Effects of solid-phase denitrification on the nitrate removal and bacterial community structure in recirculating aquaculture system |
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| Authors: | Tianlei Qiu Lili Liu Min Gao Lanhe Zhang Haireti Tursun Xuming Wang |
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| Institution: | 1.Beijing Engineering Research Center of Environmental Material for Water Purification,Beijing University of Chemical Technology,Beijing,People’s Republic of China;2.Beijing Agro-Biotechnology Research Center, Beijing Key Laboratory of Agricultural Genetic Resources and Biotechnology,Beijing Academy of Agriculture and Forestry Sciences,Beijing,People’s Republic of China;3.School of Chemical Engineering,Northeast Dianli University,Jilin,People’s Republic of China;4.Heihe Hydrology Bureau of Heilongjiang Province,Heihe,People’s Republic of China |
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| Abstract: | A solid-phase denitrification (SPD) reactor packed with poly (3-hydroxybutyrate-co-3-hydroxyvalerate) as a carbon source was incorporated into a recirculating aquaculture system (RAS) to remove accumulated nitrate. Bacterial community structures in different parts of the RAS, including biofilter unit, SPD reactor, and culture water, were analyzed using Illumina MiSeq sequencing technology. The data showed that nitrate levels decreased remarkably in the RAS connected with SPD reactor (RAS-DR). In contrast, nitrate levels increased continuously in the conventional RAS without SPD reactor (RAS-CK). Biofilter unit and culture water in RAS-DR developed lower species richness and higher bacterial community diversity than that in RAS-CK. The bacterial community structure of RAS was significantly affected by the SPD process and the changes included an increase in the proportion of Proteobacteria and Firmicutes and a decrease in Nitrospira abundance in RAS-DR. Firmicutes was the most abundant phylum (56.9 %) and mainly consisted of Clostridium sensu stricto (48.3 %) in SPD reactor. |
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