JP4991892B2

JP4991892B2 - Water treatment system

Info

Publication number: JP4991892B2
Application number: JP2010056632A
Authority: JP
Inventors: 忍茂庭; 英武仕入; 恭介片山; 正彦堤; 聡美海老原; 伸行足利; 智明木内; 厚山崎; 和彦納田
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2010-03-12
Filing date: 2010-03-12
Publication date: 2012-08-01
Anticipated expiration: 2030-03-12
Also published as: JP2011189257A

Description

本発明は、排水中に含まれる油分を分離して回収する水処理システムに関する。 The present invention relates to a water treatment system that separates and recovers oil contained in waste water.

一般に食品工場等の産業社会システムから排出される工場排水に含まれる油分は、鉄やアルミニウム塩を用いる凝集剤処理や、微細な気泡への付着性を利用する加圧浮上処理などによって、油分含有汚泥として産業廃棄物として処分されている。汚泥発生の抑制や油分の選択除去の必要性の観点から、例えば特許文献１〜３などにおいて前記油分除去技術の他に油分含有排水処理方法として油分吸着剤を用いた除去技術が提案されている。 In general, oil contained in industrial wastewater discharged from industrial and social systems such as food factories contains oil by flocculant treatment using iron or aluminum salt, or pressure flotation treatment that uses adhesion to fine bubbles. It is disposed of as industrial waste as sludge. From the viewpoint of the necessity of suppressing sludge generation and the selective removal of oil, for example, Patent Documents 1 to 3 propose a removal technique using an oil adsorbent as an oil-containing wastewater treatment method in addition to the oil removal technique. .

特許文献１では、廃水中の油分を選択除去するために、油分と親和性の高い表面特性を有する油分分離剤材（吸着剤）を被処理水と接触させ、排水に含まれる油分を除去する方法と、油分吸着後の分離剤に、気泡を導入することで、吸着油分の脱離を行い、油分を回収する方法とが提案されている。 In Patent Document 1, in order to selectively remove oil in wastewater, an oil separation agent material (adsorbent) having surface characteristics with high affinity to the oil is brought into contact with the water to be treated, and the oil contained in the wastewater is removed. There have been proposed a method and a method of desorbing the adsorbed oil by introducing bubbles into the separating agent after adsorbing the oil and recovering the oil.

また、特許文献２では、水上に浮遊する油分を吸着する、磁性体を介した油分除去と、磁力を用いた回収方法が提案されている。 Further, Patent Document 2 proposes a method for removing oil components via a magnetic material that adsorbs oil components floating on water and a recovery method using magnetic force.

また、特許文献３では、磁性体を核とした油分吸着材を使用し、使用済み油分吸着剤の溶媒再生により吸着剤を再利用する方法が提案されている。 Patent Document 3 proposes a method of reusing an adsorbent by regenerating a used oil adsorbent by using an oil adsorbent having a magnetic material as a core.

特開２００４−３０５９２７号公報JP 2004-305927 A 特開２０００−１７６３０６号公報JP 2000-176306 A 特開２００５−１７７５３２号公報JP 2005-177532 A

しかしながら、特許文献１の油分脱離方法においては、吸着剤（分離剤）の再利用を図ることは可能であるが、脱離油分と水分とが混在する。油分を吸着した吸着剤（分離剤）は、水処理系統にて安定に保持されず、処理水中に流出すると、油分除去・回収能低下を引き起こすばかりではなく、後段に配される水処理系統へ悪影響を及ぼす。 However, in the oil desorption method of Patent Document 1, it is possible to reuse the adsorbent (separating agent), but the desorbed oil and water are mixed. The adsorbent that adsorbs oil (separator) is not stably retained in the water treatment system, and if it flows into the treated water, it not only causes oil removal / recovery performance decline, but also leads to a water treatment system that is arranged in the subsequent stage. Adversely affect.

また、特許文献２の回収方法は、海洋等の広範囲な処理では油分回収する方法の１つとなり得るが、排水処理では油分は水面に浮上する成分のほかに水中に浮遊する成分もあるため、必ずしも産業社会システムから排出される排水中の油分の回収には適さない。磁性体粒子を用いた油分除去では、例えば、油分は被処理系から排除するのみならば、弊害はないものの、油分をリサイクルすることを考慮した場合、使用済みの当該粒子を選択除去することの他に、被処理水中に含まれる選択除去の弊害となる成分を事前に排除する必要がある。 In addition, the recovery method of Patent Document 2 can be one of the methods for recovering oil in a wide range of treatments such as the ocean, but in wastewater treatment, there are components that float in water in addition to components that float on the water surface. It is not necessarily suitable for oil recovery in wastewater discharged from industrial and social systems. In oil removal using magnetic particles, for example, if the oil is only removed from the system to be treated, there is no harmful effect, but when considering the recycling of the oil, the used particles can be selectively removed. In addition, it is necessary to eliminate in advance components that are harmful to selective removal contained in the water to be treated.

また、特許文献３の再利用方法は、被処理水に事前に凝集剤を添加した後に油分吸着処理をしているため、油分のほかに凝集剤成分や含有する固形分も一緒に除去される可能性があり、溶媒再生によって得られる油分の再利用には適さない。 Moreover, since the reuse method of patent document 3 is adding the flocculant to the to-be-processed water beforehand and performing the oil component adsorption process, the flocculent component and solid content to be contained are also removed together with the oil component. There is a possibility, and it is not suitable for the reuse of the oil obtained by solvent regeneration.

一方、排水中の油分は、鉱物油であれば化石燃料が、植物油であれば穀類が主な原料であり、これらの主原料の大部分は輸入に依存するものである。現状では、この排水中の油分は汚泥として廃棄されているのが主流である。 On the other hand, the oil content in the wastewater is a fossil fuel if it is a mineral oil, and cereals if it is a vegetable oil. Most of these main materials depend on imports. At present, the oil in this wastewater is mainly discarded as sludge.

このような背景から、国内や海外における輸入炭素源に対する総利用率を向上させ、二酸化炭素排出量の削減を目的として、排水中の油分のエネルギー利用を進めることにより、環境浄化と併せたメリットが見出せる。このため、排水中に含まれる油分を選択的に除去する方法の必要性が増してきている。 Against this background, improving the total utilization rate of imported carbon sources in Japan and overseas and promoting the use of energy in oil in the wastewater for the purpose of reducing carbon dioxide emissions will have benefits in conjunction with environmental purification. I can find it. For this reason, the necessity of the method of selectively removing the oil component contained in waste_water | drain has increased.

本発明は、上述した課題を解決するためになされたものであり、油分を含む被処理水中から効率よく油分を分離して回収することができる水処理システムを提供することを目的とする。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a water treatment system capable of efficiently separating and recovering oil from treated water containing oil.

本発明に係る水処理システムは、被処理水中に含まれる固形分を重力の作用により分離除去する固形分除去前処理装置および被処理水中に含まれる固形分を磁場の作用により分離除去する磁気分離前処理装置のうちの少なくとも一方を有する前処理装置と、前記前処理装置で処理された被処理水にマグネタイトを含有する油分吸着剤を接触させ、被処理水中に含まれる油分を前記油分吸着剤に吸着させて分離する油分除去装置と、前記油分除去装置で処理された被処理水から油分を吸着した油分吸着剤を分離して回収する吸着剤回収装置と、を具備することを特徴とする。 The water treatment system according to the present invention includes a solid content removal pretreatment device that separates and removes solids contained in water to be treated by the action of gravity, and a magnetic separation that separates and removes solids contained in the water to be treated by the action of a magnetic field. A pretreatment device having at least one of the pretreatment devices, and an oil adsorbent containing magnetite in contact with the water to be treated which has been treated by the pretreatment device, and the oil contained in the water to be treated is converted into the oil adsorbent. And an oil removing device that separates and collects the oil adsorbent that has adsorbed the oil from the treated water treated by the oil removing device. .

