Effects of various pretreatments for enhanced anaerobic digestion with waste activated sludge

Jeongsik Kim, Chulhwan Park, Tak Hyun Kim, Myunggu Lee, Sangyong Kim, Seung Wook Kim, Jinwon Lee

Research output: Contribution to journalArticlepeer-review

567 Citations (Scopus)


The purpose of this study was to enhance the efficiency of anaerobic digestion with waste activated sludge (WAS) by batch experiments. We studied the effects of various pretreatment methods (thermal, chemical, ultrasonic and thermochemical pretreatments) on the biogas production and pollutants reduction owing to solubilization enhancement, particle size reduction, increased soluble protein, and increased soluble COD. The thermochemical pretreatment gave the best results, i.e., the production of methane increased by more than 34.3% and soluble COD (SCOD) removal also increased by more than 67.8% over the control. In this case, the biogas production, methane production and the SCOD removal efficiency were about 5037 l biogas/m3 WAS, 3367 l methane/m3 WAS and 61.4%, respectively. Therefore, it is recognized that higher digestion efficiencies of the WAS were obtained through thermochemical pretreatment of the sludge.

Original languageEnglish
Pages (from-to)271-275
Number of pages5
JournalJournal of Bioscience and Bioengineering
Issue number3
Publication statusPublished - 2003


  • Anaerobic digestion
  • Biogas
  • Methane
  • Pretreatment
  • Waste activated sludge

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology


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