Co-contaminated soils bioremediation by actinobacteria

APARICIO, JUAN DANIEL; SIMÓN SOLÁ, MARÍA ZOLEICA; ATJIÁN, MARIANA CRISTINA; BENIMELI, CLAUDIA SUSANA; AMOROSO, MARÍA JULIA DEL ROSARIO

Bioremediation in Latin America. Current Research and Perspectives.

Springer

Año: 2015; p. 179 - 192

More than one-third of contaminated areas are found to have more thanone type of pollutant. Co-contaminated environments with metals and organiccompounds are diffi cult to remediate because of the mixed nature of the pollulants.Actinobacteria is an important group of microorganisms found in soils, with highmetabolic versatility and abilities to bioremediation. Actinobacteria are currentlystudied for bioremediation of soils contaminated by pesticides and heavy metals.In this chapter we review the potential of actinobacteria isolated from contaminatedenvironments for simultaneous soil bioremediation of Cr(VI) and the organochlorinepesticide lindane. Four actinobacteria, tolerant to Cr(VI) and lindane mixturewere used: Streptomyces spp. A5, M7, MC1 and Amycolatopsis tucumanensis DSM45259. Sterilized soil samples were inoculated with actinobacteria strains, eitherindividually or as a consortium (formed by all selected actinobacteria) then contaminatedwith Cr(VI) and lindane, and incubated at 30 °C for 14 days. All actinobacteriawere able to grow and remove both contaminants, the consortium formed byStreptomyces spp. A5, M7, MC1 and A. tucumanensis showed the highest Cr(VI)removal, while Streptomyces sp. M7 produced the maximum lindane removal. Innon-sterile soil samples, Streptomyces sp. M7 and the consortium removed morethan 40 % of the lindane, while Streptomyces sp. M7 demonstrated the greatestCr(VI) removal. According to these results, it could be concluded that the use ofStreptomyces sp. M7 is the strategy more appropriate for the bioremediation of soilscontaminated with Cr(VI) and lindane.