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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 4, 2015, pp. 1183-1190
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Bioline Code: st15108
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 4, 2015, pp. 1183-1190
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Processing separated digestate by vermicomposting technology using earthworms of the genus Eisenia
Hanc, A. & Vasak, F.
Abstract
In the current study, pre-composting and subsequent
vermicomposting of separated digestate (also
called separated biogas plant slurry) were verified to
improve its properties for use as a soil conditioner.
Increasing the proportion of straw in combination with
separated digestate had a positive effect on reducing both
weight and volume during vermicomposting. The pH value
decreased and was found to be between 7.3 and 7.7 in the
final vermicomposts. Due to a loss in organic matter, the
total content of macro-elements increased at the end of
vermicomposting with the exception of calcium. Similarly,
the available contents of phosphorus and potassium
increased, which was positive in terms of the use of vermicompost
for agricultural purposes. After 5 months of
vermicomposting, the earthworm biomass increased from
282 to 896 % depending on the treatment. The best results
were achieved during the vermicomposting of a mixture of
straw (25 vol %) with separated digestate (75 vol %).
Keywords
Biogas plant slurry; Pre-composting; Vermicompost; Straw; Sustainable treatment
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