ELECTROCHEMICAL REDUCTION, ELECTRODIALYSIS AND PRECIPITATION FOR IRON CONTROL IN AIR-STRIPPING GROUNDWATER

AN ELECTROCHEMICAL PROCESS THAT ALLOWS IRON TO BE REMOVED BY ELECTROCHEMICAL REDUCTION, ELECTRODIALYSIS AND PRECIPITATION IS PRESENTED IN THIS PHASE I PROPOSAL. THE ADVANTAGE OF THIS PROPOSED PROCESS OVER OTHER PROCESSES IS THAT BY USING ELECTRODIALYSIS PRECIPITATING CHEMICALS ARE NOT ADDED TO THE WHOLE PROCESS STREAM IN ORDER TO PRECIPITATE SMALL AMOUNTS OF IRON. A REUSABLE PRECIPITATING SOLUTION IS EMPLOYED WHERE ONLY THE AMOUNT OF SOLUTION NEEDED TO PRECIPITATE THE IRON IS USED. THIS REUSABLE STREAM SAVES CONSIDERABLY ON PRECIPITATING CHEMICAL COST AND REMOVES THE NEED FOR NEUTRALIZATION OF THE PROCESS STREAM. PHASE II WILL EXTEND THE PROCESS PERFORMANCE TO HANDLE THE BROADEST POSSIBLE RANGE OF GROUNDWATER CONDUCTIVITY AND ORGANIC CONTAMINATE CONCENTRATION AT A U.S. AIR FORCE APPROVED SITE.