JP3721004B2 - Biological water treatment apparatus and biological water treatment method - Google Patents

Biological water treatment apparatus and biological water treatment method Download PDF

Info

Publication number
JP3721004B2
JP3721004B2 JP10652799A JP10652799A JP3721004B2 JP 3721004 B2 JP3721004 B2 JP 3721004B2 JP 10652799 A JP10652799 A JP 10652799A JP 10652799 A JP10652799 A JP 10652799A JP 3721004 B2 JP3721004 B2 JP 3721004B2
Authority
JP
Japan
Prior art keywords
carrier
tank
water treatment
water
biological
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.)
Expired - Fee Related
Application number
JP10652799A
Other languages
Japanese (ja)
Other versions
JP2000296396A (en
Inventor
安彦 猿渡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shinko Pantec Co Ltd
Original Assignee
Kobelco Eco Solutions Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobelco Eco Solutions Co Ltd filed Critical Kobelco Eco Solutions Co Ltd
Priority to JP10652799A priority Critical patent/JP3721004B2/en
Publication of JP2000296396A publication Critical patent/JP2000296396A/en
Application granted granted Critical
Publication of JP3721004B2 publication Critical patent/JP3721004B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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)

Description

【０００１】
【発明の属する技術分野】
本発明は、担体に固定化された微生物を用いて廃水を浄化処理する生物学的水処理装置および生物学的水処理方法に関し、より詳しくは担体の舞上げ現象の発生を防止し、スクリーンを用いるまでもなく担体の流出を防止することを可能ならしめるようにした生物学的水処理装置および生物学的水処理方法の技術分野に属するものである。
【０００２】
【従来の技術】
微生物を用いて廃水を浄化処理するようにした水処理装置および水処理方法としては硝化脱窒装置を活用するものが知られている。そして、このような水処理装置および水処理方法のうち微生物が固定化された担体を沈降分離するようにしたものとしては、例えば特開平５−２６１３９３号公報、および特開平９−７５９９４号公報に開示されてなるものが公知である。以下、これらの硝化脱窒装置の概要を順次説明する。
【０００３】
先ず、特開平５−２６１３９３号公報に開示されてなる従来例１に係る水処理方法を実施する水処理装置の概要を、その工程図の図６を参照しながら説明すると、この水処理装置は、脱窒工程２、微生物が固定化された担体を用いる硝化工程３および汚泥分離工程７の各工程で順次処理されてなる生物学的硝化脱窒方法により廃水を処理するもので、硝化工程３での担体４を担体沈降工程１２で沈降分離して、担体分離装置である液体サイクロン１５に導いて担体が分離された分離液をサイクロンオーバーフロー配管１６を介して脱窒皇帝２へ循環させると共に、前記液体サイクロン１５で回収した担体４をサイクロンアンダーフロー配管１７を介して前記硝化工程３に返送するようにしたものである。
【０００４】
