Screen type ladder grille decontamination machine/WJG plate-type
Step Grille
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 |
