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A novel method for remediation of nickel containing wastewater at neutral conditions

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Title: A novel method for remediation of nickel containing wastewater at neutral conditions
Authors: Hase, Haruko Browse this author
Nishiuchi, Toru Browse this author
Sato, Tsutomu Browse this author →KAKEN DB
Otake, Tsubasa Browse this author
Yaita, Tsuyoshi Browse this author
Kobayashi, Tohru Browse this author
Yoneda, Tetsuro Browse this author →KAKEN DB
Keywords: Layered double hydroxide
Wastewater treatment
Geochemical modeling
Issue Date: 5-May-2017
Publisher: Elsevier
Journal Title: Journal of hazardous materials
Volume: 329
Start Page: 49
End Page: 56
Publisher DOI: 10.1016/j.jhazmat.2017.01.019
Abstract: Heavy metals contained in wastewater are generally removed by adding antalkaline to increase the pH, and Ni is commonly precipitated as Ni-hydroxides at pH 10. However, a more sustainable remediation method of treatment at neutral conditions would be attractive due to the high cost of chemical reagents and inefficient treatment at present. Based on natural attenuation, the method of adding Al ions has been used in wastewater treatment to precipitate layered double hydroxides (LDH). Here, we investigated the use of Al ion addition in the Ni containing wastewater treatment, experimentally and thermodynamically. By co-precipitation experiments adding Al ions to Ni-containing water, Ni was selectively incorporated into the structure of LDH, and the removal efficiency of Ni was close to 100% even in pH 7 and 8 samples (lower pH than conventional methods) with initial Ni concentrations of 200-10,000 mg/L. Geochemical modeling results replicate the experimental results well when the Al/Ni ratio of LDH is assumed to be 0.33. This model makes it possible to estimate the amount of Al ions and additive agents necessary for use in treatment of wastewater containing different Ni concentrations.
Rights: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 長谷 東子

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