Determination of microbial numbers in anaerobically digested biofertilisers

This study aimed to quantity total numbers of bacteria, fungi and archaea in different types of commercial liquid anaerobic digestates, and to identify common patterns in their microbial numbers post-digestion and possible implications of their use as biofertiliser. Relationships between microbial n...

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Bibliographic Details
Published in:Environmental technology 2021-02, Vol.42 (5), p.753-763
Main Authors: Coelho, Janerson Jose, Prieto, Maria Luz, Hennessy, Aoife, Casey, Imelda, Woodcock, Tony, Kennedy, Nabla
Format: Article
Language:English
Subjects:
Anaerobic digestates
Anaerobic microorganisms
Anaerobiosis
Archaea
Archaea - genetics
Bacteria
Bacteria - genetics
Biofertilizers
Carbon/nitrogen ratio
Fungi
Fungi - genetics
Microorganisms
qPCR
RNA, Ribosomal, 16S
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Summary:This study aimed to quantity total numbers of bacteria, fungi and archaea in different types of commercial liquid anaerobic digestates, and to identify common patterns in their microbial numbers post-digestion and possible implications of their use as biofertiliser. Relationships between microbial numbers and physical-chemical traits of the digestates were also investigated. Quantification was performed using culturable and molecular (quantitative PCR) approaches. Bacterial and fungal CFUs ranged up to five orders of magnitude (10 5 -10 10 ; 0-10 5 g −1 DW, respectively) between different types of anaerobic digestates. Bacterial, archaeal and fungal gene copy numbers (GCN) varied by two orders of magnitude (10 8 -10 10 ; 10 7 -10 9 ; 10 4 -10 6 g −1 DW, respectively) between digestates. All microbial variables analysed showed significant differences between the different types of anaerobic digestate investigated (p 
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2019.1645214