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Titolo:
Effect of backflushing conditions on ultrafiltration of board industry wastewaters with ceramic membranes
Autore:
Laitinen, N; Luonsi, A; Levanen, E; Nystrom, M;
Indirizzi:
Lappeenranta Univ Technol, Lab Membrane Technol & Tech Polymer Chem, Lappeenranta 53851, Finland Lappeenranta Univ Technol Lappeenranta Finland 53851 anta 53851, Finland Pirkanmaa Reg Environm Ctr, Tampere 33101, Finland Pirkanmaa Reg Environm Ctr Tampere Finland 33101 Tampere 33101, Finland Tampere Univ Technol, Inst Mat Sci, FIN-33101 Tampere, Finland Tampere Univ Technol Tampere Finland FIN-33101 IN-33101 Tampere, Finland
Titolo Testata:
SEPARATION AND PURIFICATION TECHNOLOGY
fascicolo: 1-3, volume: 25, anno: 2001,
pagine: 323 - 331
SICI:
1383-5866(20011001)25:1-3<323:EOBCOU>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
CROSS-FLOW MICROFILTRATION; FLUX ENHANCEMENT; FOULING CONTROL; FILTRATION; WATER; OPTIMIZATION; PURIFICATION;
Keywords:
backflushing; board mill; ceramic membrane; wastewater;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Laitinen, N Lappeenranta Univ Technol, Lab Membrane Technol & Tech PolymerChem, POB 20, Lappeenranta 53851, Finland Lappeenranta Univ Technol POB 20Lappeenranta Finland 53851 d
Citazione:
N. Laitinen et al., "Effect of backflushing conditions on ultrafiltration of board industry wastewaters with ceramic membranes", SEP PURIF T, 25(1-3), 2001, pp. 323-331

Abstract

The increased environmental awareness and stringent legislation are forcing the pulp and paper mills to reduce their water consumption. This can be achieved by recycling the waters both internally and externally. Membrane technologies offer one possibility to further improve the quality of the wastewater. In this study, a new type of ceramic membrane was used to ultrafilter a biologically treated combined board mill wastewater. The flat membranewas made of alpha -alumina and it was modified with titania. The mean poresize of the membranes was 100 nm. Backflushing was used as a means to improve the permeate flux. Earlier tests have shown that backflushing can improve the flux with 11-28% when done for 1 s every minute at a pressure of four bar from the permeate side. The decrease observed in retentions of major quality parameters (suspended solids, turbidity and CODCr) was only about 5%. The effect of different backflushing parameters on flux and retentions will be described in this paper. The parameters studied were backflushing frequency, length of the backflush, and the backflushing pressure. The results show that the best permeate flux was obtained,when backflushing was made for I s every 2 min at a pressure of four bar from the permeate side. From the parameters studied the length of the pulse was the most important factor affecting the permeate flux. The second most important factor was the backflushing frequency. The effect of backflushing pressure was not as obvious, but at least in these cases the decrease in backflushing pressure increased the permeate flux. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 23:43:44