| Abstract |
| This study was designed to set up a theoretical mechanism for removal and separation of heavy metal ions from aqueous solutions by analysing reaction between pH and heavy metal ions, and to offer useful data for treatment applications of wastewater containing heavy metals in the future. The obtained results are as follows: Each heavy metal ion has a unique curve between pH and residual heavy metal concentration. When two types of heavy metals are complexed, the reaction rate between OH- and heavy metal ion is more affected by ionization strength rather than competitive reaction. When three types of heavy metals are combined, the ultra-fine particle is formed at about 1-2 lower PH than in the case that independently existed. This is because chemical reaction was caused by complicated reactions of pH of the minimum soluble product, ionization strength, and competitive reaction. The electric field makes ultra-fine particles having a very small amount of charge move more easily than large colloidal particles. Therefore, this study shows that it is possible to improve the efficiency of selective flocculation by electrolysis at PH which forms ultra-fine particles of metal-hydroxides by the application of the results. |
|
|
| Key Words |
| Heavy metal, Selective removal, Chemical precipitation, Competitive reaction, Metal-hydroxides |
|
|
|
|
|
PDF