JPH06246263A - Device and method for treating waste liquid - Google Patents

Device and method for treating waste liquid

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Publication number
JPH06246263A
JPH06246263A JP5503393A JP5503393A JPH06246263A JP H06246263 A JPH06246263 A JP H06246263A JP 5503393 A JP5503393 A JP 5503393A JP 5503393 A JP5503393 A JP 5503393A JP H06246263 A JPH06246263 A JP H06246263A
Authority
JP
Japan
Prior art keywords
wastewater
decomposition
tetrachloroethylene
water
waste liq
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
Application number
JP5503393A
Other languages
Japanese (ja)
Other versions
JP2613586B2 (en
Inventor
Hajime Shiroyama
肇 白山
Yoshimitsu Totsupeizou
芳光 藤平蔵
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.)
TOYAMA PREF GOV
Toyama Prefecture
Original Assignee
TOYAMA PREF GOV
Toyama Prefecture
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 TOYAMA PREF GOV, Toyama Prefecture filed Critical TOYAMA PREF GOV
Priority to JP5055033A priority Critical patent/JP2613586B2/en
Publication of JPH06246263A publication Critical patent/JPH06246263A/en
Application granted granted Critical
Publication of JP2613586B2 publication Critical patent/JP2613586B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Removal Of Specific Substances (AREA)

Abstract

PURPOSE:To obtain a waste liq. treating device short in treating time, free from secondary contamination and easy to maintain by a method wherein this device is provided with a decomposition tank having therein a quartz made water storing part as in the form of a spiral tube for receiving therein the waste liq. containing org. chlorines compound and an ultraviolet lamp is provided in the spiral tube passing through its center. CONSTITUTION:The waste liq. treating method includes sending waste liq. from a dry cleaning machine into a water separating tank for separation into tetrachloroethylene and water, recovering the separated tetrachloroethylene, collecting the tetrachloroethylene dissolved water in a two stage water separating machine, drawing up and passing the waste liq. through a filter for removal of the impurities and thereafter sending the same to a decomposition device 4A. The decomposition device 4A is provided in a decomposition tank 8 with a water storing part 9 consisting of the spiral tube made of the quartz high in ultraviolet ray tramsmission factor, an ultraviolet lamp 7 is provided in the spiral tube of the water storing part 9 passing through its center and, by the ultraviolet rays therefrom, the tetrachloroethylene in the waste liq. is decomposed into harmless carbon dioxide, hydrogen ions and chlorine ions.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、クリーニング事業所
等から排出されるテトラクロロエチレン等の有機塩素系
化合物を含有する排水の処理装置と処理方法に関する
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for treating wastewater containing an organic chlorine compound such as tetrachloroethylene discharged from a cleaning facility.

【0002】[0002]

【従来の技術】従来、ドライクリーニングを行なってい
るクリーニング事業所では、テトラクロロエチレンをド
ライクリーニング溶剤として用いており、その排水はテ
トラクロロエチレンを含有している。そして、このテト
ラクロロエチレン及びトリクロロエチレンによる地下水
汚染が問題となっていることから、その排水基準が制定
されている。その排水中のテトラクロロエチレンの処理
方法としては、活性炭にテトラクロロエチレンを吸着さ
せて分離除去する方法や、テトラクロロエチレンを大気
中に放散させる曝気法がある。
2. Description of the Related Art Conventionally, a cleaning business which carries out dry cleaning uses tetrachloroethylene as a dry cleaning solvent, and its waste water contains tetrachloroethylene. Since the groundwater pollution by the tetrachlorethylene and trichlorethylene is a problem, the drainage standard is established. As a method for treating tetrachloroethylene in the wastewater, there are a method of adsorbing tetrachloroethylene on activated carbon to separate and remove it, and an aeration method of releasing tetrachloroethylene into the atmosphere.

【0003】また、特開昭63−218293号公報に
開示されているように、トリクロロエチレンを含有した
排水の処理方法として、この排水に過酸化水素を添加
し、紫外線照射してトリクロロエチレンを分解し、この
後その排水をさらに、紫外線を照射しながら活性炭素繊
維吸着層を通してトリクロロエチレンを分解除去する方
法が提案されている。
Further, as disclosed in Japanese Patent Laid-Open No. 63-218293, as a method for treating wastewater containing trichlorethylene, hydrogen peroxide is added to this wastewater and irradiated with ultraviolet rays to decompose trichlorethylene, After that, a method of decomposing and removing trichlorethylene through the activated carbon fiber adsorption layer while irradiating the waste water with ultraviolet rays is proposed.

