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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2010

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Anaerobic digestion of maize hybrids for methane production

Vindis P., Mursec B., Janzekovic M., Stajnko D., Cus F.

Journal of Achievements in Materials and Manufacturing Engineering

2010

Vol. 40, nr 1

87-94

Purpose: This research project was aimed at optimising anaerobic digestion of maize and find out which maturity class of corn and which hybrid of a particular maturity class produces the highest rate of biogas and biomethane. Also the chemical composition of gases was studied. Design/methodology/approach: Biogas and biomethane production and composition in mesophilic (35 degrees C) conditions were measured and compared. The corn hybrids of FAO 300 - FAO 600 maturity class were tested. Experiments took place in the lab, for 35 days within four series of experiments with four repetitions according to the method DIN 38 414. Findings: Results show that the highest maturity classes of corn (FAO 500) increases the amount of biogas and biomethane. The greatest gain of biogas, biomethane according to maturity class is found with hybrids of FAO 400 and FAO 500 maturity class. Among the corn hybrids of maturity class FAO 300 - FAO 400, the hybrid PR38F70 gives the greatest production of biogas and biomethane. Among the hybrids of maturity class FAO 400 - FAO 500, the greatest amount of biogas and biomethane was produced by the hybrid PIXXIA (FAO 420). Among the hybrids of maturity class FAO 500 - FAO 600 the hybrid CODISTAR (FAO 500) the highest production of biomethane. Production of biomethane, which has the main role in the production of biogas varied with corn hybrids from 50-60 % of the whole amount of produced gas. Research limitations/implications: Economic efficiency of anaerobic digestion depends on the optimum methane production and optimum anaerobic digestion process. Practical implications: The results reached serve to plan the electricity production in the biogas production plant and to achieve the highest biomethane yield per hectare of maize hybrid. Originality/value: Late ripening varieties (FAO ca. 600) make better use of their potential to produce biomass than medium or early ripening varieties.