Abstract
Anaerobic digestion (AD) is considered an important brick of the circular economy allowing to treat and stabilize organic residues, produce renewable energy and promote the return to soil of organic matter and mineral nutrients. Digestate has been historically seen as a biogas by-product with a fertilizing value while representing a significant cost sector to AD plant operators. A paradigm shift is now necessary as other renewable energy sources with lowering production costs tend to disrupt an AD economic model greatly relying on subsidized biogas valorisation either via electricity or purification to biomethane. This chapter is focused on digestate post-treatments allowing to generate value-added products while closing and enhancing the loop between major agricultural inputs and outputs, the latter being indirectly present in digestates. Several options exist to generate mineral fertilizers, soil amendments, organo-mineral fertilizers, biostimulants, biocontrol products, energy and beyond from digestate. Consumer behaviour and regulatory framework evolution are necessary for increasing the demand and enabling a more sustainable agriculture based on biosourced upcycled materials. A major global milestone has been recently achieved as the EU has introduced a new fertilizer regulation (CE 2019/1009) that will tend to boost the commercialisation of digestate-based products within the world’s largest common market.
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Abbreviations
- ABP:
-
Animal by-products
- AD:
-
Anaerobic digestion
- APL:
-
Aqueous pyrolysis liquid
- Bt:
-
Bacillus thuringiensis
- CMC:
-
Component material categories of EU regulation CE 2019/1009
- CSTR:
-
Continuous stirred-tank reactor
- DM:
-
Dry matter
- EU:
-
European Union
- LF:
-
Digestate liquid fraction after phase separation
- MBT:
-
Mechanical biological treatment
- OFMSW:
-
Organic fraction of municipal solid waste (here defined as obtained from mixed-collection after MBT)
- OM:
-
Organic matter
- PAH:
-
Polycyclic aromatic hydrocarbons
- PCB:
-
Polychlorinated biphenyls
- PFC:
-
Product function categories of EU regulation CE 2019/1009
- PFR:
-
Plug flow reactor
- R&D:
-
Research and development
- SF:
-
Digestate solid fraction after phase separation
- SHF:
-
Separate hydrolysis and fermentation
- SSF:
-
Simultaneous saccharification and fermentation
- TAN:
-
Total ammoniacal nitrogen
- VFA:
-
Volatile fatty acids
- WWTP:
-
Wastewater treatment plant
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Guilayn, F., Jimenez, J., Monlau, F., Vaneeckhaute, C. (2022). Valorisation of Anaerobic Digestate: Towards Value-Added Products. In: Sinharoy, A., Lens, P.N.L. (eds) Renewable Energy Technologies for Energy Efficient Sustainable Development. Applied Environmental Science and Engineering for a Sustainable Future. Springer, Cham. https://doi.org/10.1007/978-3-030-87633-3_9
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