【0004】[0004]

【発明が解決しようとする課題】上記従来の技術の活性
炭吸着法では、活性炭の劣化時期の把握が困難であり、
吸着後の廃活性炭の処理の問題があった。また、曝気法
では大気中にテトラクロロエチレンが拡散することにな
り、二次汚染が生じるという問題があった。さらに、上
記公開公報に開示された方法は、装置が複雑であり、ま
た排水中のトリクロロエチレンの分解に時間がかかると
いう問題がある。
With the above-mentioned conventional activated carbon adsorption method, it is difficult to grasp the time of deterioration of activated carbon.
There was a problem with the treatment of waste activated carbon after adsorption. Further, in the aeration method, there is a problem that tetrachloroethylene is diffused into the atmosphere, which causes secondary pollution. Further, the method disclosed in the above publication has problems that the apparatus is complicated and that it takes time to decompose trichlorethylene in the waste water.

【0005】特に、上記各従来の技術を用いた排水処理
装置では、小規模なクリーニング事業所にとって、導入
コスト及び日常の管理が困難であり、確実な排水処理が
できないものであった。
Particularly, in the wastewater treatment equipment using each of the above-mentioned conventional techniques, it is difficult for a small-scale cleaning establishment to introduce the wastewater and to manage it on a daily basis, so that the wastewater treatment cannot be performed reliably.

【0006】この発明は、上記の従来の技術の問題点に
鑑みて成されたもので、有機塩素系化合物を含有する排
水を無害なものへ分解する処理時間が短く、二次汚染も
生ぜず、且つ維持管理が容易な排水処理装置及び排水処
理方法を提供することを目的とする。
The present invention has been made in view of the above-mentioned problems of the prior art, and the treatment time for decomposing wastewater containing an organic chlorine compound into harmless ones is short and no secondary pollution occurs. It is also an object of the present invention to provide a wastewater treatment device and a wastewater treatment method that are easy to maintain and manage.

【0007】[0007]

【課題を解決するための手段】この発明は、テトラクロ
ロエチレン等の有機塩素系化合物を含有する排水が注入
される螺旋管状に形成された石英製の貯水部を有した分
解槽を設け、この貯水部の螺旋中心位置に、例えば25
3.7nmに主エネルギーを有する紫外線を出す紫外線ラ
ンプを配置した排水処理装置である。またこの発明は、
排水が注入される中空の二重円筒からなる石英製の貯水
部を有した分解槽を設け、この貯水部の二重円筒間に排
水を注入し、上記二重円筒の中心の中空部に紫外線ラン
プを配置した排水処理装置である。さらにこの発明は、
排水が注入される中空状の分解槽を設け、この分解槽中
央部に石英製のランプ収納筒を配設し、このランプ収納
筒内に紫外線ランプを配置した排水処理装置である。
DISCLOSURE OF THE INVENTION The present invention provides a decomposition tank having a quartz-made water storage part formed in a spiral tube into which waste water containing an organic chlorine compound such as tetrachloroethylene is injected, and the water storage part is provided. At the spiral center position of, for example, 25
This is a wastewater treatment system in which an ultraviolet lamp that emits ultraviolet rays having a main energy of 3.7 nm is arranged. This invention also
A decomposition tank with a quartz water storage part consisting of a hollow double cylinder into which waste water is injected is provided, and waste water is injected between the double cylinders of this water storage part, and ultraviolet rays are introduced into the hollow part at the center of the double cylinder. It is a wastewater treatment device with a lamp. Furthermore, this invention is
This is a wastewater treatment device in which a hollow decomposition tank into which waste water is injected is provided, a quartz lamp storage cylinder is arranged in the center of the decomposition tank, and an ultraviolet lamp is arranged in the lamp storage cylinder.

【0008】またこの発明は、排水中の有機塩素系化合
物を分解する際に、排水中の酸素を除去し、酸素を除去
した排水に紫外線を照射する排水処理方法である。さら
に、上記排水に亜硫酸ナトリウム等の亜硫酸塩を添加し
て紫外線照射する排水処理方法である。
The present invention is also a wastewater treatment method in which oxygen in the wastewater is removed when the organochlorine compound in the wastewater is decomposed and the wastewater from which oxygen has been removed is irradiated with ultraviolet rays. Furthermore, it is a wastewater treatment method in which a sulfite salt such as sodium sulfite is added to the wastewater and ultraviolet rays are irradiated.

