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Biodegradation of chlorinated phenolic compounds
A P Annachhatre1, S H Gheewala
1Environmental Engineering Program, Asian Institute of Technology, GPO Box 2754, Bangkok 10501, Thailand.
Biotechnology Advances
|January 1, 1996
Summary
Chlorophenolic compounds, toxic industrial pollutants, degrade slowly in nature. Engineered systems with acclimatized biomass enhance biodegradation, with combined aerobic and anaerobic processes offering improved removal rates.
Area of Science:
- Environmental Science
- Microbiology
- Chemical Engineering
Background:
- Chlorophenolic compounds are toxic, persistent industrial byproducts requiring environmental regulation.
- Natural biodegradation of chlorophenols is slow and incomplete, influenced by chlorine substitution patterns.
- Aerobic degradation yields catechols; anaerobic degradation involves reductive dehalogenation.
Purpose of the Study:
- To review the biodegradation pathways and influencing factors of chlorophenolic compounds.
- To assess the effectiveness of engineered systems for chlorophenol removal.
- To identify strategies for enhancing chlorophenol biodegradation.
Main Methods:
- Review of existing literature on chlorophenol biodegradation.
- Analysis of aerobic and anaerobic metabolic pathways.
- Evaluation of biomass acclimatization and combined process strategies.
Main Results:
- Biodegradation rates and extent depend on the number and position of chlorine atoms.
- Biomass acclimatization significantly reduces lag phase and overcomes inhibition.
- Partial removal (40-60%) is typical in single aerobic or anaerobic systems.
Conclusions:
- Combined aerobic and anaerobic treatment significantly enhances chlorophenol removal efficiency.
- Understanding biodegradation pathways is crucial for designing effective remediation strategies.
- Biomass acclimatization is a key factor in optimizing engineered bioremediation systems.