JP6409589B2 - Water treatment equipment - Google Patents
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本発明は、有機物質を含有する被処理水から有機物質を除去することで当該水を清浄化する水処理装置に関し、特に、各種工場や研究施設等から排出される産業排水、最終処分場から排出される浸出水、地下水等から有機物質を効率的に除去することで当該水を清浄化する水処理装置に関する。 The present invention relates to a water treatment apparatus that purifies the water by removing the organic substance from the water to be treated containing the organic substance, and in particular, from industrial wastewater discharged from various factories and research facilities, from a final disposal site. The present invention relates to a water treatment apparatus that purifies water by efficiently removing organic substances from discharged leachate, groundwater, and the like.
従来より、吸着材を用いて吸着による有機物質の除去（吸着工程）と吸着材の再生（脱着工程）を交互に行うことで、水中から有機物質を高効率で安定的に除去できる水処理装置が知られている。（例えば、特許文献１）。この水処理装置は、水の連続浄化を実現し、基本的には吸着材の交換が必要なく、有機物質を高効率で安定的に除去することができる。 Conventionally, a water treatment device that can remove organic substances from water efficiently and stably by alternately removing organic substances by adsorption (adsorption process) and regenerating adsorbents (desorption process) using adsorbents. It has been known. (For example, patent document 1). This water treatment apparatus realizes continuous purification of water, basically does not require replacement of the adsorbent, and can stably remove organic substances with high efficiency.
前記水処理装置は、吸着材の充填された処理槽へ被処理水を供給することで吸着材と被処理水を接触させて、被処理水中の有機物質を吸着除去させるが、一部の被処理水は吸着材と接触せずに処理水へリークすることがある。そのため、高効率に有機物質を除去する際には、必要量以上の吸着材を充填する必要があったり、複数の水処理装置にて多段吸着処理する必要がある等の課題があった。 The water treatment device supplies treated water to a treatment tank filled with an adsorbent to bring the adsorbent and the treated water into contact with each other to adsorb and remove organic substances in the treated water. The treated water may leak into the treated water without contacting the adsorbent. For this reason, when organic substances are removed with high efficiency, there are problems such as the necessity of filling more than the necessary amount of adsorbent and the necessity of performing multistage adsorption treatment with a plurality of water treatment devices.
本発明は、上記従来技術の改良を背景になされたもので、有機物質を含む水処理において、少ない吸着材充填量で、低コストに、高効率かつ安定的に有機物質を除去する水処理装置を提供することを課題とするものである。 The present invention has been made against the background of the above-described improvement of the prior art, and is a water treatment apparatus that efficiently and stably removes an organic substance at low cost with a small amount of adsorbent filling in water treatment containing an organic substance. It is a problem to provide.
本発明者らは、上記課題を解決するため、鋭意検討した結果、ついに本発明を完成するに到った。すなわち、本発明は、以下の通りである。
（１）吸着素子が収容された処理槽を少なくとも２槽以上有する水処理装置であって、
前記処理槽が、吸着素子に有機物質を含有する被処理水を接触させることで有機物質を吸着除去して処理水を排出する吸着槽、前記吸着槽から排出された処理水を接触させることで有機物質を吸着除去して第２処理水を排出する追吸着槽、および加熱ガスを該吸着素子に接触させることで吸着した有機物質を該吸着素子から脱着させる脱着槽、として繰返し機能し、
前記吸着槽として機能する処理槽と追吸着槽として機能する処理槽が、この順番で直列に通液される流路構成をとり、
前記吸着槽として機能した処理槽は、前記脱着槽として機能する処理槽に移行され、
最上流に配される前記追吸着槽として機能した処理槽は、前記吸着槽として機能する処理槽に移行する、
ことを特徴とする水処理装置。
（２）前記脱着槽として機能した処理槽に内蔵された吸着素子に付着した余剰の水を除去して除去水として排出する工程を有する（１）に記載の水処理装置。
（３）前記除去水が、被処理水へ返送されるように構成された（２）に記載の水処理装置。
（４）前記吸着素子が、活性炭、活性炭素繊維およびゼオライトからなる群から選ばれる少なくとも１の部材を含んでいる（１）〜（３）のいずれかに記載の水処理装置。
As a result of intensive studies in order to solve the above problems, the present inventors have finally completed the present invention. That is, the present invention is as follows.
(1) A water treatment apparatus having at least two treatment tanks containing adsorption elements,
The treatment tank is brought into contact with water to be treated containing organic substances by adsorbing and removing the organic substances by adsorbing and removing the treated water, and by contacting the treated water discharged from the adsorption tank. It functions repeatedly as an additional adsorption tank for adsorbing and removing the organic substance and discharging the second treated water, and a desorption tank for desorbing the organic substance adsorbed by bringing the heated gas into contact with the adsorption element,
The treatment tank functioning as the adsorption tank and the treatment tank functioning as the additional adsorption tank take a flow path configuration in which liquid is passed in series in this order,
The treatment tank functioning as the adsorption tank is transferred to the treatment tank functioning as the desorption tank,
The treatment tank functioning as the additional adsorption tank arranged in the most upstream is shifted to the treatment tank functioning as the adsorption tank.
