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Arsenite Removal from Simulated Groundwater by Biogenic Schwertmannite: A Column Trial

Authors
Journal
Pedosphere
1002-0160
Publisher
Elsevier
Volume
23
Issue
3
Identifiers
DOI: 10.1016/s1002-0160(13)60032-6
Keywords
  • Adsorption Capacity
  • As(Iii)
  • Breakthrough Volume
  • Empty Bed Contact Time
  • Sorbent

Abstract

Abstract To assess the feasibility of biogenic schwertmannite to act as a sorbent for removing arsenite from groundwater, a series of biogenic schwertmannite-packed column adsorption experiments were conducted on simulated As(III)-containing groundwater. Empty bed contact time (EBCT), As(III) concentration in effluent, and the removal efficiency of As(III) through the column were investigated at pH 8.0 and temperature 25 ± 0.5 °C. The results showed that the breakthrough curves were mainly dependent on EBCT values when the influent As(III) concentration was 500 μg L−1 and the optimum EBCT was 4.0 min. When the effluent As(III) concentration reached 10 and 50 μg L−1, the breakthrough volumes for the schwertmannite adsorption column were 4 200 and 5 600 bed volume (BV), with As(III) adsorption capacity of 2.1 and 2.8 mg g−1, respectively. Biogenic schwertmannite could be regenerated by 1.0 mol L−1 NaOH solution, and more than 80% of As(III) adsorbed on the surface of schwertmannite could be released after 3 successive regenerations. The breakthrough volume for the regenerated schwertmannite-packed column still maintained 4 000–4 200 BV when the As(III) concentration in effluent was below 10 μg L−1. Compared with other sorbents for As(III) removal, the biogenic schwertmannite-packed column had a higher breakthrough volume and a much higher adsorption capacity, implying that biogenic schwertmannite was a highly efficient and potential sorbent to purify As(III)-contaminated groundwater.

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