| 摘要 |
PROBLEM TO BE SOLVED: To determine a requirement of a heavy-metal processing agent simply, rapidly, inexpensively, and accurately when a heavy metal in a heavy-metal containing material such as fly ash is to be insolubilized.SOLUTION: For a requirement determination apparatus for a heavy-metal processing agent having a detector that can detect a turbidity change of a solution where heavy metals have been eluted out of a heavy-metal containing material and the function of calculating a requirement of the heavy-metal containing material from an addition amount of the heavy-metal processing agent at an end point where the turbidity change turns constant or at an inflection point of the turbidity change, an apparatus is used which has a transparence measurement container for supplying a heavy-metal solution, a mixer having the function of mixing the heavy-metal solution, a chemical agent injection part for supplying a heavy-metal processing agent for turbidity measurement from above the mixer, and a laser light source and light receiving part on a lateral part of the transparence measurement container. |
