Available online 16 March 2023, 108129
Author links open overlay panel, , , , Highlights•Review of specificities and limitations of collective biogas plants.
•Interest of additives to enhance anaerobic digestion performances.
•Review of addition of microorganisms, enzymes, and inorganic additives in digester.
•Focus on co-digestion, continuous or semi-continuous reactors.
•Need of further studies at larger scale to be compatible with industrial application.
AbstractNowadays, anaerobic digestion (AD) is being increasingly encouraged to increase the production of biogas and thus of biomethane. Due to the high diversity among feedstocks used, the variability of operating parameters and the size of collective biogas plants, different incidents and limitations may occur (e.g., inhibitions, foaming, complex rheology). To improve performance and overcome these limitations, several additives can be used. This literature review aims to summarize the effects of the addition of various additives in co-digestion continuous or semi-continuous reactors to fit as much as possible with collective biogas plant challenges. The addition of (i) microbial strains or consortia, (ii) enzymes and (iii) inorganic additives (trace elements, carbon-based materials) in digester is analyzed and discussed. Several challenges associated with the use of additives for AD process at collective biogas plant scale requiring further research work are highlighted: elucidation of mechanisms, dosage and combination of additives, environmental assessment, economic feasibility, etc.
KeywordsAdditives
Anaerobic digestion
Bioaugmentation
Carbon-based materials
Collective biogas plant
CSTR
Enzyme
Performances
Trace metals
AbbreviationsBMPBiochemical methane potential
CODChemical oxygen demand
CSTRContinuous stirred-tank reactor
DIETDirect interspecies electron transfer
FOSVolatile organic acids
GACGranular activated carbon
HRTHydraulic retention time
LCFALong chain fatty acid
OFMSWOrganic fraction of solid waste
SAOBSyntrophic acetate oxidizing bacteria
TANTotal ammonia nitrogen
TICTotal Inorganic Carbon
TKNTotal Kjeldahl Nitrogen
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