Performance evaluation of cation exchange membranes for ammonium removal from biowaste reject water
Noworyta, Krystian (2026)
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-202602092478
https://urn.fi/URN:NBN:fi:amk-202602092478
Tiivistelmä
The following work aims to evaluate the ability of five cation exchange membranes to remove ammonium from municipal anaerobic digestion derived reject water. The membranes examined were the RALEX CMHPP, the CMI-7000 (CXM-200), the Fujifilm Type 12 cation exchange membrane, the Forblue Selemion CMVN and the NEOSEPTA CMX.
The membranes were examined in a custom electrodialysis reactor setup with one anodic and one cathodic chamber separated by a cation exchange membrane. A current was applied between the anode and cathode to facilitate cation movement from the anodic to the cathodic compartment. During operation, pH and electrical conductivity of the anodic side were recorded, and samples were analysed via ion chromatography to determine the change in ammonium, sodium and potassium concentrations. The anodic side recirculated 250 ml of reject water while the cathodic side recirculated 300 ml of water containing 0.1 M of sodium bicarbonate.
All membranes demonstrated some degree of selectivity towards ammonium over other ions, being able to remove the majority of it. The most effective membranes at removing ammonium with the lowest amount of applied current were the RALEX CMHPP and the CMI-7000, followed by the Forblue Selemion CMVN and the Fujifilm Type 12, with the NEOSEPTA CMX being the least effective.
The membranes were examined in a custom electrodialysis reactor setup with one anodic and one cathodic chamber separated by a cation exchange membrane. A current was applied between the anode and cathode to facilitate cation movement from the anodic to the cathodic compartment. During operation, pH and electrical conductivity of the anodic side were recorded, and samples were analysed via ion chromatography to determine the change in ammonium, sodium and potassium concentrations. The anodic side recirculated 250 ml of reject water while the cathodic side recirculated 300 ml of water containing 0.1 M of sodium bicarbonate.
All membranes demonstrated some degree of selectivity towards ammonium over other ions, being able to remove the majority of it. The most effective membranes at removing ammonium with the lowest amount of applied current were the RALEX CMHPP and the CMI-7000, followed by the Forblue Selemion CMVN and the Fujifilm Type 12, with the NEOSEPTA CMX being the least effective.