Towards integrated operation of membrane bioreactors: effects of aeration on biological and filtration performance.
Bioresour Technol
; 171: 103-12, 2014 Nov.
Article
em En
| MEDLINE
| ID: mdl-25189515
ABSTRACT
Two experimental studies evaluated the effect of aerobic and membrane aeration changes on sludge properties, biological nutrient removal and filtration processes in a pilot plant membrane bioreactor. The optimal operating conditions were found at an aerobic dissolved oxygen set-point (DO) of 0.5 mg O2 L(-1) and a membrane specific aeration demand (SADm) of 1 m h(-1), where membrane aeration can be used for nitrification. Under these conditions, a total flow reduction of 42% was achieved (75% energy reduction) without compromising nutrient removal efficiencies, maintaining sludge characteristics and controlled filtration. Below these optimal operating conditions, the nutrient removal efficiency was reduced, increasing 20% for soluble microbial products, 14% for capillarity suction time and reducing a 15% for filterability. Below this DO set-point, fouling increased with a transmembrane pressure 75% higher. SADm below 1 m h(-1) doubled the values of transmembrane pressure, without recovery after achieving the initial conditions.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Esgotos
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Eliminação de Resíduos Líquidos
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Purificação da Água
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Reatores Biológicos
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Ar
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Filtração
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Membranas Artificiais
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article