A rubber curing company needed a solution to treat blue haze and low-level volatile organic compounds (VOCs) to meet regulatory requirements. The large electrostatic precipitator in use was too expensive to maintain. The company sought effective opacity control that could also reduce operating costs.

The rubber curing plant first inquired about a thermal oxidizer. However, the fuel costs of a thermal system nearly equaled the maintenance cost of the precipitator. After a technical evaluation, the plant selected Milwaukee-based Anguil Environmental Systems Inc. to solve their VOC emission problem and put them in compliance. Because of its fuel efficiency and lower operating costs, a regenerative thermal oxidizer was a possible option. However, Anguil found that the footprint and the weight of the unit could not provide the flexibility the customer desired. Anguil's engineers recommended its self-cleaning ceramic filter to eliminate the blue haze and the VOCs.

Anguil worked with the rubber curing company's process engineers to design a system that reduced duct maintenance cost and provided effective opacity and VOC control. The small footprint of the Anguil self-cleaning ceramic filter allowed the company to roof-mount the units and treat 1,500 cfm oven “zones” with direct duct runs. By making shorter and more direct duct runs, Anguil engineers reduced the risk and cost of particulate buildup.

Other benefits of the self-cleaning ceramic filter include a 40 percent effective shell-and-tube heat exchanger, providing cost savings through heat recovery. Anguil's flexible design also provides options for future adjustments in pollution control. The plant was located in an area that may come under more stringent environmental regulations, and Anguil's self-cleaning ceramic filter can be equipped with catalyst to achieve 95 percent VOC destruction.