Thermal EDS Systems

 
 
 

Typically, a Thermal EDS process involves:

  • Filling - Waste effluent is either pumped or gravity flows into the receiving tank via the inlet waste lines. As the tank fills with effluent, the dirty air is vented out via a double bank of HEPA filters. When the effluent reaches the high level sensor a sterilization cycle is automatically initiated. The inlet will close diverting any further waste effluent to one of the remaining two tanks in the system (commencement of a sterilization cycle in one tank automatically sets the next tank in sequence to Receiving Mode). When the inlet trash valve is fully closed, the valve on the power flush water line will open for approximately 20 seconds.

  • Heating - To ensure a uniform temperature rise across the system, the recirculation pump will start, providing agitation to the vessel contents. This not only ensures that no "cold spots" are present, but also prevents solids build up on the bottom surface of the vessel. Furthermore, as the liquid from the recirculation loop re-enters the vessels it passes through a static jet pump, which applies a venturi effect to further amplify agitation. The steam valve will open allowing flow of steam through the vessel jacket or heating coils, which will heat the vessel contents. The vessel will continue to heat and recirculate until a temperature of 270˚F (132°C) is reached, at which point the system will proceed into Sterilizing Mode.

  • Sterilizing - During this phase the vessel contents will be held at (or slightly above) 270˚F (132°C) for a period of one hour. These parameters are specifically selected to guarantee complete sterilization of the entire vessel contents in all circumstances. Throughout the sterilization phase, the recirculation pump continues to provide agitation to the system for uniform mixing.

  • Cooling - EDS typically cool in one of two ways depending on each individual facility and its corresponding waste effluent stream. Where there is not a relatively large amount of particulate solids, the effluent can be passed through a shell and tube heat exchanger. In other circumstances the sterile effluent is cooled by passing cold water through the vessel jacket or heating coils.

  • Draining - When the sterile effluent has cooled to the desired temperature, it is then pumped to the drain. When the EDS vessel is empty it automatically shuts down and the vessel will go into Stand by Mode. It will remain in Stand by Mode until the other processing vessels in the system have completed a cycle, at which point the valves will again open and the tank will proceed back into Receiving Mode. Waste effluent is either pumped or gravity flows into the receiving tank via the inlet waste lines. As the tank fills with effluent, the dirty air is vented out via a double bank of HEPA filters.

    When the effluent reaches the high level sensor a sterilization cycle is automatically initiated. The inlet will close diverting any further waste effluent to one of the remaining two tanks in the system (commencement of a sterilization cycle in one tank automatically sets the next tank in sequence to Receiving Mode). When the inlet trash valve is fully closed, the valve on the power flush water line will open for approximately 20 seconds. To ensure a uniform temperature rise across the system, the recirculation pump will start, providing agitation to the vessel contents. This not only ensures that no "cold spots" are present, but also prevents solids build up on the bottom surface of the vessel. Furthermore, as the liquid from the recirculation loop re-enters the vessels it passes through a static jet pump, which applies a venturi effect to further amplify agitation. The steam valve will open allowing flow of steam through the vessel jacket or heating coils, which will heat the vessel contents. The vessel will continue to heat and recirculate until a temperature of 270˚F (132°C) is reached, at which point the system will proceed into Sterilizing Mode. During this phase the vessel contents will be held at (or slightly above) 270˚F (132°C) for a period of one hour. These parameters are specifically selected by to guarantee complete sterilization of the entire vessel contents in all circumstances.

    Throughout the sterilization phase, the recirculation pump continues to provide agitation to the system for uniform mixing. EDS typically cool in one of two ways depending on each individual facility and its corresponding waste effluent stream. Where there is not a relatively large amount of particulate solids, the effluent can be passed through a shell and tube heat exchanger. In other circumstances the sterile effluent is cooled by passing cold water through the vessel jacket or heating coils. When the sterile effluent has cooled to the desired temperature, it is then pumped to the drain. When the vessel is empty it automatically shuts down and the vessel will go into Stand by Mode. It will remain in Stand by Mode until the other processing vessels in the system have completed a cycle, at which point the valves will again open and the tank will proceed back into Receiving Mode.
     
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