Assessment of the Tolerance to Fe, Cu and Zn of a Sulfidogenic Sludge Generated from Hydrothermal Vents Sediments As a Basis for Its Application on Metals Precipitation

Overview

Journal Mol Biol Rep

Specialty Molecular Biology

Date 2020 Aug 5

PMID 32749633

Authors

Janet Jan-Roblero

Juan C Cancino-Diaz

Jaime Garcia-Mena

Khemlal Nirmalkar

Paola Zarate-Segura

Alberto Ordaz

Claudia Guerrero-Barajas

Affiliations

Soon will be listed here.

Abstract

A paramour factor limiting metal-microorganism interaction is the metal ion concentration, and the metal precipitation efficiency driven by microorganisms is sensitive to metal ion concentration. The aim of the work was to determine the tolerance of the sulfidogenic sludge generated from hydrothermal vent sediments at microcosms level to different concentrations of Fe, Cu and Zn and the effect on the microbial community. In this study the chemical oxygen demand (COD) removal, sulfate-reducing activity (SRA) determination, inhibition effect through the determination of IC, and the characterization of the bacterial community´s diversity were conducted. The IC on SRA was 34 and 81 mg/L for Zn and Cu, respectively. The highest sulfide concentration (HS mg/L) and % of sulfate reduction obtained were: 511.30 ± 0.75 and 35.34 ± 0.51 for 50 mg/L of Fe, 482.48 ± 6.40 and 33.35 ± 0.44 for 10 mg/L of Cu, 442.26 ± 17.1 and 30.57 ± 1.18 for 10 mg/L of Zn, respectively. The COD removal rates were of 71.81 ± 7.6, 53.92 ± 1.07 and 57.68 ± 10.2 mg COD/ L d for Fe (50 mg/L), Cu (40 mg/L) and Zn (20 mg/L), respectively. Proteobacteria, Firmicutes, Chloroflexi and Actinobacteria were common phyla to four microcosms (stabilized sulfidogenic and added with Fe, Cu or Zn). The dsrA genes of Desulfotomaculum acetoxidans, Desulfotomaculum gibsoniae and Desulfovibrio desulfuricans were expressed in the microcosms supporting the SRA results. The consortia could be explored for ex-situ bioremediation purposes in the presence of the metals tested in this work.

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