Biological Waste Inactivation System

The waste system is capable of treating biological waste transferred from a waste hold tank. The waste is heat inactivated by direct mixing of steam by a steam injector. After the waste is heated, it enters a retention/hold tube to satisfy the time/temperature requirements for heat inactivation. The waste initially circulates back to the waste hold tank until the temperature is satisfied at the end of the retention tube, at which point it is sent to a waste neutralization tank.

The waste system retention/hold tube was designed and constructed for a 25 second hold, based on a 150 GPM flow rate. All equipment within the system was designed for a peak flow rate of 150 GPM, but will normally operate at 100 GPM.

The system is operated in a continuous phase and not controlled by a recipe. The continuous phase thermally inactivates any active cells that may be present in the waste. The waste is then transferred to a neutralization tank where it is pH adjusted. The continuous cycle is initiated by a level setpoint being reached in the waste hold tank. Waste that does not meet the time/temperature requirements automatically circulates back to the waste hold tank.

Controls:
The owner supplied DCS system performed all automatic sequencing, alarm indication and control functions. IPEC provided two control panels, mounted on the system. One panel was a NEMA 4X termination panel to which all items on the system were wired. The second panel was an MCC panel that contains all motor control equipment to operate the system mounted motors.

Testing:
Prior to shipment, the system was IQ and OQ checked to ensure satisfactory operation of all system mounted components. This was followed by a customer witnessed Factory Acceptance Dry Testing (FADT) and Factory Acceptance Wet Testing (FAWT).