초록
<P><B>Highlights</B></P><P>► Diluted primary piggery wastewater was treated with mixtrophic microalgae. ► Biomass productivity positively correlates to initial COD values (250–1000mg/L). ► Ammonium removal reached 90% for all diluted samples. ► Much higher lipid productivity was achieved for mixtrophic vs photoautotrophic culture.</P> <P><B>Abstract</B></P><P>Piggery wastewater that is used for microalgae cultivation has usually been treated by secondary treatment processes. The present study investigates mixotrophic cultivation of the green microalgae <I>Chlorella pyrenoidosa</I> with primary piggery wastewater that has merely been diluted before use. The biomass productivity of the microalgae exhibited a positive linear correlation with the initial COD values, which ranged from 250 to 1000mg/L. Nutrients in the piggery wastewater were removed efficiently; for example, the removal rate of ammonium was over 90% in all diluted samples. Profiles of fatty acids in the algal lipids were different after cultivation in piggery wastewater medium compared to Bristol’s solution. The maximum lipid productivity of 6.3mgL<SUP>−1</SUP>day<SUP>−1</SUP>, which was achieved when the initial COD was 1000mg/L, is not superior to other reports, but it suggests a convenient way to reduce the high organic content of piggery waste with the production of algal lipids.</P>