Abstract:To expand the strain pool of oil degradation and to improve the biotransformation efficiency of oil in food waste, 4 microbial strains preserved in the laboratory were used as lipase degrading bacteria, the compound oil-removing microbial agent was obtained by equal proportion mixture of the 4 strains. The factors affecting oil removal and lipase production ability of the different strains were investigated. The results showed that the compound oil-removing microbial agent had oil-removing ability at temperature 25~55 ℃, pH 4~9, salt content 5~90 g/L, oil concentration 1%~5%, inoculum 1%~9%, and the degradation rate of oil can reach up to 84.75%. The results of the single strain experiments showed that the strain B501 had the highest lipase activity, while strain 009 had the strongest oil removal ability because of its longer duration of high lipase activity. Also, the oil removal effect of compound bacteria is better than that of a single strain.
