JPH0647397A - Biological nitrifying and denitrifing apparatus - Google Patents
Biological nitrifying and denitrifing apparatusInfo
- Publication number
- JPH0647397A JPH0647397A JP4212289A JP21228992A JPH0647397A JP H0647397 A JPH0647397 A JP H0647397A JP 4212289 A JP4212289 A JP 4212289A JP 21228992 A JP21228992 A JP 21228992A JP H0647397 A JPH0647397 A JP H0647397A
- Authority
- JP
- Japan
- Prior art keywords
- fixed bed
- water
- bed
- nitrification
- tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001546 nitrifying effect Effects 0.000 title abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 239000008187 granular material Substances 0.000 claims description 18
- 238000005273 aeration Methods 0.000 claims 1
- 238000005406 washing Methods 0.000 abstract description 17
- 239000002351 wastewater Substances 0.000 abstract description 11
- 230000001174 ascending effect Effects 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 description 21
- 241000894006 Bacteria Species 0.000 description 17
- 238000012545 processing Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 13
- 238000001914 filtration Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 229920005830 Polyurethane Foam Polymers 0.000 description 7
- 239000011496 polyurethane foam Substances 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 3
- 239000003830 anthracite Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- -1 sewage Chemical compound 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アンモニア性窒素（Ｎ
Ｈ3 −Ｎ）を含む有機性汚水を生物学的に硝化脱窒素す
る処理装置に関する。特に、処理のための動力を軽減で
き、処理槽の洗浄が容易である新規装置に関する。BACKGROUND OF THE INVENTION The present invention relates to ammoniacal nitrogen (N
The present invention relates to a treatment device for biologically nitrifying and denitrifying organic wastewater containing H 3 -N). In particular, the present invention relates to a new device that can reduce the power for processing and can easily clean the processing tank.
【０００２】[0002]
【従来の技術】従来より図３に示すように、アンスラサ
イトなどの粒状鉱物のろ材を充填した浸漬固定ろ床を有
する処理槽を２槽使用し、原水供給管１９から原水が流
入する第１の処理槽にはろ材に脱窒素菌を保持せしめて
脱窒素ろ床２０とし、また別の第２の処理槽にはろ材に
硝化菌を保持せしめて硝化ろ床２１とし、これら脱窒素
ろ床２０と硝化ろ床２１を直列的に配置し、脱窒素ろ床
２０を下向流で通水して得た脱窒素処理水を循環用配管
３１を経て硝化ろ床２１の上部から流入し、該ろ床の下
部の散気管２２から空気を吹き込んで硝化ろ床２１で好
気的に硝化処理し、その流出水（硝化液と呼ぶ）を一旦
処理水槽２３に貯留した後、ポンプ３０によって脱窒素
ろ床２０に循環する２基の浸漬固定ろ床を使用する構成
の生物学的硝化脱窒素装置は公知である。2. Description of the Related Art Conventionally, as shown in FIG. 3, two treatment tanks having an immersion fixed filter bed filled with a filter material of granular mineral such as anthracite are used, and raw water is supplied from a raw water supply pipe 19 to the first tank. The denitrifying filter bed 20 in which the denitrifying bacteria are retained in the filter medium is used as the denitrifying filter bed 20 and the nitrifying bacteria are retained in the filter medium as the nitrifying filter bed 21 in the second treatment tank. 20 and the nitrification filter bed 21 are arranged in series, and denitrification treated water obtained by passing the denitrification filter bed 20 in a downward flow is introduced from the upper part of the nitrification filter bed 21 through a circulation pipe 31. Air is blown from the air diffusing pipe 22 at the lower part of the filter bed to aerobically nitrify it in the nitrification filter bed 21, and the outflow water (referred to as nitrification solution) is once stored in the treated water tank 23 and then degassed by the pump 30. Biological nitrification and denitration in a configuration using two immersed fixed filters circulating in the nitrogen filter 20. Arsenide devices are known.
【０００３】しかし、この従来技術は次のような欠点が
あり、さらに優れた技術の開発が切望されている。 脱窒素ろ床２０に、ＳＳを含んだ有機汚水が流入す
るが、ろ床の目詰まりの進行が早く、頻繁にろ床洗浄を
行わなければならない。その結果、洗浄用水の消費量、
洗浄排水の発生量が多い。 脱窒素ろ床２０と硝化ろ床２１を別々に洗浄しなけ
ればならないという不便さがある。その上ますます洗浄
排水の発生量が多くなる。 硝化反応速度、脱窒素反応速度が小さいので、反応
槽が大きく、建設コスト、設置スペースがかさむ。 このため、さらに高効率でかつ安定した硝化脱窒素処理
ができるコンパクトな装置が要望されている。However, this conventional technique has the following drawbacks, and the development of a more excellent technique has been earnestly desired. Organic wastewater containing SS flows into the denitrification filter bed 20, but the filter bed is clogged quickly, and the filter bed must be frequently washed. As a result, the consumption of washing water,
A large amount of cleaning wastewater is generated. There is an inconvenience that the denitrification filter bed 20 and the nitrification filter bed 21 must be separately washed. In addition, the amount of cleaning wastewater generated will increase. Since the nitrification reaction rate and denitrification reaction rate are small, the reaction tank is large, and construction cost and installation space are large. Therefore, there is a demand for a compact device that can perform nitrifying and denitrifying treatment with higher efficiency and stability.
