EP0021911B1 - Procédé de traitement des effluents provenant de la décontamination de composants de réacteurs nucléaires et dispositif pour la mise en oeuvre de ce procédé - Google Patents
Procédé de traitement des effluents provenant de la décontamination de composants de réacteurs nucléaires et dispositif pour la mise en oeuvre de ce procédé Download PDFInfo
- Publication number
- EP0021911B1 EP0021911B1 EP80400790A EP80400790A EP0021911B1 EP 0021911 B1 EP0021911 B1 EP 0021911B1 EP 80400790 A EP80400790 A EP 80400790A EP 80400790 A EP80400790 A EP 80400790A EP 0021911 B1 EP0021911 B1 EP 0021911B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- effluent
- reactor
- hydrogen peroxide
- process according
- solution
- 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.)
- Expired
Links
- 238000005202 decontamination Methods 0.000 title claims description 23
- 230000003588 decontaminative effect Effects 0.000 title claims description 23
- 238000000034 method Methods 0.000 title claims description 17
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 20
- 238000011282 treatment Methods 0.000 claims description 17
- 239000007791 liquid phase Substances 0.000 claims description 9
- 239000002244 precipitate Substances 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
- 239000011651 chromium Substances 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 6
- 150000002815 nickel Chemical class 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229940075397 calomel Drugs 0.000 claims description 3
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical compound Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 230000002285 radioactive effect Effects 0.000 claims description 3
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000012670 alkaline solution Substances 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- 229910001430 chromium ion Inorganic materials 0.000 claims 1
- 229910001429 cobalt ion Inorganic materials 0.000 claims 1
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 claims 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(II) nitrate Inorganic materials [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 claims 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000010802 sludge Substances 0.000 description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000007788 liquid Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000005119 centrifugation Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001453 nickel ion Inorganic materials 0.000 description 2
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910021653 sulphate ion Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 102100028188 Cystatin-F Human genes 0.000 description 1
- 101710169749 Cystatin-F Proteins 0.000 description 1
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-BJUDXGSMSA-N manganese-54 Chemical compound [54Mn] PWHULOQIROXLJO-BJUDXGSMSA-N 0.000 description 1
- 150000001457 metallic cations Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000021962 pH elevation Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- -1 sulphate ions Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
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
Definitions
- the subject of the present invention is a method for treating effluents originating from the decontamination of components of nuclear reactors, such as those which result from the decontamination of metallic stainless steel parts. having stayed for a certain time in contact with the refrigerant fluid of a nuclear reactor, this fluid may consist of water or liquid sodium.
- chemical agents in solution are used in a known manner which make it possible to dissolve the active products thus deposited on the parts.
- the chemical agents used are variable in nature, but generally contain acids and / or bases in aqueous solution and are often supplemented by potassium permanganate which acts as an oxidizing agent.
- the composition of such a decontamination effluent is as follows:
- the chemical treatment of such an effluent must firstly aim at decontamination, which consists in passing the main part of the radioactivity into precipitates of sludge which are subsequently stored separately so as to be able to reject the phase liquid in nature, and, on the other hand, obtaining a good concentration of said sludge formed during the treatment of the effluent, that is to say a small volume of this sludge relative to the initial volume of the liquid effluent to be treated.
- the subject of the present invention is precisely a process for treating such decontamination effluents which makes it possible to obtain both satisfactory decontamination factors, a good concentration of the sludge to be stored and the rejection in nature of a liquid phase acceptable to the with regard to defined legal standards.
- This treatment process which applies to effluents which contain permanganate, phosphate and sulphate ions and radioactive ions of manganese, chromium and cobalt in solution, is essentially characterized in that it comprises the successive stages of reduction of permanganate ions by addition of hydrogen peroxide, alkalinization to a pH equal to or greater than 12, separation of the precipitate formed and final acidification of the remaining liquid phase to bring its pH to a value between 5.5 and 8 , 5, consistent with its release into the wild.
- the reduction of permanganate ions is carried out by hydrogen peroxide, generally at 100 volumes, which is added to the liquid phase until an adjustment of the potential is obtained.
- redox at a value close to 550 mV compared to a calomel electrode.
- the decontamination factors are improved by adding a nickel salt or a ferrous salt to the effluent after the addition of hydrogen peroxide and before alkalization.
