What is mechanical bar screen?
A bar screen is a mechanical filter used to remove large objects, such as rags and plastics, from wastewater. It is part of the primary filtration flow and typically is the first, or preliminary, level of filtration, being installed at the influent to a wastewater treatment plant.
What is grit removal?
Grit removal is the process used to remove sand, silt and grit from water. Grit removal can also be used to remove sand from river water intakes prior to processing for potable water, use in industrial applications to remove fine abrasives, as well as being used to remove grit entrained in sludge.
How do you clean a bar screen?
The bar screens are cleaned by scrapers and rakes driven by an endless chain system that lifts the waste up the entire bar screen rack and flap and then drops back to a position away from the bar screen rack. A powered waste removal system is often used to clear the top section.
What is coarse screen?
Coarse screens remove large solids, rags, and debris from wastewater, and typically have openings of 6 mm (0.25 in) or larger. Types of coarse screens include mechanically and manually cleaned bar screens, including trash racks.
Where does the waste from the pretreatment go?
Waste Water Treatment Process The pretreatment removes all trash and debris from the sewage water through a bar screen. Here common items such as rags, sanitary napkins or sticks are collected and sent to a landfill. The water then passes through a grit chamber to collect sand, dirt and other inorganic solids.
What is the opening of fine screens in MM?
Explanation: Fine screens have openings of less than 0.25 in. and are used to remove solids smaller than those retained on bar racks. They are used primarily in water or wastewater containing little or no coarse solids.
What are the 3 types of grit chambers?
There are three general types of grit chambers: horizontal-flow, aerated, or vortex chambers. All of these designs allow heavy grit particles to settle out, while lighter, principally organic particles remain in suspension.
What happens anoxic tank?
Anoxic Mixers are used in de-nitrification basins in waste water treatment plants. This breakdown of nitrate from the waste stream releases oxygen and nitrogen gas. The oxygen is consumed by the bacteria and the nitrogen gas releases to the atmosphere.
Why choose our wastewater mechanical bar screens?
The simplicity of their design allows great adaptability, allowing our wastewater mechanical bar screen to be installed in both channels and stations, without any modification of the civil works. Our unique Gravity-based Bar Screening System is used by all our Bar Screens, no matter their width or depth.
What is a bar screen monster®?
The highly efficient Bar Screen Monster® is specifically designed to quickly and efficiently remove large slugs of debris coming down the channel. This heavy duty screen uses a reciprocating rake to clean the mechanical bar screen and pull out debris in headworks and pump stations.
How do the bar screens work?
The geared-motor runs backward, the polyester strap tightens, the grapple rake closes its teeth on the screen and goes up. All our Bar Screens are driven by a single Polyester Strap. The straps are 100% made of polyester, a material with a high tensile strength, and great resistant to wear, pulling, UV, rubbing and humidity.
What is a static bar screen?
Static Bar Screen – basic solution to withstand & filter water. A coarse bar screen can be subject to enormous forces and is therefore calculated for your project application. The design is simple, robust and functional with a maximum cleaning result. The Hubert static Bar screen can be provided with raking systems to remove debris.