JP3444782B2 - Removal method of dioxins in sludge - Google Patents
Removal method of dioxins in sludgeInfo
- Publication number
- JP3444782B2 JP3444782B2 JP11979298A JP11979298A JP3444782B2 JP 3444782 B2 JP3444782 B2 JP 3444782B2 JP 11979298 A JP11979298 A JP 11979298A JP 11979298 A JP11979298 A JP 11979298A JP 3444782 B2 JP3444782 B2 JP 3444782B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- dioxins
- organic solvent
- separated
- biological 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.)
- Expired - Fee Related
Links
Landscapes
- Fire-Extinguishing Compositions (AREA)
- Extraction Or Liquid Replacement (AREA)
- Treatment Of Sludge (AREA)
Description
【発明の詳細な説明】
【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。
【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。
【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。
【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。
【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、汚
水中のＢＯＤ、Ｔ−Ｎを分解除去する生物処理工程と、
有機塩素化合物を分解除去するオゾン・紫外線処理工程
と、生物処理工程で発生した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超
音波抽出工程と、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
を回収する汚泥濃縮工程と、汚泥濃縮工程で回収した汚
泥を洗浄して濃縮する汚泥洗浄・濃縮工程とを行い、汚
泥濃縮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し、汚泥洗浄・濃縮工程で分離した
濃縮分離液は生物処理工程およびオゾン・紫外線処理工
程に返送して生物処理工程で有機溶媒を分解除去し、オ
ゾン・紫外線処理工程で有機溶媒に含まれたダイオキシ
ン類を分解除去するようにしたものである。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing dioxins in sludge such as leachate-treated sludge. 2. Description of the Related Art Sewage containing dioxins, such as leachate from a landfill for final disposal of general waste and industrial waste, removes foreign substances and sand, for example, and removes calcium and calcium. Heavy metals such as manganese are coagulated and precipitated, BOD substances and TN are decomposed by biological treatment, COD substances and suspended substances and TP are coagulated and precipitated, fine suspended substances are removed by sand filtration, and the remaining In addition to dioxins, COD substances and chromatic components 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 sedimentation treatment before and after the treatment is concentrated, dewatered, and then disposed of in a landfill. [0003] However, when landfilling sludge containing dioxins, such as the sludge generated in the above leachate treatment, not only accumulates dioxins in the landfill site, but also reclaims leachate water. May be eluted. An object of the present invention is to solve the above-mentioned problems and to remove dioxins in sludge and prevent accumulation and elution of dioxins in a landfill. [0005] In order to solve the above problems [Means for Solving the Problems], method for removing dioxins in the sludge of the present invention, fouling
A biological treatment step of decomposing and removing BOD and TN in water;
Ozone / ultraviolet treatment process to decompose and remove organic chlorine compounds
If, super mixed sludge containing dioxins generated in the biological treatment step with an organic solvent to extract the dioxins in the sludge by irradiation with ultrasonic waves to the sludge mixture in an organic solvent
An ultrasonic extraction step, a sludge concentration step of separating an organic solvent from the sludge mixture after the extraction step, and collecting sludge from which dioxins have been removed, and a sludge collection step of the sludge concentration step.
It performed and sludge washing and concentration step of concentrating washed mud, organic solvent separated in the sludge concentration step is subjected to back and reused to the ultrasonic extraction step and separated sludge washing and concentration step
The concentrated separation liquid is used for biological treatment and ozone / ultraviolet treatment.
The organic solvent is decomposed and removed in the biological treatment process.
Dioxy contained in organic solvents in the zoning / ultraviolet treatment process
The components are decomposed and removed . [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 time and cost required for the treatment of the organic solvent itself can be reduced, as well as the cost of the organic solvent. 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 dehydrated sludge (dry sludge base).
Use at the rate of ml. About 20 to 10
Irradiation at 0 kHz may be performed. 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. 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 temporarily stored therein, and then a dehydration aid 18 is added thereto and dewatered by a sludge dewatering machine 19 to obtain a dewatered sludge 20. 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. On the other hand, the dewatered sludge 20 is put into an ultrasonic extraction tank 24 equipped with an ultrasonic generator, and 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. 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 using, the concentrated sludge 31 thus concentrated is added with a dewatering aid 32 and dewatered by a sludge dewatering machine 33, and the dewatered sludge 34 discharged from the sludge dewatering machine 33 is transferred to a landfill. And carry it out. 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. 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. As described above, dioxins contained in the sludge 12, 13, 14 generated in the leachate treatment can be extracted, separated, decomposed and removed, and the amount of the organic solvent used can be reduced. The time and cost required for treating 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. 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. 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. By doing so, the 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. Costs can be reduced. Further, 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.
【図面の簡単な説明】
【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。
【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。
【符号の説明】
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart illustrating generation of sludge as an embodiment of the present invention. FIG. 2 is a flowchart illustrating a method for removing dioxins in sludge according to one embodiment of the present invention. [Description of Signs] 4 Biological treatment equipment 9 Ozone / ultraviolet ray reaction tower 20 Dehydration sludge 24 Ultrasonic extraction tank 25 Organic solvent 35, 36 Concentrated separation liquid 37 Dehydration filtrate
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−108285（ＪＰ，Ａ) 特開 平８−145985（ＪＰ，Ａ) 特開 平４−312475（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 11/12 ZAB ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-108285 (JP, A) JP-A-8-145598 (JP, A) JP-A-4-312475 (JP, A) (58) Survey Field (Int.Cl. 7 , DB name) C02F 11/12 ZAB
Claims (1)
生物処理工程と、有機塩素化合物を分解除去するオゾン
・紫外線処理工程と、生物処理工程で発生したダイオキ
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
媒中に抽出する超音波抽出工程と、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汚泥濃縮工程と、汚泥濃縮
工程で回収した汚泥を洗浄して濃縮する汚泥洗浄・濃縮
工程とを行い、汚泥濃縮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し、汚泥洗浄・濃
縮工程で分離した濃縮分離液は生物処理工程およびオゾ
ン・紫外線処理工程に返送して生物処理工程で有機溶媒
を分解除去し、オゾン・紫外線処理工程で有機溶媒に含
まれたダイオキシン類を分解除去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。(57) [Claims] [Claim 1] Decompose and remove BOD and TN in wastewater
Biological treatment process and ozone for decomposing and removing organic chlorine compounds
-Mix the sludge containing dioxins generated in the ultraviolet treatment step and the biological treatment step with an organic solvent, and irradiate the sludge mixture with ultrasonic waves to convert dioxins in the sludge into the organic solvent. An ultrasonic extraction step of extracting the sludge, a sludge concentration step of separating an organic solvent from the sludge mixture after the extraction step, and collecting sludge from which dioxins have been removed, and a sludge concentration step.
Sludge washing / concentration to wash and concentrate sludge collected in the process
Performs a process, the organic solvent separated in the sludge concentration step is subjected to re-use and return to the ultrasonic extraction step, sludge wash-dark
The concentrated separated liquid separated in the condensing step is
And returned to the UV treatment process to remove the organic solvent in the biological treatment process.
Is decomposed and removed, and contained in organic solvents in the ozone / UV treatment process.
A method for removing dioxins in sludge , comprising decomposing and removing dioxins contained in the sludge.
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 JPH11309497A (en) | 1999-11-09 |
| JP3444782B2 true 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 |
|---|---|
| JPH11309497A (en) | 1999-11-09 |
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