本発明の水処理システムによれば、被処理水を油分除去装置に供給する前に、前処理装置により被処理水から固形分の一部を除去するようにしているため、油分除去装置よりも後段に配置される吸着剤回収装置などの水処理系統に対して悪影響を及ぼすことなく、被処理水中から効率よく油分を分離・回収することができる。 According to the water treatment system of the present invention, since the pretreatment device removes a part of the solid content from the treated water before supplying the treatment water to the oil removal device, it is more than the oil removal device. Oil can be efficiently separated and recovered from the water to be treated without adversely affecting the water treatment system such as the adsorbent recovery device disposed in the subsequent stage.

本発明の第１の実施形態に係る水処理システムを示す構成ブロック図。1 is a configuration block diagram showing a water treatment system according to a first embodiment of the present invention. 本発明の第２の実施形態に係る水処理システムを示す構成ブロック図。The block diagram which shows the water treatment system which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る水処理システムを示す構成ブロック図。The block diagram which shows the water treatment system which concerns on the 3rd Embodiment of this invention. 本発明の第４の実施形態に係る水処理システムを示す構成ブロック図。The block diagram which shows the water treatment system which concerns on the 4th Embodiment of this invention.

本発明を実施するための好ましい形態を以下に説明する。 Preferred modes for carrying out the present invention will be described below.

（１）本発明の水処理システムは、被処理水中に含まれる固形分を重力の作用により分離除去する固形分除去前処理装置および被処理水中に含まれる固形分を磁場の作用により分離除去する磁気分離前処理装置のうちの少なくとも一方を有する前処理装置と、前記前処理装置で処理された被処理水にマグネタイトを含有する油分吸着剤を接触させ、被処理水中に含まれる油分を前記油分吸着剤に吸着させて分離する油分除去装置と、前記油分除去装置で処理された被処理水から油分を吸着した油分吸着剤を分離して回収する吸着剤回収装置とを有する。 (1) The water treatment system of the present invention separates and removes the solid content contained in the water to be treated by the action of a magnetic field and the solid content removal pretreatment device that separates and removes the solid content contained in the water to be treated. A pretreatment device having at least one of the magnetic separation pretreatment devices, and an oil adsorbent containing magnetite in contact with the water to be treated which has been treated by the pretreatment device, and the oil contained in the water to be treated, An oil removing device that absorbs and separates the adsorbent, and an adsorbent collecting device that separates and collects the oil adsorbent that has adsorbed the oil from the water to be treated treated by the oil removing device.

本発明では、被処理水を油分除去装置で処理する前に、前処理装置により被処理水からある程度の量の固形分をあらかじめ分離除去し、被処理水の固形分濃度を低下させているため、油分分離装置より後段に配置される吸着剤回収装置にかかる負荷が軽減され、油分を吸着した油分吸着剤の回収率が向上する。ここで、被処理水に含まれる固形分には、水より比重が大きい固体粒子、例えば金属粒子、金属酸化物粒子、砂粒のようなセラミック粒子など各種の粒子がある。これらの固形分は、吸着剤回収装置にて油分を吸着した油分吸着剤を回収する際に、被処理水からの油分吸着剤の分離作用を阻害し、吸着剤の回収率を低下させる。そのため本発明では、前処理装置を用いて被処理水の固形分濃度を低下させ、後段の吸着剤回収装置における負荷軽減を図っている。なお、本発明では油分吸着剤がマグネタイト（Fe₃O₄）を含有しているため、水との比重差を利用する遠心分離法ばかりでなく磁場の作用を利用する磁気分離法を用いて油分吸着剤を分離することができる。 In the present invention, before the water to be treated is treated with the oil removing device, a certain amount of solid content is separated and removed from the water to be treated by the pretreatment device in advance to reduce the solid content concentration of the water to be treated. Further, the load applied to the adsorbent recovery device disposed downstream from the oil separator is reduced, and the recovery rate of the oil adsorbent that has adsorbed the oil is improved. Here, the solid content contained in the water to be treated includes various particles such as solid particles having a specific gravity greater than that of water, for example, metal particles, metal oxide particles, and ceramic particles such as sand particles. These solid contents inhibit the separation action of the oil adsorbent from the water to be treated when the oil adsorbent that has adsorbed the oil is recovered by the adsorbent recovery device, and reduce the recovery rate of the adsorbent. Therefore, in this invention, the solid content density | concentration of to-be-processed water is reduced using a pre-processing apparatus, and the load reduction in an adsorbent collection | recovery apparatus of a back | latter stage is aimed at. In the present invention, since the oil adsorbent contains magnetite (Fe ₃ O ₄ ), not only the centrifugal separation method using the difference in specific gravity with water but also the magnetic separation method using the action of a magnetic field. The adsorbent can be separated.

（２）上記（１）において、前記吸着剤回収装置から排出される油分を吸着した油分吸着剤を受け入れ、該油分吸着剤から油分を分離抽出する油分回収装置をさらに有することが好ましい（図２）。油分回収装置では、油分を吸着した油分吸着剤から油分を抽出するための媒体として、例えば各種のアルコール、飽和炭化水素、超臨界二酸化炭素、水蒸気などを用いることができる。これらの媒体は、抽出した油分との分離が容易であること、および精製して再利用することが容易であることなどの性質を備えている。 (2) In the above (1), it is preferable to further include an oil content recovery device that receives the oil content adsorbent that has adsorbed the oil content discharged from the adsorbent recovery device and separates and extracts the oil content from the oil content adsorbent (FIG. 2). ). In the oil content recovery device, for example, various alcohols, saturated hydrocarbons, supercritical carbon dioxide, water vapor, and the like can be used as a medium for extracting the oil content from the oil adsorbent that has adsorbed the oil. These media have properties such as being easy to separate from the extracted oil and being easy to refine and reuse.

（３）上記（２）において、前記油分回収装置から前記油分除去装置までの間に設けられ、前記油分除去装置から排出される油分吸着剤を前記油分除去装置において被処理水の油分除去に再度利用するために、前記油分回収装置から排出される油分吸着剤を前記油分除去装置に返戻するリターン経路をさらに有することが好ましい（図２）。回収した油分吸着剤をリターン経路により油分除去装置に戻して吸着剤を再利用することで、さらに処理コストが低減される。 (3) In the above (2), the oil adsorbent provided between the oil collecting device and the oil removing device and discharged from the oil removing device is again used for removing oil from the water to be treated in the oil removing device. In order to use, it is preferable to further have a return path for returning the oil adsorbent discharged from the oil recovery device to the oil removal device (FIG. 2). By returning the recovered oil adsorbent to the oil removing device via the return path and reusing the adsorbent, the processing cost is further reduced.

