Guide to biosolids quality

Abstract

Biosolids are the material produced from digestion of sewage at city wastewater treatment plants. Biosolids may be spread over land for plant fertilization and soil conditioning. This publication summarizes the benefits of land-applied biosolids, describes and discusses major categories of contaminants, and explains what is currently known about emerging contaminants in biosolids. While this publication does not include a comprehensive list of individual contaminants, it does discuss the more relevant classes of contaminants.