Waste water recycling by ion-exchange: I. Complete desalination |
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| Authors: | Y Egozy E Korngold NC Daltrophe M Rebhun |
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| Affiliation: | Research and Development Authority, Ben-Gurion University of the Negev, Beer-Sheva Israel;Department of Environmental Engineering, Technion—Israel Institute of Technology, Haifa Israel |
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| Abstract: | Recycling of waste water by ion-exchange was studied on a bench scale. Secondary municipal effluent, which had undergone lime flocculation, served as a feed for the ion-exchange system. It was found that both the salt concentration and the organic matter content of the effluent could be reduced to produce high quality water, suitable for a wide range of agricultural and industrial applications. Salt concentrations was reduced from 15 meq/l (750 ppm as CaCO3) to about 1 meq/l (50 ppm as CaCO3) and the organic matter, from 70–100 mg/l COD (chemical oxygen demand) to 20 mg/l. The anion exchanger was regenerated with Ca(OH)2 according to a new method recently developed. The treatment cost for a 2000 m3/day plant was calculated to be 18.0 ¢/m3. |
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