JP2002119993A - Method and apparatus for treating wastewater - Google Patents
Method and apparatus for treating wastewaterInfo
- Publication number
- JP2002119993A JP2002119993A JP2000312963A JP2000312963A JP2002119993A JP 2002119993 A JP2002119993 A JP 2002119993A JP 2000312963 A JP2000312963 A JP 2000312963A JP 2000312963 A JP2000312963 A JP 2000312963A JP 2002119993 A JP2002119993 A JP 2002119993A
- Authority
- JP
- Japan
- Prior art keywords
- sulfur
- filter medium
- tank
- medium bed
- wastewater
- 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.)
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Classifications
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- 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
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排水の処理方法お
よび装置に関し、詳しくは、色度が高くまたＢＯＤ成分
に比し窒素分（アンモニア態窒素）が多い排水の処理、
特に窒素除去および脱色処理技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating wastewater, and more particularly, to the treatment of wastewater having a high chromaticity and a high nitrogen content (ammonia nitrogen) as compared with BOD components.
In particular, it relates to nitrogen removal and decolorization techniques.
【０００２】[0002]
【従来の技術】高濃度有機排水である畜産排水は、ＢＯ
Ｄ成分に比し窒素分（アンモニア態窒素）が多く、生物
学脱窒に必要な電子供与体が不足し、窒素除去が不完全
になりやすい。また、この排水はフミン質由来の着色成
分を有し、このような排水の処理、特に、窒素除去およ
び脱色は畜産排水処理における大きな課題となってい
る。2. Description of the Related Art Livestock effluents, which are high-concentration organic effluents, are BO
The nitrogen component (ammonia nitrogen) is larger than the D component, the electron donor necessary for biological denitrification is insufficient, and the nitrogen removal tends to be incomplete. In addition, this wastewater has a coloring component derived from humic substances, and treatment of such wastewater, particularly nitrogen removal and decolorization, has become a major problem in livestock wastewater treatment.
【０００３】従来から、硝酸態窒素成分を含む排水の脱
窒のために有機物ではなく、硫黄を脱窒の電子供与体と
して利用する独立栄養細菌であるThiobacillus denitri
ficans（硫黄酸化細菌の１種）を用いた脱窒が試みられ
ている（特開平１１−２９９４８１号公報）。これらは
排水を硝化槽で一旦硝化し、窒素分を硝酸態窒素に変換
した後に別の槽で硫黄脱窒を行うので、装置が大がかり
となり、また、アンモニアを硝酸にまで硝化するための
エネルギーも大きい。Hitherto, Thiobacillus denitri, an autotrophic bacterium that uses sulfur as an electron donor for denitrification, instead of organic matter, for denitrification of wastewater containing nitrate nitrogen components.
Denitrification using ficans (one of sulfur oxidizing bacteria) has been attempted (Japanese Patent Application Laid-Open No. H11-299481). Since the wastewater is once nitrified in a nitrification tank, the nitrogen content is converted into nitrate nitrogen and then sulfur denitrification is performed in another tank, the equipment becomes large, and the energy for nitrifying ammonia to nitric acid is also reduced. large.
【０００４】一方、単槽内に好気硝化床と嫌気脱窒床を
形成し、これらの間に処理水を上向流あるいは下向流で
循環させつつ、通性嫌気性の従属栄養細菌による脱窒方
法（特公昭６３−１９２３９号公報、特公平１−３７９
８８号公報、特開平８−１１９３号公報など）も提案さ
れている。On the other hand, an aerobic nitrification bed and an anaerobic denitrification bed are formed in a single tank, and treated water is circulated between the aerobic nitrification bed and the anaerobic denitrification bed by the facultative anaerobic heterotrophic bacteria. Denitrification method (JP-B-63-19239, JP-B1-379)
No. 88, Japanese Unexamined Patent Publication No. Hei 8-1193, etc.) have also been proposed.
【０００５】これらの方法においては、装置スペースは
比較的小さくなるが、上述と同様、硝酸までの硝化に要
するエネルギー消費が多く、また、前述のようなＢＯＤ
／Ｔ−Ｎ比の低い排水の脱窒を行うにはメタノールなど
の電子供与体の添加が不可欠で、この適正添加、注入量
の制御が難しく、また、余剰メタノールの除去プロセス
も必要になるという問題がある。更には、前述の硫黄酸
化細菌による脱窒処理およびこの単槽硝化、脱窒処理に
於いても排水の脱色は別途新たな脱色処理（活性炭吸着
法あるいはオゾン酸化法など）を施す必要があり、装置
スペースも大きくなり、また、処理コストも高い。[0005] In these methods, although the apparatus space is relatively small, the energy consumption required for nitrification up to nitric acid is large as described above, and the BOD as described above is used.
