WJG plate-type Step Grille
WJG plate-type Step Grille
  • Description
  • Parameter
  • Video
Application
As it has good adaptability to and removal effect of fine particles and fiber waste contained in sewage, it is widely applied in the upgrading reconstruction, reinforced pre-treatment technological processes of sewage treatment plants.

Advantages
■ Adopt step-type punching plate design, have large filtering area, easily retain contaminants, and have high filter efficiency;
■ Be especially strongly adaptable to fiber wastes;
■ Adopt the box-plate-type structure, have firm structure and high symmetry, operate stably and be easy to install;
■ In the structure design, fully consider about the sewage environment and heavy-duty drag chain as the driving body of the filter plate;
■ Have no underground bearing structure, greatly reduce the underground failure probability, and operate more reliably;
■ Adopt high-efficiency brush and back-wash devices to unload contaminants and ensure the effective regeneration of filtering surface;
■ Adopt the front and back closed construction on the top, directly connect with the grille slag conveyor, and improve the working environment;
■ The equipment can be under full-automatic operation control according to the water level difference or at regular time to reach the best energy-saving effect;

Grille Breadth B (mm)

600~3000

Suggested Grille Breadth B1 (mm)

B+100

Effective Filtering Surface Breadth (Plate Breadth) B2 (mm)

B-150

Suggested Grille Well Height H (m)

1.5~10

Installation Angle (°)

60~75

Common Aperture Diameter (mm)

3,5,6,8,10

Plate Operation Velocity (m/min)

~3.8

Main Driver Power (kW)

0.75~3.0

Cleaning Brush Power (kW)

0.37~0.75

Washing Water Pressure (MPa)

≥0.3

The Designed Maximum Water Level Difference (m)

1.0

Unit Discharge Capacity (Reference)

Aperture: ≤3

700

(m3/m2.h)* (Water Velocity)

Aperture: 4~6

900

0.8m/s, Effective Water Depth 1m)

Aperture: 7~10

1200


The technological calculation process is as follows:
■ Discharge capacity (m3/h) = Unit discharge capacity (m3/m2. h) × Effective discharge area (m2)
■ Effective discharge area (m2) = Effective water depth (m) × Effective filtering surface breadth (m)
■ Effective water depth (m) (the design well water velocity is 0.8m/s) = Grille water depth (m) – Water head loss (m)
■ The reference values of water head losses are shown in the table below:

Water Head Loss of Grilles with Different Apertures

Aperture: ≤3mm

0.6

Loss Reference Value (m)

Aperture: 4~6mm

0.5

(Water Velocity 0.8m/s)

Aperture: 7~10mm

0.4