Environmentally acceptable and financially feasible ways of disposing byproducts from pulpand paper mills has been a major challenge to this sector. Disposal in landfills is onerous,involving major responsibilities related to high costs and timelines that can drag on. Applyingthese byproducts in forest plantations solves the environmental problem of disposal whilesimultaneously helping to replace nutrients that are removed in harvesting forest biomass,contributing to sustainability in forestry. Different raw materials and industrial processes (formanufacturing as well as wastewater treatment) lead to byproducts with distinctcharacteristics. In the case of recycling paper scraps, because of the nature of the raw materialbeing processed, the sludge remaining after wastewater treatment has unique characteristicscompared to sludge from pulp and paper production that require study. This project continuesexperiments installed in Rio Negrinho, Santa Catarina to study the effects of applying doses ofcellulose sludge as an input in plantations of Pinus taeda and Eucalyptus dunnii pertaining toforest-based companies. This partnership makes it possible to aggregate technical informationto the knowledge base that currently exists on this topic, so it can be applied in similarsituations. By the end of the test period, the goal is to obtain data to assess the technicalfeasibility of using this sludge as a forest input.