WJG plate-type Step Grille
Description
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:
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;
Parameter
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;
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Grille Breadth B (mm) |
600~3000 |
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Suggested Grille Breadth B1 (mm) |
B＋100 |
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Effective Filtering Surface Breadth (Plate Breadth) B2 (mm) |
B-150 |
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Suggested Grille Well Height H (m) |
1.5~10 |
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Installation Angle (°) |
60~75 |
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Common Aperture Diameter (mm) |
3，5，6，8，10 |
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Plate Operation Velocity (m/min) |
~3.8 |
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Main Driver Power (kW) |
0.75~3.0 |
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Cleaning Brush Power (kW) |
0.37~0.75 |
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Washing Water Pressure (MPa) |
≥0.3 |
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The Designed Maximum Water Level Difference (m) |
1.0 |
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Unit Discharge Capacity (Reference) |
Aperture: ≤3 |
700 |
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(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 |
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