The water treatment apparatus characterized by the above-mentioned.
(2) The water treatment apparatus according to (1), which includes a step of removing excess water attached to an adsorption element built in the treatment tank functioning as the desorption tank and discharging it as removed water.
(3) The water treatment apparatus according to (2), wherein the removed water is returned to the water to be treated.
(4) The water treatment apparatus according to any one of (1) to (3), wherein the adsorption element includes at least one member selected from the group consisting of activated carbon, activated carbon fiber, and zeolite.
本発明による水処理装置は、基本的に吸着素子の交換の必要が無く、被処理水中の有機物質を高い効率で連続的に除去するとともに、従来の水処理装置と比べて少ない吸着素子充填量で、低コストに水処理ができる利点がある。 The water treatment apparatus according to the present invention basically eliminates the need for replacement of the adsorbing elements, continuously removes organic substances in the water to be treated with high efficiency, and has a smaller adsorbing element filling amount than the conventional water treatment apparatus. Therefore, there is an advantage that water treatment can be performed at low cost.
以下、本発明の実施の形態について、図を参照して詳細に説明する。なお、以下に示す図の実施の形態においては、同一または対応する部分については、適宜省略し、その説明についても繰り返さないことにする。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments shown in the drawings, the same or corresponding parts are omitted as appropriate, and the description thereof will not be repeated.
図２は、本発明の実施形態における水処理装置のシステム構成図の１つである。 FIG. 2 is one of the system block diagrams of the water treatment apparatus in the embodiment of the present invention.
水処理装置は、吸着素子としての吸着材１１１、１２１および１３１がそれぞれ収容された第１処理槽１１０、第２処理槽１２０および第３処理槽１３０を有している。吸着材１１１、１２１および１３１は、被処理水を接触させることで被処理水に含有される有機物質を吸着する。したがって、水処理装置においては、吸着材１１１、１２１および１３１に被処理水を供給することで有機物質が吸着材１１１、１２１および１３１によって吸着され、これにより被処理水が清浄化されて処理水として排出されることになる。また、吸着材１１１、１２１および１３１は、水蒸気を接触させることで吸着した有機物質が脱着される。第１処理槽１１０、第２処理槽１２０および第３処理槽１３０から排出される水蒸気と脱着された有機物質を含むガスは、脱着ガスとして水処理装置外へ排出される。 The water treatment apparatus includes a first treatment tank 110, a second treatment tank 120, and a third treatment tank 130 in which adsorbents 111, 121, and 131 serving as adsorption elements are accommodated, respectively. The adsorbents 111, 121, and 131 adsorb organic substances contained in the water to be treated by bringing the water to be treated into contact therewith. Therefore, in the water treatment apparatus, by supplying the water to be treated to the adsorbents 111, 121 and 131, the organic substance is adsorbed by the adsorbents 111, 121 and 131, thereby cleaning the water to be treated and treating the water. Will be discharged as. In addition, the adsorbents 111, 121, and 131 are desorbed organic substances adsorbed by contacting water vapor. The gas discharged from the first treatment tank 110, the second treatment tank 120, and the third treatment tank 130 and the gas containing the desorbed organic substance are discharged out of the water treatment apparatus as a desorption gas.
第１処理槽１１０、第２処理槽１２０および第３処理槽１３０には、被処理水の供給ライン、処理水の排出ライン、水蒸気の供給ライン、脱着ガスの排出ラインの配管が接続されており、各ラインにはバルブ等を用いて各処理槽に対して接続／非接続状態に切替えられる流路切替手段が接続された構成となっている。第１処理槽１１０、第２処理槽１２０および第３処理槽は、上述したバルブの開閉を操作することによって、順番に吸着槽、追吸着槽および脱着槽として機能する。
第１処理槽１１０が吸着槽として機能している場合には、第２処理槽１２０は追吸着槽として機能し、第３処理槽１３０は脱着槽として機能する。具体的には、被処理水が第１処理槽１１０へ供給された後、次いで第２処理槽１２０へ供給され、第２処理槽から清浄化された第２処理水が装置外へ排出されるように流路が確保される。その時、第３処理槽１３０には水蒸気が供給され、脱着ガスが第３処理槽１３０から排出される流路構成となる。
また、第２処理槽１２０が吸着槽として機能している場合には、第３処理槽１３０は追吸着槽として機能し、第１処理槽１１０は脱着槽として機能する。具体的には、被処理水が第２処理槽１２０へ供給された後、次いで第３処理槽１３０へ供給され、第３処理槽から清浄化された第２処理水が装置外へ排出されるように流路が確保される。その時、第１処理槽１１０には水蒸気が供給され、脱着ガスが第１処理槽１１０から排出される流路構成となる。
本実施の形態における水処理装置においては、吸着槽と追吸着槽と脱着槽とが経時的に切り替わるように構成されている。
The first treatment tank 110, the second treatment tank 120, and the third treatment tank 130 are connected with piping for a treated water supply line, a treated water discharge line, a water vapor supply line, and a desorption gas discharge line. Each line has a configuration in which a flow path switching means that is switched to a connected / disconnected state is connected to each processing tank using a valve or the like. The 1st processing tank 110, the 2nd processing tank 120, and the 3rd processing tank function as an adsorption tank, an additional adsorption tank, and a desorption tank in order by operating opening and closing of the valve mentioned above.