【0009】[0009]

【作用】この発明は、例えば253.7nmに主エネルギ
ーを有する紫外線により、排水中のテトラクロロエチレ
ンやトリクロロエチレンを、無害な二酸化炭素と水素イ
オン及び塩素イオンに分解するものである。この発明の
排水処理装置は、例えばクリーニング事業所の一日あた
りの排水量、排水中のテトラクロロエチレン濃度及びそ
の他有機質夾雑物等、排水の質を考慮して、上述の、石
英製の螺旋管状貯水部を有した分解槽、中空の二重円筒
状貯水部を有した分解槽、またはランプ収納筒を有した
分解槽を適宜選択して用いるものである。
The present invention decomposes tetrachloroethylene and trichlorethylene in waste water into harmless carbon dioxide, hydrogen ions and chlorine ions by ultraviolet rays having a main energy of 253.7 nm, for example. The wastewater treatment equipment of the present invention is, for example, the above-mentioned quartz spiral tubular water storage section in consideration of the quality of wastewater such as the amount of wastewater per day at a cleaning establishment, the concentration of tetrachlorethylene in the wastewater, and other organic contaminants. A decomposition tank having the same, a decomposition tank having a hollow double cylindrical water storage portion, or a decomposition tank having a lamp storage cylinder is appropriately selected and used.

【0010】また、テトラクロロエチレンを分解する
と、分解途中でトリクロロエチレンが生成する。このト
リクロロエチレンを効率的に除去するために、処理前の
排水中に窒素ガスを通気し、嫌気状態で紫外線を照射す
ることにより、トリクロロエチレンの分解率を高めるこ
とができたものである。また、亜硫酸ナトリウム等の亜
硫酸塩を処理前の排水に添加することによっても、テト
ラクロロエチレンの分解率に影響を及ぼすことなく、ト
リクロロエチレンの分解を著しく促進することができ
た。
When tetrachloroethylene is decomposed, trichlorethylene is produced during the decomposition. In order to efficiently remove this trichlorethylene, nitrogen gas was passed through the wastewater before treatment and ultraviolet rays were irradiated in an anaerobic state, whereby the decomposition rate of trichlorethylene could be increased. Also, by adding a sulfite such as sodium sulfite to the wastewater before treatment, it was possible to remarkably accelerate the decomposition of trichlorethylene without affecting the decomposition rate of tetrachloroethylene.

【0011】ここで、テトラクロロエチレン及びトリク
ロロエチレンの分解反応は、水溶液中で、水と溶存酸素
との反応により、次式(1)及び(2)に示すように二
酸化炭素と塩素イオン及び水素イオンに分解される。 C2Cl4 + 2H2O + O2 → 2CO2 + 4H+ + 4Cl- (1) C2HCl3 + 2H2O + O2 → 2CO2 + 5H+ + 3Cl- (2) 従って、反応の進行に伴い、溶存酸素濃度の減少、pH
の低下及び塩素イオン濃度の増加がみられる。
Here, the decomposition reaction of tetrachloroethylene and trichloroethylene is carried out by the reaction of water and dissolved oxygen in an aqueous solution into carbon dioxide, chlorine ion and hydrogen ion as shown in the following formulas (1) and (2). To be done. C 2 Cl 4 + 2H 2 O + O 2 → 2CO 2 + 4H + + 4Cl - (1) C 2 HCl 3 + 2H 2 O + O 2 → 2CO 2 + 5H + + 3Cl - (2) Accordingly, the reaction With progress, decrease of dissolved oxygen concentration, pH
And decrease in chloride ion concentration.

【0012】また、上記排水処理方法に示すように、分
解前に亜硫酸塩の添加や窒素ガスの通気によって、溶存
酸素がOmg/lに近い嫌気状態となる。これは、窒素ガス
の通気により、排水中の酸素と窒素が置換されるからで
ある。また、亜硫酸塩を排水中に添加すると、次式
(3)に示す反応により、排水中の酸素が消費されるか
らである。 2SO3 2- + O2 2SO4 2- (3) この嫌気状態でのテトラクロロエチレン及びトリクロロ
エチレンの分解機構は、式(1)や(2)に示す反応と
異なり、波長300nm以下の紫外線エネルギーにより、
原子間結合の解離によるものであると考えられる。
Further, as shown in the above wastewater treatment method,
Before dissolution, dissolved by adding sulfite or aeration of nitrogen gas
Oxygen becomes an anaerobic condition close to Omg / l. This is nitrogen gas
The oxygen in the wastewater is replaced by nitrogen by the ventilation of
is there. If sulfite is added to the wastewater,
Is oxygen in wastewater consumed by the reaction shown in (3)?
It is.  2SO3 2- + O2 → 2SOFour 2- (3) Tetrachlorethylene and trichloro in this anaerobic state
The decomposition mechanism of ethylene is the reaction shown in formulas (1) and (2).
Differently, due to the UV energy of wavelength less than 300 nm,
It is thought that this is due to dissociation of interatomic bonds.

