JP3688829B2 - Wastewater treatment equipment - Google Patents

Wastewater treatment equipment Download PDF

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Publication number
JP3688829B2
JP3688829B2 JP29382896A JP29382896A JP3688829B2 JP 3688829 B2 JP3688829 B2 JP 3688829B2 JP 29382896 A JP29382896 A JP 29382896A JP 29382896 A JP29382896 A JP 29382896A JP 3688829 B2 JP3688829 B2 JP 3688829B2
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Prior art keywords
filter bed
water
carrier
aerobic
anaerobic
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JPH10128359A (en
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辰彦 鈴木
進 石川
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Maezawa Industries Inc
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Maezawa Industries Inc
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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

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  • Biological Treatment Of Waste Water (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、排水処理装置に関する。
【０００２】
【従来の技術】
固定床による排水処理法、特に好気性ろ床法は、コンパクトであり、維持管理が容易なことから、小規模な下排水処理施設に用いられることが多くなっている。好気性ろ床法で使用するろ床（好気性ろ床）として、従来は、アンスラサイト等のろ材（固定担体）のみを充填した単床式が一般的であるが、ろ床の洗浄を考慮すると、ろ材の充填高さは２ｍ程度が限界であり、上部を有効に活用することができなかった。
【０００３】
この点を改善したのが、図３に示す２床式の好気性ろ床１である。この２床式の好気性ろ床１は、アンスラサイト等のろ材２の上方に、空隙率の大きいプラスチック製接触材３を充填したものであって、このプラスチック製接触材３に微生物を保持させることにより、同じ設置面積のろ床内に多くの微生物を保持し、処理効率を向上させるようにしている。
【０００４】
一方、最近は、比較的小規模な下排水処理施設でも、窒素の除去を求められる場合が多くなり、維持管理が容易なことから、嫌気好気ろ床法による窒素除去が行われるようになってきている。
【０００５】
【発明が解決しようとする課題】
しかし、従来のろ床、特に好気性ろ床は、流入水の汚濁物質の内、主にＳＳ成分，ＢＯＤ成分の除去を目的としているので、十分な窒素除去（硝化）を行うためには、処理水量を低く抑える必要があった。２床式とすることによってある程度硝化速度を向上させることは可能なものの、ＢＯＤ酸化細菌と硝化菌とが競合関係となるため、硝化菌を安定して多量に成育させることは困難であった。したがって、通水速度を１０〜２０ｍ3 ／ｍ2 ／日程度にしなければならず、ＢＯＤ除去のための好気性ろ床と比較すると約２倍の施設容量を必要とする。
【０００６】
一方、近年、硝化菌を包括固定した担体を使用したり、硝化菌が付着し易い担体を使用したりすることによって硝化能力を高め、比較的短時間で硝化脱窒を行うことができる浮遊法が開発されている。
【０００７】
そこで本発明は、コンパクトで処理能力の高い固定床の特性を活かしつつ、硝化脱窒効率を向上させることができるろ床式の排水処理装置を提供することを目的としている。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、本発明の排水処理装置は、原水槽と、洗浄排水槽と、嫌気性ろ床と、加圧浮上分離装置と、好気性ろ床と、処理水槽とをこの順に配列し、前記洗浄排水槽は、前記原水槽からの流入原水と前記好気性ろ床の洗浄排水を貯留し、前記嫌気性ろ床は、前記洗浄排水槽からの流入原水と前記好気性ろ床で硝化処理された水の一部とが流入して、脱窒及び有機物の嫌気的分解を行い、前記加圧浮上分離装置は、前記嫌気性ろ床で嫌気性処理された水を加圧空気混合水と混合して浮上処理し、前記好気性ろ床は、前記加圧浮上分離装置で浮上処理された水を、水中に浮遊担体を投入した上部の担体浮遊部及び固定担体であるろ材を充填した下部のろ材充填部で好気処理及びろ過処理し、前記担体浮遊部の下部から前記ろ材の洗浄排水を抜きだして前記洗浄排水槽に戻す配管及び前記担体浮遊部の下部から硝化処理された水の一部を抜き出して前記嫌気性ろ床に循環させる配管を備え、前記処理水槽は、前記好気性ろ床で好気処理及びろ過処理された水が送られることを特徴とするものであって、特に、前記浮遊担体としては、硝化菌を包括固定した担体あるいは硝化菌が付着し易い担体であることが望ましい。
