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Titolo:
PRIMARY SLUDGE HYDROLYSIS FOR BIOLOGICAL NUTRIENT REMOVAL
Autore:
HATZICONSTANTINOU GJ; YANNAKOPOULOS P; ANDREADAKIS A;
Indirizzi:
EYDAP,PSYTTALIA WWTP ATHENS 18756 GREECE NATL TECH UNIV ATHENS,WATER RESOURCES DEPT ATHENS 15780 GREECE
Titolo Testata:
Water science and technology
fascicolo: 1-2, volume: 34, anno: 1996,
pagine: 417 - 423
SICI:
0273-1223(1996)34:1-2<417:PSHFBN>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON;
Keywords:
HYDROLYSIS; PRIMARY SLUDGE; FERMENTER; SOLUBLE CARBON; NUTRIENT REMOVAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
5
Recensione:
Indirizzi per estratti:
Citazione:
G.J. Hatziconstantinou et al., "PRIMARY SLUDGE HYDROLYSIS FOR BIOLOGICAL NUTRIENT REMOVAL", Water science and technology, 34(1-2), 1996, pp. 417-423

Abstract

Primary sludge hydrolysis can enrich primary effluent with the soluble organics which in turn can be a valuable carbon source to subsequentnutrient removal processes. By controlling hydraulic retention time and temperature it is possible to confine the anaerobic digestion of the primary sludge to the acidogenic and acetogenic phase (hydrolysis/fermentation process), and take advantage of the soluble organics produced. This paper presents the results of a research involving bench and pilot scale experiments related to primary sludge hydrolysis. The pilot scale sedimentation tank (4.10 m in diameter, 3.20 m in depth) operated over an expended period of 21 months as a conventional clarifier and following this as a fermenter unit employing sludge recirculation. Parallel to the pilot scale experiments, several batch and continuous flow bench scale experiments were conducted in order to determine the factors controlling the production of soluble organics and the effect of the tatter on the denitrification process. The conclusions drawn were that a) a soluble COD production of the order of 5-6% in terms of sludge TCOD can be expected in a batch fermenter operating with HRT congruent to 2 days at T less than or equal to 20 degrees C, b) in a continuous flow fermenter, combinations of T > 20 degrees C and SRT > 2 should be applied in order to achieve a production of the order of 10%, c) significant soluble carbon production can be achieved in primary sedimentation tanks (over 30% in terms of influent SCOD) when relativelyincreased SRTs (4 to 5 days) in combination with sludge recirculationare employed, under T > 22 degrees C, and d) increased denitrification performance of the order of 9 mgNOx/g MLSS.hr, can be achieved with hydrolysate as a carbon source. Copyright (C) 1996 IAWQ.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 10:25:46