Removal and recovery of Ni, Cu and Fe from heavy metal effluent by reduction crystallization
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Subtitle: Removal and recovery of Ni, Cu and Fe from heavy metal effluent by reduction crystallization
Author list: Muzenda, Edison
Publisher: Springer Verlag (Germany)
Publication year: 2011
Journal: Metals and Materials International (1598-9623)
Volume number: 145
Start page: 681
End page: 690
Number of pages: 10
ISSN: 1598-9623
eISSN: 2005-4149
URL: https://www.witpress.com/elibrary/wit-transactions-on-ecology-and-the-environment/145/22131
Languages: English-United States (EN-US)
Abstract
Due to the fast depletion of water reserves globally, the toxicity of heavy metals and the negative impact posed to the environment; the current focus in wastewater treatment is now on the removal and re-use of these heavy metals rather than removal and disposal in landfills. This study investigated the use of hydrazine as a reducing agent to remove and recover Ni, Cu and Fe from wastewater by reduction crystallization. Feasibility studies were carried out to test the efficiency and find the optimum operating conditions for this method and generate an understanding of the chemical and particulate process occurring. The experiments were conducted on a 20L batch reactor using synthetic solutions containing a mixture of nickel, copper and iron. The results show that hydrazine can recover and crystallize Ni, Cu and Fe into their elemental form: 99.30% Ni was removed from the Ni-solution, 99.26% Ni and 98.81% Cu were removed from the Ni-Cu solution, over 99.90% Ni and 97.70% Fe were removed from the Ni-Fe solution. Evolution of the PSD revealed that breakage and molecular growth were the predominant particulate processes occurring, a finding which was validated by the scanning electron micrographs of the powder obtained.
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