Reducing disinfection byproduct precursors through coagulation enhancement as particle weight and size control using potassium permanganate

The widespread use of chlorine pre-oxidation in water purification has been limited in several countries owing to the production of carcinogenic byproducts when combined with naturally occurring organic matter. This study investigates the efficient use of potassium permanganate (KMnO ) pretreatment...

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Bibliographic Details
Published in:Journal of water and health 2023-01, Vol.21 (1), p.1-8
Main Authors: Bayomi, Ahmed M, Souaya, Eglal R, Ismail, Eman H, Mohamed, Gehad G, Hussein, Mahmoud Mohamed Fouad
Format: Article
Language:English
Subjects:
Acidic oxides
Adsorption
Aluminium
Aluminum
Aluminum sulfate
Byproducts
Carcinogens
Chlorine
Chromatography
Coagulants
Coagulation
coagulation enhancement
Disinfection
Drinking water
Efficiency
gel permeation chromatography
humic acid reduction
Humic acids
Manganese
Manganese Compounds
Manganese dioxide
Molecular weight
Molecular weight distribution
Organic matter
Oxidation
Oxidation-Reduction
Oxides
Particle size
particle size analysis
Potassium
Potassium Permanganate
Pretreatment
Reduction
Sedimentation & deposition
Surface water
Water Purification
Water treatment
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Summary:The widespread use of chlorine pre-oxidation in water purification has been limited in several countries owing to the production of carcinogenic byproducts when combined with naturally occurring organic matter. This study investigates the efficient use of potassium permanganate (KMnO ) pretreatment and coagulation enhancement as particle size and molecular weight distribution controlling parameters. KMnO pretreatment significantly reduced the apparent molecular weight of humic acid due to KMnO reduction and the continuous generation of manganese dioxide (MnO ) formed in situ under neutral and alkaline conditions. The MnO formed in situ had adsorption characteristics that enabled it to form large and stable flocs with the hydrolysis products of aluminum sulfate. However, under acidic conditions, KMnO pretreatment exhibited strong oxidation characteristics due to Mn(VII) reduction to Mn(II), and the mean particle floc size was the same as without KMnO pretreatment. Overall, KMnO pretreatment is a useful alternative strategy for traditional pre-oxidation using chlorine and a good coagulant enhancement agent in neutral and basic media.
ISSN:1477-8920
1996-7829
DOI:10.2166/wh.2022.143