DBPapers
DOI: 10.5593/SGEM2016/B31/S12.004

A STUDY ON THE USE OF IRON RICH DRINKING WATER TREATMENT SLUDGE TO REMOVE ORTHOPHOSPHATE FROM WASTEWATER

T. Krupnova, A. Kostryukova, I. Mashkova, Y. Akhmetova
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, 25-30 pp

ABSTRACT
During drinking water treatment iron is removed from groundwater. This results in large amounts of iron rich sludge, laid down at drinking water plants in Russia. This paper describes possible re-use of iron rich sludge for treatment of municipal wastewater. We studied water treatment sludge which is remained after the production of drinking water in the city of Uchaly (the Republic of Bashkortostan, Russia). The drinking water treatment plant was put into operation in 2001 to compensate for the shortage of drinking water in the town. Water treatment sludge is currently stored into the solid waste landfill or the sewage sludge of treatment facilities. 22.733 tonnes of iron rich sludge a year is produced in the process of drinking water production. We suggest centrifugalizing the sludge with its further drying. Annually it will allow to get 0.91 tonnes of a sludge containing 75 % of dry matter. X-ray fluorescence analysis was used to determine the chemical composition of water treatment sludge. The diagrams of thermal analysis were studied. The orthophosphate removal process was studied using model solutions. The maximum percent orthophosphate removal was 80 %. The study of sorption isotherm proves that it is governed by Langmuir equation. It has been shown that dry sludge can be used to remove orthophosphates from the municipal wastewater.

Keywords: Drinking water treatment sludge (DWTS), iron rich sludge, drinking water treatment plant (DWTP), orthophosphate removal, adsorption, wastewater treatment.