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Titolo:
Evaluation of the parameters affecting nitrogen and phosphorus removal in anaerobic/anoxic/oxic (A/A/O) biological nutrient removal systems
Autore:
Mulkerrins, D; Jordan, C; McMahon, S; Colleran, E;
Indirizzi:
Natl Univ Ireland Univ Coll Galway, Dept Microbiol, Galway, Ireland Natl Univ Ireland Univ Coll Galway Galway Ireland biol, Galway, Ireland
Titolo Testata:
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
fascicolo: 4, volume: 75, anno: 2000,
pagine: 261 - 268
SICI:
0268-2575(200004)75:4<261:EOTPAN>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEQUENCING BATCH REACTOR; ACTIVATED-SLUDGE PROCESS; WASTE-WATER; PHOSPHATE; POPULATION;
Keywords:
biological phosphorus removal; anaerobic/anoxic/oxic conditions; nitrate; denitrifying phosphate removing bacteria (DPB); internal recycle; secondary phosphorus release;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Colleran, E Natl Univ Ireland Univ Coll Galway, Dept Microbiol, Galway, Ireland Natl Univ Ireland Univ Coll Galway Galway Ireland , Ireland
Citazione:
D. Mulkerrins et al., "Evaluation of the parameters affecting nitrogen and phosphorus removal in anaerobic/anoxic/oxic (A/A/O) biological nutrient removal systems", J CHEM TECH, 75(4), 2000, pp. 261-268

Abstract

Considerable research has been performed on biological nutrient removal (BNR) systems which remove the problematic nutrients, nitrogen and phosphorus, that cause eutrophication. This research focussed on setting up two laboratory-scale anaerobic/anoxic/oxic (A/A/O) systems and investigating their reliability while undergoing various parameter changes. Pump failure, in thefirst trial, R1, led to a decrease in pH, exposure of the sludge to relatively low nitrate concentrations and reduction of the suspended solids concentration within the system. This adversely affected the phosphorus removal efficiency. Shock loading the system with increased influent phosphate concentrations for 56 days was shown to aid remediation of the phosphorus removal efficiency to values between 65 and 70% (w/w). The second trial, R2, highlighted the presence of bacteria capable of P-uptake under anoxic conditions (in the presence of nitrate). The characteristic anaerobic P-release wasalso evident. The bacteria responsible for phosphate uptake under anoxic conditions are thought to be the denitrifying phosphate removing bacteria (DPB). However, the presence of higher nitrate concentrations retarded the P-removal efficiency to some extent. Secondary release of P was evident in the clarifier of the A/A/O system during the R2 trial and especially during times of increased nitrate concentrations in the system. Between 20 and 40% (w/w) of the P taken up in the oxic stage of the system was released in theclarifier at various stages throughout the trial. (C) 2000 Society of Chemical Industry.

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Documento generato il 29/03/20 alle ore 03:03:04