Abstract: A system for removing free-oils, particulate matter and dissolved heavy metals from an aqueous surfactant solution employed in the degreasing and cleaning of parts in a parts washer. The system includes a primary filter assembly containing an oil absorbent, a particulate matter filter and a filter element having metal particles bound together in a porous metal sponge-like structure. The system can also include a secondary filter assembly capable of removing residual free, dissolved and emulsified oils, particulate matter and dissolved heavy metals from the filtrate produced by passage of the contaminated aqueous surfactant solution through the primary filter assembly.

Abstract: A suction skimmer for removing an upper portion of a liquid from a vessel under substantially laminar flow conditions which includes a body member having a fluid flow passageway extending therethrough and at least one slot formed in an upper portion of the body member which openly communicates with the fluid flow passageway. The suction skimmer also includes a throttle assembly for varying the length of the slot in the body member.