- the nickel salt can be either S0 4 Ni sulfate or nitrate (Ni (NO 3 ) 2 , 6H 2 O; the ferrous salt used is most often S0 4 Fe, 7H sulfate 2 0.
- the present invention also relates to a device for implementing this method.
- the device for implementing the method is characterized in that it comprises a first tank communicating with a second tank, the two tanks being provided with stirring means, means for introducing into said first tank the liquid effluent to treating and the hydrogen peroxide, means for adjusting the oxidation-reduction potential of the effluent present in said tank to the desired value, means for introducing into said second tank a nickel salt and an alkaline solution, means to adjust the pH of the effluent present in said tank to the desired value, means for separating the precipitate formed from the effluent and for bringing it into a third tank provided with stirring means, means for introducing an acid solution into said third tank and means for adjusting the pH of the effluent to the desired value.
- This device is characterized in that the means for separating the precipitate formed are constituted by a centrifuge and by a filter.
- the hydrogen peroxide added is 100 volumes hydrogen peroxide and the amount used was 1.1 ml / l of solution. Alkalization at a pH above 12 was obtained using sodium hydroxide in an amount equal to 85 g / l of solution.
- Nickel is introduced in the form of a solution of nickel sulphate SO 4 Ni at 0.3 g / I.
- the following table gives, for each of the three radionuclides 54 Mn, 60 Co and 51 Cr, the activities in micro-curies / m 3 before and after the treatment. It can be seen that good decontamination factors are already obtained by treating hydrogen peroxide plus soda, but that these factors are still much improved if the nickel salt is added. A decontamination factor greater than 430 for manganese, greater than 15 for chromium and equal to 10 for cobalt is then obtained.
- the second example of implementation of the treatment method according to the invention relates to an effluent solution whose initial activity (indicated below) is clearly greater than the effluent activities of the previous example. It will be seen in the table below that the results obtained with regard to the decontamination factor are therefore much more spectacular.
- This effluent has the following chemical characteristics:
- the effluent solution was treated with the addition of hydrogen peroxide at 100 volumes at a dose of 1.5 ml / l of solution to reduce the permanganate ions; 0.3 g / l of nickel ion solution in the form of sulphate was then added and the medium was basified by adding 80 to 95 g / l of sodium hydroxide to obtain a pH equal to or greater than 12.
- This example relates to comparative experiments carried out with nickel and other metallic cations such as iron, copper, calcium or cobalt, in order to compare the decontamination factors obtained.
- the following table clearly shows the clear superiority of nickel over the other cations.
- 1.5 ml of oxygenated water was introduced at 100 volumes per liter of effluent and after addition of the metal salt, sodium hydroxide was added until a pH of 12 was obtained.
- a column called “total gamma” has been added to the specific decontamination factor for each of the three preceding radionuclides, corresponding to the overall decontamination of all the gamma emitters considered as a whole.
- FIG. 1 shows, under the conditions of the experiment corresponding to the penultimate line of the table above (300 mg / 1 of nickel ions) the influence of the pH of the solution, plotted on the abscissa on the factor of decontamination obtained for each of the three radionuclides contained in the starting effluent, namely 5 'Cr, 6 ° Co, and 54 Mn. It is obvious, when consulting this curve, that the maximum effect of pH on decontamination is located for a value of the latter equal to or greater than 12.
- the sludge formed by precipitation during chemical treatment is generally very divided and, given the high salinity of the treated effluent, they do not settle. Under these conditions, to obtain a true separation of the liquid and solid phases, use must be made of a filtration or preferably centrifugation operation, since the latter technique is much more effective due to the low cohesion of the sludge. Additional filtration eliminates fine particles that may have remained in suspension after centrifugation.
- the effluents are brought by a pipe 1 into a first tank 2 provided with an agitator 3.
- the hydrogen peroxide contained in a storage tank 5 is injected into the container 2, controlling at using a device per se known 6 the redox potential of this solution so as to bring it to the desired value, generally close to 550 mV relative to a calomel electrode.
- the effluents generally stay for a period of the order of 30 minutes in the tank 2.