（４）上記（１）〜（３）において、前記吸着剤回収装置は、遠心力により被処理水から油分吸着剤を分離する液体サイクロンであることが好ましい（図１〜図４）。液体サイクロンは、被処理水を容器上部の内周壁の接線に沿って導入する上部入口と、上部から下部に移行するに従って漸次縮径する逆円錐状の容器本体と、容器本体の下部中央に開口し、比重の小さい成分を容器上部に案内して外部へ排出する排出管と、比重の大きい成分を容器下部に集めて沈降させる沈殿室と、を備えている。このような液体サイクロンを用いると、油分吸着剤を適切に回収することができる。 (4) In said (1)-(3), it is preferable that the said adsorption agent collection | recovery apparatus is a liquid cyclone which isolate | separates oil content adsorption agent from to-be-processed water with a centrifugal force (FIGS. 1-4). The hydrocyclone has an upper inlet that introduces water to be treated along the tangent line of the inner peripheral wall of the upper part of the container, an inverted conical container body that gradually decreases in diameter as it moves from the upper part to the lower part, and an opening at the lower center of the container body. And a discharge pipe that guides components having a low specific gravity to the upper portion of the container and discharges them to the outside, and a sedimentation chamber that collects components having a higher specific gravity at the lower portion of the container and settles them. When such a liquid cyclone is used, the oil adsorbent can be appropriately recovered.

（５）上記（１）〜（４）において、前記吸着剤回収装置は、磁場の作用により被処理水から油分吸着剤を分離する磁気分離装置であることが好ましい（図１〜図４）。磁気分離装置は、被処理水が流れる流路内に配置される非磁性の網状構造体と、この網状構造体が配置された流路の周囲を取り囲むように配置される磁気コイルと、を備えている。このような磁気分離装置を用いると、マグネタイトを含む油分吸着剤を適切に回収することができる。 (5) In said (1)-(4), it is preferable that the said adsorption agent collection | recovery apparatus is a magnetic separation apparatus which isolate | separates oil adsorption agent from to-be-processed water by the effect | action of a magnetic field (FIGS. 1-4). The magnetic separation apparatus includes a non-magnetic network structure disposed in a flow path through which water to be treated flows, and a magnetic coil disposed so as to surround the flow path in which the network structure is disposed. ing. When such a magnetic separator is used, the oil adsorbent containing magnetite can be recovered appropriately.

（６）上記（１）〜（５）において、前記吸着剤回収装置は、遠心力により被処理水から油分吸着剤を分離する液体サイクロンと、前記液体サイクロンの下流側に配置され、前記液体サイクロンで処理された被処理水から磁場の作用により油分吸着剤を分離する磁気分離装置と、を有することが好ましい（図１〜図４）。先ず液体サイクロンを用いて油分を吸着した油分吸着剤を粗く分離除去した後に、これに引き続き磁気分離装置を用いて残りの油分吸着剤を精密に分離除去するので、油分吸着剤をさらに高効率で回収することができる。 (6) In the above (1) to (5), the adsorbent recovery device is disposed on the downstream side of the liquid cyclone that separates the oil adsorbent from the water to be treated by centrifugal force, and the liquid cyclone. It is preferable to have a magnetic separation device that separates the oil adsorbent from the water to be treated that has been treated in step 1 by the action of a magnetic field (FIGS. 1 to 4). First, the oil adsorbent that has adsorbed oil using a liquid cyclone is roughly separated and removed, and then the remaining oil adsorbent is precisely separated and removed using a magnetic separation device. It can be recovered.

（７）上記（１）〜（６）において、前記前処理装置は、遠心力により被処理水から油分吸着剤を分離する液体サイクロンであることが好ましい（図１〜図４）。前処理装置にも液体サイクロンを用いることができる。液体サイクロンにより固形分を効率よく分離除去し、固形分濃度の低い被処理水を後段の吸着剤回収装置に供給することができるので、吸着剤回収装置にかかる負荷が軽減される。 (7) In the above (1) to (6), the pretreatment device is preferably a liquid cyclone that separates the oil adsorbent from the water to be treated by centrifugal force (FIGS. 1 to 4). A liquid cyclone can also be used for the pretreatment device. Since the solid content can be efficiently separated and removed by the liquid cyclone and the water to be treated having a low solid content concentration can be supplied to the adsorbent recovery device in the subsequent stage, the load on the adsorbent recovery device is reduced.

（８）上記（１）〜（７）において、前記前処理装置を複数配することができる（図４）。複数の前処理装置により多量の被処理水を同時並行処理することができるばかりでなく、運転と休止を交互に繰り返すローテーション稼動を実施することが可能になり、水処理システム全体を停止させることなく、部分的に休止した前処理装置のメンテナンス作業を行うことができる。 (8) In the above (1) to (7), a plurality of the pretreatment devices can be arranged (FIG. 4). Not only can a large amount of water to be treated be processed simultaneously in parallel by multiple pretreatment devices, but it is also possible to carry out a rotation operation that alternately repeats operation and stoppage without stopping the entire water treatment system. It is possible to perform maintenance work on the pretreatment apparatus that has been partially suspended.

（９）上記（１）〜（８）において、前記吸着剤回収装置を複数配することができる（図４）。複数の吸着剤回収装置により多量の被処理水を同時並行処理することができるばかりでなく、運転と休止を交互に繰り返すローテーション稼動を実施することが可能になり、水処理システム全体を停止させることなく、部分的に休止した吸着剤回収装置のメンテナンス作業を行うことができる。 (9) In the above (1) to (8), a plurality of the adsorbent recovery devices can be arranged (FIG. 4). Not only can a large amount of water to be treated be processed simultaneously by multiple adsorbent recovery devices, but also rotation operations that can be repeated between operation and suspension can be performed, and the entire water treatment system can be stopped. The maintenance work of the adsorbent recovery device that has been partially stopped can be performed.

（１０）上記（１）〜（９）において、前記吸着剤回収装置から排出される油分除去後の処理水を貯留する処理水貯槽と、前記処理水貯槽から前記前処理装置までの間に設けられ、前記処理水貯槽の処理水を逆洗浄水として前記前処理装置に供給するための経路と、をさらに有することが好ましい（図３）。 (10) In the above (1) to (9), a treated water storage tank for storing treated water after oil removal discharged from the adsorbent recovery device is provided between the treated water storage tank and the pretreatment device. It is preferable to further include a path for supplying treated water in the treated water storage tank to the pretreatment device as backwash water (FIG. 3).

上記（８）のように複数の前処理装置を配置した場合にとくに有効であり、運転と休止を交互に繰り返すローテーション稼動を実施することが可能になり、水処理システム全体を停止させることなく、一部の前処理装置のみを部分的に休止させて逆洗浄することができる。 It is particularly effective when a plurality of pretreatment devices are arranged as in (8) above, and it becomes possible to carry out a rotation operation that alternately repeats operation and stoppage, without stopping the entire water treatment system, Only some of the pretreatment devices can be partially rested and back cleaned.

（１１）上記（１）〜（１０）において、前記吸着剤回収装置から排出される油分除去後の処理水を貯留する処理水貯槽と、前記処理水貯槽から前記吸着剤回収装置までの間に設けられ、前記処理水貯槽の処理水を逆洗浄水として前記吸着剤回収装置に供給するための経路と、をさらに有することが好ましい（図３）。 (11) In the above (1) to (10), a treated water storage tank for storing treated water after oil removal discharged from the adsorbent recovery device, and between the treated water storage tank and the adsorbent recovery device. And a path for supplying the treated water in the treated water storage tank to the adsorbent recovery device as backwash water (FIG. 3).

