JP2001149954A - Device for treating chrome-containing waste water - Google Patents
Device for treating chrome-containing waste waterInfo
- Publication number
- JP2001149954A JP2001149954A JP33278799A JP33278799A JP2001149954A JP 2001149954 A JP2001149954 A JP 2001149954A JP 33278799 A JP33278799 A JP 33278799A JP 33278799 A JP33278799 A JP 33278799A JP 2001149954 A JP2001149954 A JP 2001149954A
- Authority
- JP
- Japan
- Prior art keywords
- chromium
- exchange resin
- anion exchange
- chrome
- containing wastewater
- 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
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Treatment Of Water By Ion Exchange (AREA)
- Physical Water Treatments (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は陰イオン交換樹脂に
よりクロム含有排水を脱イオン化する処理装置の改良に
係り、特にクロム含有排水中の３価クロム錯体を化学薬
品を使用することなく６価クロムに変換して陰イオン交
換樹脂からの溶離を容易にして処理水のリサイクル化を
可能とする改良技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a treatment apparatus for deionizing chromium-containing wastewater with an anion exchange resin, and more particularly, to a method for converting a trivalent chromium complex in a chromium-containing wastewater into a hexavalent chromium without using a chemical. The present invention relates to an improved technology which facilitates elution from an anion exchange resin by converting the treated water into recycled water.
【０００２】[0002]
【従来の技術】クロムメッキやクロメート処理などの金
属表面処理工程から排出される排水には、クロムイオン
が６価または３価の形で含まれる。６価クロムはＨ2Ｃr
Ｏ4、ＨＣrＯ4 -などの陰イオンの形で存在するので陰イ
オン交換樹脂に吸着除去することができる。クロム排水
中の３価クロムは含有量こそ少ないが、共存するＳＯ 4
2-イオンやＣl-イオンと作用して分子量の大きな３価ク
ロム錯体を形成しており、陰イオン交換樹脂で吸着除去
しようとしても、これに強固に付着するので再生時に溶
離しにくいという欠点がある。３価クロム錯体は、量的
には僅かでも陰イオン交換樹脂を長期間使用し脱イオン
と再生を繰り返していると樹脂表面に付着・蓄積して陰
イオン交換樹脂本来の機能を退化させる。しかし６価ク
ロムは陰イオン交換樹脂に容易に吸着し、溶離するので
樹脂による脱着処理が可能である。[Prior Art] Gold such as chrome plating and chromate treatment
The effluent discharged from the metal surface treatment process contains chromium ions
In a hexavalent or trivalent form. Hexavalent chromium is HTwoCr
OFour, HCrOFour -Since it exists in the form of anions such as
It can be adsorbed and removed by the on-exchange resin. Chrome drainage
Trivalent chromium in its content is low, but coexisting SO Four
2-Ion and Cl-Trivalent cations with large molecular weight acting on ions
Forming a rom complex, adsorbed and removed by anion exchange resin
Even if you try to do so, it will adhere
There is a disadvantage that it is difficult to separate. Trivalent chromium complex is quantitative
Deionize using a small amount of anion exchange resin for a long time
And regenerating, it adheres and accumulates on the resin surface and
Degrades the original function of the ion exchange resin. But six-valent
ROM easily adsorbs and elutes on anion exchange resin,
Desorption treatment with resin is possible.
【０００３】実際のクロム含有排水中には陰イオンの他
に、陽イオンも含まれるから、表面処理排水をイオン交
換樹脂で浄化するには、陽イオン交換樹脂塔と陰イオン
交換樹脂塔を直列に接続したイオン交換装置が用いられ
る。これにより、金属表面処理排水は脱イオン水として
再利用できる。表面処理排水のリサイクルに用いたイオ
ン交換樹脂は再生すれば繰り返し何回でも使える。通
常、陽イオン交換樹脂は塩酸、陰イオン交換樹脂は水酸
化ナトリウムで再生する。[0003] Since the actual chromium-containing wastewater contains cations in addition to anions, in order to purify the surface-treated wastewater with an ion exchange resin, a cation exchange resin tower and an anion exchange resin tower are connected in series. Is used. Thereby, the metal surface treatment wastewater can be reused as deionized water. The ion-exchange resin used to recycle surface treatment wastewater can be reused any number of times if it is regenerated. Usually, the cation exchange resin is regenerated with hydrochloric acid and the anion exchange resin with sodium hydroxide.
