Use of Calcium and Magnesium Salts for Wastewater Treat-ment of Textile Enterprises


E.V. Alekseev,A.P. Svintsov,S.L. Shambina,



water softening,wastewater,Ca and Mg salts, sediment formation, purifi-cation,


Wastewater from water softening stations contains a large amount of calcium and magnesium salts. The results of studies aimed at using these waters as natural solutions of calcium and magnesium ions in the processes of reagent purification of other categories of wastewater are presented. The conditions for the formation of sparingly soluble calcium and magnesium compounds during their alkali treatment using potentiometric titration were studied. According to the results of potentiometric titration of solutions of magnesium and calcium salts with alkali, the ranges of the active reaction of the medium are established, corresponding to the formation of pre-cipitates in the form of hydroxides for magnesium and calcium. The potentiometric titration curves have sufficient selectivity for the quantitative evaluation of the com-pounds formed with acceptable accuracy. It is established that the interaction of pollu-tants of real sewage with freshly formed precipitation of calcium and magnesium hy-droxides occurs according to the adsorption mechanism. Data on the sorption proper-ties of calcium and magnesium hydroxide precipitation in relation to pollutants of textile enterprises are presented. The greatest efficiency of water purification is achieved by solid dispersed impurities absorbed by hydroxides at the time of structure formation and by dyes. The extraction of hydrocarbons, such as petroleum products and surfactants, does not exceed 40%.


I.Adeyemo A.A., Adeoye I.O., Bello O.S. (2017). Adsorption of dyes using different types of clay: a review. Applied Water Science, 7 (2): 543 -568.

II.Ayari F., Srasra E., Trabelsi-Aydi M. (2008). Low-cost adsorbents for a dye uptake from contaminated water modeling of adsorption isotherms: the Langmuir, Freundlich and Elovich models. Surface Engineering and Applied Electrochemistry, 6: 76 -86.

III.Gromoglasov A.A. (1977). Water treatment. Processes and devices. (In Russian). Atomizdat. Russia, Moscow.

IV.Lin J.X., Wang L. (2009). Adsorption of dyes using magnesium hydrox-ide-modified diatomite. Desalination and Water Treatment, 8: 1 -9.

V.Ochkov V.F. (2009). Decrease in water hardness by liming. (In Russian). Water treatment. Water preparation. Water supply., 7: 7-13.

VI.Ramesh T.N., Kirana D.V., Ashwini A., Manasa T.R. (2017). Calcium hydroxide as low cost adsorbent for the effective removal of indigo car-mine dye in water. Journal of Saudi Chemical Society, 21 (2): 165 -171.

VII.Ryabchikov B.E. (2004). Modern methods of preparing water for industri-al and domestic use. (In Russian). DeLiprint. Russia, Moscow.

VIII. Skipton S. and Dvorak B. (2015). Drinking water treatment: water soften-ing (ion exchange). [online] Available at:

IX.Soldatkina L.M, Purich. A.N., Menchuk V.V. (2001). Adsorption of dyes on magnesium hydroxide. (In Russian). Adsorption Science and Technol-ogy, 19 (4): 267 -272.

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