№6|2017

WATER TREATMENT

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UDC 628.165

Pervov A. G., Andrianov A. P., Efremov R. V., Spitsov D. V.

Utilization of reverse osmosis concentrate with removing from it calcium and magnesium ions

Summary

The possible use of pre-developed technology of removing calcium carbonate with seeding agent to reduce the consumption of concentrate from large-scale units operating at the heat power facilities was studied. Concentrate of the operating reverse osmosis units contains inhibitors that inhibit the rate of seed crystal growth and impede the process of its utilization. The correlations between the calcium carbonate growth rate in the concentrate containing inhibiting substances and the dosage of the introduced seed, pH value and permeate yield were studied. For the implementation of the technology membrane apparatus with open channels are used that are resistant to the impact of membrane transfer of low-soluble salt deposits and suspended substances on the process. The developed by the authors technology of the concentrate utilization from reverse osmosis units installed at the heat power facilities for boiler feed water preparation is described. With the help of the developed technology softened water with lowered alkalinity and salt content can be produced. Herewith no chemicals are needed, and the unit does not consume water for its own needs. The technology provides for the complete utilization of reverse osmosis concentrate by improving its quality (in terms of hardness, alkalinity and total dissolved so­lids) to the requirements that allow using it for engineering purposes (for adding into a heat supply system or a circulation water supply system). Herewith any saline discharges into the environment are eliminated.

Key words

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REFERENCES

  1. Pervov A. G., Andrianov A. P., Gorbunova T. P., Spitsov D. V., Iurchevskii E. B. [Removing calcium carbo­nate from reverse osmosis concentrate by crystallization with seeding agent]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2014, no. 5, pp. 29–38. (In Russian).
  2. Pervov A. G., Andrianov A. P., Efremov R. V., Rudakova G. Ia. [Study of the efficiency of new types of inhibitors for preventing the formation of carbonate deposits in reverse osmosis units and determination of their technical characteristics]. Book of reports of «Advanced methods of water purification and equipment protection from corrosion and scale formation» VI Scientific and Practical Conference. October 28–29, 2015, Moscow, p. 42. (In Russian).
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  9. Pervov A. G., Andrianov A. P., Iurchevskii E. B. [Improvement of membrane apparatus design]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2009, no. 7, pp. 62–68. (In Russian).
  10. Pervov A. G., Rudakova G. Ia., Efremov R. V. [Developing software for process calculation of reverse osmosis and nanofiltration systems with the use of «Aminate» chemicals]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2009, no. 7, pp. 21–28. (In Russian).
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  12. Pervov A. G., Andrianov A. P., Gorbunova T. P., Iurchevskii E. B. [The technology of reverse osmosis concentrate disposal in water treatment systems]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2012, no. 8, pp. 20–26. (In Russian).
  13. Pervov A. G., Efremov R. V., Spitsov D. V., Andrianov A. P., Gorbunova T. P. [Membrane methods in drinking water supply: membrane selection, water quality prediction, concentrate utilization]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2013, no. 6, pp. 15–21. (In Russian).

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