JP2001029969A - Treatment of organochlorine compound in wastewater - Google Patents

Treatment of organochlorine compound in wastewater

Info

Publication number
JP2001029969A
JP2001029969A JP11204378A JP20437899A JP2001029969A JP 2001029969 A JP2001029969 A JP 2001029969A JP 11204378 A JP11204378 A JP 11204378A JP 20437899 A JP20437899 A JP 20437899A JP 2001029969 A JP2001029969 A JP 2001029969A
Authority
JP
Japan
Prior art keywords
treated
water
reaction tank
ozone
treatment
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
Application number
JP11204378A
Other languages
Japanese (ja)
Inventor
Miki Masuda
幹 増田
Ryozo Ushio
亮三 牛尾
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.)
Sumitomo Metal Mining Co Ltd
Original Assignee
Sumitomo Metal Mining Co Ltd
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 Sumitomo Metal Mining Co Ltd filed Critical Sumitomo Metal Mining Co Ltd
Priority to JP11204378A priority Critical patent/JP2001029969A/en
Publication of JP2001029969A publication Critical patent/JP2001029969A/en
Pending legal-status Critical Current

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  • Physical Water Treatments (AREA)
  • Removal Of Specific Substances (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a treatment method of organochlorine compound that can treat an organochlorine compd. such as dioxins or the like in wastewater by using a small-sized apparatus not requiring a plurality of tanks to efficiently remove the same in a short time. SOLUTION: The water to be treated introduced into a reaction tank 1 is irradiated with ultraviolet rays from an ultraviolet lamp 2 while the pH thereof is adjusted to 6-10 by a pH controller 4 and, at the same time, ozone is continuously supplied to the water to be treated to remove an organochlorine compd. It is pref. that ozone is continuously introduced into the reaction tank 1 in an amt. of 300 mg or more per liter of the water to be treated in the reaction tank by using a vortex pump 3 while mixed with water to be treated.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、産業排水等に含ま
れる有機塩素化合物、特にダイオキシン類を除去するた
めの処理方法に関する。
[0001] The present invention relates to a treatment method for removing organic chlorine compounds, particularly dioxins, contained in industrial wastewater and the like.

【0002】[0002]

【従来の技術】従来、産業排水等の処理操作は、浮遊物
質の除去を目的とする凝集沈澱処理や濾過処理、有機物
や窒素成分を除去するための生物分解処理、あるいは活
性炭による吸着処理等を組み合わせて行われている。し
かし、このような従来の方法では、ダイオキシン類等の
有機塩素化合物を効果的に除去することは極めて困難で
あった。
2. Description of the Related Art Conventionally, treatment operations for industrial wastewater and the like include coagulation sedimentation treatment and filtration treatment for removing suspended substances, biodegradation treatment for removing organic substances and nitrogen components, and adsorption treatment with activated carbon. It is done in combination. However, it has been extremely difficult with such conventional methods to effectively remove organic chlorine compounds such as dioxins.

【0003】産業排水等に含まれるダイオキシン類の除
去に関しては、特許第2874126号公報に、紫外線
の照射下でオゾン処理する方法が提案されている。この
方法は、被処理水をpH処理槽に導入して中性ないし弱
酸性に調整し、この処理水を処理槽に送って紫外線の照
射下にオゾンを供給してオゾン処理することにより、ダ
イオキシン類を酸化除去するものである。
[0003] Regarding the removal of dioxins contained in industrial wastewater and the like, Japanese Patent No. 2874126 proposes a method of ozone treatment under irradiation of ultraviolet rays. According to this method, dioxin is introduced by introducing water to be treated into a pH treatment tank to adjust the pH to neutral or weakly acidic, sending the treated water to a treatment tank, supplying ozone under irradiation of ultraviolet rays, and performing ozone treatment. Is to oxidize and remove the species.

