title: Analysis of metal Bioleaching from thermal power plant fly ash by Aspergillus niger 34770 culture supernatant and reduction of phytotoxicity during the process.
abstract: Aspergillus niger culture supernatant is used for bioleaching process. Before starting bioleaching process, fly ash was washed with distilled water. This removed 100 % sodium, 47 % (±0.45) boron, 38.07 % (±0.12) calcium, 29.89 % (±0.78) magnesium, and 11.8 % (±0.05) potassium. The pH was reduced from 10.5 to 8.5 after water washing. During bioleaching process, around 100 % metal removal was achieved in 4 h for all metals except chromium 93 % (±1.18), nickel 83 % (±0.32), arsenic 78 % (±0.52), and lead 70 % (±0.20). The process parameters including temperature, shaking speed, and solid/liquid ratio were optimized for bioleaching process. Experiments were conducted to evaluate effect of fly ash on growth of mung bean (Vigna radiata). At 20 g/100 ml fly ash concentration no germination of V. radiata seeds was observed. With an increasing concentration of untreated fly ash, a gradual decrease in root/shoot length was observed. After bioleaching process 78 % (±0.19) germination of V. radiata was observed with 20 g/100 ml fly ash. This study will help to develop an efficient process to remove the toxic metals from fly ash.
authors.affiliation: Department of Power Mechanical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang Fu Rd., 30013, Hsinchu, Taiwan, Republic of China.
authors.forename: Umesh U
authors.initials: UU
authors.lastname: Jadhav
authors.forename: Hong
authors.initials: H
authors.lastname: Hocheng
mesh_terms: D001234:Aspergillus niger / Q000254:growth & development* / Q000378:metabolism*; D001673:Biodegradation, Environmental; D060729:Coal Ash / Q000737:chemistry*; D017077:Culture Media, Conditioned / Q000378:metabolism*; D007887:Fabaceae / Q000187:drug effects / Q000254:growth & development; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000302:isolation & purification* / Q000378:metabolism* / Q000633:toxicity; D011210:Power Plants; D014867:Water / Q000737:chemistry
chemical_list: D060729:Coal Ash; D017077:Culture Media, Conditioned; D008670:Metals; D014867:Water