【０００９】
【発明の実施の形態】
以下、本発明を、図面を参照してさらに詳細に説明する。図１及び図２は、本発明の排水処理装置の一形態例を示すもので、図１は好気性ろ床部分の説明図、図２は排水処理装置全体の系統図である。
【００１０】
この好気性ろ床１０は、従来と同様の軽量骨材やアンスラサイト等の固定担体であるろ材１１を充填した槽下部のろ材充填部１２と、ろ材充填部１２より上方の槽上部の水中に浮遊担体Ａを投入した担体浮遊部１３とを有するもので、担体浮遊部１３の上方には原水流入管１４が、担体浮遊部１３の下部には担体流出防止用のウェッジワイヤースクリーン１５を備えた洗浄排水排出管１６がそれぞれ設けられ、ろ材充填部１２の下方のろ材支持層１７内にはコンプレッサー１８に接続した散気管１９が、槽底部の集水ノズル２０の下方には処理水排出管２１がそれぞれ設けられている。
【００１１】
前記浮遊担体Ａとしては、硝化菌を包括固定した担体や、硝化菌の付着しやすい担体を用いており、原水流入管１４から好気性ろ床１０内に流入した原水は、担体浮遊部１３で浮遊担体Ａと接触し、浮遊担体Ａに担持された硝化菌により硝化処理される。
【００１２】
すなわち、原水流入管１４から好気性ろ床１０内に流入した原水は、担体浮遊部１３で硝化処理され、ろ材充填部１２で好気性処理及びろ過処理された後、処理水排出管２１から排出される。
【００１３】
このとき、前記散気管１９から空気を連続的に導入して好気性ろ床１０内を所定の好気状態に維持することにより、ろ材充填部１２における好気処理（ＢＯＤ除去等）を確実に行えるとともに、担体浮遊部１３において硝化菌を安定して多量に成育させることができるので、比較的短時間で硝化処理を行うことができる。すなわち、好気性ろ床１０の上部に硝化菌を保持した担体を浮遊させて硝化処理を行うことにより、通水抵抗を増加させることなく、高い処理効率で硝化を行うことが可能となる。さらに、洗浄排水排出管１６にウェッジワイヤースクリーン１５を設けたことにより、ろ材１１を洗浄する際の洗浄排水と共に浮遊担体Ａやろ材１１が流出することを防止できる。
【００１４】
なお、槽下部のろ材充填部１２や散気管１９，集水ノズル２０等は、従来の好気性ろ床と同様の構造を採用することができるので、これらの詳細な説明は省略する。
【００１５】
廃水処理装置の一例を図２により説明すると、処理原水の流れの上流側から、スクリーン３０ａを有する原水槽３０，原水及び洗浄排水を貯留する洗浄排水槽３１，嫌気性ろ床３２，加圧浮上分離装置３３，好気性ろ床３４，処理水槽３５の順に配列したものであって、流入原水は、原水槽３０から洗浄排水槽３１を経て嫌気性ろ床３２に供給され、この嫌気性ろ床３２で嫌気処理された後、加圧浮上分離装置３３で浮上処理され、さらに、好気性ろ床３４で好気処理された後、処理水槽３５に送られる。なお、好気性ろ床３４は、図１の好気性ろ床１０に相当するものである。
【００１６】
嫌気性ろ床３２は、下部が汚泥の沈殿部で、上部に接触材を充填した形式のものであって、洗浄排水槽３１からの流入原水は、好気性ろ床３４の中段から抜出されて配管３６を介して循環する硝化液と共に、嫌気性ろ床３２の下部に沈殿している汚泥を撹拌するように供給される。この嫌気性ろ床３２では、主に、脱窒及び有機物の嫌気的分解が行われる。また、この嫌気性ろ床３２は、原則として汚泥の引抜き及びろ床の洗浄は行わず、汚泥をできるだけ長くろ床内に保持することにより、汚泥の分解を促進して減量化を図ることができる。また、この嫌気性ろ床３２には、ろ床内が過度の嫌気状態になるのを防止するための散気装置３２ａが設けられている。
【００１７】
嫌気性ろ床３２で処理された水は、リークする汚泥も含めて加圧浮上分離装置３３に送られ、配管３７から供給される加圧空気混合水と混合されて槽内に流入する。水中の懸濁成分は、加圧空気混合水から発生する微細気泡の作用によって槽上部に浮上汚泥（フロス）として浮上し、掻取機３３ａにより掻取られて汚泥貯留槽３８に送られる。
【００１８】
加圧浮上分離装置３３で浮上処理された水は、前述のように硝化菌を保持した担体が浮遊する担体浮遊部１３を有する好気性ろ床３４に原水流入管１４を介して送られる。この好気性ろ床３４では、上部の担体浮遊部１３で硝化処理された水（硝化液）の一部が、担体浮遊部１３の下部からウェッジワイヤースクリーン１５を介して洗浄排水排出管１６に抜き取られ、ポンプ３６Ｐにより配管３６に抜出されて嫌気性ろ床３２に循環し、下部のろ材充填部１２で好気処理及びろ過処理された水が処理水排出管２１から処理水槽３５に送られる。
【００１９】
