Abstract
This paper presents a mathematical modeling for a series of experiments in which humic acid (AH) and calcium chloride (CaCl2) were used, in order to visualize the amount of contaminant before and after the nanofiltration (NF) process, using Excitation Emission Matrix Spectroscopy (EEMS). It allows to a better understanding of membrane fouling. The membrane used for these experiments was a NF ceramic membrane made of titanium dioxide (TiO2). For the experimental determinations, a constant amount of 10 mg/L HA and different amounts of CaCl2, respectively 1, 2, 3 and 4 mmol/L were used, considering the working methodology presented in this article. The presence of the amount of contaminant in water was determined using the EEMS method using the FP-8300 Spectrophotometer, after which a spectral analysis was performed. TableCurve 3D software was used to make the mathematical models in order to ensure that the equations obtained had the same shape. The values of the correlation coefficients, corresponding to the generated equations, have values ranging from 0.91 to 0.93. In order to verify the mathematical models thus obtained, graphs of the difference between the surface obtained with the help of the mathematical models and the surface obtained by means of real data were drawn. In conclusion, it turns out that, the largest difference was obtained in the case of samples taken from the feed, with a maximum difference of 31 fluorescence intensity arbitrary units (a.u.), and for the samples taken from the permeate the deference is 14 fluorescence intensity a.u.
Highlights
Drinking water from different sources, usually, do not correspond in terms of quality parameters and so they must be subjected to treatments by applying increasingly treatment methods and modern techniques
The mathematical models were designed for the two sets of samples, both for the ones taken from the feed of the Nano filtration (NF) plant and for those obtained after the NF process, respectively from the permeate [1]
The experimental researches that aimed to identify the methods of decontamination of wastewater, presented in this paper, aimed to extend as widely as possible this modern process of water filtration, respectively by using the process of filtering through nanofiltration membranes (NF) to help improve the quality of filtered water
Summary
Drinking water from different sources, usually, do not correspond in terms of quality parameters (according to the legislation in force) and so they must be subjected to treatments by applying increasingly treatment methods and modern techniques. The study on the specialized references indicates that the filtration process is being increasingly used in order to produce water for different requirements [16,17,18,19,20,21,22]. Nano filtration (NF) is one of the most used water filtration technologies By applying this process, the heterogeneous mixture of solution subjected to filtration, is separated into two phases/components, respectively a concentrated (brine) residual flow and a permeate (filtered) flow, which passes through.
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