次に、特開平９−７５９９４号公報に開示されてなる従来例２に係る水処理装置の概要を、その構成説明図の図７を参照しながら説明すると、硝化槽２６から受入槽４８に硝化液に同伴して流出した浮遊活性汚泥と担体２４は、下降流路５４により下降して、浮遊活性汚泥と担体２４との比重差を利用して担体２４を沈降分離させる分離室５６に流入するようになっている。そして、この分離室５６の底部に沈降して分離された担体２４は、分離室５６内の下層液を取水して硝化槽２６に送水する送水管５８を流れて硝化槽２６に戻されるが、その際にはエアリフトにより送水管５８の流れが形成されるため担体２４が破壊されるようなことがない。一方、浮遊活性汚泥は、分離室５６の上層液と共に、被処理水をオーバーフローさせるトラフ７０を介して汚泥沈殿槽１８に送られるように構成されている。
【０００５】
【発明が解決しようとする課題】
上記従来例１または２に係る水処理装置はそれなりに有用であると考えられるが、これら装置にはそれぞれ下記に説明するような解決すべき課題がある。先ず担体沈降工程（以下、担体分離装置という。）有する従来例１については、この担体分離装置の後工程側にサイクロンやスクリーンを付加するものとなっているので、付加設備の製造コストや維持管理の労力を要するという経済上ならびにメンテナンス（目詰まりのための定期的清掃）上の解決すべき課題が生じる。
【０００６】
スクリーンや担体分離装置が不要な従来例２については、担体を含む被処理水を担体沈降分離槽（分離室）へ流入させるときに、下降流が生じるように構成されているので、担体の舞上げ現象が生じ、浮遊活性汚泥と共に担体がトラフを介して汚泥沈殿槽に流出する恐れがある。汚泥沈殿槽への担体の流出を防止するためには、後工程にスクリーンや担体分離装置が必要になるので、結果的にコストアップにつながるという経済上の解決すべき課題が生じる。
【０００７】
従って、本発明の目的は、担体の舞上げ現象の発生を防止し、スクリーンを用いるまでもなく担体の流出を防止することを可能ならしめる生物学的水処理装置および生物学的水処理方法を提供することである。
【０００８】
【課題を解決するための手段】
上記課題を解決するために、本発明の請求項１に係る生物学的水処理装置が採用した手段は、有機物や窒素成分を分解する微生物が固定化された担体を用いた生物学的方法により廃水を処理する生物学的水処理装置において、反応タンクと、担体沈降分離槽とを備え、前記担体沈降分離槽は、前記反応タンクから排水された担体を含む被処理水を流入させる複数の流入部と、担体を分離させた分離水を排水する排水部とを備えると共に、前記流入部が前記被処理水を分散流として、前記排水部よりも下側位置であって、かつこの担体沈降分離槽内の相対する水平方向に流入させるように構成されてなることを特徴とするものである。
【０００９】
本発明の請求項２に係る生物学的水処理装置が採用した手段は、請求項１に記載の生物学的水処理装置において、前記反応タンクから排水された担体を含む被処理水が、前記担体沈降分離槽の近傍に設けられた流入水集合管を介して前記流入部から前記担体沈降分離槽へ流入するように構成されてなることを特徴とするものである。
【００１０】
本発明の請求項３に係る生物学的水処理方法が採用した手段は、有機物や窒素成分を分解する微生物が固定化された担体を用い、廃水を反応タンクおよび担体沈降分離槽を順次経由させて処理する生物学的水処理方法において、前記反応タンクから前記担体沈降分離槽に前記担体を含む被処理水を、複数の流入部から分散流として前記担体沈降分離槽内の相対する水平方向に流入させ、前記担体沈降分離槽で担体と分離された分離水をこの担体沈降分離槽内の担体を含む被処理水の流入位置よりも上位位置に設けた排水部から排水させることを特徴とするものである。
【００１１】
本発明の請求項４に係る生物学的水処理方法が採用した手段は、請求項３に記載の生物学的水処理方法において、前記担体を含む被処理水を、前記担体沈降分離槽の近傍に設けた流入水集合管を介して前記流入部から担体沈降分離槽へ流入させることを特徴とするものである。
【００１２】
【発明の実施の形態】
以下、本発明の生物学的水処理方法を実現する実施の形態１に係る生物学的水処理装置を、そのフロー図の図１と、担体沈降分離槽の模式的断面図の図２（ａ）と，図２（ａ）のＢ−Ｂ線断面図の図２（ｂ）とを参照しながら説明する。
【００１３】
図１に示す符号１は本発明の実施の形態１に係る生物学的水処理装置である。この生物学的水処理装置１は、有機物や窒素成分（アンモニア態窒素成分、有機態窒素成分等）を含む下水のような廃水を１次処理した１次処理水が流入し、内側に短絡流防止用区画壁２１ａを有する脱窒槽２１、およびこの脱窒槽２１の後工程側に設けられ、内側に阻流壁２２ａを有する硝化槽２２からなる反応タンク２と、この反応タンク２の硝化槽２２から有機物や窒素成分を分解する微生物が固定化されてなる担体１０を含む被処理水が、流入部である後述する位置に設けられた流入口４ａに流入管３を介して流入する後述する構成になる担体沈降分離槽４と、この担体沈降分離槽４から前記担体１０が分離された分離水が後述する排水部５を介して流出し、分離水流出管６を介して流入する最終沈殿池７とを備えている。