また、好気性ろ床３４で発生した汚泥は、洗浄排水と共に洗浄排水排出管１６及び配管３９を介して洗浄排水槽３１に戻し、原水と共に嫌気性ろ床３２に導入して減量化した後、加圧浮上分離装置３３で処理するようにしている。したがって、通常の運転状態では、汚泥の発生個所を加圧浮上分離装置３３のみとすることができる。
【００２０】
このように、嫌気性ろ床３２，加圧浮上分離装置３３及び担体浮遊部１３を有する好気性ろ床３４を組み合わせて嫌気好気処理を行うことにより、比較的小規模な排水処理設備においても安定した状態で効率のよい窒素除去を行うことができる。特に、加圧浮上分離装置３３を用いることにより、好気性ろ床３４に送られる処理水の懸濁成分量を少なくすることができ、好気性ろ床３４の処理効率を向上させることができるとともに、余剰汚泥の発生箇所を加圧浮上分離装置３３に一本化することができるので、汚泥の処理も容易になる。さらに、嫌気性ろ床３２に散気装置３２ａを設けてろ床内の嫌気度を調節することにより、安定した状態で確実に嫌気処理を行うことができる。
【００２１】
なお、本発明の排水処理装置において、担体に保持させる菌類は、処理目的に応じて適宜に選択することができる。また、嫌気好気処理における設備構成も、上記形態例に限るものではない。
【００２２】
【発明の効果】
以上説明したように、本発明の排水処理装置によれば、処理効率を大幅に向上させることができ、小規模な下排水処理施設においても高度の処理を行うことが可能となる。
【図面の簡単な説明】
【図１】 本発明の排水処理装置に適用される好気性ろ床の一例を示す説明図である。
【図２】 本発明の排水処理装置の一形態例を示す系統図である。
【図３】 従来の好気性ろ床の一例を示す説明図である。
【符号の説明】
１０…好気性ろ床、１１…ろ材、１２…ろ材充填部、１３…担体浮遊部、１４…原水流入管、１５…ウェッジワイヤースクリーン、１６…洗浄排水排出管、１７…ろ材支持層、１８…コンプレッサー、１９…散気管、２０…集水ノズル、２１…処理水排出管、３０…原水槽、３１…洗浄排水槽、３２…嫌気性ろ床、３３…加圧浮上分離装置、３４…好気性ろ床、３５…処理水槽、３８…汚泥貯留槽、Ａ…浮遊担体[0001]
BACKGROUND OF THE INVENTION
The present invention is related to waste water treatment apparatus.
[0002]
[Prior art]
The wastewater treatment method using a fixed bed, particularly the aerobic filter bed method, is compact and easy to maintain, and thus is often used in small-scale sewage treatment facilities. As a filter bed (aerobic filter bed) used in the aerobic filter bed method, a single-bed type filled with only a filter medium (fixed carrier) such as anthracite is generally used. Then, the filling height of the filter medium was limited to about 2 m, and the upper part could not be used effectively.
[0003]
The two-bed type aerobic filter bed 1 shown in FIG. 3 has improved this point. The two-bed type aerobic filter bed 1 is obtained by filling a plastic contact material 3 having a large porosity above a filter medium 2 such as anthracite, and allows the plastic contact material 3 to hold microorganisms. Thus, a large number of microorganisms are held in the filter bed having the same installation area to improve the processing efficiency.
[0004]
On the other hand, in recent years, removal of nitrogen is often required even in relatively small sewage treatment facilities, and nitrogen is removed by an anaerobic aerobic filter method because maintenance is easy. It is coming.
