Effect of increasing the surface area of primary sludge on anaerobic digestion at low temperature

M. Halalsheh, G. Kassab, H. Yazajeen, S. Qumsieh, J. Field

Research output: Contribution to journalArticle

24 Scopus citations


Two sets of reactors were operated at 15°C and at sludge retention times (SRTs) of 65days and 30days, respectively. Each set was operated at six different mixing velocities. Shear forces provided by mixing affected particle size distribution and resulted in different sludge surface areas. The aim was to investigate the effect of increasing primary sludge surface area on anaerobic digestion at low temperature. The maximum surface areas at the applied mixing velocities were 5926cm2/cm3of sludge and 4672cm2/cm3 of sludge at SRTs of 65days and 30days, respectively. The corresponding calculated methanogenesis were 49% and 15% at SRTs of 65days and 30days, respectively. Maximum total solids (TS) reductions were 26% and 11% at 65days and 30days SRTs, respectively. Lipase activity increased with increasing SRT and sludge surface area. Results clearly showed that increasing sludge surface area improved sludge digestion at 15°C.

Original languageEnglish (US)
Pages (from-to)748-752
Number of pages5
JournalBioresource Technology
Issue number2
StatePublished - Jan 1 2011



  • Anaerobic digestion
  • Lipase activity
  • Mixing velocities
  • SRT
  • Surface area

ASJC Scopus subject areas

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

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