AWWA ACE61767

This slide presentation discusses the theory that organic acids will complex with Fe(III), so they both get sorbed onto granular activated carbon (GAC); arsenic will adsorb onto the iron in the organic carboxyl-iron complexes; and, rusty iron will magnify the arsenic removal capacity of the organic carboxyl - iron preloaded GAC. Experimental conditions included: bituminous coal based activated carbon (Ultracarb) from U.S. Filter # WESTATE; groundwater from Rutland, Massachusetts contained arsenic concentration ranges from 45-55 ppb; and, arsenic analysis is conducted via ICP-MS method. Specific topics covered include: organic carboxyl-iron complexes for pre-loading GAC; RSSCT of Citric acid-Fe preloaded GAC; RSSCT's with CA-Fe preloaded GAC; digestion of the arsenic adsorbent; arsenic distribution of CA-Fe-pH6 column; arsenic distribution of CA-Fe-pH6 column; conclusions and future research.