Porter_Enviro_Micro_lecture

Porter_Enviro_Micro_lecture - Biodegradation of trace...

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Biodegradation of trace contaminants – pharmaceuticals and personal care products Dr. Abbie Porter May 3, 2010
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Outline Discuss abundance of these compounds in the environment Overview of bacterial degradation Specific pathways and how they relate to model aromatic degradation pathways Predicting biodegradability
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What are PPCPs? PPCPs are P harmaceutical and P ersonal C are P roducts. Personal care products include products used for personal hygiene Classified by use, not structure Antimicrobials, fragrances, surfactants
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Entry into the environment PCPs enter wastewater treatment plants (WWTP) as components of gray water. Pharmaceuticals are also components of the waste stream, but may have been modified via conjugation after being ingested. While there is removal of these compounds during the wastewater treatment process, it may not be complete, which results in environmental release with the treated water Constant use = continued release
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PPCP environmental abundance Top 5 contaminants included: DEET (N, N- diethyltoluamide) Caffeine Triclosan 4-nonylphenol Concentrations ranged parts per trillion to parts per billion Kolpin et al. 2002
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Factors related to PPCP environmental influx Removal in the WWTP Abiotic – photolysis/photodegradation Biotic – microbial (bacterial and fungal) degradation Sorption to biosolids
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Factors related to PPCP environmental influx WWTP parameters that might have an effect on biodegradation 1. Temperature 2. Hydraulic retention time 3. Solids retention time Some microbes have a slower growth rate May require a period of adaptation before degradation Gene induction More easily utilized substrates must be removed first
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Environmental parameters that might have an effect on biodegradation 1. Temperature 2. O 2 availability 3. Availability of alternate electron acceptors 4. Acclimation of indigenous microbial population Factors related to PPCP environmental presence
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Porter_Enviro_Micro_lecture - Biodegradation of trace...

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