@article{oai:iwate-u.repo.nii.ac.jp:00010353,
 author = {伊藤, 歩 and 山田, 浩司 and 武田, 祐介 and 北田, 久美子 and 相澤, 治郎 and 海田, 輝之},
 issue = {458},
 journal = {下水道協会誌},
 month = {Dec},
 note = {The removal of heavy metals from incinerated ash of sewage sludge was studied by using a metal leaching process through chemical or biological acidification of the ash. The chemical acidification of the ash with sulfuric acid caused the elution of heavy metals from the ash, and the concentration of heavy metals eluted increased with a decrease in the ash pH. The elution percentages of Al, As, Cd, Cr, Cu, Fe, Mn, Ni and Zn at pH 1 were 75%, 80%, 90%, 35%, 90%, 45%, 80%, 45% and 55%, respectively. Although the biological acidification by using sulfur oxidizing bacteria required elemental sulfur and nutrients such as nitrogen and phosphorus, the ash pH was decreased below 3 from 7 by utilizing a dry or wet desulfurization residue containing sulfur and sewage secondary treatment effluent instead of elemental sulfur and synthetic medium, respectively. The elution percentages of heavy metals by the biological leaching utilizing the wet desulfurization residue almost corresponded with those by the chemical one. It was concluded that the biological leaching of heavy metals from incinerated ash of sewage sludge could be economically and efficiently achieved in a system utilizing sulfur oxidizing bacteria, desulfurization residue and sewage secondary treatment effluent taken from sewage treatment plants.},
 pages = {166--180},
 title = {下水汚泥焼却灰に含まれる重金属類の溶出に関する研究},
 volume = {37},
 year = {2000}
}