To denitrify wastewater with a low / TN ratio, the addition of an electron donor such as methanol is indispensable. It is difficult to control the proper addition and injection amount, and a process for removing excess methanol is required. There's a problem. Furthermore, in the above-mentioned denitrification treatment by sulfur-oxidizing bacteria and this single-tank nitrification and denitrification treatment, decolorization of wastewater requires a separate decolorization treatment (activated carbon adsorption method or ozone oxidation method, etc.). The equipment space is large, and the processing cost is high.
【０００６】[0006]
【発明が解決しようとする課題】本発明はこのような従
来技術の問題点に鑑みなされたものであって、省スペー
ス、省エネルギー性に優れ、窒素除去と脱色を同時に行
うことができる排水の単槽処理方法および装置を提供す
るものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has an excellent space-saving and energy-saving property. A tank processing method and apparatus are provided.
【０００７】[0007]
【課題を解決するための手段】本発明方法は、槽上部に
形成した好気硝化部と、硫黄とアルカリ成分を有し槽下
部に形成した脱色・脱窒部との間に排水を供給すると共
に槽内のｐＨを７．６以上に維持しつつ、所定の循環比
で処理水を前記好気硝化部から前記脱色・脱窒部に循環
し、上向流でＢＯＤ／Ｔ−Ｎ比の低い排水の処理を行う
ことを特徴とする。According to the method of the present invention, wastewater is supplied between an aerobic nitrification section formed at the upper part of a tank and a decolorizing / denitrifying part formed at the lower part of the tank having sulfur and alkali components. At the same time, the treated water is circulated from the aerobic nitrification section to the decolorization / denitrification section at a predetermined circulation ratio while maintaining the pH in the tank at 7.6 or more. It is characterized by low wastewater treatment.
【０００８】このように、単槽の好気硝化部と脱色・脱
窒部の間を循環させるので、硝化、脱窒が１槽で可能と
なり、また、槽内のｐＨを７．６以上に維持するのでア
ンモニウム態窒素濃度が１００ｍｇ／Ｌ程度以上の場合
には槽内の遊離アンモニア態窒素濃度が、約１ｍｇ/Ｌ
以上となって亜硝酸酸化（硝酸態窒素の生起）が抑制さ
れ、硝化エネルギーが小さくて済むうえ、硫黄酸化に伴
い排水の着色成分（フミン質など）が分解され、脱色が
脱窒と同時に行われる。また、この際、処理水の循環比
を２〜４程度にすると亜硝酸までの硝化、脱窒、脱色の
いずれも効率良く進む。[0008] As described above, since circulation is performed between the aerobic nitrification section and the decolorization / denitrification section of the single tank, nitrification and denitrification become possible in one tank, and the pH in the tank is increased to 7.6 or more. When the ammonium nitrogen concentration is about 100 mg / L or more, the free ammonia nitrogen concentration in the tank is about 1 mg / L.
As described above, nitrite oxidation (formation of nitrate nitrogen) is suppressed, nitrification energy is small, and coloring components (humic substances, etc.) of wastewater are decomposed by sulfur oxidation, and decolorization is performed simultaneously with denitrification. Will be At this time, when the circulation ratio of the treated water is set to about 2 to 4, all of nitrification, denitrification, and decolorization up to nitrite proceed efficiently.
【０００９】脱色・脱窒部が硫黄と炭酸カルシウムから
なる混合粒状体で形成されたものは、アルカリ成分の放
出が円滑に行われ、ｐＨが適正に維持され、その取り扱
いも容易である。In the case where the decolorizing / denitrifying portion is formed of a mixed granular material composed of sulfur and calcium carbonate, the release of the alkali component is carried out smoothly, the pH is appropriately maintained, and the handling is easy.
【００１０】本発明の排水処理装置は、処理槽の上部に
形成した固定濾材床と、下部に形成した硫黄とアルカリ
成分を保持する硫黄含有濾材床と、固定濾材床の下方に
設けられた曝気手段と、曝気手段の下方で前記硫黄含有
濾材床の上方に位置する排水供給手段と、処理槽の上部
から底部に処理水を循環させる循環手段と、処理槽の上
部に設けた処理水排出手段とからなり、上向流で色度が
高くＢＯＤ／Ｔ−Ｎ比の低い排水の処理を行うことを特
徴とする。The wastewater treatment apparatus of the present invention comprises a fixed filter medium bed formed at the upper part of the treatment tank, a sulfur-containing filter medium bed formed at the lower part for holding sulfur and alkali components, and an aeration provided below the fixed filter medium bed. Means, drainage supply means located below the aeration means below the aeration means, circulating means for circulating treated water from the top to the bottom of the treatment tank, and treated water discharge means provided at the top of the treatment tank And characterized in that wastewater having a high chromaticity and a low BOD / TN ratio is treated in an upward flow.
