JPH0724479A - Treatment of waste water - Google Patents
Treatment of waste waterInfo
- Publication number
- JPH0724479A JPH0724479A JP17526093A JP17526093A JPH0724479A JP H0724479 A JPH0724479 A JP H0724479A JP 17526093 A JP17526093 A JP 17526093A JP 17526093 A JP17526093 A JP 17526093A JP H0724479 A JPH0724479 A JP H0724479A
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- treated
- cod
- wastewater
- reducing
- 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.)
- Pending
Links
Landscapes
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は排水処理に関し、特に還
元性物質を含有する産業排水を浄化するための方法に関
するものであり、特に高ＣＯＤ産業排水における迅速か
つ簡便なＣＯＤ低減処理方法を特徴とする排水処理方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wastewater treatment, and more particularly to a method for purifying industrial wastewater containing reducing substances, which is characterized by a rapid and simple COD reduction treatment method for high COD industrial wastewater. The wastewater treatment method.
【０００２】[0002]
【従来の技術】発電プラントの給水配管および軸受冷却
水系統には還元性の防錆剤としてヒドラジン（Ｎ
2 Ｈ4 ）あるいは亜硝酸ナトリウム（ＮａＮＯ2 ）が通
常使用されている。このため、これらプラント使用溶液
のような高ＣＯＤ排水の排出の際には公害防止条例等で
定められた一定水質以上への浄化処理が必要となる。2. Description of the Related Art Hydrazine (N) is used as a reducing rust preventive agent in power supply pipes and bearing cooling water systems of power plants.
2 H 4 ) or sodium nitrite (NaNO 2 ) is usually used. For this reason, when discharging high-COD waste water such as the solution used in these plants, it is necessary to purify it to a certain water quality or higher as determined by the pollution prevention regulations.
【０００３】従来、このような排水のＣＯＤ処理方法と
しては、次亜塩素酸ナトリウム（ＮａＯＣｌ）を添加す
る処理を行ったり、あるいはＮ2 Ｈ4 とＮａＮＯ2 とを
二つの槽に分離して、それぞれ異なる薬品で処理する方
法が採用されている。Conventionally, as a COD treatment method for such waste water, a treatment of adding sodium hypochlorite (NaOCl) has been carried out, or N 2 H 4 and NaNO 2 have been separated into two tanks. The method of treating with different chemicals is adopted.
【０００４】[0004]
【発明が解決しようとする課題】従来行われている方
法、たとえばＮａＯＣｌを添加する処理方法において
は、その添加量の制御が繁雑であり、添加量が過剰にな
ると添加したＮａＯＣｌから遊離塩素が生成し、これが
排水中に不可避的に残留するという問題がある。そのた
め、ＣＯＤを低く保つことが困難となる。また、ＮａＯ
Ｃｌの反応時間は比較的長く、さらに上記のように残留
塩素の生成の問題があるため、一度に多量のＮａＣＯｌ
を添加できないことから、結局、処理を迅速に行うこと
は困難である。In the conventional method, for example, the treatment method of adding NaOCl, the control of the addition amount is complicated, and when the addition amount becomes excessive, free chlorine is generated from the added NaOCl. However, there is a problem that this inevitably remains in the wastewater. Therefore, it becomes difficult to keep COD low. In addition, NaO
Since the reaction time of Cl is relatively long and there is a problem of residual chlorine formation as described above, a large amount of NaCO
In the end, it is difficult to carry out the treatment promptly, since it is impossible to add.
【０００５】一方、ＮａＣＯｌを使用しない方法におい
ては、Ｎ2 Ｈ4 ならびにＮａＮＯ2成分を各々別個の排
水槽に分類し、異なる薬品処理を施す必要があり、排水
処理工程が繁雑かつ長時間化するという問題がある。On the other hand, in the method which does not use NaCOl, it is necessary to classify the N 2 H 4 and NaNO 2 components into separate drainage tanks and carry out different chemical treatments, which makes the wastewater treatment process complicated and long. There is a problem.
【０００６】本発明は上述した従来技術の問題点に鑑み
てなされたものであって、ヒドラジン、亜硝酸ナトリウ
ムなどの還元性物質を含有する高ＣＯＤ産業排水におけ
る迅速かつ簡便なＣＯＤ低減処理方法を提供することを
目的とするものである。The present invention has been made in view of the above-mentioned problems of the prior art, and provides a rapid and simple COD reduction treatment method for high COD industrial wastewater containing a reducing substance such as hydrazine and sodium nitrite. It is intended to be provided.
