Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Jialing Tang, Xiaochang C. Wang, Yisong Hu, Yunhui Pu, Jin Huang, Huu Hao Ngo, Yonggang Zeng, Yuyou Li

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

In this study, nitrogen removal using the lactic acid fermentation products from food waste and other external chemical carbon sources (sodium acetate, sodium lactate and starch) was investigated. Similar to sodium acetate and lactate, the lactic acid-enriched fermentation liquid from food waste (FLFW) exhibited a high denitrification rate (5.5 mg NOx-N/(g-VSS h)) and potential (0.16 g NO3-N/g COD), and could achieve high NH4+-N and total nitrogen (TN) removal efficiencies during long-term operation. Using FLFW as supplementary carbon sources reduced the extracellular polymeric substances (EPS) content, improved the settleability and achieved a satisfactory biomass yield of activated sludge. Additionally, the increased microbial metabolic activity and bacterial community diversity and the accumulation of unique bacteria in the activated sludge cultured with FLFW further promoted the organics utilization rate and nitrogen removal efficiency, indicating that the FLFW prepared from solid waste was an ideal carbon source for wastewater treatment.

Original languageEnglish
Pages (from-to)259-268
Number of pages10
JournalBioresource Technology
Volume256
DOIs
Publication statusPublished - 2018 May

Keywords

  • Carbon source
  • Extracellular polymeric substances (EPS)
  • Lactic acid-enriched fermentation liquid from food waste
  • Microbial community
  • Nitrogen removal

ASJC Scopus subject areas

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

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