title: Effect of calcium oxide on the efficiency of ferrous ion oxidation and total iron precipitation during ferrous ion oxidation in simulated acid mine drainage treatment with inoculation of Acidithiobacillus ferrooxidans.
abstract: Calcium oxide was added into ferrous ion oxidation system in the presence of Acidithiobacillus ferrooxidans at concentrations of 0-4.00 g/L. The pH, ferrous ion oxidation efficiency, total iron precipitation efficiency, and phase of the solid minerals harvested from different treatments were investigated during the ferrous ion oxidation process. In control check (CK) system, pH of the solution decreased from 2.81 to 2.25 when ferrous ions achieved complete oxidation after 72 h of Acidithiobacillus ferrooxidans incubation without the addition of calcium oxide, and total iron precipitation efficiency reached 20.2%. Efficiency of ferrous ion oxidation and total iron precipitation was significantly improved when the amount of calcium oxide added was ≤1.33 g/L, and the minerals harvested from systems were mainly a mixture of jarosite and schwertmannite. For example, the ferrous ion oxidation efficiency reached 100% at 60 h and total iron precipitation efficiency was increased to 32.1% at 72 h when 1.33 g/L of calcium oxide was added. However, ferrous ion oxidation and total iron precipitation for jarosite and schwertmannite formation were inhibited if the amount of calcium oxide added was above 2.67 g/L, and large amounts of calcium sulfate dihydrate were generated in systems.
authors.affiliation: Environmental Engineering Laboratory, College of Resource and Environment, Shanxi Agricultural University, Taigu 030801, China E-mail: lfwlfw2008@163.com; Both authors contributed equally to this work.
authors.forename: Fenwu
authors.initials: F
authors.lastname: Liu
authors.affiliation: College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China; Both authors contributed equally to this work.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Environmental Engineering Laboratory, College of Resource and Environment, Shanxi Agricultural University, Taigu 030801, China E-mail: lfwlfw2008@163.com.
authors.forename: Tongjun
authors.initials: T
authors.lastname: Jin
authors.affiliation: Environmental Engineering Laboratory, College of Resource and Environment, Shanxi Agricultural University, Taigu 030801, China E-mail: lfwlfw2008@163.com.
authors.forename: Shasha
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Environmental Engineering Laboratory, College of Resource and Environment, Shanxi Agricultural University, Taigu 030801, China E-mail: lfwlfw2008@163.com.
authors.forename: Lanlan
authors.initials: L
authors.lastname: Liu
mesh_terms: D042763:Acidithiobacillus / Q000737:chemistry / Q000378:metabolism*; D019149:Bioreactors; D017610:Calcium Compounds / Q000737:chemistry*; D002133:Calcium Sulfate / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000494:pharmacology; D008906:Mining; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D012996:Solutions
chemical_list: D017610:Calcium Compounds; D005296:Ferrous Compounds; D007220:Industrial Waste; D010087:Oxides; D012996:Solutions; C016538:lime; D007501:Iron; C034236:ferrous oxide; D002133:Calcium Sulfate