上記（９）のように複数の吸着剤回収装置を配置した場合にとくに有効であり、運転と休止を交互に繰り返すローテーション稼動を実施することが可能になり、水処理システム全体を停止させることなく、一部の吸着剤回収装置のみを部分的に休止させて逆洗浄することができる。 It is particularly effective when a plurality of adsorbent recovery devices are arranged as in (9) above, and it is possible to carry out a rotation operation that alternately repeats operation and suspension, without stopping the entire water treatment system. Only part of the adsorbent recovery device can be partially rested and backwashed.

（１２）上記（１）〜（１１）において、前記油分除去装置に前記油分吸着剤を供給する吸着剤供給装置と、前記吸着剤回収装置から排出される油分除去後の処理水を貯留する処理水貯槽と、前記処理水貯槽から前記吸着剤供給装置までの間に設けられ、前記処理水貯槽の処理水を前記油分吸着剤に添加混合して混合スラリーを生成するための経路と、をさらに有することが好ましい（図３）。 (12) In the above (1) to (11), an adsorbent supplying device that supplies the oil adsorbent to the oil removing device, and a process for storing treated water after oil removal discharged from the adsorbent collecting device. A water storage tank and a path provided between the treated water storage tank and the adsorbent supply device, for adding and mixing the treated water in the treated water storage tank to the oil adsorbent, and generating a mixed slurry. It is preferable to have (FIG. 3).

このような経路を介して油分除去後の処理水を吸着剤供給装置へ供給することで、粉体状の油分吸着剤に処理水を添加し、さらに混合して所望の粘性を有する混合スラリーを生成することができる。 By supplying the treated water after oil removal to the adsorbent supply device through such a path, the treated water is added to the powdery oil adsorbent and further mixed to obtain a mixed slurry having a desired viscosity. Can be generated.

以下、添付の図面を参照して本発明を実施するための種々の好ましい形態を説明する。 Hereinafter, various preferred embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

（第１の実施形態）
図１を参照して本発明の第１の実施形態を説明する。 (First embodiment)
A first embodiment of the present invention will be described with reference to FIG.

本実施形態の水処理システム１は、原水槽２、固形分除去前処理装置３、磁気分離前処理装置４、吸着剤供給装置８を備えた油分除去装置５、吸着剤回収装置６および処理水磁気分離装置７を有している。これらの装置および槽がポンプＰ１〜Ｐ６を備えたラインＬ１〜Ｌ６によりほぼ直列に接続され、上流側の原水槽２から下流側の磁気分離装置７に向けて被処理水が通流するように図示しない制御器によりポンプＰ１〜Ｐ６や図示しないバルブ等の動作がコントロールされるようになっている。 The water treatment system 1 of the present embodiment includes a raw water tank 2, a solid content removal pretreatment device 3, a magnetic separation pretreatment device 4, an oil removal device 5 equipped with an adsorbent supply device 8, an adsorbent recovery device 6, and treated water. A magnetic separation device 7 is included. These devices and tanks are connected in series by lines L1 to L6 equipped with pumps P1 to P6 so that the water to be treated flows from the raw water tank 2 on the upstream side to the magnetic separation device 7 on the downstream side. Operations of the pumps P1 to P6 and valves (not shown) are controlled by a controller (not shown).

原水槽２は、例えば製油、製鉄、機械、金属、繊維、食品のような油脂類を取り扱う工場から排出された含油廃水を被処理水として貯留している。このような含油廃水は、エマルジョン化した油分を水中に多量に含み、単に静置しておいただけでは油分が水から分離しにくいものもある。さらに、含油廃水は、無視できない量の固形分も含んでいる。固形分には、水より比重が大きい固体粒子、例えば金属粒子、金属酸化物粒子、砂粒のようなセラミック粒子など各種の粒子がある。これらの固形分は、後段の吸着剤回収装置６や処理水磁気分離装置７において油分を吸着した油分吸着剤を回収する際に、被処理水からの油分吸着剤の分離作用を阻害し、吸着剤の回収率を低下させる。このため本実施形態のシステム１においては、固形分除去前処理装置３および磁気分離前処理装置４を用いて固形分を予め除去した後に、後段の油分除去装置５や吸着剤回収装置６に供給するようにしている。 The raw water tank 2 stores, as treated water, oil-containing wastewater discharged from a factory that handles oils and fats such as oil, iron, machinery, metal, fiber, and food. Such oil-containing wastewater contains a large amount of emulsified oil in water, and there are some oils that are difficult to separate from water simply by standing still. In addition, oil-containing wastewater contains a non-negligible amount of solids. The solid content includes various particles such as solid particles having a specific gravity greater than that of water, such as metal particles, metal oxide particles, and ceramic particles such as sand particles. These solid contents inhibit the separation action of the oil adsorbent from the water to be treated when recovering the oil adsorbent that has adsorbed the oil in the adsorbent collecting apparatus 6 or the treated water magnetic separation apparatus 7 in the subsequent stage. Reduces agent recovery. For this reason, in the system 1 of the present embodiment, the solid content is removed in advance using the solid content removal pretreatment device 3 and the magnetic separation pretreatment device 4 and then supplied to the subsequent oil content removal device 5 and the adsorbent recovery device 6. Like to do.

固形分除去前処理装置３は、ポンプＰ１の駆動によりラインＬ１を介して原水槽２から被処理水を受け入れ、被処理水中に含まれる固形分を重力の作用により固液分離し、上部排出ラインＬ２１を介して比重の小さい成分を排出し、下部排出ライン２２を介して固形分などの比重の大きい成分を排出するものである。固形分除去前処理装置３として、重力の作用により固形分を沈降させる沈殿槽、あるいは固形分を遠心力分離する液体サイクロンなどを用いることができる。固形分除去前処理装置３に液体サイクロンを用いた場合、沈殿槽よりも省スペース化が図られるが、固形分除去前処理装置３へ供給される液流量変動を抑制できるように、前段に貯槽を設けるなど規定流量以下での被処理水の供給を抑制する制御装置などを設けることがより望ましい。 The solid content removal pretreatment device 3 receives the water to be treated from the raw water tank 2 through the line L1 by driving the pump P1, and separates the solid content contained in the water to be treated by the action of gravity, and the upper discharge line. A component having a small specific gravity is discharged through L21, and a component having a large specific gravity such as a solid content is discharged through a lower discharge line 22. As the solid content removal pretreatment device 3, a sedimentation tank that sediments the solid content by the action of gravity, or a liquid cyclone that separates the solid content by centrifugal force can be used. When a liquid cyclone is used for the solid content removal pretreatment device 3, a space saving can be achieved as compared with the settling tank, but a storage tank is provided in the previous stage so that fluctuations in the flow rate of the liquid supplied to the solid content removal pretreatment device 3 can be suppressed. It is more desirable to provide a control device that suppresses the supply of water to be treated at a specified flow rate or less.

