Enhanced refractory organics removal by sponge iron-coupled microbe technology: performance and underlying mechanism analysis

Aerobic Denitrification Enhanced by Immobilized Slow-Released Iron/Activated Carbon Aquagel Treatment of Low C/N Micropolluted Water: Denitrification Performance, Denitrifying Bacterial Community Co-occurrence, and Implications

“…Zero-valent iron could induce microbial bioreduction in neutral or alkaline aquatic ecosystems . As a critical inorganic electron donor, the iron ions released into the water would advance the biological activity of microorganisms. ,, Previous studies have shown that the release of iron ions could promote the synthesis of denitrifying functional genes and further stimulate the expression of relative enzymes. ,,, Inorganic electron donors could induce changes in the structure of the microorganism’s community, leading to the evolution of the function of the microbial community by some facultative denitrifying bacteria occupying a more dominant ecological niche. , …”

“…29,32,42 Previous studies have shown that the release of iron ions could promote the synthesis of denitrifying functional genes and further stimulate the expression of relative enzymes. 2,26,43,44 Inorganic electron donors could induce changes in the structure of the microorganism's community, leading to the evolution of the function of the microbial community by some facultative denitrifying bacteria occupying a more dominant ecological niche. 2,43 pH and DO play a crucial role in the aerobic denitrification processes.…”

Degradation of different wastewater by a biological sponge iron system: microbial growth and influencing factors

“…A signicant amount of Fe(II) and H 2 O 2 was detected at the beginning of the reaction as the SFe continuously corroded. 19,44,45 It initiated the Fenton reaction between Fe(II) and H 2 O 2 , resulting in the sustained generation of hydroxyl free radicals and hydroxyl free radicals exhibited strong reactivity towards the toxic functional groups of pollutants. It's imperative to recognize that SFe contributes to the evolution of microorganisms into obligate degradation bacteria for different types of wastewater.…”

“…Furthermore, in the treatment of AN rand NB wastewater, a gradual increase in the concentration of AN and NB during the initial domestication phase was employed. 19,22 All the reactors in batch experiments were conducted in 500 mL conical asks. It was replaced by 20 mL of bacterialsludge mixture and 180 mL of synthetic wastewater.…”

“…The synthetic NB wastewater was prepared with Na 2 HPO 4 ·12H 2 O (3800 mg L −1 ), KH 2 PO 4 (1000 mg L −1 ), NaCl (1000 mg L −1 ), MgSO 4 ·7H 2 O (200 mg L −1 ), NH 4 Cl (100 mg L −1 ), NB (300 mg L −1 ). 19 Unless otherwise indicated, all chemicals used were analytical grade.…”