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effluents (anode, cathode, and seawater) from the E-CEM. Electrode flowrates and electrode recycling will be part of the evaluation. 7.0 CONCLUSIONS In conclusion, two separate evaluations of the E-CEM performance as a function of water composition fed to the electrode compartments of the E-CEM have shown that running KW-city water effects E-CEM performance under standard operating flowrate (60 gpd) conditions to the electrodes. Lowering the standard flowrate from 60 gpd to 9 gpd in the electrode compartments at the highest current density (612 A/m2) applied to the E-CEM produces similar electrical efficiencies regardless of the type of water (RO vs KW-city water) fed to the electrode compartments. Changes in the rate in which the E-CEM produces CO2 from seawater is shown at the lower current densities using KW-city water as the electrode source. The final combined pH of the effluent is not effected by changing water composition fed to the electrode compartments. Higher discharge pH was found in the colder months of operation as the salinity and temperature of the water is lower. Quantitative measurements of free chlorine concentration of the combine E-CEM effluent solutions found that using KW-city water lowered the free chlorine concentration by 78%. Preliminary evaluations of the anode effluent found that the free chlorine could be reduced by as much as 60% treating the water with UV light. The effects this treatment will have on the combined effluent is still yet to be determined and will be the subject of near future evaluations. Finally, these evaluations suggest while using KW-city water as the electrode feed, the E-CEM electrical efficiency can be maintained and the effluent pH and effluent free chlorine can be controlled by changing the individual electrode water flowrates. 8.0 MILESTONES Successful demonstration of the E-CEM using KW-city water as the feed to the electrode compartments. Successful identification of operating parameters that will maintain E-CEM electrical efficiency and CO2 production efficiencies using KW-city water as the feed to the electrode compartments. Successful reduction in free chlorine produced at the anode of the E-CEM using KW-city water as the feed to the electrode compartments. Successful identification of key hardware and software capabilities that will be added to the future prototype skid to ensure maximum operational flexibility to ensure E-CEM performance while maintaining effluent water quality in terms of pH and free chlorine content. 20PDF Image | Extraction CO2 H2 in Seawater Electrolytic Cation Exchange
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