JP6635541B2 - Microorganism holding carrier, sewage treatment method, and sewage treatment system - Google Patents
Microorganism holding carrier, sewage treatment method, and sewage treatment system Download PDFInfo
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Description
本発明は、微生物保持用担体、汚水の処理方法、並びに、汚水処理システムに関し、さらに詳細には、汚水の接触酸化処理に用いる微生物保持用担体、当該微生物保持用担体を用いた汚水の処理方法、並びに当該微生物保持用担体を包含する汚水処理システムに関する。 The present invention relates to a carrier for holding microorganisms, a method for treating sewage, and a sewage treatment system, and more particularly, a carrier for holding microorganisms used for contact oxidation treatment of sewage, and a method for treating sewage using the carrier for holding microorganisms. And a sewage treatment system including the microorganism holding carrier.
汚水処理の方法として生物学的処理が広く行われている。例えば、回転円板（例えば特許文献１〜３）や流動担体（例えば特許文献４）を用いた接触酸化法による生物学的処理が行われている。接触酸化法は、生物汚泥濃度の管理が不要であり、また微生物保持量が高いので高効率で汚水を処理できるという特長を有している。
Biological treatment is widely used as a sewage treatment method. For example, biological treatment by a catalytic oxidation method using a rotating disk (for example,
上記生物学的処理においては、回転円板や流動担体等の担体上に微生物を安定的に保持させることが求められる。すなわち、微生物の脱落をできるだけ抑えて高い微生物密度を保つことにより、汚水の処理効率を高めることができる。また上記生物学的処理においては、微生物に対して酸素を十分に供給する必要がある。例えば回転円板法の場合には、微生物を保持させた回転円板を回転させて水面に衝突させることにより、酸素溶解量が増大し、十分な酸素供給が図られる。流動担体法の場合は、通気攪拌を行うことにより酸素溶解量が増大し、十分な酸素供給が図られる。 In the above biological treatment, it is required to stably hold microorganisms on a carrier such as a rotating disk or a fluid carrier. That is, by maintaining the high microorganism density while minimizing the falling off of microorganisms, the efficiency of treating wastewater can be increased. In the above biological treatment, it is necessary to supply sufficient oxygen to microorganisms. For example, in the case of the rotating disk method, the amount of oxygen dissolved is increased by rotating the rotating disk holding the microorganisms to collide with the water surface, thereby achieving sufficient oxygen supply. In the case of the fluidized carrier method, the amount of dissolved oxygen is increased by performing aeration and agitation, and sufficient oxygen supply is achieved.
しかし、上記した酸素を供給するための操作は、担体上の微生物に物理的ストレスを与える。例えば回転円板法の場合は、円板の回転速度を上げたり、微生物保持面に凹凸を設ける等の方策によって、酸素溶解量を増大させることができる。ところが、これらの方策は微生物と水面との激しい衝突を生じさせ、微生物に高い物理的ストレスを与えてしまう。その結果、回転円板から微生物が剥離してしまい、処理効率の低下を招くおそれがある。流動担体法の場合も同様であり、通気攪拌を激しく行うと、微生物に高い物理的ストレスを与え、流動担体から微生物が剥離してしまうおそれがある。このように、処理効率を上げるために回転円板の回転速度を上げたり、流動担体への通気攪拌を激しく行おうとしても、制限があるのが実情である。したがって、微生物の保持性能により優れた微生物保持用担体の開発が望まれている。 However, the operation for supplying oxygen described above exerts physical stress on the microorganisms on the carrier. For example, in the case of the rotating disk method, the amount of dissolved oxygen can be increased by increasing the rotation speed of the disk or providing irregularities on the microorganism holding surface. However, these measures cause severe collisions between the microorganisms and the water surface, and give high physical stress to the microorganisms. As a result, microorganisms may be peeled off from the rotating disk, which may cause a decrease in processing efficiency. The same applies to the case of the fluidized carrier method. If the aeration and stirring are performed vigorously, a high physical stress is applied to the microorganisms, and the microorganisms may be separated from the fluidized carrier. As described above, even if the rotational speed of the rotating disk is increased to increase the processing efficiency, or if the aeration and agitation to the fluid carrier are performed vigorously, there is a limitation in reality. Therefore, development of a carrier for holding microorganisms which is more excellent in holding performance of microorganisms is desired.
そこで本発明は、微生物の保持性能により優れた微生物保持用担体を提供するとともに、当該微生物保持用担体を用いた汚水の処理技術を提供することを目的とする。 Therefore, an object of the present invention is to provide a carrier for holding microorganisms which is more excellent in the ability to hold microorganisms, and to provide a technology for treating wastewater using the carrier for holding microorganisms.
