Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The role of sludge retention time in the hydrolysis and acidification of lipids, carbohydrates and proteins during digestion of primary sludge in CSTR systems
Autore:
Miron, Y; Zeeman, G; Van Lier, JB; Lettinga, G;
Indirizzi:
Wageningen Univ Agr, Dept Agr Environm & Syst Technol, Subdept Environm Technol, NL-6700 EV Wageningen, Netherlands Wageningen Univ Agr Wageningen Netherlands NL-6700 EV ingen, Netherlands
Titolo Testata:
WATER RESEARCH
fascicolo: 5, volume: 34, anno: 2000,
pagine: 1705 - 1713
SICI:
0043-1354(200004)34:5<1705:TROSRT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANAEROBIC-DIGESTION; FATTY-ACIDS; PHASE; WATER;
Keywords:
acidification; carbohydrates; dewaterability; domestic sewage; hydrolysis; lipids; primary sludge; proteins; rate limiting step; SRT; two steps; UASB;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Zeeman, G Wageningen Univ Agr, Dept Agr Environm & Syst Technol, Subdept Environm Technol, POB 8129, NL-6700 EV Wageningen, Netherlands Wageningen Univ Agr POB 8129 Wageningen Netherlands NL-6700 EV
Citazione:
Y. Miron et al., "The role of sludge retention time in the hydrolysis and acidification of lipids, carbohydrates and proteins during digestion of primary sludge in CSTR systems", WATER RES, 34(5), 2000, pp. 1705-1713

Abstract

The effect of the sludge retention time (SRT) between 3 and 15 days, on hydrolysis, acidification and methanogenesis of domestic sewage was researched by simulating a sludge bed segment of an upflow anaerobic sludge bed (UASB) system as a completely stirred rank reactor (CSTR). The CSTR systems were fed with primary sludge (settled solids of domestic sewage) as the influent at 25 degrees C, The study revealed that an SRT less than or equal to 8 days resulted in acidogenic conditions with negligible biogas production, whereas an SRT > 8 days resulted in methanogenic conditions. The hydrolysis of lipids and carbohydrates increased with increasing SRT, whereas protein hydrolysis only occurred under methanogenic conditions. Approximately 20 and 60% of the particulate biopolymers are hydrolysed under acidogenic and methanogenic conditions, respectively. Hydrolysis was found to be the fate-limiting step for the conversion of carbohydrates. Under acidogenic conditions, acidification was the rate-limiting step for conversion of lipids, whileboth hydrolysis and acidification were limiting for the conversion of proteins. Under methanogenic conditions, hydrolysis was the rate-limiting step in the whole digestion process. None of the main components of primary sludge followed first order kinetics with respect to hydrolysis. The dewaterability of the sludges from the CSTRs operated under acidogenic conditions deteriorated, whereas the dewaterability of the methanogenic sludge improved in comparison with the dewaterability of the raw primary sludge. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/09/20 alle ore 10:32:16