【０００４】陰イオン交換樹脂に吸着した６価クロムと
３価クロムのうち、６価クロムは水酸化ナトリウムに良
く溶けるので溶離できるが、３価クロムは溶解しにくい
ので、いつまでも樹脂表面にまつわりつくように付着し
て、脱イオン効果と再生効率の低下を招く原因となって
いた。[0004] Of hexavalent chromium and trivalent chromium adsorbed on the anion exchange resin, hexavalent chromium can be eluted because it is well dissolved in sodium hydroxide, but trivalent chromium is difficult to dissolve, so that it will remain attached to the resin surface forever. To reduce the deionization effect and regeneration efficiency.
【０００５】イオン交換樹脂を再生したときの溶離廃液
に含まれる重金属は中和・凝集処理し、６価クロムは還
元、中和後、スラッジとして埋め立て処分されていた。
廃液の中でも特に有害な６価クロムの還元には一般に硫
酸酸性下で亜硫酸水素ナトリウムが用いられ、下記反応
により６価から３価に還元される。 4H2CrO4＋6NaHSO3＋3H2SO4 → 2Cr2(SO4)3＋3Na2SO4＋10H2O （１） ６価クロム 還元剤 ３価クロム[0005] Heavy metals contained in the elution effluent when the ion exchange resin is regenerated are neutralized and agglomerated, and hexavalent chromium is reduced and neutralized, and then landfilled as sludge.
For the reduction of hexavalent chromium, which is particularly harmful among waste liquids, sodium bisulfite is generally used under sulfuric acidity, and is reduced from hexavalent to trivalent by the following reaction. 4H 2 CrO 4 + 6NaHSO 3 + 3H 2 SO 4 → 2Cr 2 (SO 4 ) 3 + 3Na 2 SO 4 + 10H 2 O (1) Hexavalent chromium reducing agent Trivalent chromium
【０００６】３価クロムは水酸化ナトリウムなどのアル
カリで中和すれば下記反応により水に不溶の水酸化クロ
ムＣr(OH)3となって析出する。 Cr2(SO4)3＋6NaOH → 2Cr(OH)3＋3Na2SO4 （２） ６価クロムは陰イオン交換樹脂にＨＣrＯ4 -の形で吸着
するが、排水中にはその他に塩化物イオン（Ｃl-）硝酸
イオン（ＮＯ3 -）、硫酸イオン（ＳＯ4 2-）なども混在
するので、これらの陰イオンも上記陰イオン交換樹脂に
吸着する。陰イオン交換樹脂の再生には水酸化ナトリウ
ムを用いるので、再生廃液には必然的に６価クロム、塩
化物イオン、硝酸イオン、硫酸イオン、アルカリ成分が
含まれる。When trivalent chromium is neutralized with an alkali such as sodium hydroxide, it is converted into water-insoluble chromium hydroxide Cr (OH) 3 by the following reaction and is precipitated. Cr 2 (SO 4) 3 + 6NaOH → 2Cr (OH) 3 + 3Na 2 SO 4 (2) 6 -valent chromium HCrO 4 anion exchange resin - adsorbs in the form of, other to the chloride ions in the waste water ( Since Cl − ) nitrate ion (NO 3 − ) and sulfate ion (SO 4 2− ) are also present, these anions are also adsorbed on the anion exchange resin. Since sodium hydroxide is used for regeneration of the anion exchange resin, the regeneration waste liquid necessarily contains hexavalent chromium, chloride ions, nitrate ions, sulfate ions, and alkali components.