【０００４】[0004]
【発明が解決しようとする課題】本発明の課題は、上記
〜の欠点をすべて解消できる新技術を提供するもの
である。すなわち、 １）硝化液の循環をポンプなどの動力を用いず、単一槽
で硝化脱窒素を行えるようにする。 ２）ろ床洗浄を合理化する。 ３）ろ床の閉塞を減少させ、ろ床の洗浄頻度を著しく少
なくする。 ４）硝化反応、脱窒素反応速度を顕著に向上させる。 ５）最初に設ける沈殿池を不要にする。 以上の機能を有するコンパクトな装置の提供を課題とす
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a new technique capable of solving all of the above-mentioned disadvantages (1) to (3). That is, 1) Nitrification and denitrification can be performed in a single tank without using a pump or the like to circulate the nitrification liquid. 2) Streamline filter bed cleaning. 3) Reduce filter bed blockage and significantly reduce filter bed wash frequency. 4) Remarkably improve the nitrification reaction and denitrification reaction rate. 5) The first settling tank is unnecessary. An object is to provide a compact device having the above functions.
【０００５】[0005]
【課題を解決するための手段】上記課題は下記上向流式
生物学的処理装置の発明によって達成される。すなわ
ち、アンモニア性窒素を含む排水を、立体的網目構造を
もつ粒状物を充填した固定床Ａに下向流で通水して、生
物学的脱窒素した後、隣接して設けた立体的網目構造を
もつ粒状物を充填した固定床Ｂに上向流で通水して、生
物学的硝化を行い、該固定床Ｂからの流出水の一部を前
記固定床Ａに循環せしめるように構成すると共に、固定
床Ａと固定床Ｂの下部に散気部材を設けたことを特徴と
する生物学的硝化脱窒素装置である。The above object can be achieved by the invention of an upflow biological treatment apparatus described below. That is, drainage containing ammoniacal nitrogen is passed downwardly through a fixed bed A filled with a granular material having a three-dimensional network structure to perform biological denitrification, and then a three-dimensional network provided adjacently A fixed bed B filled with a granular material having a structure is passed through in an upward flow to perform biological nitrification, and a part of the outflow water from the fixed bed B is circulated to the fixed bed A. In addition, the biological nitrification and denitrification apparatus is characterized in that a diffusing member is provided below the fixed bed A and the fixed bed B.
【０００６】なお、上記生物学的硝化脱窒素装置の固定
床Ｂ内の中間部にグレーチングなどの多孔性透水部材を
設ける装置とすることが好ましい。ここで、上記固定床
Ａに隣接して固定床Ｂを設けるとは、一つの方式は図１
に示すように単一槽内に中仕切りＣを設けて２分割し、
固定床Ａに隣接して固定床Ｂを設ける方式であり、別の
方式は図２に示すように独立して固定床Ａを有する処理
槽Ｘと固定床Ｂを有する処理槽Ｙを隣接して設置する方
式を意味する。すなわち、両固定床間にいかなる処理・
移送手段をも有さない構成である。It is preferable that the biological nitrification and denitrification apparatus is provided with a porous water permeable member such as a grating in the middle portion of the fixed bed B. Here, providing the fixed bed B adjacent to the fixed bed A is one method as shown in FIG.
As shown in, a partition C is provided in a single tank to divide it into two,
A fixed bed B is provided adjacent to the fixed bed A, and another method is such that a processing tank X having a fixed bed A and a processing tank Y having a fixed bed B are independently adjacent to each other as shown in FIG. It means the method of installation. That is, any treatment between both fixed beds
It is a structure without a transfer means.
【０００７】本発明の具体例を図１と図２に示し、図を
参照しながら本発明の具体的な構成について説明する。
しかしながら、本発明は以下の説明によって制限される
ものではない。Specific examples of the present invention are shown in FIGS. 1 and 2, and a specific configuration of the present invention will be described with reference to the drawings.
However, the present invention is not limited by the following description.
【０００８】図１において本発明の処理槽１内に、立体
的網目構造をもつ粒状物からなるろ材を充填した充填層
からなる固定床Ａと中仕切り壁Ｃを隔ててやはり立体的
網目構造をもつ粒状物からなるろ材を充填した充填層か
らなる固定床Ｂが設けられている。固定床Ａは生物学的
な脱窒素と原水ＳＳのろ過を行う領域であり、固定床Ｂ
は生物学的な硝化とＳＳの高度なろ過を行う領域であ
る。In FIG. 1, a three-dimensional mesh structure is formed in a treatment tank 1 of the present invention by separating a fixed bed A composed of a packed bed filled with a filter material made of a granular material having a three-dimensional mesh structure and a partition wall C. A fixed bed B composed of a packed bed filled with a filter medium composed of granular material is provided. Fixed bed A is an area for biological denitrification and filtration of raw water SS, and fixed bed B
Is an area for biological nitrification and advanced SS filtration.
【０００９】下水などアンモニア性窒素を含む有機性汚
水（以下原水という）１７は原水供給管２を経て処理槽
１の固定床Ａに流入し、固定床Ａを下向流として通って
その下部の脱窒素液流出部３から固定床Ｂに入り固定床
Ｂを上向流として通水し、循環硝化液流入部４から再び
固定床Ａに流入する。また固定床Ｂを上向流として通っ
た循環液の一部は処理水１８として処理水流出管１６か
ら流出する。Organic wastewater (hereinafter referred to as raw water) 17 containing ammonia nitrogen, such as sewage, flows into the fixed bed A of the treatment tank 1 through the raw water supply pipe 2, passes through the fixed bed A as a downward flow, and flows downward. It enters the fixed bed B from the denitrification solution outflow part 3 to pass water through the fixed bed B as an upward flow, and then flows into the fixed bed A again from the circulating nitrification solution inflow part 4. A part of the circulating liquid that has passed through the fixed bed B as an upward flow flows out as treated water 18 from the treated water outflow pipe 16.
