JP3685373B2 - Dechlorination and decomposition process by-product processing method - Google Patents

Dechlorination and decomposition process by-product processing method Download PDF

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JP3685373B2
JP3685373B2 JP28984999A JP28984999A JP3685373B2 JP 3685373 B2 JP3685373 B2 JP 3685373B2 JP 28984999 A JP28984999 A JP 28984999A JP 28984999 A JP28984999 A JP 28984999A JP 3685373 B2 JP3685373 B2 JP 3685373B2
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oil
dechlorination
product
salts
pcbs
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JP2001104912A (en
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隆治 内田
一憲 加納
圭彦 井上
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Ebara Corp
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Ebara Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、脱塩素化分解プロセス副生成物の処理方法に関し、更に詳しくは、ポリ塩化ビフェニール(以下、「PCB」と言う)類含有物を脱塩素化分解する際に生じる副生成物を、効果的に処分する脱塩素化分解プロセス副生成物の処理方法に関する。
【0002】
【従来の技術】
PCB類はかって有用な物質として熱媒体、トランス・コンデンサ等の電気機器用の絶縁油、ノーカーボン紙の他、潤滑油、各種可塑剤、塗科、シーラント剤等に生産・使用されていた。PCB類とは、PCBとその誘導体を含む概念である。PCB類は、カネミ油症事件等をきっかけに生体・環境への影響が明らかになり、昭和47年までに生産が中止され、昭和49年度までに製造・輸入、開放系用途での使用、新規使用が禁じられた。閉鎖系用途については、その後熱媒体用のPCB類は大部分が回収されたが、電気機器用のPCB類は現在も継続して使用されているか、使用事業者で保管されている。
しかし、使用済PCB類について、電気機器等の保管が長期化する中、機器の紛失・行方不明、PCB類の漏出、事故による漏洩等の恐れが大きくなってきている。既に、平成5年の厚生省の調査によれば、約7%が行方不明になっている。PCB類は環境中あるいは生体中で広く検出され、種々の経路を通って環境中に侵入している可能性が示唆されている。
PCB類に関するリスクとして世界的に最も懸念されているものの一つが、使用中及び保管中の火災に伴うPCB類の飛散や、そのダイオキシン類等の燃焼副生成物の生成と飛散である。国際的には処理を早急に進めるべきであるとの認識があり、EUでは2010年までに、北海条約署名国では、更に早い1999年末までの処分が求められている。
【0003】
しかし日本では、1987年の高温熱分解処理を唯一の例外として、「PCB廃棄物の処理」が認められた例はなく、全国各地で多数計画された他の処理施設は、立地の問題で実現していない。廃PCB等の処理方法として、従来高温焼却のみが国によって規定されていたが、その後の新たな規定、告示などにより「脱塩素化分解法」と「超臨界水酸化法」が定められた。
また、PCB関連廃棄物の判定基準として処理済の廃油については、EU等やバーゼル条約国内法の基準である50ppmよりも厳しいその1/100に当たる0.5ppm(mg‐PCB/Kg)が定められた。
廃PCB等としては、もともと使用されていた濃度数十%〜100%の高濃度PCB類と、本来PCBを含まないはずの油が何らかの原因でPCBで汚染された低濃度PCB類汚染油がある。また低濃度PCB類汚染油の多くは50ppm以下とされている。
PCB類の脱塩素化分解法は、PCB類を含む油にアルカリ等の薬剤を添加して反応させる方法である。反応終了後の反応液中には、PCB類中の塩素等と、アルカリとの反応で生成した塩類、および過剰のアルカリ剤等が存在しプロセスによっては水分も含有する。
