Effects of O3, O3/H2O2 and Coagulation on Natural Organic Matter and Arsenic Removal from Typical Northern Serbia Source Water

• Published in: Separation science and technology Vol. 45; no. 16; pp. 2453 - 2464
• Main Authors: Tubić, Aleksandra, Agbaba, Jasmina, Dalmacija, Božo, Rončević, Srđan, Klašnja, Mile, Ivančev-Tumbas, Ivana
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.11.2010
• Subjects: Arsenic; Coagulation; Effectiveness; Flocculating; Groundwater; natural organic matter; Ozone; Pilot plants; process; Surface chemistry; Serbia
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1080/01496395.2010.492376

The objectives of this study were to investigate the effects of ozone and the O 3 /H 2 O 2 process on FeCl 3 coagulation efficiency for the removal of the high content of natural organic matter (NOM) and arsenic (As) from groundwater (DOC = 9.27 ± 0.92 mg/L; 51.7 ± 16.4 µg As/L). Arsenic and NOM removal mechanisms during coagulation/flocculation are well investigated. However, data concerning arsenic removal in the presence of NOM, which is the subject of this article, are still insufficient. Laboratory and pilot plant test results have shown that the competition of NOM and As for adsorption sites on the coagulant surface have great influence on coagulation/flocculation efficiency for their removal. With both oxidation pre-treatments, arsenic content after the coagulation process was less than 2.0 µg/L in treated water. Application of ozone has a lower influence on coagulation efficacy in terms of DOC reduction, compared to the O 3 /H 2 O 2 process with the same ozone dose.