Abstract 1. IN A PROCESS FOR REMOVING SOLIDS FROM A LIQUID PASSED THROUGH A FILTER MEDIA CONSISTING OF DISCRETE PARTICLES, THE IMPROVEMENT COMPRISING PASSING SAID LIQUID THROUGH FILTER COMPRISING: (A) A BED HAVING A CONTINUALLY INCREASING NUMBER OF PARTICLES PER UNIT AREA IN THE DIRECTION OF WATER FLOW THROUGH THE BED; (B) SAID PARTICLES COMPRISING DISCRETE PARTICLES OF SINTERED POLYVINYL CHLORIDE HAVING A PARTICLE SIZE RANGE OF FROM ABOUT 6 TO ABOUT 60 MESH, A BULK DENSITY OF FROM ABOUT 18 LBS. PER CUBIC FOOT TO ABOUT 30 LBS. PER CUBIC FOOT, AND A POROSITY OF FROM ABOUT 25 PERCENT OF ABOUT 55 PERCENT; (C) SAID PARTICLES COMPRISING INTERMIXED FILTER MEDIA OF AT LEAST TWO DIFFERENT SPECIFIC GRAVITIES; AND (D) THERE BEING AT LEAST 10 PERCENT BY WEIGHT OF A MEDIA OF EACH SPECIFIC GRAVITY PRESENT. D R A W I N G
IN A PROCESS FOR REMOVING SOLIDS FROM A LIQUID PASSED THROUGH A FILTER MEDIA CONSISTING OF DISCRETE PARTICLES, THE IMPROVEMENT COMPRISING PASSING SAID LIQUID THROUGH FILTER COMPRISING: (A) A BED HAVING A CONTINUALLY INCREASING NUMBER OF PARTICLES PER UNIT AREA IN THE DIRECTION OF WATER FLOW THROUGH THE BED; (B) SAID PARTICLES COMPRISING DISCRETE PARTICLES OF SINTERED POLYVINYL CHLORIDE HAVING A PARTICLE SIZE RANGE OF FROM ABOUT 6 TO ABOUT 60 MESH, A BULK DENSITY OF FROM ABOUT 18 LBS. PER CUBIC FOOT TO ABOUT 30 LBS. PER CUBIC FOOT, AND A POROSITY OF FROM ABOUT 25 PERCENT OF ABOUT 55 PERCENT; (C) SAID PARTICLES COMPRISING INTERMIXED FILTER MEDIA OF AT LEAST TWO DIFFERENT SPECIFIC GRAVITIES; AND (D) THERE BEING AT LEAST 10 PERCENT BY WEIGHT OF A MEDIA OF EACH SPECIFIC GRAVITY PRESENT.
Claim 2
Dependent Claim
134 words
IN A PROCESS FOR REMOVING SOLIDS FROM A LIQUID PASSED THROUGH A FILTER MEDIA CONSISTING OF DISCRETE PARTICLES, THE IMPROVEMENT COMPRISING PASSING SAID LIQUID THROUGH FILTER COMPRISING: (A) A BED HAVING A CONTINUALLY INCREASING NUMBER OF PARTICLES PER UNIT AREA IN THE DIRECTION OF WATER FLOW THROUGH THE BED; (B) SAID PARTICLES COMPRISING DISCRETE PARTICLES OF SINTERED POLYVINYL CHLORIDE HAVING A PARTICLE SIZE RANGE OF FROM ABOUT 6 TO ABOUT 60 MESH, A BULK DENSITY OF FROM ABOUT 18 LBS. PER CUBIC FOOT TO ABOUT 30 LBS. PER CUBIC FOOT, AND A POROSITY OF FROM ABOUT 25 PERCENT OF ABOUT 55 PERCENT; (C) SAID PARTICLES COMPRISING INTERMIXED FILTER MEDIA OF AT LEAST TWO DIFFERENT SPECIFIC GRAVITIES; AND (D) THERE BEING AT LEAST 10 PERCENT BY WEIGHT OF A MEDIA OF EACH SPECIFIC GRAVITY PRESENT.