Patent ID: 6632352
Filing Date: 2003-10-14
Classification: B01D,C02F

Abstract:
A multi-stage filter for clarifying a contaminated fluid comprising:a container having a top, a bottom, and sidewalls; a fluid inlet operably attached to said container; a fluid outlet operably attached to said container; a conduit disposed in the container, one end of said conduit being in fluid communication with one of said inlet and outlet; a first filter spaced form the sidewalls of said container and surrounding a portion of said conduit having an opening therein, said first filter having a predetermined porosity; a second filter spaced from the sidewalls of said container and in juxtaposition to said first filter and surrounding a portion of said conduit, said second filter having a porosity greater than said first filter; wherein discs are disposed inside said container such that: a bottom disc is smaller in size than the container such that fluid flowing in from the inlet will flow between the outer edge of the bottom disc and the container wall; a second disc is spaced above the bottom disc and has the same width and length as the container such that fluid will not pass between the second disc and the container wall, but through openings in the second disc; a third disc is spaced above the second disc and is smaller in size than the container such that fluid flowing in from the second disc will flow between the outer edge of the third disc and the container wall; a plate is spaced above said third disc and disposed next to the bottom of the conduit; and said discs and plate are secured to the bottom of the conduit.