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Titolo:
Treatment of household wastewater using an intermittently aerated membranebioreactor
Autore:
Yeom, IT; Nah, YM; Ahn, KH;
Indirizzi:
Korea Inst Sci & Technol, Environm & Proc Technol Div, Seoul 130650, SouthKorea Korea Inst Sci & Technol Seoul South Korea 130650 oul 130650, SouthKorea
Titolo Testata:
DESALINATION
fascicolo: 1-3, volume: 124, anno: 1999,
pagine: 193 - 203
SICI:
0011-9164(19991101)124:1-3<193:TOHWUA>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVATED-SLUDGE PROCESS; CROSS-FLOW FILTRATION; WATER TREATMENT; NITROGEN REMOVAL;
Keywords:
membrane bioreactor; wastewater treatment; hollow-fiber membrane; nitrogen removal;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Yeom, IT Korea Inst Sci & Technol, Environm & Proc Technol Div, POB 131, Seoul 130650, South Korea Korea Inst Sci & Technol POB 131 Seoul South Korea 130650 Korea
Citazione:
I.T. Yeom et al., "Treatment of household wastewater using an intermittently aerated membranebioreactor", DESALINATN, 124(1-3), 1999, pp. 193-203

Abstract

An intermittently aerated membrane bioreactor using a submerged hollow fiber membrane was applied in laboratory scale to treat household wastewater including toilet flushing water. Nitrogen removal was optimized with intermittent aeration of the reactor and adjusting the time lengths of anoxic and aerobic phases of a cycle. Membrane filtration occurred during the aerationperiod to take advantage of the air bubbles for fouling control. With 8-15h HRT and a very long SRT, 96% of TCOD and 100% SS could be removed. On average, the removal efficiency for TN was 83%. No significant accumulation of inert matter was observed after 4 and 5 months of operations without sludge wasting. Fast and complete nitrification was accomplished regardless of the operation cycle mode, and denitrification appears to be the rate-limiting step. Results from track studies revealed that the specific denitrification rate (SDNR) varied between 0.6 and 1.8 mg/gVSS h. Endogenous SDNR was determined in a separate batch experiment and found to be 0.56 mg/gVSS.h. A linear relationship between the measured SDNR and the influent BOD/TN valuewas found. Based on this relationship, a rule-of-thumb method to determinethe optimum time length for the anoxic phase was proposed. Intermittently aerated MBR appears to have advantages over other biological nitrogen removal processes in that denitrification can be enhanced under high MLVSS conditions. Endogenous denitrification may pray a significant role, making the system more robust to the fluctuation or the limitation of external carbon supply.

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Documento generato il 29/03/20 alle ore 15:13:38