【００１０】処理槽１の上部には、固定床Ａの上部を覆
って固定床Ａの充填ろ材の流出を防止するためのグレー
チング（格子）５が、また固定床Ｂの上部を覆って固定
床Ｂの充填ろ材の流出を防止するためのグレーチング
（格子）６がそれぞれ張設されている。また処理槽１の
下部にはそれぞれ、固定床Ａの下部にその固定床Ａを空
洗するための散気管１０が、固定床Ｂの下部にはその固
定床Ｂに保持されている微生物に酸素を供給するための
散気管７が設けられている。散気管７に送る酸素含有ガ
スはブロア９からガス供給管８を経て送られ、散気部材
１０には空気供給管１１を経てブロア１２から空気を供
給する。A grating (lattice) 5 is provided on the upper part of the processing tank 1 for covering the upper part of the fixed bed A to prevent the flow of the filling filter medium of the fixed bed A, and on the upper part of the fixed bed B, a fixed bed. Gratings (lattice) 6 for preventing the B filled filter medium from flowing out are stretched. Further, in the lower part of the treatment tank 1, an air diffuser 10 for air-washing the fixed bed A is provided in the lower part of the fixed bed A, and in the lower part of the fixed bed B, oxygen is added to the microorganisms retained in the fixed bed B. An air diffuser 7 is provided to supply the air. The oxygen-containing gas to be sent to the air diffuser 7 is sent from the blower 9 via the gas supply pipe 8, and the air diffuser 10 is supplied with air from the blower 12 via the air supply pipe 11.
【００１１】固定床Ａおよび固定床Ｂを洗浄する時、洗
浄水の供給は処理槽１上部の洗浄水供給管１５から行な
い、洗浄水の排水は処理槽１の上部の弁１４を備えた洗
浄排水管１３から行う。When cleaning the fixed bed A and the fixed bed B, the cleaning water is supplied from the cleaning water supply pipe 15 above the processing tank 1, and the cleaning water is drained by the cleaning valve equipped with the valve 14 above the processing tank 1. Perform from the drain pipe 13.
【００１２】図２に示した処理装置は２基の処理槽Ｘお
よびＹよりなり、処理槽Ｘ内に、立体的網目構造をもつ
粒状物からなるろ材を充填した充填層からなる固定床Ａ
が設けられ、処理槽Ｙ内には立体的網目構造をもつ粒状
物からなるろ材を充填した充填層からなる固定床Ｂが設
けられている。処理槽Ｘ内の固定床Ａは生物学的な脱窒
素と原水ＳＳのろ過を行う領域であり、処理槽Ｙ内の固
定床Ｂは生物学的な硝化とＳＳの高度なろ過を行う領域
である。The processing apparatus shown in FIG. 2 comprises two processing tanks X and Y, and a fixed bed A composed of a packed bed in which the processing tank X is filled with a filter material made of granular material having a three-dimensional network structure.
And a fixed bed B made of a packed bed filled with a filter medium made of a granular material having a three-dimensional mesh structure. Fixed bed A in treatment tank X is an area for biological denitrification and filtration of raw water SS, and fixed bed B in treatment tank Y is an area for biological nitrification and advanced filtration of SS. is there.
【００１３】上記図１の１槽構成の処理槽１の場合に相
似して、図２の場合においても原水１７は原水供給管２
を経て処理槽Ｘの固定床Ａに流入し、固定床Ａを下向流
として通って底部で処理槽Ｘと処理槽Ｙを連絡する脱窒
素液流出部３から処理槽Ｙの固定床Ｂに入り固定床Ｂを
上向流として通水し、処理槽Ｙの上部の循環硝化液流入
部４から再び処理槽Ｘの固定床Ａに流入する。また処理
槽Ｙの固定床Ｂを上向流として通った循環液の一部は処
理水１８として処理槽Ｙの上部に設けた処理水流出管１
６から流出する。その他の処理槽Ｘ内、処理槽Ｙ内およ
びそれらの周辺に配備されるべき部材およびそれら部材
の役割は上記図１の１槽構成の処理槽の場合を参照すれ
ば図２から容易に理解できる。Similar to the case of the treatment tank 1 having the one-chamber structure shown in FIG. 1, the raw water 17 is supplied to the raw water supply pipe 2 in the case of FIG.
To the fixed bed B of the treatment tank Y from the denitrification solution outflow portion 3 which connects the treatment tank X and the treatment tank Y at the bottom through the fixed bed A as a downward flow. Water flows through the fixed bed B as an upward flow, and then flows into the fixed bed A of the treatment tank X again from the circulating nitrification solution inflow portion 4 in the upper portion of the treatment tank Y. A part of the circulating liquid that has passed through the fixed bed B of the treatment tank Y as an upward flow is treated water 18 and is a treated water outflow pipe 1 provided in the upper portion of the treated tank Y.
Outflow from 6. The other members to be provided in the processing tank X, the processing tank Y, and the periphery thereof and the roles of these members can be easily understood from FIG. 2 by referring to the case of the processing tank having the one tank configuration shown in FIG. .
【００１４】上記図１および図２に示したいずれの方式
の処理装置においても、固定床Ａおよび固定床Ｂに充填
するろ材を構成する立体的網目構造をもつ粒状物は、表
面から内部にかけて連続した穴を持つように形成され、
有機高分子、無機化合物等公知のものを使用して公知の
発泡法等により製造できる。粒状物の素材としては上記
発泡法に適性を有するものならば特に制限されないが、
中でも素材自体に適度な弾性と強度とを有するウレタン
樹脂等が好ましい。ろ材は例えば、ポリウレタンフォー
ム等の多孔性粒状物を所望の形状、サイズに切断して使
用する。In both of the processing apparatuses shown in FIGS. 1 and 2, the granular material having a three-dimensional network structure which constitutes the filter medium to be packed in the fixed beds A and B is continuous from the surface to the inside. Formed to have a hole
It can be produced by a known foaming method using known materials such as organic polymers and inorganic compounds. The granular material is not particularly limited as long as it is suitable for the foaming method,
Above all, a urethane resin or the like having appropriate elasticity and strength in the material itself is preferable. As the filter medium, for example, a porous granular material such as polyurethane foam is cut into a desired shape and size before use.
