Affordable Access

Publisher Website

Bioinhibitory effect of hydrogenotrophic bacteria on nitrate reduction by nanoscale zero-valent iron

Authors
Journal
Chemosphere
0045-6535
Publisher
Elsevier
Volume
103
Identifiers
DOI: 10.1016/j.chemosphere.2013.11.036
Keywords
  • Hydrogenotrophic Bacteria
  • Nanoscale Zero-Valent Iron
  • Nitrate Removal
  • Bioinhibitory Effect
  • Iron Corrosion
Disciplines
  • Chemistry

Abstract

Abstract Hydrogenotrophic bacteria (HTB) were introduced into a nitrate removal system, which used nanoscale zero-valent iron (nZVI) as reductant, to investigate its bioinhibitory effect. Based on the results, it was noted that addition of HTB culture (10–50mL) led to 58.9–91.4% decrease in the first observed rate constant (kobs1), which represented the nitrate removal rate by nZVI, and a reduction in the generated poisonous by-products from 94.9% to 38.5%. In other words, HTB had a significant inhibitory effect on nitrate reduction by nZVI. However, the pathway of this bioinhibition only prevented the occurrence of chemical reduction, but not competition for nitrate. Furthermore, FeOOH coating was observed on the surface of nZVI, instead of Fe3O4 or Fe2O3, which could prevent electron transmission from nZVI to nitrate. Considering that FeOOH was the product of iron corrosion, the result indicated that HTB could inhibit chemical reduction by enhancing the reaction between nZVI and water.

There are no comments yet on this publication. Be the first to share your thoughts.