処理済み油を再利用するためにはこれらの塩類や水分を除去することが望ましい。
【0004】
【発明が解決しようとする課題】
塩類等の除去方法として水洗浄があるが、塩類だけでなく高濃度の有機物質も含む廃水が大量に発生する。処理工程に水添加を含むようなプロセスでも同様の廃水が生成する。この廃水を放流する場合には、中和凝集沈殿、生物処理、吸着等の多種の水処理プロセスが必要になる。また、産業廃棄物(廃アルカリ)として処分するには、廃水の量が多い。
塩類を物理的に分離した場合には、油分を多く含むスラリー状の含油塩類となり、処理済油が随伴されるため、廃棄物の発生量が多くなる。
そこで本発明は、PCB類の脱塩素化分解法において、廃水処理が不要で廃水放流がほとんど無く、含油塩類を減容化して産廃処分量を低減できる、副生成物の処理方法を提供することを目的とする。
【0005】
【課題を解決するための手段】
本発明は、上記の課題を以下の手段で解決した。
(1)PCB類を含む廃棄物若しくは汚染物の脱塩素化分解処理工程又は汚染物の洗浄工程で生成する副生塩類を分離し、溶媒が付着した状態の該副生塩類から該溶媒を揮発除去することを特徴とする脱塩素化分解プロセス副生成物の処理方法。
(2)前記副生塩類は、脱塩素化分解処理工程後若しくは汚染物の洗浄工程後の中和工程の際に得られたものであることを特徴とする上記(1)に記載の脱塩素化分解プロセス副生成物の処理方法。
(3)前記溶媒を加熱により揮発除去することを特徴とする上記(1)又は(2)に記載の脱塩素化分解プロセス副生成物の処理方法。
上記の発明は、例えば溶媒がトランス油のような油分であれば、回収して再生利用できるようになる。
回収した油は加熱用に使用できる。特に焼却炉で加熱する場合には内燃用あるいは外熱用何れの燃料に用いてもよい。
本発明は、副生成水中の塩類だけでなく、脱塩素分解工程の前後の処理としての洗浄液中の塩類や、上記廃水等の中にイオン化している酸やアルカリを中和して発生したものをも対象とする。
加熱による濃縮、乾固、消却、溶融などの処理の外、溶媒の蒸発気化が促進できるものであれば、減圧、真空乾燥その他公知の技術が何れも適用できる。
非揮発物中には塩以外にTOC、COD物質のような有機物も含まれており、これらも濃縮固化して廃棄又は再溶存化分離するなどして再利用することが可能である。
【0006】
【発明の実施の形態】
PCB類のような有機塩素化合物の脱塩素化分解は、一般に有機塩素化合物を含む油中にアルカリ等の薬剤を添加混合して加熱し、有機塩素化合物中の塩素を脱塩素させるものである。通常、処理可能な油中の有機塩素化合物濃度には上限があり、必要に応じてトランス油等で希釈した油を処理している。
反応の結果生成する処理済油には、通常、生成塩類および過剰のアルカリ剤が含まれる。また金属アルカリ等の反応性の高い薬剤を使用する場合には、過剰の薬剤を消費させて反応を終了させるために添加した水も、処理済油に含まれる。
【0007】
図1は、本発明の実施の形態を実施する装置の一例を示す概念図である。
含油塩類貯留・供給装置1が設けられ、そこから加熱乾燥装置2に供給路が通じている。加熱乾燥装置2には、窒素ガスを生成する窒素供給装置3から窒素供給管が延びてきている。
加熱乾燥装置2からは凝縮器4に気液管が延び、凝縮器4からは凝縮液管が凝縮油受槽5に至っている。さらに、凝縮器4からは気送管が燃焼炉6に通じている。
燃焼炉6は助燃バーナー7を有し、また、燃焼炉6近傍にはアルカリ液を中和する中和装置8が設けられ、廃水・洗浄廃水を貯留する廃水・洗浄廃水槽9に向けて通じている。廃水・洗浄廃水槽9からは廃水管が延び、助燃バーナー7の火炎吹き出し口付近で廃水管の吹き出し口が開口している。燃焼炉6の排ガス管は、排ガス処理設備10に通じると共に、その助燃バーナー7には燃料槽11から油送管が延びてきている。
本発明の実施の形態では、例えば次のように脱塩素化プロセス副生成物を処理する。すなわち、脱塩素処理反応で副生成される塩類を油分が付着した含油塩類の状態で物理的に分離する。具体的には、例えば沈降分離、遠心分離、濾過などの方法がある。
沈降分離などで分離した含油塩類は、相当量の処理済油を随伴して湿潤している。
表1に脱塩素化分解により生じた含油塩類の一般的な性状の一例を示す。なお、数値は分離操作の違いで割合は大きく変動する。
【0008】
【表1】

Figure 0003685373
【0009】
こうした含油塩類は、いったん含油塩類貯留・供給装置1に供給し、含油塩類貯留・供給装置1から加熱乾燥装置2に供給し、窒素ガス雰囲気中、油分の沸点以上で加熱乾燥して油分を蒸発させる。
