Sewage sludge is produced from the treatment of wastewater in sewage treatment plants and consists of two basic forms — raw primary sludge and secondary sludge, also known as activated sludge in the case of the activated sludge process.

2023年12月4日 · What Is Sewage Sludge and What Can Be Done with It? In this document, "sewage sludge" will refer to wastewater treatment solids generally, and "biosolids" will refer specifically to material that is suitable for land application.

2025年1月6日 · When domestic sewage is transported and conveyed to a wastewater treatment plant (WWTP), it is treated to separate liquids from the solids, which produces a semi-solid, nutrient-rich product known as sewage sludge.

7 小时之前 · Her concern stems from a newly released EPA Draft Sewage Sludge Risk Assessment, which found that PFAS chemicals, particularly PFOA and PFOS, are widespread in biosolids — treated sewage sludge ...

Sewage sludge treatment describes the processes used to manage and dispose of sewage sludge produced during sewage treatment. Sludge treatment is focused on reducing sludge weight and volume to reduce transportation and disposal costs, and on reducing potential health risks of disposal options.

2025年1月14日 · The EPA has released a draft sewage sludge risk assessment for PFOA and PFOS that indicates these chemicals may be present in sewage sludge at concentrations that may adversely affect human health and the environment.

2025年1月17日 · Sewage sludge is the solid, semisolid, or slurry residual material that is produced as a by-product of wastewater treatment processes. This residue is commonly classified as primary and secondary sludge.

Sewage sludge, the slurry residue generated from the wastewater treatment process, is mainly composed of the solid portion of the sewage (primary sludge), and the microbial cells produced during the aerobic treatment of the wastewater (secondary sludge). The treatment and stabilization of sewage sludge have become major contributors to the ...

WASHINGTON – Today, Jan. 14, the U.S. Environmental Protection Agency released a draft risk assessment, or scientific evaluation of the potential human health risks associated with the presence of toxic per- and polyfluoroalkyl substances (PFAS) chemicals in biosolids, also known as sewage sludge.

2024年10月23日 · Sewage sludge, also known as biosolids, has been in the news recently for its inclusion of toxic PFAS (Forever Chemicals, a category of about 15,000 compounds that don’t break down naturally, but accumulate in the human body and the environment, including food crops and livestock).