本発明の１つの様相は、汚水の接触酸化処理に用いる微生物保持用担体であって、前記微生物保持用担体は、ポリオレフィンを主要な樹脂基材とし、平均形状が粒状の炭酸カルシウムを５〜１５重量％含有することを特徴とする微生物保持用担体である。 One aspect of the present invention is a carrier for holding microorganisms used for the catalytic oxidation treatment of sewage, wherein the carrier for holding microorganisms contains polyolefin as a main resin base material, and has an average shape of 5 to 15 particles of calcium carbonate. It is a carrier for holding microorganisms, characterized in that the carrier is contained by weight%.
本様相は汚水の接触酸化処理に用いる微生物保持用担体に係るものである。本様相の微生物保持用担体は、微生物の保持性能に優れるので、微生物が安定的に保持される。そのため、十分な酸素供給を実現すべく微生物保持用担体に高い物理的ストレスを与える操作を行っても、微生物の脱落が抑えられる。すなわち、本様相の微生物保持用担体を用いることにより、汚水の接触酸化処理において、十分な酸素供給を実現することができ、より高効率かつ安定した汚水処理が可能となる。 This aspect relates to a carrier for holding microorganisms used in the catalytic oxidation treatment of wastewater. The carrier for holding microorganisms of this aspect is excellent in holding performance of microorganisms, so that the microorganisms are stably held. Therefore, even if an operation for applying a high physical stress to the carrier for holding microorganisms is performed in order to realize a sufficient oxygen supply, falling off of the microorganisms can be suppressed. That is, by using the microorganism holding carrier of this aspect, sufficient oxygen supply can be achieved in the contact oxidation treatment of sewage, and more efficient and stable sewage treatment can be achieved.
ここでいう「平均形状」とは、散乱光方式のパーティクルカウンターを用いて検体粒子を無作為の方向から粒径測定することで得られた粒度分布の中央値±２０ｎｍの範囲を指す。また「粒状」とは、粒度分布の中央値±２０ｎｍの範囲に含まれる粒子数が検体全粒子数の７０％以上であることを指す。 Here, the “average shape” refers to a range of ± 20 nm of the median of the particle size distribution obtained by measuring the particle size of the sample particles from a random direction using a scattered light type particle counter. The term “granular” means that the number of particles included in the range of the median of the particle size distribution ± 20 nm is 70% or more of the total number of particles in the sample.
好ましくは、前記炭酸カルシウムの平均粒径が７０〜９０ｎｍである。 Preferably, the average particle size of the calcium carbonate is 70 to 90 nm.
ここでいう「平均粒径」は、散乱光方式のパーティクルカウンターにより測定した値である。なお、平均粒径の値は、測定精度を考慮して±１０％程度の幅を有するものとする。 The “average particle size” here is a value measured by a scattered light type particle counter. The value of the average particle size has a range of about ± 10% in consideration of measurement accuracy.
好ましくは、前記ポリオレフィンは、ポリエチレン又はポリプロピレンである。 Preferably, the polyolefin is polyethylene or polypropylene.
好ましくは、前記微生物保持用担体は、流動担体である。 Preferably, the carrier for holding microorganisms is a fluid carrier.
好ましくは、前記微生物保持用担体は、回転円板である。 Preferably, the carrier for holding microorganisms is a rotating disk.
本発明の他の様相は、上記の微生物保持用担体を用いる汚水の処理方法であって、微生物を保持させた前記微生物保持用担体に汚水を接触させ、前記汚水を酸化処理することを特徴とする汚水の処理方法である。 Another aspect of the present invention is a method for treating sewage using the carrier for holding microorganisms, wherein the sewage is brought into contact with the carrier for holding microorganisms holding microorganisms, and the wastewater is oxidized. Wastewater treatment method.
本様相の汚水の処理方法によれば、微生物保持用担体に保持された微生物の脱落が抑えられるので、接触酸化処理による汚水処理を高効率かつ安定的に行うことができる。 According to the method for treating sewage of this aspect, the falling off of the microorganisms held by the microorganism holding carrier can be suppressed, so that the sewage treatment by the catalytic oxidation treatment can be performed efficiently and stably.
好ましくは、前記微生物保持用担体が流動担体であり、前記流動担体を旋回させるための曝気強度が３〜６ｍ3／ｍ3・時間である。 Preferably, the carrier for holding microorganisms is a fluid carrier, and the aeration intensity for swirling the fluid carrier is 3 to 6 m 3 / m 3 · hour.
好ましくは、前記微生物保持用担体が回転円板であり、前記回転円板の回転速度が周速１５〜３０ｍ／分である。 Preferably, the carrier for holding microorganisms is a rotating disk, and the rotating speed of the rotating disk is 15 to 30 m / min.
本発明の他の様相は、上記の微生物保持用担体と、汚水が処理される汚水処理槽と、を備え、前記汚水処理槽内で前記微生物保持用担体と汚水とを接触させることが可能であることを特徴とする汚水処理システムである。 Another aspect of the present invention includes the above-described microorganism holding carrier and a sewage treatment tank in which sewage is treated, and the microorganism holding carrier and sewage can be contacted in the sewage treatment tank. It is a sewage treatment system characterized by the following.
