Remediation of trichloroethylene by bio-precipitated and encapsulated palladium nanoparticles in a fixed bed reactor

Chemosphere. 2009 Aug;76(9):1221-5. doi: 10.1016/j.chemosphere.2009.05.046. Epub 2009 Jun 27.

Abstract

Trichloroethylene is a toxic and recalcitrant groundwater pollutant. Palladium nanoparticles bio-precipitated on Shewanella oneidensis were encapsulated in polyurethane, polyacrylamide, alginate, silica or coated on zeolites. The reactivity of these bio-Pd beads and zeolites was tested in batch experiments and trichloroethylene dechlorination followed first order reaction kinetics. The calculated k-values of the encapsulated catalysts were a factor of six lower compared to non-encapsulated bio-Pd. Bio-Pd, used as a catalyst, was able to dechlorinate 100 mgL(-1) trichloroethylene within a time period of 1h. The main reaction product was ethane; yet small levels of chlorinated intermediates were detected. Subsequently polyurethane cubes empowered with bio-Pd were implemented in a fixed bed reactor for the treatment of water containing trichloroethylene. The influent recycle configuration resulted in a cumulative removal of 98% after 22 h. The same reactor in a flow through configuration achieved removal rates up to 1059 mg trichloroethylene g Pd(-1)d(-1). This work showed that fixed bed reactors with bio-Pd polyurethane cubes can be instrumental for remediation of water contaminated with trichloroethylene.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biodegradation, Environmental
  • Bioreactors*
  • Catalysis
  • Kinetics
  • Metal Nanoparticles / chemistry*
  • Metal Nanoparticles / microbiology
  • Palladium / chemistry*
  • Polymers / chemistry
  • Shewanella / metabolism
  • Trichloroethylene / metabolism*
  • Water Pollutants, Chemical / metabolism*

Substances

  • Polymers
  • Water Pollutants, Chemical
  • Trichloroethylene
  • Palladium