DBPapers
DOI: 10.5593/SGEM2014/B41/S17.076

THE STUDY OF DIGESTATE PROPERTIES FROM SELECTED BIOGAS PLANTS

S. Heviankova, D. Rozbroj, L. Simkova, M. Kyncl, M. Madrova
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-15-5 / ISSN 1314-2704, June 19-25, 2014, Book 4, Vol. 1, 581-588 pp

ABSTRACT
The study deals with the issue of waste products from anaerobic digestion. The objective is to compare the properties of digestate and the products of its separation via centrifuging, i.e. the liquid phase, the so-called digestate liquor and the solid phase, the so-called digestate fibre. The whole digestate samples were drawn from biogas plants (BGP) in the Moravia-Silesian and Olomouc Regions, the Czech Republic. The digestates were sampled during 7 months. Having separated the digestate sample in the laboratory conditions, the products of separation and the whole digestate underwent chemical analyses. The observed indicators are: CODCr, BOD5, total phosphorus and ammonia nitrogen. The results show that the properties of digestate samples from different sources are comparable. The mean value of CODCr in the digestate was about 51,900mg.kg-1; BOD5 6,900mg.kg-1; Ptotal 810mg.kg-1; N-NH4 2,500mg.kg-1 of the original sample mass. The mean value of CODCr in the digestate liquor was about 34,200 mg.kg-1; BOD5 5,300mg.kg-1; Ptotal 200mg.kg-1; N-NH4 2,500mg.kg-1 of the original sample mass. The mean value of CODCr in the digestate fibre was about 92,200mg.kg-1; BOD5 12,000mg.kg-1; Ptotal 2,000mg.kg-1; N-NH4 2,300mg.kg-1 of the original sample mass.

Keywords: digestate, digestate liquor, digestate fibre, biogas plant, biogas