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Titolo:
Reduction of biomass decay rate under anoxic and anaerobic conditions
Autore:
Siegrist, H; Brunner, I; Koch, G; Phan, LC; Le, VC;
Indirizzi:
Swiss Fed Inst Environm Sci & Technol EAWAG, CH-8600 Dubendorf, Switzerland Swiss Fed Inst Environm Sci & Technol EAWAG Dubendorf Switzerland CH-8600
Titolo Testata:
WATER SCIENCE AND TECHNOLOGY
fascicolo: 1, volume: 39, anno: 1999,
pagine: 129 - 137
SICI:
0273-1223(1999)39:1<129:ROBDRU>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVATED-SLUDGE SYSTEMS;
Keywords:
biomass decay; aerobic; anoxic; anaerobic; nitrification; hydrolysis; enhanced biological phosphorus elimination;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Siegrist, H Swiss Fed Inst Environm Sci & Technol EAWAG, CH-8600 Dubendorf, Switzerland Swiss Fed Inst Environm Sci & Technol EAWAG Dubendorf Switzerland CH-8600
Citazione:
H. Siegrist et al., "Reduction of biomass decay rate under anoxic and anaerobic conditions", WATER SCI T, 39(1), 1999, pp. 129-137

Abstract

The nitrification capacity of a nitrifying activated sludge which is not exposed to ammonium for several days is reduced by a significantly smaller amount if kept under anoxic and anaerobic rather than aerobic conditions, respectively. Since the enzyme system is not degraded as long as the micro-organisms are not in a starving state, this effect is probably due mainly to the anoxic and anaerobic biomass decay rate being smaller than the aerobic one. At 20 degrees C the decay rate of nitrification activity reduces from about 0.2 to 0.03 d(-1) from aerobic to anaerobic conditions, respectively. From these results it becomes clear that aeration has to be properly controlled to reduce biomass decay. Nitrate respiration is reduced by 35-40% as compared to aerobic heterotrophic respiration. This is probably due to the reduced anoxic decay rate of heterotrophic micro-organisms and only partly because of the reduced anoxic hydrolysis rate. (C) 1999 IAWQ Published by Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:01:56