Spectrometric characterization of suspension liquid and light extinction model update

Liu, Sheng; Shen, Yang; Gao, Zihui; Gao, Hong‐Wen

doi:10.1016/j.saa.2023.122690

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…Equation (6) links

to the calculated extinction coefficient

and the particle cross-section area

. Substituting Equation (6) into Equation (5) reveals the relationship of the measured extinction ratio of light beams

with wavelengths i and j and the ratio of their extinction coefficients

, as shown in the following equation [ 28 , 29 , 30 ]:

…”

Section: Modelsmentioning

confidence: 99%

Monitoring of Particulate Fouling Potential of Feed Water with Spectroscopic Measurements

Weirich

Antonyuk

2023

Membranes

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The modified fouling index (MFI) is a crucial characteristic for assessing the fouling potential of reverse osmosis (RO) feed water. Although the MFI is widely used, the estimation time required for filtration and data evaluation is still relatively long. In this study, the relationship between the MFI and instantaneous spectroscopic extinction measurements was investigated. Since both measurements show a linear correlation with particle concentration, it was assumed that a change in the MFI can be detected by monitoring the optical density of the feed water. To prove this assumption, a test bench for a simultaneous measurement of the MFI and optical extinction was designed. Silica monospheres with sizes of 120 nm and 400 nm and mixtures of both fractions were added to purified tap water as model foulants. MFI filtration tests were performed with a standard 0.45 µm PES membrane, and a 0.1 µm PP membrane. Extinction measurements were carried out with a newly designed flow cell inside a UV–VIS spectrometer to get online information on the particle properties of the feed water, such as the particle concentration and mean particle size. The measurement results show that the extinction ratio of different light wavelengths, which should remain constant for a particulate system, independent of the number of particles, only persisted at higher particle concentrations. Nevertheless, a good correlation between extinction and MFI for different particle concentrations with restrictions towards the ratio of particle and pore size of the test membrane was found. These findings can be used for new sensory process monitoring systems, if the deficiencies can be overcome.

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