Title :
Two-stage treatment of edible oil-containing wastewater: Yeast coupled with activated sludge unit
Author :
Lv, Wen-zhou ; Liu, Ying ; Yu, Yi-tong
Author_Institution :
Dept. of Environ. Eng., Ningbo Univ., Ningbo, China
Abstract :
Two Sequencing Batch Reactors (SBRs) were coupled to treat edible-oil containing wastewater directly. Ten yeast strains were inoculated to the first SBR to treat high-strength oil-containing wastewater. The effluents of the system were further degraded by activated sludge in the second SBR. The results show that each yeast can efficiently decompose edible oil-containing wastewater with the COD removal rate above 80%; The mixture of ten yeast stain can cultivated in an open system without any molds and bacteria inhibitor addition to produce yeast biomass which processes a good settle ability. In 100 day continuous wastewater treatment by the first stage, COD and Oil removal rate achieve 88.9-97.5% and 93.4-99.9% respectively under the influent conditions of the COD of 9500-24000 mg/L and Oil of 3300-14000 mg/L. The effluent with COD varied from 300 to 700mg/L was treated by the second stage and the final effluent of COD was below 100 mg/L which meets the standards for wastewater discharge.
Keywords :
effluents; sludge treatment; wastewater; wastewater treatment; activated sludge unit; bacteria inhibitor addition; edible oil; effluent; oil removal rate; sequencing batch reactor; wastewater discharge; wastewater treatment; yeast biomass; yeast strains; Biodegradation; Board of Directors; Degradation; Effluents; Manufacturing; Wastewater; Wastewater treatment; activated sludge; oil-containing wastewater; two-stage SBR; wastewater treatment; yeast;
Conference_Titel :
Remote Sensing, Environment and Transportation Engineering (RSETE), 2011 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-9172-8
DOI :
10.1109/RSETE.2011.5964660