Solids Process Design and Management, 2nd Edition

In the last 10 years, there has been continued changes in solids management. For example, incineration, which was a viable disposal method, has been affected by U.S. EPA’s Sewage Sludge Incinerator (SSI) rules. Emerging compounds, such as PFAS/PFOAS have affected land application, with at least one state banning land application of biosolids. Intended for use by professionals engaged in the design, approval, and operation of solids treatment and disposal systems, this update addresses many of the changes that have occurred over the past decade, incorporating material published as recently as 2022. Wastewater continues to require increasing levels of treatment, especially as we begin to consider our facilities as water resource recovery facilities. This will yield more solids that, at the least, need to be managed in an efficient and effective manner to protect human health and the environment. Preferably, we can treat these solids as resources, recovering biogas from the digestion process and phosphorus from the biosolids. It is highly recommended that design standard setting organizations embrace the changes incorporated in this design publication. Recommendations in this publication represent best practices that go well beyond the minimum design requirements necessary to comply with requirements of U.S. EPA’s Standards for the Use or Disposal of Sewage Sludge (40 CFR Part 503). This is increasingly important for biosolids management to remain viable and environmentally sustainable in the future.