When the 1st processing tank 110 is functioning as an adsorption tank, the 2nd processing tank 120 functions as an additional adsorption tank, and the 3rd processing tank 130 functions as a desorption tank. Specifically, after the water to be treated is supplied to the first treatment tank 110, it is then supplied to the second treatment tank 120, and the second treated water cleaned from the second treatment tank is discharged out of the apparatus. Thus, a flow path is secured. At that time, the third treatment tank 130 is supplied with water vapor, and the desorption gas is discharged from the third treatment tank 130.
Moreover, when the 2nd processing tank 120 is functioning as an adsorption tank, the 3rd processing tank 130 functions as an additional adsorption tank, and the 1st processing tank 110 functions as a desorption tank. Specifically, after the water to be treated is supplied to the second treatment tank 120, it is then supplied to the third treatment tank 130, and the second treated water cleaned from the third treatment tank is discharged out of the apparatus. Thus, a flow path is secured. At that time, the first processing tank 110 is supplied with water vapor, and the desorption gas is discharged from the first processing tank 110.
The water treatment apparatus in the present embodiment is configured such that the adsorption tank, the additional adsorption tank, and the desorption tank are switched over time.
図示しないが、水処理装置は追吸着槽から脱着槽に切替わった際に、吸着材１１１、１２１または１３１に付着する水分を脱水除去して除去水として排出してから、脱着を開始する装置の方が好ましい。吸着材１１１、１２１または１３１の付着水を事前に除去してから脱着を行う方が、脱着効率を高めることができる。付着水の除去手段は、自重抜き、圧縮空気・窒素・水蒸気などの高圧ガスでの高速パージ、真空ポンプなどを用いた吸引などの手段が使用できるが、特に限定しない。 Although not shown, when the water treatment apparatus is switched from the additional adsorption tank to the desorption tank, the water adhering to the adsorbent 111, 121, or 131 is dehydrated and removed as discharged water, and then desorption is started. Is preferred. Desorption efficiency can be improved by performing desorption after removing the adhering water of the adsorbent 111, 121 or 131 in advance. The means for removing the adhering water can be, but not limited to, means such as self-weight removal, high-speed purge with a high-pressure gas such as compressed air, nitrogen, and water vapor, and suction using a vacuum pump.
また、前記除去水は被処理水へ返送され、再度処理されるような構成が好ましい。除去水を他の水処理装置で別途処理する必要がなくなる。 Further, it is preferable that the removed water is returned to the treated water and treated again. It is not necessary to separately process the removed water with another water treatment apparatus.
吸着材１１１、１２１および１３１としては、活性炭、活性炭素繊維およびゼオライトからなる群から選ばれる少なくとも１の部材を含むことが好ましい。吸着材１１１、１２１および１３１としては、粒状、粒体状、ハニカム状等の活性炭やゼオライトが利用できるが、活性炭素繊維を利用することがより好ましい。活性炭素繊維は、表面にミクロ孔を有する繊維状構造を有しているため、水との接触効率が高く、特に水中の有機物質の吸着速度が速くなり、他の吸着材に比べて極めて高い吸着効率を実現できる部材である。 The adsorbents 111, 121 and 131 preferably include at least one member selected from the group consisting of activated carbon, activated carbon fiber and zeolite. As the adsorbents 111, 121, and 131, activated carbon or zeolite such as granular, granular, and honeycomb can be used, but it is more preferable to use activated carbon fibers. Since the activated carbon fiber has a fibrous structure with micropores on the surface, the contact efficiency with water is high, and the adsorption rate of organic substances in water is particularly high, which is extremely high compared to other adsorbents. It is a member that can realize adsorption efficiency.
