JPH11309497A - Method for recovering dioxins in sludge - Google Patents
Method for recovering dioxins in sludgeInfo
- Publication number
- JPH11309497A JPH11309497A JP10119792A JP11979298A JPH11309497A JP H11309497 A JPH11309497 A JP H11309497A JP 10119792 A JP10119792 A JP 10119792A JP 11979298 A JP11979298 A JP 11979298A JP H11309497 A JPH11309497 A JP H11309497A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- dioxins
- organic solvent
- separated
- concentrated
- 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
- Fire-Extinguishing Compositions (AREA)
- Extraction Or Liquid Replacement (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、浸出水処理汚泥な
どの汚泥中のダイオキシン類の除去方法に関する。The present invention relates to a method for removing dioxins in sludge such as leachate-treated sludge.
【０００２】[0002]
【従来の技術】一般廃棄物や産業廃棄物を埋立てた廃棄
物最終処分場の浸出水など、ダイオキシン類を含んだ汚
水は、たとえば、夾雑物や砂等を除去し、カルシウムや
マンガンなどの重金属類を凝集沈殿させ、ＢＯＤ物質や
Ｔ−Ｎを生物処理により分解し、ＣＯＤ物質や浮遊物質
やＴ−Ｐなどを凝集沈殿させ、微細な浮遊物質を砂濾過
により除去し、残存するダイオキシン類の他、ＣＯＤ物
質や色度成分などをオゾン・紫外線および活性炭により
除去してから放流している。このとき生物処理やその前
後の凝集沈殿処理で発生した汚泥は、濃縮し、脱水した
後に、処分場に埋め立て処分している。2. Description of the Related Art Sewage containing dioxins, such as leachate from landfills where landfills of general and industrial wastes are landfilled, removes impurities and sand, for example, and removes calcium, manganese, etc. Heavy metals are coagulated and precipitated, BOD substances and TN are decomposed by biological treatment, COD substances, suspended substances and TP are coagulated and precipitated, fine suspended substances are removed by sand filtration, and residual dioxins are removed. In addition, COD substances, chromaticity components and the like are removed by ozone / ultraviolet rays and activated carbon before being discharged. At this time, the sludge generated by the biological treatment and the coagulation and sedimentation treatment before and after the treatment is concentrated, dehydrated, and then disposed of in a landfill.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
た浸出水処理で発生した汚泥など、ダイオキシン類を含
んだ汚泥を埋め立てると、ダイオキシン類が埋立地内に
蓄積するだけでなく、再び浸出水中に溶出する恐れがあ
る。However, when reclaiming sludge containing dioxins such as the sludge generated in the above leachate treatment, the dioxins not only accumulate in the landfill but also elute in the leachate again. There is fear.
【０００４】本発明は上記問題を解決するもので、汚泥
中のダイオキシン類を除去し、埋立地におけるダイオキ
シン類の蓄積および溶出を防止することを目的とするも
のである。An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to remove dioxins in sludge and prevent accumulation and elution of dioxins in a landfill.
【０００５】[0005]
【課題を解決するための手段】上記問題を解決するため
に、本発明の汚泥中のダイオキシン類の除去方法は、ダ
イオキシン類を含んだ汚泥を有機溶媒と混合し、この汚
泥混合液に超音波を照射して汚泥中のダイオキシン類を
有機溶媒中に抽出する抽出工程と、前記抽出工程を終え
た汚泥混合液より有機溶媒を分離して、ダイオキシン類
が除去された汚泥を回収する分離回収工程とを行い、前
記分離回収工程で分離した有機溶媒は前記超音波抽出工
程に返送して再使用に供するようにしたものである。In order to solve the above problems, a method for removing dioxins in sludge according to the present invention comprises mixing a dioxin-containing sludge with an organic solvent, and adding an ultrasonic wave to the sludge mixture. And extracting the dioxins in the sludge into an organic solvent by irradiating the organic solvent from the sludge mixture after the extraction step, and collecting the sludge from which the dioxins have been removed. And the organic solvent separated in the separation and recovery step is returned to the ultrasonic extraction step for reuse.
