Vermicomposting of solids removed from a screening pre-treatment of swine waste water.

The waste water and manure are residues produced in swine industry. The daily production of wastes in hog farming represents a considerable volume. The contamination of water swine and manure varies due to different concentrations of contaminants. With decomposition of organic matter there are present fly grubs, which spray diseases. Solid wastes provide organic matter and nutrients to the soils. Treatments of waste water swine are: solids removal by sedimentation or screen separator, dewatering by sand filters, physicochemical and anaerobic treatment. All of these procedures generate solid wastes, which have to be treated in order to stabilize them and to reduce their contaminant effects. The purpose of this study was to evaluate the vermicompost efficiency in the stabilization and reduction of contaminants in the waste solids, removed during treatment of swine waste water and to evaluate agronomic characteristics. It was selected a hog farming that raising 5,000 hogs. The effluent was conducted by gravity; the bulk solids were removed by passing water through a mesh and they were used to feed a population of worms (Eisenia, sp.). Once vermicomposting process finished, it was obtained a stabilized biosolid Class A, Excellent Type for using without restrictions.