Phosphorus removal from anaerobically digested swine wastewater through struvite precipitation.
Water Sci Technol
; 61(12): 3228-34, 2010.
Article
em En
| MEDLINE
| ID: mdl-20555221
ABSTRACT
Phosphorus removal from agricultural wastewater streams is an important aspect of managing surface water quality, due to the contribution of phosphorus to eutrophication. Removal of phosphorus through struvite precipitation allows for its recovery as a potential fertilizer, and by determining the best conditions for struvite precipitation the removal process can be optimized. The effects of pH, MgP ratio, and time on struvite precipitation from anaerobically digested swine manure effluent were investigated. Effluent with MgP ratios from 1.01 to 1.61 were adjusted to pH values between 7.5 and 9.5 and left to equilibrate for 24 h. Results indicate that phosphorus removal increased with increasing pH and MgP ratio; the maximum phosphorus removal achieved was 80% at pH 9.0 and a MgP ratio of 1.61. The purest struvite precipitate was found at pH 7.5, with calcium carbonate and struvite precipitating at higher pH values. A continuously stirred batch of centrate was adjusted to pH 8.4 to determine the struvite formation rate constant. The rate constant was found to be 1.55 h(-1), with 17% phosphorus removal during the first 20 min. The results indicate that struvite precipitation could be a viable method of phosphorus removal from anaerobically digested swine manure.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fosfatos
/
Fósforo
/
Eliminação de Resíduos Líquidos
/
Compostos de Magnésio
Limite:
Animals
Idioma:
En
Revista:
Water Sci Technol
Assunto da revista:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Canadá