【０００７】[0007]
【課題を解決するための手段】本発明による排水処理方
法は、還元性の防錆剤のような還元性物質を含有する高
ＣＯＤ（化学的酸素消費量）の産業用排水を処理するに
際し、被処理排水を過酸化水素水によって処理し被処理
排水のｐＨを低下させる工程を含むことを特徴とするも
のである。The method for treating wastewater according to the present invention, in treating industrial wastewater having a high COD (chemical oxygen consumption) containing a reducing substance such as a reducing rust preventive agent, The method is characterized by including a step of treating the wastewater to be treated with hydrogen peroxide water to reduce the pH of the wastewater to be treated.
【０００８】以下、本発明を好ましい具体例にしたがっ
て詳細に説明する。The present invention will be described in detail below with reference to preferred embodiments.
【０００９】図１は本発明による排水処理工程の一例を
示すフローチャート図である。図示のように、通常、防
錆剤であるヒドラジン（Ｎ2 Ｈ4 ）ならびに亜硝酸ナト
リウム（ＮａＮＯ2 ）を含有する発電プラントの給水配
管および軸受冷却水系廃液を処理槽へ一時的に貯留し、
これにＨ2 Ｏ2 を添加して、処理溶液のｐＨをｐＨ２．
５以下とする。この処理によって、亜硝酸ナトリウム
（ＮａＮＯ2 ）が有するＣＯＤ低減化のための反応が生
じる。FIG. 1 is a flow chart showing an example of a wastewater treatment process according to the present invention. As shown in the figure, usually, the water supply pipe and bearing cooling water system waste liquid of a power plant containing hydrazine (N 2 H 4 ) and sodium nitrite (NaNO 2 ) which are rust preventives are temporarily stored in a treatment tank,
H 2 O 2 was added thereto to adjust the pH of the treatment solution to pH 2.
It should be 5 or less. This treatment causes a reaction of sodium nitrite (NaNO 2 ) for reducing COD.
【００１０】上記の反応に際しては、反応触媒として硫
酸銅のような金属硫酸塩を添加することが好ましい。In the above reaction, it is preferable to add a metal sulfate such as copper sulfate as a reaction catalyst.
【００１１】本発明においては、さらに主として残留ヒ
ドラジン成分を処理するために、上記処理物に対して、
適宜攪拌を行いながら、水酸化ナトリウムなどのｐＨを
上昇させるアルカリ性化成分を添加して、ｐＨを１１．
５に上昇させる。In the present invention, in order to mainly treat the residual hydrazine component, the above treated product is
While appropriately agitating, add an alkalizing component such as sodium hydroxide that raises the pH to adjust the pH to 11.
Increase to 5.
【００１２】[0012]
【作用】このように、本発明による方法においてはＮ2
Ｈ4 やＮａＮＯ2 のような還元性成分を残留化学種とし
て含有する排水のＣＯＤ処理に際して、Ｈ2 Ｏ2 を加え
てｐＨを低下させる処理を含むことによって、Ｎ2 Ｈ4
およびＮａＮＯ2 を分解し、これによりＣＯＤを迅速に
低減化することが可能となる。したがって、単一の処理
槽において迅速かつ連続的なＣＯＤ低減化処理が可能と
なる。Thus, in the method according to the present invention, N 2
In COD treatment of wastewater containing a reducing component such as H 4 and NaNO 2 as residual chemical species, N 2 H 4 is added by including treatment for reducing pH by adding H 2 O 2.
And NaNO 2 are decomposed, which makes it possible to rapidly reduce COD. Therefore, COD reduction treatment can be performed quickly and continuously in a single treatment tank.
【００１３】[0013]
【実施例】バブリング装置を有する排水槽にて約４０μ
ｇ／ｌ濃度のＮ2 Ｈ4 水溶液のＣＯＤ低減化処理を行な
った。ここで、この被処理液中にはＮａＮＯ2 を含む廃
液が残留しておりＮ2 Ｈ4 ＋ＮａＮＯ2 混合廃液とし
て、図１と同様の方法に従ってＣＯＤ処理を実施した。Example: About 40μ in a drainage tank with a bubbling device
COD reduction treatment was performed on an aqueous N 2 H 4 solution having a concentration of g / l. Here, the waste liquid containing NaNO 2 remained in this liquid to be treated, and COD treatment was carried out as a mixed waste liquid of N 2 H 4 + NaNO 2 according to the same method as in FIG.
