Effects of magnesium ions in microbial cells adhesion of attached growth system for the enhancement of biogas production


  • Nabilah Aminah Lutpi Universiti Malaysia Perlis
  • Wong Yee Shian Universiti Malaysia Perlis
  • Tengku Nuraiti Tengku Izhar Universiti Malaysia Perlis
  • Yiek Wee Kiong Universiti Malaysia Perlis




Biogas, biofilm, thermophilic, magnesium, immobilisation


This research aims to improve the biogas production by employing cell immobilisation technique under thermophilic conditions. The thermophilic fermentative biogas production was carried out by immobilising the anaerobic sludge obtained from palm oil mill treatment plant on granular activated carbon (GAC) in repeated batch mode. Different concentration of magnesium ions (Mg2+) (0.25, 0.5, 0.75, 1.0 and 1.5 g/l) on biogas production was investigated at 60°C with an initial sucrose concentration of 5 g/l as feedstock. The effect of Mg2+ supplementation at the initial stage of immobilisation process is important to increase the formation of biofilm in the attached growth system. This study had found that Mg2+ could enhance the biogas production capacity with optimum Mg2+ concentration of 0.75 g/l.

Author Biographies

Nabilah Aminah Lutpi, Universiti Malaysia Perlis

School of Environmental Engineering

Wong Yee Shian, Universiti Malaysia Perlis

School of Environmental Engineering

Tengku Nuraiti Tengku Izhar, Universiti Malaysia Perlis

School of Environmental Engineering

Yiek Wee Kiong, Universiti Malaysia Perlis

School of Environmental Engineering


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