[0005]
[Problems to be solved by the invention]
However, the conventional filter bed, particularly the aerobic filter bed, is mainly intended to remove SS and BOD components in the pollutant of the influent water. In order to perform sufficient nitrogen removal (nitrification), It was necessary to keep the amount of treated water low. Although it is possible to improve the nitrification rate to some extent by adopting a two-bed type, it is difficult to stably grow a large amount of nitrifying bacteria because BOD oxidizing bacteria and nitrifying bacteria are in a competitive relationship. Therefore, the water flow rate must be about 10 to 20 m 3 / m 2 / day, and the facility capacity is about twice that of an aerobic filter bed for removing BOD.
[0006]
On the other hand, in recent years, a floating method that can increase the nitrification ability by using a carrier in which nitrifying bacteria are comprehensively fixed or a carrier that easily adheres to nitrifying bacteria, and can perform nitrification denitrification in a relatively short time. Has been developed.
[0007]
Therefore, an object of the present invention is to provide a filter bed type waste water treatment apparatus capable of improving the nitrification denitrification efficiency while utilizing the characteristics of a compact and high-capacity fixed bed.
[0008]
[Means for Solving the Problems]
To achieve the above object, the waste water treatment apparatus of the present invention includes a raw water tank, the washing sump, anaerobic and filter bed, and the floatation separator, the aerobic filter bed, and a processing water tank this The washing drainage tank stores inflow raw water from the raw water tank and the washing drainage of the aerobic filter bed, and the anaerobic filter bed contains the inflow raw water from the washing drainage tank and the aerobic filter. A portion of the water nitrified in the floor flows in, denitrifies and decomposes organic matter anaerobically, and the pressurized flotation device pressurizes the anaerobic treated water in the anaerobic filter bed The aerobic filter bed is mixed with air-mixed water, and the aerobic filter bed is a filter medium that is an upper carrier floating portion and a fixed carrier in which floating carrier is poured into the water. Aerobic treatment and filtration treatment in the lower filter medium filling part filled with a filter, and washing of the filter medium from the lower part of the carrier floating part. A pipe for draining and returning to the washing drain tank and a pipe for extracting a part of the nitrified water from the lower part of the carrier floating part and circulating it to the anaerobic filter bed, Water that has been subjected to aerobic treatment and filtration treatment in an air filter bed is sent , and in particular, the floating carrier is a carrier in which nitrifying bacteria are entrapped or a carrier to which nitrifying bacteria easily adhere. It is desirable to be.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings. 1 and 2, shows one embodiment of a waste water treatment apparatus of the present invention, FIG. 1 is an explanatory view of aerobic basin portion, FIG. 2 is Ru system diagram der of the entire waste water treatment system.
[0010]
The aerobic filter bed 10 includes a filter medium filling part 12 at the bottom of the tank filled with a filter medium 11 that is a fixed carrier such as a lightweight aggregate and anthracite, and water in the upper part of the tank above the filter medium filling part 12. The carrier floating part 13 into which the floating carrier A is charged is provided. A raw water inflow pipe 14 is provided above the carrier floating part 13 and a wedge wire screen 15 for preventing carrier outflow is provided below the carrier floating part 13. A washing drainage pipe 16 is provided, a diffuser pipe 19 connected to the compressor 18 is provided in the filter medium support layer 17 below the filter medium filling part 12, and a treated water discharge pipe 21 is provided below the water collection nozzle 20 at the bottom of the tank. Are provided.
[0011]
As the floating carrier A, a carrier in which nitrifying bacteria are comprehensively fixed or a carrier to which nitrifying bacteria easily adhere is used, and the raw water flowing into the aerobic filter bed 10 from the raw water inflow pipe 14 is transferred to the carrier floating portion 13. It is contacted with the floating carrier A and is nitrified by the nitrifying bacteria carried on the floating carrier A.
[0012]
That is, the raw water flowing into the aerobic filter bed 10 from the raw water inflow pipe 14 is nitrified in the carrier floating part 13, subjected to aerobic treatment and filtration in the filter material filling part 12, and then discharged from the treated water discharge pipe 21. Is done.
[0013]
At this time, aerobic treatment (BOD removal, etc.) in the filter medium filling unit 12 is ensured by continuously introducing air from the diffuser 19 and maintaining the inside of the aerobic filter bed 10 in a predetermined aerobic state. In addition, since the nitrifying bacteria can be stably grown in a large amount in the carrier floating portion 13, the nitrification treatment can be performed in a relatively short time. That is, nitrification can be performed with high treatment efficiency without increasing water resistance by suspending a carrier holding nitrifying bacteria on the upper part of the aerobic filter bed 10 and performing nitrification treatment. Furthermore, the provision of the wedge wire screen 15 in the cleaning drainage discharge pipe 16 can prevent the floating carrier A and the filtering medium 11 from flowing out together with the cleaning drainage when cleaning the filtering medium 11.
