Elution Control of the Lead from the Fly Ash by Aluminum Hydroxide or Activated Clay
As heavy metal elution control material which controls the lead compound eluted from municipal waste incineration fly ash, we examined aluminum hydroxide and various adsorbent minerals, such as activated clay. Low crystallinity aluminum hydroxide can control the lead compound elution with a smaller addition as compared with various adsorbent minerals as a result of an examination. In more lead content fly ash, only the low crystallinity aluminum hydroxide fitted the lead compound elution standard limit in waste landfills site of Japan. We considered that the following two reasons contributed to reduce the amount of lead compound elution. Aluminum hydroxide reacted to a part for the calcium of fly ash, and then it reduced the solubility of the lead compound due to the fall of the pH of an eluate. The cement hydrate which is a reaction product of aluminum and calcium fixed the lead compound. We report the test result of the amount of lead compound elution from fly ashes which were obtained from some waste incineration plant.