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

作者：Lee Kui Jae; Lee Yunho; Yoon Jeyong^*; Kamala Kannan Seralathan; Park Seung Moon; Oh Byung Taek

来源：Environmental Technology, 2009, 30(13): 1425-1434.

DOI：10.1080/09593330903186240

• arsenic adsorption
• groundwater remediation
• oxidation
• permeable reactive barrier
• zero-valent iron

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.

• 出版日期2009