How many types of bar screens used in Sewage treatment plants?
It's crucial to avoid clogging for on-going and smooth operation of sewage treatment plants. There are different types of bar screens used in sewage treatment plants.
Netsol Water also provides a variety of bar screens, because we know the water flow must always be constant and there must be no damage to downstream equipment’s.
Let’s understand the different types of bar screens used in STPs!
· Manual Screening System
Raking is frequently required to get rid of collected trash on manual bar screens. This approach requires a lot of labour, as one might anticipate.
Thus, manual screens are only used as the principal screening system in older sewage treatment plants. With smaller facilities and bypass channels, it is especially helpful.
Size of manual bar screens
The apertures range in size from one inch to two inches. Better cleaning is made possible by the 30 to 45-degree inclination of the bars. These bar screen varieties have a significantly greater area immersed underwater.
This makes raking less frequently necessary, but it still takes time. But, for easy raking, they shouldn't be any bigger than 3 meters.
Moreover, cleaning can be risky, and the time required to clean could result in an overflow. Flow surges could also happen when it is being cleaned. Even in smaller factories, the usage of manual bar screens is dwindling in favour of automated procedures.
Advantages of Manual bar Screens
The equipment requires very minimal maintenance. Manual bar screens can also be used by small plants with few screenings.
New plants use it as a precaution in the event that the main screening system breaks down.
· Mechanical Bar Screen
To maintain the screens clean and clear of particles, they employ an automatic cleaning procedure.
Because, to the fact that the debris won't build-up, there are minimal worries of an overflowing backwater in these screens. To transport the material to a disposal facility, they typically have a screening compactor nearby.
Mechanical screens not only make cleaning easier but also enhance flow conditions. This approach lowers labour expenses since it requires less labour overall. Yet it is more expensive to maintain and has higher beginning expenditures.
Size of mechanical bar screens
The opening sizes of mechanically cleaned bar screens range from 0.25 to 1.5 inches. Since, workers don't have to sweep the trash, the bars can be steeper at 0 to 30 degrees.
The main device in newly constructed facilities is typically a mechanical screen cleaning system. They have more benefits than drawbacks.
Types of Mechanical Screens
1. Chain-driven screens employ screens for cleaning. Depending on whether the water is flowing in an upstream or downstream direction, the rake can go up or down.
2. There is only one rake in the reciprocating rake system (also known as climber screens). The trash is removed from the top by the rake, which ascends to the base. This type may have disadvantages in heavy screening applications, because it only has one rake.
3. A rake is present on a catenary screen and is placed up against the bars. To place the trash in a chamber, the rakes move higher.
4. The continuous belt screen comes next. There are many rakes on a continuous screen.
Bar screens play a key function as the initial or preliminary step in the sewage treatment process. They must perform well for the other machinery to function properly. As a result, your facility needs the appropriate wastewater treatment bar screen.
How can we assist?
Netsol Water is passionate about increasing the productivity, efficiency, and profitability of sewage treatment plants.
You must take a number of elements into account, including the amount of wastewater, while design and manufacture of STPs. Call us right away, and we'll be happy to assist you. Contact us at +91 9650608473 or firstname.lastname@example.org for expert advice.