Microfiltration membrane plant start up : a case study with autopsy and permeability recovery analysis
A potable water treatment plant, supplied from a low NOM (natural organic matter), low turbidity source with precoagulation and two-stage pressure sand filtration, had a MF (microfiltration) membrane process added to meet UK Water Regulations. An autopsy of the membrane modules showed that despite u...
| Veröffentlicht in: | Environmental technology. - 1993. - 30(2009), 6 vom: 15. Mai, Seite 629-39 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2009
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| Zugriff auf das übergeordnete Werk: | Environmental technology |
| Schlagworte: | Journal Article Membranes, Artificial |
| Zusammenfassung: | A potable water treatment plant, supplied from a low NOM (natural organic matter), low turbidity source with precoagulation and two-stage pressure sand filtration, had a MF (microfiltration) membrane process added to meet UK Water Regulations. An autopsy of the membrane modules showed that despite upstream coagulation/filtration with chlorination, a biofilm of EPS (extracellular polymeric substances) and inorganic particulates had developed. Backwashing under laboratory conditions yielded an almost full recovery. Laboratory-scale modules of fouled fibres from pre-commissioning and post-commissioning were assembled and cleaned. The recovery was modelled and optimized with a response surface experiment using variables of concentration, soak period and temperature. The pre-commissioning fibres were more recovered by longer chemical soak times at higher cleanant concentrations than the post-commissioning fibres. Comparative tests on post-commissioning fibres indicated that full recovery was possible with organic acids. It was concluded that start-up of new membrane plants may involve fouling conditions not necessarily representative of those under routine operating conditions, such that modification to prescribed cleaning operations may be required |
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| Beschreibung: | Date Completed 06.08.2009 Date Revised 16.07.2009 published: Print Citation Status MEDLINE |
| ISSN: | 1479-487X |
| DOI: | 10.1080/09593330902849467 |