【００１１】本発明装置に於いては、ＤＯ（溶存酸素）
およびｐＨを維持管理することにより、亜硝酸酸化を抑
制しつつ、単槽で硝化、脱窒および脱色処理が可能とな
り、省スペース、省エネルギー性に優れた排水処理装置
を提供できる。In the apparatus of the present invention, DO (dissolved oxygen)
By maintaining and controlling pH and nitrite oxidation, nitrification, denitrification, and decolorization can be performed in a single tank while suppressing nitrite oxidation, and a wastewater treatment apparatus excellent in space saving and energy saving can be provided.
【００１２】硫黄含有濾材床を、硫黄と炭酸カルシウム
を含む粒状体から形成したものは、取り扱いが容易で、
硫黄酸化細菌の保持性に優れ、また、アルカリ成分の放
出も円滑で、ｐＨが適正値に維持される。また、亜硝酸
までの硝化に必要な最低限の曝気強度でも脱色が十分進
む場合には、固定濾材床と硫黄含有濾材床との間に浮遊
濾材床を設け、下方の硫黄含有濾材床への酸素拡散を抑
制し、硫黄含有濾材床のＤＯ濃度を低く保持することで
必要以上の硫黄酸化を抑制する。また、固定濾材床が繊
維編みチューブと不織布材からなり、浮遊濾材床が塊状
ポリウレタンフォームからなるものは、微生物保持能力
が高くしかも安価であるので実用性のある生物膜濾床を
形成できる。When the sulfur-containing filter medium bed is formed from granules containing sulfur and calcium carbonate, it is easy to handle.
Excellent retention of sulfur-oxidizing bacteria, smooth release of alkali components, and maintenance of pH at an appropriate value. Also, if decolorization proceeds sufficiently even with the minimum aeration intensity required for nitrification up to nitrous acid, a floating filter medium bed is provided between the fixed filter medium bed and the sulfur-containing filter medium bed, Oxygen diffusion is suppressed, and unnecessary sulfur oxidation is suppressed by keeping the DO concentration of the sulfur-containing filter medium low. In addition, when the fixed filter medium bed is made of a fiber knitted tube and a nonwoven fabric, and the floating filter medium bed is made of a massive polyurethane foam, it has a high ability to retain microorganisms and is inexpensive, so that a practical biofilm filter bed can be formed.
【００１３】[0013]
【発明の実施の形態】以下、本発明装置の実施形態を示
す図面に基づき、本発明装置および方法について詳細に
説明する。図１は、沈殿槽を付加した本発明の排水処理
装置の一実施形態の模式的側断面図、図２は、沈殿槽を
付加した本発明の排水処理装置の他の実施形態の模式的
断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus and method of the present invention will be described below in detail with reference to the drawings showing an embodiment of the apparatus of the present invention. FIG. 1 is a schematic side sectional view of one embodiment of a wastewater treatment apparatus of the present invention to which a sedimentation tank is added, and FIG. 2 is a schematic cross section of another embodiment of the wastewater treatment apparatus of the present invention to which a sedimentation tank is added. FIG.
【００１４】図１において、処理槽の本体１は縦型円筒
状の槽体で、底部は円錐状のホッパー１ａが形成され、
上部には、繊維編みチューブと不織布材からなる濾材を
充填した固定濾材床２が設けられている。固定濾材床２
の下方には曝気手段である円板状の散気装置３が設けら
れる。散気装置３は、槽外に設けられたブロアーあるい
はコンプレッサー（図示せず）からの空気を散気管３ａ
から供給され、空気は散気装置３の上面の多孔面から噴
出し、固定濾材床２に空気すなわち酸素を供給し、好気
層としている。In FIG. 1, a main body 1 of a processing tank is a vertical cylindrical tank body, and a bottom portion is formed with a conical hopper 1a.
At the upper part, a fixed filter medium bed 2 filled with a fiber knitted tube and a filter medium made of a nonwoven material is provided. Fixed filter media floor 2
Below, a disk-shaped diffuser 3 as an aerator is provided. The air diffuser 3 a diffuses air from a blower or a compressor (not shown) provided outside the tank.
