ECONOMIC AND ENVIRONMENTAL BENEFITS OF NACL BRINE REUSE BY NEW MEMBRANE TECHNOLOGY
Received 23 April 2019
Accepted 18 May 2019
Print 24 June 2019
Cation exchange water softening is one of the most widely used technologies of water treatment. However, its environmental impact related to discharge of highly concentrated regeneration brine draws more attention as overall quality and availability of water resources decreases. Bearing in mind high levels of reusable NaCl in brine discharge, technology that will reduce the environmental impact and help reuse brine is required. To develop such technology composition of spent brine solution from Na-cation exchanger was investigated and conditioning of such solution with use of nanofiltration membranes of different types under different temperatures, pressures and recovery values was tested. Results show that optimal conditions for NaCl recovery include usage of Dow Filmtec Fortilife XC-N membrane elements at temperature 23–27 °C, pressure of 23–25 bar and recovery of 55–60%. Under these conditions purity of NaCl in permeate over 90% and NaCl yield of 13,1 kg/h were achieved. Principal technological scheme of the process of membrane conditioning of the spent regeneration solution was proposed that allows achieving reduction of NaCl consumption by 40% and reduction of NaCl discharge into sewage by 72% with corresponding economic and environmental benefits.
World salt production from 1975 to 2017 (in million metric tons). https://www.statista.com/statistics/ 237162/worldwide-salt-production.
Regeneration methods for ion exchange units. http://dardel.info/IX/processes/regeneration.html.
Wachinski, A.M. Environmental Ion Exchange: Principles and Design; Crc Press, 2016.
Grasso, D.; Strevett, K.; Pesari, H. IMPACT OF SODIUM AND POTASSIUM ON ENVIRONMENTAL SYSTEMS. Journal of Environmental Systems 1994.
Tyler, E.J.; Converse, J.C. Soil acceptance of onsite wastewater as affected by soil morphology and wastewater quality. Proceedings of the 7th National Symposium on Individual and Small Community Sewage Systems. Atlanta, GA, 1994, pp. 185–194.
Kinsley, C.; Crolla, A.; Joy, D. Impact of Water Softeners on Septic Tanks: Field Evaluation Study; Canada Housing and Mortgage Corporation, 2006.
Woodie, M. THE BATTLE OVER BRINE. https://www.watertechonline.com/the-battle-over-brine/.
Rak, S.F.; Brigano, F.A.; Soucie, W.J. Reclaiming of spent brine, 1993.
Flow. A publication about cost-effective demineralization with the DOWEXTM UPCORETM packed bed system from Dow Water Solutions. http://msdssearch.dow.com/PublishedLiteratureDOWCOM/dh_ 00bb/0901b803800bbc0c.pdf?filepath=liquidseps/pdfs/noreg/177-01527.pdf&fromPage=GetDoc.
Legislation of Ukraine. The procedure for determining the size of the charge for over-discharge wastewater to centralized drainage systems. https://zakon.rada.gov.ua/laws/show/en/z0057-18#n2, 2017.
Copyright (c) 2020 Yevhen Orestov, Tetiana Mitchenko, Nataliia Turcheniuk
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