【０００７】このように、クロム含有排水を陰イオン交
換樹脂で脱着処理してリサイクルしようとすると僅かに
含まれる３価クロム錯体に起因する陰イオン交換樹脂の
脱イオン効果の低下と樹脂の再生不良を招くので、化学
薬品を使わないで３価クロムを６価クロムに変換する技
術が望まれていた。化学薬品を使わない酸化処理は処理
水中のイオン量を増加させないのでイオン交換樹脂へ負
担をかけなくて済む。[0007] As described above, when the chromium-containing wastewater is desorbed with an anion exchange resin and recycled, the deionization effect of the anion exchange resin due to the trivalent chromium complex contained slightly is reduced and the resin regeneration is poor. Therefore, a technique for converting trivalent chromium to hexavalent chromium without using a chemical has been desired. Oxidation treatment without using chemicals does not increase the amount of ions in the treatment water, so that no burden is imposed on the ion exchange resin.
【０００８】[0008]
【発明が解決しようとする課題】表面処理工程から発生
する６価クロム含有排水は、陽イオン交換樹脂と陰イオ
ン交換樹脂に通水すれば脱イオン水としてリサイクルで
きる。飽和に達した陽イオン交換樹脂は５〜１０％程度
の塩酸溶液で再生する。陰イオン交換樹脂は５〜１０％
の水酸化ナトリウム溶液で再生すれば繰り返し利用でき
る。陰イオン交換樹脂には、表面処理排水中の６価クロ
ムイオン、３価クロム錯体、塩化物イオン、硝酸イオ
ン、硫酸イオンなどの陰イオンがすべて吸着する。この
うち、排水中に僅かに存在している３価クロム錯体は樹
脂に強固に付着して交換反応不良と、陰イオン交換樹脂
の再生不良の原因となるので、イオン交換樹脂処理する
前に６価クロムなどに変換できれば都合が良い。それに
は、後工程でイオン交換樹脂を使用する観点から、イオ
ン増加の直接原因となる化学薬品を使わない方法が望ま
しい。The wastewater containing hexavalent chromium generated from the surface treatment step can be recycled as deionized water by passing it through a cation exchange resin and an anion exchange resin. The saturated cation exchange resin is regenerated with a hydrochloric acid solution of about 5 to 10%. 5-10% anion exchange resin
It can be used repeatedly by regenerating with sodium hydroxide solution. The anion exchange resin adsorbs all anions such as hexavalent chromium ion, trivalent chromium complex, chloride ion, nitrate ion and sulfate ion in the surface treatment wastewater. Of these, the trivalent chromium complex slightly present in the wastewater strongly adheres to the resin and causes poor exchange reaction and poor regeneration of the anion exchange resin. It is convenient if it can be converted to chromium (valent). For this purpose, from the viewpoint of using an ion exchange resin in a subsequent step, a method that does not use a chemical agent that directly causes an increase in ions is desirable.
【０００９】クロム含有排水中の３価クロムが化学薬品
を使わないで６価クロムに変換できる方法が見出せれ
ば、排水のリサイクル化における３価クロム錯体由来の
イオン交換反応不良と再生不良の問題が解消され、イオ
ン交換樹脂によるクロム排水のリサイクルを効率良く行
うことができる。If a method capable of converting trivalent chromium in chromium-containing wastewater to hexavalent chromium without using chemicals can be found, the problem of poor ion exchange reaction and regeneration failure derived from trivalent chromium complex in wastewater recycling. And the chromium wastewater can be efficiently recycled by the ion exchange resin.
