Assessment of effluent turbidity in mesophilic and thermophilic activated sludge reactors - origin of effluent colloidal material.
Appl Microbiol Biotechnol
; 59(1): 105-11, 2002 Jun.
Article
em En
| MEDLINE
| ID: mdl-12073140
ABSTRACT
Two lab-scale plug flow activated sludge reactors were run in parallel for 4 months at 30 and 55 degrees C. Research focussed on (1) COD (chemical oxygen demand) removal, (2) effluent turbidity at both temperatures, (3) the origin of effluent colloidal material and (4) the possible role of protozoa on turbidity levels. Total COD removal percentages over the whole experimental period were 66+/-7% at 30 degrees C and 53+/-11% at 55 degrees C. Differences in total COD removal between both systems were due to less removal of soluble and colloidal COD at 55 degrees C compared to the reference system. Thermophilic effluent turbidity was caused by a combination of influent colloidal particles that were not effectively retained in the sludge flocs, and erosion of the thermophilic activated sludge itself, as shown by denaturing gradient gel electrophoresis (DGGE) profiles. DGGE analysis of PCR-amplified 16S rDNA fragments from mesophilic and thermophilic sludge differed, indicating that different microbial communities were present in the two reactor systems. The effects of protozoal grazing on the effluent turbidity of both reactors was negligible and thus could not account for the large turbidity differences observed.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Esgotos
/
Eliminação de Resíduos Líquidos
/
Bactérias Redutoras de Enxofre
/
Reatores Biológicos
/
Nefelometria e Turbidimetria
Limite:
Animals
Idioma:
En
Revista:
Appl Microbiol Biotechnol
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
Holanda