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(EPA) defines the two terms - sewage sludge and biosolids - in the Code of Federal Regulations (CFR), Title 40, Part 503 as follows: Sewage sludge refers to the solids separated during the treatment of municipal wastewater (including domestic septage). In contrast, biosolids refers to treated sewage sludge that meets the EPA pollutant and pathogen requirements for land application and surface disposal. A similar definition has been used internationally, for

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