好ましくは、汚水原水が導入される調整槽をさらに備え、接触酸化処理すべき汚水が前記調整槽から流出して前記汚水処理槽に導入されるものである。 Preferably, the apparatus further comprises a regulating tank into which raw sewage is introduced, and sewage to be subjected to contact oxidation treatment flows out of the regulating tank and is introduced into the sewage treatment tank.
好ましくは、前記調整槽に導入される汚水原水の日間平均全有機炭素濃度に対して、調整槽から流出する汚水の全有機炭素濃度を−３０％〜＋３０％に調整し、かつ調整槽における汚水原水の滞留時間を８時間以上にすることが可能である。
Preferably, the total organic carbon concentration of the sewage flowing out of the adjusting tank is adjusted to −30% to + 30% with respect to the daily average total organic carbon concentration of the raw sewage introduced into the adjusting tank, and the sewage in the adjusting tank is adjusted. It is possible to make the residence time of the
好ましくは、前記調整槽と前記汚水処理槽との間にｐＨ調整槽をさらに備え、当該ｐＨ調整槽において、前記調整槽から流出した汚水のｐＨを５．０〜９．０に調整することが可能である。 Preferably, a pH adjusting tank is further provided between the adjusting tank and the sewage treatment tank, and the pH of the sewage flowing out of the adjusting tank is adjusted to 5.0 to 9.0 in the pH adjusting tank. It is possible.
好ましくは、汚水処理槽から流出する接触酸化処理水を固液分離するための沈殿槽をさらに備える。 Preferably, the apparatus further comprises a sedimentation tank for solid-liquid separation of the contact oxidation treatment water flowing out of the sewage treatment tank.
好ましくは、前記沈殿槽から流出する沈殿槽処理水に存在する単位体積あたりの固形成分量を、前記沈殿槽に流入する接触酸化処理水に存在する単位体積あたりの固形成分量の１５％以下にすることが可能である。 Preferably, the solid component amount per unit volume present in the settling tank treated water flowing out of the settling tank is set to 15% or less of the solid component amount per unit volume present in the contact oxidation treated water flowing into the settling tank. It is possible to
本発明によれば、汚水の接触酸化処理を高効率でかつ安定して行うことができる。 ADVANTAGE OF THE INVENTION According to this invention, the contact oxidation treatment of sewage can be performed highly efficiently and stably.
本発明の微生物保持用担体は、汚水の接触酸化処理に用いる微生物保持用担体であって、ポリオレフィンを主要な樹脂基材とし、平均形状が粒状の炭酸カルシウムを５〜１５重量％含有するものである。 The carrier for holding microorganisms of the present invention is a carrier for holding microorganisms used for the catalytic oxidation treatment of sewage, and contains polyolefin as a main resin base material and contains 5 to 15% by weight of granular calcium carbonate having an average shape. is there.
本発明において「ポリオレフィンを主要な樹脂基材とする」とは、上記微生物保持用担体を構成する樹脂材料の全重量に対して、ポリオレフィンを５０重量％以上含有することを指す。ポリオレフィンの当該含有量は、好ましくは７５重量％以上、より好ましくは９０重量％以上、特に好ましくは９５〜１００重量％である。 In the present invention, “using polyolefin as a main resin substrate” means that the polyolefin is contained in an amount of 50% by weight or more based on the total weight of the resin material constituting the carrier for holding microorganisms. The content of the polyolefin is preferably 75% by weight or more, more preferably 90% by weight or more, and particularly preferably 95 to 100% by weight.
上記ポリオレフィンとしては特に限定はなく、ポリエチレン、ポリプロピレン、エチレン−プロピレン共重合体、及びこれらの複合体などの公知のものを採用することができる。好ましくは、ポリエチレン又はポリプロピレンが用いられる。 The polyolefin is not particularly limited, and known ones such as polyethylene, polypropylene, ethylene-propylene copolymer, and a composite thereof can be used. Preferably, polyethylene or polypropylene is used.
上記炭酸カルシウムは、平均形状が粒状のものである。上記したように、平均形状とは散乱光方式のパーティクルカウンターを用いて検体粒子を無作為の方向から粒径測定することで得られた粒度分布の中央値±２０nmの範囲を指し、「粒状」とは、粒度分布の中央値±２０nmの範囲に含まれる検体粒子数が検体全粒子数の７０％以上であることを指す。 The calcium carbonate has an average shape of particles. As described above, the average shape refers to the range of the median ± 20 nm of the particle size distribution obtained by measuring the particle size of the sample particles from a random direction using a scattered light particle counter, and Means that the number of sample particles included in the range of the median of the particle size distribution ± 20 nm is 70% or more of the total number of sample particles.
