Tag Archives: Blending

U.S. EPA to change rule-making process for wastewater blending

The U.S. Environmental Protection Agency (EPA) announced in April that it will work with states, municipalities, and subject-matter experts to set public health and safety standards for wastewater blending. The Water Environment Federation (WEF; Alexandria, Va.) will provide EPA with guidance and comments during the rule-making process. Wastewater blending is a procedure that water resource […]

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EPA Hosts Experts Public Health Forum on Blending

On June 19 and 20, the U.S. Environmental Protection Agency hosted an expert’s public health forum to discuss the implications of “blended” effluent discharges from publicly owned treatment works (POTWs). Blending occurs when wet weather flows exceed the plant’s treatment capacity and excess flow must bypass the biological treatment process. This flow is recombined with […]

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Federal Appeals Court Rules on Blending and Mixing at Water Resource Recovery Facilities

On March 25, the U.S. Court of Appeals for the 8th Circuit ruled that the method of regulating blending and mixing at water resource recovery facilities specified in U.S. Environmental Protection Agency (EPA) letters is procedurally invalid. The 2011 letters to Sen. Charles Grassley outlined EPA’s positions on mixing zones and blending. In the case, […]

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