Pre-treatment optimisation studies for secondary effluent reclamation with reverse osmosis.
Water Res
; 37(5): 1177-84, 2003 Mar.
Article
em En
| MEDLINE
| ID: mdl-12553994
ABSTRACT
Physical-chemical pre-treatment was used for the reverse osmosis unit for reclamation of secondary effluents. The pilot plant was equipped with a variety of tertiary treatment units to prevent fouling and biofouling of the cellulose-acetate reverse osmosis membranes used. The optimisation of pre-treatment involved application of various concentrations of lime to raise the pH to 10.3-12.1, and to stabilise the sludge generated, as well as different dosages of ferric chloride (15, 20, and 25 mg/L) for the coagulation and solid-liquid separation. Sodium hypochlorite (8 mg/L) and UV disinfection are used for microbiological control. The water quality obtained, under the optimum conditions (pH=10.5; FeCl(3) 25 mg/L; anionic flocculant 0.5 mg/L; sodium hypochlorite 8 mg/L) was high, showing an average conductivity of 66 microS/cm and low COD values 4 mg O(2)/L. The product water is suitable for injection into a groundwater aquifer to counteract seawater intrusion.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Celulose
/
Eliminação de Resíduos Líquidos
/
Conservação dos Recursos Naturais
Idioma:
En
Revista:
Water Res
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Espanha