Enhancement of lipid productivity of Rhodosporidium toruloides in distillery wastewater by increasing cell density.
This study is to improve the process of producing lipid convertible to biodiesel, from distillery wastewater while simultaneously removing organics and nutrients efficiently by inoculating oleaginous yeast Rhodosporidium toruloides in the presence of indigenous microorganisms. The lipid productivity of R. toruloides was studied using real wastewater obtained from distillery and local municipal wastewater treatment plants. Under the conditions of mix rate of 1:1 with domestic wastewater, initial soluble chemical oxygen demand (SCOD) over 20,000 mg/L and initial cell density of 2×10(7) cells/mL at 30 °C, lipid content and lipid yield achieved were 43.65±1.74% and 3.54±0.04 g/L, with the associated removal efficiencies for COD, total nitrogen (TN), and total phosphorus (TP), 86.11±0.41%, 57.81±0.29%, and 67.69±0.73%, respectively, after three days of cultivation in real distillery wastewater without pH adjustment. The pH of wastewater increased from 3.71 to over 8 in 7 days of cultivation.
Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau SAR, China.
Jiayin
J
Ling
Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau SAR, China.
Saiwa
S
Nip
Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau SAR, China. Electronic address: hjshim@umac.mo.
Hojae
H
Shim
D001487:Basidiomycota / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D019649:Food Industry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D008055:Lipids / Q000737:chemistry*; D009584:Nitrogen; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid; D062065:Wastewater; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D008055:Lipids; D009584:Nitrogen; D062065:Wastewater
Biolipid; Distillery wastewater; High initial cell density; Rhodosporidium toruloides