Microbial Styrene Degradation by Dirk Tischler download in ePub, pdf, iPad
Microbial processes play a major role in the removal of recalcitrant compounds taking advantage of the astonishing catabolic versatility of microorganisms to degrade or transform such compounds. The reference value and tested range are consistent with the data. The uncertainty in resin degradation rates was addressed in the post closure safety assessment through variant cases in which the gas generation rates and related parameters are varied. In this case styrene degraded to a range of organic intermediates and carbon dioxide.
Bacterial genera Azoarcus and Pseudomonas were among the dominant classified genera in the biofilter. Microbial communities in biofilters make up complex and structured ecosystems that can adapt and change in accordance with variable physicochemical operational conditions. This is an order of magnitude faster than the most rapid rate of polystyrene degradation identified Kaplan et al. Below is some excerpts from their findings around Polystyrene, with a link to the position paper.
The elimination of styrene waste vapor through biofiltration provides a cost-effective and environmentally friendly alternative to conventional disposal methods Devinny et al. Bioremediation and biotransformation processes harness the naturally occurring ability of microbes to degrade, transform or accumulate a wide range of organic pollutants. However, a complete detailed analysis of complex microbial populations present in styrene-degrading waste gas biofilters has yet to be conducted. In particular, a special case is presented in this report with the resin degradation rate set to the maximum value estimated from the data. Changes in microbial structure were observed between different stages of biofilter operation, and the level of styrene concentration was revealed to be a critical factor affecting these changes.
Many previous studies have attempted to assess this relationship by inferring microbial diversity in bioreactors detected through molecular methods such as cloning Friedrich et al. Most of the previous studies examining the degradation of styrene gas through biofiltration have focused on using either one or a few styrene-degrading bacterial Okamoto et al. Thus, bioreactors start with unique microbial ecosystems that have the potential to respond differently to operational conditions, depending on the structure of the populations.
Known limitations and biases of each of these molecular techniques Talbot et al. Leachate was collected at the bottom of the biofilter through a separate outlet line. As molecular tools become increasingly applied to study microbial populations in bioreactors, a demand in accuracy and reproducibility of these tools becomes apparent. These calculations indicate that the repository pressure tends to equilibrate at generally similar pressures, independent of the specific gas generation rate assumptions. Comparison of results revealed discrepancies between the two methods in the detected percentages of numerous taxonomic groups.
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