Chemistry of the M (M=Fe, Ca, Ba)-Se-H(2)O systems at 25 degrees C.
The chemistry of the M (M=Fe, Ca, Ba)-Se-H(2)O systems at 25 degrees C is reviewed based on our previous papers. In this paper, the phase equilibria in the Fe(III)-Se(IV)-H(2)O, Ca-Se(IV,VI)-H(2)O and Ba-Se(IV,VI)-H(2)O systems at 25 degrees C are discussed. Then, the three-stage process for removal of selenium from industrial waste water [Se(IV,VI) < 1,500 mg/L] containing sulfuric acid was introduced. This seems to be a promising process for selenium removal from acidic sulfate waste water containing high concentration levels of selenium to below 0.1 mg/L.
Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 1,1 Katahira, 2-chome, Aobaku, Sendai 980-8577, Japan. tadahisa@tagen.tohoku.ac.jp
Tadahisa
T
Nishimura
Ryosuke
R
Hata
Fumihiko
F
Hasegawa
D004602:Elements; D007220:Industrial Waste / Q000032:analysis; D012643:Selenium / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
D004602:Elements; D007220:Industrial Waste; D014867:Water; D012643:Selenium