- Line 7 then conducts the effluents in a second container 8 also fitted with an agitator 9 and into which is introduced via line 10 the nickel sulphate stored in container 11, and, via line 12 the sodium hydroxide stored in container 13 to bring the pH to a value equal to or greater than 12, which is checked using the probe 14.
- the effluent then passes through the pipe 15 in a buffer tank 16 before reaching the centrifuge 17 where the sludge separation takes place. by spin.
- the liquid effluent must still be filtered through the filter 23 to remove fine particles which would not have been completely separated by centrifugation; the pipe 24 then leads the liquid phase thus treated in a new tank 25 provided with an agitator and into which is introduced by a pipe 26 the quantity of acid (nitric or sulfuric) necessary coming from the storage container 27 to adjust the pH before rejection at a value compatible with current regulations and generally around 7. Control of the pH value is carried out by a probe 28 bypass on the tank 25. The final rejection can then take place by gravity at base 29 of container 25.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7915273 | 1979-06-14 | ||
| FR7915273A FR2459536A1 (fr) | 1979-06-14 | 1979-06-14 | Procede de traitement des effluents de decontamination, notamment de composants de reacteurs nucleaires et dispositif pour la mise en oeuvre de ce procede |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0021911A1 EP0021911A1 (fr) | 1981-01-07 |
| EP0021911B1 true EP0021911B1 (fr) | 1984-03-07 |
Family
ID=9226624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80400790A Expired EP0021911B1 (fr) | 1979-06-14 | 1980-06-03 | Procédé de traitement des effluents provenant de la décontamination de composants de réacteurs nucléaires et dispositif pour la mise en oeuvre de ce procédé |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4312758A (enrdf_load_stackoverflow) |
| EP (1) | EP0021911B1 (enrdf_load_stackoverflow) |
| JP (1) | JPS562885A (enrdf_load_stackoverflow) |
| CA (1) | CA1154180A (enrdf_load_stackoverflow) |
| DE (1) | DE3066814D1 (enrdf_load_stackoverflow) |
| ES (1) | ES492429A0 (enrdf_load_stackoverflow) |
| FR (1) | FR2459536A1 (enrdf_load_stackoverflow) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572797A (en) * | 1983-03-02 | 1986-02-25 | The United States Of America As Represented By The United States Department Of Energy | Method for removing trace pollutants from aqueous solutions |
| ATE140438T1 (de) * | 1989-05-09 | 1996-08-15 | Univ California | Verfahren und zusammensetzung zur behandlung von abwasser |
| US4983306A (en) * | 1989-05-09 | 1991-01-08 | The Regents Of The University Of California | Method of treating waste water |
| DE4313127A1 (de) * | 1993-04-22 | 1994-10-27 | Wismut Gmbh | Verfahren zur gleichzeitigen Fällung von Uran, Arsen und Radium aus bergbaulichen Abwässern |
| RU2234153C2 (ru) * | 2002-07-29 | 2004-08-10 | ФГУП "Производственное объединение "Маяк" | Способ переработки радиоактивных пульп и осадков соединений марганца (iv), (vi) |
| RU2250520C2 (ru) * | 2003-04-25 | 2005-04-20 | Открытое Акционерное Общество Сосновоборский Проектно-изыскательский институт "ВНИПИЭТ" (ОАО СПИИ "ВНИПИЭТ") | Способ очистки жидких радиоактивных отходов |
| RU2268513C1 (ru) * | 2004-12-28 | 2006-01-20 | Закрытое акционерное общество "РАОТЕХ" | Способ переработки жидких радиоактивных отходов |
| US9056784B2 (en) * | 2006-09-19 | 2015-06-16 | Ken V. Pandya | High efficiency water-softening process |
| US20100010285A1 (en) * | 2008-06-26 | 2010-01-14 | Lumimove, Inc., D/B/A Crosslink | Decontamination system |