吸着材１１１、１２１および１３１として利用可能な活性炭素繊維としては、特に限定されるものではないが、ＢＥＴ比表面積が７００〜２０００ｍ２／ｇ、全細孔容積が０．４〜０．９ｃｍ３／ｇ、平均細孔径が１７〜１８Åのものが好ましい。これは、ＢＥＴ比表面積が７００ｍ２／ｇ未満、細孔容積が０．４ｍ３／ｇ未満、平均細孔径が１７Å未満のものでは、有機物質の吸着量が低くなる。また、ＢＥＴ比表面積が２０００ｍ２／ｇを超えるもの、全細孔容積が０．９ｍ３／ｇを超えるもの、平均細孔径が１８Åを超えるものでは、細孔径が大きくなるため分子量の小さな物質等の吸着能力が低下したり、強度が弱くなったり、素材のコストが高くなって経済的に不利になったりする。 The activated carbon fiber that can be used as the adsorbents 111, 121, and 131 is not particularly limited, but the BET specific surface area is 700 to 2000 m 2 / g, and the total pore volume is 0.4 to 0.9 cm 3. / G and an average pore diameter of 17 to 18 mm are preferable. When the BET specific surface area is less than 700 m 2 / g, the pore volume is less than 0.4 m 3 / g, and the average pore diameter is less than 17 mm, the adsorption amount of the organic substance is low. In addition, when the BET specific surface area exceeds 2000 m 2 / g, the total pore volume exceeds 0.9 m 3 / g, or the average pore diameter exceeds 18 mm, the substance having a small molecular weight because the pore diameter increases. The adsorbing capacity of the material is reduced, the strength is weakened, and the cost of the material is increased, resulting in an economical disadvantage.
本発明の実施の形態では、脱着媒体は水蒸気を使用したが、蒸気圧、温度等は特に限定しない。また、加熱空気、加熱窒素などでも良く、使用する吸着材の耐熱温度や物性などに応じて適切な加熱ガスを選定すれば良い。 In the embodiment of the present invention, water vapor is used as the desorption medium, but the vapor pressure, temperature and the like are not particularly limited. Moreover, heating air, heating nitrogen, etc. may be sufficient and what is necessary is just to select an appropriate heating gas according to the heat-resistant temperature of the adsorbent used, a physical property, etc.
また、本発明の実施形態として、３つの処理槽を使用して説明したが、図３に示すように、２つの処理槽を用いた装置構成であっても良い。２つの処理槽を用いた装置構成の場合は、例えば、吸着素子として吸着材１１１および１２１がそれぞれ収容された第１処理槽１１０および第２処理槽１２０の２つの処理槽を使用した場合、第１処理槽１１０が吸着槽として機能している場合には、第２処理槽１２０は追吸着槽として機能する。第１処理槽が脱着槽へ切り替わった際、第２処理槽１２０は待機し、被処理水は一時貯水され、吸着除去は一時中断させる。第１処理槽１１０の脱着が完了すると、第２処理槽１２０は吸着槽として機能し、第１処理槽１１０は追吸着槽として機能する。この切り替えサイクルを繰り返す構成でも良い。また、図示しないが、処理槽を４つ以上としても良く、この場合は追吸着槽として機能する処理槽が増え、より排水と吸着材の接触効率が高まる構成となる。 Moreover, although demonstrated using three process tanks as embodiment of this invention, as shown in FIG. 3, the apparatus structure using two process tanks may be sufficient. In the case of an apparatus configuration using two processing tanks, for example, when two processing tanks of the first processing tank 110 and the second processing tank 120 in which the adsorbents 111 and 121 are accommodated as adsorption elements are used, When the 1 processing tank 110 is functioning as an adsorption tank, the 2nd processing tank 120 functions as an additional adsorption tank. When the first treatment tank is switched to the desorption tank, the second treatment tank 120 stands by, the treated water is temporarily stored, and the adsorption removal is temporarily suspended. When the desorption of the first treatment tank 110 is completed, the second treatment tank 120 functions as an adsorption tank, and the first treatment tank 110 functions as a supplementary adsorption tank. A configuration in which this switching cycle is repeated may be used. Although not shown, four or more treatment tanks may be provided. In this case, the number of treatment tanks functioning as additional adsorption tanks is increased, and the contact efficiency between the waste water and the adsorbent is further increased.
また、本発明の実施の形態における水処理装置から排出される脱着ガスの処理方法については特に限定しないが、触媒酸化装置、直接燃焼装置、蓄熱式燃焼装置、または廃液燃焼装置などの燃焼装置、活性汚泥装置などの生物処理、促進酸化装置など化学処理などが挙げられ、脱着媒体や脱着ガス組成に応じて適切な方法を選定すれば良い。 Further, the method for treating the desorption gas discharged from the water treatment apparatus in the embodiment of the present invention is not particularly limited, but a combustion apparatus such as a catalytic oxidation apparatus, a direct combustion apparatus, a heat storage combustion apparatus, or a waste liquid combustion apparatus, Biological treatment such as an activated sludge apparatus, chemical treatment such as an accelerated oxidation apparatus, and the like can be mentioned, and an appropriate method may be selected according to the desorption medium and desorption gas composition.
