WUXI CHENENG ENVIRONMENTAL ENGINEERING & EQUIPMENT CO.,LTD
WUXI CHENENG ENVIRONMENTAL ENGINEERING & EQUIPMENT CO.,LTD Environmental solution
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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 |
