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Heavy metal dissolution mechanisms from electrical industrial sludge.

Authors
  • Gunarathne, Viraj1
  • Rajapaksha, Anushka Upamali2
  • Vithanage, Meththika3
  • Adassooriya, Nadeesh4
  • Cooray, Asitha5
  • Liyanage, Sudantha6
  • Athapattu, Bandunee7
  • Rajakaruna, Nishanta8
  • Igalavithana, Avanthi Deshani9
  • Hou, Deyi10
  • Alessi, Daniel S11
  • Ok, Yong Sik12
  • 1 Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Sri Lanka. , (Sri Lanka)
  • 2 Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Sri Lanka; Instrument Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Sri Lanka. Electronic address: [email protected] , (Sri Lanka)
  • 3 Ecosphere Resilience Research Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Sri Lanka; Instrument Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Sri Lanka. , (Sri Lanka)
  • 4 Department of Food Science and Technology, Wayamba University of Sri Lanka, Makandura, Gonawila 60170, Sri Lanka. , (Sri Lanka)
  • 5 Instrument Centre, Faculty of Applied Sciences, University of Sri Jayewardenepura, Sri Lanka; Department of Chemistry, Faculty of Applied Sciences, University of Sri Jayewardenepura, Sri Lanka. , (Sri Lanka)
  • 6 Department of Chemistry, Faculty of Applied Sciences, University of Sri Jayewardenepura, Sri Lanka. , (Sri Lanka)
  • 7 Department of Civil Engineering, The Open University of Sri Lanka, Nawala, Nugegoda, Sri Lanka. , (Sri Lanka)
  • 8 Biological Sciences Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA; Unit for Environmental Sciences and Management, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa. , (South Africa)
  • 9 Korea Biochar Research Center & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea. , (North Korea)
  • 10 School of Environment, Tsinghua University, Beijing 100084, China. , (China)
  • 11 Department of Earth and Atmospheric Sciences, University of Alberta, AB T6G 2E3, Canada. , (Canada)
  • 12 Korea Biochar Research Center & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea. Electronic address: [email protected] , (North Korea)
Type
Published Article
Journal
The Science of the total environment
Publication Date
Dec 15, 2019
Volume
696
Pages
133922–133922
Identifiers
DOI: 10.1016/j.scitotenv.2019.133922
PMID: 31446288
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In this paper, we investigate the release of heavy metals from sludge produced from an electrical industry using both organic and inorganic acids. Single and sequential extractions were conducted to assess heavy metals in different phases of the sludge. Metal release from sludge was investigated in the presence of three inorganic acids (nitric, sulfuric, and phosphoric) and three organic acids (acetic, malic, and citric) at concentrations ranging from 0.1 to 2.0 mol L-1. Sequential extraction indicated the presence of Cu primarily in the carbonate fraction, Pb in the residual fraction, and Ni in the FeMn oxide fraction. The cumulative release rates of heavy metals (i.e., Pb, Cu, and Ni) by 1.0 mol L-1 of acid increased with the use of the following acids in the order of: malic < sulfuric < acetic < phosphoric < citric < nitric. Acetic acid exhibited the highest release of Cu, at a rate of 72.62 × 10-11 mol m-2 s-1 at pH 1, and malic acid drove the release of Pb at a maximum rate of 3.90 × 10-11 mol m-2 s-1. Meanwhile, nitric acid provided the maximum rate of Ni release (0.23 × 10-11 mol m-2 s-1) at pH 1. The high rate of metal release by organic acids is explained through ligand-promoted mechanisms that enhance the release of metal ions from the sludge. The results from our study emphasize that an understanding of the metal release mechanism is key to selecting the optimal acid for the maximum recovery of heavy metals. Copyright © 2019. Published by Elsevier B.V.

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