JPH0772297A - Method for treating radioactive supersonic cleaning fluid - Google Patents
Method for treating radioactive supersonic cleaning fluidInfo
- Publication number
- JPH0772297A JPH0772297A JP5246399A JP24639993A JPH0772297A JP H0772297 A JPH0772297 A JP H0772297A JP 5246399 A JP5246399 A JP 5246399A JP 24639993 A JP24639993 A JP 24639993A JP H0772297 A JPH0772297 A JP H0772297A
- Authority
- JP
- Japan
- Prior art keywords
- radioactive
- supersonic cleaning
- membrane
- ultrasonic cleaning
- waste fluid
- 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.)
- Granted
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、放射性超音波洗浄廃液
の処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating radioactive ultrasonic cleaning waste liquid.
【０００２】[0002]
【従来の技術】従来、原子力発電所で用いられたバルブ
等の配管部品、あるいは、形状が複雑な機械部品や工具
類等の除染は、酸化剤や還元剤を用いる所謂、化学的洗
浄により行われていたが、昨今、二次廃棄物の発生量が
少なく、かつ、被洗浄物を劣化させる恐れが小さいとい
った利点を有していること等からして、ブラッシング、
高圧ジェット若しくは超音波等による所謂、物理的洗浄
による除染が注目されるようになった。2. Description of the Related Art Conventionally, decontamination of piping parts such as valves used in nuclear power plants, or mechanical parts and tools having complicated shapes is carried out by so-called chemical cleaning using an oxidizing agent or a reducing agent. However, recently, since the amount of secondary waste generated is small and the risk of deteriorating the object to be cleaned is small, etc., brushing,
So-called physical decontamination using high-pressure jets or ultrasonic waves has come to the fore.
【０００３】特に、超音波洗浄に関し、洗浄液中からの
脱気及び洗浄液の層流化等により、超音波の音圧が飛躍
的に高められ、これに基いて、従来の一般的な超音波洗
浄では困難とされていた、形状が複雑な被洗浄物につい
ても効果的に洗浄し得るようになって、その応用分野が
次第に広げられ、原子力発電所で用いられたバルブ等の
除染に対しても、採用が検討されるようになった。In particular, regarding ultrasonic cleaning, the sound pressure of ultrasonic waves is dramatically increased by degassing from the cleaning liquid and laminar flow of the cleaning liquid. Based on this, conventional general ultrasonic cleaning is performed. However, it became possible to effectively clean objects to be cleaned that have complicated shapes, and the field of application was gradually expanded to decontaminate the valves used in nuclear power plants. Also, adoption has come to be considered.
【０００４】[0004]
【発明が解決しようとする課題】しかし、その一方にお
いて、かかる除染においては、化学的洗浄による除染の
場合と異なった液質の放射性超音波洗浄廃液が発生する
ので、この廃液特有の処理技術の開発が必要とされてい
た。On the other hand, on the other hand, in such decontamination, since a radioactive ultrasonic cleaning waste liquid having a liquid quality different from that in the case of decontamination by chemical cleaning is generated, a treatment peculiar to this waste liquid is generated. Development of technology was needed.
【０００５】本発明は、このような背景の下において発
明されたものであり、放射性超音波洗浄廃液の中和、精
密濾過、逆浸透膜処理及び脱気膜処理の有機的結合によ
り、放射性超音波洗浄廃液中から汚染物質を効果的に分
離し得て脱気膜の目詰りや放射能の蓄積を防止しながら
処理することができることを見出したのである。The present invention has been invented under such a background, and the radioactive supersonic cleaning waste solution is neutralized, microfiltered, reverse osmosis membrane treatment and degassing membrane treatment are organically combined to form a radioactive supersonic membrane. It has been found that contaminants can be effectively separated from the sonic cleaning waste liquid and can be treated while preventing clogging of the degassing membrane and accumulation of radioactivity.
【０００６】[0006]
【課題を解決するための手段】すなわち、本発明に係る
放射性超音波洗浄廃液の処理方法は、放射性超音波洗浄
廃液を中和して精密濾過した後、逆浸透膜処理し、次い
で、その透過液を脱気膜処理することを特徴とするもの
である。Means for Solving the Problems That is, a method for treating a radioactive ultrasonic cleaning waste liquid according to the present invention is a method in which the radioactive ultrasonic cleaning waste liquid is neutralized and microfiltered, then subjected to reverse osmosis membrane treatment, and then permeation thereof. It is characterized in that the liquid is subjected to a degassing membrane treatment.
