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CONSTRUCTION OF A SELF-POWERED SYSTEM FOR SIMULTANEOUS IN SITU REMEDIATION OF NITRATE AND CR(VI) CONTAMINATED SYNTHETIC GROUNDWATER AND RIVER SEDIMENT
Han, L., R. Liu, M. Li, N. Zhang, F. Zhang, and X. Liu.
Sustainability 10(8):Paper 2806(2018)

A novel self-powered system was constructed to remove nitrate and Cr(VI) from synthetic groundwater in situ and achieve their simultaneous remediation in river sediment. The sediment organic matter in an anodic chamber provided a carbon source for self-powered energy to reduce the cathode's contaminants. With the acceptance of protons and electrons, nitrate and Cr(VI) were transformed into nitrite and Cr(III), respectively. In a 72-h test in the presence of both nitrate and Cr(VI), the system removed nitrate at a rate of 70.96 mg/m3/h and Cr(VI) at a rate of 8.95 mg/m3/h. When a phosphate buffer was used in the test, the removal rates changed to 140.83 mg/m3/h and 8.33 mg/m3/h, respectively. Results demonstrated that the self-powered system could achieve simultaneous reduction of nitrate and Cr(VI) with no need for additional energy or materials, although the presence of Cr(VI) hindered nitrate reduction. This paper is Open Access at https://www.mdpi.com/2071-1050/10/8/2806.



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