Ammonia recovery from acidogenic fermentation effluents using a gas-permeable membrane contactor.
Bioresour Technol
; 356: 127273, 2022 Jul.
Article
em En
| MEDLINE
| ID: mdl-35526718
ABSTRACT
A gas-permeable membrane (GPM) contactor was used to recover ammoniacal nitrogen from a synthetic and a biowaste fermentation broth under different pH (from 6 to 11) and temperatures (35 and 55 °C). Ammonia mass transfer constant (Km) increased as pH and temperature increased. For synthetic broth, pH 10 provided the best results, when considering the Km (9.2·10-7 m·s-1) and the reagents consumption (1.0 mol NaOH·mol-1 TAN and 0.6 mol H2SO4·mol-1 TAN). Biowaste fermentation generated a broth with a high concentration of ammoniacal nitrogen (4.9 g N·L-1) and volatile fatty acids (VFA) (41.1 g COD·L-1). Experiments using the biowaste broth showed a lower Km (5.0·10-7 m·s-1 at pH 10) than the synthetic broth, related to the solution matrix and other species interference. VFAs were not detected in the trapping solution. Overall, these results show that GPM is a suitable technology to efficiently separate ammoniacal nitrogen and VFA from fermentation broths.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Reatores Biológicos
/
Amônia
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article