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Cation selective membrane dialysis for ammonia removal from solutions of high salinity
Authors: Pavel Živný1, Martin Roubalík1, Martin Paidar1, Ondřej Škorvan2
| Affiliation: | 1 | University of Chemistry and Technology Prague, Technická 5, 16628 Prague 6, Czech Republic |
| 2 | ASIO Ltd., Research and Development Department, Kšírova 552/45, 619 00 Brno, Czech Republic |
Published in: Ion Exch. Lett. 2018, 11(1-2), 1-14
Permanent link to this page: http://iel.vscht.cz/abstracts/1803-4039-11-0001.htm
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Keywords: cation selective membrane dialysis; ammonia separation; waste water; high salinity
Abstract: Ammonia represents frequent pollutant of water. Therefore various wastewater treatment technologies to remove ammonia are used. The traditional method is based on bacteria that convert ammonia to nitrate and in the second step to nitrogen gas. In several cases biological treatment is not applicable due to high salinity or toxicity of waste water. Thus an alternative method must be applied. Ammonia can be removed or decomposed by several methods such as air-stripping, membrane separation, breakpoint chlorination, and electrochemical oxidation. The danger of undesired organic byproduct formation during chlorination process restrict its applicability. Some separation process is required for selective separation of NH4+ ions from polluted stream. For high salinity solutions the standard separation techniques as ion exchange, reverse osmosis or electrodialysis doesn’t have desired efficiency. The dialysis process use as driving force the concentration gradient. In the case of similar salinity of the both sides of ion selective membrane the only one transported item is the NH4+ ion. The dialysis process was therefore studied as potential separation step in ammonia removal technology designed for solution of high salinity. The rate of ammonia separation in dependence of NH4+ concentration was identified in lab scale dialyser equipped with cation selective membranes CM-PES Ralex (Mega a.s.). Diluate and concentrate solutions of various concentrations were tested. It was proved that dialysis process is capable to separate NH4+ ions from solution of high salinity.