【0013】[0013]

【実施例】以下、この発明の実施例について、図面に基
づいて説明する。この実施例のテトラクロロエチレンを
含有した排水の処理装置は、図1に示すように、ドライ
クリーニング機の排水を、先ず、図示しない水分離槽に
入れ、テトラクロロエチレンと水とを分離し、分離され
たテトラクロロエチレンを回収し、テトラクロロエチレ
ンが溶けた水を、2段目の水分離器1に貯留する。水分
離器1の排水を液中ポンプ2により吸い上げ、フィルタ
ー3を通し夾雑物を取り除いた後、分解装置4に送る。
そして、分解装置4で排水に紫外線照射を行ない、テト
ラクロロエチレン等を分解しタンク5に貯留する。
Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the apparatus for treating wastewater containing tetrachloroethylene of this example first put the wastewater of a dry cleaning machine into a water separation tank (not shown) to separate tetrachloroethylene and water, and separate the separated tetrachloroethylene. Is collected and the water in which tetrachloroethylene is dissolved is stored in the second-stage water separator 1. The drainage of the water separator 1 is sucked up by a submerged pump 2, passed through a filter 3 to remove impurities, and then sent to a decomposition device 4.
Then, the decomposition device 4 irradiates the waste water with ultraviolet rays to decompose tetrachloroethylene and the like and store it in the tank 5.

【0014】この実施例の分解装置4は、図2〜図4に
示す分解装置4A,4B,4Cの型がある。各分解装置
4A〜Cには、紫外線ランプ7が取り付けられた電気安
定器6が設けられ、この電気安定器6とともに紫外線ラ
ンプ7が分解槽8に取り付けられている。
The disassembling apparatus 4 of this embodiment is of the type of disassembling apparatus 4A, 4B and 4C shown in FIGS. Each of the decomposition devices 4A to 4C is provided with an electric ballast 6 to which an ultraviolet lamp 7 is attached, and the ultraviolet lamp 7 is attached to a decomposition tank 8 together with the electric ballast 6.

【0015】ここで、図2に示す分解装置4Aは、紫外
線透過率の高い石英製の螺旋管からなる貯水部9が分解
槽8内に設けられ、この螺旋状の貯水部9の螺旋の中心
部分に紫外線ランプ7が挿通されている。排水は、この
貯水部9の下方から注入され、上方から排出される。こ
の実施例では、排水を貯水部9に一旦溜めて、紫外線照
射を行い分解処理した後、排水を排出するようにして実
験をしたものであるが、分解速度等を考慮して、排水を
連続的に貯水部9に送り込むようにしても良いものであ
る。
Here, in the decomposition apparatus 4A shown in FIG. 2, a water storage section 9 made of a quartz spiral tube having a high ultraviolet transmittance is provided in the decomposition tank 8, and the spiral center of the spiral water storage section 9 is provided. The ultraviolet lamp 7 is inserted through the portion. Waste water is injected from below the water storage unit 9 and discharged from above. In this example, the wastewater was temporarily stored in the water storage unit 9, and was subjected to an experiment in which it was irradiated with ultraviolet rays to be decomposed and then discharged, but the wastewater was continuously discharged in consideration of the decomposition rate and the like. Alternatively, the water may be sent to the water storage section 9.

【0016】また、図3に示す分解装置4Bは、紫外線
透過率の高い石英製の中空の二重円筒からなる貯水部1
0が、分解槽8内の中心部に設けられ、この二重円筒間
に排水が注入されるものである。そして、上記二重円筒
の貯水部10の中央部の中空部分に、紫外線ランプ7が
配置されている。この実施例でも、排水を貯水部10に
一旦溜めて、紫外線照射を行い分解処理した後、排水を
排出するようにして実験をしている。しかし、ここで
も、分解速度等を考慮して、排水を連続的に貯水部10
に送り込むようにしても良いものである。
The decomposition device 4B shown in FIG. 3 is composed of a water storage unit 1 made of a quartz double hollow cylinder having a high ultraviolet transmittance.
No. 0 is provided in the center of the decomposition tank 8 and drainage is injected between the double cylinders. The ultraviolet lamp 7 is arranged in the hollow portion of the central portion of the water storage portion 10 of the double cylinder. Also in this example, an experiment is conducted in which wastewater is temporarily stored in the water storage unit 10, is irradiated with ultraviolet rays to be decomposed, and then the wastewater is discharged. However, also here, the wastewater is continuously stored in consideration of the decomposition rate and the like.
It may be sent to.

