What Is a Drum Filter?
A drum filter is a rotating drum-shaped filtration device designed to remove particulate matter and other targets from various substances. Filters can remove particles ranging from 5 to 1,000 micrometers, utilizing materials from polyester and other synthetic fibers to stainless steel. The rotation helps prevent clogging and facilitates easy maintenance through cleaning and filter replacement.
Uses of Drum Filters
Drum filters are deployed across numerous sectors, including chemical, food, metal, water treatment, and sewage management. Their adaptability is enhanced by changing the pore size of the filter, catering to a broad spectrum of filtration needs. These filters are preferred for their cost-effectiveness, low maintenance requirements, and compact design, contributing to space efficiency and ease of cleaning.
Features of Drum Filters
Known for their simplicity, efficiency, and maintenance ease, drum filters are straightforward to install. While filters may clog over time, necessitating regular cleaning and occasional replacement, many models automate the cleaning process, with manual replacement remaining relatively simple.
How to Select a Drum Filter
- Purpose of Use: Clarify the filtration goal, such as purifying liquids, separating solids, or treating wastewater, to choose a filter that meets all necessary criteria.
- Processing Material and Particle Size: Account for the liquid’s viscosity and chemical properties, selecting a filter that can handle corrosive substances or high temperatures and matches the particle size required for effective separation.
- Drum Filter Size, Shape, Rotation Speed, and Filter Cell Arrangement: Consider how these factors influence throughput and efficiency, ensuring the chosen filter matches process requirements and maintenance needs.
- Performance and Cost: Evaluate options to find the best balance between budget and performance, considering regulatory and safety requirements for the specific application.
Other Information on Drum Filters
Cake Layer Removal Method
The accumulated material, or cake layer, in drum filters can be removed in several ways, depending on its consistency:
- Scraper Discharge Method: Uses compressed air and a scraper to remove non-sticky materials from the filter.
- Roller Discharge Method: Employs a roller for sticky materials, with a scraper to remove the material adsorbed by the roller.
- Precoat Cutting Method: Involves scraping off the cake layer under vacuum conditions, suitable for uniformly sized particles, preventing filtrate backflow, but not applicable for varying particle sizes.