Chemistry:Bar screen
A bar screen is a mechanical filter used to remove large objects, such as rags and plastics, from wastewater.[1] 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. They typically consist of a series of vertical steel bars spaced between 1 and 3 inches apart.[2]
Bar screens come in many designs. Some employ automatic cleaning mechanisms using electric motors and chains, some must be cleaned manually by means of a heavy rake. Items removed from the influent are called screenings and are collected in dumpsters and disposed of in landfills.[1] As a bar screen collects objects, the water level will rise, and so they must be cleared regularly to prevent overflow.[3]
References
- ↑ 1.0 1.1 Streicher, Dennis. "Waste Water Treatment Plant Elmhurst, Illinois A Virtual Tour". Elmhurst College. Archived from the original on 29 March 2012. https://web.archive.org/web/20120329042614/http://www.elmhurst.edu/~chm/vchembook/310wastewater.html. Retrieved 18 February 2012.
- ↑ Spellman, Frank R. (2010). Spellman's Standard Handbook for Wastewater Operators, Volume 3. CRC Press. ISBN 978-1439818886. https://books.google.com/books?id=I1L4tV5wneAC&q=bar+screen&pg=PA85.
- ↑ Ragsdale, Fred. Wastewater System Operators Manual. Ragsdale and Associates Training Specialists, LLC. http://www.ragsdaleandassociates.com/WastewaterSystemOperatorsManual/Chapter%202%20-%20Pretreatment.pdf. Retrieved 2012-02-18.
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