【0004】[0004]

【発明が解決しようとする課題】上記した特許第287
4126号公報記載の方法によれば、ダイオキシン類を
80%以上酸化除去できるとされている。しかし、この
処理方法では、被処理水をpH調整槽と処理槽に循環さ
せながら数時間滞留させる必要があるため、処理効率が
極めて低いうえ、pH調整槽と処理槽の併用で設備が大
型化するという欠点があった。
The above-mentioned Patent No. 287 described above.
According to the method described in Japanese Patent No. 4126, dioxins can be oxidized and removed by 80% or more. However, in this treatment method, it is necessary to circulate the water to be treated for several hours while circulating the water to be treated in the pH adjustment tank and the treatment tank. Therefore, the treatment efficiency is extremely low, and the equipment becomes large due to the combined use of the pH adjustment tank and the treatment tank. Had the disadvantage of doing so.

【0005】本発明は、このような従来の事情に鑑み、
複数の槽を必要としない小型の設備を用いて、排水中の
ダイオキシン類等の有機塩素化合物を短時間で効率良く
除去することのできる有機塩素化合物の処理方法を提供
することを目的とする。
The present invention has been made in view of such a conventional situation,
An object of the present invention is to provide a method for treating an organic chlorine compound that can efficiently remove an organic chlorine compound such as dioxins in wastewater in a short time by using a small facility that does not require a plurality of tanks.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するた
め、本発明が提供する排水中の有機塩素化合物の処理方
法は、反応槽に導入した被処理水をpH6〜10に調整
しながら、該反応槽内で紫外線照射下にオゾンを連続的
に供給して、有機塩素化合物を除去することを特徴とす
る。
In order to achieve the above object, the present invention provides a method for treating an organochlorine compound in wastewater, which comprises adjusting the pH of the water to be treated introduced into the reaction tank to pH 6 to 10 while adjusting the pH of the water to be treated. The method is characterized in that ozone is continuously supplied in a reaction tank under irradiation with ultraviolet rays to remove organic chlorine compounds.

【0007】上記本発明の処理方法においては、反応槽
内の被処理水1リットル当たり300mg以上のオゾン
を連続的に供給することが好ましく、また渦流ポンプを
用いて被処理水中にオゾンを混合させながら反応槽に導
入することが好ましい。
In the treatment method of the present invention, it is preferable to continuously supply 300 mg or more of ozone per liter of the water to be treated in the reaction tank, and to mix ozone into the water to be treated by using a vortex pump. It is preferable to introduce into the reaction tank while the reaction is being performed.

【0008】[0008]

【発明の実施の形態】本発明方法では、ダイオキシン類
等の有機塩素化合物を含む産業排水のような被処理水を
ポンプにより反応槽に導入し、この反応槽内で被処理水
に紫外線を照射しながらオゾンと接触させる。反応槽内
では、紫外線とオゾンの反応により、オゾンよりも更に
酸化力の強いヒドロキシラジカルが生成し、これにより
ダイオキシン類等の有機塩素化合物が酸化され、分子量
の小さい物質に分解されて除去される。
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method of the present invention, water to be treated such as industrial wastewater containing an organic chlorine compound such as dioxins is introduced into a reaction tank by a pump, and the water to be treated is irradiated with ultraviolet rays in the reaction tank. While contacting with ozone. In the reaction tank, a reaction between ultraviolet rays and ozone generates hydroxyl radicals having a stronger oxidizing power than ozone, thereby oxidizing organic chlorine compounds such as dioxins and decomposing them into substances having a small molecular weight and removing them. .

【0009】その際、ダイオキシン類はアルカリ領域の
方が分解しやすいうえ、有機塩素化合物をはじめとする
有機化合物の分解により生成する二酸化炭素等によって
被処理水のpHが低下するため、反応槽内の被処理水の
pHを常に6〜10の範囲に調整する。被処理水のpH
が6未満ではダイオキシン類の分解効率が低下し、その
分解により塩素ガスが発生する可能性がある。逆にpH
が10を超えると、反応槽内に金属水酸化物等の沈澱物
が生じやすく、これにより紫外線照射の効率が低下する
からである。
At this time, dioxins are more easily decomposed in the alkaline region, and the pH of the water to be treated is lowered by carbon dioxide and the like generated by decomposition of organic compounds such as organic chlorine compounds. The pH of the water to be treated is always adjusted to the range of 6 to 10. PH of water to be treated
Is less than 6, the decomposition efficiency of dioxins decreases, and chlorine gas may be generated by the decomposition. Conversely, pH
Is more than 10, precipitates such as metal hydroxides are liable to be formed in the reaction tank, which lowers the efficiency of ultraviolet irradiation.

