Effect of the particle size on the ammonia removal rate and the bacterial community composition of bioflocs |
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| Institution: | 1. Shanghai Engineering Research Center of Aquaculture (Shanghai Science and Technology Committee), Shanghai Ocean University, Shanghai 201306, China;2. Key Laboratory of Freshwater Aquatic Genetic Resources (Ministry of Agriculture of PRC), Shanghai Ocean University, Shanghai 201306, China;3. National Demonstration Center for Experimental Fisheries Science Education (Ministry of Education of PRC), Shanghai Ocean University, Shanghai 201306, China;1. College of Fisheries and Life Sciences of Shanghai Ocean University, Shanghai 201306, China;2. Research and Development Center of Aquacultural Engineering of Shanghai, Shanghai 201306, China;3. Shanghai Collaborative Innovation Center for Aquatic Animal Genetics and Breeding, Shanghai 201306, China;1. Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, 100 East Daxue Road, Nanning 530004, China;2. Coral Reef Research Center of China, Guangxi University, 100 East Daxue Road, Nanning 530004, China;3. School of Marine Sciences, Guangxi University, 100 East Daxue Road, Nanning 530004, China;4. School of Environment, Guangxi University, 100 East Daxue Road, Nanning 530004, China |
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| Abstract: | The total ammonia nitrogen (TAN) removal efficiency and bacterial community composition of bioflocs with <50-μm particle size, > 50-μm particle size and un-sieved bioflocs were investigated in the current study. The initial ratio of dissolved organic carbon to TAN (DOC/TAN) in the three groups were about 14:1. No significant difference was found in the removal rate of TAN, average concentrations of TAN and nitrite nitrogen among the three groups (P > 0.05). The C/N (w/w) ratio of the > 50-μm bioflocs was significantly higher than those of the other groups. No significant differences were found in the crude protein content in the bioflocs among the three groups. The development of the bacterial community compositions of the bioflocs was analyzed by Illumina MiSeq sequencing analyses. Most OTUs were shared among the three groups at all the sampled time points. With the increase in the relative abundance of phylum Firmicutes, that of phylum Proteobacteria, Chorolexi, and Bacteroidetes decreased in all the three groups. The phylum Firmicutes and genus Bacillus were predominant in all the sampled time points. At the end of the experiment, genus Bacillus accounted for 81% in the < 50-μm group, 82% in the > 50-μm group, and 75% in the un-sieved group. |
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| Keywords: | Bioflocs aquaculture system Particle size Nitrification Microbial community Total ammonia nitrogen |
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