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The application of nonwoven waste confinement systems in mining, water treatment and environmental solutions

In this paper, four different solutions using nonwoven waste confinement systems produced from polyester with mass per area equal to 600 or 900g/m² are presented. The first case is part of a municipal hydraulic revitalization project in Curitiba/Brazil, where waste confinement systems were installed on site to receive the material accumulated on the bottom of a lake, responsible for it silting. On the second case, the tubes were used to replace slurry desiccation bays from mining. The new alternative increases the efficiency and the quality of the wastewater in the production process. Another case from mining is shown: a mining company that uses filter press for dewatering sludge resulting from the iron ore processing was experiencing operational difficulties because the equipment required periodic maintenance. As an alternative solution for mining tailings dewatering during maintenance periods, avoiding the shutdown of the production process, the company adopted as a solution pumping the sludge directly to the waste confinement systems that drain and stock the material. The last case was a test performed at a water treatment plant. Currently, the sludge produced during treatment is sent directly to a sewage treatment plant. Thus, to avoid network overloading, as it has been happening, solutions are being tested to choose the one with the best cost-benefit. In this context, waste confinement systems were installed to evaluate the dewatering of the sludge with and without polymers.