【0017】さらに、図4に示す分解装置4Cは、ステ
ンレス等の金属で分解槽8を形成し、この分解槽8内
に、ランプ収納筒11内に収納された紫外線ランプ7を
配置し、分解槽8に直接排水を注入するものである。こ
のランプ収納筒11は、紫外線ランプ7を排水から保護
するためのものであり、紫外線透過率の高い石英製のも
のである。この実施例の分解槽8は、排水を分解槽8に
一旦溜めて、紫外線照射を行い分解処理した後、排水を
排出するものである。
Further, in the decomposition apparatus 4C shown in FIG. 4, the decomposition tank 8 is formed of metal such as stainless steel, and the ultraviolet lamp 7 housed in the lamp housing cylinder 11 is arranged in the decomposition tank 8 and decomposed. Waste water is directly injected into the tank 8. The lamp housing cylinder 11 is for protecting the ultraviolet lamp 7 from drainage, and is made of quartz having a high ultraviolet transmittance. In the decomposition tank 8 of this embodiment, waste water is temporarily stored in the decomposition tank 8, irradiated with ultraviolet rays to be decomposed, and then the waste water is discharged.

【0018】また、各分解槽8での紫外線ランプ7の本
数は1本で出力は、12Wである。上記の各分解装置4
A〜Cの形や材質、紫外線ランプの出力及び処理容量を
表1に示す。
The number of ultraviolet lamps 7 in each decomposition tank 8 is 1 and the output is 12W. Each of the above decomposition devices 4
Table 1 shows the shapes and materials of A to C, the output of the ultraviolet lamp and the processing capacity.

【0019】[0019]

【表1】 [Table 1]

【0020】ここで、図2の分解装置4Aの螺旋管状の
貯水部9は、紫外線の被照射面積が大きいことを特徴と
し、1回あたりの処理量は45mlであるので、例えば1
日の排水量の少ない小規模なクリーニング事業所等を対
象とする。
Here, the spiral tubular water storage section 9 of the decomposition apparatus 4A shown in FIG. 2 is characterized in that the area to be irradiated with ultraviolet rays is large, and the treatment amount per time is 45 ml.
Targets small-scale cleaning establishments with low daily discharge.

【0021】また、図3の分解装置4Bの貯水部10
は、紫外線ランプ7からの光の到達距離を1.5cm以内
にし、紫外線の減衰をできるだけ小さくしたことを特徴
とし、1回あたりの処理量は270mlであるので、例え
ば1日の排水量が比較的多い中規模なクリーニング事業
所等を対象とする。
Further, the water storage section 10 of the decomposition apparatus 4B shown in FIG.
Is characterized in that the reaching distance of the light from the ultraviolet lamp 7 is within 1.5 cm and the attenuation of ultraviolet rays is as small as possible. Since the amount of treatment per treatment is 270 ml, for example, the daily discharge amount is relatively small. Targets a large number of medium-sized cleaning offices.

【0022】さらに、図4の分解装置4Cは、紫外線ラ
ンプ7を保護するためのランプ収納筒11が取り付けら
れているもので、排水はステンレス製の分解槽8に直接
注入されるものであり、1回あたりの処理量が3,00
0mlであり、1日の排水量が多くかつ排水中のテトラク
ロロエチレン濃度が比較的低いクリーニング事業所等を
対象とする。
Further, the disassembling apparatus 4C shown in FIG. 4 is provided with a lamp housing cylinder 11 for protecting the ultraviolet lamp 7, and the waste water is directly injected into the stainless decomposition tank 8. Processing amount per time is 3,000
It is 0 ml, and is intended for cleaning offices, etc. that have a large amount of drainage per day and a relatively low concentration of tetrachlorethylene in the drainage.

【0023】次に、この実施例の排水処理装置の紫外線
照射による分解率及び分解速度定数について説明する。
t分後の分解率及び分解速度定数は、次式(4)及び
(5)により与えられる。 分解率(%)=(1−t分後の濃度/初期の濃度)×100 (4) lnCt =lnCo−kt (5) Ct : t分後の濃度 [μg・l-1] Co : 初期の濃度 [μg・l-1] k : 分解速度定数 [μg・l-1 ・ min-1
Next, the decomposition rate and decomposition rate constant of the waste water treatment equipment of this embodiment due to the irradiation of ultraviolet rays will be described.
The decomposition rate and decomposition rate constant after t minutes are given by the following equations (4) and (5). Degradation rate (%) = (concentration after 1-t minutes / initial concentration) × 100 (4) lnCt = lnCo−kt (5) Ct: concentration after t minutes [μg · l −1 ] Co: initial Concentration [μg · l −1 ] k: Decomposition rate constant [μg · l −1 · min −1 ]

【0024】各分解槽4A,4B,4Cでのテトラクロ
ロエチレン及びトリクロロエチレンの初期濃度を、約1
0,000[μg・l-1]に調整した標準試料の分解時
間(分)に対する分解率(%)の一例を図5,図6に、
また分解速度定数[μg・l-1 ・ min-1]の測定結果
の例を表2に示す。
The initial concentration of tetrachlorethylene and trichlorethylene in each of the decomposition tanks 4A, 4B and 4C is about 1
An example of the decomposition rate (%) with respect to the decomposition time (min) of the standard sample adjusted to 0000 [μg · l -1 ] is shown in FIGS.
Table 2 shows an example of the measurement results of the decomposition rate constant [μg · l −1 · min −1 ].

