Low-temperature limitation of bioreactor sludge in anaerobic treatment of domestic wastewater.
Water Sci Technol
; 69(5): 1004-13, 2014.
Article
em En
| MEDLINE
| ID: mdl-24622549
ABSTRACT
Two strategies exist for seeding low-temperature anaerobic reactors the use of specialist psychrophilic biomass or mesophilic bioreactor sludge acclimated to low temperature. We sought to determine the low-temperature limitation of anaerobic sludge from a bioreactor acclimated to UK temperatures (<15 °C). Anaerobic incubation tests using low-strength real domestic wastewater (DWW) and various alternative soluble COD sources were conducted at 4, 8 and 15 °C; methanogenesis and acidogenesis were monitored separately. Production of methane and acetate was observed; decreasing temperature resulted in decreased yields and increased 'start-up' times. At 4 °C methanogenesis not hydrolysis/acidogenesis was rate-limiting. The final methane yields at 4 °C were less than 35% of the theoretical potential whilst at 8 and 15 °C more than 75 and 100% of the theoretical yield was achieved respectively. We propose that the lower temperature limit for DWW treatment with anaerobic bioreactor sludge lies between 8 and 4 °C and that 8 °C is the threshold for reliable operation.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Temperatura Baixa
/
Purificação da Água
/
Reatores Biológicos
Tipo de estudo:
Evaluation_studies
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article