【００１０】本発明の目的は、クロム含有排水に含まれ
る少量の３価クロムを化学薬品を使わないで６価クロム
に変換して、陰イオン交換樹脂に対する吸着と溶離を順
調に進め、クロム排水のリサイクル化が効率良く行われ
る装置を提供することにある。An object of the present invention is to convert a small amount of trivalent chromium contained in a chromium-containing wastewater into hexavalent chromium without using a chemical, and to smoothly promote adsorption and elution to an anion exchange resin, and It is an object of the present invention to provide an apparatus in which the recycling of wastewater is performed efficiently.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するた
め、本発明のクロム含有排水処理装置は、クロム含有排
水に紫外線を照射しながらオゾンを作用させる第１の処
理手段と、第１の処理手段で処理されたクロム含有排水
を陰イオン交換樹脂によって脱イオン処理する第２の処
理手段と、を備えたことを要旨とする。In order to achieve the above object, a chromium-containing wastewater treatment apparatus according to the present invention comprises a first treatment means for applying ozone while irradiating ultraviolet rays to chromium-containing wastewater, and a first treatment means. And a second treatment means for deionizing the chromium-containing wastewater treated by the means with an anion exchange resin.
【００１２】本発明において、上記第１の処理手段が過
酸化水素をクロム含有排水に作用させるようになってい
ることを要旨とする。In the present invention, the gist of the present invention is that the first treatment means causes the hydrogen peroxide to act on the chromium-containing wastewater.
【００１３】また、上記各発明において、上記第１の処
理手段が冷却用空気を紫外線照射部に送るようにしても
よい。In each of the above inventions, the first processing means may send cooling air to an ultraviolet irradiation unit.
【００１４】[0014]
【発明の実施の形態】本発明の実施の形態における特徴
点は、クロム含有排水をイオン交換樹脂法で脱イオンす
る前に、樹脂吸着で障害となる３価クロムをクロム含有
排水に対する紫外線照射併用オゾン酸化（ＵＶオゾン酸
化と称する）により酸化処理し６価クロムに変換するこ
とである。クロム含有排水に低圧水銀ランプから発生す
る２５３．７ｎｍの紫外線を照射しながらオゾンを作用
させると酸化力の強いヒドロキシルラジカル（ＯＨ・）
が発生するので３価クロムは短時間のうちに６価クロム
に変わる。酸化力の強さを示す酸化還元電位を比較する
とヒドロキシルラジカル（ＯＨ・）２．８５ｍＶ、オゾ
ン（Ｏ3）２．０７ｍＶ、過酸化水素（Ｈ2Ｏ2）１．７
８ｍＶ、二酸化マンガン（ＭnＯ2）１．５１ｍＶ、塩素
（Ｃl2）１．３６ｍＶである。したがって、ＵＶオゾン
酸化法を適用すると化学薬品を使わないで３価クロムが
容易に６価クロムに変わる。このとき少量の過酸化水素
（Ｈ2Ｏ2）を添加すると酸化反応は更に促進される。過
酸化水素は分解生成物が水と酸素であるから多少過剰に
添加してもイオン交換樹脂に負荷をかけないという利点
がある。本手段により、クロム排水中に僅かに含まれる
３価クロムは容易に６価クロムに変換できるので、イオ
ン交換樹脂による脱イオン処理と樹脂の再生が効率良く
行え、クロム排水のリサイクル化が容易となる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The feature of the embodiment of the present invention is that, before deionizing chromium-containing wastewater by the ion-exchange resin method, trivalent chromium which is an obstacle to resin adsorption is combined with ultraviolet irradiation of chromium-containing wastewater. Oxidation by ozone oxidation (referred to as UV ozone oxidation) to convert to hexavalent chromium. When ozone is applied to chromium-containing wastewater while irradiating ultraviolet rays of 253.7 nm generated from a low-pressure mercury lamp, hydroxyl radical (OH.) With strong oxidizing power
Chromium is converted into hexavalent chromium in a short time. Comparing the oxidation-reduction potential indicating the strength of the oxidizing power, hydroxyl radical (OH.) 2.85 mV, ozone (O 3 ) 2.07 mV, hydrogen peroxide (H 2 O 2 ) 1.7
8 mV, manganese dioxide (MnO 2 ) 1.51 mV, and chlorine (Cl 2 ) 1.36 mV. Therefore, when the UV ozone oxidation method is applied, trivalent chromium is easily changed to hexavalent chromium without using a chemical. At this time, if a small amount of hydrogen peroxide (H 2 O 2 ) is added, the oxidation reaction is further promoted. Since hydrogen peroxide is a decomposition product of water and oxygen, hydrogen peroxide has the advantage of not imposing a load on the ion exchange resin even if added in a slightly excessive amount. By this means, trivalent chromium slightly contained in chromium effluent can be easily converted to hexavalent chromium, so that deionization treatment with ion exchange resin and resin regeneration can be performed efficiently, and recycling of chromium effluent is easy. Become.
