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Title: Optimal sulphuric acid production using Acidithiobacillus caldus (DSM 8584): Bioprocess design for application in ion-exchange
Authors: Basitere, Moses 
Ntwampe, Seteno Karabo Obed 
Sheldon, Marshall Sheerene 
Keywords: acidithiobacillus caldus;sulphuric acid;ion-exchange;desorption;lithium 7 isotope
Issue Date: 2012
Publisher: African Journal of Biotechnology
Source: Basitere, M., Ntwampe, S.K.O. and Sheldon, M.S., 2012. Optimal sulphuric acid production using Acidithiobacillus caldus (DSM 8584): Bioprocess design for application in ion-exchange. African Journal of Biotechnology, 11(83),14946-14955.
Abstract: An optimised bioprocess was designed for the optimal production of sulphuric acid for application in an isotope recovery ion-exchange process. Firstly, the production of sulphuric acid (H2SO4) was optimised in aerated batch bioreactors using cidithiobacillus caldus (DSM 8584) using elemental sulphur, achieving H2SO4 concentration of >0.4 to ~0.5 M (0.45 M average) with the following bioprocess parameters: product yield of 3.06 (Yp/s), oxygen uptake rate of 1.35 g/ (OUR), 52% sulphur conversion at a rate of 0.83 g/ (dS°/dt), achieving a sulphuric acid production rate of 2.76 g/ (dP/dt), while the oxidation of elemental sulphur per dissolved oxygen consumed was 0.67 g S°/g O2. Secondly, after 80% (v/v) moisture loss from the recovered biological H2SO4 titres, the acid solution was used for the recovery of nuclear grade lithium 7 (7Li+) from a degraded resin, achieving >80% recovery rate within two bed volumes (60 ml) at an averaged desorption rate K¯ of 0.1829 min -1 and eluent rate of 6.65 ml.min-1 in comparison to the ~60% 7Li+ recovery rate using a commercial grade mineral H2SO4 using similar operational ion-exchange reactor parameters. The designed bioprocess proved to be an effective and environmentally friendly bioprocess for the recovery of valuable metals adsorbed onto ion-exchange resin.
ISSN: 1684-5315
Appears in Collections:Prof. Seteno Karabo Ntwampe

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