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Titolo:
COUPLING MEMBRANE FILTRATION TO ANAEROBIC PRIMARY SLUDGE-DIGESTION
Autore:
GHYOOT WR; VERSTRAETE WH;
Indirizzi:
STATE UNIV GHENT,CTR ENVIRONM SANITAT,COUPURE L 653 B-9000 GHENT BELGIUM STATE UNIV GHENT,CTR ENVIRONM SANITAT B-9000 GHENT BELGIUM
Titolo Testata:
Environmental technology
fascicolo: 6, volume: 18, anno: 1997,
pagine: 569 - 580
SICI:
0959-3330(1997)18:6<569:CMFTAP>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN REMOVAL; WASTE-WATER; SCALE; PHOSPHORUS; LIQUOR; SYSTEM;
Keywords:
ANAEROBIC DIGESTION; MICROFILTRATION; PRIMARY SLUDGE; SLUDGE TREATMENT; ULTRAFILTRATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
W.R. Ghyoot e W.H. Verstraete, "COUPLING MEMBRANE FILTRATION TO ANAEROBIC PRIMARY SLUDGE-DIGESTION", Environmental technology, 18(6), 1997, pp. 569-580

Abstract

Anaerobic digesters are widely employed at wastewater treatment worksfor the destruction of volatile solids present in settled primary andwaste activated sludge. Membrane separation techniques afford an effective method to separate solids from the digester suspension and recycle them to the digester. A commercially available polymer ultrafiltration and ceramic microfiltration membrane were tested for filtration ofanaerobic sludge. For the filtration of suspensions with similar solids concentrations, the short term fluxes reached in ceramic microfiltration (200 tot 250 l m(-2) h(-1)) were on the average tenfold those for polymer ultrafiltration (25 l m(-2) h(-1)). The permeate quality of the ceramic microfiltration and polymer ultrafiltration was similar. Discontinuous coupling of the ceramic microfiltration to an anaerobic primary sludge digester increased the total solids concentration of thereactor from 22 g l(-1) to 35 g l(-1), but the reactor efficiency wasnot improved in terms of volumetric loading rates. The high frequencyof displacement of the anaerobic sludge through the filtration unit disrupted the interaction between the different species in the anaerobic consortia due to shear stress. Ceramic microfiltration of digested sludge was estimated to represent an extra cost of 1.53 ECU (57.2 BEF) m(-3) permeate compared to polymer ultrafiltration. In line implementation of membrane filtration in sludge digestion is not recommended in terms of improved microbial process performance. However, coupling membrane filtration to the final treatment of the digested liquor by polymer ultrafiltration or ceramic microfiltration opens perspectives because high fluxes can be achieved and a high quality permeate is produced.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 10:51:58