加熱乾燥装置2は、加熱乾燥対象の含油塩類に熱を供給し、含油塩類の油分を蒸発できる装置であれば良い。ただし、その方式は、空気との接触を避けることができる間接加熱が好ましい。蒸発方式としては、通気乾燥、外熱方式、真空乾燥、湿式乾燥などを挙げることができる。そのような乾燥装置としては、バンド型乾燥装置、ロータリキルン、ドラム乾燥装置、流動層乾燥装置等を挙げることができる。加熱乾燥装置2は、例えば外熱式のロータリキルンなどを用いれば、連続処理が可能になって好ましい。運転条件は、被加熱物の温度が油分の沸点以上であればよいので、雰囲気温度を350℃以上とする。このとき、窒素雰囲気で処理するのが望ましい。
【0010】
含油塩類貯留・供給装置1から、加熱乾燥装置2に含油塩類を供給し、バッチ式、または連続的に油分を加熱蒸発させる。加熱乾燥装置2内部を窒素ガス雰囲気に保つため、窒素供給設備3により窒素ガスを必要量供給することが望ましい。
加熱乾燥装置2から出る排ガスは、凝縮器4に通し、これによって蒸発した油分を凝縮させ回収する。排ガスはさらに燃焼炉6に導き、必要に応じて助燃バーナ7で燃焼させる。
蒸発油を含むガスを直接燃焼することもできる。その場合、凝縮器4を省略し、直接燃焼炉6に導入する。
燃焼ガスの排ガス処理設備11は、ガスを冷却する装置、煤塵除去装置あるいはガス冷却・煤塵除去を兼ねる装置、NOx、ダイオキシン類除去装置などを必要に応じて組み合わせて足る。
高濃度にBOD、CODを含む廃水は、蒸発油を燃焼させる燃焼炉で処理が可能である。バーナの燃焼空気中、あるいは、バーナ火炎に噴霧する。
【0011】
アルカリを多量に含む洗浄廃水は、中和装置8で中和後、燃焼炉6で焼却処理する。
湿式洗浄等を用いた場合には廃水が生じるが、有機物は分解されているため、排ガス処理にpH調整等の簡単な処理だけで放流基準を満たす。排ガス処理をバグフィルタ等の乾式で行なえば、排ガス処理装置11から廃水が出ないようにすることもできる。
この実施の形態では、含油塩類のうち回収された油分は処理済油として再利用したり、脱塩素化分解プロセスで再利用したり、燃焼炉6で熱源として利用する。これによって産廃として処理する量を低減することができる。
排ガス処理のための燃焼炉で有機物を多く含む廃水を焼却処理する。廃水処理工程を省略できるようになる。
これらの組み合わせにより、燃焼ガスの処理方式によっては、無排水設備とすることが可能である。
上記の例では燃焼炉6と助燃バーナー7を用いている。これに代えて減圧機を用いれば、加熱によらず溶媒を揮発除去できる。
【0012】
【実施例】
〔実施例1〕
PCBの脱塩素化分解処理で生じた含油塩類を加熱した。加熱器は、電気ヒータによる外熱キルンを用いた。
処理対象:
含油塩類〔油分 50wt%,塩類 50wt%(KCl,KOH)〕
嵩比重 :1000 [kg/m3
処理量 :10 [kg/h]
焼成条件:雰囲気温度400,500,600℃
滞留時間:60分
結果を塩類加熱試験ラボデータとして以下に示す。
【0013】
【表2】
Figure 0003685373
【0014】
【発明の効果】
本発明は上記のような構成でなるから、処分量が減少し、産廃処分費の低減化が可能で、油分の効果的な回収もでき、含油塩類を減容化し、排水放流もほとんどない脱塩素化分解プロセスを提供することができる。
【図面の簡単な説明】
【図1】本発明の実施の形態を実施する装置の一例を示す概念図である。
【符号の説明】
1 含油塩類貯留・供給装置
2 加熱乾燥装置
3 窒素供給装置
4 凝縮器
5 凝縮油受槽
6 燃焼炉
7 助燃バーナー
8 中和装置
9 廃水・洗浄廃水槽
10 排ガス処理設備
11 燃料槽[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating a dechlorination / cracking process by-product, and more specifically, a by-product generated when dechlorinating and decomposing a polychlorinated biphenyl (hereinafter referred to as “PCB”)-containing material. The present invention relates to a method for treating a by-product of a dechlorination decomposition process that is effectively disposed of.
