Influence of the Precoat Layer on the Filtration Properties and Regeneration Quality of Backwashing Filters

Abstract

For solid–liquid separation, filter meshes are still used across large areas today, as they offer a cost-effective alternative, for example, compared to membranes. However, particle interaction leads to a continuous blocking of the pores, which lowers the flow rate of the mesh and reduces its lifetime. This can be remedied by filter aids. In precoat filtration, these provide an already fully formed filter cake on the fabric, which acts as a surface and depth filter. This prevents interaction of the particles to be separated with the mesh and thus increases the service life of the mesh. In this work, the influence of a precoat layer with different fibre lengths of cellulose on the filtration behavior is investigated. A satin with a pore size of 11 µm is used as the filter medium. The effects of the precoat layer on the filter media resistance, the filter cake resistance, the turbidity impact, and the regenerability of the fabrics are investigated. This study shows an overview of the suitability of various cellulose fibres based on different aspects as filter aids for particles in ultrafine filtration.

Separation of Microplastic Particles from Sewage Sludge Extracts Using Magnetic Seeded Filtration

“…PET, PP, LDPE and PS particles were prepared through cryo milling as explained in Section 2.2 , and polyvinyl chloride (PVC) particles were purchased in powder form. Pulp fibers (J. Rettenmaier & Söhne GmbH, Germany) commonly used as filter aids were used as surrogate for cellulose Bächle et al. (2021) .…”

Special Issue: Valorization of Material Waste for Environmental, Energetic, and Biomedical Applications

“…Bächle et al [4] also report that for solid-liquid separation, filter meshes are still used across large areas today, as they offer a cost-effective alternative, for example, compared to membranes. However, particle interaction leads to a continuous blocking of the pores, which lowers the flow rate of the mesh and reduces its lifetime.…”

Influence of Particles on the Roller Discharge of Thin‐Film Filtration without Gas Throughput

“…According to Hermeler et al, 50 % of the energy input is due to the acceleration of the liquid [5]. Other methods are flocculation and precoat filtration, both of which use additives (flucculants, cellulose) and thus contam-inate the value product [6][7][8][9]. Cross-flow filtration can be used to filter such particles, but they are only concentrated [10][11][12][13][14].…”