QPS LLC

The biowaste from the facility flows into the BioWaste System through a 3" underground piping system. Waste water flows into a 22" wide by 24" high by 76" long stainless steel tank. The tank is bolted to the drain pipe at the ANSI flange at the drain outlet. The tank is incorporated with a removable screened section to capture large materials that may end up in the waste system (such as wipes and pipettes). Water passes the screened section and when detected by a level monitoring device, activate one of two diaphragm transfer pumps. These pumps transfer waste water from the sump through the process piping to one of the two processing tanks. Control of the system is accomplished through an Allen Bradley control system according to the process sequences. The control system is located on the mezzanine adjacent to the process tanks. Two operator interface terminals provide system information.

PROCESS SEQUENCES

Tank Standby Mode:

• Tank is empty and can receive biowaste.

Tank Filling Mode:

• Tank is receiving biowaste. Tank vent is open.

Tank Heating Mode:

· Preheat water to pre-heat temperature setpoint when water level reaches preheat level setpoint. Heat to final water temperature setpoint. Close vent valve and open condensate trap valve. Steam is introduced through injector. The dynamics of the system create mixing in the tank and through the bypass line on the tank. Begin to accumulate Fo and maintain temperature between upper and lower sterilization setpoints using PID control. Remain in mode until Fo accumulation setpoint is reached.

Tank Draining:

· Drain tank to the low level setpoint and begin drain line and heat exchanger temperature control. If tank pressure is above pressure setpoint, open non-potable water control valve. Keep valve open until the city water close level setpoint is reached. If tank pressure is below pressure setpoint but not at the low low tank level, open air control valve. Keep valve open until the low low level setpoint is reached. Tank stops draining when pressure drops below low pressure setpoint and the tank level reaches the low low level setpoint.