【００１５】そのサイズは１０〜３０ｍｍ、好ましくは
１５〜２０ｍｍであり、形状は角形、球状、その他種々
の形状がとれるが、角形が好ましい。その素材の比重
は、通常１．０〜１．２程度が好ましく、特に１．１〜
１．２程度が好ましい。また、空隙率は、９０％以上が
好ましい。気孔径、即ち、孔径は、０．１〜６ｍｍ、好
ましくは２〜４ｍｍの範囲から選択することが望まし
い。また、１ｃｍ長さ当たりの孔の数は、５〜２０個が
好ましい。The size is 10 to 30 mm, preferably 15 to 20 mm, and the shape can be square, spherical, and various other shapes, but the square is preferable. The specific gravity of the material is usually preferably about 1.0 to 1.2, particularly 1.1 to
About 1.2 is preferable. The porosity is preferably 90% or more. It is desirable that the pore diameter, that is, the pore diameter is selected from the range of 0.1 to 6 mm, preferably 2 to 4 mm. The number of holes per 1 cm length is preferably 5 to 20.
【００１６】（作用）以下に本発明の作用を単一槽方式
の場合を参照しつつ説明するが、２槽構成の場合も同様
である。下水などアンモニア性窒素を含む有機性汚水
（原水）１７は処理槽１の上部から固定床Ａに流入し、
散気のエアリフト作用を受けている固定床Ｂを上向流と
して通った硝化循環液と共に固定床Ａ内を下向流として
通水する。固定床Ｂに充填されている立体的網目構造を
もつ粒状物からなるろ材にはその網目構造内に１５００
０〜１８０００ｍｇ／リットル（実測値）もの高濃度の
脱窒素菌が固定化されているため、原水中のＢＯＤを用
いて固定床Ｂからの硝化循環液中のＮＯX −Ｎ（硝酸性
窒素）をＮ2 ガスに還元する。この脱窒素菌が行う反応
は次の式で表される。 （なお、散気管１０から少量の空気などガスを常時吐出
しても生成Ｎ2 ガスを追い出し易くなるので好適であ
る。）(Operation) The operation of the present invention will be described below with reference to the case of the single tank system, but the same applies to the case of the two tank structure. Organic wastewater (raw water) 17 containing ammonia nitrogen such as sewage flows into the fixed bed A from the upper part of the treatment tank 1,
The fixed bed A, which has been subjected to the air lift action of diffused air, flows through the fixed bed A as a downward flow together with the nitrifying circulating liquid that has passed as an upward flow. The filter made of granular material having a three-dimensional mesh structure packed in the fixed bed B has 1500 meshes in the mesh structure.
0～18000Mg / l (measured value) as a high concentration for denitrifying bacteria are immobilized, NO X -N nitrification circulating fluid from the fixed bed B using BOD in the raw water (nitrate nitrogen) Is reduced to N 2 gas. The reaction performed by this denitrifying bacterium is represented by the following formula. (Note that even if a small amount of gas such as air is constantly discharged from the air diffusing pipe 10, the generated N 2 gas is easily expelled, which is preferable.)
【００１７】固定床Ａを構成する立体網目状の粒状物か
らなるろ材はＳＳのろ過性能にも優れているため、固定
床Ａ内を通過することによって原水中のＳＳがろ過除去
され、固定床Ａからの流出水のＳＳは通常１０〜１５ｍ
ｇ／リットル以下に低下する。なお、立体的網目状の粒
状物に上記ポリウレタンフォーム粒状物を、特に好まし
くは比重が１．１〜１．２程度であるポリウレタンフォ
ーム粒状物を用いると、脱窒素反応によって発生するＮ
2 ガスとＣＯ2 ガス気泡がポリウレタンフォームの網目
構造に捕捉される結果、見掛け比重が１．０以下にな
り、固定床Ａは浮上した状態の充填層として多孔部材５
の下部に形成されることが認められた。Since the filter medium composed of a three-dimensional mesh-like granular material that constitutes the fixed bed A is excellent in the filtration performance of SS, SS in the raw water is filtered and removed by passing through the fixed bed A, and the fixed bed is fixed. SS of runoff water from A is usually 10 to 15 m
It falls below g / liter. When the above-mentioned polyurethane foam granules are used as the three-dimensional network granules, and particularly preferably the polyurethane foam granules having a specific gravity of about 1.1 to 1.2 are used, N generated by denitrification reaction is generated.
As a result of trapping 2 gas and CO 2 gas bubbles in the network structure of the polyurethane foam, the apparent specific gravity becomes 1.0 or less, and the fixed bed A serves as a floating packed layer and the porous member 5
It was observed that it was formed in the lower part of the.
【００１８】しかして、原水中のＢＯＤ、ＳＳおよび循
環硝化液中のＮＯX −Ｎの大部分が除去された固定床Ａ
からの流出水は、散気管７から吐出される空気泡と共
に、生物学的硝化反応が進行する固定床Ｂに進入して行
く。固定床Ｂを構成する立体網目状粒状物には、その内
部および表面には硝化菌が高濃度に固定化されているの
で、原水中のＮＨ3 −Ｎが の反応によって高速度で硝化され、ＢＯＤも生物学的に
除去され、ＳＳもさらにろ過除去され、ＳＳが５ｍｇ／
リットル以下の極めて清澄な処理水１８となって処理水
流出管１６から系外に流出する。Fixed bed A from which most of BOD and SS in raw water and NO X -N in circulating nitrification solution was removed
The outflow water from the water flows into the fixed bed B where the biological nitrification reaction proceeds along with the air bubbles discharged from the air diffusing pipe 7. Since the nitrifying bacteria are immobilized at a high concentration inside and on the surface of the three-dimensional mesh-like granular material that constitutes the fixed bed B, NH 3 -N in the raw water is Nitrification at a high rate by the reaction of, the BOD is biologically removed, the SS is further removed by filtration, and the SS is 5 mg /
It becomes extremely clear treated water 18 of liter or less and flows out of the system through the treated water outflow pipe 16.
