The different classes have specified treatment requirements for pollutants, pathogens and vector attraction reduction, as well as general requirements and management practices. Biosolids are divided into “Class A” and “Class B” designations based on treatment methods. The presence of biosolids odors does not mean that the biosolids pose harm to human health and the environment.Įxisting requirements and guidance help ensure that biosolids are processed, handled, and land-applied in a manner that minimizes potential risk to human health. Meteorological conditions such as wind speed and direction, relative humidity, and temperature can impact nuisance odors. Federal and State Requirements for Use or Disposal of Biosolidsīiosolids may emit a distinctive odor depending on the treatment process and methods used. The odorous compounds generated and detected most often are ammonia, amines, and reduced sulfur-containing compounds.Biosolids also may be disposed of by incineration, landfilling, or other forms of surface disposal. Land application of biosolids also can have economic and waste management benefits (e.g., conservation of landfill space reduced demand on non-renewable resources like phosphorus and a reduced demand for synthetic fertilizers). When applied to land at the appropriate agronomic rate, biosolids provide a number of benefits including nutrient addition, improved soil structure, and water reuse. Examples of beneficial use include application to agricultural land and reclamation sites (e.g. The terms ‘biosolids’ and ‘sewage sludge’ are often used interchangeably.īiosolids that are to be beneficially used must meet federal and state requirements. ![]() ![]() ![]() Those solids are then treated physically and chemically to produce a semisolid, nutrient-rich product known as biosolids. Biosolids are a product of the wastewater treatment process. During wastewater treatment the liquids are separated from the solids.
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