[0014]
In addition, since the filter medium filling part 12, the diffuser pipe 19, the water collection nozzle 20, etc. of the tank lower part can employ | adopt the structure similar to the conventional aerobic filter bed, these detailed description is abbreviate | omitted.
[0015]
An example of the waste water treatment apparatus will be described with reference to FIG. 2. From the upstream side of the flow of treated raw water, a raw water tank 30 having a screen 30a, a washing drain tank 31 for storing raw water and washing waste water, an anaerobic filter bed 32, and pressurized floating The separation device 33, the aerobic filter bed 34, and the treated water tank 35 are arranged in this order. Inflow raw water is supplied from the raw water tank 30 to the anaerobic filter bed 32 through the washing drain tank 31, and this anaerobic filter bed. After being anaerobically treated at 32, it is floated at the pressurized flotation separator 33, further aerobically treated at the aerobic filter bed 34, and then sent to the treated water tank 35. The aerobic filter bed 34 corresponds to the aerobic filter bed 10 of FIG .
[0016]
The anaerobic filter bed 32 is of a type in which the lower part is a sludge sedimentation part and the upper part is filled with a contact material, and the inflow raw water from the washing drainage tank 31 is extracted from the middle stage of the aerobic filter bed 34. In addition to the nitrifying liquid circulated through the pipe 36, the sludge precipitated in the lower part of the anaerobic filter bed 32 is supplied so as to be stirred. In the anaerobic filter bed 32, denitrification and anaerobic decomposition of organic substances are mainly performed. In addition, the anaerobic filter bed 32 does not perform sludge extraction and filter bed cleaning as a general rule, and maintains sludge in the filter bed for as long as possible, thereby promoting sludge decomposition and reducing the weight. it can. The anaerobic filter bed 32 is provided with an air diffuser 32a for preventing the inside of the filter bed from becoming excessively anaerobic.
[0017]
The water treated in the anaerobic filter bed 32 is sent to the pressurized levitation separator 33 including the sludge that leaks, and mixed with the pressurized air mixed water supplied from the pipe 37 and flows into the tank. Suspended components in the water float as floating sludge (floss) in the upper part of the tank by the action of fine bubbles generated from the pressurized air mixed water, and are scraped off by the scraper 33a and sent to the sludge storage tank 38.
[0018]
The water that has been floated by the pressure floating separator 33 is sent through the raw water inflow pipe 14 to the aerobic filter bed 34 having the carrier floating portion 13 in which the carrier holding nitrifying bacteria floats as described above. In the aerobic filter bed 34, a part of the water (nitrification liquid) nitrified in the upper carrier floating part 13 is extracted from the lower part of the carrier floating part 13 to the washing drainage discharge pipe 16 via the wedge wire screen 15. Then, the water extracted from the pipe 36 by the pump 36P and circulated to the anaerobic filter bed 32 is sent to the treated water tank 35 through the treated water discharge pipe 21 from the treated water discharge pipe 21. .
[0019]
The sludge generated in the aerobic filter bed 34 is returned to the cleaning drainage tank 31 through the cleaning drainage discharge pipe 16 and the piping 39 together with the cleaning drainage, and introduced into the anaerobic filter bed 32 together with the raw water to reduce the amount. Processing is performed by the pressure levitation separator 33. Therefore, in a normal operation state, the generation site of sludge can be limited to the pressurized flotation separation device 33.
[0020]
As described above, anaerobic aerobic treatment is performed by combining the anaerobic filter bed 32, the pressurized flotation separation device 33, and the aerobic filter bed 34 having the carrier floating portion 13, thereby enabling even a relatively small-scale wastewater treatment facility. Efficient nitrogen removal can be performed in a stable state. In particular, by using the pressurized flotation separation device 33, the amount of the suspended component of the treated water sent to the aerobic filter bed 34 can be reduced, and the treatment efficiency of the aerobic filter bed 34 can be improved. Moreover, since the surplus sludge generation | occurrence | production location can be unified to the pressurization flotation separation apparatus 33, the process of sludge becomes easy. Furthermore, anaerobic treatment can be reliably performed in a stable state by providing an air diffuser 32a on the anaerobic filter bed 32 to adjust the anaerobic degree in the filter bed.
