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2 Journal of Achievements in Materials and Manufacturing Engineering

2 2009

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The impact of mesophilic and thermophilic anaerobic digestion on biogas production

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

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 36, nr 2

192-198

Purpose: of this paper is to compare mesophilic and thermophilic anaerobic digestion of three maize varieties. Parameters such as biogas production and biogas composition from maize silage were measured and calculated. The amount of biogas production (methane) was observed by the mini digester. Design/methodology/approach: Biogas production and composition in mesophilic (35 degrees C) and thermophilic (55 degrees C) conditions were measured and compared. The measurements were performed with mini digester according to DIN 38414 part 8. We used three different maize varieties (NK PAKO, PR34N43 and RAXXIA). Findings: Biogas yields ranged between 315 - 409 Nl kg VS-1 in mesophilic conditions and 494 – 611 Nl kg VS-1 in thermophilic conditions. The highest biogas yield was in case of NK PAKO (611 NI kg VS-1) in thermophilic conditions. The lowest biogas yield was in case of PR34N43 (315 NI kg VS-1) in mesophilic conditions. Biogas quality produced in thermophilic temperature range is better than biogas quality produced in mesophilic temperature range. Thermophilic digestion is 4 times more intense, has higher VSS removal efficiency and yields more biogas. Research limitations/implications: Thermophilic stabilization of energy plants at 55°C is truly economical, more biogas is produced. The only disadvantage of thermophilic stabilization is that more energy is used for heating fermenters. Therefore, further researches are necessary. Practical implications: For biogas plants with mesophilic digesters we suggest an upgrade of existing mesophilic digesters (35°C) to thermophilic digesters (55°C), which is an economically beneficial solution compared to construction of additional mesophilic digesters. Originality/value: The mini digester for biogas production was built as special equipment. It can be used in mesophilic and thermophilic conditions. The quality of the produced biogas is determined with a gas analyser GA 45.

Mini digester and biogas production from plant biomass

Vindis P., Mursec B., Rozman C., Janzekovic M., Cus F.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 35, nr 2

191-196

Purpose: The aim of the paper is to present the construction of a mini digester for biogas production from different agriculture plant biomass and other organic wastes. The amount of biogas production (methane) is observed by the mini digester. Design/methodology/approach: The mini digester consisting of twelve units was built and some measurements with agriculture plant biomass were performed according to DIN 38414 part 8. Four tests simultaneously with three repetitions can be performed. Findings: With the mini digester the amount of biogas production is observed. The parameters such as biogas production and biogas composition from maize and sugar beet silage in certain ratio were measured and calculated. The highest biogas and methane yield was 493 NI kg VS-1 or 289 NI CH4 kg VS-1. Research limitations/implications: The scope of substrates for the anaerobic digestion process is on the increase so the interest in the use of the biogas as a source of a renewable energy is very high. With mini digester it is possible to observe the amount of biogas (methane) production and so the most suitable plant giving the maximum methane yield, can be determined. Practical implications: The aim of biogas as renewable source of energy is to replace fossil fuels with sustainable energy production systems and to fulfil the requirements of the Kyoto Protocol. On big farms the liquid manure and different energy crops can be used for biogas production. That can improve the economical efficiency of the farm and reduce the CO2 emissions. Originality/value: Mini digester for biogas production was built as special equipment. The quality of produced biogas is determined with a gas analyser GA 45.