【０００７】[0007]
【実施例】以下、本発明に係る実施例について述べる
と、図１において、超音波洗浄槽１から抜き出された放
射性超音波洗浄廃液に、ＮａＯＨ、ＫＯＨ、Ｃａ（Ｏ
Ｈ）2等のアルカリ２が所定量添加され、放射性超音波
洗浄廃液が中和、すなわち、放射性超音波洗浄廃液中の
酸、イオンが中和される。なお、アルカリ添加は、滴下
法、インラインミキサーによる混合法等、いかなる方法
であってもよい。EXAMPLES Examples of the present invention will be described below. In FIG. 1, the radioactive ultrasonic cleaning waste liquid extracted from the ultrasonic cleaning tank 1 contains NaOH, KOH, Ca (O).
H) 2 or the like is added in a predetermined amount to neutralize the radioactive ultrasonic cleaning waste liquid, that is, the acids and ions in the radioactive ultrasonic cleaning waste liquid are neutralized. The alkali may be added by any method such as a dropping method and a mixing method using an in-line mixer.
【０００８】続いて、中和された放射性超音波洗浄廃液
が精密濾過器３に送られて濾過されるが、この濾過器３
は、複数のポリアクリロニトリル、ポリオレフィン等の
有機高分子製中空糸を装着している。その為、ここで、
放射性汚染物質の微粒子が除去される。Subsequently, the neutralized radioactive ultrasonic cleaning waste liquid is sent to the microfilter 3 and filtered.
Is equipped with a plurality of organic polymer hollow fibers such as polyacrylonitrile and polyolefin. Therefore, here,
Fine particles of radioactive pollutants are removed.
【０００９】続いて、放射性汚染物質の微粒子が除去さ
れた放射性超音波洗浄廃液が、図示されていない貯槽へ
送られて貯留されると共に、その必要量が、ここから抜
き出されて図示されていないポンプで逆浸透膜装置４に
加圧供給され、脱塩される。その際の塩除去率は９５％
〜９９％である。なお、逆浸透膜装置４は、架橋アラミ
ド、ポリアミド、酢酸セルロース等の有機高分子製逆浸
透膜を装着している。また、得られた透過液は、中空糸
状気体透過膜を装着している脱気膜装置５に送られて脱
気された後、超音波洗浄槽１へ循環される。Subsequently, the radioactive ultrasonic cleaning waste liquid from which the fine particles of the radioactive pollutant have been removed is sent to a storage tank (not shown) and stored therein, and the required amount thereof is extracted from this storage tank and shown in the drawing. The reverse osmosis membrane device 4 is pressurized and supplied with a pump to desalt. The salt removal rate at that time is 95%
~ 99%. The reverse osmosis membrane device 4 is equipped with a reverse osmosis membrane made of an organic polymer such as crosslinked aramid, polyamide and cellulose acetate. Further, the obtained permeated liquid is sent to the degassing membrane device 5 equipped with a hollow fiber gas permeable membrane to be degassed, and then circulated to the ultrasonic cleaning tank 1.
【００１０】かかる廃液処理において、液中の放射性汚
染物質は、大部分が直径が０．１μｍ以上の微粒子であ
る為、これが脱気膜面に達すると、膜面に沈着して脱気
膜の目詰り及び放射能の蓄積を招く恐れがあると共に、
脱気膜は一般に有機高分子製であるから、放射能劣化を
生ずる恐れがある。そこで、脱気膜処理の前段におい
て、精密濾過及び逆浸透膜処理を行っている。In such waste liquid treatment, most of the radioactive pollutants in the liquid are fine particles having a diameter of 0.1 μm or more. Therefore, when they reach the degassing membrane surface, they are deposited on the membrane surface to form the degassing membrane. It may cause clogging and accumulation of radioactivity,
Since the degassing film is generally made of an organic polymer, there is a risk that radioactivity will deteriorate. Therefore, microfiltration and reverse osmosis membrane treatment are performed before the degassing membrane treatment.
【００１１】また、精密濾過に用いる濾過材は、それの
目詰り及び放射能の蓄積を防止する為に、逆洗を繰り返
すのが好ましく、かつ、逆洗を良好に行う為には、前記
微粒子の最小径、すなわち、０．１μｍの１０分の１以
下の細孔を有するものを選択するのが好ましい。放射性
汚染物質の模擬物質として、ＣｅＯ2 、ＨｆＯ2 を用
い、両模擬物質の夫々が１２０ｐｐｍの液を、０．５Ｋ
ｇ／ｃｍ2 で濾過したところ、透過液量の平均は０．０
８ｍ3 ／ｍ2 ・ｈｒで、透過液量のＳＳは零（検出限界
以下）であった。Further, the filter material used for microfiltration is preferably backwashed repeatedly in order to prevent clogging and accumulation of radioactivity, and in order to carry out good backwashing, the fine particles are used. It is preferable to select one having a minimum diameter of 1 μm, that is, pores having a diameter of 1/10 or less of 0.1 μm. CeO 2 and HfO 2 were used as the radioactive pollutant simulating substances.
When filtered with g / cm 2 , the average amount of permeated liquid was 0.0
At 8 m 3 / m 2 · hr, SS of the amount of permeated liquid was zero (below the detection limit).