【０００６】上記した方法によれば、超音波の振動エネ
ルギーによって汚泥の表面や内部に取り込まれたダイオ
キシン類が分離され、有機溶媒中に移行するので、この
有機溶媒を分離することで、ダイオキシン類が除去され
た汚泥を回収できる。このとき分離される有機溶媒はダ
イオキシン類を飽和状態まで含んでいないので、この有
機溶媒を再使用して汚泥中のダイオキシン類を抽出でき
る。そして、このようにして有機溶媒を再使用すること
により、有機溶媒の使用量を低減することができ、有機
溶媒のコストはもちろんのこと、有機溶媒自体の処理に
要する時間およびコストを削減できる。[0006] According to the above-mentioned method, dioxins taken into the surface or inside of sludge are separated by the vibrational energy of ultrasonic waves and transferred into an organic solvent. Therefore, dioxins are separated by separating the organic solvent. The sludge from which has been removed can be recovered. Since the organic solvent separated at this time does not contain dioxins to a saturated state, the organic solvent can be reused to extract dioxins in sludge. By reusing the organic solvent in this manner, the amount of the organic solvent used can be reduced, and the cost and time required for the treatment of the organic solvent itself can be reduced, as well as the cost of the organic solvent.
【０００７】有機溶媒としては、ジエチレングリコー
ル，ＤＭＳＯなどの親水性有機溶媒を使用することがで
き、脱水汚泥１ｇ（乾燥汚泥ベース）に対して約１００
ｍｌの割合で使用する。超音波としては、約２０〜１０
０ｋHzを照射すればよい。As the organic solvent, a hydrophilic organic solvent such as diethylene glycol or DMSO can be used, and about 100 g per 1 g of dewatered sludge (dry sludge base).
Use at the rate of ml. About 20 to 10
Irradiation at 0 kHz may be performed.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施形態を図面を
参照しながら説明する。図１はダイオキシン類を含んだ
浸出水の処理フローを示し、浸出水を前処理設備１に導
入して夾雑物や砂等を除去し、カルシウム除去設備２に
導入してカルシウムやマンガンなどの重金属類を凝集沈
殿させ、上澄水たるカルシウム除去水３を生物処理設備
４に導入してＢＯＤ物質やＴ−Ｎを微生物により分解除
去し、得られる生物処理水５を凝集沈殿処理設備６に導
入してＣＯＤ物質や浮遊物質やＴ−Ｐなどを凝集沈殿さ
せ、上澄水たる凝沈処理水７を砂濾過塔８に導入して微
細な浮遊物質を除去した後、オゾン・紫外線反応塔９，
活性炭吸着塔１０に順次導入して、残存するダイオキシ
ン類の他、ＣＯＤ物質や色度成分などを除去し、処理水
１１として放流する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a treatment flow of leachate containing dioxins. Leachate is introduced into a pretreatment facility 1 to remove impurities and sand, and is introduced into a calcium removal facility 2 to introduce heavy metals such as calcium and manganese. Are aggregated and sedimented, and calcium-free water 3 as supernatant water is introduced into the biological treatment equipment 4 to decompose and remove BOD substances and TN by microorganisms. COD substances, suspended substances, TP and the like are coagulated and settled, and coagulated water 7 as supernatant water is introduced into a sand filtration tower 8 to remove fine suspended substances.
The CO2 is introduced into the activated carbon adsorption tower 10 in order to remove remaining dioxins, COD substances, chromaticity components, and the like.
【０００９】このときカルシウム除去設備２，生物処理
設備４，凝集沈殿処理設備６でそれぞれ発生した汚泥１
２，１３，１４は、図２に示したように、汚泥濃縮槽１
５に投入して静置し、それにより濃縮された濃縮汚泥１
６を汚泥貯留槽１７に移送して一旦貯留した後、脱水助
剤１８を添加して汚泥脱水機１９で脱水することによ
り、脱水汚泥２０とする。At this time, the sludge 1 generated in the calcium removal equipment 2, the biological treatment equipment 4, and the coagulation / sedimentation treatment equipment 6, respectively.
2, 13, 14 are sludge concentration tanks 1 as shown in FIG.
5 and allowed to stand, and thereby the concentrated sludge 1
6 is transferred to a sludge storage tank 17 and once stored therein, and then a dewatering aid 18 is added thereto and dewatered by a sludge dewatering machine 19 to obtain dewatered sludge 20.
【００１０】汚泥濃縮槽１５，汚泥貯留槽１７，汚泥脱
水機１９で分離された濃縮分離液２１，２２や脱水濾液
２３は上述した前処理設備１に返送して、上記の一連の
浸出水処理を行う。The concentrated separated liquids 21, 22 and the dehydrated filtrate 23 separated in the sludge concentration tank 15, the sludge storage tank 17, and the sludge dewatering machine 19 are returned to the above-mentioned pretreatment equipment 1, and subjected to the above-described series of leachate treatment. I do.
【００１１】一方、脱水汚泥２０は、超音波発生装置を
備えた超音波抽出槽２４に投入して、槽内に注入する有
機溶媒２５中に１〜１０％の割合で懸濁する。そして槽
内の汚泥混合液に対して超音波発生装置より約２０〜１
００ｋHzの超音波を照射することによって、脱水汚泥２
０の表面や内部に取り込まれたダイオキシン類を超音波
の振動エネルギーによって分離させ、有機溶媒２５中に
移行させる。On the other hand, the dewatered sludge 20 is put into an ultrasonic extraction tank 24 equipped with an ultrasonic generator, and is suspended at a ratio of 1 to 10% in an organic solvent 25 injected into the tank. And about 20 ~ 1 from the ultrasonic generator for the sludge mixed liquid in the tank
By irradiating 00 kHz ultrasonic wave, dehydrated sludge 2
The dioxins taken into the surface or inside of the substrate 0 are separated by the vibration energy of the ultrasonic wave and transferred into the organic solvent 25.
【００１２】その後、超音波抽出槽２４より汚泥混合液
２６を汚泥濃縮槽２７に移送して静置し、それにより濃
縮された濃縮汚泥２８を汚泥洗浄・濃縮槽２９に移送
し、洗浄水３０を用いて洗浄した後に静置し、それによ
り濃縮された濃縮汚泥３１を脱水助剤３２を添加して汚
泥脱水機３３で脱水し、汚泥脱水機３３より排出される
脱水汚泥３４を埋立地へと搬出する。Thereafter, the sludge mixed liquid 26 is transferred from the ultrasonic extraction tank 24 to the sludge concentration tank 27 and allowed to stand, and the concentrated sludge 28 thus concentrated is transferred to the sludge washing / concentration tank 29 and the washing water 30 is removed. After being washed with, the concentrated sludge 31 thus concentrated is added with a dewatering aid 32 and dewatered by a sludge dewaterer 33, and the dewatered sludge 34 discharged from the sludge dewaterer 33 is transferred to a landfill. And carry it out.
【００１３】汚泥濃縮槽２７で分離された濃縮分離液３
５は、超音波抽出槽２４に返送して抽出に再使用する。
汚泥洗浄・濃縮槽２９，汚泥脱水機３３でそれぞれ分離
された濃縮分離液３６，脱水濾液３７は上述した前処理
設備１に返送して、上記の一連の浸出水処理を行い、そ
れにより各液３６，３７中に含まれる有機溶媒を生物処
理設備４において微生物により分解除去し、有機溶媒中
に抽出されたダイオキシン類をオゾン・紫外線反応塔９
においてオゾン酸化と紫外線照射とにより分解除去す
る。The concentrated separation liquid 3 separated in the sludge concentration tank 27
5 is returned to the ultrasonic extraction tank 24 and reused for extraction.
The concentrated separated liquid 36 and the dehydrated filtrate 37 separated by the sludge washing / concentrating tank 29 and the sludge dewatering machine 33 are returned to the above-mentioned pretreatment equipment 1 and subjected to the above-mentioned series of leachate treatments. The organic solvent contained in 36, 37 is decomposed and removed by microorganisms in the biological treatment equipment 4, and the dioxins extracted in the organic solvent are removed from the ozone / ultraviolet reaction tower 9
And decompose and remove by ozone oxidation and ultraviolet irradiation.
【００１４】再使用した濃縮分離液３５より派生する濃
縮分離液３５ａ，３６ａ，脱水濾液３７ａは、上記と同
様に前処理設備１に返送して、上記の一連の浸出水処理
を行う。The concentrated separated liquids 35a and 36a derived from the reused concentrated separated liquid 35 and the dehydrated filtrate 37a are returned to the pretreatment equipment 1 in the same manner as described above to perform the above-described series of leachate treatment.
【００１５】このようにして、浸出水処理で発生した汚
泥１２，１３，１４中に含まれるダイオキシン類を抽出
し、分離して、分解・除去できるとともに、有機溶媒の
使用量を低減することができ、有機溶媒のコストはもち
ろんのこと、有機溶媒自体の処理に要する時間およびコ
ストを削減できる。また、有機溶媒によりダイオキシン
類を抽出する際に、ダイオキシン類以外の有機・無機汚
濁成分も抽出されるので、これらの汚濁成分の埋立地へ
の搬入も低減できる。In this way, dioxins contained in the sludge 12, 13, 14 generated in the leachate treatment can be extracted, separated, decomposed and removed, and the amount of organic solvent used can be reduced. The time and cost required for processing the organic solvent itself can be reduced, as well as the cost of the organic solvent. Further, when dioxins are extracted with an organic solvent, organic and inorganic pollutants other than dioxins are also extracted, so that the transport of these pollutants to a landfill can be reduced.
