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Seed yeast cultivation for salad oil manufacturing wastewater treatment
Shao-kui Zheng1, Min Yang, Pei-rui Li
1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. yangmin@mail.rcees.ac.cn
Abstract:
The mixture of five yeast strains obtained from soil could remove about 85% TOC of oil-rich wastewater in batch test. While the highest MLSS was obtained at an N:C of 1:5, the oil removal decreased with the increase of N:C during yeast sludge cultivation. Ammonium chloride was the best nitrogen source for yeast cultivation from the viewpoint of yeast growth and oil utilization. An ammonia concentration of over 1300 mg/L led to mass death of yeast at a pH of 5. The ammonia concentration should be controlled at a level of 1000 mg/L or lower.