초록 ▼

A process for separating water and hydrocarbon from the solids in a petroleum product tank sludge is water-free, solvent-free, conducted at ambient conditions, utilizes no pre-coating with a filter aid, and creates no hazardous environment for filtering finished product sludge, such as gasoline. The

A process for separating water and hydrocarbon from the solids in a petroleum product tank sludge is water-free, solvent-free, conducted at ambient conditions, utilizes no pre-coating with a filter aid, and creates no hazardous environment for filtering finished product sludge, such as gasoline. The process comprises operating a first pump and pumping sludge to a mixing tank and agitating the mixture. Solids content is measured and a determined volume of filter aid is added. The filter aid and sludge are mixed by operation of a mixer assembly which co-acts with baffles in the tank to achieve homogeneity in the mixing tank. A second pump pumps the mixing sludge and filter aid through one of a plurality of alternately selectable sealed horizontal plate filter and recirculates the filtered liquid back through the mixing tank until a desired clarity is reached. The filtered liquid may be pumped to an oil/water separator and the filtrate, or cake, collected on the filter plates is dried, preferably by introduction of an inert gas, and removed to be be taken to a disposal site.

대표청구항 ▼

A filtering process for filtering sludge from a finished product oil storage tank and thereby separating solids from oil and hydrocarbon, the process requiring no added water, solvents or diluents and comprising the steps of: pumping a volume sludge from a finished product oil storage tank to a mixi

A filtering process for filtering sludge from a finished product oil storage tank and thereby separating solids from oil and hydrocarbon, the process requiring no added water, solvents or diluents and comprising the steps of: pumping a volume sludge from a finished product oil storage tank to a mixing tank; mixing the sludge; sampling the sludge to determine solid content; adding filter aid comprising diatomaceous earth to the mixing tank; mixing the filter aid with the sludge in the mixing tank; enclosing and sealing a plurality of filter plates inside a horizontal plate filter; pressurizing said horizontal plate filter by operation of pump means; pumping the sludge from the mixing tank through the horizontal plate filter to filter out solids; recirculating the sludge from the horizontal plate filter back through the mixing tank; and, pumping a purified hydrocarbon and water filtrate from the horizontal plate filter.