| FR2937054B1 (fr) * | 2008-10-13 | 2010-12-10 | Commissariat Energie Atomique | Procede et dispositif de decontamination d'une surface metallique. |
| RU2465666C2 (ru) * | 2010-12-29 | 2012-10-27 | Александр Гаврилович Басиев | Способ переработки жидких радиоактивных отходов |
| RU2597242C1 (ru) * | 2015-04-13 | 2016-09-10 | Акционерное общество "Государственный научный центр Российской Федерации - Физико-энергетический институт имени А.И. Лейпунского" | Способ очистки жидких радиоактивных отходов от органических примесей |
| RU2641656C1 (ru) * | 2016-12-21 | 2018-01-19 | федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технический университет имени Н.Э. Баумана (национальный исследовательский университет)" (МГТУ им. Н.Э. Баумана) | Способ очистки жидких радиоактивных отходов и устройство для его осуществления |
| RU2654195C1 (ru) * | 2017-06-01 | 2018-05-17 | Общество с ограниченной ответственностью "РАОТЕХ" | Способ переработки жидких радиоактивных отходов |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA724706A (en) * | 1965-12-28 | H. Rice Archie | Process for clarifying water | |
| US2105835A (en) * | 1932-12-13 | 1938-01-18 | Katadyn Inc | Sterilizing liquid |
| US3013978A (en) * | 1959-09-15 | 1961-12-19 | Rosinski John | Removal of fission products from water |
| FR2031844A5 (en) * | 1969-02-10 | 1970-11-20 | Commissariat Energie Atomique | Decontamination of radioactive effluent - from irradiated nuclear fuel treatment |
| FR2067743A5 (en) * | 1969-11-14 | 1971-08-20 | Commissariat Energie Atomique | Decontamination of effluent liquids contng cesium 137 |
| JPS4811280B1 (enrdf_load_stackoverflow) * | 1970-11-09 | 1973-04-12 | ||
| US3716485A (en) * | 1971-01-11 | 1973-02-13 | Ayteks International Corp | Process and apparatus for destroying hexavalent chromium in solution |
| JPS49116854A (enrdf_load_stackoverflow) * | 1973-03-08 | 1974-11-08 | ||
| US3873362A (en) * | 1973-05-29 | 1975-03-25 | Halliburton Co | Process for cleaning radioactively contaminated metal surfaces |
| JPS5132057A (en) * | 1974-09-13 | 1976-03-18 | Toa Gosei Chem Ind | Haisui no shorihoho |
| DE2613128C2 (de) * | 1976-03-27 | 1982-03-04 | Hoechst Ag, 6000 Frankfurt | Verfahren zur Verminderung des Quecksilbergehaltes von Betriebsabwässern |
| US4049545A (en) * | 1976-07-08 | 1977-09-20 | Rocky Carvalho | Chemical waste water treatment method |
| DE2723025C3 (de) * | 1977-05-21 | 1980-03-13 | Rheinisch-Westfaelisches Elektrizitaetswerk Ag, 4300 Essen | Verfahren zum Aufbereiten von Borsäure, radioaktives Antimon und weitere radioaktive Nuklide enthaltendem Abwasser |
| DE2724954C2 (de) * | 1977-06-02 | 1984-11-15 | Reaktor-Brennelement Union Gmbh, 6450 Hanau | Verfahren zur Dekontamination von alpha- und beta-aktivem Prozeßwasser |
-
1979
- 1979-06-14 FR FR7915273A patent/FR2459536A1/fr active Granted
-
1980
- 1980-06-03 EP EP80400790A patent/EP0021911B1/fr not_active Expired
- 1980-06-03 DE DE8080400790T patent/DE3066814D1/de not_active Expired
- 1980-06-09 US US06/157,786 patent/US4312758A/en not_active Expired - Lifetime
- 1980-06-11 JP JP7887880A patent/JPS562885A/ja active Granted
- 1980-06-12 CA CA000353869A patent/CA1154180A/en not_active Expired
- 1980-06-13 ES ES492429A patent/ES492429A0/es active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| US4312758A (en) | 1982-01-26 |
| DE3066814D1 (en) | 1984-04-12 |
| EP0021911A1 (fr) | 1981-01-07 |
| ES8105115A1 (es) | 1981-05-16 |
| JPS6116957B2 (enrdf_load_stackoverflow) | 1986-05-02 |
| CA1154180A (en) | 1983-09-20 |
| ES492429A0 (es) | 1981-05-16 |
| FR2459536A1 (fr) | 1981-01-09 |
| FR2459536B1 (enrdf_load_stackoverflow) | 1983-10-28 |
| JPS562885A (en) | 1981-01-13 |
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