磁気分離前処理装置４は、入口側が固形分除去前処理装置３の上部排出ラインＬ２１に接続され、固形分除去前処理装置３により固形分を粗く除去した被処理水（一次除去処理水）が導入され、この一次除去処理水から固形分をさらに精密に除去するものである。磁気分離前処理装置４は、流路の内部に多段に配置された非磁性の網状構造体４ａと、一次除去処理水の通流方向に対して直交する鉛直磁場を与える磁気コイル４ｂとを備えている。網状構造体４ａとして樹脂メッシュまたは非磁性のオーステナイト系ステンレス鋼メッシュを用いることができる。また、磁場生成手段は、本実施形態の磁気コイルのみに限定されるものではなく、電磁石や永久磁石を用いてもよい。 The magnetic separation pretreatment device 4 is connected to the upper discharge line L21 of the solid content removal pretreatment device 3 at the inlet side, and the treated water (primary removal treated water) from which the solid content is roughly removed by the solid content removal pretreatment device 3 is obtained. Introduced, the solid content is removed more precisely from the primary removal treated water. The magnetic separation pretreatment device 4 includes a nonmagnetic network structure 4a arranged in multiple stages inside a flow path, and a magnetic coil 4b that applies a vertical magnetic field orthogonal to the flow direction of the primary removal treated water. ing. As the network structure 4a, a resin mesh or a nonmagnetic austenitic stainless steel mesh can be used. Further, the magnetic field generating means is not limited to the magnetic coil of this embodiment, and an electromagnet or a permanent magnet may be used.

さらに、磁気分離前処理装置４の内部流路には逆洗浄ラインＬ３１，Ｌ３２が接続され、運転を休止するメンテナンス時においてラインＬ３１を通って逆洗浄水が内部流路に供給され、ラインＬ３２を介して逆洗浄水を排出することにより、網状構造体４ａが逆洗浄されるようになっている。なお、磁気分離前処理装置４の前後に圧力計（図示せず）を設け、両者の差圧を計測監視し、その差圧が一定値以上に上昇したときに、一次除去処理水の供給を停止し、磁気分離前処理装置４の内部流路にラインＬ３１から逆洗浄水を供給するようにしてもよい。メンテナンス中は、磁気分離前処理装置４により一次除去処理水を処理できなくなるため、磁気分離前処理装置４を並列多段に配し、常に一次除去処理水を処理できるようにすることがより好適である。 Further, reverse cleaning lines L31 and L32 are connected to the internal flow path of the magnetic separation pretreatment device 4, and back cleaning water is supplied to the internal flow path through the line L31 during maintenance when operation is suspended. By discharging the backwashing water through the network structure 4a, the network structure 4a is backwashed. A pressure gauge (not shown) is provided before and after the magnetic separation pretreatment device 4 to measure and monitor the differential pressure between the two, and when the differential pressure rises above a certain value, the primary removal treated water is supplied. You may make it stop and supply backwashing water to the internal flow path of the magnetic separation pretreatment apparatus 4 from the line L31. During the maintenance, since the primary removal treated water cannot be treated by the magnetic separation pretreatment device 4, it is more preferable to arrange the magnetic separation pretreatment devices 4 in parallel in multiple stages so that the primary removal treated water can always be treated. is there.

油分除去装置５は、入口側が磁気分離前処理装置４の排出ラインＬ３に接続され、磁気分離前処理装置４で固形分を精密に除去した被処理水（二次除去処理水）が導入され、この二次除去処理水から油分を分離するものである。油分除去装置５は、油分吸着剤供給器８を有し、油分吸着剤供給器８から所望の油分吸着剤が供給されるようになっている。油分吸着剤は、９０質量％以上のマグネタイト（Fe₃O₄）を含有している。 The oil removing device 5 is connected to the discharge line L3 of the magnetic separation pretreatment device 4 at the inlet side, and treated water (secondary removal treated water) from which the solid content has been accurately removed by the magnetic separation pretreatment device 4 is introduced, Oil is separated from this secondary removal treated water. The oil removing device 5 includes an oil adsorbent supplier 8, and a desired oil adsorbent is supplied from the oil adsorbent supplier 8. The oil adsorbent contains 90% by mass or more of magnetite (Fe ₃ O ₄ ).

油分吸着剤は、スラリー状、粒子状、粉体状のいずれの形態であっても被処理水に添加することができるが、とくにスラリー状の形態で添加することが望ましい。油分吸着剤が被処理水中に最も迅速かつ均一に混合・分散するからである。 The oil adsorbent can be added to the water to be treated in any form of slurry, particles, and powder, but it is particularly desirable to add it in a slurry form. This is because the oil adsorbent is mixed and dispersed most rapidly and uniformly in the water to be treated.

吸着剤回収装置６は、入口側が油分除去装置５の排出ラインＬ４に接続され、油分を吸着した使用済み油分吸着剤を伴う被処理水が導入され、この油分を吸着した使用済み油分吸着剤を分離・回収するものである。本実施形態では吸着剤回収装置６として液体サイクロンを用いた。液体サイクロン６は、ラインＬ４からの被処理水を容器上部の内周壁の接線に沿って導入する上部入口と、上部から下部に移行するに従って漸次縮径する逆円錐状の容器本体と、容器本体の下部中央に開口し、比重の小さい成分を容器上部に案内してラインＬ５１を介して外部へ排出する排出管と、比重の大きい成分を容器下部に集めて沈降させ、ラインＬ５２を介して沈殿物（固形分）を外部に排出する沈殿室と、を備えている。このような液体サイクロン６を用いると、油分吸着剤を効率よく回収することができる。 The adsorbent recovery device 6 is connected to the discharge line L4 of the oil removing device 5 at the inlet side, and the treated water with the used oil adsorbent that has adsorbed the oil is introduced, and the used oil adsorbent that adsorbs this oil is removed. It is to be separated and recovered. In the present embodiment, a liquid cyclone is used as the adsorbent recovery device 6. The hydrocyclone 6 includes an upper inlet for introducing water to be treated from the line L4 along the tangent line of the inner peripheral wall of the upper part of the container, an inverted conical container body that gradually decreases in diameter as it moves from the upper part to the lower part, and a container body Open to the center of the lower part of the pipe, guide the low specific gravity component to the top of the container and discharge it to the outside via the line L51, collect the high specific gravity component at the bottom of the container and let it settle, and then settling through the line L52 And a sedimentation chamber for discharging a substance (solid content) to the outside. When such a liquid cyclone 6 is used, the oil adsorbent can be efficiently recovered.

処理水磁気分離装置７は、吸着剤回収装置６から排出される吸着剤回収処理水と回収吸着剤のうち吸着剤回収装置６に含まれる油分吸着剤の残分を除去するものである。この処理水磁気分離装置７は、上述した磁気分離前処理装置４と実質的に同じ構造をもつものであり、流路の内部に多段に配置された非磁性の網状構造体７ａと、被処理水の通流方向に対して直交する鉛直磁場を与える磁気コイル７ｂとを備えている。また、処理水磁気分離装置７の内部流路には逆洗浄ラインＬ６１，Ｌ６２が接続され、運転を休止するメンテナンス時においてラインＬ６１を通って逆洗浄水が内部流路に供給され、ラインＬ６２を介して逆洗浄水を排出することにより、網状構造体７ａが逆洗浄されるようになっている。さらに、処理水磁気分離装置７の排出口は、ラインＬ６を介して図示しない後工程の装置（例えば処理水貯槽など）に連通している。 The treated water magnetic separator 7 removes the residue of the oil adsorbent contained in the adsorbent recovery device 6 from the adsorbent recovery treated water discharged from the adsorbent recovery device 6 and the recovered adsorbent. This treated water magnetic separation device 7 has substantially the same structure as the magnetic separation pretreatment device 4 described above, and includes a non-magnetic network structure 7a arranged in multiple stages inside the flow path, And a magnetic coil 7b for providing a vertical magnetic field orthogonal to the water flow direction. In addition, backwash lines L61 and L62 are connected to the internal flow path of the treated water magnetic separation device 7, and backwash water is supplied to the internal flow path through the line L61 during maintenance when operation is suspended. By discharging the backwashing water through the network structure 7a, the network structure 7a is backwashed. Furthermore, the discharge port of the treated water magnetic separation device 7 communicates with an apparatus (for example, treated water storage tank) in a subsequent process (not shown) via a line L6.