From the porous surface of the upper surface of the diffuser 3 to supply air, that is, oxygen, to the fixed filter medium bed 2 to form an aerobic layer.
【００１５】本体１の下部でホッパー１ａの上には、硫
黄と炭酸カルシウムからなる粒状物（以下硫黄含有濾材
という）を充填した硫黄含有濾材床４が形成される。こ
の粒状物は、例えば、特開平１１−２８５３７７号公報
に記載の組成物が好適に用いられるが、硫黄とアルカリ
成分を含んでおれば、適宜の粒状物を充填して硫黄含有
濾材床４を形成することができる。A sulfur-containing filter medium bed 4 filled with particulate matter (hereinafter referred to as a sulfur-containing filter medium) composed of sulfur and calcium carbonate is formed below the main body 1 and above the hopper 1a. As the granules, for example, a composition described in JP-A-11-285377 is suitably used. If the granules contain sulfur and an alkali component, the granules are filled with appropriate granules to form the sulfur-containing filter medium bed 4. Can be formed.
【００１６】排水供給手段である、ポンプ５ａを有する
排水供給管５は、硫黄含有濾材床４の上方で本体１の側
壁に開口し、ここから排水を供給する。循環手段であ
る、ポンプ６ａを有する処理水の循環管６は、固定濾材
床２の上の槽本体１の側壁から下部ホッパー１ａの底部
につながり、所定の量の処理水をポンプ６ａにより循環
させる。循環管６には、処理水の排出手段である排出管
７が結合され、供給排水に対応する量の処理水を排出管
７から溢流により底部にホッパー８ａを有する沈殿槽８
に導入する。沈殿槽８の上澄水は溢流管８ｂから処理水
として取り出される。A drainage supply pipe 5 having a pump 5a, which is a drainage supply means, opens to the side wall of the main body 1 above the sulfur-containing filter medium bed 4, and supplies drainage from here. A circulating pipe 6 for treating water having a pump 6a, which is a circulating means, is connected from the side wall of the tank body 1 on the fixed filter medium bed 2 to the bottom of the lower hopper 1a, and circulates a predetermined amount of treated water by the pump 6a. . The circulation pipe 6 is connected with a discharge pipe 7 serving as a means for discharging treated water, and a settling tank 8 having a hopper 8a at the bottom by overflowing treated water of an amount corresponding to supply and drainage from the discharge pipe 7.
To be introduced. The supernatant water of the settling tank 8 is taken out from the overflow pipe 8b as treated water.
【００１７】次ぎに本排水処理装置を用いた排水処理方
法について説明する。排水処理に先立ち、畜産排水処理
施設の活性汚泥を基に硝化菌を固定濾材に馴養、馴致し
て付着させ、豚舎汚水をＨＲＴ２日でＵＡＳＢ処理した
排水を、供給管５から供給し、処理水を循環管６で循環
させつつ、硫黄含有濾材床４のＤＯを低レベルに維持
し、硫黄含有濾床に硫黄酸化菌を馴養、馴致し、各濾床
に微生物相が安定した後、排水の処理を行う。Next, a wastewater treatment method using the wastewater treatment apparatus will be described. Prior to the wastewater treatment, nitrifying bacteria are acclimated to the fixed filter medium based on the activated sludge of the livestock wastewater treatment facility, adhered to the fixed filter medium, and the wastewater obtained by subjecting the swine sewage to UASB treatment in two days of HRT is supplied from the supply pipe 5, and treated water is treated. Is maintained in the sulfur-containing filter medium bed 4 at a low level while the sulfur oxidizing bacteria are acclimated to the sulfur-containing filter bed, and the microflora is stabilized in each filter bed. Perform processing.
