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Assessment of zero‐valent iron as a permeable reactive barrier for long‐term removal of arsenic compounds from synthetic water

2009; Taylor & Francis; Volume: 30; Issue: 13 Linguagem: Inglês

10.1080/09593330903186240

1479-487X

Kui‐Jae Lee, Yunho Lee, Jeyong Yoon, Seralathan Kamala‐Kannan, Seung‐Moon Park, Byung‐Taek Oh,

Heavy Metal Exposure and Toxicity

Zero-valent iron (ZVI) has great potential to be used as a remediation material for the removal of a wide range of pollutants from groundwater. The present study assessed the potential of ZVI for arsenic remediation by investigating (i) the removal kinetics of arsenic by ZVI in a batch reactor and (ii) the longevity of ZVI to remove arsenic in a flow-through column system which mimics the permeable reactive barrier (PRB) technology. Results of the batch experiments showed an effective removal (99.5%) of arsenic compounds from the synthetic water samples. Based on our kinetic study, the arsenic removals are expected to occur in a timescale of less than a few hours in typical PRB treatment conditions using ZVI (e.g. [ZVI] > 20 g/L and [As] < 1 mg/L). The flow-through columns were continuously operated for 360 days at a flow rate of 2 mL/h. Samples were taken at regular intervals (90, 150, 230 and 360 days) and analysed for total arsenic concentration. The removal rates decreased by (45% in aerobic and 39% in anoxic) after 360 days of operation indicate that the regular replacement of the reactive material would be required for efficient removal of arsenic.