Combination of coagulation and ultrafiltration for drinking water production: impact of process configuration and module design

The in-line coagulation/ultrafiltration (UF) combined process has been studied in order to improve membrane performance for the treatment of surface water with high organic content. Ultrafiltration experiments were performed using cellulose derivative hollow-fibre membranes with ferric chloride as c...

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Bibliographic Details
Published in:Water science & technology. Water supply 2001-01, Vol.1 (5-6), p.107-118
Main Authors: Guigui, C, Bonnelye, V, Durand-Bourlier, L, Rouch, J C, Aptel, P
Format: Article
Language:English
Subjects:
Adsorption
Backwash
Bleeding
Cellulose
Cellulose fibers
Coagulants
Coagulation
Cross flow
Drinking water
Efficiency
Experiments
Ferric chloride
Filtration
Fluctuations
Fluid dynamics
Fluid flow
Flux
Fouling
Hollow fiber membranes
Membranes
Penetration
Recovery
Reynolds number
Surface water
Ultrafiltration
Vortices
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Summary:The in-line coagulation/ultrafiltration (UF) combined process has been studied in order to improve membrane performance for the treatment of surface water with high organic content. Ultrafiltration experiments were performed using cellulose derivative hollow-fibre membranes with ferric chloride as coagulant. The efficacy of adding coagulant just before the membrane module depends on the filtration mode, the process configuration and the module design. In dead-end mode, permeation flux of 70 l/hm2 can be maintained, but high backwash frequency (low recovery) is necessary to prevent plugging. Cross-flow filtration was effective in reducing fouling and allows operation at higher permeation flux. In cross-flow filtration, the feed-and-bleed configuration (single stage continuous process) appears promising to reduce backwash frequencies: for a recovery of 95% and at a permeation flux of 120 l/h.m2, quasi-steady transmembrane pressure can be maintained with a low fouling rate (10 kPa in 400 min.). In cross-flow filtration, the use of curved modules with Dean vortices reduces the fouling rate by a factor of 2 compared with a conventional straight module.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2001.0105