Exploration of the possibilities of UF [ultra-filtration] as an alternative pre-treatment step for drinking water production
2000
Doyen, W. (Flemish Inst. for Technological Research, Mol (Belgium)) | Beeussaert, L. | Baee, B.
This paper describes the research in charge of the Flemish Centre for Water Research and Cooperation of Flanders (SVW), which groups joint water research of all drinking water companies of Flanders. The membrane research project focuses on the exploration of the use of open UF [ultra-filtration], as an alternative for conventional separation technologies for drinking water production. Four different water types, originating from three water sources (Canal Albert in the province of Antwerp, canal Isabella and local small rivers in East Flanders province and river Dijle water of Flemish Brabant province) were investigated. Four "open" UF membranes were used, of which three were in hollow fibre configuration and only one single was in tubular configuration. It was found on one hand that permeate quality was always very good in comparison with conventional techniques. No bacteria, no suspended solids, nor turbidity were present. Moreover, quality was independent from operational conditions, or from membrane type. On the other hand, it was found that operational conditions strongly differ from used raw water quality or from used membrane type. Especially in the cases where raw water from canal Isabella was used, containing high amount of low molecular weight components or when more hydrophobic membrane was being used it was hard to find stable operational condition. By introducing a coagulation step with FeCl3 prior to UF, mentioned problems could be overcome to a large extent. Moreover it was found that in this way also flux level and water recovery could be optimised.
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