[Treatment of oil-manufacturing wastewater by yeast-SBR system].
Eight yeast strains were applied to a sequencing batch reactor (SBR) to treat high-strength oil-containing wastewater. The removal performance, yeast cultivation method and key factors affecting the stability of system were discussed. The results show yeast sludge with MLSS of 19 g/L and SVI of 35 mL/g can be obtained in 6 d in an open system without any molds and bacteria inhibitor addition; In 30 d continuous wastewater treatment, COD and oil removal rate achieve 86.8%-96.9% and above 99.5% respectively under the influent conditions of the COD of 9000-23000 mg/L and oil of 4500-16000 mg/L; Short period of pH impact brings reversible effects on the system and the sludge retention time can affect the SVI of the yeast; Absence of nitrogen induces morphology conversion of some yeast cells from single cell to filamentous one and impairs the settling capability of the yeast.
Lü
Wen-zhou
WZ
Department of Environmental Engineering, College of Architectural Civil Engineering and Environment, Ningbo University, Ningbo 315211, China. luwenzhou@nbu.edu.cn
Liu
Ying
Y
Huang
Yi-zhen
YZ
D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D007220:Industrial Waste; D008855:Microscopy, Electron, Scanning; D010938:Plant Oils / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D015003:Yeasts / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure
D007220:Industrial Waste; D010938:Plant Oils; D012722:Sewage