Title:
Discontinuous 2-Stage Dry Digestion for Solid Organic Waste
Author(s):
Großmann, J., Hilse, H., Springer, J.
Document(s):
Paper
Slide presentation
Abstract:
Discontinuous Dry Digestion (DDD) as part of sustainable waste management systems bears high potential to reduce the amount of organics landfilled worldwide and entails twofold benefit for the reduction of global greenhouse gas emissions. Diffuse landfill gas emissions can be reduced significantly and the produced biogas substitute fossil fuels. Compared to fully mixed and plug flow wet digestion processes, mechanical pre-treatment of mixed solid waste streams is very simple for DDD comparable to aerobic stabilization/composting processes. Anaerobic bacteria selectively degrade organics and with the discontinuous concept the non-degradable part is simply brought out of the process as solid digestate in batches. Post-treatment of the solid residues as well is much simpler as for digestate sludge making solid waste treatment concepts using DDD comparably cost efficient. Amongst the industrialized DDD processes the GICON-Process is the only two stage process on the market. The discontinuous solid waste treatment using the principle of percolation is designated to derive a COD-enriched percolate by hydrolysis which is transferred to a high performance fixed bed reactor for biological methanation. Advantages to the so far wider spread single stage processes are higher efficiency of the installed reactor volume, more stable processing, less disposition for silting of digestate, very high methane concentration in biogas from the methane reactor, controllability of biogas production and less incrustation of pipes and aggregates.
Keywords:
anaerobic digestion, biogas, fixed bed, municipal solid waste (MSW), organic waste, hydrolysis
Topic:
Industry Sessions
Subtopic:
Biological-Biogas/BioCH4
Event:
22nd European Biomass Conference and Exhibition
Session:
IBO.8.2
Pages:
1657 - 1665
ISBN:
978-88-89407-52-3
Paper DOI:
10.5071/22ndEUBCE2014-IBO.8.2
Price:
FREE
