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| Influence mechanism of Porphyrobacter on flocculation harvest of Ochromonas sp. |
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| DOI： |
| KeyWord:Porphyrobacter Ochromonas sp. AOM flocculation |
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| Author Name | Affiliation | | ZHANG Bo1,2, WEN Ran2, SUN Wenxin2, SU Yanru1, REN Qin1 | 1.School of Life Science and Technology, Jining Normal University, Ulanqab 012000, Inner Mongolia, China
2. School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi′an 710021, China |
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| Abstract: |
| Harvesting microalgae cells by bioflocculation has the advantages of low toxicity, low cost and high efficiency. In order to reveal the influence mechanism of Porphyrobacter on the flocculation harvest of Ochromonas sp., the flocculation efficiency of Ochromonas sp. in BG11 medium，BG11 medium containing 5 g/L glucose (glu+BG11) pure algal system and coculture system with Porphyrobacter were compared, and the algal organic matter (AOM) yield and composition and the community structure of bacteria in the phycosphere in different systems were analyzed. The results showed that the flocculation efficiency of microalgae in BG11 and glu+BG11 pure algal culture systems were 62.40% and 19.02% respectively. The flocculation efficiency in the coculture system of Ochromonas sp. and Porphyrobacter in glu+BG11 reached 93.42%, and the AOM yield and polysaccharide yield in AOM decreased significantly. For coculture system in glu+BG11, the yield of arabinose and rhamnose in AOM increased significantly, and the type of monosaccharide in AOM was the same as BG11 system. Porphyrobacter shifted the peak of protein amide group in AOM and caused the changes of protein substances such as tryptophan and tyrosine. Compared with the pure algal culture system, Porphyrobacter could adapt to the culture system of Ochromonas sp. as the dominant bacteria, while species of Bacillus, Flavobacterium and Brevundimonas appeared. Porphyrobacter can promote the flocculation of Ochromonas sp. through reducing the AOM yield of Ochromonas sp. and affecting its composition. |
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