Name: Biosolids and Residuals

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Description: Certain by-products of wastewater treatment, known as biosolids, and non-hazardous residuals from wastewater treatment, can be used, under certain circumstances, in limited agricultural applications. These uses are governed by Parts III and V of the Guidance and Regulations Governing the Land Treatment of Wastes (7 DE Admin. Code 7103). The biosolids and residuals data shows the location of areas in Delaware where agricultural utilization permits have been issued to allow for the land application of biosolids and non-hazardous waste residuals. BiosolidsSewage sludges that are solid, semisolid, or liquid residues generated during primary, secondary, or advanced treatment of sanitary sewage. Treated sewage sludge that has undergone an approved process to reduce pathogens, a process to reduce the attractiveness of the material to disease carrying vectors (flies, birds, rodents), and that meets regulatory limits for certain pollutants are known as biosolids. Biosolids are typically used as a fertilizer or soil amendment or are disposed of in a landfill.EPA regulations (40 CFR Part 503) establish the minimum national standards for the use and disposal of biosolids. EPA’s standards are incorporated into Delaware regulations. The state’s rules include additional requirements and safeguards that are not required in EPA standards.Non-Hazardous Waste ResidualsNon-hazardous residual materials from waste treatment that do not contain a sanitary waste component can be permitted for agricultural use under Part V of the Guidance and Regulations Governing the Land Treatment of Wastes. These wastes must meet regulatory limits for certain pollutants and must be suitable for use as a fertilizer substitute or as a soil amendment.This layer includes land application sites where non-hazardous waste residuals disposal (were beneficially reused may be a better phrase to describe “disposal” if this description goes on a public server) via land application have been approved. For sites where beneficial reuse of wastewater via spray irrigation has been approved please see the Spray Irrigation layer. For more information please visit https://dnrec.alpha.delaware.gov/water/surface-water/land-treatment/

Copyright Text: Delaware Department of Natural Resources and Environmental Control Division of Water, Surface Water Discharges Section 89 Kings Highway, Dover, DE 19901 302-739-9946

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