【００１２】なお、使用済の濾過材は、放射性廃棄物と
して処分する必要があるから、焼却し得る可燃性のもの
を選択するのが好ましい。また、逆浸透膜処理に関し、
塩（ＨａＮＯ3 ）の排除は、低濃度で、かつ処理圧力が
高い方が有利であるが、１段の処理では、塩を完全に排
除するのが困難であるから、多段に処理するのが好まし
く、２段の処理では９９％以上が排除され、かつ、３段
の処理では、Ｎａイオン、ＮＯ3 イオン、Ｃｌイオン、
ＳＯ4 イオン等、全てのイオンを排除することができ
る。Since the used filter medium needs to be disposed of as radioactive waste, it is preferable to select a combustible and combustible filter medium. Regarding reverse osmosis membrane treatment,
It is advantageous to remove the salt (HaNO 3 ) at a low concentration and at a high processing pressure, but it is difficult to completely remove the salt in a single-step treatment, so it is preferable to perform a multi-step treatment. Preferably, 99% or more is eliminated in the two-step treatment, and Na ions, NO 3 ions, Cl ions,
It is possible to exclude all ions such as SO 4 ions.
【００１３】[0013]
【発明の効果】上述の如く、本発明によると、放射性超
音波洗浄廃液中から汚染物質を効果的に分離し得て脱気
膜の目詰りや放射能の蓄積を防止しながら処理すること
ができる。As described above, according to the present invention, contaminants can be effectively separated from the radioactive ultrasonic cleaning waste liquid, and the treatment can be performed while preventing clogging of the degassing membrane and accumulation of radioactivity. it can.
【図面の簡単な説明】[Brief description of drawings]
【図１】放射性超音波洗浄廃液の処理フローを示す図で
ある。FIG. 1 is a diagram showing a processing flow of a radioactive ultrasonic cleaning waste liquid.
１ 超音波洗浄槽 ２ アルカリ ３ 精密濾過器 ４ 逆浸透膜装置 ５ 脱気膜装置 1 Ultrasonic cleaning tank 2 Alkaline 3 Microfiltration device 4 Reverse osmosis membrane device 5 Degassing membrane device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０２Ｆ 1/44 ＺＡＢ Ｅ 8014−4Ｄ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location C02F 1/44 ZAB E 8014-4D
Claims (1)
過した後、逆浸透膜処理し、次いで、その透過液を脱気
膜処理することを特徴とする放射性超音波洗浄廃液の処
理方法。1. A method for treating a radioactive ultrasonic cleaning waste liquid, which comprises neutralizing the radioactive ultrasonic cleaning waste liquid, performing microfiltration, then performing a reverse osmosis membrane treatment, and then subjecting the permeated liquid to a degassing membrane treatment. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5246399A JP2807856B2 (en) | 1993-09-06 | 1993-09-06 | Treatment method for radioactive ultrasonic cleaning waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5246399A JP2807856B2 (en) | 1993-09-06 | 1993-09-06 | Treatment method for radioactive ultrasonic cleaning waste liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0772297A true JPH0772297A (en) | 1995-03-17 |
| JP2807856B2 JP2807856B2 (en) | 1998-10-08 |
Family
ID=17147938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5246399A Expired - Fee Related JP2807856B2 (en) | 1993-09-06 | 1993-09-06 | Treatment method for radioactive ultrasonic cleaning waste liquid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2807856B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001324593A (en) * | 2000-05-18 | 2001-11-22 | Japan Organo Co Ltd | Radioactive waste treatment system for boiling water type nuclear power plant |
| CN103958721A (en) * | 2011-09-30 | 2014-07-30 | 阿海珐核能公司 | Process for producing a wear-resistant and corrosion-resistant stainless steel part for a nuclear reactor, corresponding part and corresponding control cluster |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0225096U (en) * | 1988-08-03 | 1990-02-19 | ||
| JPH0448267U (en) * | 1990-08-24 | 1992-04-23 | ||
| JPH0474580U (en) * | 1990-11-06 | 1992-06-30 |
-
1993
- 1993-09-06 JP JP5246399A patent/JP2807856B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0225096U (en) * | 1988-08-03 | 1990-02-19 | ||
| JPH0448267U (en) * | 1990-08-24 | 1992-04-23 | ||
| JPH0474580U (en) * | 1990-11-06 | 1992-06-30 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001324593A (en) * | 2000-05-18 | 2001-11-22 | Japan Organo Co Ltd | Radioactive waste treatment system for boiling water type nuclear power plant |
| CN103958721A (en) * | 2011-09-30 | 2014-07-30 | 阿海珐核能公司 | Process for producing a wear-resistant and corrosion-resistant stainless steel part for a nuclear reactor, corresponding part and corresponding control cluster |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2807856B2 (en) | 1998-10-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |