Abstract
This study examined the co-immobilization of the cyanobacterium Synechococcus elongatus with the plant growth-promoting bacterium Azospirillum brasilense in alginate beads and its potential application for the removal of phosphorus from aquaculture wastewater. Co-immobilization of both microorganisms significantly increased the cell density of S. elongatus (2852.5 × 104 cells mL−1) compared with that of immobilization of cyanobacteria alone (1325.2 × 104 cells mL−1). Chlorophyll a content was similar in co-immobilized (11.1 ± 3.5 pg cell−1) and immobilized S. elongatus (14.5 ± 4.9 pg cell−1). Azospirillum brasilense showed continuous growth until day 2, after which its cell concentration declined until the end of the assay. Co-immobilized S. elongatus removed more phosphorus (44.8 %) than immobilized cyanobacteria cells alone (32.0 %). In conclusion, phosphate removal was greater with free cells of S. elongatus but overlapped with the values that were obtained with the treatment of co-immobilization of cells. Our results demonstrate that A. brasilense enhances the growth of S. elongatus and improves its removal of phosphorus when they are co-immobilized in alginate beads compared with only immobilization of cyanobacteria cells alone.
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Acknowledgments
This study was supported by Consejo Nacional de Ciencia y Tecnología de México (CONACyT Project 130074). The first author acknowledges a CONACyT special scholarship. Thanks to Ceres Molina-Cárdenas for the technical assistance and thanks to Blue Pencil Science for English editing.
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Ruiz-Güereca, D.A., Sánchez-Saavedra, M.d.P. Growth and phosphorus removal by Synechococcus elongatus co-immobilized in alginate beads with Azospirillum brasilense . J Appl Phycol 28, 1501–1507 (2016). https://doi.org/10.1007/s10811-015-0728-9
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DOI: https://doi.org/10.1007/s10811-015-0728-9