Shortcut nitriflcation-denitriflcation by means of autochthonous halophilic biomass in an SBR treating fish-canning wastewater

摘要

AbstractAutochthonous halophilic biomass was cultivated in a sequencing batch reactor (SBR) aimed at analyzing the potential use of autochthonous halophilic activated sludge in treating saline industrial wastewater. Despite the high salt concentration (30 g NaCl L−1), biological oxygen demand (BOD) and total suspended solids (TSS), removal efficiencies were higher than 90%. More than 95% of the nitrogen was removed via a shortcut nitrification-denitrification process. Both the autotrophic and heterotrophic biomass samples exhibited high biological activity.The use of autochthonous halophilic biomass led to high-quality effluent and helped to manage the issues related to nitrogen removal in saline wastewater treatment.Graphical abstractDisplay OmittedHighlights•Autochthonous-halophilic biomass was derived from a real fish-canning wastewater.•Despite the high salinity, nutrient removal efficiencies over 95% were obtained.•Shortcut nitrification-denitrification resulted the main nitrogen removal mechanism.•Heterotrophic and autotrophic bacteria showed a high metabolic activity.•Strategy of cultivating autochthonous biomass ensured a high-quality effluent.