次に本実施形態の水処理システムの作用を説明する。 Next, the operation of the water treatment system of this embodiment will be described.

油分と固形分を含有する被処理水は、原水槽２から固形分除去前処理装置３に所定の流量で供給され、固形分除去前処理装置３により固形分が一次除去される。固形分前処理装置３から排出される一次除去処理水は、磁性固形分を除去する磁気分離前処理装置４へ供給され、磁気分離前処理装置４により磁性固形分が二次除去される。 The water to be treated containing oil and solid content is supplied from the raw water tank 2 to the solid content removal pretreatment device 3 at a predetermined flow rate, and the solid content is preliminarily removed by the solid content removal pretreatment device 3. The primary removal treated water discharged from the solid content pretreatment device 3 is supplied to the magnetic separation pretreatment device 4 that removes the magnetic solid content, and the magnetic solid content is secondarily removed by the magnetic separation pretreatment device 4.

次いで、二次除去処理水は、油分除去装置５に導入され、これに吸着剤供給装置８からマグネタイトを含有する油分吸着剤が添加される。添加された油分吸着剤と二次除去処理水中の油分とが接触し、油分が油分吸着剤に吸着し、これにより被処理水から油分が除去される。ここに用いる油分吸着剤とは、マグネタイト等の磁性体を核に使用し、表面や構造が油分吸着できるよう処理された形態など、公知の技術を用いればよく、磁性体の樹脂被覆処理や、微細粒子の造粒化物による細孔浸透作用を利用するものなどを用いればよい。 Next, the secondary removal treated water is introduced into the oil removing device 5, and an oil adsorbent containing magnetite is added thereto from the adsorbent supply device 8. The added oil adsorbent comes into contact with the oil in the secondary removal treated water, and the oil is adsorbed on the oil adsorbent, thereby removing the oil from the water to be treated. The oil adsorbent used here may be a known technique such as a form in which a magnetic material such as magnetite is used as a core, and the surface and structure can be adsorbed with oil. What uses the pore penetration effect | action by the granulated material of a fine particle should just be used.

また、油分除去装置５は、油分吸着剤が油分を吸着するために十分な処理時間と接触混合が図れる構成とすればよく、たとえば攪拌混合槽や、ラインミキサー形状など、処理形態に併せた構成とすればよいが、油分除去装置５の内部で油分吸着剤が蓄積などにより、該油分除去装置５からの排出が抑制されないよう構成することがより望ましい。油分が吸着した使用済み油分吸着剤は、ラインＬ４を通って吸着剤回収装置６に送られ、吸着剤回収装置６へと供給される。 Further, the oil removing device 5 may be configured to allow sufficient processing time and contact mixing for the oil adsorbent to adsorb the oil. For example, a configuration combined with a processing mode such as a stirring and mixing tank or a line mixer shape. However, it is more desirable that the oil removing device 5 is configured not to suppress discharge from the oil removing device 5 due to accumulation of the oil adsorbent in the oil removing device 5 or the like. The used oil adsorbent with the oil adsorbed is sent to the adsorbent recovery device 6 through the line L4 and supplied to the adsorbent recovery device 6.

ここで、吸着剤回収装置６には、重力の作用を利用して固形分を分離除去する沈殿槽、または比重差を利用して固形分を遠心分離する液体サイクロンを用いることができる。液体サイクロンを用いると、より省スペース化が図られるが、吸着剤回収装置６へ供給される液流量変動を抑制できるよう、前段に貯槽を設けるなど規定流量以下での油分吸着処理水の供給を抑制する制御装置などを設けることがより望ましい。また、吸着剤回収装置６から排出される回収吸着剤を間欠排出するプロセスを採用する場合は、固形分除去前処理装置３を並列配置し、連続処理が可能な構成をとることができる。吸着剤回収装置６から排出される被処理水は、処理水磁気分離装置７に供給され、処理水磁気分離装置７により被処理水中に残存する吸着剤が除去される。 Here, the adsorbent recovery device 6 can be a sedimentation tank that separates and removes solids using the action of gravity, or a liquid cyclone that centrifuges solids using a specific gravity difference. If a hydrocyclone is used, more space can be saved, but supply of oil-adsorbed treated water at a specified flow rate or lower, such as by providing a storage tank in the previous stage, so that fluctuations in the flow rate of the liquid supplied to the adsorbent recovery device 6 can be suppressed. It is more desirable to provide a control device or the like to suppress. Moreover, when employ | adopting the process which discharges | recovers the collection | recovery adsorption agent discharged | emitted from the adsorption agent collection | recovery apparatus 6 intermittently, the solid content removal pre-processing apparatus 3 can be arranged in parallel and the structure which can be continuously processed can be taken. The treated water discharged from the adsorbent recovery device 6 is supplied to the treated water magnetic separation device 7, and the adsorbent remaining in the treated water is removed by the treated water magnetic separation device 7.

本実施形態によれば、被処理水中の固形分や磁性固形分を固形分除去前処理装置３および磁気分離前処理装置４によって除去した後に、マグネタイトを含有する油分吸着剤による被処理水中の油分を吸着除去するため、油分吸着済みの油分吸着剤を吸着剤回収装置６および処理水磁気分離装置７により回収する際に、被処理水中の固形分や磁性固形分が混在して回収することを抑制できるため、不純物を抑制して油分回収体として処理システムから分離できるため、効率よく水質浄化し、回収油分を再利用できる。 According to this embodiment, after removing solids and magnetic solids in the water to be treated by the solids removal pretreatment device 3 and the magnetic separation pretreatment device 4, the oil content in the water to be treated by the oil adsorbent containing magnetite. When the oil adsorbent that has been adsorbed with oil is recovered by the adsorbent recovery device 6 and the treated water magnetic separator 7, the solid content and magnetic solid content in the water to be treated are mixed and recovered. Since it can suppress and can isolate | separate from a processing system as an oil recovery body by suppressing an impurity, water quality purification can be carried out efficiently and recovered oil can be reused.

（第２の実施形態）
図２を参照して本発明の第２の実施形態を説明する。なお、本実施形態が上記の実施形態と共通する部分の説明は省略する。 (Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

本実施形態の水処理システム１Ａは、油分を吸着した使用済み油分吸着剤から油分を分離抽出する油分回収装置９および油分を分離した油分吸着剤を油分回収装置９から吸着剤供給装置８を経由して油分除去装置５へ戻すリターンラインＬ７１をさらに備えている。 The water treatment system 1A of the present embodiment includes an oil recovery unit 9 that separates and extracts oil from a used oil adsorbent that has adsorbed oil, and an oil adsorbent that has separated the oil from the oil recovery unit 9 via an adsorbent supply unit 8. Then, a return line L71 for returning to the oil removing device 5 is further provided.

