Cultivation of aerobic granular sludge in continuous flow under various selective pressure.
Bioresour Technol
; 253: 281-287, 2018 Apr.
Article
en En
| MEDLINE
| ID: mdl-29353757
ABSTRACT
Formation of aerobic granular sludge was examined in a novel continuous flow configuration, at 20⯱â¯1⯰C. Synthetic proteinaceous wastewater with municipal primary effluent characteristics was used (i.e., CODâ¯=â¯370⯱â¯30â¯mg/L; TNâ¯=â¯43⯱â¯7â¯mg/L; and TPâ¯=â¯10⯱â¯2â¯mg/L). Various levels of selective pressure were applied after inoculation with flocculent sludge (i.e., estimated velocity gradients during settling between 1 and 9â¯1/s). Impeller rpm of 15 and below generated floccular-granular biomass, while 20â¯rpm and above generated large granules with a filamentous population. Effluent soluble COD, total inorganic nitrogen, and phosphate of 25⯱â¯7â¯mg/L, 11⯱â¯1â¯mg/L, and 0.1⯱â¯0.1â¯mg/L, respectively, were obtained. Observed yields were as low as 0.08-0.19â¯g-VSS/g-COD and whole sludge solids retention time was 18⯱â¯1â¯d. Famine conditions developed for 90% of the total aerobic volume andâ¯>45⯱â¯3% anaerobic substrate utilization was recorded. Aerobic granulation was demonstrated feasible under continuous flow providing adequate treatment with low biomass yields.
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01-internacional
Base de datos:
MEDLINE
Asunto principal:
Aguas del Alcantarillado
/
Eliminación de Residuos Líquidos
Idioma:
En
Revista:
Bioresour Technol
Asunto de la revista:
ENGENHARIA BIOMEDICA
Año:
2018
Tipo del documento:
Article