[0002]
[Prior art]
PCBs have been produced and used as useful materials for heat transfer media, insulating oils for electrical equipment such as transformers and capacitors, carbonless paper, as well as lubricating oils, various plasticizers, coatings, sealant agents, and the like. PCBs are a concept including PCB and its derivatives. PCBs were affected by living things and the environment after the Kanemi oil affairs incident, etc., and production was discontinued by 1972. Manufacturing, importing, use for open systems, and new use by 1979 Forbidden. For closed-system applications, most of the PCBs for heat transfer media have been recovered since then, but PCBs for electrical equipment are still being used or stored by operators.
However, with regard to the used PCBs, while the storage of electrical equipment and the like has been prolonged, there is a greater risk of equipment loss / missing, leakage of PCBs, leakage due to accidents, and the like. Already, according to a survey by the Ministry of Health and Welfare in 1993, about 7% are missing. PCBs are widely detected in the environment or in the living body, and it is suggested that they may enter the environment through various routes.
One of the world's most concerned risks regarding PCBs is the scattering of PCBs associated with fires during use and storage, and the generation and scattering of combustion by-products such as dioxins. Internationally, there is a perception that processing should proceed as soon as possible, and EU is required to dispose of it by 2010, and the North Sea Treaty signing country is required to dispose of it earlier by the end of 1999.
[0003]
However, in Japan, with the exception of high-temperature pyrolysis treatment in 1987, there is no example of “PCB waste treatment” approved, and many other treatment facilities planned throughout the country are realized due to location problems. Not done. Conventionally, only high-temperature incineration has been prescribed by the government as a treatment method for waste PCBs, but “dechlorination decomposition method” and “supercritical water oxidation method” have been established by new regulations and notifications thereafter.
In addition, as a criterion for determining PCB-related waste, 0.5ppm (mg-PCB / Kg), which is 1/100 of the stricter than 50ppm, which is the standard of the EU and the Basel Convention, is established for waste oil that has been treated. It was.
Waste PCBs include high-concentration PCBs with a concentration of several tens to 100% that were originally used, and low-concentration PCB-contaminated oils that are contaminated with PCBs for some reason because they should not contain PCBs. . Most of low-concentration PCBs contaminated oil is 50 ppm or less.
The dechlorination / decomposition method for PCBs is a method in which a chemical such as an alkali is added to an oil containing PCBs and reacted. In the reaction solution after completion of the reaction, chlorine and the like in PCBs and salts generated by the reaction with alkali, excess alkali agent and the like are present, and depending on the process, water is also contained.
It is desirable to remove these salts and moisture in order to reuse the treated oil.
[0004]
[Problems to be solved by the invention]
There is water washing as a method for removing salts and the like, but a large amount of waste water containing not only salts but also high-concentration organic substances is generated. Similar wastewater is produced in processes that include water addition in the process. In the case of discharging this wastewater, various water treatment processes such as neutralization coagulation sedimentation, biological treatment, and adsorption are required. Moreover, in order to dispose as industrial waste (waste alkali), the amount of waste water is large.
When the salts are physically separated, they become slurry-like oil-containing salts containing a large amount of oil, and treated oil is accompanied, resulting in an increase in the amount of waste generated.
Accordingly, the present invention provides a by-product processing method that does not require waste water treatment and has almost no waste water discharge in the dechlorination and decomposition method of PCBs, and can reduce the volume of industrial waste by reducing the volume of oil-containing salts. With the goal.
[0005]
[Means for Solving the Problems]
The present invention has solved the above problems by the following means.
(1) Separating by-product salts generated in the dechlorination / decomposition process of wastes or contaminants containing PCBs or the cleaning process of contaminants, and volatilizing the solvent from the by-product salts with the solvent attached A method for treating a by-product of a dechlorination / cracking process, characterized by being removed.
(2) The dechlorination according to (1) above, wherein the by-product salt is obtained in a neutralization step after a dechlorination / decomposition treatment step or a contaminant washing step. Treatment method for chemical decomposition process by-products.
(3) The method for treating a by-product of a dechlorination / decomposition process according to the above (1) or (2), wherein the solvent is volatilized and removed by heating.
In the above invention, for example, if the solvent is an oil such as trans oil, it can be recovered and recycled.
The recovered oil can be used for heating. In particular, when heating in an incinerator, the fuel may be used for either internal combustion or external heat.
