Jump to main content
Jump to site search

Issue 3, 2014
Previous Article Next Article

Nanoscale zero-valent iron (nZVI) for the treatment of concentrated Cu(II) wastewater: a field demonstration

Author affiliations

Abstract

A field demonstration was conducted to assess the feasibility of nanoscale zero-valent iron (nZVI) for the treatment of wastewater containing high levels of Cu(II). Pilot tests were performed at a printed-circuit-board manufacturing plant, treating 250 000 L of wastewater containing 70 mg L−1 Cu(II) with a total of 55 kg of nZVI. A completely mixed reactor of 1,600 L was operated continuously with flow rates ranging from 1000 to 2500 L h−1. The average Cu(II) removal efficiency was greater than 96% with 0.20 g L−1 nZVI and a hydraulic retention time of 100 min. The nZVI reactor achieved a remarkably high volumetric loading rate of 1876 g Cu per m3 per day for Cu(II) removal, surpassing the loading rates of conventional technologies by more than one order of magnitude. The average removal capacity of nZVI for Cu(II) was 0.343 g Cu per gram of Fe. The Cu(II) removal efficiency can be reliably regulated by the solution Eh, which in turn is a function of nZVI input and hydraulic retention time. The ease of separation and recycling of nZVI contribute to process up-scalability and cost effectiveness. Cu(II) was reduced to metallic copper and cuprite (Cu2O). The end product is a valuable composite of iron and copper (∼20–25%), which can partially offset the treatment costs.

Graphical abstract: Nanoscale zero-valent iron (nZVI) for the treatment of concentrated Cu(ii) wastewater: a field demonstration

Back to tab navigation

Publication details

The article was received on 31 Oct 2013, accepted on 27 Nov 2013 and first published on 28 Nov 2013


Article type: Paper
DOI: 10.1039/C3EM00578J
Author version
available:
Download author version (PDF)
Citation: Environ. Sci.: Processes Impacts, 2014,16, 524-533
  •   Request permissions

    Nanoscale zero-valent iron (nZVI) for the treatment of concentrated Cu(II) wastewater: a field demonstration

    S. Li, W. Wang, W. Yan and W. Zhang, Environ. Sci.: Processes Impacts, 2014, 16, 524
    DOI: 10.1039/C3EM00578J

Search articles by author

Spotlight

Advertisements