【００１６】なお、上記においては汚泥混合液２６を汚
泥濃縮槽２７に導入して濃縮したが、遠心濃縮機を用い
て濃縮すれば汚泥と有機溶媒２５とを効率よく分離でき
る。In the above description, the sludge mixture 26 is introduced into the sludge concentration tank 27 and concentrated. However, if the mixture is concentrated using a centrifugal concentrator, the sludge and the organic solvent 25 can be efficiently separated.
【００１７】[0017]
【発明の効果】以上のように、本発明によれば、汚泥中
のダイオキシン類を超音波照射によって有機溶媒中に抽
出し、この有機溶媒を汚泥より分離して再使用するよう
にしたことにより、ダイオキシン類が除去された汚泥を
回収できるとともに、有機溶媒を有効利用してその使用
量を低減することができ、有機溶媒のコストはもちろん
のこと、有機溶媒の処理に要する時間およびコストを削
減できる。As described above, according to the present invention, dioxins in sludge are extracted into an organic solvent by ultrasonic irradiation, and the organic solvent is separated from the sludge and reused. , Sludge from which dioxins have been removed can be recovered, and the amount of organic solvent used can be reduced by effectively utilizing the organic solvent. This not only reduces the cost of the organic solvent, but also reduces the time and cost required for processing the organic solvent. it can.
【００１８】また、有機溶媒によりダイオキシン類を抽
出する際に、ダイオキシン類以外の有機・無機汚濁成分
も抽出されるので、汚泥埋立地に持ち込まれるダイオキ
シ類およびその他の汚濁成分を低減することができ、環
境上望ましいのはもちろんのこと、管理上のリスクを軽
減できる。In addition, when dioxins are extracted with an organic solvent, organic and inorganic pollutants other than dioxins are also extracted, so that dioxins and other pollutants brought into a sludge landfill can be reduced. It reduces environmental risks as well as administrative risks.
【図１】本発明の実施対象たる汚泥の発生を説明するフ
ローチャートである。FIG. 1 is a flowchart illustrating generation of sludge as an embodiment of the present invention.
【図２】本発明の一実施形態における汚泥中のダイオキ
シン類の除去方法を説明するフローチャートである。FIG. 2 is a flowchart illustrating a method for removing dioxins in sludge according to one embodiment of the present invention.
４ 生物処理設備 ９ オゾン・紫外線反応塔 20 脱水汚泥 24 超音波抽出槽 25 有機溶媒 35, 36 濃縮分離液 37 脱水濾液 4 Biological treatment equipment 9 Ozone / ultraviolet ray reaction tower 20 Dewatered sludge 24 Ultrasonic extraction tank 25 Organic solvent 35, 36 Concentrated separated liquid 37 Dewatered filtrate
Claims (1)
と混合し、この汚泥混合液に超音波を照射して汚泥中の
ダイオキシン類を有機溶媒中に抽出する抽出工程と、前
記抽出工程を終えた汚泥混合液より有機溶媒を分離し
て、ダイオキシン類が除去された汚泥を回収する分離回
収工程とを行い、前記分離回収工程で分離した有機溶媒
は前記超音波抽出工程に返送して再使用に供することを
特徴とする汚泥中のダイオキシン類の除去方法。1. An extraction step of mixing dioxin-containing sludge with an organic solvent, irradiating ultrasonic waves to the sludge mixture to extract dioxins in the sludge into the organic solvent, and completing the extraction step. Separating the organic solvent from the mixed sludge mixture, and recovering the sludge from which dioxins have been removed.The organic solvent separated in the separation and recovery step is returned to the ultrasonic extraction step for reuse. A method for removing dioxins in sludge, the method comprising subjecting the sludge to dioxin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11979298A JP3444782B2 (en) | 1998-04-30 | 1998-04-30 | Removal method of dioxins in sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11979298A JP3444782B2 (en) | 1998-04-30 | 1998-04-30 | Removal method of dioxins in sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11309497A true JPH11309497A (en) | 1999-11-09 |
| JP3444782B2 JP3444782B2 (en) | 2003-09-08 |
Family
ID=14770346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11979298A Expired - Fee Related JP3444782B2 (en) | 1998-04-30 | 1998-04-30 | Removal method of dioxins in sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3444782B2 (en) |
-
1998
- 1998-04-30 JP JP11979298A patent/JP3444782B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3444782B2 (en) | 2003-09-08 |
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