Organic fertilizer or soil amendments produced by the treatment of domestic wastewater. Biosolids consist primarily of dead microbes and other organic matter. Untreated sludge or sludge that does not conform to regulated pollutants and pathogen treatment requirements are not considered biosolids.
Biosolids are complex mixtures that can contain pollutants from household, commercial and industrial wastewaters with organic contaminants (such as pharmaceuticals), inorganic contaminants (metals and trace elements) and pathogens (bacteria, viruses and parasites). Depending upon the extent of treatment, biosolids are often applied such areas as farms, parks, golf courses, lawns and home gardens.
A term used to describe the primarily organic solid product, produced by wastewater treatment processes, that can be beneficially recycled. Beneficial recycling includes land application to improve soil characteristics, heat and energy recovery, and production of useful products. Biosolids must meet certain government specified criteria depending on its use (e.g., fertilizer or soil amendment).
Solid organic matter recovered from municipal wastewater treatment that can be beneficially used, especially as a fertilizer. “Biosolids” are solids that have been stabilized within the treatment process, whereas “sludge” has not.
A nutrient-rich organic material resulting from the treatment of wastewater. Unprocessed wastewater treatment sludge must at least be digested before being referred to as biosolids. Biosolids contain nitrogen and phosphorus along with other supplementary nutrients in smaller doses, such as potassium, sulfur, magnesium, calcium, copper and zinc.
a nutrient-rich organic material resulting from the treatment of wastewater. Biosolids contain nitrogen and phosphorus along with other supplementary nutrients in smaller doses, such as potassium, sulfur, magnesium, calcium, copper and zinc. Soil that is lacking in these substances can be reclaimed with biosolids use. The application of biosolids to land improves soil properties and plant productivity, and reduces dependence on inorganic fertilizers.
The organic product that results from sewage treatment processes (ie material referred to alternatively as sewage sludge). Solids become biosolids when they come out of a digester or other treatment process and can be beneficially used. Until such solids are suitable for beneficial use, they are defined as wastewater solids. The solids content in biosolids should be equal to or greater than 0.5% (w/v).
Biosolids are nutrient-rich solid materials that are produced from the organic residuals that are a byproduct of the treatment of domestic wastewater in a wastewater treatment plant. To create biosolids, these residuals are further treated to reduce pathogens and vector attraction by any of a number of approved methods.