【００１９】固定床Ｂもまたポリウレタンフォーム粒状
ろ材中に捕捉された空気泡により見掛け比重が水より小
さくなり浮上層を形成する。さらに、固定床Ｂ内の硝化
処理を受ける水は散気のエアリフト作用を受けるため固
定床Ａ内の原水に比べて槽内での水位が高く、また充填
層Ａ、Ｂの空隙率が大きいことにより通水抵抗が小さい
ため、処理水の一部は循環硝化液流入部４を通って再び
脱窒素部（固定床Ａ）の領域に自動的に循環される。図
１に示した単一処理槽における上記固定床Ｂ内の硝化処
理を受ける水の密度が固定床Ａ内の原水に比べて小さい
ために起き得る両固定床間にわたる水の循環は、図２に
示した隣接して設けられた処理槽Ｘと処理槽Ｙ間におい
ても、処理槽Ｘと処理槽Ｙ間を橋渡しする槽底部の脱窒
素流出部３と槽上部の循環硝化液流入部４における水の
移動の抵抗をできるだけ少なくすることにより容易に可
能である。The fixed bed B also has an apparent specific gravity smaller than that of water due to air bubbles trapped in the polyurethane foam granular filter medium and forms a floating layer. In addition, the water in the fixed bed B that is subjected to nitrification treatment has a higher water level in the tank than the raw water in the fixed bed A, and the porosity of the packed beds A and B is larger than the raw water in the fixed bed A. Since the water flow resistance is small, part of the treated water is automatically circulated again through the circulation nitrification solution inflow section 4 to the area of the denitrification section (fixed bed A). Since the density of water subjected to the nitrification treatment in the fixed bed B in the single treatment tank shown in FIG. 1 is smaller than that of the raw water in the fixed bed A, the circulation of water between both fixed beds can occur as shown in FIG. Even between the treatment tank X and the treatment tank Y provided adjacent to each other, the denitrification outflow part 3 at the bottom of the tank and the circulating nitrification solution inflow part 4 at the top of the tank that bridge between the treatment tank X and the treatment tank Y are shown. This is easily possible by minimizing the resistance to water movement.
【００２０】また 図１に示した単一処理槽による処理
においても、図２に示した隣接して設けられた２基の処
理槽による処理においても好適な構成としては、固定床
Ｂの中間にグレーチングＤを設けて、固定床Ｂのグレー
チングＤ以下の領域を残留ＢＯＤ除去部Ｅとした構成で
ある。この構成によると、もし固定床Ａの脱窒素部で脱
窒素反応が不十分になり、ＢＯＤの除去が悪化しても残
留ＢＯＤ除去部Ｅにおいて好気的に速やかにＢＯＤが除
去されるので、硝化部（固定床ＢのグレーチングＤの上
部）にはＢＯＤが流入することがなく、硝化反応が阻害
されることがなくなるという大きな効果を生じる。もし
残留ＢＯＤ除去部Ｅがないと、脱窒素反応悪化時に硝化
部にＢＯＤが多量に流入することになるので、硝化部に
おける優先微生物が硝化菌でなくなり、ＢＯＤ資化菌に
変わってしまうというトラブルを招き易い。In addition, in the treatment by the single treatment tank shown in FIG. 1 and the treatment by the two adjacent treatment tanks shown in FIG. The grating D is provided, and the area below the grating D of the fixed bed B is used as the residual BOD removing section E. According to this configuration, if the denitrification reaction in the denitrification section of the fixed bed A becomes insufficient and the removal of BOD deteriorates, the residual BOD removal section E aerobically and rapidly removes BOD. BOD does not flow into the nitrification part (the upper part of the grating D of the fixed bed B), which produces a great effect that the nitrification reaction is not inhibited. If there is no residual BOD removal section E, a large amount of BOD will flow into the nitrification section when the denitrification reaction worsens, so that the preferential microorganisms in the nitrification section are no longer nitrifying bacteria, but become BOD-assimilating bacteria. Easy to invite.
【００２１】本発明は 固定床に充填するろ材として、立体的網目状の粒状
物からなるろ材を特定して用い、この特定ろ材に硝化
菌、脱窒素菌などを従来より著しく高濃度（４〜５倍）
に固定することおよび、 硝化領域の下部に残留ＢＯＤ除去部を設けることが
重要なポイントである。 特にの構成は重要であり、この構成によって循環硝化
液中の溶存酸素濃度が高くても、問題なく固定床Ａ内で
脱窒素反応が進む。なぜなら、立体網目状の粒状固体か
らなるろ材の内部には溶存酸素が拡散し難いので、ろ材
の内部でＮＯX −Ｎが脱窒素菌によって効率よく脱窒素
されるからである。In the present invention, a filter medium composed of three-dimensional mesh-like particles is specified and used as a filter medium to be packed in a fixed bed, and the specific filter medium contains nitrifying bacteria, denitrifying bacteria, etc. at a significantly higher concentration (4 to 4). 5 times)
It is an important point to fix the residual BOD in the lower part of the nitrification area and to fix the residual BOD in the lower part of the nitrification area. Particularly, the configuration is important, and even if the dissolved oxygen concentration in the circulating nitrification solution is high, the denitrification reaction proceeds in the fixed bed A without any problem. This is because, in the interior of the filter material made of cubic-mesh shape of the particulate solids so hard to diffuse dissolved oxygen, because NO X -N inside the filter material is efficiently denitrification by denitrifying bacteria.
