JP2012106213A - Treatment method of final remaining organic substance in drainage - Google Patents
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Abstract
【課題】排水中に最終的な残物として残存するナノレベルの有機系微小固体物質を効果的に除去する方法を提供する。
【解決手段】有機物系微小固体物質を含むＣＯＤが１０００ｍｇ／Ｌ以上の排水に対して、前記排水中で、気体が内在した直径が１０〜５０μｍのマイクロバブルを発生させる工程と、物理的刺激を与えて前記排水中の前記マイクロバブルの一部を圧壊させ、直径が５０〜５００ｎｍのナノバブルを発生させる工程と、前記ナノバブルを含む前記排水を、流速０．１〜１０ｃｍ／分で活性炭槽に通過させる工程と、前記活性炭槽を逆洗する工程とを具備する排水中の最終残存有機物処理方法であって、前記活性炭槽が、前記ナノバブルと、前記有機物系微小固体物質との化学反応の場となり、前記微小固体物質が処理され、前記排水中のＣＯＤが原水の１／５以下になる。
【選択図】図２The present invention provides a method for effectively removing nano-level organic fine solid substances remaining as final residues in waste water.
A step of generating microbubbles having a diameter of 10 to 50 μm in which gas is contained in the wastewater having a COD of 1000 mg / L or more containing an organic fine solid substance, and physical stimulation. And crushing part of the microbubbles in the wastewater to generate nanobubbles having a diameter of 50 to 500 nm, and passing the wastewater containing the nanobubbles through an activated carbon tank at a flow rate of 0.1 to 10 cm / min. And a method of treating the final residual organic matter in the wastewater comprising a step of backwashing the activated carbon tank, wherein the activated carbon tank serves as a place for a chemical reaction between the nanobubbles and the organic micro solid material. The fine solid substance is processed, and the COD in the waste water becomes 1/5 or less of the raw water.
[Selection] Figure 2
Description
本発明は、マイクロバブルの圧壊及び活性炭を使用した排水中の最終残存有機物処理方法に関するものである。 The present invention relates to a method for treating final residual organic matter in waste water using crushing of microbubbles and activated carbon.
産業排水、農業排水及び生活排水等における、排水処理の目的の１つは、排水中の微生物類やフェノールなどの有害物質から成る有機物成分を低減させることである。 One of the purposes of wastewater treatment in industrial wastewater, agricultural wastewater, domestic wastewater and the like is to reduce organic components composed of harmful substances such as microorganisms and phenol in the wastewater.
上記目的において、例えば特許第４３７８５４３号公報（特許文献１）に開示されているようなマイクロバブル（直径が５０μｍ以下の気泡のことを言う。）の圧壊（消滅）技術が非常に有効である。特許文献１に記載の方法によれば、マイクロバブル圧壊時に発生する大量のフリーラジカルが有機物を酸化分解し、また、前記圧壊過程において、溶解有機物が金属イオンなどを結びつくことで固体として析出する。これらを凝集沈殿などにより分離することで、排水中の有機物成分が効率的に低減される。また、球体としての形状の維持やイオン濃度の高まり方によっては、ナノバブル（直径がナノメートルオーダーの気泡）として残存性をもたらす（例えば、本件明細書で「特許文献２」として記載する特許第４１４４６６９号公報を参照のこと）。一方、溶解有機物濃度の高まり自体は基本的には意味のある現象につながるものではない。ところが同時に高まったイオン濃度と消滅時に発生するフリーラジカルの影響下においては、この溶解有機物が関与して様々な化学反応が生じる。その結果として溶解有機物が固体、すなわち有機物系微小固体物質として析出することが起こり得る。この現象は排水処理として有効な手段をもたらし得るが、状況によっては処理を非常に困難なものにする。すなわち生成後の静電気的な表面条件などによっては、凝集剤などを併用することにより、これらを沈殿や泡沫により排水から分離除去が可能である。 For the above purpose, for example, a crushing (extinguishing) technique of microbubbles (referring to bubbles having a diameter of 50 μm or less) as disclosed in Japanese Patent No. 4378543 (Patent Document 1) is very effective. According to the method described in Patent Document 1, a large amount of free radicals generated at the time of crushing microbubbles oxidatively decomposes organic matter, and in the crushing process, dissolved organic matter precipitates as a solid by combining metal ions and the like. By separating them by agglomeration precipitation or the like, the organic component in the waste water is efficiently reduced. Further, depending on how the shape of the sphere is maintained and how the ion concentration is increased, nanobubbles (bubbles having a diameter on the order of nanometers) are brought about to remain (for example, Japanese Patent No. 4144669 described as “Patent Document 2” in this specification). No. publication). On the other hand, the increase in dissolved organic matter concentration itself does not basically lead to a meaningful phenomenon. However, under the influence of the increased ion concentration and free radicals generated upon annihilation, this dissolved organic matter is involved and various chemical reactions occur. As a result, the dissolved organic matter may be precipitated as a solid, that is, an organic fine solid material. This phenomenon can provide an effective means for wastewater treatment, but in some situations makes the treatment very difficult. In other words, depending on the electrostatic surface conditions after the production, it is possible to separate and remove these from the wastewater by precipitation or foam by using a coagulant or the like together.
