Metal (Zn, Cu, Cd and Ni) Complexation by Dissolved Organic Matter (DOM) in Wastewater Treatment Plant Effluent

• CHAMINDA G. G. Tushara

  Department of Civil and Environmental Engineering, Faculty of Engineering, University of Ruhuna, Sri Lanka

• NAKAJIMA Fumiyuki

  Environmental Science Center, The University of Tokyo, Japan

• FURUMAI Hiroaki

  School of Engineering, The University of Tokyo, Japan

• KASUGA Ikuro

  School of Engineering, The University of Tokyo, Japan

• KURISU Futoshi

  School of Engineering, The University of Tokyo, Japan

Abstract

Eight effluent samples were collected from four conventional activated sludge wastewater treatment plants (WWTPs) to determine the complexation of Zn, Cu, Cd and Ni by dissolved organic matter (DOM) in WWTP effluent. The collected effluents were subjected to determine the labile Zn, Cu, Cd and Ni concentrations using Empore^TM chelating disk cartridge. It was observed that more than 55% of the dissolved metals were strongly complexed by ligands in the effluents. In addition, the Zn, Cu and Cd titration data obtained by square wave anodic stripping voltammetry were interpreted with Scatchard linearization to determine the conditional stability constant and the total binding site concentrations of DOM in three of the WWTP effluents. The titration data for Zn and Cu fitted to a two-ligand system while Cd data represented a one-ligand system. The conditional stability constant for Cu was greater than that for Zn with DOM in WWTP effluents. Zinc complexation parameters in natural organic matter (river water DOM and Suwanee River humic substances) were also compared with those of DOM in WWTP effluents. The results demonstrated higher stability constant and higher binding site concentrations for the DOM in WWTP effluents than the natural organic matter.

Journal

• Journal of Water and Environment Technology

  Journal of Water and Environment Technology 11 (3), 153-161, 2013

  Japan Society on Water Environment

Keywords

• cadmium
• copper
• dissolved organic matter
• metal complexation
• nickel
• stability constant
• wastewater treatment plant effluent
• zinc

Details

• CRID: 1390001205181135744
• NII Article ID: 130003363017
• DOI: 10.2965/jwet.2013.153
• ISSN: 13482165
• Web Site: https://www.jstage.jst.go.jp/article/jwet/11/3/11_153/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed