Multi-layer filter for separating solid and liquid waste

Abstract

A flexible, multi-layer filter for separating solid and liquid wastes. In a preferred embodiment, the filter includes first, second, third, and fourth layers, interconnected by appropriately spaced connectors. The first layer comprises sub-layers of parallel strands, wherein the strands in one sub-layer cross and overlap the strands in the other sub-layer to form a netting. The second layer comprises a fibrous mat, and the third layer comprises a netting like that of the first layer. The fourth layer includes a porous filter cloth. The third layer may be cut to form end and side tabs for retaining the filter inside a conventional waste container. After a semi-solid mixture of waste is poured, dumped, or otherwise placed into the waste container, liquid waste passes through the filter layers under the force of gravity. The liquid waste is channelled through the first layer along the bottom of the waste container. The liquid waste may be discharged from the container by opening a drain, or by slightly-opening a gate in the waste container. The invention is especially effective for extracting liquid waste from semi-solid materials, such as catalysts produced in petroleum refining, industrial process sludges, slurries, sewage matter, and materials collected in storm drains such as grit, rocks, leaves, silt, and dirt.