油分回収装置９は、入口側が吸着剤回収装置６の下部排出ラインＬ５２に接続され、第１の排出口が下部ドレインラインＬ７２に接続され、第２の排出口が上記リターンラインＬ７１に接続されている。 The oil recovery device 9 has an inlet side connected to the lower discharge line L52 of the adsorbent recovery device 6, a first discharge port connected to the lower drain line L72, and a second discharge port connected to the return line L71. Yes.

本実施形態において、油分吸着剤は、吸着剤回収装置６→ラインＬ５２→油分回収装置９→リターンラインＬ７１→吸着剤供給装置８→油分除去装置５→ラインＬ４→吸着剤回収装置６からなる循環回路を通って利用、回収、再利用される。 In the present embodiment, the oil adsorbent circulates as follows: adsorbent recovery device 6 → line L52 → oil content recovery device 9 → return line L71 → adsorbent supply device 8 → oil removal device 5 → line L4 → adsorbent recovery device 6. Used, recovered and reused through the circuit.

油分を吸着した回収吸着剤は、油分回収装置９にて、吸着した油分と、使用した吸着剤に分離される。ここで油分回収装置９とは、例えばアルコールや、飽和炭化水素、超臨界二酸化炭素、水蒸気などで回収吸着剤からの油分除去処理や、吸着剤から除去した油分と、除去処理に使用する媒体と除去油分の分離処理などが行われるが、ここで使用する媒体とは、回収油分との分離が容易であることや、精製再利用できる媒体を使用することが望ましい。油分回収装置９から排出される再生油分吸着剤は、再び油分吸着剤供給装置８に供給され、被処理水中の油分除去に利用される。また、回収油分は、被処理水１の発生源（図示なし）での再利用や、熱エネルギー媒体等に利用されることが望ましい。 The recovered adsorbent adsorbing the oil is separated into the adsorbed oil and the adsorbent used by the oil recovery device 9. Here, the oil recovery device 9 is, for example, an oil removal process from a recovered adsorbent with alcohol, saturated hydrocarbon, supercritical carbon dioxide, water vapor, or the like, an oil removed from the adsorbent, and a medium used for the removal process. Separation of the removed oil is performed, and it is desirable to use a medium that can be easily separated from the recovered oil and that can be refined and reused. The regenerated oil adsorbent discharged from the oil recovery device 9 is supplied again to the oil adsorbent supply device 8 and used for oil removal in the water to be treated. Further, it is desirable that the recovered oil is reused at a generation source (not shown) of the water 1 to be treated or used as a thermal energy medium.

本実施の形態によれば、被処理水１中の固形分や磁性固形分を排して油分を吸着除去するため、固形分や磁性固形分等の不純物を含まない状態で被処理水中の油分と油分吸着剤を選択的に分別して、効率よく油分や油分吸着剤を再利用できる。 According to the present embodiment, since the solid content and magnetic solid content in the treated water 1 are discharged and the oil content is removed by adsorption, the oil content in the treated water is free of impurities such as the solid content and magnetic solid content. The oil adsorbent and the oil adsorbent can be efficiently separated and reused efficiently.

（第３の実施形態）
図３を参照して本発明の第２の実施形態を説明する。なお、本実施形態が上記の実施形態と共通する部分の説明は省略する。 (Third embodiment)
A second embodiment of the present invention will be described with reference to FIG. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

本実施形態の水処理システム１Ｂは、吸着剤回収装置７から排出される油分除去後の処理水を貯留する処理水貯槽１０と、処理水貯槽１０から磁気分離前処理装置４までの間に設けられ、処理水貯槽１０の処理水を逆洗浄水として磁気分離前処理装置に供給するためのラインＬ３１と、処理水貯槽１０から吸着剤回収装置７までの間に設けられ、処理水貯槽の処理水を逆洗浄水として吸着剤回収装置７に供給するためのラインＬ６１と、処理水貯槽１０から吸着剤供給装置８を経由して油分除去装置５までの間に設けられ、処理水貯槽１０の処理水を油分吸着剤に添加混合して混合スラリーを生成するためのラインＬ９と、をさらに備えている。 The water treatment system 1B of the present embodiment is provided between the treated water storage tank 10 for storing treated water after oil removal discharged from the adsorbent recovery device 7 and the treated water storage tank 10 to the magnetic separation pretreatment device 4. Is provided between the line L31 for supplying the treated water in the treated water storage tank 10 to the magnetic separation pretreatment apparatus as backwash water and the treated water storage tank 10 to the adsorbent recovery device 7 to treat the treated water storage tank. A line L61 for supplying water as backwash water to the adsorbent recovery device 7 and a line between the treated water storage tank 10 and the oil removing device 5 via the adsorbent supply device 8 are provided. And a line L9 for adding and mixing the treated water to the oil adsorbent to generate a mixed slurry.

油分を含有する被処理水では、原水槽２にて、その排除のため、界面活性剤等を利用し、その油分を洗浄するなどの措置が施され、すなわち被処理水中にはその成分を含有する。このため処理水中には、この成分が含まれる。また、水処理システム運用時の水資源有効活用の観点から、より再利用に適した系内の水循環利用することが望ましい。処理水貯槽１０に保持される水は、油分や固形分を排した処理水に由来するため、本実施形態の水処理システム１Ｂで利用する洗浄等に運用する水としては、十分な性状まで処理される。 In the treated water containing oil, in the raw water tank 2, in order to eliminate it, measures such as washing the oil using a surfactant or the like are taken, that is, the component is contained in the treated water. To do. For this reason, this component is contained in treated water. In addition, from the viewpoint of effective utilization of water resources during water treatment system operation, it is desirable to use water circulation in the system that is more suitable for reuse. Since the water retained in the treated water storage tank 10 is derived from treated water from which oil and solids have been removed, it is treated to sufficient properties as water used for cleaning and the like used in the water treatment system 1B of this embodiment. Is done.

本実施形態によれば、処理水に由来する処理水貯槽１０の水を、ラインＬ３１を介して磁気分離前処理装置４に逆洗浄水として利用することにより、系内の水をリサイクルし、水処理システム形内での水を有効活用することができる。 According to this embodiment, the water in the system is recycled by using the water in the treated water storage tank 10 derived from the treated water as the backwash water in the magnetic separation pretreatment device 4 via the line L31. Water in the treatment system can be used effectively.

また、本実施形態によれば、被処理水に界面活性剤等が含まれる場合、疎水性成分である油分や、疎水性機能を有する油分吸着剤が部分保持される磁気分離前処理装置４や処理水磁気分離装置７の洗浄に利用することで、新たな薬品成分等を添加することなく効果的に洗浄できるため、既存技術からなる、本水処理システム後段（図示なし）に配される水処理システムへの新たな環境負荷を与えずに、運用することができる。 In addition, according to the present embodiment, when the water to be treated contains a surfactant or the like, the magnetic separation pretreatment device 4 in which the oil component which is a hydrophobic component or the oil adsorbent having a hydrophobic function is partially retained, Since it can be effectively washed without adding new chemical components by using it for washing of the treated water magnetic separation device 7, the water disposed in the latter stage of the water treatment system (not shown) made of existing technology. It can be operated without giving a new environmental load to the processing system.

