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REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 01-08-2017 Memorandum Report 3. DATES COVERED (From - To) 4. TITLE AND SUBTITLE Extraction of Carbon Dioxide and Hydrogen from Seawater By an Electrolytic Cation Exchange Module (E-CEM) Part V: E-CEM Effluent Discharge Composition as a Function of Electrode Water Composition 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) Heather D. Willauer, Felice DiMascio,1 and Dennis R. Hardy2 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER 63-1C27-07 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) Naval Research Laboratory, Code 6300 4555 Overlook Avenue, SW Washington, DC 20375-5320 8. PERFORMING ORGANIZATION REPORT NUMBER NRL/MR/6360--17-9743 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) Office of Naval Research One Liberty Center 875 North Randolph Street, Suite 1425 Arlington, VA 22203 10. SPONSOR / MONITOR’S ACRONYM(S) ONR 11. SPONSOR / MONITOR’S REPORT NUMBER(S) 12. DISTRIBUTION / AVAILABILITY STATEMENT Approved for public release; distribution is unlimited. 13. SUPPLEMENTARY NOTES 1Office of Naval Research (ONR), Arlington, VA 2Nova Research Inc., Alexandria, VA 14. ABSTRACT A sea-based synthetic fuel process that combines carbon dioxide (CO2) and hydrogen (H2) to make jet fuel at sea is envisioned. However, before such a process can become feasible, methods must be developed to extract large quantities of CO2 and H2 from seawater fast and efficiently. An Electrolytic Cation Exchange Module (E-CEM) has been developed and extensively evaluated at a seawater flowrate of 0.5 gallons per minute (gpm) as a function of pH, current density, time, polarity reversal, and CO2 and H2 recovery. These evaluations have established E-CEM design parameters that are currently being used to scale-up and construct an E-CEM prototype capable of processing up to 25 gpm of seawater. This fifty time scale-up has led to the need to regulate E-CEM effluent discharge water composition with respect to pH and chlorine content. This report details the results of two separate evaluations of the E-CEM that specifically address changes in E-CEM performance and effluent concentrations with changes in influent electrode water composition and flowrate. These evaluations have identified additional software and hardware capabilities that will be included in in the prototype skid to ensure E-CEM performance and operational safety while maintaining effluent water quality. 15. SUBJECT TERMS Electrolytic Cation Exchange Module (E-CEM) Hydrogen Carbon dioxide Carbon capture 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT Unclassified Unlimited 18. NUMBER OF PAGES 26 19a. NAME OF RESPONSIBLE PERSON Heather D. Willauer a. REPORT Unclassified Unlimited b. ABSTRACT Unclassified Unlimited c. THIS PAGE Unclassified Unlimited 19b. TELEPHONE NUMBER (include area code) (202) 767-2673 i Standard Form 298 (Rev. 8-98) Prescribed by ANSI Std. Z39.18PDF Image | Extraction CO2 H2 in Seawater Electrolytic Cation Exchange
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