The present invention is generated by neutralizing not only the salts in the by-product water but also the salts in the cleaning liquid as a treatment before and after the dechlorination decomposition process, and the acid and alkali ionized in the waste water. Also targeted.
As long as the evaporation and evaporation of the solvent can be promoted in addition to the concentration, drying, extinguishing, melting and the like by heating, any known techniques such as reduced pressure, vacuum drying and the like can be applied.
The non-volatile substances include organic substances such as TOC and COD substances in addition to the salts, and these can also be reused by concentrating and solidifying them for disposal or re-dissolved separation.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the dechlorination and decomposition of organic chlorine compounds such as PCBs, a chemical such as an alkali is generally added to an oil containing an organic chlorine compound and heated to dechlorinate the chlorine in the organic chlorine compound. Usually, there is an upper limit to the concentration of organochlorine compounds in oil that can be treated, and oil diluted with trans oil or the like is treated as necessary.
The treated oil produced as a result of the reaction usually contains product salts and excess alkalinity agent. In addition, when a highly reactive chemical such as a metal alkali is used, water added to consume the excess chemical and terminate the reaction is also included in the treated oil.
[0007]
FIG. 1 is a conceptual diagram showing an example of an apparatus for carrying out an embodiment of the present invention.
An oil-containing salt storage / supply device 1 is provided, and a supply path leads to the heating and drying device 2 therefrom. In the heating and drying apparatus 2, a nitrogen supply pipe extends from a nitrogen supply apparatus 3 that generates nitrogen gas.
A gas / liquid pipe extends from the heating / drying apparatus 2 to the condenser 4, and the condenser liquid pipe reaches the condensed oil receiving tank 5 from the condenser 4. Further, an air pipe is connected from the condenser 4 to the combustion furnace 6.
The combustion furnace 6 has an auxiliary combustion burner 7, and a neutralization device 8 for neutralizing the alkaline liquid is provided in the vicinity of the combustion furnace 6, leading to a wastewater / washing wastewater tank 9 for storing wastewater / washing wastewater. ing. A waste water pipe extends from the waste water / washing waste water tank 9, and a waste water pipe outlet is opened near the flame outlet of the auxiliary burner 7. The exhaust gas pipe of the combustion furnace 6 leads to the exhaust gas treatment facility 10, and an oil feed pipe extends from the fuel tank 11 to the auxiliary burner 7.
In the embodiment of the present invention, for example, the dechlorination process by-product is treated as follows. That is, the salts produced as a by-product in the dechlorination treatment reaction are physically separated in the state of oil-containing salts with attached oil. Specifically, there are methods such as sedimentation separation, centrifugation, and filtration.
Oil-containing salts separated by sedimentation or the like are wet with a considerable amount of treated oil.
Table 1 shows an example of general properties of oil-containing salts produced by dechlorination and decomposition. Note that the numerical value varies greatly depending on the separation operation.
[0008]
[Table 1]
Figure 0003685373
[0009]
These oil-containing salts are once supplied to the oil-containing salt storage / supply device 1, supplied from the oil-containing salt storage / supply device 1 to the heating / drying device 2, and heated and dried at a temperature equal to or higher than the boiling point of the oil in a nitrogen gas atmosphere to evaporate the oil. Let
The heat drying apparatus 2 may be any apparatus that can supply heat to the oil-containing salt to be heat-dried and evaporate the oil content of the oil-containing salt. However, the method is preferably indirect heating that can avoid contact with air. Examples of the evaporation method include aeration drying, an external heating method, vacuum drying, and wet drying. Examples of such a drying device include a band-type drying device, a rotary kiln, a drum drying device, and a fluidized bed drying device. For example, an external heating type rotary kiln or the like can be used as the heating / drying apparatus 2 because continuous processing is possible. The operating condition is that the temperature of the object to be heated should be equal to or higher than the boiling point of the oil component, so the ambient temperature is set to 350 ° C. or higher. At this time, it is desirable to perform the treatment in a nitrogen atmosphere.
[0010]
The oil-containing salts are supplied from the oil-containing salt storage / supply device 1 to the heat drying device 2, and the oil is heated and evaporated batchwise or continuously. In order to keep the inside of the heating and drying apparatus 2 in a nitrogen gas atmosphere, it is desirable to supply a necessary amount of nitrogen gas by the nitrogen supply facility 3.