【００１８】本発明方法においては、硫黄含有濾材の充
填量は、槽内のｐＨが７．６以上となるように定め、処
理水の循環比（処理水循環量／排水供給量）は２〜４に
する。ここに、槽内のｐＨを硫黄含有濾材から放出され
るアルカリ成分により７．６以上に保持するのでアンモ
ニア態窒素濃度が１００ｍｇ/Ｌ程度以上の場合遊離ア
ンモニア態窒素濃度が１ｍｇ/Ｌ以上のレベルに保持さ
れ、亜硝酸酸化が抑制され、硝化に消費される酸素が少
なくなり曝気に要するエネルギーが低くなる。また、低
いＤＯレベルに維持された硫黄含有濾材床の下部では、
硫黄酸化細菌による脱窒が行われると共に硫黄酸化細菌
の硫黄酸化反応に伴って、硫黄含有濾材床の全層で排水
中のフミン質その他の着色成分が分解され、排水の脱色
も同時に行われる。なお、ｐＨは８．５を越えると、処
理水の放流に適さないのでｐＨ８．５以下に保持するの
が好ましい。In the method of the present invention, the filling amount of the sulfur-containing filter medium is determined so that the pH in the tank becomes 7.6 or more, and the circulation ratio of treated water (circulated amount of treated water / supplied amount of wastewater) is 2 to 4. To Here, since the pH in the tank is maintained at 7.6 or more by an alkali component released from the sulfur-containing filter medium, the concentration of free ammonia-nitrogen is 1 mg / L or more when the concentration of ammonia-nitrogen is about 100 mg / L or more. , Nitrite oxidation is suppressed, oxygen consumed for nitrification is reduced, and energy required for aeration is reduced. Also, at the bottom of the sulfur-containing filter media bed, which was maintained at a low DO level,
In addition to the denitrification by the sulfur-oxidizing bacteria, the humic substances and other coloring components in the wastewater are decomposed in all layers of the sulfur-containing filter medium bed along with the sulfur oxidation reaction of the sulfur-oxidizing bacteria, and the wastewater is simultaneously decolorized. If the pH exceeds 8.5, it is not suitable for discharging treated water, so it is preferable to keep the pH at 8.5 or less.
【００１９】図１の実施形態の装置においては、脱色を
促進するため硫黄含有濾材床４の上部のＤＯを１．５ｍ
ｇ／Ｌ程度以上に保ち、硫黄含有濾材床４の下部は脱窒
を阻害しないレベル以下のＤＯに維持する。ここで、さ
らに、脱色性能を高めるためには図１の装置において曝
気量を上昇させ、硫黄含有濾材床上部のＤＯを高め、硫
黄酸化を促進させることもできる。In the apparatus of the embodiment shown in FIG. 1, the DO above the sulfur-containing filter medium bed 4 is 1.5 m in order to promote decolorization.
g / L or more, and the lower part of the sulfur-containing filter medium bed 4 is maintained at a DO below a level that does not inhibit denitrification. Here, in order to further enhance the decolorization performance, the amount of aeration can be increased in the apparatus shown in FIG. 1 to increase the DO above the sulfur-containing filter medium bed, thereby promoting sulfur oxidation.
【００２０】なお、亜硝酸までの硝化に必要な最低限の
曝気強度でも脱色が十分に進む場合には硫黄含有濾材床
上部への酸素拡散を抑制することで硫黄濾材の必要以上
の消耗を防ぐようにした方がよい。硫黄含有濾材床への
酸素拡散を防ぐには、図２に示す実施形態のように、硫
黄含有濾材床４Ａの上部にポリウレタンフォームからな
る浮遊濾材を充填した浮遊濾材床９を配置しても良い。
なお、図２のものは、浮遊濾材床９を配置し、硫黄含有
濾材床４Ａの厚みを薄くした以外は図１のものと同様で
あり、図１と同じ機能のものは同じ符号を付し、説明は
省略する。If decolorization proceeds sufficiently even with the minimum aeration intensity required for nitrification up to nitrous acid, unnecessary consumption of the sulfur filter medium is prevented by suppressing oxygen diffusion to the upper part of the sulfur-containing filter medium bed. It is better to do so. In order to prevent diffusion of oxygen to the sulfur-containing filter medium bed, a floating filter medium bed 9 filled with a floating filter medium made of polyurethane foam may be disposed above the sulfur-containing filter medium bed 4A as in the embodiment shown in FIG. .
2 is the same as that of FIG. 1 except that the floating filter medium bed 9 is arranged and the thickness of the sulfur-containing filter medium bed 4A is reduced, and those having the same functions as those of FIG. The description is omitted.
【００２１】以上の説明に於いては、炭酸カルシウムを
含む硫黄濾材を用い、アルカリ成分を補填したが、硫黄
含有濾材床では、塊状の単純硫黄を用い、カルシウムを
含み徐々に溶解する粒状物を混合してもよい、また、ア
ルカリ成分は、苛性ソーダあるいは苛性カリなどのアル
カリ溶液を適宜注入し、槽内のｐＨを制御維持すること
もできる。しかし、硫黄と炭酸カルシウムの混合造粒物
を用いるのが簡便であり、濾床としても安定する。In the above description, a sulfur filter medium containing calcium carbonate was used to supplement the alkali component. However, in a sulfur-containing filter medium bed, simple bulk sulfur was used to remove particulate matter containing calcium and gradually dissolving. The alkali component may be mixed, and the pH in the tank may be controlled and maintained by appropriately injecting an alkali solution such as caustic soda or potassium caustic. However, it is convenient to use a mixed granulated product of sulfur and calcium carbonate, and it is stable as a filter bed.