本発明の被処理水に含まれる有機物質は、特に限定されないが、アセトン、１，４−ジオキサン、２−メチル−１，３−ジオキソラン、１，３−ジオキソラン、テトラヒドロフラン、酢酸メチル、酢酸エチル、酢酸プロピル、酢酸ブチル、エタノール、ｎ−プロピルアルコール、イソプロピルアルコール、酢酸、フェノール、アクリロニトリル、ジクロロメタン、１，２−ジクロロエタン、トリクロロエチレン、Ｎ−メチル−２−ピロリドン、ジメチルアセトアミド、Ｎ，Ｎ−ジメチルホルムアミドなどが挙げられる。 The organic substance contained in the water to be treated of the present invention is not particularly limited, but acetone, 1,4-dioxane, 2-methyl-1,3-dioxolane, 1,3-dioxolane, tetrahydrofuran, methyl acetate, ethyl acetate, Propyl acetate, butyl acetate, ethanol, n-propyl alcohol, isopropyl alcohol, acetic acid, phenol, acrylonitrile, dichloromethane, 1,2-dichloroethane, trichloroethylene, N-methyl-2-pyrrolidone, dimethylacetamide, N, N-dimethylformamide, etc. Is mentioned.
以上の図２および図３を用いて説明した水処理装置の構成にすることにより、有機物質を吸着させる処理槽として、吸着槽と追吸着槽を設けることで、排水のリークを防ぎ、吸着材の吸着性能を有効に活用することができるので、図１に示す従来水処理装置と比較して、少ない吸着材充填量で装置設計でき、充填量が抑えられた分の脱着熱量を削減でき、低コストで水処理が可能となる。 By using the configuration of the water treatment apparatus described with reference to FIGS. 2 and 3 above, by providing an adsorption tank and a supplementary adsorption tank as treatment tanks for adsorbing organic substances, leakage of drainage can be prevented, and the adsorbent Therefore, compared with the conventional water treatment device shown in FIG. 1, the device can be designed with a small amount of adsorbent filling, and the amount of heat of desorption can be reduced as the filling amount is suppressed. Water treatment is possible at low cost.
以上において説明した本発明の実施の形態の特徴的な構成は、相互に組み合わせることが可能である。 The characteristic configurations of the embodiments of the present invention described above can be combined with each other.
また、以上において説明した本発明の実施の形態においては、ポンプやファン等の流体搬送手段やストレージタンク等の流体貯留手段などの構成要素を特に示すことなく説明を行なったが、これら構成要素は必要に応じて適宜の位置に配置すればよい。 Further, in the embodiments of the present invention described above, the description has been made without particularly showing the constituent elements such as the fluid conveying means such as the pump and the fan and the fluid storing means such as the storage tank. What is necessary is just to arrange | position to an appropriate position as needed.
このように、今回開示した上記各実施の形態はすべての点で例示であって、制限的なものではない。本発明の技術的範囲は特許請求の範囲によって画定され、また特許請求の範囲の記載と均等の意味および範囲内でのすべての変更を含むものである。 Thus, the above-described embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
評価は下記の方法によりおこなった。
（ＢＥＴ比表面積）
ＢＥＴ比表面積は、液体窒素の沸点（−１９５．８℃）雰囲気下、相対圧力０．０〜０．１５の範囲で上昇させたときの試料への窒素吸着量を数点測定し、ＢＥＴプロットにより試料単位質量あたりの表面積（ｍ２／ｇ）を求めた。
（有機物質除去効果）
被処理水は１，４−ジオキサン１０００ｍｇ／Ｌを含む水とした。５００時間運転後の水処理装置の入出の１，４−ジオキサン濃度を測定し、除去効果を確認した。
（有機物質濃度評価）
各水およびガスをガスクロマトグラフ法により分析し測定した。
Evaluation was performed by the following method.
(BET specific surface area)
The BET specific surface area was measured by measuring the amount of nitrogen adsorbed on the sample when the relative pressure was raised in the range of 0.0 to 0.15 in the atmosphere of the boiling point of liquid nitrogen (-195.8 ° C), and a BET plot. Was used to determine the surface area (m 2 / g) per unit mass of the sample.
(Organic substance removal effect)
The water to be treated was water containing 1000 mg / L of 1,4-dioxane. The 1,4-dioxane concentration at the entrance and exit of the water treatment apparatus after 500 hours of operation was measured to confirm the removal effect.
(Organic substance concentration evaluation)
Each water and gas was analyzed and measured by gas chromatography.
