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Is there a difference between biosolids and sewage sludge?

April 26, 2017biosolids sewage sludge

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Is there a difference between biosolids and sewage sludge?

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The word “sludge” usually refers to an unusable semi-solid waste. The word “biosolids” was selected for wastewater residuals to highlight the fact that they can be beneficially recycled to farmland as a final step in the treatment process.

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Yes. Biosolids are not sewage sludge. Sewage sludge includes untreated solids from wastewaters that remain after processing in a municipal wastewater treatment plant. Biosolids are treated to remove all, or nearly all, of the pathogens that can be found in sludge.