Mechanisms of ammonia, calcium and heavy metal removal from nutrient-poor water by Acinetobacter calcoaceticus strain HM12.

Junfeng Su, Amjad Ali, Xuan Li, Lingfei Zhang, Zhao Wang

Journal: Journal of environmental management 2024;351():119912

PMID: 38176381

Full Text on Elsevier Science View on PubMed

Abstract

An Acinetobacter calcoaceticus strain HM12 capable of heterotrophic nitrification-aerobic denitrification (HN-AD) under nutrient-poor conditions was isolated, with an ammonia nitrogen (NH-N) removal efficiency of 98.53%. It can also remove heavy metals by microbial induced calcium precipitation (MICP) with a Ca removal efficiency of 75.91%. Optimal conditions for HN-AD and mineralization of the strain were determined by kinetic analysis (pH = 7, C/N = 2.0, Ca = 70.0 mg L, NH-N = 5.0 mg L). Growth curves and nitrogen balance elucidated nitrogen degradation pathways capable of converting NH-N to gaseous nitrogen. The analysis of the bioprecipitation showed that Zn and Cd were removed by the MICP process through co-precipitation and adsorption (maximum removal efficiencies of 93.39% and 80.70%, respectively), mainly ZnCO, CdCO, ZnHPO, Zn(PO) and Cd(PO). Strain HM12 produces humic and fulvic acids to counteract the toxicity of pollutants, as well as aromatic proteins to increase extracellular polymers (EPS) and promote the biomineralization process. This study provides a experimental evidence for the simultaneous removal of multiple pollutants from nutrient-poor waters.

Address: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China. Electronic address: [email protected].; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China. Electronic address: [email protected].; College of Environmental Science & Engineering, Yancheng Institute of Technology, Yancheng, 224051, China.

DOI: 10.1016/j.jenvman.2023.119912

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MeSH Terms: Ammonia, Denitrification, Acinetobacter calcoaceticus, Calcium, Nitrites, Kinetics, Cadmium, Aerobiosis, Nitrification, Metals, Heavy, Nitrogen, Heterotrophic Processes, Nutrients, Environmental Pollutants