What are the two classes of Biosolid Pathogens?

The classification of biosolid pathogens into Class A and Class B is based on the level of treatment that the biosolids undergo, which directly affects their safety for land application and potential risks to human health and the environment.

Class A pathogens are those that have been treated to a level that significantly reduces their presence, making them safe for unrestricted use. This means that they do not pose a risk to public health or the environment when applied to land. The treatment processes for Class A typically involve advanced methods such as high heat or specific chemical processes that eliminate pathogens effectively.

In contrast, Class B pathogens have undergone treatment that reduces pathogen levels but still allows for some level of risk. These biosolids can be used but typically require certain restrictions or precautions, such as specific application methods and buffer zones to minimize human exposure.

Understanding the distinction between these two classes is crucial for nutrient management practices, as it informs regulations, application methods, and safety measures when handling and using biosolids in agricultural or land reclamation efforts.