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A bioflocculant-producing bacterium,  Bacillus megaterium  SP1, was isolated from biofloc in pond water and identified by using both 16S rDNA sequencing analysis and a Biolog GEN III MicroStation System. The optimal carbon and nitrogen sources for  Bacillus megaterium  SP1 were 20 g L −1  of glucose and 0.5 g L −1  of beef extract at 30°C and pH 7. The bioflocculant produced by strain SP1 under optimal culture conditions was applied into aquaculture wastewater treatment. The removal rates of chemical oxygen demand (COD), total ammonia nitrogen (TAN), and suspended solids (SS) in aquaculture wastewater reached 64, 63.61, and 83.8%, respectively. The volume of biofloc (FV) increased from 4.93 to 25.97 mL L −1 . The addition of  Bacillus megaterium  SP1 in aquaculture wastewater could effectively improve aquaculture water quality, promote the formation of biofloc, and then form an efficient and healthy aquaculture model based on biofloc technology.

biomed research international

Isolation, Identification, and Optimization of Culture Conditions of a Bioflocculant-Producing Bacterium<i>Bacillus megaterium</i>SP1 and Its Application in Aquaculture Wastewater Treatment

Isolation, Identification, and Optimization of Culture Conditions of a Bioflocculant-Producing BacteriumBacillus megateriumSP1 and Its Application in Aquaculture Wastewater Treatment