p.E164-E173
Main Authors: Goodwill, Joseph E., Jiang, Yanjun, Reckhow, David A., Tobiason, John E.
Format: Article
Language:English
Subjects:
Coagulation
Continuous flow
disinfection by‐products
Drinking water
drinking water treatment
Experiments
ferrate
Iron
Laboratories
organic carbon
Oxidation
preoxidation
Raw water
Turbidity
Ultraviolet radiation
Water analysis
Water flow
Water quality
Water sampling
Water Treatment
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Summary:A laboratory assessment of ferrate (Fe(VI)) for drinking water treatment was conducted, including batch and continuous flow experiments on natural water samples. In batch experiments, ferrate preoxidation enhanced the removal of ultraviolet light-absorbing compounds (UV254; absorbance at 254 nm) by subsequent coagulation in some water samples, while some samples showed no improvement. Ferrate oxidation was not found to have negative impacts on subsequent coagulation. In continuous flow experiments, ferrate preoxidation improved finished water turbidity, UV254 absorbance, and disinfection by-product formation as compared with no preoxidation and to preoxidation with permanganate. However, improvements were similar in magnitude to those achieved by adding the same mass of ferric iron in place of ferrate prior to a formal coagulation step, in one water study. Particulate iron resulting from Fe(VI) reduction was effectively destabilized and removed via coagulation and filtration. Ferrate may be a viable technology for drinking water treatment depending on raw water quality and treatment goals.
ISSN:0003-150X
1551-8833
DOI:10.5942/jawwa.2016.108.0029