Abstract:
:Acclimatized anaerobic communities to high ammonia levels can offer a solution to the ammonia toxicity problem in biogas reactors. In the current study, a stepwise acclimation strategy up to 10g NH4+-N L-1, was performed in mesophilic (37±1°C) continuously stirred tank reactors. The reactors were co-digesting (20/80 based on volatile solid) cattle slurry and microalgae, a protein-rich, 3rd generation biomass. Throughout the acclimation period, methane production was stable with more than 95% of the uninhibited yield. Next generation 16S rRNA gene sequencing revealed a dramatic microbiome change throughout the ammonia acclimation process. Clostridium ultunense, a syntrophic acetate oxidizing bacteria, increased significantly alongside with hydrogenotrophic methanogen Methanoculleus spp., indicating strong hydrogenotrophic methanogenic activity at extreme ammonia levels (>7g NH4+-N L-1). Overall, this study demonstrated for the first time that acclimation of methanogenic communities to extreme ammonia levels in continuous AD process is possible, by developing a specialised acclimation AD microbiome.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Tian H,Fotidis IA,Mancini E,Treu L,Mahdy A,Ballesteros M,González-Fernández C,Angelidaki Idoi
10.1016/j.biortech.2017.09.148subject
Has Abstractpub_date
2018-01-01 00:00:00pages
616-623eissn
0960-8524issn
1873-2976pii
S0960-8524(17)31713-3journal_volume
247pub_type
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