【0025】[0025]

【表2】 [Table 2]

【0026】分解速度定数kは分解装置4C、4B、4
Aの順に大きくなり、特に4Aの分解率は10〜15分
の短時間で99.9%以上と高く、テトラクロロエチレ
ンは勿論のこと、トリクロロエチレンに対しても効果の
あることが分かる。
The decomposition rate constant k is determined by the decomposition devices 4C, 4B and 4
It becomes larger in the order of A, and in particular, the decomposition rate of 4A is as high as 99.9% or more in a short time of 10 to 15 minutes, and it is understood that it is effective not only for tetrachlorethylene but also for trichlorethylene.

【0027】次に、実際のドライクリーニング機を使用
している事業所排水を対象として、分解装置4Aを使用
したときの分解結果の例を表3に示す。
Next, Table 3 shows an example of decomposition results when the decomposition apparatus 4A is used for wastewater discharged from an office where an actual dry cleaning machine is used.

【0028】[0028]

【表3】 [Table 3]

【0029】表3のX,Y,Zで示す3事業所ともテト
ラクロロエチレンの初期濃度81〜135mg/lに対し
て、60分後の分解率が99.9%以上と高く、濃度も
0.009〜0.026mg/lと水質汚濁防止法による排水
基準値0.1mg/lを十分クリアしている。
At the three offices indicated by X, Y and Z in Table 3, the decomposition rate after 60 minutes was as high as 99.9% or more, and the concentration was 0.009 with respect to the initial concentration of tetrachloroethylene of 81 to 135 mg / l. 〜0.026mg / l and the effluent standard value of 0.1mg / l according to the Water Pollution Control Law are sufficiently cleared.

【0030】次に、テトラクロロエチレンの分解中に生
成するトリクロロエチレンの処理の実施例について説明
する。トリクロロエチレンは、分解前に亜硫酸ナトリウ
ム等の亜硫酸塩の添加や、窒素ガスを排水中に通気する
ことにより、嫌気状態を形成し、この後その排水に紫外
線を照射すると著しい分解効果を示した。従って、亜硫
酸塩や窒素ガスは、分解促進剤として有効に働く。ここ
で、実際のドライクリーニング機を使用している事業所
排水を対象として、上記分解装置4Aを使用し、排水5
0mlに対して亜硫酸塩を30mgの割合で添加した場
合と、しない場合の分解結果の例を表4に示す。
Next, an example of treatment of trichloroethylene produced during decomposition of tetrachloroethylene will be described. Trichlorethylene formed an anaerobic state by adding a sulfite such as sodium sulfite or aeration of nitrogen gas into the wastewater before decomposition, and then, when the wastewater was irradiated with ultraviolet rays, trichlorethylene exhibited a remarkable decomposition effect. Therefore, sulfite and nitrogen gas work effectively as a decomposition accelerator. Here, using the above-mentioned disassembling device 4A, the wastewater 5
Table 4 shows examples of decomposition results with and without the addition of 30 mg of sulfite to 0 ml.

【0031】[0031]

【表4】 [Table 4]

【0032】表4に示すように、亜硫酸塩を添加するこ
とによりテトラクロロエチレン及びトリクロロエチレン
の分解率が著しく向上するものであり、特にトリクロロ
エチレンに大きな効果がある。
As shown in Table 4, by adding sulfite, the decomposition rate of tetrachloroethylene and trichloroethylene is remarkably improved, and trichlorethylene is particularly effective.

【0033】なお、テトラクロロエチレン及びトリクロ
ロエチレンは、分解が進行するにつれて水素イオンを生
成することから、処理排水はpHが酸性になる。そこ
で、これを中和するために、1N−NaOHを使用する
と良い。例えば、分解装置4Aでは数mlの滴下で容易に
pHが7前後となる。
Since tetrachloroethylene and trichloroethylene produce hydrogen ions as the decomposition progresses, the pH of the treated wastewater becomes acidic. Therefore, it is preferable to use 1N-NaOH to neutralize this. For example, in the decomposing device 4A, the pH is easily adjusted to about 7 by dropping a few ml.

