| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for disposing a waste liquid containing a plurality of metals in which metal hydroxides sedimented by neutralization of the waste liquid are separated on a type-by-type basis, and large particles of metal hydroxides are formed to improve the efficiency of dehydration processing to obtain a low moisture sludge which can be put to effective use. SOLUTION: The waste liquid 11 containing a plurality of metal ions are continuously supplied into containers 16, 20 while the pH of the waste liquid 11 is adjusted in a plurality of stages, and the metal hydroxides precipitated under the adjusted pH of the waste liquid 11 are separated and collected.</p> |