【００１５】上述したように、本発明の特徴は、クロム
排水中に僅かに共存する３価クロムを化学薬品を使わず
にＵＶオゾン酸化法を適用して６価クロムに変換し、陰
イオン交換樹脂に強固に付着する３価クロム錯体の性質
を消滅させた点にある。更にＵＶオゾン酸化に少量の過
酸化水素を添加すれば酸化反応が促進されることも見出
している。過酸化水素の分解生成物は水と酸素であるか
らイオン交換樹脂に負担とならない。As described above, the feature of the present invention is that trivalent chromium slightly coexisting in chromium effluent is converted into hexavalent chromium by applying a UV ozone oxidation method without using chemicals, and anion exchange is performed. This is in that the property of the trivalent chromium complex that strongly adheres to the resin has been eliminated. Further, they have found that the oxidation reaction is promoted by adding a small amount of hydrogen peroxide to UV ozone oxidation. Since the decomposition products of hydrogen peroxide are water and oxygen, they do not burden the ion exchange resin.
【００１６】上記の方法によれば、クロム含有排水に含
まれる３価クロムは容易に６価クロムに変換されるの
で、イオン交換樹脂による脱イオンと再生処理が効率良
く行えるようになり、有害なクロム排水のリサイクル化
が容易となった。According to the above method, trivalent chromium contained in the chromium-containing wastewater is easily converted to hexavalent chromium, so that deionization and regeneration treatment with an ion-exchange resin can be performed efficiently, which is harmful. Recycling of chromium wastewater became easier.
【００１７】次に本発明の実施の形態の具体例を説明す
る。金属表面処理工程で発生したクロム含有排水（ｐＨ
７．８、電気伝導率１３５ｍＳ／ｍ）に２５３．７ｎｍ
の紫外線を照射しながらオゾンを作用させると３価クロ
ムは１時間程度で６価クロムに変わった。同様の排水に
過酸化水素を５０ｍｇ／Ｌ添加してＵＶオゾン酸化する
と３価クロムは３０分程度で６価クロムに変化した。Next, a specific example of the embodiment of the present invention will be described. Chromium-containing wastewater generated in the metal surface treatment process (pH
7.8, electric conductivity 135 mS / m) to 253.7 nm
When the ozone was applied while irradiating the ultraviolet rays, the trivalent chromium was changed to hexavalent chromium in about one hour. When 50 mg / L of hydrogen peroxide was added to the same waste water and UV ozone oxidation was performed, trivalent chromium changed to hexavalent chromium in about 30 minutes.
【００１８】ＵＶ酸化処理前の原水と過酸化水素添加Ｕ
Ｖオゾン酸化（３０分）後の排水組成を表１に示す。Raw water and hydrogen peroxide added before UV oxidation treatment
Table 1 shows the wastewater composition after V ozone oxidation (30 minutes).
