How to choose best Screening option for your Industrial WWTP?
Screens are categorized based on the size of the material to be removed. The "size" of a screen material is its diameter. In addition to screen size, other design considerations include channel depth, width, approach speed, ejection height, screen angle, wind, aesthetic considerations, and redundancy and head loss.
With the removal of suspended solids and 20-35% of BOD-5, the fine screen can be fixed or moved, but it is permanently set in a vertical, tilted, or horizontal position and needs to be cleaned with a rake, teeth, or brush.
Which pollutants are contained in the wastewater?
High levels of fats, oils and greases (FOGs) are common in many industrial plants. Screening should be designed to accommodate the maximum FOG load possible with these operations. Other pollutants in the wastewater should also be considered when choosing screening options, such as corrosives, salts, and surfactants such as chemicals used in the facility's cleaning process.
What is the flow rate?
The speed at which wastewater passes through the screen is also an important factor to consider when choosing. Screening decisions should be based on the maximum flow rate possible for optimal efficacy. Low flow rates should also be considered. Screens designed for high flow rates installed in low flow facilities cause solid sedimentation and other operational problems.
How important are the by-products?
In order to determine the type of screen required for an industrial application, it is also necessary to determine what the screens need to capture and what it does not. For many industrial applications, particles of a particular size need to be sorted from wastewater and reused for other purposes. Sifted by-products can be a source of revenue for your company and cannot be ignored. After determining the target size of particles to be captured, you can select a sieve with an appropriately large opening.
Which solids are contained in the wastewater?
If you do not consider the type and morphology of solids in the wastewater when choosing a rake, the rake can be "blind".
Objects such as hair, fibres, and other thread-like substances can get caught in the screen openings and cause clogging. Feathers that are thin on one end and large on the other are also slippery and can clog screen openings and block flow. However, there are some types of strainers and design features that can prevent clogging if you have an accurate grasp of the solids in the wastewater.
Some industrial applications may require a self-cleaning screen or a screen with a solids brushing mechanism. Techniques for keeping solids away from screen openings can also be added to the screening system.
There are also a variety of different sewage supply systems that initiate the flow to the trommel screen, bounce and move solids, and flush through openings. You can easily drain the liquid by keeping the flow path open. The bottom line is that you need a screen design so that when your own solids get into the screen, they are also washed away.
What is a complete sewage treatment system?
Many industrial plants require multiple screens for different wastewater streams throughout the plant. It is important to know what other screens and treatments are used at the facility to determine what type of screen should be installed.
Screens are an important cost saving unit of water treatment plants and Netsol can guide and fulfil all you requirements from design to manufacture, to installation of the whole WWTP including screen designs of both coarse and fine type.