【００２２】これに対し、従来法のアンスラサイトなど
の粒状固体をろ材として使う方法および装置では、脱窒
素菌がアンスラサイトの表面にミクロンオーダーの厚み
で付着しているに過ぎないので、硝化循環液中の溶存酸
素が高いと、その影響に曝されるためＮＯX −Ｎの脱窒
素反応が進みにくい。また立体的網目状の粒状物の充填
された固定床はＳＳの捕捉容量が大きいので、目詰まり
し難く、固定床の洗浄頻度が少なくて済む。On the other hand, in the conventional method and apparatus using granular solids such as anthracite as a filter medium, the denitrifying bacteria are only attached to the surface of the anthracite in a thickness of the order of microns, so that the nitrification circulation is performed. When the dissolved oxygen in the liquid is high, denitrification of NO X -N is difficult advances because they are exposed to its influence. Further, since the fixed bed filled with the three-dimensional mesh-like particles has a large SS trapping capacity, it is less likely to be clogged and the fixed bed is washed less frequently.
【００２３】次に、本発明の固定床ＡおよびＢの洗浄方
法を図１の単一槽方式の場合を参照しつつ説明する。図
２の近接して設置された本発明の２槽構成の処理装置の
場合も単一槽方式の場合と同様に洗浄することができ
る。この洗浄方法も従来技術にはない、本発明の独自の
技術である。すなわち、運転を長時間続けた結果、固定
床Ａ内のろ材での原水ＳＳ捕捉量が増加し、またろ材に
脱窒素菌が増殖し、固定床Ａのろ過抵抗が増加するの
で、所定のろ過抵抗に達した時点で、次のような手順で
洗浄を行う。Next, the cleaning method for the fixed beds A and B of the present invention will be described with reference to the case of the single tank system of FIG. In the case of the two-tank processing apparatus according to the present invention, which is installed close to each other, as shown in FIG. This cleaning method is also a unique technique of the present invention, which is not found in the prior art. That is, as a result of continuing the operation for a long time, the amount of raw water SS trapped in the filter medium in the fixed bed A increases, and denitrifying bacteria grow in the filter medium, so that the filtration resistance of the fixed bed A increases. When the resistance is reached, washing is performed by the following procedure.
【００２４】（１）原水供給管２に付属の弁を閉じて原
水１７の供給を停止し、処理水流出管１６に付属の弁を
閉じ、洗浄排水流出管１３の弁１４を開け、槽内水位を
下げる。 （２）空洗ブロワー１２を駆動し、弁１１を開け、多量
の洗浄用空気を空洗散気管１０から吐出することによっ
て、固定床Ａ内を激しく攪乱する。次に洗浄水供給管１
５から洗浄水を供給し、固定床Ｂを通って固定床Ａに流
入させる。この操作を数十分間続けると、固定床Ａおよ
び固定床Ｂ内に捕捉されていたＳＳと増殖微生物の大部
分が洗浄排水管１４から系外に流出して行くので、その
後空洗ブロワー１２を止め、弁１１を閉じる。 （３）洗浄水供給管１５からの洗浄水の供給を停止し、
弁１４を閉じ、処理水流出管１６に付属の弁を開き、原
水供給管２に付属の弁を開いて原水１７の供給を再開す
る。 以上で洗浄操作が終了し、原水１７の処理が再開され
る。このように本発明では、固定床Ａでは強い洗浄を行
い、固定床Ｂでは弱い洗浄を行うだけでよい。(1) The valve attached to the raw water supply pipe 2 is closed to stop the supply of the raw water 17, the valve attached to the treated water outflow pipe 16 is closed, the valve 14 of the cleaning drainage outflow pipe 13 is opened, and the inside of the tank is closed. Lower the water level. (2) The air washing blower 12 is driven, the valve 11 is opened, and a large amount of washing air is discharged from the air washing diffuser 10 to violently disturb the fixed bed A. Next, wash water supply pipe 1
The washing water is supplied from 5 and flows into the fixed bed A through the fixed bed B. If this operation is continued for several tens of minutes, most of the SS and the growth microorganisms trapped in the fixed bed A and the fixed bed B flow out from the cleaning drainage pipe 14 to the outside of the system. And valve 11 is closed. (3) Stop the supply of wash water from the wash water supply pipe 15,
The valve 14 is closed, the valve attached to the treated water outflow pipe 16 is opened, the valve attached to the raw water supply pipe 2 is opened, and the supply of the raw water 17 is restarted. The washing operation is completed as described above, and the treatment of the raw water 17 is restarted. As described above, in the present invention, it is sufficient to perform strong washing on the fixed bed A and weak washing on the fixed bed B.
