EP0048668A2 - Verfahren zum Aufarbeiten von Reduktionsmittel enthaltenden radioaktiven Abfall-Lösungen - Google Patents

Verfahren zum Aufarbeiten von Reduktionsmittel enthaltenden radioaktiven Abfall-Lösungen Download PDF

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Publication number
EP0048668A2
EP0048668A2 EP81401445A EP81401445A EP0048668A2 EP 0048668 A2 EP0048668 A2 EP 0048668A2 EP 81401445 A EP81401445 A EP 81401445A EP 81401445 A EP81401445 A EP 81401445A EP 0048668 A2 EP0048668 A2 EP 0048668A2
Authority
EP
European Patent Office
Prior art keywords
ions
effluents
reducing
sludge
reducing ions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81401445A
Other languages
English (en)
French (fr)
Other versions
EP0048668A3 (de
Inventor
Jean Arod
Jacques Corpel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0048668A2 publication Critical patent/EP0048668A2/de
Publication of EP0048668A3 publication Critical patent/EP0048668A3/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing

Definitions

  • the present invention relates to a method for treating radioactive effluents containing reducing agents.
  • Radioactive waste One of the methods used for the storage of radioactive waste consists of coating in materials such as glass, thermosetting resins and bitumen with sludge from the treatment of radioactive effluents; these radioactive effluents are saline solutions which generally come from nuclear power plants.
  • the treatment of these effluents consists in forming sludges or concentrates either by an evaporation treatment or by a precipitation treatment of insoluble salts.
  • sludges therefore contain many salts and in particular reducing agents such as nitrites, ferrous or sulphites ions as well as oxidizing agents.
  • the effluents at the origin of this sludge must have a slightly basic ph and generally between 8 and 9.
  • the subject of the present invention is precisely a method for treating radioactive effluents to remove the risk of such interactions. It applies in particular to slightly basic radioactive effluents whose sludge must be coated in bitumen.
  • the invention relates to a method for treating radioactive effluents having a slightly basic ph and containing reducing ions and oxidizing ions.
  • This process is characterized in that, before transforming these effluents into sludge, these effluents are acidified so as to obtain a pH of between 5 and 7, the reducing ions contained in these effluents are oxidized and then the acid added is neutralized to obtain a pH of between 8 and 9, the oxidation of the reducing ions making it possible to avoid possible interactions between the oxidizing ions and the reducing ions contained in the sludge, during the coating of the latter in bitumen.
  • the oxidation of the reducing ions is carried out using a solution of sodium hypochlorite.
  • the oxidation of the reducing ions is carried out using a solution of potassium permanganate.
  • the method according to the invention is preferably applicable to radioactive effluents containing as reducing ions nitrites, ferrous and sulfites ions.
  • the process for treating effluents according to the invention applies especially to slightly basic radioactive effluents, that is to say with a pH close to 8, and containing as reducing agents in particular nitrites, ferrous and sulphites ions.
  • This process consists first of all in acidifying these effluents so as to obtain an acid ph between 5 and 7 and then in oxidizing the reducing ions contained in these effluents.
  • the acidification of the radioactive medium makes it possible to facilitate the oxidation reaction of the reducing ions.
  • the added acid is neutralized by means of a base so as to find a slightly basic ph, that is to say a ph between 8 and 9.
  • These effluents can then undergo either a treatment evaporation, either a precipitation treatment of insoluble salts in order to obtain sludge or concentrates of radioelements.
  • This sludge can then be coated in a coating material such as bitumen.
  • the oxidation according to the invention of the reducing ions such as the nitrites, ferrous or sulphite ions makes it possible to avoid exothermic reactions or significant gas evolution, resulting from the presence of both reducing ions and oxidizing ions.
  • N is the normality of these effluents.
  • the transformation of the reducing ions is done by adding to the effluents, in stoichiometric proportions, an oxidizing product such as sodium hypochlorite NaClO or potassium permanganate KMnO 4 .
  • an oxidizing product such as sodium hypochlorite NaClO or potassium permanganate KMnO 4 .
  • the first example relates to an effluent containing in particular nitrite ions.
  • composition of this effluent is given in the table below:
  • the second example relates to an effluent containing in particular ferrous ions.
  • the composition of this effluent is given in the table below:
  • the gas evolution is reduced to less than 0.1 N cm 3 / g if all the ferrous ions have been oxidized, before coating, in accordance with the invention.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
EP81401445A 1980-09-19 1981-09-16 Verfahren zum Aufarbeiten von Reduktionsmittel enthaltenden radioaktiven Abfall-Lösungen Withdrawn EP0048668A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8020189 1980-09-19
FR8020189A FR2490865A1 (fr) 1980-09-19 1980-09-19 Procede de traitement, avant bitumage, de solutions ou suspensions renfermant des ions reducteurs

Publications (2)

Publication Number Publication Date
EP0048668A2 true EP0048668A2 (de) 1982-03-31
EP0048668A3 EP0048668A3 (de) 1982-07-14

Family

ID=9246092

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401445A Withdrawn EP0048668A3 (de) 1980-09-19 1981-09-16 Verfahren zum Aufarbeiten von Reduktionsmittel enthaltenden radioaktiven Abfall-Lösungen

Country Status (2)

Country Link
EP (1) EP0048668A3 (de)
FR (1) FR2490865A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802755A1 (de) * 1988-01-30 1989-08-10 Kernforschungsanlage Juelich Verfahren zur einlagerung von radioaktiven abfallstoffen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE838533A (fr) * 1976-02-13 1976-05-28 Procede de sechage des solutions contenant de l'acide borique
DE2910034C2 (de) * 1979-03-14 1985-02-28 Kraftwerk Union AG, 4330 Mülheim Verfahren zur Aufbereitung radioaktiver Lösungen

Also Published As

Publication number Publication date
FR2490865A1 (fr) 1982-03-26
EP0048668A3 (de) 1982-07-14

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Effective date: 19841010

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Inventor name: AROD, JEAN

Inventor name: CORPEL, JACQUES