【0034】また、この中和操作をせずに簡単化するた
めに、分解前に亜硫酸ナトリウム等の亜硫酸塩を添加す
る方法も有効である。即ち、亜硫酸塩の添加により、排
水中の酸素が消費されるのみならず、排水のpHをアル
カリ性にすることから、上述の分解促進効果のみなら
ず、中和効果をもたらすものである。
In order to simplify this neutralization operation without adding it, it is also effective to add a sulfite such as sodium sulfite before the decomposition. That is, the addition of the sulfite not only consumes oxygen in the wastewater but also makes the pH of the wastewater alkaline, so that not only the above-mentioned decomposition promoting effect but also a neutralizing effect is brought about.

【0035】なお、この発明は上記実施例に限定される
ものではなく、分解槽に紫外線ランプを直接挿入し、排
水中に紫外線ランプが直接触れるものでも良い。また、
分解槽の内側を金属面等の鏡面にすることにより、外部
に紫外線が漏れず、紫外線の使用効率が高いものとな
る。
The present invention is not limited to the above embodiment, and an ultraviolet lamp may be directly inserted into the decomposition tank so that the ultraviolet lamp directly contacts the drainage. Also,
By making the inside of the decomposition tank a mirror surface such as a metal surface, ultraviolet rays do not leak to the outside, and the efficiency of use of ultraviolet rays becomes high.

【0036】[0036]

【発明の効果】この発明による3つの型の分解槽は、標
準試料だけでなく実際のドライクリーニング機を使用し
ている事業所排水についても、現場の状況に合せ、短時
間に効率良くテトラクロロエチレン及びトリクロロエチ
レンの分解を行なっているものであり、良好な結果が得
られている。従って、従来から行なわれている活性炭吸
着処理法等の問題点である維持管理や廃棄物処理等の解
決が図られ、装置のコストや維持費用が安価であり、そ
の実用性は極めて高いものである。
The three types of decomposing tanks according to the present invention efficiently and effectively remove tetrachloroethylene and not only standard samples but also industrial wastewater using an actual dry cleaning machine in a short time according to the situation of the site. Since it is decomposing trichlorethylene, good results have been obtained. Therefore, problems such as the conventional activated carbon adsorption treatment method, etc., such as maintenance and waste treatment, can be solved, the cost of the device and the maintenance cost are low, and its practicality is extremely high. is there.

【0037】また、この発明による嫌気状態での紫外線
照射や、亜硫酸塩の添加は、テトラクロロエチレンの分
解に効果があるばかりでなく、分解中に発生するトリク
ロロエチレンをも効率よく分解するものであり、二次生
成物の処理やpHの調整工程を簡便化でき、日常の管理
も容易なことから、更に実用性が高いものである。
Further, the irradiation of ultraviolet rays in the anaerobic state and the addition of sulfite according to the present invention not only have an effect on the decomposition of tetrachloroethylene, but also efficiently decompose the trichlorethylene generated during the decomposition. It is more practical because it can simplify the process of treating the next product and the process of adjusting the pH, and can easily manage it on a daily basis.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の排水処理装置を適用するクリーニン
グ事業所の排水処理を示す概略図である。
FIG. 1 is a schematic diagram showing wastewater treatment of a cleaning establishment to which the wastewater treatment apparatus of the present invention is applied.

【図2】この発明の一実施例の分解装置を示す縦断面図
である。
FIG. 2 is a vertical sectional view showing a disassembling apparatus according to an embodiment of the present invention.

【図3】この発明の他の実施例の分解装置を示す縦断面
図である。
FIG. 3 is a vertical sectional view showing a disassembling apparatus according to another embodiment of the present invention.

【図4】この発明のさらに他の実施例の分解装置を示す
縦断面図である。
FIG. 4 is a vertical sectional view showing a disassembling apparatus according to still another embodiment of the present invention.

【図5】この発明の排水処理装置の各実施例のテトラク
ロロエチレンの分解率を示すグラフである。
FIG. 5 is a graph showing the decomposition rate of tetrachloroethylene in each example of the wastewater treatment equipment of the present invention.

【図6】この発明の排水処理装置の各実施例のトリクロ
ロエチレンの分解率を示すグラフである。
FIG. 6 is a graph showing the decomposition rate of trichlorethylene in each example of the wastewater treatment equipment of the present invention.