【００２５】[0025]
【実施例】団地下水を目開き１０ｍｍの粗目スクリーン
を通した、表１に示す水質の原水を対象にして、本発明
の処理装置を用いて処理し、本発明の効果を実証した。 表１ （原水の水質） 水温 ： １５〜１８℃ ｐＨ ： ７．２〜７．３ ＳＳ ： ８６〜１８５ｍｇ／リットル ＢＯＤ ： １５０〜２２０ｍｇ／リットル 全窒素 ： ３４〜４２ ｍｇ／リットル[Examples] The effect of the present invention was verified by treating the groundwater of the group through the coarse screen having an opening of 10 mm and treating the raw water having the water quality shown in Table 1 with the treatment apparatus of the present invention. Table 1 (Water quality of raw water) Water temperature: 15 to 18 ° C. pH: 7.2 to 7.3 SS: 86 to 185 mg / liter BOD: 150 to 220 mg / liter Total nitrogen: 34 to 42 mg / liter
【００２６】処理条件を表２に示す。 表２ （処理条件） 処理装置寸法： 寸法 ０．４ｍ×０．８ｍの角型槽を
中仕切りで０．４ｍ×０．４ｍの２槽並置型としたもの 高さ ４．５ｍ 固定床Ａの高さ ２．０ｍ 固定床Ｂの高さ ２．０ｍ 下水流量 ： ５．７６ｍ3 ／日 ろ過速度 ： ３６ ｍ／日 散気管からの空気供給量： １５ Ｎｍ3 ／日 硝化液循環量 ： ４ ｍ3 ／日 充填層Ａおよび充填層Ｂに充填するろ材はろ材の粒径が
１０×２５×２５ｍｍの角状、セル数１３のポリウレタ
ンフォームの粒状片である。Table 2 shows the processing conditions. Table 2 (Treatment conditions) Treatment equipment dimensions: Dimensions 0.4 m × 0.8 m square tank with 0.4 m × 0.4 m two tank side-by-side type with height 4.5 m fixed bed A Height 2.0 m Height of fixed bed B 2.0 m Sewage flow rate: 5.76 m 3 / day Filtration rate: 36 m / day Air supply from diffuser tube: 15 Nm 3 / day Nitrification solution circulation rate: 4 m 3 / day The filter medium to be filled in the packed bed A and the packed bed B is a granular piece of polyurethane foam having a square shape with a particle size of 10 × 25 × 25 mm and a cell number of 13.
【００２７】表２の処理条件で表１の水質の下水を１０
ヶ月間の連続処理した。通水開始後２０日間で、ポリウ
レタンフォームの粒状片のろ材に硝化菌および脱窒素
菌、ＢＯＤ資化菌が十分固定化されたので、２１日目か
ら土日を除く毎日１回、２４時間コンポジットサンプル
を採取し（土、日はサンプリングしない）、水質分析を
行った。その結果を表３に示す。 表３ （処理水水質） ｐＨ ： ６．８〜７．０ ＳＳ ： ２．０〜４．０ ｍｇ／リットル ＢＯＤ ： ３〜５ ｍｇ／リットル 全窒素 ： ８．０〜１０．０ｍｇ／リットル 表３から明らかなように、全窒素除去率７５％が安定し
て得られ、ＳＳおよびＢＯＤも著しく少ない清澄処理水
が得られた。また、ろ床の洗浄頻度は７〜８日に１回で
よく、極めて長期間のろ過継続ができた。（図２の従来
装置では１日に１回の洗浄が必要）洗浄方法としては、
前述の方法を適用したが、処理水を洗浄用水として使用
することなく、効果的な洗浄が行えた。Under the treatment conditions of Table 2, the sewage of the water quality of Table 1 was changed to 10
It was continuously treated for months. Nitrifying bacteria, denitrifying bacteria, and BOD-assimilating bacteria were sufficiently immobilized on the filter material of the polyurethane foam granules within 20 days after the start of water flow, so from the 21st day once every day except Saturday and Sunday, 24 hours composite sample Was collected (no sampling on Saturday and Sunday) and water quality analysis was performed. The results are shown in Table 3. Table 3 (Water quality of treated water) pH: 6.8 to 7.0 SS: 2.0 to 4.0 mg / liter BOD: 3 to 5 mg / liter Total nitrogen: 8.0 to 10.0 mg / liter Table 3 As is clear from the above, a clarified water having a total nitrogen removal rate of 75% was stably obtained, and SS and BOD were remarkably small. Further, the filter bed may be washed once every 7 to 8 days, and the filtration could be continued for an extremely long time. (The conventional device of FIG. 2 requires cleaning once a day) As a cleaning method,
Although the above method was applied, effective cleaning could be performed without using the treated water as cleaning water.
【００２８】[0028]
【発明の効果】本発明の装置によって有機性汚水を処理
することにより、 １．単一槽あるいは近接二槽であるので硝化・脱窒素を
行えるので装置設置スペースが少なく、ろ床の洗浄も合
理的に行える。 ２．立体網目状の粒状物からなるろ材の表面および内部
に硝化菌、脱窒素菌を高濃度に固定化したので、硝化反
応、脱窒素反応の速度が従来法におけるより３〜４倍も
大きい。 ３．ろ床の目詰まりが著しく少なく、ろ床洗浄頻度が激
減する。従って、メンテナンスが容易で洗浄排水の発生
量も少ない。 ４．エアリフト作用によって硝化液を循環できるので、
ポンプが不要である。 ５．固定床ＡとＢを同時に洗浄できるので、洗浄水の使
用量、洗浄排水の発生量が少ない。 ６．最初に沈殿池を設置する必要がなく、ＳＳの高い下
水を直接処理できるので、さらにコンパクト化できる。 以上のように、省スペース性、メンテナンス性およびろ
床洗浄の合理性の３面で優れた効果が得られた。EFFECTS OF THE INVENTION By treating organic wastewater with the apparatus of the present invention, Since it is a single tank or two adjacent tanks, nitrification and denitrification can be performed, so the equipment installation space is small and the filter bed can be cleaned reasonably. 2. Since the nitrifying bacteria and denitrifying bacteria were immobilized at a high concentration on the surface and inside of the filter medium composed of three-dimensional mesh-like particles, the rate of nitrifying reaction and denitrifying reaction was 3 to 4 times higher than in the conventional method. 3. The filter bed is not significantly clogged and the filter bed cleaning frequency is drastically reduced. Therefore, maintenance is easy and the amount of cleaning wastewater generated is small. 4. Since the nitrification liquid can be circulated by the air lift action,
No pump required. 5. Since the fixed beds A and B can be washed at the same time, the amount of washing water used and the amount of washing wastewater generated are small. 6. Since it is not necessary to install a sedimentation tank first and sewage with high SS can be directly treated, it can be made more compact. As described above, excellent effects were obtained in the three aspects of space saving, maintainability, and rationality of filter bed cleaning.
