Microbial removal and integrity monitoring of RO and NF membranes
JOURNAL AMERICAN WATER WORKS ASSOCIATION, cilt.95, sa.12, ss.105-119, 2003 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 95 Sayı: 12
- Basım Tarihi: 2003
- Dergi Adı: JOURNAL AMERICAN WATER WORKS ASSOCIATION
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.105-119
- Süleyman Demirel Üniversitesi Adresli: Hayır
Özet
This research investigated the integrity of reverse osmosis (RO) and nanofiltration (NF) membrane systems with respect to microbial passage using microbial (bacteriophage MS2 viruses) and nonmicrobial (Rhodamine WT [RWT] dye and fluorescent-dyed polyslyrene microspheres) surrogates. Pilot-scale experiments were conducted with microfiltered secondary wastewater effluent and conventional process-treated surface water. Microspheres were a more accurate predictor of MS2 removal; however, RWT showed good correlation, particularly for RO. NF and RO elements compromised via a membrane pinhole showed reduced removals for all surrogates, whereas subsequent operation of such elements increased surrogate removal (through membrane fouling). This increase was reversible by chemical cleaning for element; operated on effluent but less so for surface water. Compromising RO system integrity using cut O-rings did not increase surrogate passage. Passage increased only when sections of the O-rings were removed. The impact on integrity of such an O-ring compromise was dependent on location in the RO/NF system.