US 5,341,826 A · Apparatus for compressing and washing contaminated raked-off or screened material, particularly in sewage treatment plants

Abstract

An apparatus for compressing and washing contaminated raked-off or screened material, particularly in sewage treatment plants, having a screw conveyor device with horizontal shafts (2, 3). There is a washing zone (33) with washer nozzles (34, 38) and compacting zones (21, 47) arranged before and after the washing zone. The washing zone (33) is divided into two sections (31, 32) adjacent to each other, in each of which a defined water level (35), occupying approx. 1/4 to 1/3 of the height of the cross-section of the housing (1), is present. In the first section (31) of the washing zone (33), the washer nozzles (34, 36) are arranged both above and below the water level (35). In the second section (32) of the washing zone (33), the housing for the screw conveyor device is provided with openings (40) arranged laterally to define the water level.

Claims20

Dependent claims

Apparatus for compressing and washing contaminated raked-off or screened material, particularly in sewage treatment plants, with a screw conveyor device having a housing with fed hopper, therein a shaft mounted horizontally on bearings and provided with a drive, and a conveyor helix arranged on the shaft, and with a washing zone and washer nozzles arranged therein for the supply of wash water, as well as compacting zones, constructed without conveyor helices, arranged both before and after the washing zone, characterized in that the washing zone (33) is divided into two sections (31, 32) adjacent to each other, in each of which a defined water level (35, 39), occupying approx. 1/4 to 1/3 of the height of the cross-section of the housing (1), prevails, that the washer nozzles (34, 36) are located both above and below the water level (35) in the first section (31) of the washing zone (33), and that in the second section (32) of the washing zone (33), the housing for the screw conveyor device is provided with openings (40) arranged laterally to define the water level.

An apparatus for compressing and washing contaminated raked-off screened material in a waste water treatment plant comprising:

a housing (1) defining a feed hopper (8) at one end of said housing;
upper and lower elongated horizontally extending conveyors (7, 30) arranged to move material from said feed hopper in a first direction in said housing along said upper helix conveyor (7) and subsequently in the opposite direction in said housing along said lower helix conveyor (30);
drive means (6, 28) for rotating said upper and lower helix conveyors;
a washing zone (33) having first (31) and second (32) sections positioned in sequence in said housing along the length of said lower helix conveyor;
a first material compacting zone (21) positioned in said housing along said upper helix conveyor upstream of said washing zone, and a second material compacting zone (47) positioned in said housing along said lower helix conveyor downstream from said washing zone;
means for maintaining a level of water (35, 39) in said washing zone between approximately one-quarter and one-third of the height of the housing (1) of said second section (32) of said washing zone (33);
and
a plurality of washing nozzels (34, 36) positioned in said first washing zone (31) above and below the water level (35) maintained in said first washing zone for washing the material as the material moves from said first compacting zone to said second compacting zone.

5 more elements

Dependencies are inferred from the claim text.

Apparatus for compressing and washing contaminated raked-off or screened material, particularly in sewage treatment plants

Life of this patent

Apparatus for compressing and washing contaminated raked-off or screened material, particularly in sewage treatment plants

Life of this patent

Abstract

Claims20