Applied Biochemistry and Biotechnology

, Volume 84, Issue 1–9, pp 731–741 | Cite as

Development of a modified three-stage methane production process using food wastes

  • Si W. Kim
  • Jin Y. Park
  • Jung K. Kim
  • Jae H. Cho
  • Young N. Chun
  • In H. Lee
  • Jung S. Lee
  • Jin S. Park
  • Don-Hee Park
Article

Abstract

Amodified three-stage system was developed for the rapid production of methane from food wastes. The primary stage wasa semianaerobic hydrolysis/aci dogenic system, in which approx 4100 mg/L of volatile fatty acids (VFAs) was produced at a hydraulic retention time (HRT) of 2 d. The operation temperature and pH were 30°C and 5.0–5.5, respectively. The nondegraded materials were removed through a holeat the bottom of the reactor. The secondary stage was an anaerobic aci dogenic system equipped with an upflow anaerobic sludge blanket (UASB) type of fermentor. VFA was accumulated up to 6100 mg/L by the addition of Clostridium butyricum to the reactor at an HRT of 2 d. The optimum temperature and pH range were 35°C and 5.0–5.5, respectively. The terliary methanogenic stage produced CH4 and CO2 from the VFA in the UASB reactor. Methane content was 72% of the total gas volume, and the yield was 0.45–0.50 m3/kg of volatile solids at an HRT of 12 d. The operation temperature and pH were 41°C and 7.6–7.9, respectively. The three-stage process exhibited an unusually high total chemical oxygen dem and reduction rate up to 95%. Total nitrogen decreased to 96% and <10 mg/L of total phosphorus remained in the final effluent.

Index Entries

Anaerobic digestion volatile fatty acid modified threestage methane production process 

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Copyright information

© Humana Press Inc 2000

Authors and Affiliations

  • Si W. Kim
    • 1
  • Jin Y. Park
    • 1
  • Jung K. Kim
    • 1
  • Jae H. Cho
    • 1
  • Young N. Chun
    • 1
  • In H. Lee
    • 1
  • Jung S. Lee
    • 2
  • Jin S. Park
    • 3
  • Don-Hee Park
    • 4
  1. 1.Department of Environmental EngineeringChosun UniversityKwangjuSouth Korea
  2. 2.Department of Biological ScienceChosun UniversityKwangjuSouth Korea
  3. 3.Department of Materials Science and EngineeringChosun UniversityKwangjuSouth Korea
  4. 4.Department of Biochemical EngineeringChonnam National UniversityKwangjuSouth Korea

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