Comparison of single-stage and temperature-phased two-stage anaerobic digestion of oily food waste

Li Jie Wu, Takuro Kobayashi, Gyokuyu Ri, Kai Qin Xu

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Anaerobic digestion is an effective technology to recover energy from oily food waste. A single-stage system and temperature-phased two-stage systems with and without recycle for anaerobic digestion of oily food waste were constructed to compare the operation performances. The synchronous operation indicated the similar ability to produce methane in the three systems, with a methane yield of 0.44 L/g VSadded. The pH drop to less than 4.0 in the first stage of two-stage system without recycle resulted in poor hydrolysis, and methane or hydrogen was not produced in this stage. Alkalinity supplement from the second stage of two-stage system with recycle improved pH in the first stage to 5.4. Consequently, 35.3% of the particulate COD in the influent was reduced in the first stage of two-stage system with recycle according to a COD mass balance, and hydrogen was produced with a percentage of 31.7%, accordingly. Similar solids and organic matter were removed in the single-stage system and two-stage system without recycle. More lipid degradation and the conversion of long-chain fatty acids were achieved in the single-stage system. Recycling was proved to be effective in promoting the conversion of unsaturated long-chain fatty acids into saturated fatty acids in the two-stage system.

Original languageEnglish
Pages (from-to)1174-1182
Number of pages9
JournalEnergy Conversion and Management
Volume106
DOIs
Publication statusPublished - 2015 Dec 1

Keywords

  • Anaerobic digestion
  • Food waste (FW)
  • Long-chain fatty acid (LCFA)
  • Recycle
  • Temperature-phased anaerobic digestion (TPAD)
  • Two-stage

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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