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Optimizing aerobic biodegradation of dichloromethane using response surface methodology.

Shijin Wu1, Xiang Yu, Zhihang Hu

  • 1College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China. wujan28@zjut.edu.cn

Journal of Environmental Sciences (China)
|December 17, 2009
PubMed
Summary

Optimizing aerobic biodegradation of dichloromethane (DCM) using response surface methodology (RSM) achieved 93.18% efficiency. Key factors include DCM concentration, glucose, and hydrogen peroxide (H2O2) as a terminal electron acceptor.

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Area of Science:

  • Environmental Microbiology
  • Biotechnology
  • Chemical Engineering

Background:

  • Dichloromethane (DCM) is a widely used industrial solvent and a significant environmental pollutant.
  • Developing efficient biodegradation strategies for DCM is crucial for environmental remediation.
  • Pure culture biodegradation offers a controlled system to study microbial degradation kinetics.

Purpose of the Study:

  • To determine the optimal conditions for aerobic biodegradation of dichloromethane (DCM) using response surface methodology (RSM).
  • To investigate the influence of initial DCM concentration, glucose (inducer), and hydrogen peroxide (H2O2, terminal electron acceptor) on biodegradation efficiency.
  • To maximize the DCM biodegradation rate in a pure culture system.

Main Methods:

  • Response Surface Methodology (RSM) was applied to optimize biodegradation parameters.
  • Experiments were conducted using a pure microbial culture capable of degrading DCM.
  • Key variables studied were initial DCM concentration, glucose concentration, and H2O2 concentration.

Main Results:

  • The optimal conditions predicted by RSM for maximum aerobic biodegradation were 380 mg/L DCM, 13.72 mg/L glucose, and 115 mg/L H2O2.
  • Under these optimal conditions, a biodegradation efficiency of 93.18% was achieved.
  • Degradation efficiency decreased significantly at higher DCM concentrations (>480 mg/L) and was limited without glucose addition.

Conclusions:

  • RSM is an effective tool for optimizing the aerobic biodegradation of DCM.
  • Glucose acts as a crucial inducer for DCM biodegradation, enhancing efficiency significantly.
  • H2O2 concentration needs careful optimization; high DCM concentrations can limit the effectiveness of H2O2 as a terminal electron acceptor.