Nickel as an accelerator of biogas production in water hyacinth (Eichornia crassipes solms.)

Abstract

The effect of nickel ions on biogas production has been investigated in 3-litre fermenters. It was observed that nickel is stimulatory up to 5 ppm, with an optimum at 2·5 ppm, in a water hyacinth-bovine excreta substrate. A similar effect with nickel was also observed at 5 ppm in bovine excreta.