| 초록 |
Nanofiltration (NF) and Reverse Osmosis (RO) membranes have potential to reject micropollutants in water and wastewater treatment. However. the rejection efficiency highly depends on the molecular characteristics of pollutants including molecular weight, charge, solution chemistry, and operation conditions. In this study, a theoretical method based on the extended Nernst-Planck equation coupled with a steric hindrance model was suggested to control the rejection of micropollutants by NF/RO membranes. Nitrogen compounds including urea, ammonium, nitrate, nitrite were used as a model case. The molecular weight and chemical structure of small molecules/ions such as the nitrogen compounds appear to be less important in determining rejection than electrostatic properties. This suggests that better treatment efficiency for organic compounds can be obtained after modify their chemical structures through chemical or biological ways. |
