Nutrients removal from secondary treated wastewater using a membrane photobioreactor for microalgae cultivation
- Nutrients removal from secondary treated wastewater using a membrane photobioreactor for microalgae cultivation
- 송경근; 오해석; 조강우; 안규홍; 조진우
- Microalgae; membrane photobioreactor; wastewater treatment; nutrient removal
- Issue Date
- IWA MTWR 2010
- This study was conducted to evaluate the feasibility of nutrient removal from secondary treated
wastewater and cultivation microalgae biomass in high concentration for bioenergy resource in membrane
photobioreactors (MPBRs). In this study, lab-scale MPBRs were operated to cultivate microalgae with secondary
treated wastewater. Three species of microalgae were cultivated. The wastewater was continuously supplied to
the reactor and the effluent was filtered out through a microfilter membrane, which was submerged in the
reactor. Air was continuously supplied with diffusers settled underneath the membrane for purposes of supplying
CO2 and preventing membrane fouling. During the experiment, microalgae biomass was successively cultivated
in the MPBRs. The highest concentration of microalgae biomass in the reactor was 2,500 mg/L and 280 mg/m3
as SS and chlorophyll-a, respectively. The maximum specific yield rate was 0.72 d-1. TN removal efficiency kept
above 60%, although dependent in microalgal species. However, compare to nitrogen removal, phosphorus
removal was not so excellent as a whole. Average TP removal efficiency during the experiment was about 40%.
Lipid content of microalgae biomass cultivated with secondary treated wastewater in the MPBRs was 35% as
w/w for Ankistrodesmus gracillis. Based on the result, cultivation of microalgae with secondary treated
wastewater in the membrane photobioreactor was feasible for production of biomass as bioenergy resources and
for nutrient removal from wastewater, in general.
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