How are biosolids produced and regulated?
Municipal wastewater enters the wastewater treatment facilities as mostly water, containing about 0.5% solid matter. During the treatment process at the Avon and Edwards Wastewater Treatment Plants, much of the water is removed, and the solids undergo a state-of-the-art biosolids digestion process called Autothermal Thermophilic Aerobic Digestion. This process produces Class A Biosolids – a product that meets, but typically exceeds, all Class A pathogen and metals biosolids criteria set forth in the USEPA 40CFR Part 503 and State of Colorado regulations. These regulations were developed as part of the Clean Water Act Amendments of 1987 to protect the public health and environment from any unreasonable adverse effects of certain pollutants that might be present in biosolids. The District’s biosolids are transported to and stored at the Biosolids Containment Facility for further treatment and drying. The District has used these Class A Biosolids for landscaping at most of the District fa
