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Phosphate removal from aqueous solution by electrochemical coupling siderite packed column.

Mengfei Chen1, Xuewei Li2, Qiwu Zhang1

  • 1School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.

Chemosphere
|June 24, 2021
PubMed
Summary

This study presents a simple electrochemical method using siderite to remove phosphate (PO43-) from wastewater. The process efficiently generates iron species in situ, achieving effluent concentrations below 1 mg L-1.

Keywords:
ElectrochemistryFe(3+) speciesNatural sideritePO(4)(3−) Removal

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Area of Science:

  • Environmental Chemistry
  • Electrochemistry
  • Water Treatment

Background:

  • Iron species are effective for phosphate (PO43-) removal from wastewater.
  • In situ generation of fresh Fe3+ shows enhanced PO43- removal efficiency.
  • Existing methods may require complex operations or specific oxidizers.

Purpose of the Study:

  • To develop a simpler and more efficient method for PO43- removal.
  • To utilize electrochemically dissolved siderite for in situ Fe3+ generation.
  • To optimize electrochemical parameters for effective phosphate removal.

Main Methods:

  • Electrochemical dissolution of siderite in a packed column system.
  • Optimization of current intensity, initial pH, initial PO43- concentration, and influent flow rate.
  • Wastewater treatment using in situ generated Fe3+ for PO43- adsorption.

Main Results:

  • Optimal removal conditions identified: 20 mA current, pH 6, 1 mM PO43-, and 2.5 mL min-1 flow rate.
  • Effluent PO43- concentration consistently below 1 mg L-1 was achieved.
  • Fe2+ dissolved from siderite oxidized in situ to Fe3+ without external oxidizers or added H+.

Conclusions:

  • The electrochemical treatment using siderite is a highly efficient and simple method for PO43- removal.
  • This low-cost approach offers a viable solution for treating eutrophic water bodies.
  • The in situ generation of Fe3+ from siderite bypasses the need for additional reagents, simplifying the process.