Alkaline fermentation of waste activated sludge with calcium hydroxide to improve short-chain fatty acids production and extraction efficiency via layered double hydroxides

Xiao Ma, Jiongjiong Ye, Li Jiang, Liang Sheng, Jianyong Liu, Yu You Li, Zhi Ping Xu

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Ca(OH)2 addition was proposed to improve short chain fatty acids (SCFAs) production via alkaline fermentation of waste activated sludge (WAS), with CO32− and PO43− being removed simultaneously, so that the SCFAs extraction efficiency could be improved. Alkaline fermentation of WAS with Ca(OH)2 and NaOH addition were performed respectively, and the efficiencies of SCFAs extraction from the fermentation liquids via in situ layered double hydroxides (LDHs) were investigated. The results showed that, the SCFAs production was much more improved with NaOH addition than that with Ca(OH)2 addition. However, the SCFAs contents in the synthesized SCFAs-LDH were 6.7 ± 0.4 mg COD/L (control), 12.4 ± 0.5 mg COD/L (with NaOH addition) and 17.4 ± 0.4 mg COD/L (with Ca(OH)2 addition), respectively. This means that Ca(OH)2 addition is an effective way to improve SCFAs extraction from fermentation liquid of WAS.

Original languageEnglish
Pages (from-to)117-123
Number of pages7
JournalBioresource Technology
Volume279
DOIs
Publication statusPublished - 2019 May

Keywords

  • Anaerobic fermentation liquid (AFL)
  • Calcium hydroxide
  • Layered double hydroxides (LDHs)
  • Short chain fatty acids (SCFAs)

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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