上記炭酸カルシウムの含有量は５〜１５重量％であり、より好ましくは７〜１５重量％、特に好ましくは１０〜１５重量％である。炭酸カルシウムの含有量が１５重量％を超えると、微生物保持性能が低下するので好ましくない。一方、炭酸カルシウムの含有量が５重量％未満であると、物性（強度）及びコストの点で不利となる。 The content of the calcium carbonate is 5 to 15% by weight, more preferably 7 to 15% by weight, and particularly preferably 10 to 15% by weight. If the content of calcium carbonate exceeds 15% by weight, the microorganism-retaining ability is undesirably reduced. On the other hand, when the content of calcium carbonate is less than 5% by weight, it is disadvantageous in physical properties (strength) and cost.
上記炭酸カルシウムの平均粒径としては特に限定はないが、好ましくは７０〜９０ｎｍ、より好ましくは７５〜８５ｎｍ、特に好ましくは８０ｎｍである。上記したように、ここでいう「平均粒径」は散乱光方式のパーティクルカウンターにより測定した値である。また、ここに示した平均粒径の値は、±１０％程度の幅を有するものとする。 The average particle size of the calcium carbonate is not particularly limited, but is preferably 70 to 90 nm, more preferably 75 to 85 nm, and particularly preferably 80 nm. As described above, the “average particle size” is a value measured by a scattered light type particle counter. Further, the value of the average particle size shown here has a width of about ± 10%.
１つの好ましい実施形態では、微生物保持用担体が回転円板である。回転円板の具体的な形状、構造、サイズ等については、公知のものをそのまま採用することができる。例えば、上記特許文献１〜３に記載の回転円板の形状等を採用することができる。
In one preferred embodiment, the carrier for holding microorganisms is a rotating disk. As for the specific shape, structure, size and the like of the rotating disk, known ones can be employed as they are. For example, the shape of the rotating disk described in
別の好ましい実施形態では、微生物保持用担体が流動担体である。流動担体の具体的な形状、構造、サイズ等については、公知のものをそのまま採用することができる。例えば、上記特許文献４に記載の流動担体の形状等を採用することができる。
In another preferred embodiment, the carrier for retaining microorganisms is a fluid carrier. As the specific shape, structure, size and the like of the fluid carrier, known ones can be used as they are. For example, the shape of the fluidized carrier described in
本発明の微生物保持用担体には、微生物の保持性能を損なわない範囲で、他の成分をさらに含有させてもよい。他の成分としては、炭酸カルシウム以外の無機フィラー、例えばシリカ、ゼオライト、カオリン、あるいは繊維状のグラス繊維、炭素繊維等の各種ファイバーを含有させてもよい。 The carrier for holding microorganisms of the present invention may further contain other components as long as the holding performance of microorganisms is not impaired. As other components, inorganic fillers other than calcium carbonate, for example, silica, zeolite, kaolin, or various fibers such as fibrous glass fiber and carbon fiber may be contained.
本発明の汚水の処理方法では、微生物を保持させた上記の微生物保持用担体に汚水を接触させ、汚水を酸化処理する。微生物保持用担体に汚水を接触させる際の条件としては特に限定はないが、本発明の微生物保持用担体は微生物保持性能に優れるので、十分な酸素供給を実現すべく物理的ストレスが高い操作を行っても、微生物の剥離が抑えられる。
例えば、微生物保持用担体が流動担体である場合には、流動担体を旋回させるための曝気強度を従来技術よりも高く設定することができる。例えば、３〜６ｍ3／ｍ3・時間、より好ましくは４〜６ｍ3／ｍ3・時間、さらに好ましくは５〜６ｍ3／ｍ3・時間、という高い曝気強度を採用することができる。
微生物保持用担体が回転円板である場合には、回転円板の回転速度を従来技術より高く設定することができる。例えば、周速１５〜３０ｍ／分、より好ましくは２０〜３０ｍ／分、という高い回転速度を採用することができる。
In the method for treating sewage of the present invention, sewage is brought into contact with the above-mentioned microorganism holding carrier holding microorganisms, and the sewage is oxidized. The conditions for contacting the wastewater with the carrier for holding microorganisms are not particularly limited, but since the carrier for holding microorganisms of the present invention is excellent in the microorganism holding performance, an operation with high physical stress is required to realize sufficient oxygen supply. Even if performed, the separation of microorganisms is suppressed.
For example, when the carrier for holding microorganisms is a fluid carrier, the aeration intensity for swirling the fluid carrier can be set higher than in the prior art. For example, 3~6m 3 / m 3 · hour and more preferably 4~6m 3 / m 3 · time, more preferably to adopt a high aeration intensity that 5~6m 3 / m 3 · time.
When the carrier for holding microorganisms is a rotating disk, the rotation speed of the rotating disk can be set higher than in the prior art. For example, a high rotation speed of a peripheral speed of 15 to 30 m / min, more preferably 20 to 30 m / min can be adopted.
