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Parabolic Screen



Parabolic screen (also known as the hydraulic screen) is a simple, efficient, and convenient maintenance device for intercepting suspended solids in liquid. It is suitable for removing suspended solids from low concentration solutions.
It is commonly used in printing and dyeing wastewater, poultry processing and other industrial wastewater treatment, urban sewage treatment and recycling of useful solid sundries. It is divided into a fixed plane hydraulic screen, fixed curved surface hydraulic screen, and hydraulic rotary screen.
Parabolic screen is generally used to effectively reduce the concentration of suspended solids in water, reduce the treatment load of subsequent processes, and protect water pumps, pipelines, and instruments under the conditions of small treatment water volume and low suspension concentration.

Parabolic Screen Filters
Parabolic Screen Filters

Patented fixing technology: full body rivet fixation.

If you have ever used a parabolic screen filter, you will definitely be troubled by a problem. As the working time increases, the fluid will corrode the body of the equipment. Welding joints, in particular, are most susceptible to corrosion.
After the weld bead is corroded, it indicates that the service life of the parabolic screen has begun to count down. For this reason, we developed a new fixing technology – rivet fixing method.

We conducted a lot of experiments and finally came up with the best rivet fixing solution. This type of fixation has two advantages. The first is that it is not afraid of corrosion and has a solid structure. The second advantage is that the fuselage can be disassembled to facilitate subsequent maintenance.

Characteristics of Parabolic Screen

  • Simple structure. Parabolic screen (hydraulic screen) includes screen, screen frame, water inlet pipe, water distribution pipe, etc.
  • High processing efficiency. When used for sewage treatment, BOD removal efficiency is about equal to the initial sedimentation. For domestic sewage treatment, the flow capacity of the parabolic screen per meter width is about 2000m ³/ d. The function is similar to that of a 180 ㎡ clarifier, and the floor area of a hydraulic screen is less than 5 ㎡.
  • Flush regularly to ensure normal operation.
  • Easy maintenance.

Parabolic Screen Classification

Fixed plane parabolic screen: plane hydraulic screen structure, which is composed of the screen, screen frame, water distribution pipe, and water inlet pipe. The sewage enters the water distribution pipe from the inlet pipe to slow down the flow rate. The inlet water is evenly distributed along the width of the screen, the waterfalls vertically through the screen, and the sundries in the waterfall into the dirt box or trolley along the inclined plane of the screen. It is often used to filter feathers and fluff in sewage from poultry processing.
Fixed curved surface parabolic screen: the structure of the fixed curved surface parabolic screen is composed of stainless steel screen, deflector, water inlet pipe, distribution box, another water inlet, and water outlet. The sewage enters the distribution box from the water inlet pipe, and another kind of water inlet pipe is connected from the lower part of the distribution box. The sewage with a slow flow rate is distributed to the screen along the screen width through the distribution box. The deflector prevents the splash of sewage and makes the sewage filter smoothly along the screen surface. The screen material is stainless steel. The curved surface form and screen aperture can be defined according to the sewage type, generally 16-100 mesh. There are two forms of water outlet: direct inflow channel and flange connection of water outlet.

According to the empirical formula of filter local head loss coefficient under different blocking conditions, it is analyzed that only when the water passing area of the screen is quite small, the blocking degree of the screen has a significant impact on the filter local head loss.

The head loss is related to filtration flow, filtration time, and sediment content of the water source. The effective water discharge area decreases and the local head loss increases.

Under the same discharge, the local head loss of the high mesh parabolic screen is greater than that of the low mesh parabolic screen, and the energy loss is greater. The main reason is that the mesh diameter of the high mesh screen filter is small, the water flow is greatly affected by boundary conditions, the friction and violent collision between particles consume more mechanical energy, and the flow velocity through the mesh increases with the decrease of pore diameter.


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