Device for the biological purification of sewage

Claim 1

IN A SEWAGE FILTERING DEVICE, A CHAMBER CONTAINING BIOLOGICAL TRICKLING FILTER MEDIA, A ROTATING DISTRIBUTOR CENTRALLY MOUNTED TO ROTATE OVER SAID MEDIA, SAID DISTRIBUTOR COMPRISING A CENTRAL ROTATABLE DISTRIBUTOR HEAD RIGIDLY CARRYING A PLURALITY OF DISTRIBUTOR ARMS RADIALLY EXTENDING THEREFROM, SAID DISTRIBUTOR ARMS COMPRISING A PLURALITY OF SPRAYING ARMS HAVING A PLURALITY OF LONGITUDINALLY SPACED DISCHARGE OPENINGS OF A GIVEN CROSS SECTION EXTENDING ALONG EACH OF SAID SPRAYING ARMS AND FACING OUTWARDLY ON OPPOSITE SIDES OF SAID SPRAYING ARMS AND FACING OUTWARDLY AGE IN FINELY DIVIDED CONDITION OVER THE WIDEST POSSIBLE SURFACE OF SAID FILTER MEDIA, AND MEANS FOR ROTATING SAID DISTRIBUTOR HEAD COMPRISING ONE OF SAID DISTRIBUTOR ARMS COMPRISING AN AGITATOR ARM, SAID AGITATOR ARM HAVING A PLURALITY OF LONGITUDINALLY SPACEDE JET OPENINGS OF A LARGER CROSS SECTION THAN SAID GIVEN CROSS SECTION OF SAID DISCHARGE OPENINGS DISTRIBUTED ALONG SAID AGITATOR ARM FOR DIRECTING CONCENTRATED JETS OF SEWAGE UPON THE SURFACE OF THE FILTER MEDIA FOR AGITATING SAID SURFACE, ALL OF SAID JET OPENINGS IN SAID AGITATOR ARM FACING IN ONE DIRECTION ONLY.