本発明の汚水処理システムは、上記の微生物保持用担体と、汚水が処理される汚水処理槽とを備え、汚水処理槽内で微生物保持用担体と汚水とを接触させることが可能であることを特徴とするものである。 The sewage treatment system of the present invention includes the above-mentioned microorganism holding carrier and a sewage treatment tank in which sewage is treated, and it is possible to bring the microorganism holding carrier into contact with the sewage in the sewage treatment tank. It is a feature.
本発明の汚水処理システムを用いて、汚水処理槽内で、微生物を保持させた微生物保持用担体と汚水とを接触させることができる。例えば、汚水処理槽内に微生物を保持させた回転円板を設置し、回転円板法による汚水の接触酸化処理を行うことができる。また、汚水処理槽内に微生物を保持させた流動担体を設置し、汚水内で流動させることによって流動担体法による汚水の接触酸化処理を行うことができる。 By using the sewage treatment system of the present invention, a microorganism holding carrier holding microorganisms can be brought into contact with sewage in a sewage treatment tank. For example, a rotating disk holding microorganisms can be installed in a sewage treatment tank, and the contact oxidation treatment of sewage can be performed by the rotating disk method. In addition, by placing a fluid carrier holding microorganisms in a sewage treatment tank and flowing it in the sewage, the contact oxidation treatment of the sewage by the fluid carrier method can be performed.
好ましい実施形態では、汚水原水が導入される調整槽、汚水のｐＨを調整するｐＨ調整槽、接触酸化処理後の汚水（接触酸化処理水）を固液分離するための沈殿槽をさらに備える。例えば、調整槽、ｐＨ調整槽、汚水処理槽、及び沈殿槽をこの順番に設ける。まず汚水原水を調整槽に導入し、汚水の濃度等を調整する。次に、ｐＨ調整槽において汚水のｐＨを調整する。そして、調整後の汚水をｐＨ調整槽から汚水処理槽に導入して接触酸化処理を行う。最後に、接触酸化処理水を沈殿槽に導入し、固液分離を行う構成とすることができる。調整槽、ｐＨ調整槽、及び沈殿槽については、これら全てを備えた構成としてもよいし、これらの一部のみを備えた構成としてもよい。 In a preferred embodiment, the apparatus further includes an adjusting tank into which the raw sewage is introduced, a pH adjusting tank to adjust the pH of the sewage, and a settling tank for solid-liquid separation of the sewage after the contact oxidation treatment (contact oxidized water). For example, an adjustment tank, a pH adjustment tank, a sewage treatment tank, and a sedimentation tank are provided in this order. First, sewage raw water is introduced into a regulating tank, and the concentration of sewage is adjusted. Next, the pH of the sewage is adjusted in the pH adjusting tank. Then, the adjusted sewage is introduced into the sewage treatment tank from the pH adjustment tank to perform a contact oxidation treatment. Finally, it is possible to adopt a configuration in which the contact oxidation treatment water is introduced into the precipitation tank to perform solid-liquid separation. The adjustment tank, the pH adjustment tank, and the precipitation tank may be configured to include all of them, or may be configured to include only some of them.
上記調整槽においては、汚水原水が受け入れられ、汚水原水濃度の均一化や汚水処理槽への汚水導入量の調整が行われる。好ましい実施形態では、調整槽における汚水原水の滞留時間を８時間以上、より好ましくは１２時間以上とし、かつ調整槽に導入される汚水原水の日間平均全有機炭素（ＴＯＣ）濃度に対して、調整槽からの流出する汚水の全有機炭素濃度を−３０％〜＋３０％、より好ましくは−１５％〜＋１５％に調整する。
ｐＨ調整槽においては、濃度等が調整された汚水のｐＨを５．０〜９．０、より好ましくは６．０〜８．０に調整する。
In the adjusting tank, the raw sewage is received, and the concentration of the raw sewage is made uniform and the amount of sewage introduced into the sewage treatment tank is adjusted. In a preferred embodiment, the residence time of the raw sewage in the regulating tank is set to 8 hours or more, more preferably 12 hours or more, and the average daily total organic carbon (TOC) concentration of the raw sewage introduced into the regulating tank is adjusted. The total organic carbon concentration of the sewage flowing out of the tank is adjusted to -30% to + 30%, more preferably -15% to + 15%.
In the pH adjusting tank, the pH of the sewage whose concentration or the like has been adjusted is adjusted to 5.0 to 9.0, more preferably 6.0 to 8.0.
