Influence of the Measurement Resolution on the Filtration Analysis: An Improved Test Setup According to VDI 2762 Guideline

Abstract

Specific parameters of cake filtration, such as the filter cake and filter medium resistances, can be determined using the pressurized housing cell standardized in the guideline VDI 2762 by measuring the filtrate mass on a laboratory scale. For reproducible measurements and an exact detection of the filtration start, an improved test setup is presented and compared with a standard setup according to the guideline VDI 2762. On the basis of measurements without and with a particle system to be filtered, it is shown that the characteristic nonlinear course at the beginning of each filtration, which can be seen in the t/V-V diagram, is influenced by the used measuring equipment.

Membrane–Fabric Composite Filter Media for Continuous Cake Filtration without Gas Throughput Using Paste Dot Coating with Adhesive

“…In order to determine the influence of the surface coverage, as well as the associated pore blockage caused by the adhesive dots on the filter medium resistance, flow-through tests were carried out with the pressurized filter cell according to VDI 2762 with 250 mL demineralized (DI) water at a differential pressure of 0.8 bar [ 29 ]. To ensure an accurate determination, the improved experimental setup with respect to the measurement resolution developed at the institute was used [ 30 ]. The schematic structure of the improved pressurized filter cell is shown in Figure 5 .…”

“…The balance (WIPOTEC EC3000) also offers an increased resolution of 0.02 g at time intervals of 10 ms. The effects of the resolution improvement on the filtration results, as well as a detailed description of the measurement setup can be taken from the published paper [ 30 ]. During the measurement the filtrate mass is recorded, converted into volume over time , and plotted in a - diagram.…”

Monitoring of Particulate Fouling Potential of Feed Water with Spectroscopic Measurements

“…The MFI is commonly used to express the rate of cake formation on a membrane surface, which partially describes the flux decrease in an RO process. It is derived from filter Equation (1) and determined under the assumption that particular fouling occurs in the three stages of pore blocking, cake filtration, and cake compression [ 17 , 18 ]. where t is time, V is the filtrate volume, η is the water viscosity, R fm is the clean membrane resistance, is the transmembrane pressure, A is the membrane area, α is the specific filter cake resistance, C b is a concentration constant (mass of the dried filter cake divided by the filtrate volume) in kg/m 3 , and I is the fouling index in Equation (2).…”

“…The MFI is commonly used to express the rate of cake formation on a membrane surface, which partially describes the flux decrease in an RO process. It is derived from filter Equation (1) and determined under the assumption that particular fouling occurs in the three stages of pore blocking, cake filtration, and cake compression [17,18].…”