【図１】本発明の１槽式の生物学的硝化脱窒素処理槽の
１例を示す模式図。FIG. 1 is a schematic view showing an example of a one-tank type biological nitrification / denitrification treatment tank of the present invention.
【図２】本発明の１槽式の生物学的硝化脱窒素処理槽の
他の１例を示す模式図。FIG. 2 is a schematic view showing another example of the one-tank type biological nitrification and denitrification treatment tank of the present invention.
【図３】従来の２槽式の生物学的硝化脱窒素処理装置の
典型例を示す模式図。FIG. 3 is a schematic view showing a typical example of a conventional two-tank type biological nitrification / denitrification treatment apparatus.
１ 処理槽 １３ 洗浄排水管 ２ 原水供給管 １４ 弁 ３ 脱窒素液流出部 １５ 洗浄水供給管 ４ 循環硝化液流入部 １６ 処理水流出管 ５ グレーチング １７ 有機性汚水（原
水） ６ グレーチング １８ 処理水 ７ 散気管 １９ 原水供給管 ８ ガス供給管 ２０ 脱窒素ろ床 ９ ブロア ２１ 硝化ろ床 １０ 空洗散気管 ２２ 散気管 １１ 弁 ２３ 処理水槽 １２ 空洗ブロワー ２４ 洗浄水供給管 ２５ 洗浄水供給管 ３２ 循環用配管 ２６ ガス供給管 ３３ 循環用配管 ２７ 洗浄排水管 Ａ （第１）固定
床 ２８ 洗浄排水管 Ｂ （第２）固定
床 ２９ ポンプ Ｃ 中仕切り ３０ ポンプ Ｄ グレーチング ３１ 循環用配管 Ｅ ＢＯＤ除去部1 Treatment Tank 13 Washing Drainage Pipe 2 Raw Water Supply Pipe 14 Valve 3 Denitrification Liquid Outflow Portion 15 Washing Water Supply Pipe 4 Circulating Nitrification Liquid Inflow Portion 16 Treated Water Outflow Pipe 5 Grating 17 Organic Wastewater (Graining Water) 6 Grating 18 Treated Water 7 Air diffuser 19 Raw water supply pipe 8 Gas supply pipe 20 Denitrification filter 9 Blower 21 Nitrification filter 10 Air washing air diffuser 22 Air diffuser 11 Valve 23 Treated water tank 12 Air washing blower 24 Wash water supply pipe 25 Wash water supply pipe 32 Circulation Pipe 26 Gas supply pipe 33 Circulation pipe 27 Cleaning drainage pipe A (1st) fixed bed 28 Cleaning drainage pipe B (2nd) Fixed bed 29 Pump C Partition 30 Pump D Grating 31 Circulation pipe E BOD removal part
Claims (1)
網目構造をもつ粒状物を充填した固定床Ａに下向流で通
水して、生物学的脱窒素した後、隣接して設けた立体的
網目構造をもつ粒状物を充填した固定床Ｂに上向流で通
水して、生物学的硝化を行い、該固定床Ｂからの流出水
の一部を前記固定床Ａに循環せしめるように構成すると
共に、固定床Ａと固定床Ｂの下部に散気部材を設けたこ
とを特徴とする生物学的硝化脱窒素装置。1. A drainage containing ammoniacal nitrogen is passed in a downward flow to a fixed bed A filled with a granular material having a three-dimensional network structure to perform biological denitrification, and then is provided adjacently. The fixed bed B filled with the granular material having a three-dimensional network structure is subjected to upward flow to perform biological nitrification, and a part of the outflow water from the fixed bed B is circulated to the fixed bed A. A biological nitrification and denitrification apparatus having the above-mentioned configuration and provided with an aeration member below the fixed bed A and the fixed bed B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4212289A JP2601391B2 (en) | 1992-07-17 | 1992-07-17 | Biological nitrification denitrification equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4212289A JP2601391B2 (en) | 1992-07-17 | 1992-07-17 | Biological nitrification denitrification equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0647397A true JPH0647397A (en) | 1994-02-22 |
| JP2601391B2 JP2601391B2 (en) | 1997-04-16 |
Family
ID=16620135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4212289A Expired - Fee Related JP2601391B2 (en) | 1992-07-17 | 1992-07-17 | Biological nitrification denitrification equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2601391B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001259674A (en) * | 2000-03-21 | 2001-09-25 | Fuji Clean Kogyo Kk | Treating device and treating method of sewage |
| JP2012075384A (en) * | 2010-10-01 | 2012-04-19 | Taiyo Suiken:Kk | System for automatic denitrification of closed water area |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0235998A (en) * | 1988-07-22 | 1990-02-06 | Nkk Corp | Denitrification bioreactor |
| JPH02122894A (en) * | 1988-11-02 | 1990-05-10 | Nanyou Kyokai | Method and equipment for clarifying liquid utilizing foamed plastic particle |
| JPH02191594A (en) * | 1989-01-20 | 1990-07-27 | Nkk Corp | Sewage treating device |
-
1992
- 1992-07-17 JP JP4212289A patent/JP2601391B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0235998A (en) * | 1988-07-22 | 1990-02-06 | Nkk Corp | Denitrification bioreactor |
| JPH02122894A (en) * | 1988-11-02 | 1990-05-10 | Nanyou Kyokai | Method and equipment for clarifying liquid utilizing foamed plastic particle |
| JPH02191594A (en) * | 1989-01-20 | 1990-07-27 | Nkk Corp | Sewage treating device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001259674A (en) * | 2000-03-21 | 2001-09-25 | Fuji Clean Kogyo Kk | Treating device and treating method of sewage |
| JP2012075384A (en) * | 2010-10-01 | 2012-04-19 | Taiyo Suiken:Kk | System for automatic denitrification of closed water area |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2601391B2 (en) | 1997-04-16 |
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