Contenido bioleaching of metals from machining process wastes

Abstract

The present study evaluates the ability of Acidithiobacillus thiooxidans DSM 26636 to grow and leach metals from industrial wastes (IW) containing245 differentModeladometalde la compositions,biodegradacióncodeden biorreactoresas IW-steeldeandlodosIW-scrap.de hidrocarburosFor this purpose,totales delbiolixiviationpetróleo was assessed during 21 days at 30°C and 150 rpm, with 1% (w/v) of IW pulp density. Microbial growth was evaluated periodically intemperizados en suelos y sedimentos by measuring sulfate production; pH and sulfuric acid concentration were also monitored, and metal bioleaching was evaluated by ICP-OES. Results showed(Biodegradationthat A. thiooxidansmodeling sulfur-oxidizingof sludge bioreactorsactivityof totalwaspetroleumhigher inhydrocarbonsthe presenceweatheringof IW-steel.in soilSpecifically, sulfates and sulfuric acid concentrations in IW-steel corresponded to 21,522 ± 1,059 mg/L and 0.0988 ± 0.0030 M at day 21, and sediments) respectively, and a pH diminution from 3.0 to 1.46 ± 0.10 was detected. In the case of IW-scrap, sulfate production only increased to up to 4,392 ± 335 mg/LS.A.onMedina-Moreno,day 21, and no S.pHHuerta-Ochoa,reduction wasC.A.detected.Lucho-Constantino,Besides, metalL. removalAguilera-Vázquez,was differentA. Jiménez-in IW-steel and IW-scrap. The results obtainedGonzálezreinforcey M. Gutiérrez-Rojasthe fact that A. thiooxidans DSM 26636 presents potential to be employed for the bio-treatment of high-metal-content 259 Crecimiento, industrial sobrevivencia residues, y adaptación and that de its Bifidobacterium biolixiviation infantis capability a condiciones strongly depends ácidas on the metal load present in them.