ところが生成した有機物系微小固体物質は、その物質（粒子）の形状によっては、直径がナノメートルオーダーとあまりにも小さく、なおかつ粒子同士に静電的な反発力が強く働く場合には浮遊微粒子として処理水中に残存してしまう。これらは微小な有機物の塊であり、場合によってはその内部に気体を伴うこともあり得る。その気体の特徴としてはマイクロバブルの圧壊過程で生じたものであるため、これ自体を特許文献１に記載されているマイクロバブルの圧壊方法を用いて、分解処理しようとしてもその効率は極めて悪い。また溶解有機物ではないが、十分に小さな物体であるため液体とともに挙動してＢＯＤ（生物化学的酸素要求量）やＣＯＤ（化学的酸素要求量）などの有機成分として測定され得る。 However, the generated organic micro solid material is treated as suspended fine particles when its diameter is too small, on the order of nanometers, depending on the shape of the material (particle), and the electrostatic repulsion between the particles is strong. It remains in the water. These are lumps of minute organic matter, and in some cases, a gas may accompany them. Since the gas is generated during the crushing process of the microbubbles, the efficiency of the gas itself is extremely poor even if it is attempted to be decomposed using the microbubble crushing method described in Patent Document 1. Moreover, although it is not a dissolved organic substance, it is a sufficiently small object and can be measured as an organic component such as BOD (biochemical oxygen demand) and COD (chemical oxygen demand) because it behaves with the liquid.
このことが原因のひとつとなって、排水をマイクロバブルの圧壊処理した場合に、処理が進むほど、すなわち排水自体が清浄化するほど、最終的に残存した有機物系微小固体物質の低減が困難であった。 This is one of the causes, and when the wastewater is crushed by microbubbles, the more the treatment proceeds, that is, the cleaner the wastewater itself, the more difficult it is to reduce the remaining organic micro solid substances. there were.
マイクロバブルの圧壊は有機系排水の処理技術として非常に優れたものであるが、処理の結果としてナノレベル（粒径がナノメートルオーダー）の有機物系微小固体物質を発生させる。これが最終的な残物として処理水中に残存するため初期値に対してＣＯＤとして数％程度が残存してしまう。 Although the collapse of microbubbles is very excellent as a treatment technique for organic wastewater, as a result of the treatment, a nano-level (particle size is on the order of nanometers) organic matter-based solid material is generated. Since this remains in the treated water as a final residue, about several percent of COD remains with respect to the initial value.
本発明は上述したような実情に鑑みてなされたものであり、排水中に最終的な残物として残存するナノレベルの有機物系微小固体物質を効果的に除去する方法を提供することを目的とする。 The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a method for effectively removing nano-level organic micro solid substances remaining as final residues in waste water. To do.
本発明の上記目的は、有機物系微小固体物質を含むＣＯＤが１０００ｍｇ／Ｌ以上の排水に対して、前記排水中で、気体が内在した直径が１０〜５０μｍのマイクロバブルを発生させる工程と、物理的刺激を与えて前記排水中の前記マイクロバブルの一部を圧壊させ、直径が５０〜５００ｎｍのナノバブルを発生させる工程と、前記ナノバブルを含む前記排水を、流速０．１〜１０ｃｍ／分で活性炭槽に通過させる工程と、前記活性炭槽を逆洗する工程とを具備する排水中の最終残存有機物処理方法であって、前記活性炭槽が、前記ナノバブルと、前記有機物系微小固体物質との化学反応の場となり、前記微小固体物質が処理され、前記排水中のＣＯＤが原水の１／５以下になることにより、効果的に達成される。 The object of the present invention is to generate a microbubble having a diameter of 10 to 50 μm in which a gas is contained in the wastewater with respect to a wastewater having a COD of 1000 mg / L or more containing an organic fine solid substance, A step of crushing a part of the microbubbles in the wastewater by generating a mechanical stimulus to generate nanobubbles having a diameter of 50 to 500 nm, and the wastewater containing the nanobubbles at a flow rate of 0.1 to 10 cm / min. A final residual organic matter treatment method in waste water comprising a step of passing through a tank and a step of backwashing the activated carbon tank, wherein the activated carbon tank is a chemical reaction between the nanobubbles and the organic micro solid material. This is effectively achieved by treating the fine solid material and reducing the COD in the waste water to 1/5 or less of the raw water.
また、本発明は、前記気体がオゾンであることにより、或いは前記物理的刺激が、循環量１０〜１００Ｌ／分で前記マイクロバブルを含む排水を循環させながら、前記マイクロバブルを含む排水をパンチング板に通すことであることにより、或いは前記物理的刺激が、発振周波数が２０〜１０００ｋＨｚの超音波を照射することであるにより、或いは前記物理的刺激が、電圧が２０００〜３０００Ｖの放電を使用することであるにより、或いは前記ナノバブルは、半減期が１０分以上であることにより、或いは前記活性炭槽は、粒径が１〜３ｍｍの粒状活性炭を、１０〜３０ｃｍの厚さの層となるように容器に充填したものであることにより、或いは前記活性炭が、触媒として使用されるにより、より効果的に達成される。 Further, the present invention provides a punching plate for drainage containing the microbubbles while the gas is ozone or the physical stimulus circulates drainage containing the microbubbles at a circulation rate of 10 to 100 L / min. Or the physical stimulus is by irradiating an ultrasonic wave with an oscillation frequency of 20 to 1000 kHz, or the physical stimulus uses a discharge with a voltage of 2000 to 3000V. Or the nanobubbles have a half-life of 10 minutes or more, or the activated carbon tank is a container of granular activated carbon having a particle size of 1 to 3 mm in a layer having a thickness of 10 to 30 cm. It is achieved more effectively by being filled in or by using the activated carbon as a catalyst.
本発明の方法によれば、ナノバブルを排水に作用させ、活性炭を化学反応の場、即ち触媒として利用することにより、排水中の残存有機物（ナノレベル）を分解除去することが可能となった。また、ＣＯＤが１／５程度に減少した。 According to the method of the present invention, it is possible to decompose and remove residual organic substances (nano level) in waste water by allowing nano bubbles to act on waste water and using activated carbon as a field of chemical reaction, that is, as a catalyst. Moreover, COD decreased to about 1/5.
また、本発明の方法は、ありとあらゆる種類の有機物に対して有効である。 The method of the present invention is effective for all kinds of organic substances.
以下、本発明に係る排水中の最終残存有機物処理方法の実施形態を説明する。なお、本発明は以下の実施形態に限定されるものではない。 Hereinafter, an embodiment of a method for treating a final residual organic matter in waste water according to the present invention will be described. In addition, this invention is not limited to the following embodiment.
先ず、本発明に係る排水中の最終残存有機物処理方法にて使用する有機物処理装置の概要を説明する。 First, an outline of an organic matter processing apparatus used in the final residual organic matter processing method in waste water according to the present invention will be described.