[0021]
Incidentally, Oite wastewater treatment apparatus of the present invention, fungi is retained on the carrier can be selected appropriately in accordance with processing purposes. Further, the equipment configuration in the anaerobic / aerobic process is not limited to the above-described embodiment.
[0022]
【The invention's effect】
As described above, according to the waste water treatment apparatus of the present invention, it is possible to significantly improve the processing efficiency, it becomes possible to perform a high degree of processing in small under wastewater treatment facility.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of an aerobic filter bed applied to a wastewater treatment apparatus of the present invention.
FIG. 2 is a system diagram showing one embodiment of the waste water treatment apparatus of the present invention.
FIG. 3 is an explanatory view showing an example of a conventional aerobic filter bed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Aerobic filter bed, 11 ... Filter medium, 12 ... Filter medium filling part, 13 ... Carrier floating part, 14 ... Raw water inflow pipe, 15 ... Wedge wire screen, 16 ... Washing drain discharge pipe, 17 ... Filter medium support layer, 18 ... Compressor, 19 ... Aeration pipe, 20 ... Water collection nozzle, 21 ... Treated water discharge pipe, 30 ... Raw water tank, 31 ... Washing drain tank, 32 ... Anaerobic filter bed, 33 ... Pressurized floating separator, 34 ... Aerobic Filter bed, 35 ... treated water tank, 38 ... sludge storage tank, A ... floating carrier

Claims (2)

原水槽と、洗浄排水槽と、嫌気性ろ床と、加圧浮上分離装置と、好気性ろ床と、処理水槽とをこの順に配列し、
前記洗浄排水槽は、前記原水槽からの流入原水と前記好気性ろ床の洗浄排水を貯留し、
前記嫌気性ろ床は、前記洗浄排水槽からの流入原水と前記好気性ろ床で硝化処理された水の一部とが流入して、脱窒及び有機物の嫌気的分解を行い、
前記加圧浮上分離装置は、前記嫌気性ろ床で嫌気性処理された水を加圧空気混合水と混合して浮上処理し、
前記好気性ろ床は、前記加圧浮上分離装置で浮上処理された水を、水中に浮遊担体を投入した上部の担体浮遊部及び固定担体であるろ材を充填した下部のろ材充填部で好気処理及びろ過処理し、前記担体浮遊部の下部から前記ろ材の洗浄排水を抜きだして前記洗浄排水槽に戻す配管及び前記担体浮遊部の下部から硝化処理された水の一部を抜き出して前記嫌気性ろ床に循環させる配管を備え、
前記処理水槽は、前記好気性ろ床で好気処理及びろ過処理された水が送られることを特徴とする排水処理装置。 And the raw water tank, the washing sump, anaerobic and filter bed, and the floatation separator, the aerobic filter bed, and a processing water tank arranged in this order,
The washing drainage tank stores inflow raw water from the raw water tank and washing drainage of the aerobic filter bed,
In the anaerobic filter bed, inflow raw water from the washing drainage tank and a part of the water nitrified in the aerobic filter bed flow, denitrification and anaerobic decomposition of organic matter,
The pressurized flotation separation device is a flotation treatment by mixing water that has been anaerobically treated with the anaerobic filter bed with pressurized air mixed water,
The aerobic filter bed is aerobic using water floated by the pressurized flotation separation device in an upper carrier floating part into which floating carrier is put in water and in a lower filter medium filling part filled with a filter medium as a fixed carrier. The anaerobic by extracting a part of the nitrified water from the piping and the lower part of the carrier floating part which is treated and filtered, drains the washing waste water of the filter medium from the lower part of the carrier floating part and returns to the washing drainage tank Equipped with piping to circulate through the filter bed,
The wastewater treatment apparatus , wherein the treated water tank is supplied with water that has been aerobically treated and filtered in the aerobic filter bed . 前記浮遊担体は、硝化菌を包括固定した担体あるいは硝化菌が付着し易い担体であることを特徴とする請求項１記載の排水処理装置。 2. The waste water treatment apparatus according to claim 1, wherein the floating carrier is a carrier in which nitrifying bacteria are comprehensively fixed or a carrier to which nitrifying bacteria easily adhere .
JP29382896A 1996-11-06 1996-11-06 Wastewater treatment equipment Expired - Fee Related JP3688829B2 (en)

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