Removal of chlorine from treated effluent is a fundamental prerequisite of the wastewater treatment process, mandated by the U.S. EPA and Texas Commission on Environmental Quality. Sulfur dioxide is one of several means available to meet this requirement. The gas is injected into the water by a sulfonator combined with an injector or inductor, which creates a vacuum that pulls the chemical into the treated water to eliminate the chlorine residual.In the mid-1990s, the River Road Wastewater Treatment Facility in Wichita Falls, Texas, experienced several incidents in which chlorinated water was released into its receiving stream, the Big Wichita River,