図１は、前記有機物処理装置の概略図である。図１に示すように、有機物処理装置１は、処理槽２内部にマイクロバブル発生装置３が設置され、処理槽２の側面に、循環ポンプ４及びパンチング板（多孔板）５が備え付けられている循環パイプ６と、もう一方の側面に、循環ポンプ７及び活性炭槽８が備え付けられている循環パイプ９が設置されて成る。
FIG. 1 is a schematic view of the organic matter processing apparatus. As shown in FIG. 1, the organic matter processing apparatus 1 is provided with a
ここで、マイクロバブル発生装置３のタイプは限定されないが、シャフトタイプのものが望ましい。ちなみにマイクロバブル発生装置３の設置台数は特に限定はない。
Here, the type of the
また、図１では処理槽２の側面に、循環ポンプ４及びパンチング板５が備え付けられている循環パイプ６が設置されているが、これらは無くても構わない（理由は後述）。 In FIG. 1, the circulation pipe 6 provided with the circulation pump 4 and the punching plate 5 is installed on the side surface of the treatment tank 2, but these may be omitted (the reason will be described later).
また、活性炭槽８については、容器に粒径が１〜３ｃｍ程度の粒状活性炭を、層の厚さが１０〜３０ｃｍとなるように充填すれば良いが、容器の形状については、活性炭層の厚さを確保できれば良いので特に限りではない。 Moreover, about the activated carbon tank 8, what is necessary is just to fill the container with granular activated carbon having a particle size of about 1 to 3 cm so that the thickness of the layer is 10 to 30 cm. It is not particularly limited as long as it can be secured.
次に、本発明に係る排水中の有機物の処理方法を図１の有機物処理装置及び図２のフローチャートを基に説明する。 Next, a method for treating organic matter in waste water according to the present invention will be described based on the organic matter treating apparatus in FIG. 1 and the flowchart in FIG.
先ず、処理槽２に処理する原水（排水）を導入し、その後、マイクロバブル発生装置３にてマイクロバブルを発生させる（ステップＳ１）。また、該マイクロバブル内部に介在させる気体、即ちマイクロバブル発生装置３に吸入させる気体は、オゾンが好ましいが、酸素、窒素、希ガス類及び空気等といった気体でも構わない。
First, raw water (drainage) to be treated is introduced into the treatment tank 2, and then microbubbles are generated by the microbubble generator 3 (step S1). The gas interposed inside the microbubble, that is, the gas sucked into the
次に、循環ポンプ４を使用して、マイクロバブルを含んだ原水（以下、マイクロバブル含有原水と記す。）を循環パイプ７内に循環させ（循環経路は、図１に示す矢印Ａ，Ｂを参照）、前記マイクロバブル含有原水を処理槽２に戻す手前でパンチング板５に通過させる（ステップＳ２）。マイクロバブル含有原水を循環パイプ６内にて循環させる際の循環量は、１０〜１００Ｌ／分が望ましい。また、循環ポンプ６の押し出し圧力は０．１〜０．３ＭＰａが望ましい。ちなみに前記循環量及び前記押し出し圧力について、これらの範囲以下であると、圧壊が十分にされず、範囲以上であっても効率はさほど上がらない。 Next, using the circulation pump 4, raw water containing microbubbles (hereinafter referred to as microbubble-containing raw water) is circulated in the circulation pipe 7 (circulation paths are indicated by arrows A and B shown in FIG. 1). Reference), the microbubble-containing raw water is passed through the punching plate 5 before returning to the treatment tank 2 (step S2). The circulating amount when the microbubble-containing raw water is circulated in the circulation pipe 6 is preferably 10 to 100 L / min. The extrusion pressure of the circulation pump 6 is preferably 0.1 to 0.3 MPa. Incidentally, if the circulation amount and the extrusion pressure are below these ranges, the crushing is not sufficient, and even if it is above the range, the efficiency does not increase so much.
