Enhanced nitrobenzene removal and column longevity by coupled abiotic and biotic processes in zero-valent iron column

Weizhao Yin, Jinhua Wu, Weilin Huang, Chaohai Wei

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

In this study, abiotic zero-valent iron (ZVI) column and biotic ZVI column were employed to investigate abiotic and biotic effects between iron and microorganisms on NB removal and column longevity. Physical removal and kinetics analysis revealed that NB was largely removed through adsorption and/or co-precipitation and the reduction of NB to aniline (AN) via abiotic reaction in the abiotic column and via both abiotic and biotic reactions in the biotic column. Due to the interactive effect of ZVI and microorganisms, more effective iron consumption and more reactive minerals such as green rust and iron sulfide were found in the biotic column. This led to approximately 50% higher total NB removal and 6 times higher AN production in the biotic column as compared to the abiotic column during the entire operation. According to the NB breakthrough curves, longer stability and longer life-span of the column system could be maintained in regard of microbial activity. It indicated that additional microorganisms might improve the performance of iron-based permeable reactive barrier (PRB) for groundwater remediation.

Original languageEnglish (US)
Pages (from-to)417-423
Number of pages7
JournalChemical engineering journal
Volume259
DOIs
Publication statusPublished - Jan 1 2015

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Keywords

  • Microorganism
  • Nitrobenzene
  • Reduction
  • Zero-valent iron

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