Mixotrophic denitrification of waste activated sludge fermentation liquid as an alternative carbon source for nitrogen removal: Reducing N2O emissions and costs.
J Environ Manage
; 362: 121348, 2024 Jun.
Article
em En
| MEDLINE
| ID: mdl-38824891
ABSTRACT
Heterotrophic-sulfur autotrophic denitrification (HAD) has been proposed to be a prospective nitrogen removal process. In this work, the potential of fermentation liquid (FL) from waste-activated sludge (WAS) as the electron donor for denitrification in the HAD system was explored and compared with other conventional carbon sources. Results showed that when FL was used as a carbon source, over 99% of NO3--N was removed and its removal rate exceeded 14.00 mg N/g MLSS/h, which was significantly higher than that of methanol and propionic acid. The produced sulfate was below the limit value and the emission of N2O was low (1.38% of the NO3--N). Microbial community analysis showed that autotrophic denitrifiers were predominated in the HAD system, in which Thiobacillus (16.4%) was the dominant genus. The economic analysis showed the cost of the FL was 0.062 /m3, which was 30% lower than that in the group dosed with methanol. Our results demonstrated the FL was a promising carbon source for the HAD system, which could reduce carbon emission and cost, and offer a creative approach for waste-activated sludge resource reuse.
Palavras-chave
Texto completo:
1
Temas:
ECOS
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Financiamentos_gastos
Bases de dados:
MEDLINE
Assunto principal:
Esgotos
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Carbono
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Fermentação
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Desnitrificação
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Nitrogênio
Idioma:
En
Revista:
J Environ Manage
Ano de publicação:
2024
Tipo de documento:
Article