Seed yeast cultivation for salad oil manufacturing wastewater treatment

Article type: Research Article

Authors: Zheng, Shao-kui | Yang, Min | Li, Pei-rui

Affiliations: State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China. E-mail:yangmin@mail.rcees.ac.cn | Faculty of Life Sciences, Henan Normal University, Henan 453002, China

Note: [] Corresponding author

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-1 led to mass death of yeast at a pH of 5. The ammonia concentration should be controlled at a level of 1000 mg l-1 or lower.

Keywords: yeast seed, sludge cultivation, nutrient, ammonia toxicity, wastewater treatment

Journal: Journal of Environmental Sciences, vol. 14, no. 1, pp. 39-43, 2002