Water Science & Technology: Water Supply Vol 7 No 3 pp 139–144 © IWA Publishing 2007 doi:10.2166/ws.2007.076
Biodegradability of Danube bank filtrate and its enhancement by ozonation
V.Z. Cukic* and V.L. Knezic**
*METAGO Engineering Services, South Africa (E-mail: zoran@metago.co.za)
**Professor Emeritus, University of Belgrade, School of Technology and Metallurgy, Serbia (E-mail: macak@eunet.yu)
ABSTRACT
The reduction of organic content through transformation processes in the Danube aquifer along a studied area, biodegradability of Danube bank filtrate and its enhancement by ozonation have all been examined in a study carried out in order to assess amenability of Danube bank filtrate for bio-filtration. As determined during the study period Dissolved Organic Carbon (DOC) varied from 4.6–6.5 mgC/L and from 2.8–3.7 mgC/L in Danube River and Danube bank filtrate respectively. As determined 11.2% of Danube bank filtrate DOC was bio-degradable. A substantial enhancement of biodegradability has been observed after the application of Ozone dosages ranging from 0.45 to 0.9 mgO3/ mgC. It was concluded that Danube bank filtrate itself is not amenable for bio-filtration but an enhancement of its bio-degradability by ozonation could make bio-filtration a reasonable and economical option for reducing of DOC content to the levels that provide low risk of excessive disinfection by-products formation and prevent bacterial re-growth in distribution networks of cities using Danube bank filtrate as the source water.
Keywords: Biodegradability; bio-filtration; Danube aquifer; Danube bank filtrate; ozonation
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