DBPapers
DOI: 10.5593/SGEM2016/B31/S12.020

CHLORINE DIOXIDE DISINFECTION OF DRINKING WATER: INSTALLATIONS AND PRACTICES IN RUSSIA

T. Krupnova, A. Kostryukova, I. Mashkova, E. Schelkanova, N. Yakupova
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-61-2 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 1, 145-152 pp

ABSTRACT
Low drinking water quality standards may be explained by inefficient water treatment technology, the use of outdated chemicals as disinfectants and secondary water pollution during its transportation to the ultimate consumer via the poor quality water supply systems. The paper describes chlorine dioxide disinfection technology with the help of DCh-100 at drinking water treatment plant with capacity of 45600 m3/day. DCh-100 type automated unit is made in Russia. The DCh-100 local automated plant producing a highly efficient and economical “Chlorine Dioxide and Chlorine” Compound Disinfectant from readily-available raw materials (sodium chlorate, sodium chloride, and sulfuric acid) for drinking water treatment and disinfection. The optimal chlorine dioxide dosing was identified: 1) During primary chlorination at the stage of pretreatment oxidation (chlorine was used for secondary disinfection). The dose of chlorine dioxide was 0.43–0.85 mg/l at the research season. 2) During two-stage scheme of water disinfection. Chlorine dioxide was used for pretreatment oxidation and secondary disinfection. The dose of chlorine dioxide was 0.30–0.40 mg/l for pretreatment oxidation and 0.15–0.20 mg/l for secondary disinfection process. 3) During one-stage disinfection. The dose of chlorine dioxide 0.26–0.33 mg/l was chosen. For the given disinfecting modes the optimal dosing of coagulants and flocculants was identified.

Keywords: drinking water, disinfection, chlorine dioxide, water treatment plant, optimal dose.