［参考例１］
システムとしては、図２に示す実施の形態を使用した。
水処理装置に、吸着材としてＢＥＴ比表面積１８５０ｍ２／ｇの活性炭素繊維を重量０．１３ｋｇの吸着素子を充填し（吸着素子合計充填量：０．３９ｋｇ）、１，４−ジオキサン１０００ｍｇ／Ｌを含有する被処理水を９０Ｌ／ｈになるように導入し、処理水を得た。
[ Reference Example 1]
As the system, the embodiment shown in FIG. 2 was used.
In a water treatment device, an activated carbon fiber having a BET specific surface area of 1850 m 2 / g as an adsorbent is filled with an adsorbing element having a weight of 0.13 kg (total adsorbing element filling amount: 0.39 kg), and 1,4-dioxane 1000 mg / L is added. The treated water contained was introduced at 90 L / h to obtain treated water.
次に、１２０℃の水蒸気を吸着材に供給して吸着材の付着水を除去（脱水）した後、除去水は水処理装置の被処理水へ返送した。続いて、１２０℃の水蒸気を吸着材に供給し脱着を実施した。脱着に使用した水蒸気および吸着材から脱着された１，４−ジオキサンは凝縮器にて液化され濃縮水として回収した。脱水および脱着に使用した水蒸気量は、９６０ｇ／ｈであった。吸着時間は２０ｍｉｎとして切替サイクルとした。その際の処理水中の１，４−ジオキサン濃度は、０．００５ｍｇ／Ｌ以下まで除去が可能であった。また、濃縮水は水量７００ｍＬ／ｈであった。 Next, water at 120 ° C. was supplied to the adsorbent to remove (dehydrate) the adhering water on the adsorbent, and the removed water was returned to the water to be treated in the water treatment apparatus. Subsequently, desorption was performed by supplying water vapor at 120 ° C. to the adsorbent. The water vapor used for desorption and 1,4-dioxane desorbed from the adsorbent were liquefied in a condenser and recovered as concentrated water. The amount of water vapor used for dehydration and desorption was 960 g / h. The adsorption time was set to 20 min and a switching cycle was set. The 1,4-dioxane concentration in the treated water at that time could be removed to 0.005 mg / L or less. The concentrated water had a water volume of 700 mL / h.
表１に示すように、本参考例の水処理装置により浄化された水は、５００時間後でも、０．３９ｋｇの吸着素子で、処理水中の１，４−ジオキサン濃度が０．００５ｍｇ／Ｌ以下で処理が可能であった。また、表２に示すように、本参考例にて使用した水蒸気量の合計は９６０ｇ／ｈ、濃縮水量は７００ｍL／ｈであった。 As shown in Table 1, the water purified by the water treatment apparatus of this reference example is a 0.39 kg adsorption element even after 500 hours, and the 1,4-dioxane concentration in the treated water is 0.005 mg / L or less. It was possible to process. Further, as shown in Table 2, the total amount of water vapor used in this reference example was 960 g / h, and the amount of concentrated water was 700 mL / h.
［実施例２］
システムとしては、図３に示す実施の形態を使用した。
水処理装置に、吸着材としてＢＥＴ比表面積１８５０ｍ２／ｇの活性炭素繊維を重量０．１９ｋｇの吸着素子を充填し（吸着素子合計充填量：０．３８ｋｇ）、１，４−ジオキサン１０００ｍｇ／Ｌを含有する被処理水を９０Ｌ／ｈになるように導入し、処理水を得た。
[Example 2]
As the system, the embodiment shown in FIG. 3 was used.
The water treatment apparatus was filled with an adsorption element having a weight of 0.19 kg of activated carbon fiber having a BET specific surface area of 1850 m 2 / g as an adsorbent (total adsorption amount of adsorption element: 0.38 kg), and 1,4-dioxane 1000 mg / L The water to be treated containing was introduced at 90 L / h to obtain treated water.
次に、１２０℃の水蒸気を吸着材に供給して吸着材の付着水を除去（脱水）した後、除去水は水処理装置の被処理水へ返送した。続いて、１２０℃の水蒸気を吸着材に供給し脱着を実施した。脱着に使用した水蒸気および吸着材から脱着された１，４−ジオキサンは凝縮器にて液化され濃縮水として回収した。脱水および脱着に使用した水蒸気量は、９４０ｇ／ｈであった。なお、脱水・脱着工程中は、被処理水を一時貯水し、吸着工程時に供給される被処理水と混合して処理を行った。吸着時間は２０ｍｉｎとして切替サイクルとした。その際の処理水中の１，４−ジオキサン濃度は、０．００５ｍｇ／Ｌ以下まで除去が可能であった。また、濃縮水は水量６８０ｍＬ／ｈであった。 Next, water at 120 ° C. was supplied to the adsorbent to remove (dehydrate) the adhering water on the adsorbent, and the removed water was returned to the water to be treated in the water treatment apparatus. Subsequently, desorption was performed by supplying water vapor at 120 ° C. to the adsorbent. The water vapor used for desorption and 1,4-dioxane desorbed from the adsorbent were liquefied in a condenser and recovered as concentrated water. The amount of water vapor used for dehydration and desorption was 940 g / h. During the dehydration / desorption process, the treated water was temporarily stored and mixed with the treated water supplied during the adsorption process. The adsorption time was set to 20 min and a switching cycle was set. The 1,4-dioxane concentration in the treated water at that time could be removed to 0.005 mg / L or less. The concentrated water had a water amount of 680 mL / h.