上記沈殿槽において、接触酸化処理後の汚水（接触酸化処理水）を固液分離する。好ましい実施形態では、沈殿槽から流出する処理水（沈殿槽処理水）に存在する単位体積あたりの固形成分量を、沈殿槽に流入する接触酸化処理水に存在する単位体積あたりの固形成分量の１５％以下、より好ましくは１０％以下となるようにする。換言すれば、沈殿槽における固形成分の除去率を８５％以上、より好ましくは９０％以上となるようにする。 In the sedimentation tank, the wastewater after the contact oxidation treatment (contact oxidation treatment water) is subjected to solid-liquid separation. In a preferred embodiment, the solid component amount per unit volume present in the treated water flowing out of the settling tank (precipitated tank treated water) is determined by the solid component amount per unit volume present in the contact oxidation treated water flowing into the settling tank. It is set to 15% or less, more preferably 10% or less. In other words, the removal rate of the solid component in the precipitation tank is set to 85% or more, more preferably 90% or more.
以下、実施例をもって本発明をさらに具体的に説明するが、本発明はこれらの実施例に限定されるものではない。 Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to these Examples.
１．炭酸カルシウム含有量の検討
基材樹脂としてポリエチレン又はポリプロピレンを用い、炭酸カルシウムを、樹脂組成物全体に対する含有量が５重量％（条件１）、１０重量％（条件２）、１５重量％（条件３）、２０重量％（条件４）、２５重量％（条件５）、３０重量％（条件６）、３５重量％（条件７）、又は４０重量％（条件８）となるように添加して、計１６種の樹脂組成物（樹脂材料）を調製した。各樹脂組成物を成形して１６種の回転円板を作製した。各回転円板について、微生物保持性能と水質浄化性能を検証した。
1. Examination of the content of calcium carbonate Using polyethylene or polypropylene as the base resin, the content of calcium carbonate in the entire resin composition was 5% by weight (condition 1), 10% by weight (condition 2), and 15% by weight (condition 3). ), 20% by weight (condition 4), 25% by weight (condition 5), 30% by weight (condition 6), 35% by weight (condition 7), or 40% by weight (condition 8), A total of 16 types of resin compositions (resin materials) were prepared. Each resin composition was molded to produce 16 types of rotating disks. For each rotating disk, the microorganism retention performance and water purification performance were verified.
基材樹脂がポリプロピレンの場合には、特開２０００−１５３２８８号公報に記載の構成からなる回転円板を作製した。詳細には、立体格子状である直径１．２ｍのポリプロプレン製円板体を複数用い、隣り合う円板同士を嵌合および連結ボルトを用いた係合により固定して、円板体表面積が２１０ｍ2の回転円板ブロックを作製した。容量１．９６ｍ3の水槽に前記回転円板ブロックの約４０％が浸漬する回転円板装置を作製し、以下の試験に用いた。 When the base resin was polypropylene, a rotating disk having the configuration described in JP-A-2000-153288 was produced. In detail, a plurality of discs made of polypropylene having a diameter of 1.2 m and having a three-dimensional lattice shape are used, and adjacent discs are fixed to each other by fitting and engagement using connection bolts, so that the disc body surface area is reduced. A rotating disk block of 210 m 2 was produced. A rotating disk device in which about 40% of the rotating disk block was immersed in a water tank having a capacity of 1.96 m 3 was prepared and used for the following tests.
基材樹脂がポリエチレンの場合には、特開平６−９９１８４号公報に記載の構成からなる回転円板を作製した。詳細には、凹凸のある直径２．０ｍのポリエチレン製円板体を複数用い、これらを熱融着により一体化して、円板体表面積が２０７ｍ2の回転円板ブロックを作製した。容量１．９６ｍ3の水槽に前記回転円板ブロックの約４０％が浸漬する回転円板装置を作製し、以下の試験に用いた。 When the base resin was polyethylene, a rotating disk having the configuration described in JP-A-6-99184 was prepared. Specifically, a plurality of discs made of polyethylene having a diameter of 2.0 m and having irregularities were used, and these were integrated by heat fusion to produce a rotating disc block having a disc body surface area of 207 m 2 . A rotating disk device in which about 40% of the rotating disk block was immersed in a water tank having a capacity of 1.96 m 3 was prepared and used for the following tests.
微生物保持性能の試験としては、上記の回転円板装置を用いて、円板体表面積および流入負荷とも同条件で排水処理実験を行い、円板体の表面積あたりに付着する微生物乾燥重量（ｇ−ＤＳ／ｍ2）を比較した。流入原水のＴＯＣ濃度は、いずれも８００ｍｇ／Ｌとした。また水質浄化性能の試験として、各条件における処理水の水質（ＴＯＣ濃度）を比較した。 As a test of the microorganism retention performance, a wastewater treatment experiment was performed using the above-mentioned rotating disk device under the same conditions for the disk surface area and the inflow load, and the dry microorganism weight (g- DS / m 2 ). The TOC concentration of the inflowing raw water was 800 mg / L in each case. In addition, as a test of water purification performance, the quality of treated water (TOC concentration) under each condition was compared.
