title: Arsenic treatment and power generation with a dual-chambered fuel cell with anionic and cationic membranes using NaHCO3anolyte and HCl or NaCl catholyte.
abstract: Dual-chambered fuel cells with an iron anode and an air-carbon cathode separated by an ion exchange membranes have been used to treat arsenate during power production. To select an effective catholyte, the dual-chambered fuel cell consisted 90 mL of 0.1 M HCl or 0.5 M NaCl as the catholyte and 1 L of 0.1 M NaHCO3as the anolyte at an initial pH 5. The 0.1 M HCl was an effective catholyte, with which 1 ppm arsenate in 1 L of anolyte was reduced to 5 ppb in 1 h, and the maximum power density was about 6.3 w/m2with an anion exchange membrane fuel cell (AEM_FC) and 4.4 w/m2with a cation exchange membrane fuel cell (CEM_FC). Therefore, 90 mL of 0.1 M HCl was used as a catholyte to treat 20 L of 0.1 M NaHCO3anolyte containing 1 ppm arsenate at an initial pH of 5 or 7. The arsenate level at pH 5 decreased to less than 5 ppb in 4 h, and the maximum power density was 5.9 W/m2and 4.7 W/m2with AEM_FC and CEM_FC, respectively. When using 0.01 M NaHCO3as the anolyte at pH 5, arsenate was reduced to less than 5 ppb in 8 and 24 h for AEC_FC and CEM_FC, respectively. However, when using an anolyte at pH 7, arsenate could not be effectively removed in 24 h. Therefore, when using carbonate as an anolyte, the solution should be adjusted to a weakly acidic pH in order to remove arsenate.
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul, 133-791, Republic of Korea.
authors.forename: Hubdar Ali
authors.initials: HA
authors.lastname: Maitlo
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul, 133-791, Republic of Korea. Electronic address: genkjh@hanyang.ac.kr.
authors.forename: Jung Hwan
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul, 133-791, Republic of Korea. Electronic address: jooypark@hanyang.ac.kr.
authors.forename: Joo Yang
authors.initials: JY
authors.lastname: Park
mesh_terms: D000838:Anions; D001151:Arsenic / Q000032:analysis*; D001674:Bioelectric Energy Sources; D002244:Carbon / Q000737:chemistry; D002412:Cations; D004566:Electrodes; D007474:Ion Exchange; D007501:Iron / Q000737:chemistry; D008567:Membranes, Artificial; D008962:Models, Theoretical; D010100:Oxygen / Q000737:chemistry; D017693:Sodium Bicarbonate / Q000737:chemistry*; D012965:Sodium Chloride; D012996:Solutions; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D000838:Anions; D001151:Arsenic; D002244:Carbon; D002412:Cations; D007501:Iron; D008567:Membranes, Artificial; D010100:Oxygen; D017693:Sodium Bicarbonate; D012965:Sodium Chloride; D012996:Solutions; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Arsenate removal; Ionic membranes; Iron-air dual-chambered fuel cell; Power generation