Biosolids
Biosolids
Biosolids (/baɪoʊˈsɒlɪdz/) are a type of biological waste product that is treated and processed for beneficial use. The term is often used to describe sludge, a by-product of wastewater treatment processes, that has been treated to meet regulatory standards for land application.
Etymology
The term "biosolids" is a combination of the words "biological" and "solids". It was coined in the late 20th century as a more palatable term for treated sewage sludge.
Definition
Biosolids are primarily organic materials produced during wastewater treatment which are rich in nutrients like nitrogen, phosphorus, and organic matter, making them useful as soil conditioners. They are produced by public and private wastewater treatment facilities and are often used in agriculture and land reclamation.
Types of Biosolids
There are two main types of biosolids: Class A and Class B. Class A biosolids have been treated to reduce pathogens to below detectable levels and can be used without restriction. Class B biosolids, on the other hand, still contain detectable levels of pathogens and are subject to usage restrictions.
Related Terms
- Sludge: A semi-solid slurry that can be produced from a range of industrial processes, including wastewater treatment.
- Wastewater treatment: The process of converting wastewater into water that can be discharged back into the environment.
- Pathogens: Microorganisms that can cause disease in humans or animals.
- Land application: The spreading of materials such as manure or biosolids over agricultural land to improve soil quality.
See Also
External links
- Medical encyclopedia article on Biosolids
- Wikipedia's article - Biosolids
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