Co-contaminant effects on 1,4-dioxane biodegradation in packed soil column flow-through systems

Linduo Zhao, Xia Lu, Alexandra Polasko, Nicholas W. Johnson, Yu Miao, Ziming Yang, Shaily Mahendra, Baohua Gu

Research output: Contribution to journalArticle

Abstract

Biodegradation of 1,4-dioxane was examined in packed quartz and soil column flow-through systems. The inhibitory effects of co-contaminants, specifically trichloroethene (TCE), 1,1-dichloroethene (1,1-DCE), and copper (Cu2+) ions, were investigated in the columns either with or without bioaugmentation with a 1,4-dioxane degrading bacterium Pseudonocardia dioxanivorans CB1190. Results indicate that CB1190 cells readily grew and colonized in the columns, leading to significant degradation of 1,4-dioxane under oxic conditions. Degradation of 1,4-dioxane was also observed in the native soil (without bioaugmentation), which had been previously subjected to enhanced reductive dechlorination treatment for co-contaminants TCE and 1,1-DCE. Bioaugmentation of the soil with CB1190 resulted in nearly complete degradation at influent concentrations of 3–10 mg L−1 1,4-dioxane and a residence reaction time of 40–80 h, but the presence of co-contaminants, 1,1-DCE and Cu2+ ions (up to 10 mg L−1), partially inhibited 1,4-dioxane degradation in the untreated and bioaugmented soil columns. However, the inhibitory effects were much less severe in the column flow-through systems than those previously observed in planktonic cultures, which showed near complete inhibition at the same co-contaminant concentrations. These observations demonstrate a low susceptibility of soil microbes to the toxicity of 1,1-DCE and Cu2+ in packed soil flow-through systems, and thus have important implications for predicting biodegradation potential and developing sustainable, cost-effective technologies for in situ remediation of 1,4-dioxane contaminated soils and groundwater.

Original languageEnglish (US)
Pages (from-to)573-581
Number of pages9
JournalEnvironmental Pollution
Volume243
DOIs
StatePublished - Dec 2018
Externally publishedYes

Keywords

  • Biotransformation
  • Chlorinated solvent
  • Cyclic ether
  • Heavy metal
  • Inhibition

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

Fingerprint Dive into the research topics of 'Co-contaminant effects on 1,4-dioxane biodegradation in packed soil column flow-through systems'. Together they form a unique fingerprint.

  • Cite this