【００１９】[0019]
【表１】 [Table 1]
【００２０】表１のＵＶオゾン酸化処理水（ｐＨ７．
２、電気伝導率１５０ｍＳ／ｍ）を陽イオン交換樹脂と
陰イオン交換樹脂を直列に接続した樹脂塔に通水したら
純度の高い脱イオン水（ｐＨ７．５、電気伝導率０．８
ｍＳ／ｍ）が得られた。この水は表面処理工程の水洗水
としてリサイクルできた。The UV ozone oxidized water shown in Table 1 (pH 7.
2. After passing an electric conductivity of 150 mS / m through a resin tower in which a cation exchange resin and an anion exchange resin are connected in series, high-purity deionized water (pH 7.5, electric conductivity 0.8)
mS / m). This water could be recycled as washing water in the surface treatment step.
【００２１】飽和に達した陽イオン交換樹脂（Ｈ型）は
約７％塩酸溶液で再生した。陰イオン交換樹脂（ＯＨ
型）は３価クロムがほぼ完全に６価クロムに変換されて
いるので、約１０％水酸化ナトリウム溶液で容易に再生
できた。再生廃液は濃度の高い部分を選んで採取した。
再生廃液のｐＨは１３．８の強アルカリ性を示し、下記
表２の組成であった。The saturated cation exchange resin (form H) was regenerated with an approximately 7% hydrochloric acid solution. Anion exchange resin (OH
(Type), trivalent chromium was almost completely converted to hexavalent chromium, so that it could be easily regenerated with about 10% sodium hydroxide solution. Recycling waste liquid was collected by selecting a portion having a high concentration.
The pH of the reclaimed waste liquid showed a strong alkalinity of 13.8, and had the composition shown in Table 2 below.
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【実施例】以下、上述した本発明の実施の形態に基づ
く、本発明の実施例を説明する。図１は本発明のクロム
含有排水処理装置の一実施例を示す。同図において、１
は原水槽、２は処理反応槽、３は第１の処理水槽、４は
濾過器、５は陽イオン交換樹脂塔、６は陰イオン交換樹
脂塔、７は第２の処理水槽である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention based on the above-described embodiments of the present invention will be described. FIG. 1 shows an embodiment of a chromium-containing wastewater treatment apparatus according to the present invention. In the figure, 1
Is a raw water tank, 2 is a treatment reaction tank, 3 is a first treatment water tank, 4 is a filter, 5 is a cation exchange resin tower, 6 is an anion exchange resin tower, and 7 is a second treatment water tank.
【００２４】原水槽１には、未処理のクロム含有排水
（例えば、ｐＨ７．８、電気伝導率１３５ｍＳ／ｍ、Ｃ
r6+８０ｍｇ／Ｌ、Ｃr3+１５ｍｇ／Ｌ）が貯留され、ポ
ンプ１ａによって処理反応槽２に送る。In the raw water tank 1, untreated chromium-containing wastewater (for example, pH 7.8, electric conductivity 135 mS / m, C
r 6+ 80 mg / L, Cr 3+ 15 mg / L) are stored and sent to the processing reaction tank 2 by the pump 1 a.
【００２５】処理反応槽２には、２５３．７ｎｍと１８
４．９ｎｍの紫外線を発生する紫外線ランプ２ａが透明
な保持管２ｂ内に設置され、電源２ｅから給電されるよ
うになっている。またランプ２ａは連続点灯すると、温
度が上昇するので、冷却の目的で、送風機２ｃより空気
を送るようになっている。The treatment reaction tank 2 contains 253.7 nm and 18
An ultraviolet lamp 2a for generating 4.9 nm ultraviolet light is provided in a transparent holding tube 2b, and is supplied with power from a power supply 2e. When the lamp 2a is continuously turned on, the temperature rises, so that air is sent from the blower 2c for the purpose of cooling.
