A novel Fe(II)-Ca synergistic phosphorus removal process: process optimization and phosphorus recovery.
Environ Sci Pollut Res Int
; 25(2): 1543-1550, 2018 Jan.
Article
em En
| MEDLINE
| ID: mdl-29098579
ABSTRACT
Phosphorus removal from wastewater is an important means to control eutrophication and to recover phosphorus from wastewater. In this study, a novel Fe(II)-Ca synergistic phosphorus removal process is developed using the complex of ferrous and calcium salts. The results showed that ferrous and calcium had an antagonistic effect at Fe(II)/Ca molar ratio of lower than 14, but a synergistic effect at Fe(II)/Ca molar ratio of higher than 14, with the strongest synergistic effect at Fe(II)/Ca molar ratio of 73. The optimal parameters of this novel process were as follows Fe(II)/Ca = 31, ferrous-calcium complex/phosphorous (M/P) ≥ 1.51, pH = 7.0-8.0, and fast mixing speed (FMS) = 100-150 rpm. The cost of phosphorus removal agents was US$1.024 (kg P)-1, reduced by 30.39% compared with that of the traditional phosphorus removal process. The phosphorus content (by P2O5) in the precipitate produced in the new process was 32.70%, which had a high recycling value.
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Base de dados:
MEDLINE
Assunto principal:
Fósforo
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Poluentes Químicos da Água
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Compostos Ferrosos
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Cálcio
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Purificação da Água
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Recuperação e Remediação Ambiental
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Reciclagem
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article