Enhanced rate of methanol and acetate uptake for production of methane in batch cultures using Methanosarcina mazei

Abstract

Batch cultures were performed for uptake of methanol, and acetate for production of methane and CO 2 by Methanosarcina mazei cultures. The growth, substrate consumption, methane and CO 2 production characteristics were analysed and compared. The maximum values of specific growth rate, specific rate of substrate consumption from methanol were 0.047–0.084 ha −1, and 0.37–0.67 g methanol g −1 cells h −1, while the values of specific rate of methane and CO 2 formation were 13.38–19.99 m m methane g −1 cells h −1, and 5.46 m m CO 2 g −1 cells h −1, respectively. Similarly, maximum values of specific growth rate, and specific rate of acetate consumption were 0.059–0.096 h −1, 0.49–0.74 g acetate g −1 cells h −1, respectively, while the values of specific rate of methane and CO 2 formation were, 5.30–9.90 m m methane g −1 cells h −1, and 5.30–11.0 m m CO 2 g −1 cells h −1 from its consumption. The values of substrate consumption kinetic parameters are significantly higher than those reported in other studies for Methanosarcina spp. and other acetoclastic methane producers.