表１に示すように、本実施例の水処理装置により浄化された水は、５００時間後でも、０．３８ｋｇの吸着素子で、処理水中の１，４−ジオキサン濃度が０．００５ｍｇ／Ｌ以下で処理が可能であった。また、表２に示すように、本実施例にて使用した水蒸気量の合計は９４０ｇ／ｈ、濃縮水量は６８０ｍＬ／ｈであった。 As shown in Table 1, the water purified by the water treatment apparatus of this example is a 0.38 kg adsorption element even after 500 hours, and the 1,4-dioxane concentration in the treated water is 0.005 mg / L or less. It was possible to process. Further, as shown in Table 2, the total amount of water vapor used in this example was 940 g / h, and the amount of concentrated water was 680 mL / h.
[比較例１]
システムとしては、図１に示す実施の形態を使用した。
水処理装置に、吸着材としてＢＥＴ比表面積１８５０ｍ２／ｇの活性炭素繊維を重量０．２ｋｇの吸着素子を充填し（吸着素子合計充填量：０．４ｋｇ）、１，４−ジオキサン１０００ｍｇ／Ｌを含有する被処理水を９０Ｌ／ｈになるように導入し、処理水を得た。
[Comparative Example 1]
As the system, the embodiment shown in FIG. 1 was used.
The water treatment apparatus was filled with an adsorption element having a weight of 0.2 kg of activated carbon fiber having a BET specific surface area of 1850 m 2 / g as an adsorbent (total adsorption amount of adsorption element: 0.4 kg), and 1,4-dioxane 1000 mg / L. The water to be treated containing was introduced at 90 L / h to obtain treated water.
次に、１２０℃の水蒸気を吸着材に供給して吸着材の付着水を除去（脱水）した後、除去水は水処理装置の被処理水へ返送した。続いて、１２０℃の水蒸気を吸着材に供給し脱着を実施した。脱着に使用した水蒸気および吸着材から脱着された１，４−ジオキサンは凝縮器にて液化され濃縮水として回収した。脱水および脱着に使用した水蒸気量は、９６０ｇ／ｈであった。吸着時間は２０ｍｉｎとして切替サイクルとした。その際の処理水中の１，４−ジオキサン濃度は、０．０５ｍｇ／Ｌであった。また、濃縮水は水量７００ｍＬ／ｈであった。 Next, water at 120 ° C. was supplied to the adsorbent to remove (dehydrate) the adhering water on the adsorbent, and the removed water was returned to the water to be treated in the water treatment apparatus. Subsequently, desorption was performed by supplying water vapor at 120 ° C. to the adsorbent. The water vapor used for desorption and 1,4-dioxane desorbed from the adsorbent were liquefied in a condenser and recovered as concentrated water. The amount of water vapor used for dehydration and desorption was 960 g / h. The adsorption time was set to 20 min and a switching cycle was set. The 1,4-dioxane concentration in the treated water at that time was 0.05 mg / L. The concentrated water had a water volume of 700 mL / h.
表１に示すように、本比較例の水処理装置により浄化された水は、０．４ｋｇの吸着素子で、処理水中の１，４−ジオキサン濃度が０．０５ｍｇ／Ｌであり、参考例１および実施例２と比べて処理水中の１，４−ジオキサン濃度が１０倍以上高かった。 As shown in Table 1, the water is cleaned by the water treatment apparatus of this comparative example, in the adsorption element of 0.4 kg, 1,4-dioxane concentration in the treated water is 0.05 mg / L, Reference Example 1 And compared with Example 2, the 1, 4- dioxane density | concentration in treated water was 10 times or more higher.