【００２６】更に２ｄはオゾン発生器で、反応槽内に注
入器２ｄ１よりオゾンを注入する。オゾン注入量の目安
は反応槽容量１０００Ｌに対して５０ｇ／ｈである。前
述したように紫外線照射と注入されたオゾンの作用でク
ロム含有排水中の３価クロムは６価クロムに変換処理さ
れ、酸化処理水は第１の処理水槽３に貯留される。な
お、冷却空気の一部は１８４．９ｎｍの紫外線により照
射されると、その一部がオゾンに変化するので、反応槽
低部から注入器２ｄ２で散気して有効利用を図ってい
る。また、前述のように過酸化水素の添加が所望される
時は、予め原水槽１内に添加すればよい。An ozone generator 2d injects ozone into the reaction tank from an injector 2d1. The standard of the ozone injection amount is 50 g / h with respect to the reactor volume of 1000 L. As described above, the trivalent chromium in the chromium-containing wastewater is converted into hexavalent chromium by the action of the ultraviolet irradiation and the injected ozone, and the oxidized water is stored in the first treated water tank 3. When a part of the cooling air is irradiated with ultraviolet rays of 184.9 nm, a part of the cooling air is changed to ozone. Therefore, the cooling air is diffused from the lower part of the reaction tank by the injector 2d2 for effective use. When the addition of hydrogen peroxide is desired as described above, it may be added to the raw water tank 1 in advance.
【００２７】第１の処理水槽３の酸化処理水はポンプ３
ａにより濾過器４に送られ、ここで懸濁物質を除去す
る。この時の水質はｐＨ７．２、電気伝導率１５０ｍＳ
／ｍ、Ｃr6+９５ｍｇ／Ｌ、Ｃr3+イオンは不検出であっ
た。The oxidized water in the first treated water tank 3 is supplied to the pump 3
a to filter 4 where the suspended solids are removed. At this time, the water quality was pH 7.2, and the electrical conductivity was 150 mS.
/ M, 95 mg / L of Cr 6+ , and no Cr 3+ ion were detected.
【００２８】濾過処理水は直列に配置された陽イオン交
換樹脂塔５及び陰イオン交換樹脂塔６に通水され、前述
したように脱イオン化され、特に３価クロムイオンはほ
ぼ完全に６価クロムイオンに変換されているので、陰イ
オン交換樹脂からの脱着は容易である。The filtered water is passed through a cation exchange resin tower 5 and an anion exchange resin tower 6 which are arranged in series and deionized as described above. In particular, trivalent chromium ions are almost completely converted to hexavalent chromium ions. Since it has been converted to ions, desorption from the anion exchange resin is easy.
【００２９】イオン交換処理後、第２の処理水槽７に貯
留された処理水はｐＨ７．８、電気伝導率０．８ｍＳ／
ｍとなり、クロム成分は不検出であるから、クロム表面
処理工程の水洗水としてリサイクルできる。After the ion exchange treatment, the treated water stored in the second treated water tank 7 has a pH of 7.8 and an electric conductivity of 0.8 mS /
m and the chromium component is not detected, and can be recycled as washing water in the chromium surface treatment step.
【００３０】[0030]
【発明の効果】以上説明したように本発明によれば、化
学薬品を使用することなくクロム含有排水中の３価クロ
ムを６価クロムに変換することができるので、クロムを
吸着除去するための陰イオン交換樹脂からのクロム脱着
が容易になり、陰イオン交換反応不良と陰イオン交換樹
脂の再生不良が解消され、しかも脱イオン水はクロム表
面処理工程の水洗水としてリサイクルできる。As described above, according to the present invention, it is possible to convert trivalent chromium in chromium-containing wastewater to hexavalent chromium without using any chemicals. Chromium desorption from the anion exchange resin is facilitated, and the anion exchange reaction failure and the regeneration failure of the anion exchange resin are eliminated, and the deionized water can be recycled as washing water in the chromium surface treatment step.
【図１】本発明の一実施例を示す構成概略図である。FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.
