Rotary Vacuum Filters
An Auto-Vac® utilizes a liquid ring vacuum pump that pulls water through a precoat drum filter while sucking moisture out of the suspended solids. The inside of the drum is hollow; the outside consists of a wedge wire screen covered by a polypropylene cloth. The drum rotates in a trough [filter pan] where one-third is submerged in liquid and two-thirds are exposed to ambient air. When activated, and before filtration, the drum surface is coated with a filter aid 'cake' of Diatomaceous Earth (DE) or Perlite. This consumable filter media is porous, allowing air and water to pass through while capturing micron size particles.
Once a full cake is built on the drum, the wastewater is pumped into the pan at a controlled rate. The vacuum sucks the water [liquid] through the drum and pumps it away. Suspended solids, precipitated metals, or de-emulsified fat, oil and grease larger than one-micron will accumulate on the filter cake surface. These solids will build with each revolution of the drum until the vacuum cannot draw any more water through. At this point, a stepping motor activates a variable speed knife blade that removes the top layer of solids with lathe-like precision. The knife also shaves off a slight amount of filter aid cake as it advances toward the drum; leaving a clean layer of media to grab more solids.
The drum size, filtration rate, dryness of solids and filter aid consumption varies with the characteristics of the incoming liquid. Example research paperms. schrolls ela classes. Contact ALAR to help determine the Auto-Vac® that best suits your application.
Rotary Vacuum Filter Application
Rotary Vacuum Filters
An Auto-Vac® utilizes a liquid ring vacuum pump that pulls water through a precoat drum filter while sucking moisture out of the suspended solids. The inside of the drum is hollow; the outside consists of a wedge wire screen covered by a polypropylene cloth. The drum rotates in a trough [filter pan] where one-third is submerged in liquid and two-thirds are exposed to ambient air. When activated, and before filtration, the drum surface is coated with a filter aid 'cake' of Diatomaceous Earth (DE) or Perlite. This consumable filter media is porous, allowing air and water to pass through while capturing micron size particles.
Once a full cake is built on the drum, the wastewater is pumped into the pan at a controlled rate. The vacuum sucks the water [liquid] through the drum and pumps it away. Suspended solids, precipitated metals, or de-emulsified fat, oil and grease larger than one-micron will accumulate on the filter cake surface. These solids will build with each revolution of the drum until the vacuum cannot draw any more water through. At this point, a stepping motor activates a variable speed knife blade that removes the top layer of solids with lathe-like precision. The knife also shaves off a slight amount of filter aid cake as it advances toward the drum; leaving a clean layer of media to grab more solids.
The drum size, filtration rate, dryness of solids and filter aid consumption varies with the characteristics of the incoming liquid. Example research paperms. schrolls ela classes. Contact ALAR to help determine the Auto-Vac® that best suits your application.
Rotary Vacuum Filter Application
Rotary Vacuum Filter Maintenance
The Auto-Vac® Rotary Vacuum Drum Precoat Filter (RVDF) is ALAR's flagship dewatering technology. The Auto-Vac® microfiltration design handles a wide range of volumes with various solids loadings. Problem solving techniques and strategies. Its self-cleaning feature maintains consistent filtration rates without clogging, blinding or bottlenecks. The high-capacity YU rotary filter, formerly the Bird Young rotary filter, is the high-end solution for rotary vacuum drum filters. The YU filter is best suited for free-filtering materials, where it can benefit from the much higher filtration rates. Its unique, single-cell design. Rotary Vacuum Drum Filters EIMCO-K.C.P. Continuous vacuum drum filters are designed to handle the broadest range of slurries of any filter. This permit drum filters to be used in a variety of applications. 1.1 ROTARY VACUUM DRUM FILTERS The Rotary Vacuum Drum Filter belongs to the bottom feed group and is one of the oldest filters applied to the chemical process industry. Therefore rotary vacuum drum filters are certainly used in to the best part of solid liquid separation process. The Figure 1, shows the basic structure of the rotary vacuum drum. Trevor Sparks, George Chase, in Filters and Filtration Handbook (Sixth Edition), 2016. Microsoft word grading rubric template download free. 4.4.2.2 Rotary vacuum disc filter. The vacuum disc filter operates a similar way to the vacuum drum filter – filtration elements (sectors), covered in a filter cloth, pass into a slurry trough, vacuum is applied to the sector, a cake forms on its surface, it emerges from the slurry and the cake is dried.