図１に微生物保持性能の試験結果を示す。図１（ａ）は基材樹脂としてポリエチレンを用いた場合、図１（ｂ）は基材樹脂としてポリプロピレンを用いた場合である。いずれの基材樹脂を用いた場合でも、炭酸カルシウムの含有量が５重量％（条件１）、１０重量％（条件２）、１５重量％（条件３）のときに特に高い微生物保持性能が得られた。 FIG. 1 shows the test results of the microorganism retention performance. FIG. 1A shows the case where polyethylene is used as the base resin, and FIG. 1B shows the case where polypropylene is used as the base resin. Regardless of which base resin is used, particularly high microorganism retention performance is obtained when the content of calcium carbonate is 5% by weight (condition 1), 10% by weight (condition 2), and 15% by weight (condition 3). Was done.
図２に水質浄化性能の試験結果を示す。図２（ａ）は基材樹脂としてポリエチレンを用いた場合、図２（ｂ）は基材樹脂としてポリプロピレンを用いた場合である。グラフ中の棒は処理後のＴＯＣ濃度（ｍｇ／Ｌ）、折れ線はＴＯＣ除去率（％）である。いずれの基材樹脂を用いた場合でも、炭酸カルシウムの含有量が５重量％（条件１）、１０重量％（条件２）、１５重量％（条件３）のときに特に高い水質浄化性能が得られた。 FIG. 2 shows the test results of the water purification performance. FIG. 2A shows the case where polyethylene is used as the base resin, and FIG. 2B shows the case where polypropylene is used as the base resin. The bar in the graph indicates the TOC concentration (mg / L) after the treatment, and the broken line indicates the TOC removal rate (%). Regardless of which base resin is used, particularly high water purification performance is obtained when the content of calcium carbonate is 5% by weight (condition 1), 10% by weight (condition 2), and 15% by weight (condition 3). Was done.
２．流動担体を用いた場合の曝気強度検討
樹脂基材としてポリエチレンを用い、炭酸カルシウムの含有量を１５重量％（条件３）として樹脂組成物を調製した。この樹脂組成物を用いて一辺１ｃｍの立方体形状に発泡成形した流動担体（比重０．９９ｇ／ｃｍ3、比表面積３０００ｍ2／ｍ3）を作製した。この流動担体に微生物を保持させ、汚水処理用の流動担体とした。
この流動担体に汚水を接触させ、曝気強度を１、２、３、４、５、又は６ｍ3／ｍ3・ｈとして汚水処理を行った。処理用水槽の容量は１００Ｌ、担体の充填率は処理用水槽の容積に対して２０％、流入原水のＴＯＣ濃度は４２０ｍｇ／Ｌとし、処理前後の汚水についてＴＯＣ濃度を測定した。
図３に結果を示す。グラフ中の棒は処理後のＴＯＣ濃度（ｍｇ／Ｌ）、折れ線はＴＯＣ除去率（％）である。すなわち、曝気強度が４〜６ｍ3／ｍ3・ｈの場合に特に高い水質浄化性能が得られた。
2. Examination of aeration strength when using a fluid carrier A resin composition was prepared using polyethylene as a resin base material and a content of calcium carbonate of 15% by weight (condition 3). Using this resin composition, a fluid carrier (specific gravity 0.99 g / cm 3 , specific surface area 3000 m 2 / m 3 ) foamed into a cubic shape with a side of 1 cm was prepared. Microorganisms were held on this fluid carrier to obtain a fluid carrier for sewage treatment.
Sewage was brought into contact with the fluid carrier, and sewage treatment was performed with an aeration intensity of 1, 2, 3, 4, 5, or 6 m 3 / m 3 · h. The capacity of the water tank for treatment was 100 L, the filling rate of the carrier was 20% of the volume of the water tank for treatment, the TOC concentration of the inflowing raw water was 420 mg / L, and the TOC concentration of the wastewater before and after the treatment was measured.
FIG. 3 shows the results. The bar in the graph indicates the TOC concentration (mg / L) after the treatment, and the broken line indicates the TOC removal rate (%). That is, particularly high water purification performance was obtained when the aeration intensity was 4 to 6 m 3 / m 3 · h.
３．回転円板を用いた場合の周速検討
上記１において、樹脂基材としてポリプロピレンを用い、炭酸カルシウムの含有量を１５重量％（条件３）とした場合と同様の回転円板装置を作製した。この装置の回転円板にＴＯＣ濃度１２００ｍｇ／Ｌの汚水を流入させることで微生物を保持させ、汚水処理用の回転円板とした。回転円板の周速を１０、１５、２０、２５、又は３０ｍ／分として汚水処理を行い、処理前後の汚水について、ＴＯＣ濃度を測定した。
図４に結果を示す。グラフ中の棒は処理後のＴＯＣ濃度（ｍｇ／Ｌ）、折れ線はＴＯＣ除去率（％）である。すなわち、周速が１５〜３０ｍ／分の場合に特に高い水質浄化性能が得られた。
3. Investigation of peripheral speed in the case of using a rotating disk A rotating disk device similar to that in the case of the
FIG. 4 shows the results. The bar in the graph indicates the TOC concentration (mg / L) after the treatment, and the broken line indicates the TOC removal rate (%). That is, a particularly high water purification performance was obtained when the peripheral speed was 15 to 30 m / min.
