An ethanol production plant in Nebraska selected a skid-mounted regenerative thermal oxidizer from Anguil Environmental Systems to help it stay in EPA compliance following an expansion. Anguil provides the prepackaged oxidizer as an assembled and factory tested unit to minimize installation and startup time.


A multi-million dollar contract was awarded to Anguil Environmental Systems Inc., a Milwaukee-based air-pollution control supplier, to assist a Nebraska ethanol production plant in meeting EPA regulatory requirements.

At the Nebraska ethanol plant, a 42-million-gallon expansion was certain to put the dry mill out of emission compliance for hazardous air pollutants (HAPs), volatile organic compounds (VOCs), carbon monoxide (CO), nitrogen oxides (NOX), and particulate matter, all regulated by the EPA. Ethanol production facilities in the United States are permitted to operate under a “minor source” status as long as the total tonnage of key pollutants is below the 100 tons per year limit. However, operating restrictions, penalties and fines, and community pressures are forcing many plants to strive for the lowest possible emission levels, enabling future capacity expansions.

Anguil was chosen as the Nebraska ethanol plant’s emission-control-equipment provider after demonstrating its ability to provide a reliable, cost-effective solution that would provide high destruction efficiencies. The Nebraska plant selected Anguil’s regenerative thermal oxidizer as the best available control technology for the application based on the company’s reputation for low operating costs and high destruction rate efficiency.

At the facility, the pollution control device will consist of two side-by-side Anguil regenerative thermal oxidizers handling a process volumetric flow of 120,000 scfm. The system will achieve greater than 99 percent destruction rate efficiency for air pollutants and odorous emissions, with 95 percent thermal energy recovery, helping ensure low fuel usage. Portions of the equipment will be constructed of 304 stainless steel to protect against corrosion from the ethanol process stream. The project scope consists of equipment design, manufacturing, installation supervision, process integration and startup. Production on the oxidizer system has begun, and the project is expected online in April.

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