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The purpose of this course is to provide a level of information as to whether an organism is a potential ThermaPureHeat® target. The table information is not intended to provide absolute values, but rather ranges to use to set temperature and duration guidelines for specific targets. In the case of E. coli, for example, there is a consensus that 60ºC/140ºF is adequate to kill or inactivate the bacteria, but the durations range from 20 to 105 minutes at this temperature. To apply this information in a heat specification, it would be prudent to exceed both temperature and time determined from laboratory testing and to require a minimum of 66ºC/150ºF and duration of 3 hours to compensate for field conditions and requirements.

The course comprises a number of microorganisms, many of which are considered pathogens. These include bacteria, fungi, protozoa, helminthes and viruses. Most listed are human pathogens, but some are animal, avian or plant, or some combination. There are also pests and insects included in the course. The course provides the organism name and additional information including the references this information was originally cited. The resources include studies for food pasteurization, sewage sludge treatment, pest control, soil pasteurization, and compost and timber sterilization. In many of these studies a thermal death point or thermal death time of the pathogen was cited or evaluated. Oftentimes these results will vary from other sources because the medium in which the organism was cultured or treated varies or other conditions may vary. For example, E. coli will probably respond to temperature differently in a food product, such as milk, than in sewage sludge. Additionally, most of these results came from laboratory testing and therefore were not affected by field conditions such as the amount of biomass, RH, pH, etc.

Course Curriculum

Thermal Death Point 00:00:00
Thermal Death Point Power Point 00:00:00

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