Agrochemical value of organic matter of fermenter wastes in biogas production
Kolar, L.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Zemedelska Fakulta | Kuzel, S.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Zemedelska Fakulta | Peterka, J.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Zemedelska Fakulta | Stindl, P.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Zemedelska Fakulta | Plat, V.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Zemedelska Fakulta
We performed 28-day mesophilic fermentation of a mixture of pig slurry and primary (raw) sludge from the sedimentation stage of a wastewater treatment plant at a 1:1 ratio. The components and the original and fermented mixture of slurry and sludge were subjected to acid hydrolysis. Dry matter of the solid phase of both components and both mixtures was incubated with sandy-loamy Cambisol at a weight ratio 3:1 at 25 deg C for 20 weeks; in 14-day intervals concentrations of lipids, crude protein, hemicelluloses, cellulose, lignin, total nitrogen and hot-water-insoluble solids were determined. Changes in ion exchange and buffering capacities were recorded. Labile organic matters were determined after 20 weeks of incubation. Liquid fractions of both components and their mixtures were analysed before and after anaerobic fermentation. It was concluded that beneficial effects of wastes as fertilisers from anaerobic digestion could be attributed to their liquid fraction. Despite the fact that ion exchange and buffering capacities increased after the anaerobic digestion, the organic matter was very stable and hardly degradable. Therefore, it cannot play the role of organic matter in soil and cannot be considered as an organic fertiliser.
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