Use of additives to improve collective biogas plant performances: A comprehensive review

Elsevier

Available online 16 March 2023, 108129

Biotechnology AdvancesAuthor 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.

Abstract

Nowadays, 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.

Keywords

Additives

Anaerobic digestion

Bioaugmentation

Carbon-based materials

Collective biogas plant

CSTR

Enzyme

Performances

Trace metals

AbbreviationsBMP

Biochemical methane potential

COD

Chemical oxygen demand

CSTR

Continuous stirred-tank reactor

DIET

Direct interspecies electron transfer

FOS

Volatile organic acids

GAC

Granular activated carbon

HRT

Hydraulic retention time

LCFA

Long chain fatty acid

OFMSW

Organic fraction of solid waste

SAOB

Syntrophic acetate oxidizing bacteria

TAN

Total ammonia nitrogen

TIC

Total Inorganic Carbon

TKN

Total Kjeldahl Nitrogen

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