４．負荷変動に対する耐性評価
上記１において、樹脂基材としてポリプロピレンを用い、炭酸カルシウムの含有量を１５重量％（条件３）とした場合と同様の回転円板装置を作製した。この装置を用いて、汚水処理槽への流入ＴＯＣ濃度が異なる２つ条件（高負荷条件と低負荷条件）を交互に５回繰り返して汚水処理を行い（ｒｕｎ１〜１０）、負荷変動に対する耐性を評価した（実施例）。汚水処理システムの構成として、調整槽、汚水処理槽（回転円板を含む）、及び沈殿槽が直列に連結された構成を採用した。
比較例として、炭酸カルシウム含有量が４０重量％（条件８）のポリプロピレン製回転円板を用いて同様の評価を行った。
4. Evaluation of Resistance to Load Fluctuation A rotary disk device similar to that described in 1 above, except that polypropylene was used as the resin base material and the content of calcium carbonate was 15% by weight (condition 3). Using this device, two conditions (high load condition and low load condition) having different TOC concentrations flowing into the sewage treatment tank are alternately repeated five times to perform sewage treatment (
As a comparative example, the same evaluation was performed using a polypropylene rotating disk having a calcium carbonate content of 40% by weight (condition 8).
（汚水処理システムの仕様）
・調整槽での滞留時間：１２時間
・汚水処理槽への設計流入ＴＯＣ：８００ｍｇ／Ｌ
・汚水処理槽への流入汚水ｐＨ：６．０〜８．０
・回転円板の周速：１８ｍ／分
・沈殿槽の面積負荷：２０ｍ3／ｍ2・日
(Specification of sewage treatment system)
・ Residence time in the adjustment tank: 12 hours ・ Design inflow TOC into the sewage treatment tank: 800 mg / L
-Inflow sewage pH into the sewage treatment tank: 6.0 to 8.0
・ Circumferential speed of rotating disk: 18m / min ・ Area load of sedimentation tank: 20m 3 / m 2・ day
結果を図５と表１に示す。図５はＴＯＣ除去率の変化を表すグラフであり、（ａ）は高負荷条件（ｒｕｎ１、３、５、７、９）、（ｂ）は低負荷条件（ｒｕｎ２、４、６、８、１０）の場合を示す。すなわち、実施例の回転円板を用いた場合は、高負荷運転と低負荷運転を５回繰り返しても水質浄化性能の低下は認められなかった。これに対し、比較例の回転円板を用いた場合は、高負荷運転２回目（ｒｕｎ３）から水質浄化性能の低下が認められた。
The results are shown in FIG. 5A and 5B are graphs showing changes in the TOC removal rate. FIG. 5A shows a high load condition (
Claims (11)
前記微生物保持用担体は、ポリオレフィンを主要な樹脂基材とし、平均形状が粒状の炭酸カルシウムを５〜１５重量％含有し、前記微生物保持用担体が回転円板であることを特徴とする微生物保持用担体。 A carrier for holding microorganisms used for contact oxidation treatment of sewage,
The microorganism-holding carrier comprises a polyolefin as a main resin base material, contains 5 to 15% by weight of granular calcium carbonate having an average shape , and the microorganism-holding carrier is a rotating disk. Carrier.
汚水が処理される汚水処理槽と、を備え、
前記汚水処理槽内で前記微生物保持用担体と汚水とを接触させることが可能であることを特徴とする汚水処理システム。 A carrier for holding microorganisms according to any one of claims 1 to 3 ,
And a sewage treatment tank for treating sewage,
A sewage treatment system, wherein the microorganism holding carrier and sewage can be brought into contact in the sewage treatment tank.
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| KR100632386B1 (en) * | 2004-12-30 | 2006-10-12 | 학교법인 포항공과대학교 | Microbial Membrane Carrier Comprising Polymer Composites, Manufacturing Method Thereof, Biological Wastewater Treatment and Biological Filtration Method |
| CN100341797C (en) * | 2005-09-22 | 2007-10-10 | 南京大学 | Amino benzene analog waste water biological treatment method |
| CN101284694B (en) * | 2007-04-15 | 2010-04-21 | 于春荣 | Hydrophilic active biological film suspend carrier and method for making the same |
| CN102887591A (en) * | 2011-07-22 | 2013-01-23 | 苏州微体电子科技有限公司 | Water treatment suspension biological carrier |
| CN202542938U (en) * | 2011-11-28 | 2012-11-21 | 积水设备系统株式会社 | Rotation circular plate type sewage treatment device and rotation circular plates |
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| CN106045019B (en) | 2021-09-21 |
| CN106045019A (en) | 2016-10-26 |
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