초록 ▼

Liquid is purified by passing it through a bed containing disc-shaped buoyant media beads having grooved surfaces. Such beads are formed from a polymeric pellets. The pellets are passed through a scarifier to roughen their surfaces. Pellets are also passed through a rolling mill which grooves the pe

Liquid is purified by passing it through a bed containing disc-shaped buoyant media beads having grooved surfaces. Such beads are formed from a polymeric pellets. The pellets are passed through a scarifier to roughen their surfaces. Pellets are also passed through a rolling mill which grooves the pellets and compresses them into disc-like shapes.

대표청구항 ▼

1. A bead which:is made of a water insoluble polymeric material so that the bead is suitable for use in a water purification beds; is disc-shaped, having an upper surface with a generally elliptical perimeter, a lower surface with a generally elliptical perimeter, and an annular edge surface that ex

1. A bead which:is made of a water insoluble polymeric material so that the bead is suitable for use in a water purification beds; is disc-shaped, having an upper surface with a generally elliptical perimeter, a lower surface with a generally elliptical perimeter, and an annular edge surface that extends between the perimeters of the upper and lower surfaces; has a diameter of 3 to 6 mm; and has a thickness, as measured between the most closely spaced parallel planes between which the bead will fit, of 1.2 to 2.5 mm.