F. PROCESS
1. The treatment process is a batch-type Intermittent Cycle Extended Aeration System with the aeration chamber designed for a minimum 14 hour detention time. Aeration chamber capacity will allow up to 33% of total daily flow as surge capacity from standby level. Incoming waste is directed to a disintegrator basket immersed in mixed liquor, except in cases where an externally located buffer tank is used.
2. Aeration and mixing of sewage in the aeration chamber are accomplished by blowers with diffusers located throughout the tank
3. When mixed liquor rises in the aeration vessel to a predetermined level, a batch of mixed liquor of measured volume is transferred to the clarifier, with overflow providing skimming of floatables prior to a period of completely quiescent settling.
4. At completion of a 60-minute settling period, a batch of supernatant liquor is transferred to the ozone contact chamber and held for a minimum of one hour. The supernatant transfer is accomplished with no disturbance to settled sludge or floating scum. On completion of supernatant transfer, the retained volume of the clarifier is returned to the aeration chamber for further treatment.
5. After 60 minutes' in the ozone contact chamber (45 minutes for ozonation and 15 minutes for settling), 95% of the volume is transferred to discharge facilities directly, or to a filter (optional) and UV disinfectant (optional) for disposal as per EPA permit. The balance of 5% is returned to the aeration chamber for further processing.
6. Level signals are provided by float-type, mercury-tip switches. Where possible, switches will interrupt only low-amperage circuits. These circuits operate at not more than 125 vac.
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