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Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes
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Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes
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Journal Article
Feasibility study of biogas upgrading coupled with nutrient removal from anaerobic effluents using microalgae-based processes
2016
Overview
The present research was conducted to simultaneously optimize biogas upgrading and carbon and nutrient removal from centrates in a 180-L high-rate algal pond interconnected to an external CO
2
absorption unit. Different biogas and centrate supply strategies were assessed to increase biomass lipid content. Results showed 99 % CO
2
removal efficiencies from simulated biogas at liquid recirculation rates in the absorption column of 9.9 m
3
m
−2
h
−1
, concomitant with nitrogen and phosphorus removal efficiencies of 100 and 82 %, respectively, using a 1:70 diluted centrate at a hydraulic retention time of 7 days. The lipid content of the harvested algal–bacterial biomass remained low (2.9–11.2 %) regardless of the operational conditions, with no particular trend over time. The good settling characteristics of the algal–bacterial flocs resulted in harvesting efficiencies over 95 %, which represents a cost-effective alternative for algal biomass reutilization compared to conventional physical–chemical techniques. Finally, high microalgae biodiversity was found regardless of the operational conditions.
