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To meet the new arsenic MCL, Albuquerque, N. M. , will construct its first arsenic treatment facility. Three treatment technologies for removing arsenic from groundwater in Albuquerque, N. M. , were compared: ion exchange (IX), iron hydroxide coagulation followed by microfiltration (C/MF), and activated alumina (AA) adsorption. For an 8, 700‐m 3 /d (2. 3‐mgd) arsenic treatment facility, capital costs of the three processes were similar: 5. 2 million, 4. 1 million, and 4. 6 million, respectively. Annual operations and maintenance costs were 447, 000, 273, 000 and 444, 000, respectively. The principal differences were the result of large salt requirements for the IX process and the need to reduce the pH to 6 for AA adsorption, followed by base addition to stabilize the water. The C/MF system was selected for a demonstration facility in Albuquerque.
Chwirka et al. (Wed,) studied this question.