【００１４】下記表−１に処理前、処理後の水質結果を
示す。表から明らかなように、処理後ではその過程で有
害成分を発生することなく、ＮａＯＣｌの処理では１０
μｇ／ｌ前後までした低減できなかったＣＯＤも約６μ
ｇ／ｌ以下となり、処理時間についても３００ｍ3 当り
１〜２日間かかっていたものが約６時間の短時間でＣＯ
Ｄ低減化処理することが可能となった。Table 1 below shows water quality results before and after treatment. As is clear from the table, no harmful components were generated in the process after the treatment, and 10
COD that could not be reduced to around μg / l was about 6μ
It was less than g / l, and the processing time was about 1 to 2 days per 300 m 3, but CO was short in about 6 hours.
D reduction processing has become possible.
【００１５】[0015]
【表１】 ＊約７５０ｍ3 の廃水を約３００ｍ3 処理槽を用いて３
日間に分けて処理を行った。[Table 1] * Approximately 750 m 3 of wastewater is processed in a 300 m 3 treatment tank.
The treatment was divided into days.
【００１６】[0016]
【発明の効果】本発明の方法によれば、従来、次亜塩素
酸ナトリウムの添加により長時間かつ繁雑な処理により
ＣＯＤ低減化処理していた廃液、あるいはＮ2 Ｈ4 処理
用およびＮａＮＯ2 処理用の２槽に分離した繁雑な処理
が必要であった廃液を、迅速かつ簡便に処理することが
可能となる。EFFECTS OF THE INVENTION According to the method of the present invention, a COD-reducing waste liquid, which has been conventionally treated by adding sodium hypochlorite for a long time and complicated treatment, or N 2 H 4 treatment and NaNO 2 treatment is used. It becomes possible to quickly and simply treat the waste liquid that has been required to be complicatedly treated and separated into two tanks for use.
【図１】本発明による排水処理工程の一例を示すフロー
チャート図。FIG. 1 is a flowchart showing an example of a wastewater treatment process according to the present invention.
Claims (2)
する高ＣＯＤ（化学的酸素消費量）の産業用排水を処理
するに際し、被処理排水を過酸化水素水によって処理し
被処理排水のｐＨを低下させる工程を含むことを特徴と
する排水処理方法。1. When treating industrial wastewater having a high COD (chemical oxygen consumption) containing a reducing substance such as a reducing rust preventive agent, the wastewater to be treated is treated with hydrogen peroxide solution and treated. A wastewater treatment method comprising the step of lowering the pH of the treated wastewater.
さらにｐＨを上昇させる処理を含む、請求項１に記載の
方法。2. After the treatment with the hydrogen peroxide solution,
The method according to claim 1, further comprising a treatment for increasing pH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17526093A JPH0724479A (en) | 1993-07-15 | 1993-07-15 | Treatment of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17526093A JPH0724479A (en) | 1993-07-15 | 1993-07-15 | Treatment of waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0724479A true JPH0724479A (en) | 1995-01-27 |
Family
ID=15993054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17526093A Pending JPH0724479A (en) | 1993-07-15 | 1993-07-15 | Treatment of waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0724479A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1152094A (en) * | 1997-07-30 | 1999-02-26 | Mitsubishi Heavy Ind Ltd | Method for treating drain containing ethanolamine |
| DE102007036617A1 (en) * | 2007-08-02 | 2009-02-05 | Epc Engineering Consulting Gmbh | Process for the safe and efficient degradation of hydrazine and hydrazine sulfate |
-
1993
- 1993-07-15 JP JP17526093A patent/JPH0724479A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1152094A (en) * | 1997-07-30 | 1999-02-26 | Mitsubishi Heavy Ind Ltd | Method for treating drain containing ethanolamine |
| DE102007036617A1 (en) * | 2007-08-02 | 2009-02-05 | Epc Engineering Consulting Gmbh | Process for the safe and efficient degradation of hydrazine and hydrazine sulfate |
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