[比較例２]
比較例１の水処理装置の処理水を比較例１と同一の水処理装置で再処理を行った。その結果、表１に示すように、本比較例の水処理装置により浄化された水は、処理水中の１，４−ジオキサン濃度は０．００５ｍｇ／Ｌ以下であり、参考例１および実施例２と同一の処理性能を示したが、使用した吸着素子の量は０．８ｋｇと実施例１および２と比較して２倍以上必要とした。また、表２に示すように、本比較例にて使用した水蒸気量の合計は１８２０ｇ／ｈと参考例１および実施例２と比べて２倍以上必要とし、濃縮水量についても１４００ｍＬ／ｈと参考例１および実施例２と比べて２倍以上排出量が多く、濃縮水を別途処理するコストが高くなる結果となった。
[Comparative Example 2]
The treated water of the water treatment device of Comparative Example 1 was retreated with the same water treatment device as that of Comparative Example 1. As a result, as shown in Table 1, the water purified by the water treatment device of this comparative example had a 1,4-dioxane concentration of 0.005 mg / L or less in the treated water, and Reference Example 1 and Example 2 However, the amount of the adsorbing element used was 0.8 kg, which was more than twice that of Examples 1 and 2. Further, as shown in Table 2, the total amount of steam used in this comparative example requires more than twice as compared with 1820 g / h as in Reference Example 1 and Example 2, and 1400 mL / h also concentrated water Reference Compared with Example 1 and Example 2, the amount of discharge was twice or more, resulting in an increase in the cost of separately treating the concentrated water.
本発明による水処理装置は、基本的に吸着素子の交換の必要が無く、被処理水中の有機物質を高い効率で連続的に除去するとともに、従来の水処理装置と比べて少ない吸着素子充填量で、低コストに水処理ができる利点があり産業界への寄与大である。 The water treatment apparatus according to the present invention basically eliminates the need for replacement of the adsorbing elements, continuously removes organic substances in the water to be treated with high efficiency, and has a smaller adsorbing element filling amount than the conventional water treatment apparatus. Therefore, it has the advantage of being able to treat water at a low cost, and contributes greatly to the industry.
１１０：第１処理槽
１１１：吸着材
１２０：第２処理槽
１２１：吸着材
１３０：第３処理槽
１３１：吸着材
110: first treatment tank 111: adsorbent 120: second treatment tank 121: adsorbent 130: third treatment tank 131: adsorbent
Claims (4)
前記各処理槽が、吸着素子に有機物質を含有する被処理水を接触させることで有機物質を吸着除去して処理水を排出する吸着槽、前記吸着槽から排出された処理水を接触させることで有機物質を吸着除去して第２処理水を排出する追吸着槽、および加熱ガスを該吸着素子に接触させることで吸着した有機物質を該吸着素子から脱着させる脱着槽、のいずれかとして機能し、
前記吸着槽として機能する処理槽と前記追吸着槽として機能する処理槽が、この順番で直列に通液される流路構成をとり、
一方の処理槽が吸着槽として機能している間は、他方の処理槽は追吸着槽として機能し、
一方の処理層が脱着槽として機能している間は、他方の処理槽は待機状態となり、かつ被処理水は貯水され、
一方の処理槽が追吸着槽として機能している間は、他方の処理槽は吸着槽として機能し、
一方の処理槽が待機状態である間は、他方の処理槽は脱着槽として機能し、かつ被処理水は貯水され、
前記各処理槽のうち、吸着漕として機能した処理槽は脱着漕に移行され、脱着槽として機能した処理槽は追吸着槽に移行され、かつ、追吸着槽として機能した処理槽は待機状態に移行され、かつ、待機状態の処理槽は吸着槽に移行される、
ことを特徴とする水処理装置。 A water treatment apparatus provided with two treatment tanks containing adsorption elements,
Each of the treatment tanks makes contact with water to be treated containing an organic substance by adsorbing elements to adsorb and remove organic substances to discharge the treated water, and makes the treated water discharged from the adsorption tank contact. Functions as either a secondary adsorption tank for adsorbing and removing organic substances and discharging the second treated water, and a desorption tank for desorbing organic substances adsorbed by bringing heated gas into contact with the adsorption element And
The processing bath to function as the add adsorption vessel and process vessel which serves as an adsorption vessel, takes a flow path configuration to be passed through in series in this order,
While one processing tank functions as an adsorption tank, the other processing tank functions as a supplementary adsorption tank,
While one treatment layer functions as a desorption tank, the other treatment tank is in a standby state, and the treated water is stored,
While one treatment tank is functioning as an additional adsorption tank, the other treatment tank functions as an adsorption tank,
While one treatment tank is in a standby state, the other treatment tank functions as a desorption tank, and the treated water is stored,
Among the treatment tanks, the treatment tank functioning as an adsorption tank is shifted to a desorption tank, the treatment tank functioning as a desorption tank is shifted to a supplementary adsorption tank, and the treatment tank functioning as a supplementary adsorption tank is in a standby state. The processing tank in the standby state is transferred to the adsorption tank,
The water treatment apparatus characterized by the above-mentioned.
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| S111 | Request for change of ownership or part of ownership |
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| R350 | Written notification of registration of transfer |
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