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From freshwater anammox bacteria (FAB) to marine anammox bacteria (MAB): A stepwise salinity acclimation process

Show simple item record Dsane, V.F. An, S. Shahid, ,M.K. Choi, Y. 2021-10-27T09:54:26Z 2021-10-27T09:54:26Z 2021
dc.description Research Article en_US
dc.description.abstract An investigation into the effect of stepwise saline introduction (3–20 g·L−1 NaCl) on the anaerobic ammonium oxidation (anammox) process in a lab-scale sequencing batch reactor was carried out for 252 days by evaluating the changes in influent and effluent nitrogen concentrations, conductivity, microbial extracellular polymeric substances' (EPS) ionic content, as well as stresses due to salinity, via microbial ATP analysis. It was observed that, effluent nitrogen concentrations remained stable at low saline levels of 3 g·L−1 to 10 g·L−1. Nonetheless, midway through 10 g·L−1 and the preliminary phase of 15 g·L−1 salinity presented a very unstable, highly fluctuating aswell as deteriorating effluent nitrogen concentrations. A more satisfactory nitrogen removal efficiency of 83.7±5.9%was obtained at higher saline concentrations implying that, the adaptation mechanismto tolerate increasing salinitywas taking place. Saline induced stress,which measures the variation in viable anammox bacteria, was correlative to the formation of EPS and changes in its cationic contents along the increasing salinity. Although the specific anammox activity (SAA) dropped by approximately 15% fromthe beginning of the process to themidpoint, the drop in SAA after the midpoint was not as drastic as the initial phase. A change in microbial aggregation and dominance proved the existence of newsaline-dependent species that canwithstand high saline stresses. Recovery from abrupt high saline shocks in batch experiment was seen to be almost impossible. en_US
dc.language.iso en en_US
dc.publisher Science of the Total Environment en_US
dc.subject Adaptation-mechanism en_US
dc.subject FAB en_US
dc.subject MAB en_US
dc.subject Saline induced stress (SIS) en_US
dc.title From freshwater anammox bacteria (FAB) to marine anammox bacteria (MAB): A stepwise salinity acclimation process en_US
dc.type Article en_US

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