Resource-saving water treatment methods in the current systems

Development of closed water-rotation systems with the replacement of natural water by the enterprises waste water is one of the most effective technological methods of rational use of natural water resources. The influence of impurity cations (iron, aluminum, copper and additional magnesium) in the individual state and in the mixture on the process of formation of calcium carbonates has been studied. To inhibit the formation of calcium carbonate in the laboratory, the effect of carboxyl-containing water-soluble polymers - sodium polyacrylate with MM 5100, sodium polymethacrylate with MM 4000, a copolymer of acrylic and maleic acid with MM 3000 in the individual state was studied. The research was carried out on model systems. It is shown on model systems, that presence of iron, aluminum, copper salts in the waste water initiates calcium carbonate formation and decrease in the induction period of precipitation by 1.2–1.4 times. Thus, using of high efficiency inhibitory reagents is necessary in closed water circulation systems. It was determined, that carboxyl-containing water-soluble polymers (molecular weight from 3000 to 5000) addition increases in induction period of precipitation: by 2.7 times with using of sodium polyacrylate, by 2.4 times with using of sodium polymethacrylate and by 1.9 times with using of copolymer of acrylic and maleic acid. On the basis of the results obtained,it was concluded, that it is useful to apply water-soluble polymers as precipitation inhibitors in closed water circulation systems of enterprises with complex composition waste water.

water resources, water circulation systems, treated wastewater, crystallization, methods of water treatment, inhibitors, sedimentation

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