Anaerobic digestion of vegetable processing wastes with catalyst metaferm and microelements
2015
Dubrovskis, V., Latvia Univ. of Agriculture, Jelgava (Latvia) | Kotelenecs, V., Latvia Univ. of Agriculture, Jelgava (Latvia) | Plume, I., Latvia Univ. of Agriculture, Jelgava (Latvia)
54 biogas plants are working today in Latvia. There is a need to investigate the suitability of various biomasses for energy production. One of the ways for improving the biogas yield in Latvia conditions is adding biological catalysts and microelements. This paper shows results from anaerobic digestion of vegetable processing wastes using a new biological catalyst Metaferm and mix of microelements. The digestion process was investigated for biogas production in sixteen 0.75 l digesters, operated in batch mode at temperature 38 ± 1.0 ºC. The average methane yield per unit of dry organic matter added (DOM) from digestion of cucumbers was 0.282 l·gDOM E-1 with Metaferm 1 ml – 0.340 l·gDOM E-1 and with MEL1 – 0.337 l·gDOM E-1. The average methane yield from digestion of cucumbers with Metaferm 1 ml- and ME5 was 0.322 l·gDOM E-1. The average methane yield from digestion of leftovers and tops of tomatoes was 0.158 l·gDOM E-1 and with Metaferm 1 ml – 0.173 l·gDOM E-1. The average methane yield per unit of dry organic matter added from digestion of grass silage and MEL1 was 0.121 l·gDOM E-1. All investigated vegetable wastes can be successfully cultivated for energy production under agro ecological conditions in Latvia. Addition of the catalyst Metaferm increased the methane yield.
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