Chemical composition of digestate
2016
Priekulis, J., Latvia Univ. of Agriculture, Jelgava (Latvia) | Aplocina, E., Latvia Univ. of Agriculture, Jelgava (Latvia) | Laurs, A., Latvia Univ. of Agriculture, Jelgava (Latvia)
Since 2009 39 biogas production stations have been built in Latvia where livestock manure, corn silage and other kinds of biomass are used as raw materials. Therefore, on farms a new kind of soil fertilization is available – digestate produced in biogas production equipment. To compare usefulness of manure and digestate for the needs of soil fertilization 21 biogas production stations were traced, the used manure and digestate samples were taken and chemical analyses of these samples were performed. The research results show that in biogas production stations different kinds of biomass are used as in each of them different raw material components and different proportion of these components are used. Digestate is of greater value if for production of biogas mainly pig or poultry manure is used. In this case in the processed biomass or digestate the amount of N is approximately two times and the amount of P is 1.3 times bigger in comparison to usage of cattle manure. If manure and the produced digestate are compared, in the group of the stations where mainly cattle manure is used, the amount of N in the produced digestate is bigger than in the manure used for its production, but in the group of the stations where mainly pig manure is used – less than in the used liquid manure. It is related to the proportion of the biogas production raw material components and the amount of N contained in them.
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