Liquid-Phase Bioreactor for Degradation of Trichloroethylene and Benzene
Final rept. 1 Jun-30 Nov 1991
ENVIROGEN INC LAWRENCEVILLE NJ
Pagination or Media Count:
The objective of this project was to design and operate a bench-scale biological treatment system capable of degrading trichlorethylene TCE and benzene, each present at concentrations up to 50 ppm, to concentrations of 4 ppb or less per contaminant. A two-stage reactor system was designed and fabricated to allow for the sequential degradation of benzene followed by TCE since TCE demonstrated no inhibitory effects on benzene degradation. A first-stage fixed- film reactor system demonstrated greater than 96 biodegradation of benzene from an artificially contaminated groundwater stream over a two month period of continuous operation. The liquid exiting the first-stage reactor was stripped to transfer the TCE and residual benzene into the air phase which was treated into a vapor phase bioreactor. The second-stage unit biodegraded greater than 90 of the TCE and greater than 90 of the residual benzene load. The two stage treatment system demonstrated the feasibility of biological treatment for a mixture of nonchlorinated and chlorinated organic contaminants in groundwater. Biodegradation, Bioreactor, Groundwater, Remediation, Trichloroethylene, Benzene.
- Organic Chemistry
- Biomedical Instrumentation and Bioengineering