Applicability of nanofiltration and reverse osmosis for the treatment of wastewater of different origin |
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Authors: | Edit Cséfalvay Péter M Imre Péter Mizsey |
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Institution: | (1) Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, 1521 Budapest, Pf. 91, Hungary;(2) Gedeon Richter Nyrt. H-1475, Budapest, 10 Pf. 27, Hungary |
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Abstract: | Membrane separations are finding greater use in wastewater treatment because of their efficiency. In order to prove the effectiveness
of membrane filtration an applicability study is carried out. Nanofiltration and reverse osmosis membranes are tested under
quite different conditions to reduce the chemical oxygen demands (COD) of wastewaters to meet the Council Directive 76/464/EEC
release limit. Two kinds of real wastewaters were selected for the investigation. The wastewaters represent extreme different
circumstances since the difference between their COD is two orders of magnitude. All of the membranes tested can be applied
either to the treatment of wastewater of high COD (pharmaceutical wastewater) or wastewater of low COD (dumpsite leachate),
since the different conditions do not change the membrane characteristics. The experimental data show that none of the membranes
can decrease the COD to the release limit in one step. However, if two-stage filtrations (nanofiltration followed by reverse
osmosis) are accomplished for both of the wastewaters, a total COD reduction of 94% can be achieved. With the application
of the two-stage filtration the COD of the wastewater of low COD can be decreased below the release limit but in case of wastewater
of the high COD further treatment will be required.
![MediaObjects/11532_2008_26_Fig1_HTML.jpg](/content/x24417n54374u77r/MediaObjects/11532_2008_26_Fig1_HTML.jpg) |
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Keywords: | Membrane filtration Pharmaceutical wastewater Dumpsite leachate Chemical oxygen demand Nanofiltration Reverse osmosis |
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