Enhanced hydrolysis of waste activated sludge and recovery of volatile fatty acids: Performance and mechanistic analysis of synergistic treatment with sodium citrate and calcium oxide.
Bioresour Technol
; 407: 131143, 2024 Sep.
Article
em En
| MEDLINE
| ID: mdl-39043280
ABSTRACT
Anaerobic fermentation has emerged as a promising method of transforming waste activated sludge into high-value products (e.g., volatile fatty acids (VFAs)). This work developed sodium citrate (SC)-calcium oxide (CaO) pretreatment to accelerate the production of VFAs by enhancing sludge solubilization and disintegration of extracellular polymeric substances. The results showed that co-pretreatment with 0.25 g/g TSS of SC and 0.05 g/g TSS of CaO effectively boosted VFAs accumulation (5823.3 mg COD/L), which was 12.2 times higher than the Control group. SC-CaO pretreatment enhanced hydrolysis and acidogenesis by providing ample organic substrates, thereby promoting the growth of hydrolytic and acidogenic bacteria. Additionally, the fermentation broth resulting from co-pretreatment exhibited lower phosphorus concentration and higher biodegradability. Economic analysis confirmed that the combined pretreatment is cost-effective. This work provides a viable strategy for enhancing high-value product recovery from sludge.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Óxidos
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Esgotos
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Citratos
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Compostos de Cálcio
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Ácidos Graxos Voláteis
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Citrato de Sódio
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article