Increased loading stress leads to convergence of microbial communities and high methane yields in adapted anaerobic co-digesters

Enhancing biogas production, while avoiding inhibition of methanogenesis during co-digestion of grease interceptor waste (GIW), can help water resource recovery facilities reduce their carbon footprint. Here we used pre-adapted and non-adapted digesters to link microbial community structure to diges...

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Veröffentlicht in:Water research (Oxford) 2020-02, Vol.169, p.115155-115155, Article 115155
Hauptverfasser: Wang, Ling, Hossen, Elvin H., Aziz, Tarek N., Ducoste, Joel J., de los Reyes, Francis L.
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container_title Water research (Oxford)
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creator Wang, Ling
Hossen, Elvin H.
Aziz, Tarek N.
Ducoste, Joel J.
de los Reyes, Francis L.
description Enhancing biogas production, while avoiding inhibition of methanogenesis during co-digestion of grease interceptor waste (GIW), can help water resource recovery facilities reduce their carbon footprint. Here we used pre-adapted and non-adapted digesters to link microbial community structure to digester function. Before disturbance, the pre-adapted and non-adapted digesters showed similar methane production and microbial community diversity but dissimilar community composition. When exposed to an identical disturbance, the pre-adapted digester achieved better performance, while the non-adapted digester was inhibited. When re-exposed to disturbance after recovery, communities and performance of both digesters converged, regardless of the temporal variations. Co-digestion of up to 75% GIW added on a volatile solids (VS) basis was achieved, increasing methane yield by 336% from 0.180 to 0.785 l-methane/g-VS-added, the highest methane yield reported to date for lipid-rich waste. Progressive perturbation substantially enriched fatty acid-degrading Syntrophomonas from less than 1% to 24.6% of total 16S rRNA gene sequences, acetoclastic Methanosaeta from 2.3% to 11.9%, and hydrogenotrophic Methanospirillum from less than 1% to 6.6% in the pre-adapted digester. Specific hydrolytic and fermentative populations also increased. These ecological insights demonstrated how progressive perturbation can be strategically used to influence methanogenic microbiomes and improve co-digestion of GIW. [Display omitted] •Progressive perturbation increased methane yield by 336% for FOG co-digestion.•Relative abundances of Syntrophomonas and methanogens were enriched.•Specific hydrolytic and fermentative populations increased.•Adaptation history was key to enhancing FOG co-digestion.
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subjects Adaptation history
Anaerobic co-digestion
Anaerobiosis
Bioreactors
Fat, oil and grease (FOG)
Grease interceptor waste
Methane
Microbial community dynamics
Microbiota
Perturbation
RNA, Ribosomal, 16S
Sewage
title Increased loading stress leads to convergence of microbial communities and high methane yields in adapted anaerobic co-digesters
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