Abstract
During the paper recycling process, paper sludge fly ash is discharged as industrial waste. In this study, the ability of paper sludge fly ash to be utilized for purification of acidic heavy metals solutions was investigated to develop a new method for the removal of heavy metals. When the ratio of adding paper sludge fly ash to acidic heavy metals solution is 1/100, the pH of the solution can be neutralized, and almost all heavy metals in the solution can be removed. The percentages of removal for Fe, Cr, Zn, Cd, Mn, and Ni were high (>90%), and Cu and Pb were somewhat lower (Cu: 89.6 and Pb: 81.6%), whereas those for Mo and B were 51.5% and 58.5%, respectively. After the treatment, heavy metals taken in the residue were fixed, and the solidification rate was 85-100%. From these results, it was suggested that paper sludge fly ash has enough ability to purify acidic heavy metal solutions.
