@article{oai:iwate-u.repo.nii.ac.jp:00015978,
 author = {下田, 渉 and 小川, 絵莉子 and 石川, 奈緒 and 笹本, 誠 and 芝﨑, 祐二 and 伊藤, 歩},
 issue = {7},
 journal = {土木学会論文集G（環境）, Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)},
 month = {},
 note = {下水消化汚泥からの有害重金属類の低減手法の開発を目指し，繊維状キレート剤を封入したナイロンメッシュバッグを用いた酸性模擬廃水および汚泥中の溶解性重金属の吸着と脱着に及ぼすpHの影響を検討した．メッシュバッグを介してもキレート剤によって模擬廃水中の重金属を吸着できた．pH 1の希硫酸によって繊維状キレート剤に吸着した重金属を脱着できた．pHを2に調整して汚泥から溶出させた重金属を対象とした場合，メッシュバッグによる吸着に適したpHは，Cd，Cr，NiおよびZnで4，Pbで3，Cuで2.5であった．溶出した重金属の一部はpHの上昇によって汚泥浮遊物に再吸着するが，金属によってはキレート剤の存在によって再吸着が抑制された。汚泥中の主要金属は，Niを除いて微量重金属のキレート剤への吸着を妨げなかった．, In order to develop a new process for lowering harmful heavy metals from anaerobically digested sewage sludge, the adsorption and recovery of heavy metals from acidified sewage sludge were investigated using a fibrous chelating agent enwrapped with a nylon mesh bag. First, heavy metals in simulated wastewater were adsorbed to the chelating fiber through the nylon mesh with opening of 30 μm. Heavy metals adsorbed to the fiber were successfully desorbed with dilute sulfuric acid at a pH of 1. Next, the leaching of heavy metals from anaerobically digested sewage sludge was conducted by adjusting the pH of the sludge to 2 with sulfuric acid for 48 hours. And then, the pH of the acidified sludge was adjusted to 2.5, 3 and 4 after the addition of nylon mesh bag including the fiber. The optimum pH values in the adsorption with the fiber were 2.5 for Cu, 3 for Pb, and 4 for Cd, Cr, Ni and Zn, respectively. The application of the fibrous chelating agent would be useful for the recovery of soluble heavy metals from acidified sludge without using an acid tolerant solid-liquid separator.},
 pages = {III_375--III_383},
 title = {繊維状キレート剤を用いた酸性化汚泥からの重金属類の吸着除去および回収},
 volume = {77},
 year = {2021}
}