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Pentachlorophenol dechlorination by an acidogenic sludge.

Cheok Hong Mun1, Jianzhong He, Wun Jern Ng

  • 1Division of Environmental Science & Engineering, National University of Singapore, Singapore 117576. g0304861@nus.edu.sg

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|August 12, 2008
PubMed
Summary
This summary is machine-generated.

This study shows acidogenic biotreatment effectively removes pentachlorophenol (PCP). The process uses reductive dechlorination and adsorption, with adsorption dominating at higher PCP loads, preparing wastewater for further treatment.

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Area of Science:

  • Environmental microbiology
  • Bioremediation
  • Wastewater treatment

Background:

  • Pentachlorophenol (PCP) is a persistent organic pollutant requiring effective removal strategies.
  • Acidogenic processes offer a potential method for PCP degradation in contaminated environments.

Purpose of the Study:

  • To investigate the feasibility of removing pentachlorophenol (PCP) using an acidogenic process in batch reactors.
  • To understand the mechanisms and efficiency of PCP removal under varying conditions.

Main Methods:

  • Acclimation of acidogenic sludge with 2,4,6-trichlorophenol (2,4,6-TCP).
  • Batch reactor experiments to assess PCP removal at different loads (0.48 and 9.3 micromoles/gMLVSS.d).
  • Analysis of PCP removal mechanisms, including reductive dechlorination and adsorption.

Main Results:

  • PCP was ortho-dechlorinated to 3,4,5-trichlorophenol (3,4,5-TCP) via an intermediate, but preferential adsorption to sludge and subsequent dechlorination to 2,4,6-TCP inhibited further 2,4,6-TCP dechlorination.
  • PCP removal was attributed to both reductive dechlorination and adsorption.
  • At low PCP loads, dechlorination was dominant (69%); at high loads, adsorption was dominant (82%).
  • Attempts to induce meta or para dechlorination failed.

Conclusions:

  • Acidogenic biotreatment is an effective process for reducing PCP loads.
  • The removal mechanism shifts from dechlorination to adsorption with increasing PCP concentration.
  • This process can be used as a pre-treatment step before downstream biological treatment.