【符号の説明】[Explanation of symbols]

4,4A,4B,4C 分解装置 7 紫外線ランプ 8 分解槽 9,10 貯水部 4,4A, 4B, 4C Decomposing device 7 Ultraviolet lamp 8 Decomposing tank 9,10 Water storage part

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 有機塩素系化合物を含有する排水が注入
される螺旋管状の石英製貯水部を有した分解槽を設け、
この貯水部の螺旋中心に沿って紫外線ランプを配置した
ことを特徴とする排水処理装置。
1. A decomposition tank having a spiral tubular quartz water storage section into which waste water containing an organic chlorine compound is injected,
A wastewater treatment device characterized in that an ultraviolet lamp is arranged along the spiral center of the water storage section.
【請求項2】 有機塩素系化合物を含有する排水が注入
される中空の二重円筒からなる石英製の貯水部を有した
分解槽を設け、この二重円筒間の貯水部に排水を注入
し、上記二重円筒の中空部に紫外線ランプを配置したこ
とを特徴とする排水処理装置。
2. A decomposition tank having a water storage part made of quartz and consisting of a hollow double cylinder into which waste water containing an organochlorine compound is injected is provided, and the waste water is injected into the water storage part between the double cylinders. A wastewater treatment device, wherein an ultraviolet lamp is arranged in the hollow portion of the double cylinder.
【請求項3】 有機塩素系化合物を含有する排水が注入
される中空状の分解槽を設け、この分解槽内に石英製の
ランプ収納筒を配設し、このランプ収納筒内に紫外線ラ
ンプを配置したことを特徴とする排水処理装置。
3. A hollow decomposition tank into which waste water containing an organic chlorine compound is injected is provided, and a quartz lamp storage cylinder is provided in the decomposition tank, and an ultraviolet lamp is installed in the lamp storage cylinder. Wastewater treatment equipment characterized by being placed.
【請求項4】 排水中の有機塩素系化合物を分解する際
に、排水中の酸素を除去し、その排水に紫外線を照射す
ることを特徴とする排水処理方法。
4. A method for treating wastewater, which comprises decomposing oxygen in the wastewater and irradiating the wastewater with ultraviolet rays when decomposing the organochlorine compound in the wastewater.
【請求項5】 排水中の有機塩素系化合物を紫外線照射
して分解する際に、上記排水に亜硫酸塩を添加して紫外
線を照射することを特徴とする排水処理方法。
5. A method for treating wastewater, which comprises irradiating ultraviolet rays by adding sulfite to the wastewater when the organochlorine compound in the wastewater is decomposed by irradiation with ultraviolet rays.
JP5055033A 1993-02-19 1993-02-19 Wastewater treatment equipment and wastewater treatment method Expired - Fee Related JP2613586B2 (en)

Priority Applications (1)

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JP5055033A JP2613586B2 (en) 1993-02-19 1993-02-19 Wastewater treatment equipment and wastewater treatment method

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Application Number Priority Date Filing Date Title
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Publications (2)

Publication Number Publication Date
JPH06246263A true JPH06246263A (en) 1994-09-06
JP2613586B2 JP2613586B2 (en) 1997-05-28

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ID=12987352

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Country Status (1)

Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6007686A (en) * 1994-08-26 1999-12-28 Medical Discoveries, Inc. System for elctrolyzing fluids for use as antimicrobial agents
US6117285A (en) * 1994-08-26 2000-09-12 Medical Discoveries, Inc. System for carrying out sterilization of equipment
KR20040015414A (en) * 2002-08-12 2004-02-19 주식회사 비.엠 텔레콤 Sterilization unit of clean water apparatus
KR100446437B1 (en) * 2002-05-08 2004-09-01 유토파워주식회사 Electronic radiation apparatus for Sewage/waste water treatment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62114694A (en) * 1985-11-14 1987-05-26 Matsushita Electric Works Ltd Ultraviolet sterilizing apparatus
JPH04358590A (en) * 1991-03-12 1992-12-11 Matsushita Electric Works Ltd Water purifier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62114694A (en) * 1985-11-14 1987-05-26 Matsushita Electric Works Ltd Ultraviolet sterilizing apparatus
JPH04358590A (en) * 1991-03-12 1992-12-11 Matsushita Electric Works Ltd Water purifier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6007686A (en) * 1994-08-26 1999-12-28 Medical Discoveries, Inc. System for elctrolyzing fluids for use as antimicrobial agents
US6117285A (en) * 1994-08-26 2000-09-12 Medical Discoveries, Inc. System for carrying out sterilization of equipment
KR100446437B1 (en) * 2002-05-08 2004-09-01 유토파워주식회사 Electronic radiation apparatus for Sewage/waste water treatment
KR20040015414A (en) * 2002-08-12 2004-02-19 주식회사 비.엠 텔레콤 Sterilization unit of clean water apparatus

Also Published As

Publication number Publication date
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