【００２２】[0022]
【実施例】前述の図２の処理装置を用いて、排水処理を
行った実施例を述べ、比較例との比較において本発明の
効果を説明する。装置の容積は、槽本体２８Ｌ、固定濾
材床１０Ｌ、硫黄含有濾材床２．５Ｌ、浮遊濾材床１０
Ｌであり、被処理水として豚舎排水をＨＲＴ２日のＵＡ
ＳＢで処理した排水（表１に示す）を用い、この排水を
２０°Ｃに維持した処理槽に導き、ＨＲＴ２日（流入排
水量：０．５４Ｌ／日）にし、循環比８（比較例）、４
（実施例）、２（実施例）、１（比較例）、０（比較
例）と変化させて、比較例と併せて実施例の処理を行っ
た。結果を表２に示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which wastewater treatment is performed using the above-described processing apparatus of FIG. 2 will be described, and the effect of the present invention will be described in comparison with a comparative example. The capacity of the apparatus is as follows: tank body 28L, fixed filter medium bed 10L, sulfur-containing filter medium bed 2.5L, floating filter medium bed 10L.
L, and the pork sewage drainage was treated as UA
Using the wastewater treated with SB (shown in Table 1), the wastewater was led to a treatment tank maintained at 20 ° C., HRT was set to 2 days (inflow wastewater amount: 0.54 L / day), and the circulation ratio was 8 (comparative example). 4
(Example) The processing of the example was performed in combination with the comparative example, changing to 2 (example), 1 (comparative example), and 0 (comparative example). Table 2 shows the results.
【表１】 [Table 1]
【表２】 この結果から、循環比２〜４レベルにおいて、窒素除去
が促進され、また、硫酸イオンが比較多量に生じ、脱色
性能が良く発現するのが理解できる。なお、以上の本発
明の説明に於いては、窒素除去と脱色に重点を置いて説
明したが、本発明方法および装置においては、窒素除去
と脱色が行われると同時に、各汚濁成分（ＢＯＤ、ＣＯ
Ｄ成分）も同時に顕著に除去されることは上記結果から
明らかである。[Table 2] From these results, it can be understood that nitrogen removal is promoted at a circulating ratio of 2 to 4, and a relatively large amount of sulfate ions is generated, so that the decolorization performance is well exhibited. In the above description of the present invention, the emphasis has been given to nitrogen removal and decolorization. However, in the method and apparatus of the present invention, nitrogen removal and decolorization are performed, and at the same time, each of the pollutants (BOD, CO
It is clear from the above results that D component) is also significantly removed at the same time.
【００２３】各表中の、ｐＨはｐＨ計で測定し、Ｃｏｌ
ｏｒ（Ｕ）(着色度)は、１５０００ｒｐｍ、５分間遠心
分離して懸濁物を除去した後、着色度計（ＮＤＲ−２０
００、日本電色工業社）で測定した。ＢＯＤはＨＡＣＫ
社のＢＯＤ ＴＲＡＣＫ自動測定器を用いて５日法によ
り、ＴＣＯＤｃｒはＨＡＣＫ社の重クロム酸法ＣＯＤ測
定システム（ＤＲ／７００Colorimeter & ＣＯＤ React
or）を用いて測定した。Ｔ−Ｎ（全窒素）およびＴ−Ｐ
（全リン）はサヌキ工業製フローインジェクション分析
装置（Ｔ−Ｎ／Ｔ−Ｐ計）を用い、Ｔ−Ｎは、１４０°
Ｃ過硫酸カリウム分解の後塩酸酸性下での吸光度によ
り、Ｔ−Ｐは、１４０°Ｃ過硫酸カリウム分解の後モリ
ブデンブルー法による880ｎｍ吸光度測定により定量し
た。ＮＨ４−Ｎはフローインジェクション法（Aquatec
５４００ Analyzer Foss Tecator、ＡＱＵＡＴＥＣ社）
により測定、ＮＯ３−Ｎ、ＮＯ２−Ｎ、ＰＯ４−Ｐおよ
びＳＯ４−Ｓは、試料を５０倍に希釈し、ミリポアＨＡ
フィルターで濾過してからイオンクロマトグラフィー
（ＩＣ７０００、Yokogawa社）で分析した。In each table, the pH was measured with a pH meter,
or (U) (degree of coloration) was measured by centrifugation at 15000 rpm for 5 minutes to remove a suspension, and then a colorimeter (NDR-20)
00, Nippon Denshoku Industries Co., Ltd.). BOD is HACK
According to the 5-day method using a BOD TRACK automatic measuring device of HACK Co., Ltd., TCODcr is a COD measuring system of a dichromic acid method of HACK (DR / 700 Colorimeter & COD React).
