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Abstract
The biosolids resulting from the sludge treatment from sewage treatment plants improve soil conditioning and are rich in nutrients. However, despite the benefits to soil and plants, as well as the sustainable appeal, the agricultural use of biosolids in Brazil is still not widespread. In this Technical Note (TN), the objective is to present some Brazilian experiences with biosolids in the light of relevant legislation, as well as to discuss aspects and potential related uses. Paraná and São Paulo states are the main references in agricultural use, with experiences of sanitization with alkaline stabilization and composting. In this TN the criteria for the use of biosolids are presented, according to the new CONAMA Resolution 498/2020, as well as the challenges related to the agricultural sector and public acceptance. Public policies to support rural producers for the application of biosolids are also discussed, to promote transformation of a rich by-product of sewage treatment into a resource for agricultural use, in a vision of circular economy.
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