Nutrients removal from secondary treated wastewater using a membrane photobioreactor for microalgae cultivation

Title
Nutrients removal from secondary treated wastewater using a membrane photobioreactor for microalgae cultivation
Authors
송경근오해석조강우안규홍조진우
Keywords
Microalgae; membrane photobioreactor; wastewater treatment; nutrient removal
Issue Date
2010-10
Publisher
IWA MTWR 2010
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/38452
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KIST Publication > Conference Paper
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