ここで、上記有機物処理装置には循環ポンプ４及びパンチング板５が備え付けられている循環パイプ６が設置されなくても良いと上述したが、そもそも、パンチング板５に通過させる理由は、マイクロバブルを圧壊させるための物理的刺激として使用するためのものであり、この物理的刺激は、超音波照射、放電でも可能である。なお、超音波照射を物理的刺激として使用する場合は、発振周波数が２０〜１０００ｋ（１Ｍ）Ｈｚのものが使用可能であり、放電を使用する場合は２０００〜３０００Ｖのものが使用可能である。これらマイクロバブルを圧壊させることによって、マイクロバブルの一部がｎｍオーダーの粒径を有する気泡（ナノバブル）となる。ちなみに、本発明の方法で用いるナノバブルの直径は５０〜５００ｎｍ（中心平均粒径分布が約１５０ｎｍ）また、ナノバブル内部に内在する気体は、マイクロバブル内部に内在する気体と同一である。 Here, it has been described above that the organic material processing apparatus does not have to be provided with the circulation pipe 6 provided with the circulation pump 4 and the punching plate 5. It is intended to be used as a physical stimulus for crushing, and this physical stimulus can be performed by ultrasonic irradiation or electric discharge. In addition, when using ultrasonic irradiation as a physical stimulus, the thing with an oscillation frequency of 20-1000k (1M) Hz can be used, and when using discharge, the thing of 2000-3000V can be used. By crushing these microbubbles, some of the microbubbles become bubbles (nanobubbles) having a particle size in the order of nm. Incidentally, the diameter of the nanobubbles used in the method of the present invention is 50 to 500 nm (central average particle size distribution is about 150 nm), and the gas inside the nanobubbles is the same as the gas inside the microbubbles.
次に、マイクロバブルの一部がナノバブルとなった排水を循環ポンプ７及び活性炭槽８が備え付けられている循環パイプ９内で循環させる（ステップＳ３。なお循環経路は、図１に示す矢印Ｃ，Ｄを参照）。ちなみに循環パイプ９内にて循環させる際の循環量は、１０〜１００Ｌ／分が望ましい。また、循環ポンプ９の押し出し圧力は０．１〜０．３ＭＰａが望ましい。 Next, the wastewater in which some of the microbubbles become nanobubbles is circulated in the circulation pipe 9 provided with the circulation pump 7 and the activated carbon tank 8 (step S3. Note that the circulation path is indicated by arrows C, See D). Incidentally, the circulation amount when circulating in the circulation pipe 9 is preferably 10 to 100 L / min. The extrusion pressure of the circulation pump 9 is preferably 0.1 to 0.3 MPa.
また、活性炭槽８については前述のように容器に粒径が１〜３ｍｍの粒状活性炭を１０ｃｍから３０ｃｍ程度の厚さで満たし、前記排水を流速０．１〜１０ｃｍ／分の速度で通過させる。通常の排水中には有機物の他に、ミネラル類などの電解質イオン類が含まれている。例えばオゾンを利用した場合、排水処理工程の後半部において半減期として数十分程度以上の持続時間を持ってオゾン気泡が残存する。この様なオゾン気泡を存在させた条件で活性炭槽８のような活性炭層に通過させるとオゾンに対しての活性炭の触媒作用と流動に伴う圧変動が加味されてオゾン気泡を強力に分解する。特に活性炭表面では多くの微細孔があり、そこに順次にトラップされながら分解されるが、この現場には同時に有機物微粒子もトラップされる。その結果、オゾン分解に伴って発生する水酸基ラジカルが近傍の有機物に直接的に作用する状況が形成される。水酸基ラジカルは水中においてもっとも酸化能力の高い物質のひとつであり、ほぼ全ての有機物を分解することが可能である。これにより極めて効率的に微粒子状の有機物を酸化分解していく。この作用により処理水中の有機物濃度を急速に低減することが可能である。なお、活性炭は吸着剤としての作用があり、溶解有機物や微粒子状有機物を一時的にトラップする作用を持っている。しかし、このメカニズムでは有機物は分解されないため、時間が経過すると活性炭の微細孔が塞がっていき、ついには有機物を保持できなくなる。すなわち破過という現象が起こる。一方、本発明では活性炭表面を化学反応の場（触媒）として利用しているものであり、有機物は分解除去されるため、吸着現象で認められるような活性炭の破過は生じない。 