Performance and granulation in an upflow anaerobic sludge blanket (UASB) reactor treating saline sulfate wastewater.
Biodegradation
; 25(1): 127-36, 2014 Feb.
Article
em En
| MEDLINE
| ID: mdl-23624725
ABSTRACT
An upflow anaerobic sludge blanket reactor was employed to treat saline sulfate wastewater. Mesophilic operation (35 ± 0.5 °C) was performed with hydraulic retention time fixed at 16 h. When the salinity was 28 g L(-1), the chemical oxygen demand and sulfate removal efficiencies were 52 and 67 %, respectively. The salinity effect on sulfate removal was less than that on organics removal. The methane productions were 887 and 329 cm(3) L(-1) corresponding to the NaCl concentrations of 12 and 28 g L(-1), respectively. High salinity could stimulate microbes to produce more extracellular polymeric substances (EPSs) and granulation could be performed better. Besides, with the high saline surroundings, a great deal of Na(+) compressed the colloidal electrical double-layer, neutralized the negative charge of the sludge particles and decreased their electrostatic repulsion. The repulsion barrier disappeared and coagulation took place. The maximum size of granules was 5 mm, which resulted from the coupled triggering forces of high EPSs and Na(+) contents. Sulfate-reducing bacteria (SRB) were dominant in the high saline surroundings while the methane-producing archaea dominated in the low saline surroundings. The SRB were affected least by the salinity.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Sulfatos
/
Bactérias Redutoras de Enxofre
/
Archaea
/
Águas Residuárias
Idioma:
En
Revista:
Biodegradation
Assunto da revista:
BIOQUIMICA
/
SAUDE AMBIENTAL
Ano de publicação:
2014
Tipo de documento:
Article