METHOD AND APPARATUS FOR TREATING SELENIUM-CONTAINING WATER

摘要

Selenium-containing water containing ions of a metal which is nobler than titanium and which is a coexisting substance is stably and efficiently treated. A pretreatment of removing ions of the metal nobler than titanium from the selenium-containing water is performed prior to the reduction treatment of selenium with the mixture of metallic titanium and the simple metal baser than titanium. In a reduction treatment step of selenium, noble metal ions in the selenium-containing water are reduced on the surfaces of particles of metallic titanium in a titanium/base metal mixture to form precipitates, which adhere to the surfaces of the metallic titanium particles, resulting in the decrease in efficiency of a reduction reaction. This problem can be solved in such a manner that the noble metal ions are removed prior to the reduction treatment of selenium.