TY - JOUR
T1 - Anaerobic Biodegradability of Digestates – Influence of and Correlations for Klason lignin
AU - Mächtig, Torsten
AU - Casaretto, René
AU - Moschner, Christian R.
AU - Born, Jens
AU - Holm-Nielsen, Jens Bo
AU - Hartung, Eberhard
PY - 2020/1
Y1 - 2020/1
N2 - Appropriate evaluation of the process performance of biogas plants needs to consider the anaerobic biodegradability of the used biomass. Anaerobic biodegradability is limited by lignin, which is part in most substrates and, by extension, in digestates of biogas plants. Previous research has shown that the content of acid detergent lignin (ADL) in digestates can be predicted from measured gross calorific values (GCVs). The correlation of GCV of 34 digestate samples to an alternative measure for lignin, the Klason lignin (KL), is evaluated as well as the correlation of KL content and other chemical constituents to residual biomethane potential (BMP). Results indicate a very low correlation of chemical composition to GCV and BMP. A correlation of GCV to BMP was not observable. The results let conclude that evaluation of anaerobic biodegradability of digestates by measuring KL or predicting KL from GCV is not productive.
AB - Appropriate evaluation of the process performance of biogas plants needs to consider the anaerobic biodegradability of the used biomass. Anaerobic biodegradability is limited by lignin, which is part in most substrates and, by extension, in digestates of biogas plants. Previous research has shown that the content of acid detergent lignin (ADL) in digestates can be predicted from measured gross calorific values (GCVs). The correlation of GCV of 34 digestate samples to an alternative measure for lignin, the Klason lignin (KL), is evaluated as well as the correlation of KL content and other chemical constituents to residual biomethane potential (BMP). Results indicate a very low correlation of chemical composition to GCV and BMP. A correlation of GCV to BMP was not observable. The results let conclude that evaluation of anaerobic biodegradability of digestates by measuring KL or predicting KL from GCV is not productive.
KW - Anaerobic biodegradability
KW - Biogas
KW - Biomethane potential
KW - Calorimetry
KW - Klason lignin
UR - http://www.scopus.com/inward/record.url?scp=85074753789&partnerID=8YFLogxK
U2 - 10.1002/ceat.201900355
DO - 10.1002/ceat.201900355
M3 - Journal article
SN - 0930-7516
VL - 43
SP - 39
EP - 46
JO - Chemical Engineering and Technology
JF - Chemical Engineering and Technology
IS - 1
ER -