Development of algae-bacteria granular consortia in photo-sequencing batch reactor

[Display omitted] •Aerobic granules can be used as the immobilized material of eukaryotic algae.•EPS bridge function is dominant developed mechanism of the granular consortia.•Cyanobacteria will not displace the dominance of eukaryotic algae in consortia.•Competition for aerobic zone occur among aer...

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Bibliographic Details
Published in:Bioresource technology 2017-05, Vol.232, p.64-71
Main Authors: Liu, Lin, Fan, Hongyong, Liu, Yuhong, Liu, Chaoxiang, Huang, Xu
Format: Article
Language:English
Subjects:
Aerobic granules
Algae
Batch Cell Culture Techniques - instrumentation
Biodiversity
Biomass
Biomass energy
Bioreactors - microbiology
Chlorella - metabolism
Chlorophyll - analysis
Esters - analysis
Microbial Consortia
Nitrogen - isolation & purification
Phosphorus - isolation & purification
Photobioreactors - microbiology
Scenedesmus - metabolism
Sewage - microbiology
Wastewater
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Summary:[Display omitted] •Aerobic granules can be used as the immobilized material of eukaryotic algae.•EPS bridge function is dominant developed mechanism of the granular consortia.•Cyanobacteria will not displace the dominance of eukaryotic algae in consortia.•Competition for aerobic zone occur among aerobe, photoheterotrophs and algae. The development and properties of algae-bacteria granular consortia, which cultivated with the algae (Chlorella and Scenedesmus) and aerobic granules, was investigated in this experiment. The results indicated that the granular consortia could be successfully developed by selection pressure control, and the algal biomass and extracellular polymeric substances (EPS) concentration in the consortia showed notable correlation with the operating parameters of reactor. The maximum specific removal rates of total nitrogen and phosphate were obtained from the granular consortia with the highest algal biomass, yet the correlation between the fatty acid methyl esters yield and the algal biomass in the consortia was not markedly observed. The seed algae maintained dominance in the phototroph community, whereas the cyanobacteria only occupied a small proportion (5.2–6.5%). Although the bacterial communities with different operational strategies showed significant difference, the dominated bacteria (Comamonadaceae, 18.79–36.25%) in the mature granular consortia were similar.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2017.02.025