Pretreating anaerobic fermentation liquid with calcium addition to improve short chain fatty acids extraction via in situ synthesis of layered double hydroxides

Liang Sheng, Jianyong Liu, Cheng Zhang, Lianpei Zou, Yu You Li, Zhi Ping Xu

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

In situ synthesis of layered double hydroxides (LDHs) was proved to be an effective way to extract short chain fatty acids (SCFAs) from anaerobic fermentation liquid (AFL) as carbon source for biodenitrification, but the SCFAs content in SCFAs-LDH was unsatisfactory because of the existence of much carbonate in AFL. Pretreatment of AFL with calcium addition was investigated to remove carbonate and improve SCFAs extraction via LDHs synthesis. Results of batch tests showed that, the carbonate removal efficiency was as high as 76.6% when the calcium addition was 0.06 mol/L at pH 12. When using the optimal SCFAs/Al 3+ ratio of 3.0, the total SCFAs content in SCFAs-LDH with pretreatment was improved to 46.5 mg COD/g LDH, which was 4.5 times of the control (10.4 mg COD/g LDH). These results suggest that adding calcium to AFL was an effective way to eliminate the negative effect of carbonates on SCFAs-LDH synthesis.

Original languageEnglish
Pages (from-to)190-195
Number of pages6
JournalBioresource Technology
Volume271
DOIs
Publication statusPublished - 2019 Jan

Keywords

  • Anaerobic fermentation liquid (AFL)
  • Calcium addition
  • 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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