【0010】被処理水のpH調整は、反応槽内の被処理
水のpHを測定しながら、常に上記pH6〜10の範囲
となるように、好ましくはpH9〜10の範囲となるよ
うに、水酸化ナトリウム等のアルカリや塩酸そのたの酸
のようなpH調整液を添加して行う。具体的には、pH
電極とpH調整液及びその供給ポンプを備えたpHコン
トローラを反応槽に設置し、反応槽内の被処理水のpH
変動に対応してpH調整液を供給する方法が好ましい。
The pH of the water to be treated is adjusted such that the pH of the water to be treated is always in the range of 6 to 10 described above, preferably in the range of 9 to 10 while measuring the pH of the water to be treated in the reaction tank. This is performed by adding a pH adjusting solution such as an alkali such as sodium oxide or hydrochloric acid or another acid. Specifically, pH
A pH controller equipped with an electrode, a pH adjusting liquid and a supply pump for the same is installed in the reaction tank, and the pH of the water to be treated in the reaction tank is adjusted.
A method of supplying a pH adjusting liquid according to the fluctuation is preferable.

【0011】反応槽へのオゾン供給量は、反応槽内の被
処理水1リットル当たり300mg以上、好ましくは3
50〜500mgのオゾンを連続的に供給することが好
ましい。オゾン供給量が300mg/lより少ないと、
有機塩素化合物の分解効率が低下するため、反応槽内で
の滞留時間が長くなり、ダイオキシン類等を短時間で効
率良く除去することが難しくなるからである。
[0011] The amount of ozone supplied to the reaction tank is 300 mg or more, preferably 3 mg / liter of water to be treated in the reaction tank.
It is preferable to continuously supply 50 to 500 mg of ozone. If the ozone supply is less than 300 mg / l,
This is because the decomposition efficiency of the organic chlorine compound is reduced, so that the residence time in the reaction tank is increased, and it becomes difficult to efficiently remove dioxins and the like in a short time.

【0012】また、被処理水にオゾンを供給する方法と
しては、パイプ等に穿設した多数の気孔から放出する散
気管方式、ノズルから噴出させるエジョクター方式、渦
流ポンプを用いて被処理水中にオゾンを混合させるター
ボミキシング方式等を用いることができる。特にターボ
ミキシング方式により渦流ポンプを用いてオゾンを被処
理水に混合させ、このオゾンを混合した被処理水を反応
槽に供給すれば、より一層短時間で効率的なダイオキシ
ン類の除去が可能となる。
The method of supplying ozone to the water to be treated is as follows: a diffuser pipe system that discharges from a large number of holes formed in a pipe or the like; an ejector system that ejects from a nozzle; Can be used. In particular, if ozone is mixed with the water to be treated using a vortex pump by a turbo mixing method and the water to be treated mixed with the ozone is supplied to the reaction tank, dioxins can be removed more efficiently in a shorter time. Become.

【0013】被処理水への紫外線の照射には紫外線ラン
プを使用し、185nmあるいは254nmの紫外線を
照射することが好ましい。また、反応槽内の被処理水全
体に十分な紫外線照射が行われるように、反応槽の大き
さに応じて紫外線ランプの設置数及び設置間隔を適宜調
整することが望ましい。
It is preferable to use an ultraviolet lamp to irradiate the water to be treated with ultraviolet rays, and to irradiate ultraviolet rays of 185 nm or 254 nm. Further, it is desirable to appropriately adjust the number and intervals of the ultraviolet lamps to be installed in accordance with the size of the reaction tank so that sufficient ultraviolet irradiation is performed on the whole of the water to be treated in the reaction tank.

【0014】上記した本発明方法は、バッチ式で行うの
が簡単であるが、被処理水を反応槽に連続的に供給し、
反応槽の上部からオーバーフローさせる連続処理も可能
である。バッチ処理又は連続処理のいずれでも、難分解
性のダイオキシン類の含有量が多いなど、ある程度の滞
留時間を必要とする場合には、渦流ポンプ等のポンプを
用いて反応槽内で被処理水を循環させることが好まし
い。
The above-mentioned method of the present invention is easy to carry out in a batch system, but the water to be treated is continuously supplied to the reaction tank,
It is also possible to perform a continuous process in which the reaction vessel overflows from the top. In either batch processing or continuous processing, when a certain amount of residence time is required, such as when the content of dioxins that are difficult to decompose is large, use a pump such as a vortex pump to remove the water to be treated in the reaction tank. Circulation is preferred.