The exhaust gas emitted from the heating / drying apparatus 2 is passed through the condenser 4 to condense and recover the evaporated oil. The exhaust gas is further guided to the combustion furnace 6 and combusted by the auxiliary burner 7 as necessary.
It is also possible to directly burn a gas containing evaporated oil. In that case, the condenser 4 is omitted and directly introduced into the combustion furnace 6.
The exhaust gas treatment facility 11 for the combustion gas may be a combination of a gas cooling device, a dust removal device, a device that also serves as gas cooling / dust removal, a NOx, dioxin removal device, or the like as necessary.
Wastewater containing BOD and COD at a high concentration can be treated in a combustion furnace that burns evaporated oil. Spray into burner combustion air or burner flame.
[0011]
Washing wastewater containing a large amount of alkali is neutralized by the neutralizer 8 and then incinerated in the combustion furnace 6.
When wet cleaning or the like is used, waste water is generated, but the organic matter is decomposed. Therefore, the exhaust gas treatment satisfies the discharge standard only by simple treatment such as pH adjustment. If the exhaust gas treatment is performed by a dry method such as a bag filter, waste water can be prevented from being discharged from the exhaust gas treatment device 11.
In this embodiment, the recovered oil component of the oil-containing salt is reused as a treated oil, reused in a dechlorination cracking process, or used as a heat source in the combustion furnace 6. Thereby, the amount processed as industrial waste can be reduced.
Incinerate wastewater containing a lot of organic matter in a combustion furnace for exhaust gas treatment. The wastewater treatment process can be omitted.
By combining these, depending on the combustion gas processing method, it is possible to provide a non-drainage facility.
In the above example, the combustion furnace 6 and the auxiliary burner 7 are used. If a decompressor is used instead, the solvent can be volatilized and removed without being heated.
[0012]
【Example】
[Example 1]
The oil-containing salts produced by the dechlorination decomposition treatment of PCB were heated. As the heater, an external heat kiln using an electric heater was used.
Processing object:
Oil-containing salts [oil 50 wt%, salts 50 wt% (KCl, KOH)]
Bulk specific gravity: 1000 [kg / m 3 ]
Processing amount: 10 [kg / h]
Firing conditions: ambient temperature 400, 500, 600 ° C
Residence time: 60 minutes The results are shown below as salt heating test laboratory data.
[0013]
[Table 2]
Figure 0003685373
[0014]
【The invention's effect】
Since the present invention is configured as described above, the amount of disposal can be reduced, the cost of industrial waste disposal can be reduced, the oil can be recovered effectively, the oil-containing salts can be reduced in volume, and the drainage can be discharged little. A chlorinolysis process can be provided.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing an example of an apparatus for carrying out an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Oil-containing salt storage and supply apparatus 2 Heating and drying apparatus 3 Nitrogen supply apparatus 4 Condenser 5 Condensed oil receiving tank 6 Combustion furnace 7 Auxiliary burner 8 Neutralizing apparatus 9 Waste water / washing waste water tank 10 Exhaust gas treatment equipment 11 Fuel tank

Claims (3)

ポリ塩化ビフェニール類を含む廃棄物若しくは汚染物の脱塩素化分解処理工程又は汚染物の洗浄工程で生成する副生塩類を分離し、溶媒が付着した状態の該副生塩類から該溶媒を揮発除去することを特徴とする脱塩素化分解プロセス副生成物の処理方法。Separation of by-product salts generated in the dechlorination / decomposition process of waste or contaminants containing polychlorinated biphenyls or the cleaning process of contaminants, and volatilization of the solvent from the by-product salts with the solvent attached A method for treating a dechlorination and decomposition process by-product. 前記副生塩類は、脱塩素化分解処理工程後若しくは汚染物の洗浄工程後の中和工程の際に得られたものであることを特徴とする請求項1記載の脱塩素化分解プロセス副生成物の処理方法。The by-product of the dechlorination / decomposition process according to claim 1, wherein the by-product salts are obtained after the dechlorination / decomposition treatment step or the neutralization step after the contaminant washing step. How to handle things. 前記溶媒を加熱により揮発除去することを特徴とする請求項1又は2に記載の脱塩素化分解プロセス副生成物の処理方法。3. The method for treating a dechlorination / cracking process by-product according to claim 1, wherein the solvent is volatilized and removed by heating.
JP28984999A 1999-10-12 1999-10-12 Dechlorination and decomposition process by-product processing method Expired - Fee Related JP3685373B2 (en)

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