Journal
BIORESOURCE TECHNOLOGY
Volume 285, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121353
Keywords
Liquid digestate; Biomass production; Lipid productivity; Wastewater treatment; Microbial community analysis
Funding
- National Key Research and Development Program-China [2016YFB0601004]
- National Natural Science Foundation of China [21878291]
- Natural Science Foundation for Research Team of Guangdong Province, China [2016A030312007]
- National Science Foundation of Guangdong Province, China [2018A030313883]
- Pearl River S& T Nova Program of Guangzhou, China [201610010155]
- Science and Technology Program of Guangzhou, China [201804010155]
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In order to assess viability of microalgae cultivation using unsterilized dairy-derived liquid digestate (DLD) for simultaneous biofuels feedstock production and contaminant removal, four DLD concentrations (25%, 50%, 75% and 100%) were used to grow Chlorella vulgaris in batch photobioreactors (PBRs). The 25% DLD was an ideal alternative medium in that high growth rate (0.69 d(-1)), high lipid productivity (112.9 mg L-1 d(-1)) as well as high nutrient removal were attained. The high DLD concentration caused inhibition of microalgal growth, where COD was more inhibitive than ammonium. The presence of bacteria did not influence microalgae production because of limited growth. Microalgal growth reduced the richness and diversity of bacterial community. Furthermore, the species of Bacteroidetes, Candidatus Saccharibacteria, and Chlamydiae rather than Proteobacteria benefited microalgal-bacterial symbiosis. These findings contribute to better application of microalgal-bacterial system for large-scale microalgae cultivation as well as environmental sustainability.
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