また、本実施形態によれば、処理水貯槽１０からラインＬ９を通って吸着剤供給装置８に処理水を供給することにより、吸着剤供給装置８から供給される油分吸着剤に処理水を混合し、混合スラリーの形態で油分除去装置５に供給することで、粉体である油分吸着剤が気体を包含し浮遊することを抑制し、被処理水との接触が促進されるとともに、系内の水をリサイクルし有効活用することができる。 Moreover, according to this embodiment, treated water is mixed with the oil component adsorbent supplied from the adsorbent supply apparatus 8 by supplying treated water from the treated water storage tank 10 to the adsorbent supply apparatus 8 through the line L9. Then, by supplying to the oil removing device 5 in the form of a mixed slurry, the oil adsorbent as a powder is prevented from containing and floating, and the contact with the water to be treated is promoted. Water can be recycled and used effectively.

本実施形態によれば、被処理水を処理した処理水を系内で再利用することにより、油分回収による水利用量の増大を抑制し、環境負荷の小さい水質浄化と油分回収ができる。 According to this embodiment, by reusing treated water obtained by treating treated water in the system, an increase in the amount of water used due to oil recovery can be suppressed, and water quality purification and oil recovery with a small environmental load can be performed.

（第４の実施形態）
図４を参照して本発明の第４の実施形態を説明する。なお、本実施形態が上記の実施形態と共通する部分の説明は省略する。 (Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

本実施形態の水処理システム１Ｃは、切替弁Ｖ１，Ｖ２を有するラインＬ２３，Ｌ２４，Ｌ３３，Ｌ３４で接続された２つの磁気分離前処理装置４１，４２および２つの吸着剤回収装置６１，６２を備えている。ラインＬ３１，Ｌ３２は第１の磁気分離前処理装置４１の逆洗浄ラインであり、ラインＬ３５，Ｌ３６は第２の磁気分離前処理装置４２の逆洗浄ラインである。 The water treatment system 1C of the present embodiment includes two magnetic separation pretreatment devices 41, 42 and two adsorbent recovery devices 61, 62 connected by lines L23, L24, L33, L34 having switching valves V1, V2. I have. Lines L31 and L32 are backwash lines of the first magnetic separation pretreatment apparatus 41, and lines L35 and L36 are backwash lines of the second magnetic separation pretreatment apparatus 42.

本実施形態によれば、運転と休止を交互に繰り返すローテーション稼動を実施することが可能になり、水処理システム全体を停止させることなく、一部の前処理装置４１（又は４２）のみを部分的に休止させて逆洗浄することができる。 According to the present embodiment, it is possible to perform a rotation operation that alternately repeats operation and suspension, and only a part of the pretreatment devices 41 (or 42) is partially stopped without stopping the entire water treatment system. It is possible to perform back washing after being stopped.

また、本実施形態によれば、運転と休止を交互に繰り返すローテーション稼動を実施することが可能になり、水処理システム全体を停止させることなく、一部の吸着剤回収装置のみを部分的に休止させて逆洗浄することができる。 In addition, according to the present embodiment, it is possible to perform a rotation operation that alternately repeats operation and suspension, and only a part of the adsorbent recovery device is partially suspended without stopping the entire water treatment system. Can be backwashed.

１，１Ａ，１Ｂ，１Ｃ…水処理システム、
２…原水槽、
３…固形分除去前処理装置、
４，４１，４２…磁気分離前処理装置、
４ａ，７ａ…網状構造体（メッシュ）、４ｂ，７ｂ…磁気コイル、
５…油分除去装置、
６，６１，６２…液体サイクロン（吸着剤回収装置）、
７…処理水磁気分離装置（吸着剤回収装置）、
８…吸着剤供給装置、９…油分回収装置、１０…処理水貯槽、
Ｌ１〜Ｌ９…ライン（経路）、Ｌ31，Ｌ32，Ｌ35，Ｌ36，Ｌ61，Ｌ62…逆洗浄ライン、Ｐ１〜Ｐ９…ポンプ、Ｖ１，Ｖ２…切替弁。 1, 1A, 1B, 1C ... water treatment system,
2 ... Raw water tank,
3 ... Solid content removal pretreatment device,
4, 41, 42 ... Magnetic separation pretreatment device,
4a, 7a ... network structure (mesh), 4b, 7b ... magnetic coil,
5 ... Oil removing device,
6, 61, 62 ... liquid cyclone (adsorbent recovery device),
7 ... treated water magnetic separation device (adsorbent recovery device),
8 ... Adsorbent supply device, 9 ... Oil recovery device, 10 ... Treated water storage tank,
L1-L9 ... line (path), L31, L32, L35, L36, L61, L62 ... reverse cleaning line, P1-P9 ... pump, V1, V2 ... switching valve.

Claims

At least one of a solid content removal pretreatment device that separates and removes solids contained in the water to be treated by the action of gravity and a magnetic separation pretreatment device that separates and removes the solids contained in the water to be treated by the action of a magnetic field. Having a pretreatment device;
An oil removing device that contacts an oil adsorbent containing magnetite with the water to be treated treated by the pretreatment device, and adsorbs and separates the oil contained in the water to be treated by the oil adsorbent;
An adsorbent recovery device that separates and recovers the oil adsorbent that has adsorbed the oil from the water to be treated treated by the oil removal device;
A water treatment system comprising:

2. The water treatment system according to claim 1, further comprising an oil content recovery device that receives an oil content adsorbent adsorbing the oil content discharged from the adsorbent recovery device and separates and extracts the oil content from the oil content adsorbent.

In order to reuse the oil adsorbent provided between the oil recovery device and the oil removal device and discharged from the oil removal device in the oil removal device for oil removal of the water to be treated, the oil recovery device The water treatment system according to claim 2, further comprising a return path for returning the oil adsorbent discharged from the fuel to the oil removing device.

The water treatment system according to any one of claims 1 to 3, wherein the adsorbent recovery device is a liquid cyclone that separates the oil adsorbent from the water to be treated by centrifugal force.

The water treatment system according to any one of claims 1 to 4, wherein the adsorbent recovery device is a magnetic separation device that separates the oil adsorbent from the water to be treated by the action of a magnetic field.

The adsorbent recovery device includes a liquid cyclone that separates the oil adsorbent from the water to be treated by centrifugal force, and an oil component that is disposed on the downstream side of the liquid cyclone and is treated by the magnetic field from the water to be treated that has been treated with the liquid cyclone. The water treatment system according to claim 1, further comprising a magnetic separation device that separates the adsorbent.

The water treatment system according to any one of claims 1 to 6, wherein the pretreatment device is a hydrocyclone that separates an oil adsorbent from water to be treated by centrifugal force.

The water treatment system according to any one of claims 1 to 7, wherein a plurality of the pretreatment devices are arranged.

The water treatment system according to any one of claims 1 to 8, wherein a plurality of the adsorbent recovery devices are arranged.

A treated water storage tank for storing treated water after oil removal discharged from the adsorbent recovery device;
A path provided between the treated water storage tank and the pretreatment device, and supplying the treated water in the treated water storage tank to the pretreatment device as backwash water;
The water treatment system according to claim 1, further comprising:

A treated water storage tank for storing treated water after oil removal discharged from the adsorbent recovery device;
A path provided between the treated water storage tank and the adsorbent collecting device, and supplying the treated water in the treated water storage tank to the adsorbent collecting device as backwash water;
The water treatment system according to claim 1, further comprising:

An adsorbent supply device for supplying the oil adsorbent to the oil removal device;
A treated water storage tank for storing treated water after oil removal discharged from the adsorbent recovery device;
Provided between the treated water storage tank and the adsorbent supply device, and a path for adding and mixing the treated water of the treated water storage tank to the oil adsorbent to generate a mixed slurry;
The water treatment system according to claim 1, further comprising: