Biosolids are the semisolid material that remains after wastewater treatment has been completed and the treated liquid effluent is discharged into receiving waters. With further processing, they constitute a rich source of nutrients for plants that can augment or replace chemical fertilizers. King County has been a leader in developing biosolids recycling programs and is committed to supporting its existing markets and developing new markets for beneficial uses of biosolids products. The Roads Maintenance Section of the Road Services Division of the King County Department of Transportation, has been a strong proponent of environmentally preferable practices for many years. Road's routinely recycles concrete, asphalt, soils, wood and other construction materials.
Roads also uses recycled content materials such as plastic lumber, and compost.
The program assembles information about these products and makes it available to specific agency users who can evaluate them and attempt to develop applications in County projects. These procurement bulletins contain information about the results of product evaluations and other accomplishments of County agencies. We hope this information will help you find ways to use recycled materials in the work of your agency and that you will contact us if we can help you with further information or if you have suggestions. By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site.