１ 原水槽 ２ 処理反応槽 ２ａ 紫外線ランプ ２ｄ オゾン発生器 ３ 第１の処理水槽 ４ 濾過器 ５ 陽イオン交換樹脂塔 ６ 陰イオン交換樹脂塔 ７ 第２の処理水槽 DESCRIPTION OF SYMBOLS 1 Raw water tank 2 Processing reaction tank 2a Ultraviolet lamp 2d Ozone generator 3 First processing water tank 4 Filter 5 Cation exchange resin tower 6 Anion exchange resin tower 7 Second processing water tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 黒田 康弘 神奈川県横浜市保土ヶ谷区帷子町１−44 日本ワコン株式会社内 Ｆターム(参考） 4D025 AA09 AB21 BA11 BA16 BA22 BB02 BB09 DA04 DA10 4D037 AA11 AB08 BA18 BB09 CA11 CA12 CA15 4D038 AA08 AB65 BB07 BB08 BB16 4D050 AA12 AB54 BB02 BB09 BC09 CA07 CA08 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuhiro Kuroda 1-44 Jailakocho, Hodogaya-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) in Nippon Wacon Corporation 4D025 AA09 AB21 BA11 BA16 BA22 BB02 BB09 DA04 DA10 4D037 AA11 AB08 BA18 BB09 CA11 CA12 CA15 4D038 AA08 AB65 BB07 BB08 BB16 4D050 AA12 AB54 BB02 BB09 BC09 CA07 CA08
Claims (3)
オゾンを作用させる第１の処理手段と、 第１の処理手段で処理されたクロム含有排水を陰イオン
交換樹脂によって脱イオン処理する第２の処理手段と、
を備えたことを特徴とするクロム含有排水処理装置。1. A first treatment means for applying ozone while irradiating ultraviolet rays to a chromium-containing wastewater, and a second treatment for deionizing the chromium-containing wastewater treated by the first treatment means with an anion exchange resin. Processing means;
A chromium-containing wastewater treatment device comprising:
ム含有排水に作用させるようになっていることを特徴と
する請求項１のクロム含有排水処理装置。2. The chromium-containing wastewater treatment apparatus according to claim 1, wherein said first treatment means causes hydrogen peroxide to act on the chromium-containing wastewater.
線照射部に送るようになっている請求項１又は２のクロ
ム含有排水処理装置。3. The chromium-containing wastewater treatment apparatus according to claim 1, wherein said first treatment means sends cooling air to an ultraviolet irradiation unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33278799A JP2001149954A (en) | 1999-11-24 | 1999-11-24 | Device for treating chrome-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33278799A JP2001149954A (en) | 1999-11-24 | 1999-11-24 | Device for treating chrome-containing waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001149954A true JP2001149954A (en) | 2001-06-05 |
Family
ID=18258821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33278799A Pending JP2001149954A (en) | 1999-11-24 | 1999-11-24 | Device for treating chrome-containing waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001149954A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009095724A (en) * | 2007-10-15 | 2009-05-07 | Toshiba Corp | Ultraviolet sterilization device |
| KR101275858B1 (en) * | 2011-10-07 | 2013-06-24 | 포항공과대학교 산학협력단 | Moisture supplying devie on face |
| CN110174398A (en) * | 2019-07-01 | 2019-08-27 | 浙江工业大学 | Water body total chrome content on-line measuring device and method based on high-level oxidation technology |
-
1999
- 1999-11-24 JP JP33278799A patent/JP2001149954A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009095724A (en) * | 2007-10-15 | 2009-05-07 | Toshiba Corp | Ultraviolet sterilization device |
| KR101275858B1 (en) * | 2011-10-07 | 2013-06-24 | 포항공과대학교 산학협력단 | Moisture supplying devie on face |
| CN110174398A (en) * | 2019-07-01 | 2019-08-27 | 浙江工业大学 | Water body total chrome content on-line measuring device and method based on high-level oxidation technology |
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