The role of bar screens in a water treatment plant
Visit water treatment plants play an essential role in preserving the environment by treating wastewater before it is discharged into the natural environment. Among the key equipment in these plants, bar screens play a fundamental role in the first stage of treatment.
What is a wastewater treatment plant?
A wastewater treatment plant is an infrastructure designed to clean wastewater from human activities (domestic, industrial, agricultural) before reintroducing it into the natural cycle. It generally follows several stages:
- Pretreatment : Disposal of larger items of waste.
- Primary treatment Suspended solids settling.
- Secondary treatment Biological degradation of organic pollutants.
- Tertiary treatment Nutrient removal, disinfection or refining.
Screening, part of pretreatment, is a treatment plant's first line of defense.
Why is screening essential?
When it arrives at a wastewater treatment plant, wastewater contains a wide variety of solid waste: plastics, textiles, wood and other unwanted objects. These solids can :
- Damage downstream equipment such as pumps or decanters.
- Reduce the effectiveness of other treatment steps.
- Increase maintenance costs.
The role of the bar screens is to retain this waste as soon as it arrives in the treatment plant, thus ensuring optimal, long-lasting operation of the plant.
How do bar screens work in a wastewater treatment plant?
Bar screens, often called Automatic Bar ScreensThey take the form of grids or sieves that filter wastewater. Here's how they typically work:
- Solids collection Water passes through a grid whose bars capture waste.
- Automatic extraction A mechanical system regularly removes accumulated waste to prevent clogging.
- Waste disposal Solids are transported to a skip or compactor for disposal.
Thanks to this automation, the bar screens guarantee continuous operation, even under high flow conditions.
Advantages of bar screens for wastewater treatment plants
- Equipment protection Prevents premature wear and tear on pumps and treatment systems.
- Increased efficiency Reduces downtime due to clogging or breakdowns.
- Durability : Helps extend the service life of all installations.
- Cost optimization : Reduces maintenance costs and improves productivity.
Why choose FB Procédés for your wastewater treatment plant?
At FB ProcédésWe specialize in the design and manufacture of bar screens for wastewater treatment plants. Our solutions include :
- Made to measure : Adapted to your technical constraints.
- Robust and reliable Made of stainless steel for maximum strength.
- Innovative : Incorporate the latest technological advances.
We're with you every step of the way, from assessing your needs to installing and maintaining your equipment.
Case studies of bar screens in wastewater treatment plants
Two automatic bar screens PROSTEP type6mm air gap, installed in overhead concrete channels and fed by pumping. Each line can process up to 145m3/h. Screening rejects are evacuated via a VCP200 screw compactor and a stainless steel downspout to the first floor, where they are stored in a skip. All the equipment is protected against frost, and is also fitted with a "safety pack" for the protection of operating personnel.
Two automatic bar screens type NG11These bar screens, with a 20mm air gap and a unit width of 1400mmm, are designed to treat up to 4000m3/h. The difference in width between the bar screens and the manhole is compensated for by the provision of side deflectors and a central bow between the 2 bar screens. The latter are installed on a walkway (L5200xl2500mm, with staircase, guardrail and cover), and combined with a VTP250 conveying screw and a VCP250 compacting screw, enabling screenings to be discharged into a skip placed close to the manhole. A "design, manufacture & installation" 100% FB Procédés.
An automatic bar screen type SI3506mm air gap, combined with a VCP150 type compaction screw, and installed in a FB Procédés-designed metal casing that also includes a bypass channel, equipped with a manual grate and waste basket. This unit can absorb up to 50m3/h (for municipalities with up to 2,500 inhabitants).