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A method and system for separating a particulate contaminate from a contaminated liquid medium involves filtering the contaminated liquid medium with a filter element having an afflux surface made of plastic particles that are sintered together. The contaminated liquid medium is introduced into a ve

A method and system for separating a particulate contaminate from a contaminated liquid medium involves filtering the contaminated liquid medium with a filter element having an afflux surface made of plastic particles that are sintered together. The contaminated liquid medium is introduced into a vessel, brought into contact with the filter element, where the liquid medium is separated from the particulate contaminant, and the separated liquid medium withdrawn from the filter element.

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What is claimed is: 1. In a liquid filtration system comprising a vessel, a contaminated liquid medium containing a particulate contaminant provided in the vessel, a filter element provided in the contaminated liquid medium for separating the liquid medium from the particulate contaminant and means

What is claimed is: 1. In a liquid filtration system comprising a vessel, a contaminated liquid medium containing a particulate contaminant provided in the vessel, a filter element provided in the contaminated liquid medium for separating the liquid medium from the particulate contaminant and means for removing the separated liquid medium from the filter element, the improvement comprising the filter element is formed from sintered-together plastic particles and has substantially the shape of a narrow, hollow box with two large zigzag or corrugated first side walls having peaks and valleys, two narrow second side walls interconnect the first side walls, a bottom side and an opposite top side, the peaks and valleys of the first side walls extend in the direction from the bottom side to the top side and the top side further has a head attached thereto which is elongate and constitutes at least one flow passage, the filter element further comprising two unified halves, each half containing one of the first side walls, the head being provided on the first and second side walls such that the head surrounds and seals an outer surface of the first and second side walls with a first part of its height and extends beyond the first and second side walls with a second part of its height and an afflux surface of the filter element consists essentially of sintered-together plastic particles; a filter pump for removing clean liquid medium and a back-flush booster pump connected to the discharge of the filter pump for pressurizing a filter element and removing a deposited particulate layer therefrom; and a pressure accumulator and a pressure switch provided in the discharge of the back-flush booster pump. 2. The system of claim 1, wherein a second head which is elongate and constitutes at least one flow passage is provided on the bottom side. 3. The system of claim 1, wherein the bottom side is closed and a foot is provided thereon. 4. The system of claim 1, wherein the head is made of a synthetic resin and cast on the first and second side walls. 5. The system of claim 1, wherein the head has a rectangular cross-section in an upper portion thereof which gradually transitions to a space provided between the first side walls. 6. The system of claim 1, wherein the liquid medium is a coolant used in metal working. 7. The system of claim 1, wherein the particulate contaminant is at least one member selected from the group consisting of: metal, glass, plastic, ceramic and rubber. 8. The system of claim 1, wherein the liquid medium comprises water. 9. The system of claim 1, wherein the liquid medium comprises an organic compound. 10. The system of claim 1, wherein the particulate contaminant is a non-ferrous metal. 11. The system of claim 1, wherein the particulate contaminant is a ferrous metal. 12. The system of claim 1, wherein the contaminated liquid medium is selected from the group consisting of waste water containing dirt and particulate contaminants and ballast water containing indigenous species. 13. The system of claim 1, wherein the improvement additionally comprises a plurality of filter elements formed from sintered-together plastic particles are provided in the contaminated liquid medium and the filter elements are mounted in a vertical orientation. 14. The system of claim 1, wherein the improvement additionally comprises a plurality of filter elements formed from sintered-together plastic particles are provided in the contaminated liquid medium and the filter elements are mounted in a horizontal orientation. 15. The system of claim 1, wherein the improvement additionally comprises means for removing the separated contaminant from the bottom of the vessel. 16. In a liquid filtration system comprising a vessel, a contaminated liquid medium comprising a coolant used in metal working and a particulate contaminant comprising at least one member selected from the group consisting of metal, glass, plastic, ceramic and rubber provided in the vessel, a filter element provided in the contaminated liquid medium for separating the liquid medium from the particulate contaminant and means for removing the separated liquid medium from the filter element, the improvement comprising the filter element is formed from sintered-together plastic particles and has substantially the shape of a narrow, hollow box with two large zigzag or corrugated first side walls having peaks and valleys, two narrow second side walls interconnect the first side walls, a bottom side and an opposite top side, the peaks and valleys of the first side walls extend in the direction from the bottom side to the top side and the top side further has a head attached thereto which is elongate and constitutes at least one flow passage, the filter element further comprising two unified halves, each half containing one of the first side walls, the head being provided on the first and second side walls such that the head surrounds and seals an outer surface of the first and second side walls with a first part of its height and extends beyond the first and second side walls with a second part of its height and an afflux surface of the filter element consists essentially of sintered together plastic particles; a filter pump for removing clean liquid medium and a back-flush booster pump connected to the discharge of the filter pump for pressurizing a filter element and removing a deposited particulate layer therefrom; and a pressure accumulator and a pressure switch provided in the discharge of the back-flush booster pump. 17. The system of claim 16, wherein a second head which is elongate and constitutes at least one flow passage is provided on the bottom side. 18. The system of claim 16, wherein the bottom side is closed and a foot is provided thereon. 19. The system of claim 16, wherein the head is made of a synthetic resin and cast on the first and second side walls. 20. The system of claim 16, wherein the head has a rectangular cross-section in an upper portion thereof which gradually transitions to a space provided between the first side walls. 21. The system of claim 16, wherein the improvement additionally comprises a plurality of filter elements formed from sintered-together plastic particles are provided in the contaminated liquid medium and the filter elements are mounted in a vertical orientation. 22. The system of claim 16, wherein the improvement additionally comprises a plurality of filter elements formed from sintered-together plastic particles are provided in the contaminated liquid medium and the filter elements are mounted in a horizontal orientation. 23. The system of claim 16, wherein the improvement additionally comprises means for removing the separated contaminant from the bottom of the vessel.