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Titolo:
ANAEROBIC-DIGESTION OF PRIMARY SLUDGE FROM CHEMICAL PREPRECIPITATION
Autore:
GHYOOT W; VERSTRAETE W;
Indirizzi:
STATE UNIV GHENT,CTR ENVIRONM SANITAT,COUPURE L653 B-9000 GHENT BELGIUM
Titolo Testata:
Water science and technology
fascicolo: 6-7, volume: 36, anno: 1997,
pagine: 357 - 365
SICI:
0273-1223(1997)36:6-7<357:AOPSFC>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
WASTE-WATER; PHOSPHORUS REMOVAL; NUTRIENT REMOVAL; HYDROLYSIS;
Keywords:
ANAEROBIC DIGESTION; FERRIC CHLORIDE; PHOSPHORUS REMOVAL; PREPRECIPITATION; PRIMARY SLUDGE; SEWAGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
W. Ghyoot e W. Verstraete, "ANAEROBIC-DIGESTION OF PRIMARY SLUDGE FROM CHEMICAL PREPRECIPITATION", Water science and technology, 36(6-7), 1997, pp. 357-365

Abstract

Many existing wastewater treatment plants are to be upgraded for phosphorus removal. In our study, ferric chloride was used as a coagulant in pre-precipitation of municipal sewage. Using a Fe/P molar ratio of 0.8, removal efficiencies for suspended solids (64%), chemical oxygen demand (50%), Kjeldahl nitrogen (22%), total phosphorus (43%) and orthophosphate (51%) were obtained. Anaerobic digestion of raw primary sludge yielded a volatile solids (VS) destruction of 35% at VS loading rates of 0.60 to 0.79 kg VS/m(3).d. Digestion of chemically enriched primary sludge (CEP-sludge) yielded a VS destruction of 57% at a VS loading rate of 1.36 kgVS/m(3).d. Comparison of the methane production per kg VS destroyed (519 to 612 1 CH4/kgVS destroyed for primary sludge, 299 to 395 1 CH4/kgVS destroyed for CEP-sludge) evidenced a change in the composition of the organic material after precipitation with coagulants; the latter sludge was enriched in less reduced compounds. The precipitated phosphorus was not released to the supernatant during anaerobic digestion. No evidence for reduced digester stability was found for digestion of CEP-sludge. These results indicate that retro-fitting a plant by chemical pre-precipitation and subsequent anaerobic digestion of the CEP-sludge is a feasible option. (C) 1997 IAWQ. Published byElsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 11:19:39