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- Title
Alternative cleaning method for ultrafiltration membrane system.
- Authors
Das, S.; Vila, S.; Jové, E.
- Abstract
Ultrafiltration membranes may face fouling problems if a proper cleaning strategy is not used. Therefore, a good cleaning strategy may help to maintain sustainable operation which will be reflected in constant flux production and no increase on transmembrane pressure. Typical cleaning combine mechanical cleaning strategies (backwash (BW), air scour (AS) and forward flush (FF)) and chemical cleanings (chemically enhanced backwash (CEB)) at regular intervals. This is sometimes followed by a more aggressive chemical cleaning which consist of cleaning in place (CIP) done at longer intervals. The current report describes an alternative cleaning strategy which consist of the complete elimination of CEBs and use of short CIPs at higher frequency in order to reduce filtrate water consumption and increase UF availability. First trial was performed at “The Dow Water and Process Solution Global Water Technology Center” in Tarragona, Spain and used Mediterranean sea water as feed. The second trial used waste water from urban waste water treatment plant in Vilaseca, Spain. Both trials showed that with the alternative cleaning protocol, DOW™ UF can maintain stable and sustainable operation over a long period of time. A comparative study with UF low Dow Software was done simulating a large scale facility of 100 UF modules in order to understand the benefit of alternative cleaning effect on large scale in terms of availability, recovery, efficiency and water consumption. Further evaluation indicated the following benefits of the alternative cleaning protocol compared to standard cleaning protocol: Around 9% higher total efficiency of the UF system; Approximately 5% higher net production of UF filtrate; Lower chlorination risk in reverse osmosis integrated systems as no chemical enhanced backwash is done; No ultrafiltration waste water generated, as no CEB is done.
- Subjects
TARRAGONA (Spain); SPAIN; WATER consumption; SEWAGE disposal plants; ULTRAFILTRATION; CHEMICAL cleaning; WATER efficiency; SEWAGE
- Publication
Desalination & Water Treatment, 2017, Vol 61, p222
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2016.11144