Investigation of ferrous-iron biooxidation kinetics by Leptospirillum ferriphilum in a novel packed-column bioreactor: Effects of temperature and jarosite accumulation

A Comparative Study on the Effect of Flotation Reagents on Growth and Iron Oxidation Activities of Leptospirillum ferrooxidans and Acidithiobacillus ferrooxidans

“…(4)- (6)). Jarosite precipitation is perceived as an unwanted interaction [40]. On the other hands, the positive value of T Fe Δ may be explained by the positive effect of reagents on the biooxidation activities, which can decrease the precipitation of iron into the medium.…”

“…Lower Fe T than the control test (−∆ Fe T ) in the presence of collectors can be described by their inhibition effects, as they lead to the precipitation of jarosite and other ferric oxides and hydroxides (Equations (4)- (6)). Jarosite precipitation is perceived as an unwanted interaction [40]. On the other hands, the positive value of ∆ Fe T may be explained by the positive effect of reagents on the biooxidation activities, which can decrease the precipitation of iron into the medium.…”

Charge transfer between biogenic jarosite derived Fe 3+ and TiO 2 enhances visible light photocatalytic activity of TiO 2

“…Although a low solution pH minimises the precipitate, precipitation becomes significant over extended period of continuous operation, which is typical of bioleach systems (Chowdhury and Ojumu, 2014). Moreover, acidic dissolution of gangue materials at low pH condition may increase the solution pH, resulting in the formation of various forms of ferric precipitates within the heap bed (Watling, 2006).…”

“…Precipitation of jarosite is often perceived as an unwanted phenomenon, its accumulation may lead to kinetic barriers by hindering the mass transfer of ions, i.e. Cu 2+ , Fe 2+ , to solution and also by restricting bacterial and Fe 3+ access to the mineral sulphide surface (Chowdhury and Ojumu, 2014;Boon and Heijnen, 1993;Ojumu and Petersen, 2011). This leads to decrease in bioleaching efficiency and increased cost.…”

The effect of ferrous iron ion concentration on activity of iron-oxidizing microorganisms

“…Было показано, что наиболее эффективно выщелачивание трехвалентным железом при температурах 40-80°C [2][3][4][5][6][7]. При этом большая часть исследований закономерностей биоокисления железа выполнена при температурах 25-37°C [8,9]. Данных о возможности проведения процессов регенерации железа при температурах выше 40°С в лите- Литература…”