Activated Sludge: Polybac Corp.; Detox Inc.; Ground Decontaminaton Systems
Rotating Biological Contactors: Polybac Corp.; Detox Inc.; Ground Decontaminaton Systems
Biological degradation of hazardous organic substances is a viable approach to waste management. Common processes are those originally utilized in treating municipal wastewaters, based on aerobic or anaerobic bacteria. In-situ treatment of contaminated soils can be performed biologically. Cultures used in biological degradation processes can be native (indigenous) microbes, selectively adapted microbes, or genetically altered microorganisms.
Table 11.17.1 shows that every class of anthropogenic compound can be degraded by some microorganism. Anthropogenic compounds such as halogenated organics are relatively resistant to biodegradation. One reason for this is the naturally present organisms often cannot produce the enzymes necessary to transform the original compound to a point where resultant intermediates can enter common metabolic pathways and be completely mineralized.
Several of the most persistent chlorinated compounds, such as TCE, appear to be biodegradable only through co-metabolism. Co-metabolism involves using another substance as a source of carbon and energy to sustain micro-bial growth. The contaminant is metabolized gratuitously due to a lack of enzyme specificity. To stimulate co-metabolism in bioremediation, a co-substrate is added to the
Was this article helpful?