An investigation carried out in 11 dairies in Serbia has shows that 78.75 % of whey, a by-product of cheese industry, is emitted into river systems, thus contributing to the organic pollution of the environment. This pollution can be avoided by processing of whey into food and pharmaceuticals. It is shown that low-temperature regime of whey concentration and fractionation, based on vacuum concentration and diafiltration, preserves whey proteins undenaturated, as proved by differential scanning calorimetry method. Functional native whey proteins based food products, with potentially high immunomodulatory activity, are obtained.
The influence of grinding white sepiolites from the Magure-Golesh mine in Southern Serbia on their structure and on the rheological characteristics of their aqueous suspensions was investigated. Sepiolite samples of hard and soft consistency were ground in three different types of mills: a ball mill air-stream mill, and a colloid mill. The effect of grinding on the sepiolite samples was investigated by SEM, XRD, IR, TG and BET methods and by chemical analysis. Grinding generally resulted in the separation of the sepiolite fibers, and partial amorphization. In addition, grinding produced substantial changes in the apparent viscosity and rheological characteristics of dilute aqueous suspensions of sepiolite. It is concluded that the viscosities are especially affected by the type of grinding employed.
Paper laboratory-produced from sepiolite, Goles-Serbia was studied to
determine its sorption characteristics for nitric oxides, water vapor, and
ammonia. The paper adsorbed high percentages of nitric oxides and ammonia
was stoichiometrically chemisorbed on paper saturated with NO2 and H2O.
Infrared spectroscopy showed that the sorption of nitric oxides and ammonia
does not destroy the crystal lattice of sepiolite, which was confirmed by
XRD-analysis. Sorption of both nitric oxides and ammonia occurred by
zeolitic water inside the structural channels of sepiolite. Pressure swing
adsorption (PSA) or temperature swing adsorption (TSA) cycles can be
repeated many times, in the case of NOx and NH3.
The paper presents the phases in the research of sepiolite - hydrated in fibrous magnesium silicate, and in the development of different products based on sepiolite, at the Institute of General and Physical Chemistry (IGPC). Also, a review on sepiolite world deposits, general properties and practical uses is given in the paper. An the IGPC sepiolite from the mine Golesh was investigated, concerning its uses in paints, as a pigment and rheological aditive; in the rubber industry, as an active filler; in sepiolite, papers, for purifying, waste gases in industry and homes and as a powder combined with sepiolite paper, to purify old transformer oils. It was concluded that a number of technologies based on sepiolite could be developed in small or medium industrial enterprises, which are of the strategic interest for Serbia, especially since domestic sepiolite deposites can be further developed and that some of these technologies are important in environment all protection
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