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Characterization of microbial community dynamics during the anaerobic co-digestion of thermally pre-treated slaughterhouse wastes with glycerin addition

  • Á. Rodríguez-AbaldeEmail author
  • M. Guivernau
  • F. X. Prenafeta-Boldú
  • X. Flotats
  • B. Fernández
Research Paper

Abstract

Microbial community dynamics during the anaerobic co-digestion of pig manure, pasteurized slaughterhouse waste and glycerin were studied in a lab-scale CSTR. The feed composition was optimized through progressive co-substrate additions for enhanced methane production and organic matter removal without accumulation of intermediate compounds. Microbial community structure of biomass samples was studied by means of qPCR and DGGE profiling of 16S rRNA genes (Bacteria and Archaea), and genus-specific qPCR of the methyl coenzyme M reductase gene (mcrA), which encodes for an enzyme universally involved in methanogenesis. The composition of the dominant bacterial populations remained relatively stable, when compared to those in the influent, but the highest changes were observed upon the introduction of glycerin. Biodiversity of archaea was restricted to a few representatives of the genera Methanosaeta and Methanosarcina, but Methanospirillum sp. was detected only when glycerin was introduced in the feeding. Glycerin supplementation coincided with the strongest increase in methane yield (from 0.22 to 0.64 m3CH4 m−3 d−1).

Keywords

Co-digestion Microbial community Slaughterhouse waste 16S rDNA DGGE profiling qPCR of mcrA functional genes 

Abbreviations

ABP

Animal by-products

CODt

Total chemical oxygen demand

CSTR

Continuous stirred tank reactor

DGGE

Denaturing gradient gel electrophoresis

HRT

Hydraulic retention time

mcrA

Methyl-coenzyme M reductase

Msar

Methanosarcinaceae

Msae

Methanosaetaceae

LCFA

Chain fatty acids

OLR

Organic loading rate

PCR

Polymerase chain reaction

PM

Pig manure

PP-ABP

Pasteurized animal by-product

qPCR

Quantitative time PCR

RG

Residual glycerin

rRNA

Ribosomal ribonucleic acid

TA

Total alkalinity

TS

Total solids

VFA

Volatile fatty acids

VS

Volatile solids

Notes

Acknowledgements

This work was supported by the Spanish Ministry of Science and Innovation (project PROBIOGAS PSE-120000–2008-57v). The support of the CERCA Program and of the Consolidated Research Group TERRA (ref. 2017 SGR 1290), both from the Generalitat de Catalunya, is also acknowledged.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Á. Rodríguez-Abalde
    • 1
    • 2
    Email author
  • M. Guivernau
    • 2
  • F. X. Prenafeta-Boldú
    • 2
  • X. Flotats
    • 3
  • B. Fernández
    • 2
  1. 1.EnergyLabVigoSpain
  2. 2.GIRO ProgramInstitute of Agrifood Research and Technology (IRTA)BarcelonaSpain
  3. 3.GIRO Joint Research Unit IRTA-UPC, Department of Agrifood Engineering and BiotechnologyUniversitat Politècnica de Catalunya (UPC)BarcelonaSpain

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