or). TN (total nitrogen) and TP
(Total phosphorus) used a Sanuki Kogyo flow injection analyzer (TN / TP meter), TN was 140 °
After decomposing potassium persulfate, the TP was determined by the absorbance under hydrochloric acid acidity, and TP was quantified by decomposing potassium persulfate at 140 ° C and measuring absorbance at 880 nm by the molybdenum blue method. NH4-N is a flow injection method (Aquatec
5400 Analyzer Foss Tecator, AQUATEC)
NO3-N, NO2-N, PO4-P and SO4-S were prepared by diluting the sample 50-fold with Millipore HA
After filtration through a filter, analysis was performed by ion chromatography (IC7000, Yokogawa).
【００２４】[0024]
【発明の効果】本発明方法によれば、槽上部に形成した
好気硝化部と、硫黄とアルカリ成分を有し槽下部に形成
した脱色・脱窒部との間に排水を供給すると共に槽内の
ｐＨを７．６以上に維持しつつ、所定の循環比で処理水
を好気硝化部から脱窒部に循環し、上向流でＢＯＤ／Ｔ
−Ｎ比の低い排水の処理を行うので、メタノールのよう
な炭素源の添加が不要で、維持管理も容易であり、硝化
エネルギーも少なく、省スペースな装置で脱窒と脱色を
同時に行うことができ、特にＢＯＤ／Ｔ−Ｎ比の低い着
色排水に好適な処理方法、装置である。According to the method of the present invention, waste water is supplied between the aerobic nitrification section formed at the upper part of the tank and the decolorizing / denitrifying part formed at the lower part of the tank containing sulfur and alkali components. While maintaining the internal pH at 7.6 or more, the treated water is circulated from the aerobic nitrification section to the denitrification section at a predetermined circulation ratio, and BOD / T flows upward.
Since the wastewater with a low -N ratio is treated, the addition of a carbon source such as methanol is unnecessary, the maintenance is easy, the nitrification energy is small, and the denitrification and decolorization can be performed simultaneously with a space-saving device. The present invention is a treatment method and an apparatus suitable for colored wastewater having a low BOD / TN ratio.
【図１】沈殿槽を付加した本発明の排水処理装置の一実
施形態の模式的側断面図。FIG. 1 is a schematic side sectional view of one embodiment of a wastewater treatment apparatus of the present invention to which a sedimentation tank is added.
【図２】沈殿槽を付加した本発明の排水処理装置の他の
実施形態の模式的側断面図。FIG. 2 is a schematic side sectional view of another embodiment of the wastewater treatment apparatus of the present invention to which a sedimentation tank is added.
１ 処理槽本体 ２ 固定濾材床 ３ 散気装置（曝気手段） ４、４Ａ 硫黄含有濾材床 ５ 排水供給管（排水供給手段） ６ 循環管（循環手段） ７ 排出管（排出手段） ８ 沈殿槽 ９ 浮遊濾材床 REFERENCE SIGNS LIST 1 treatment tank main body 2 fixed filter medium bed 3 diffuser (aeration means) 4, 4A sulfur-containing filter medium bed 5 drainage supply pipe (drainage supply means) 6 circulation pipe (circulation means) 7 discharge pipe (discharge means) 8 sedimentation tank 9 Floating filter media floor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 康男 茨城県つくば市松代４丁目26番地412−101 Ｆターム(参考） 4D003 AA01 AB02 BA02 BA04 CA03 DA04 DA11 EA15 EA18 EA19 EA30 FA06 4D040 BB05 BB42 BB57 BB82 BB91 DD03 DD31 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuo Tanaka 4-26-1, Matsushiro, Tsukuba-shi, Ibaraki 412-101 F-term (reference) 4D003 AA01 AB02 BA02 BA04 CA03 DA04 DA11 EA15 EA18 EA19 EA30 FA06 4D040 BB05 BB42 BB57 BB82 BB91 DD03 DD31
Claims (7)
ルカリ成分を有し槽下部に形成した脱色・脱窒部との間
に排水を供給すると共に槽内のｐＨを７．６以上に維持
しつつ、所定の循環比で処理水を前記好気硝化部から前
記脱色・脱窒部に循環し、上向流で色度が高くＢＯＤ／
Ｔ−Ｎ比の低い排水の処理を行うことを特徴とする排水
処理方法。1. A wastewater is supplied between an aerobic nitrification section formed at an upper portion of a tank and a decolorization / denitrification section formed at a lower portion of the tank having sulfur and alkali components and the pH in the tank is adjusted to 7.6. While maintaining the above, the treated water is circulated from the aerobic nitrification section to the decolorization / denitrification section at a predetermined circulation ratio, and the BOD /
A wastewater treatment method characterized by treating wastewater having a low TN ratio.
