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Received: 2004-05-18

Revision Accepted: 2004-06-07

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Cited: 16

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Journal of Zhejiang University SCIENCE B 2005 Vol.6 No.3 P.182-186


Reductive denitrification of nitrate by scrap iron filings

Author(s):  HAO Zhi-wei, XU Xin-hua, WANG Da-hui

Affiliation(s):  Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   hawk200044@126.com

Key Words:  Denitrification, Scrap iron filings (SIF), Zero-valent iron, Nitrate, Mechanism

HAO Zhi-wei, XU Xin-hua, WANG Da-hui. Reductive denitrification of nitrate by scrap iron filings[J]. Journal of Zhejiang University Science B, 2005, 6(3): 182-186.

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A1 - HAO Zhi-wei
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A1 - WANG Da-hui
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DOI - 10.1631/jzus.2005.B0182

Reduction of nitrate by zero-valent iron is a highly exergonic reaction that has long been known to occur. Use of scrap iron filings (SIF) as the PRB (Permeable Reactive Barrier) material can be used to recycle certain by-products, and identify cheaper replacements for expensive conventional PRB materials, especially pure metallic iron. The feasibility of reductive denitrification of nitrate by SIF was studied by batch experiments. Operational parameters such as pH value, SIF dosage and initial concentration of nitrate were investigated. The removal efficiency of nitrate reached 80% under the conditions of pH of 2.5, nitrate initial concentration of 45 mg/L and SIF dosage of 100 g/L within 4 h. Results indicated that nitrate removal is inversely related to pH. Low pH value condition favors for the nitrate transformation. Different from the results of others who studied nitrate reduction using iron powder, we found that there was a lag time before nitrate reduction occurs, even at low pH. Finally, the possible mechanism of nitrate reduction by Fe0 is discussed.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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