Retenção de poluentes em filtros orgânicos operando com águas residuárias da suinocultura

For the utilization of wastewater from swine confinement in fertigation of agricultural crops, mainly in the case of localized irrigation, it is necessary to remove the suspended solids and some of the dissolved ones. Since the use of conventional sand filters for wastewater is not possible there is a need for a study concerning alternative materials that might be used as wastewater filters. The following filtering materials were evaluated: rice husk, coffee husk, sugarcane bagasse, milled corncob, sawdust and fine charcoal. The filtration columns consisting of PVC tubes with 100 mm diameter and 600 mm length were filled with filtering material up to 500 mm height and compression of 12,490 N m-2. Evaluations were performed for the chemical and physical changes occurring in the material following its use as a filter in treatment with swine wastewater. The filtering materials showing a higher retention capacity for the pollutants were the sugarcane bagasse and sawdust.