ORIGINAL ARTICLE
Effect of Organic Substances on the Efficiency of Fe(Ii) to Fe(Iii) Oxidation and Removal of Iron Compounds from Groundwater in the Sedimentation Process
1
University of Zielona Gora, Faculty of Civil and Environmental Engineering Institute of Environmental Engineering, Szafrana st 15, 65-246 Zielona Góra, Poland
Online publication date: 2017-11-18
Publication date: 2017-09-26
Civil and Environmental Engineering Reports 2017;26(3):15-29
KEYWORDS
groundwater treatmentorganic substancesaerationpotassium manganate (VII)Fe(II) oxidationremoval of iron
ABSTRACT
One of the problems with iron removal from groundwater is organic matter. The article presents the experiments involved groundwater samples with a high concentration of total iron - amounting to 7.20 mgFe/dm3 and an increased amount of organic substances (TOC from 5.50 to 7.50 mgC/dm3). The water samples examined differed in terms of the value of the ratio of the TOC concentration and the concentration of total iron (D). It was concluded that with increase in the coexistence ratio of organic substances and total iron in water (D = [TOC]/[Fetot]), efficiency of Fe(II) to Fe(III) oxidization with dissolved oxygen decreased, while the oxidation time was increasing. This rule was not demonstrated for potassium manganate (VII) when used as an oxidizing agent. The application of potassium manganate (VII) for oxidation of Fe(II) ions produced the better results in terms of total iron concentration reduction in the sedimentation process than the oxidation with dissolved oxygen.
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