【0015】[0015]

【実施例】産業排水を凝集処理及び生物分解処理し、得
られた排水を被処理水とした。この被処理水は、ダイオ
キシン濃度が6000pg/l(毒性等価換算係数TE
Q130pg/l)、CODが15mg/lであり、p
H8.3であった。
EXAMPLES Industrial wastewater was subjected to coagulation treatment and biodegradation treatment, and the resulting wastewater was used as water to be treated. This treated water has a dioxin concentration of 6000 pg / l (toxic equivalent conversion coefficient TE
Q130 pg / l), COD is 15 mg / l, p
H8.3.

【0016】この被処理水を、図1に示すように、内部
に紫外線出力約3.5Wの紫外線ランプ2を3本配置し
た有効容積10リットルの反応槽1の下部に渦流ポンプ
3を用いて連続的に導入すると共に、反応槽1内の被処
理水の一部を渦流ポンプ3により循環させた。また、反
応槽1の上部からは、処理済水をオーバーフローさせ
た。
As shown in FIG. 1, the water to be treated is treated with a vortex pump 3 at the lower part of a reaction tank 1 having an effective volume of 10 liters, in which three ultraviolet lamps 2 each having an ultraviolet output of about 3.5 W are arranged. While being introduced continuously, a part of the water to be treated in the reaction tank 1 was circulated by the vortex pump 3. The treated water overflowed from the upper part of the reaction tank 1.

【0017】その際、反応槽1内の被処理水1リットル
当たり350mgのオゾンを渦流ポンプ3に連続的に供
給し、渦流ポンプ3内で被処理水に混合させた。また、
反応槽1に(株)日伸理化製のpHコントローラ4(N
PH−680D)を設置し、pH電極5で反応槽1内の
被処理水のpHを常時測定し、測定されたpHに応じて
ポンプ6でpH調整液を供給することにより、被処理水
のpHを常に6〜8の間に制御した。
At this time, 350 mg of ozone per liter of the water to be treated in the reaction tank 1 was continuously supplied to the vortex pump 3 and mixed with the water to be treated in the vortex pump 3. Also,
In the reaction tank 1, a pH controller 4 (N
PH-680D) is installed, the pH of the water to be treated in the reaction tank 1 is constantly measured by the pH electrode 5, and the pH adjusting liquid is supplied by the pump 6 according to the measured pH. The pH was always controlled between 6-8.

【0018】このようにして、被処理水の反応槽1内の
滞留時間を約15分に調整して処理した結果、反応槽1
からオーバーフローした処理済水中に含まれるダイオキ
シン濃度は1100pg/l(TEQ28pg/l)と
なり、約80%のダイオキシンを除去することができ
た。また、この処理操作中、沈澱物や塩素ガスの発生は
認められなかった。
In this way, the water to be treated is treated with the residence time in the reaction tank 1 being adjusted to about 15 minutes.
The concentration of dioxin contained in the treated water overflowing from became 1100 pg / l (TEQ 28 pg / l), and about 80% of dioxin could be removed. Further, during this treatment operation, generation of a precipitate or chlorine gas was not recognized.

【0019】[0019]

【発明の効果】本発明によれば、一つの反応槽のみを用
いる短時間の処理で、排水中のダイオキシン類等の有機
塩素化合物を効率良く除去することができる。特に、オ
ゾン供給量を高め且つ渦流ポンプでオゾンを被処理水に
混合することにより、更に短い滞留時間で効率的にダイ
オキシン類等の有機塩素化合物を除去することが可能で
ある。
According to the present invention, organic chlorine compounds such as dioxins in waste water can be efficiently removed by a short-time treatment using only one reaction tank. In particular, by increasing the supply amount of ozone and mixing ozone with the water to be treated by the vortex pump, it is possible to efficiently remove organic chlorine compounds such as dioxins with a shorter residence time.