からなる粒状体で形成された請求項１に記載の排水処理
方法。2. The wastewater treatment method according to claim 1, wherein the decolorizing / denitrifying portion is formed of a granular material comprising sulfur and calcium carbonate.
または２に記載の排水処理方法。3. The system according to claim 1, wherein said circulation ratio is 2 or more and 4 or less.
Or the wastewater treatment method according to 2.
部に形成した硫黄とアルカリ成分を保持する硫黄含有濾
材床と、前記固定濾材床の下方に設けられた曝気手段
と、該曝気手段の下方で前記硫黄含有濾材床の上方に位
置する排水供給手段と、処理槽の上部から底部に処理水
を循環させる循環手段と、処理槽の上部に設けた処理水
排出手段とからなり、上向流で色度が高くＢＯＤ／Ｔ−
Ｎ比の低い排水の処理を行うことを特徴とする排水処理
装置。4. A fixed filter medium bed formed at the upper part of the treatment tank, a sulfur-containing filter medium bed formed at the lower part for holding sulfur and alkali components, aeration means provided below the fixed filter medium bed, A wastewater supply means located below the means and above the sulfur-containing filter medium bed, a circulation means for circulating treated water from the top of the treatment tank to the bottom, and a treated water discharge means provided at the top of the treatment tank; High chromaticity with upward flow BOD / T-
A wastewater treatment device for treating wastewater having a low N ratio.
ウムを含む粒状体から形成した請求項４に記載の排水処
理装置。5. The wastewater treatment apparatus according to claim 4, wherein the sulfur-containing filter medium bed is formed of a granular material containing sulfur and calcium carbonate.
間に浮遊濾材床を設けた請求項４または５に記載の排水
処理装置。6. The wastewater treatment apparatus according to claim 4, wherein a floating filter medium bed is provided between the fixed filter medium bed and the sulfur-containing filter medium bed.
布材からなり、前記浮遊濾材床が塊状ポリウレタンフォ
ームからなる請求項６に記載の排水処理装置。7. The wastewater treatment apparatus according to claim 6, wherein said fixed filter medium bed is made of a fiber knitted tube and a non-woven material, and said floating filter medium bed is made of a massive polyurethane foam.
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| JP2002159993A (en) * | 2000-11-27 | 2002-06-04 | Nitchitsu Co Ltd | Nitric acid removal treatment equipment |
| KR20020081175A (en) * | 2002-09-24 | 2002-10-26 | 임광희 | Package type-multistage reactor combining the upper part of aerobic fluidized biofilm process and the lower part of anoxic process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002159993A (en) * | 2000-11-27 | 2002-06-04 | Nitchitsu Co Ltd | Nitric acid removal treatment equipment |
| KR20020081175A (en) * | 2002-09-24 | 2002-10-26 | 임광희 | Package type-multistage reactor combining the upper part of aerobic fluidized biofilm process and the lower part of anoxic process |
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| JP2005095758A (en) * | 2003-09-24 | 2005-04-14 | National Agriculture & Bio-Oriented Research Organization | Method and apparatus for treating water containing inorganic-state nitrogen or phosphorus |
| JP2006305531A (en) * | 2005-03-29 | 2006-11-09 | Sanwa Seisakusho:Kk | Method and apparatus for treating organic waste |
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| CN116239220A (en) * | 2022-09-07 | 2023-06-09 | 北京工业大学 | Device and method for synchronously treating acrylic fiber wastewater and domestic sewage by combining sulfur oxidation whole-course nitrification with short-range denitrification anaerobic ammoxidation |
| CN116239220B (en) * | 2022-09-07 | 2024-04-26 | 北京工业大学 | Device and method for synchronously treating acrylic fiber wastewater and domestic sewage by combining sulfur oxidation whole-course nitrification with short-range denitrification anaerobic ammoxidation |
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