As for the activated carbon tank 8, as described above, the container is filled with granular activated carbon having a particle size of 1 to 3 mm with a thickness of about 10 cm to 30 cm, and the waste water is passed at a flow rate of 0.1 to 10 cm / min. Ordinary wastewater contains electrolyte ions such as minerals in addition to organic substances. For example, when ozone is used, ozone bubbles remain with a duration of several tens of minutes or more as the half-life in the latter half of the wastewater treatment process. When passing through an activated carbon layer such as the activated carbon tank 8 under such conditions that ozone bubbles exist, the ozone bubbles are strongly decomposed by taking into account the catalytic action of the activated carbon on ozone and the pressure fluctuations associated with the flow. In particular, there are many fine pores on the surface of the activated carbon, which are decomposed while being trapped in order, but organic fine particles are also trapped at this site at the same time. As a result, a situation is formed in which hydroxyl radicals generated by ozonolysis act directly on nearby organic substances. Hydroxyl radicals are one of the most oxidizing substances in water and can decompose almost all organic substances. As a result, the particulate organic matter is oxidized and decomposed very efficiently. By this action, it is possible to rapidly reduce the organic matter concentration in the treated water. Note that activated carbon has an action as an adsorbent, and has an action of temporarily trapping dissolved organic matter and particulate organic matter. However, since this mechanism does not decompose the organic matter, the fine pores of the activated carbon are blocked over time, and the organic matter cannot be retained at last. That is, the phenomenon of breakthrough occurs. On the other hand, in the present invention, the activated carbon surface is used as a chemical reaction field (catalyst), and the organic matter is decomposed and removed, so that the activated carbon breakthrough as observed in the adsorption phenomenon does not occur.
次に、活性炭槽８を水で逆洗する（ステップＳ４）。 Next, the activated carbon tank 8 is back-washed with water (step S4).
以下、ステップＳ１からステップＳ４の工程を、２０〜３０日（処理時間は、一日あたり６〜８時間程度）継続（繰り返す）ことにより、排水のＣＯＤ（化学的酸素要求量）が１０００ｍｇ／Ｌ以上のであるのが、２００ｍｇ／Ｌ以下になる。 Hereinafter, the COD (chemical oxygen demand) of the wastewater is 1000 mg / L by continuing (repeating) the process from step S1 to step S4 for 20 to 30 days (the processing time is about 6 to 8 hours per day). The above is 200 mg / L or less.
以下、本発明に係る排水中の最終残存有機物処理方法について実施例を説明する。なお、本実施例にて使用した有機物処理装置については、図１及び上記実施形態を参照されたい。 Hereinafter, an Example is described about the final residual organic-material processing method in the waste_water | drain based on this invention. For the organic matter processing apparatus used in this example, refer to FIG. 1 and the above embodiment.
［実施例１］
ＣＯＤ（化学的酸素要求量）が約５，０００ｍｇ／Ｌである原水（排水）を本実施例１で利用した。処理槽は約５００Ｌの容積を持っており、処理槽内部にシャフト型マイクロバブル発生装置（５０Ｗタイプ）を設置されている。該発生装置は、毎分約２Ｌのオゾンガスを吸引し、オゾン濃度が約３５ｇ／ｍ３である。
[Example 1]
Raw water (drainage) having a COD (chemical oxygen demand) of about 5,000 mg / L was used in Example 1. The processing tank has a volume of about 500 L, and a shaft type microbubble generator (50 W type) is installed inside the processing tank. The generator sucks about 2 L of ozone gas per minute and has an ozone concentration of about 35 g / m 3 .