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

【図1】本発明方法を実施するための装置の一具体例を
示す概略の側面図である。
FIG. 1 is a schematic side view showing one specific example of an apparatus for carrying out the method of the present invention.

【符号の説明】[Explanation of symbols]

1 反応槽 2 紫外線ランプ 3 渦流ポンプ 4 pHコントローラ 5 pH電極 6 ポンプ DESCRIPTION OF SYMBOLS 1 Reaction tank 2 Ultraviolet lamp 3 Eddy current pump 4 pH controller 5 pH electrode 6 Pump

フロントページの続き Fターム(参考) 4D037 AA11 AB14 BA18 BB01 CA12 CA14 4D038 AA08 AB14 BA02 BA06 BB07 BB13 BB16 4D050 AA12 AB19 BB02 BC09 BD02 BD03 BD08 CA13 Continued on the front page F term (reference) 4D037 AA11 AB14 BA18 BB01 CA12 CA14 4D038 AA08 AB14 BA02 BA06 BB07 BB13 BB16 4D050 AA12 AB19 BB02 BC09 BD02 BD03 BD08 CA13

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 排水中に含まれるダイオキシン類等の有
機塩素化合物の処理方法であって、反応槽に導入した被
処理水をpH6〜10に調整しながら、該反応槽内で紫
外線照射下にオゾンを連続的に供給して、有機塩素化合
物を除去することを特徴とする排水中の有機塩素化合物
の処理方法。
1. A method for treating an organic chlorine compound such as dioxins contained in waste water, wherein the water to be treated introduced into the reaction tank is adjusted to pH 6 to 10 while being irradiated with ultraviolet light in the reaction tank. A method for treating organic chlorine compounds in wastewater, comprising continuously supplying ozone to remove organic chlorine compounds.
【請求項2】 反応槽内の被処理水1リットル当たり3
00mg以上のオゾンを連続的に供給することを特徴と
する、請求項1に記載の排水中の有機塩素化合物の処理
方法。
2. 3 to 1 liter of water to be treated in a reaction tank
The method for treating organic chlorine compounds in wastewater according to claim 1, wherein ozone of at least 00 mg is supplied continuously.
【請求項3】 渦流ポンプを用いて被処理水中にオゾン
を混合させながら反応槽に導入することを特徴とする、
請求項1又は2に記載の排水中の有機塩素化合物の処理
方法。
3. Mixing ozone into the water to be treated using a vortex pump while introducing the ozone into the reaction tank.
The method for treating an organic chlorine compound in wastewater according to claim 1 or 2.
JP11204378A 1999-07-19 1999-07-19 Treatment of organochlorine compound in wastewater Pending JP2001029969A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11204378A JP2001029969A (en) 1999-07-19 1999-07-19 Treatment of organochlorine compound in wastewater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11204378A JP2001029969A (en) 1999-07-19 1999-07-19 Treatment of organochlorine compound in wastewater

Publications (1)

Publication Number Publication Date
JP2001029969A true JP2001029969A (en) 2001-02-06

Family

ID=16489543

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11204378A Pending JP2001029969A (en) 1999-07-19 1999-07-19 Treatment of organochlorine compound in wastewater

Country Status (1)

Country Link
JP (1) JP2001029969A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1304892C (en) * 2002-02-04 2007-03-14 三井化学株式会社 Method for producing liquid crystal display cell and sealing agent for liquid crystal display cell
US9526936B2 (en) 2012-11-20 2016-12-27 Osaka City University Method for hydrothermal oxidation treatment for organic halogen compound
CN111876263A (en) * 2020-08-19 2020-11-03 四川金尚环保科技有限公司 Large-scale continuous treatment system and method for organic chlorine high-content waste animal and vegetable oil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1304892C (en) * 2002-02-04 2007-03-14 三井化学株式会社 Method for producing liquid crystal display cell and sealing agent for liquid crystal display cell
US9526936B2 (en) 2012-11-20 2016-12-27 Osaka City University Method for hydrothermal oxidation treatment for organic halogen compound
CN111876263A (en) * 2020-08-19 2020-11-03 四川金尚环保科技有限公司 Large-scale continuous treatment system and method for organic chlorine high-content waste animal and vegetable oil

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