Floating matter removal in a primary sedimentator with a clean natas

Abstract

The floating material incorporated into the domestic sewage water, does represent a heavy contaminant component in incoming water to be treated in the primary sedimentation unit. The removal of such material by the use of an innovation called, “Surface manual lateral scum remover”, in Spanish, Limpia Natas Manual Lateral Milian1, identified with the acronym “LNMLM1”, by means of which a quick removal of the crust or floating material, diminishes almost immediately the inherent heavy organic components. As a result of the use of the LNMLM1, the turbidity diminishes from 190 to 80 UNT, the DQO, from 539 to 322 mg/L, and the DBO, from 429 to 254 mg/L. Historically in 1931Link Belt Co built the Scum Removers. This device has evolved into the actual endless chains made of stainless steel which remove the upper crust of scum toward a deposit that is evacuated and to be treated as solids. In this case there is a conventional sedimentation unit without electrical equipment, in which the author has developed and installed, a device to clean the upper crust on the surface.