Screening of a Flocculant-producing Strains and Optimization on Its Cultural Conditions
Objective:To separate the floccu lant-producing bacteria with a high activity from aerobic activated sludge.Method:five strains were isolated from activated sludge.After prescreening strain Bacillus F1 with high flocculating activity was obtained.Take strain F1as the object of study,determines its fermentation fluid to the kleit suspension flocculation rate.Result:The optimum carbon and nitrogen sources are soluble starch and peptone,primary pH 7.0,the best shaking speed was 120r/min.35℃,cultivated for 72h in flakes.The strain produces a strong-activity flocculants with flocculating rate of 90 % against kaolin clay suspension.
The practice of running a bilingual experimental class based on the first-level discipline of materials science and engineering in Nanjing University of Technology is introduced in this paper.The cultivation of innovative talents was realized through establishing a set of innovative training program,relying on a team of frontier teachers,using a flexible form of teaching organization,establishing a flexible cultivation system,cultivating an international professional thinking mode,developing a batch of characteristic courses,etc.