処理槽には２つの付帯設備がある。１つは槽内の水に含まれるマイクロバブルに刺激を与えてこれを圧壊するとともにその一部をナノバブル化する装置である。これは循環ポンプ、パンチング板及び循環パイプより形成される。槽内の水をポンプにより吸引しており、槽に戻す前にパンチング版を通過させた。ポンプの循環量は約３０Ｌ／分であり、押し出し側の圧力は約０．１ＭＰａであった。もう一つの付帯設備は活性炭槽、循環ポンプ及び循環パイプから形成される。ポンプの循環量は約１０Ｌ／分である。活性炭槽は直径約１０ｃｍの円筒であり、粒径が約３ｍｍの粒状活性炭を約２０ｃｍの層厚で充填している。 There are two incidental facilities in the treatment tank. One is a device that stimulates microbubbles contained in the water in the tank to crush them, and at the same time converts some of them into nanobubbles. This is formed by a circulation pump, a punching plate and a circulation pipe. Water in the tank was sucked by a pump, and the punching plate was passed before returning to the tank. The circulation rate of the pump was about 30 L / min, and the pressure on the extrusion side was about 0.1 MPa. Another incidental facility is formed from an activated carbon tank, a circulation pump and a circulation pipe. The circulation rate of the pump is about 10 L / min. The activated carbon tank is a cylinder having a diameter of about 10 cm, and is filled with granular activated carbon having a particle diameter of about 3 mm with a layer thickness of about 20 cm.
本実施例では、原水の供給量を約０．１ｍ３／時として１日８時間の連続運転処理を３０日間継続した。また、活性炭槽の逆洗を水道水により１日に１度の割合で３分間実施した。その結果、処理排水中のＣＯＤは約２００ｍｇ／Ｌであった。なお、この値は試験開始時から３０日目経過した段階であってもほぼ同じであった。 In this example, the supply amount of raw water was about 0.1 m 3 / hour, and the continuous operation process for 8 hours per day was continued for 30 days. The activated carbon tank was backwashed with tap water once a day for 3 minutes. As a result, the COD in the treated waste water was about 200 mg / L. This value was almost the same even when the 30th day had passed since the start of the test.
［実施例２］
実施例１と同じ条件ながらオゾンガスの変わりに同量の窒素を入れて試験したところ処理水中のＣＯＤは約１０００ｍｇ／Ｌであった。
[Example 2]
Under the same conditions as in Example 1, when the same amount of nitrogen was added instead of ozone gas and tested, the COD in the treated water was about 1000 mg / L.
［比較例１］
実施例１と同じ原水および設備を利用して比較試験を行った。ただし、活性炭の循環ポンプを休止させて、マイクロバブルの発生装置とパンチング板の循環ポンプのみを作動させた。試験では原水を約０．１ｍ３／時で連続的に供給しながら８時間実施した。８時間経過時の処理水のＣＯＤは約３，５００ｍｇ／Ｌであった。
[Comparative Example 1]
A comparative test was conducted using the same raw water and equipment as in Example 1. However, the activated carbon circulation pump was stopped, and only the microbubble generator and the punching plate circulation pump were operated. In the test, raw water was continuously supplied at about 0.1 m 3 / hour for 8 hours. The COD of the treated water after 8 hours was about 3,500 mg / L.
［比較例２］
実施例１と同じ原水および設備を利用して比較試験を行った。ただし、マイクロバブルの発生装置とパンチング板の循環ポンプを休止させて、活性炭の循環ポンプのみを作動させた。試験では原水を約０．１ｍ３／時で連続的に供給しながら８時間実施した。８時間経過時の処理水のＣＯＤは約４，５００ｍｇ／Ｌであった。また、一度逆洗を実施した上で、次の日に同様の試験を実施したところ８時間経過後の処理水のＣＯＤは原水とほとんど変わらなかった。
[Comparative Example 2]
A comparative test was conducted using the same raw water and equipment as in Example 1. However, the microbubble generator and the punching plate circulation pump were stopped and only the activated carbon circulation pump was operated. In the test, raw water was continuously supplied at about 0.1 m 3 / hour for 8 hours. The COD of the treated water after 8 hours was about 4,500 mg / L. Moreover, after carrying out backwash once, when the same test was implemented on the next day, COD of the treated water after 8 hours passed was hardly different from raw water.
１ 有機物処理装置
２ 処理槽
３ マイクロバブル発生装置
４、７ 循環ポンプ
５ パンチング板
６、９ 循環パイプ
８ 活性炭槽
DESCRIPTION OF SYMBOLS 1 Organic substance processing apparatus 2
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