Electrochemical processing of nitrate waste solutions

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Nitrate and nitrite have been almost completely removed from the synthetic effluent steam with good efficiency by affecting a separation across a pair of ion exchange membranes. In addition to recovering acid and base in this process, the volume of the remaining effluent is reduced considerably by transport of water across the membrane. One of the problems that remains with this process, however, is the stability of the membranes and particularly the stability of the anion exchange membrane. This membrane is exposed to both nitric acid and strongly alkaline solutions in the cell and to date long term stability has ... continued below

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Pages: (153 p)

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Creator: Unknown. October 12, 1990.

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Description

Nitrate and nitrite have been almost completely removed from the synthetic effluent steam with good efficiency by affecting a separation across a pair of ion exchange membranes. In addition to recovering acid and base in this process, the volume of the remaining effluent is reduced considerably by transport of water across the membrane. One of the problems that remains with this process, however, is the stability of the membranes and particularly the stability of the anion exchange membrane. This membrane is exposed to both nitric acid and strongly alkaline solutions in the cell and to date long term stability has been a problem with the membranes tested. It is recommended that further work should evaluate other newly available membranes as well as study the effects of radiation on the performance of the membranes. The direct reduction of nitrate and nitrite has been studied at several different electrode materials and it has been demonstrated that cathode material has a large effect on both the efficiency and the gas product distribution. Highest current efficiencies for the reduction process are seen at those electrode materials that are known to show high hydrogen overpotentials. Flow cell studies have demonstrated that temperature and current density are also important parameters in the system. The reduction process has been run efficiently at high current densities (600 mAcm{sup {minus}2}) at 80{degrees}C at a lead cathode.

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Pages: (153 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE92009750
  • Report No.: WSRC-TR-90-491
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/5731440 | External Link
  • Office of Scientific & Technical Information Report Number: 5731440
  • Archival Resource Key: ark:/67531/metadc1093548

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • October 12, 1990

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 2, 2018, 7:59 p.m.

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Electrochemical processing of nitrate waste solutions, report, October 12, 1990; United States. (digital.library.unt.edu/ark:/67531/metadc1093548/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.