The implementation of co-fermentation for biogenic wastes and
sewage sludge in digesters of WWTPs is a meaningful approach
that act as a driver for the energy self-sufficient operation of
WWTPs. However, anaerobic biogas generation for energy provision
is mostly found in rural areas using maize or grass as feedstock,
whereby a supply gap of co-substrates is created forWWTPs. Urban
lignocellulosic biomass could act as a substitute, since to date its
potential as a co-substrate has been given no attention yet. For that
reason, the present study evaluated 24 different urban substratesfor their theoretical methane yields, while 13 of them were further
analyzed in biochemical methane potential tests (BMP) to examine
their methane yields in practice. At this, the obtained results varied
between 0.118 Nm3 kgVS
1 and 0.412 Nm3 kgVS
1 for urban substrates
possessing lower lignin contents, such as grasses and herbs and
0.253 Nm3 kgVS
1 for chestnut as a representative for substrates with
higher lignin content. All in all, the highest methane yield during
anaerobic fermentation possessed cow parsley with
0.412 Nm3 kgVS
1, recovering 94% of its theoretical methane yield. A
GIS spatial analysis of the Rhine-Ruhr metropolitan region proved
that urban biomass is locally available in sufficient quantities
constituting biogas potentials that are worth to utilize in digesters
of municipal wastewater treatment plants.
The implementation of co-fermentation for biogenic wastes andsewage sludge in digesters of WWTPs is a meaningful approachthat act as a driver for the energy self-sufficient operation ofWWTPs. However, anaerobic biogas generation for energy provisionis mostly found in rural areas using maize or grass as feedstock,whereby a supply gap of co-substrates is created forWWTPs. Urbanlignocellulosic biomass could act as a substitute, since to date itspotential as a co-substrate has been given no attention yet. For thatreason, the present study evaluated 24 different urban substratesfor their theoretical methane yields, while 13 of them were furtheranalyzed in biochemical methane potential tests (BMP) to examinetheir methane yields in practice. At this, the obtained results variedbetween 0.118 Nm3 kgVS1 and 0.412 Nm3 kgVS1 for urban substratespossessing lower lignin contents, such as grasses and herbs and0.253 Nm3 kgVS1 for chestnut as a representative for substrates withhigher lignin content. All in all, the highest methane yield duringanaerobic fermentation possessed cow parsley with0.412 Nm3 kgVS1, recovering 94% of its theoretical methane yield. AGIS spatial analysis of the Rhine-Ruhr metropolitan region provedthat urban biomass is locally available in sufficient quantitiesconstituting biogas potentials that are worth to utilize in digestersof municipal wastewater treatment plants.
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