Filtration membranes in two wastewater treatment tanks at an Iowa ethanol producer were susceptible to damage from freezing temperatures. Each filtration membrane is valued at $1 million; any membrane damage due to freezing could result in the need to replace the entire membrane and the loss of production. The tanks 11 deep, 8 wide and 15 long are part of a closed loop system that holds thousands of gallons of water used in ethanol production. The process is critical to production, and the water must be treated before reuse or release. A loop system was considered to keep water flowing, but the addition of such a system would have added energy and piping costs.
A modified Chromalox TLI L-shaped metal heater was installed in each tank, mounted on a 156 riser and 4 sludge legs. Each 480V heater unit holds two tiers of three elements and is controlled by a Chromalox 4468 Contactor Panel. The systems maintain the water in each tank between 40° and 50° F. The company also purchased a third heater/contactor system to keep on hand as a backup unit.
- Ensuring stability of critical and expensive filtration membrane components
- Turn-key system assures facility remains online and maintains production
- Energy savings over alternative solution