Active regeneration

Cleaning

The Bloom absolute filter's construction and design incorporating spheres permits the filter cake to be easily cleaned and removed from the system at short notice. During active regeneration, the filter is flushed for a few seconds against the direction of filtration by means of compressed air, filtrate, another gas or water vapour. This enables concentrated discharge of the separated particles and subsequent refinement if necessary. Valuable solids can thus be recycled.

Pressurized or vacuum system

The absolute Bloom filter can be used both in pressurized and vacuum systems:

Pressurized system

As part of a pressurized system, the Bloom absolute filter is situated in our specially designed filter housing. The pump is located upstream from the filter. One advantage of a pressurized system is the ability to achieve higher volumetric flow rates. One possible application here is conditioning of ballast water.

Vacuum system

As part of a vacuum system, the Bloom absolute filter can be withdrawn directly from the fluid to the filtered. The pump is located downstream from the filter. The advantage of the vacuum method is that the solids remain at the source. Consequently, this method is ideal for filtration of surface water, as it eliminates the need for conditioning and disposal of dirt particles.

The pressurized system achieves higher volumetric flow rates than the vacuum system. Possible applications here include ballast water treatment. The advantage of the vacuum method is that the particles remain at the source. Consequently, this method is ideal for filtration of surface water, eliminating the need for conditioning and disposal of the particles remaining in the water.

Active regeneration can be triggered via:

  • Differential time ∆t
  • Differential pressure ∆p
  • Differential volume ∆V

Continuous filtrate flow can be guaranteed by a redundant Bloom absolute filter.

Taking place at high pressure and high volumetric flow, backwashing only needs to be brief and requires a small amount of rinsing agent. The detached particles may be fairly large, so that they settle readily and can be removed easily. This facilitates quick and efficient backwashing, reduces cleaning effort and lengthens the filter's expected service life.

(Prof. Dr. Gerhard Hammel, Mechanical Process Engineering + Plant Planning, Bingen Technical University, 2009)