Filtration capacity and particle analysis

Analysis by means of a photo-optical meter

The following pictures and documentation (see the relevant documents in the right-hand column) illustrate the Bloom filter's capacity. The samples were analyzed with a "XPT-C Particle Analyzer" photo-optical meter which measures the particles' area-equivalent diameter in microns. The samples pass via a hose pump through the measurement cell and are evaluated photo-optically. The number of images is used to determine the measurement volume. 831 images correspond to a sample volume of 0.1 ml.

Analysis of raw water

By extrapolation, the analyzed samples contained approximately 270 million spherical particles per litre of raw water with a size distribution of 0 to 40 microns.

A total of 27,420 particles were measured in the raw water sample at a measuring volume of 0.1 ml. The left-hand diagram of each measurement record indicates the distribution of the particles by size in the filtrate, while the right-hand diagram indicates the particle count.

Diagrams of raw water analysis

Diagrams of raw water analysis

In addition to the measurement records, photos of the raw water analysis are provided in the two illustrations at the top (picture 2 of 831). The original sample photo is shown on the left, a processed photo of the particle counter on the right. Each individual particle is shown in a different colour.

Filtrate analysis

The second analysis relates to the filtrate which was separated with a 12 µm Bloom filter. The sample was taken directly after active regeneration of the filter. The filtrate sample now contains a total of 43 particles. The largest particle in the filtrate has a diameter of 11 microns. The separation limit of 12 microns results in a separation rate of 100% during absolute filtration. Based on the particle count of 27,420 in the raw water, the total deposition rate is 99.85%.

Images of filtrate analysis

Images of filtrate analysis

Here again is the second picture (of 831 photos). The original photo of the measurement analysis is shown on the left, the processed photo on the right. No particles are visible.