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Effect of iron and manganese on ammonium removal from micro-polluted source water by immobilized HITLi7T at 2 °C

Zheng, Zejia, Li, Weiguang, Zhang, Duoying, Qin, Wen, Zhao, Yi, Lv, Longyi
Bioresource technology 2019 v.285 pp. 121367
Acinetobacter, Fourier transform infrared spectroscopy, activated carbon, ammonium, ammonium nitrogen, biomass, enzyme activity, fluorescence emission spectroscopy, iron, manganese, moieties, polymers, polysaccharides, pretreatment, secretion
In this study, trace metals (Fe & Mn) were applied to enhance NH4+-N removal in source water at 2 °C, and 22.7% of initial 2.20 mg/L NH4+-N was removed by pre-treating granular activated carbon (GAC) with Fe & Mn before immobilizing Acinetobacter harbinensis HITLi7T to form biological activated carbon (BAC). Biomass and dehydrogenase activity (DHA) on this modified BAC were 2.80 × 108 CFU/g-DW C and 0.50 mg/L/g-DW C, respectively, both the highest. Additionally, 4.76 times more biomass and 9.76 times higher DHA of HITLi7T were observed in the cultivation with Fe & Mn dosing. Extracellular polymeric substances (EPS) measurements found Fe & Mn dosing could increase total EPS amount (44.3% higher) and polysaccharide (PS) ratio (1.50% higher) secreted by HITLi7T. According to the results of 3D-excitation-emission matrix (3D-EEM) fluorescence spectra and infrared spectra (FTIR) analysis, Fe and Mn promoted the secretion of tryptophan-like substances and changed functional groups COH, COC, CO and COOH, which are associated with protein and PS.