Biochemical Methane Potential of Fresh and Silage 4190 Grass Under Thermophilic Conditions
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Abstract
Rapid population growth and expansion of industry have led to higher energy consumption while natural resources have been continuously decreased. Thus, making the pursuit of new energy sources is an urgent need. Thailand is noted as a country of agriculture, having high potential for producing energy crops that can be used to create renewable energy. The relatively high yield and fast growing 4190 grass is an interesting alternative for this purpose. This research was conducted to study the biochemical methane potential of 4190 grass. The modified Biochemical Methane Potential (BMP) test was conducted under thermophilic condition (55.4±0.73 °C) using 4190 grass aged 45, 70 and 90 d both in fresh and silage forms. The obtained methane yields could perfectly be fitted with modified Gompertz model (R2 ≥ 0.93). Total methane productions calculated from the model for the fresh and silage grasses of the same age were not significantly different, presumably thanks to the effect of digestion reaction at the thermophilic temperature. The highest methane yield of 199±7.77 NL/kg VSadded was attained when the fresh 4190 grass (45-d) was used as a feedstock. The bioreactor design and operation can be implemented from results gained for further study of the reactor performance under the continuous operation.
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References
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