DEVELOPMENT OF MODERNIZED PAPER FILTERING MATERIALS FOR WATER PURIFICATION, ASSESSMENT OF THEIR PROPERTIES

Filtering paper materials (FPM), which are easy to recycle, are widely applied to water purification. The main disadvantage of the absolute majority of filtering materials, including paper, is their tendency to biofouling. This drawback considerably limits or even sometimes makes it impossible to use filtering materials and/or sorbents in a certain medium. In connection with the above, the object of our study was the process of water purification using the FPM with disinfecting properties based on modified cellulose fibers and natural sorbent palygorskite, which can adsorb mechanical impurities, heavy metal ions, entero-viruses, and bacteria. It was found that the samples of modified filtering paper materials with the highest density and lowest thickness and the samples with the lowest density and the highest thickness have higher filtration and sorption capacity compared to samples with the mean values of these technological characteristics. Swelling of cellulose fibers reduces the impact of the compositional structure of the studied FPM samples on their filtering capability and increases the impact of the compositional structure on the sorption ability of these FPM. It was established that the samples with the introduction of about 40 % phosphoric ester of cellulose into their composition have the best technological characteristics. The character of dependence of the rate of filtration process on consumption of purified water, thickness, density and composition of FPM was established. The obtained mathematical models are presented by second-order polynomial and make it possible to take into consideration not only technical specifications, but also the impact of the FPM composition on the rate of filtration process of purified water. Among the studied parameters, the content of sulfate viscose or sulfate bleached viscose in paper-forming mass of the studied samples and consumption of the purified water have the highest impact on the rate of the filtration process at constant pressure and contamination concentration. The proposed mathematical models also allow to determine the necessary compositional structure for obtaining FPM with determined propertie