| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that, in a polysulfide aqueous solution made from quicklime or slaked lime and sulfur and used as a heavy metal-fixing agent in the fields of wastewater treatment and soil treatment, the reactivity of the solution with heavy metal ions is low, the fixing of heavy metals is insufficient, and the odor of the hydrogen sulfide is generated. <P>SOLUTION: A mixture having calcium hydroxide and sulfur as principal ingredients is obtained by blowing ozone gas into a polysulfide aqueous solution or adding an alkali agent thereto to change the structure of polysulfide. The use of this mixed aqueous solution as the fixing agent increases the reactivity with heavy metal ions and suppresses the generation of odor. <P>COPYRIGHT: (C)2013,JPO&INPIT |