【００１４】
前記流入管３は、図２に示すように、前記硝化槽２２に一端側が連結されてなる２本の平行な流入管３，３のそれぞれが、断面が矩形状に形成されてなる担体沈降分離槽４の上下方向の一側壁の下側から略１／３程度の高さ位置に設けられた流入口４ａに水平に連通している。そして、この担体沈降分離槽４内において、担体１０を含む被処理液を分散流として相対する水平方向に流出させる複数の流出孔３′が設けられてなる構成になっている。また、この担体沈降分離槽４の排水部５は、前記流入管３の連通位置よりも上位位置に設けられており、これは越流堰５ａと、この越流堰５ａを越えて流出した分離水が瀧状になって流下するトラフ５ｂとからなっている。なお、図２（ａ）においては、流出孔３′から流出する分散流の向きを示す矢印が下向きになっているが、図２（ｂ）から良く理解されるように、これは変位図示であって、矢印の実際の向きは同図面の直角方向である。また、担体沈降分離槽４の流入管３が連通する流入口４ａの位置は、種々の流入試験の結果に基づいて決定したものである。
【００１５】
そして、前記トラフ５ｂから分離水が分離水流出管６を介して最終沈殿池７に流入すると共に、分離水流出管６から分岐した硝化液循環管９を介して分離水の一部が前記反応タンク２の脱窒槽２１の上流側に戻される。次いで、前記担体沈降分離槽４の槽底に沈殿した担体１０は、被処理水である硝化液の一部と共に担体戻し管８を介して前記反応タンク２の硝化槽２２の上流側に戻されるように構成されている。
【００１６】
担体１０を硝化液の一部と共に担体戻し管８を介して脱窒槽２１の上流側に戻す担体戻しポンプ８ａは、図２に示すように、担体１０を含む硝化液に空気を送気して小比重にして上昇させる、いわゆるエアリフト形式になるものである。このようなエアリフト形式の担体戻しポンプ８ａを採用したのは、担体１０の破損防止を狙いとしたものである。
【００１７】
以下、本発明の実施の形態１に係る生物学的水処理装置１の作用態様を説明すると、硝化槽から担体１０を含む被処理水が流入管３、流入口４ａを介して、複数の流出孔３′から担体沈降分離槽４内に流入するが、流入口４ａの位置は、排水部５より低位置、つまりこの担体沈降分離槽４の上下方向の略１／３程度の高さ位置であり、そして担体沈降分離槽４内において複数の流出孔３′から担体１０を含む被処理水が分散流として、相対する水平方向に低流速で流出する。
【００１８】
そのため、本発明の実施の形態１に係る生物学的水処理装置１によれば、被処理水中において分散した担体１０が舞上げ現象により舞上がるようなことがない。従って、従来例１のようにスクリーンを用いる必要がないから、従来例１よりも生物学的水処理装置の製造コスト、メンテナンスコストの点に関して有利になり、また、汚泥沈殿槽への担体の流出を防止するために担体分離装置を設ける必要がないから、従来例２よりも経済的に有利になるという優れた効果がある。
【００１９】
ところで、本発明の実施の形態１においては、上記のとおり、流入管３に設けられた流出孔３′から相対する方向に担体１０を含む被処理水を分散流として流入させる場合を説明したが、この実施の形態１に係る変形例１の担体沈降分離槽の横断断面図の図３（ａ）に示すように、担体沈降分離槽４の外周に、硝化槽から担体を含む被処理水を送る流入管３が連通する環状の流入水集合管３ａを外嵌し、この流入水集合管３ａの内側に複数本の流入水分散管３ｂを放射状に設けると共に、これら流入水分散管３ｂのそれぞれを担体沈降分離槽４の外周に設けた複数の流入口４ａのそれぞれに連通させて、担体沈降分離槽４内で水平流にする構成にすることができる。
【００２０】
また、変形例２の担体沈降分離槽の横断断面図の図３（ｂ）に示すように、担体沈降分離槽４の外周に、硝化槽から担体を含む被処理水を送る流入管３が連通する角環状の流入水集合管３ａを外嵌し、この流入水集合管３ａの内側に複数本ずつの平行な流入水分散管３ｂを設け、これら流入水分散管３ｂのそれぞれを流入口４ａのそれぞれに連通させて、担体沈降分離槽４内において平行な水平流を生じさせる構成にすることもできる。
【００２１】
本発明の実施の形態２に係る生物学的水処理装置を、そのフロー図の図４を参照しながら、上記実施の形態１と同一のものならびに同一機能を有するものに同一符号を付して説明すると、本実施の形態２は、図４と上記実施の形態１に係るそのフロー図の図１との比較において良く理解されるように、担体戻し管と硝化液循環管とを兼用する構成にしたものであって、担体沈降分離槽４の槽底に沈殿した担体１０を、被処理水である硝化液の一部と共に担体・硝化液戻し管１１を介して脱窒槽２１と硝化槽２２とからなる反応タンク２の前記脱窒槽２１の上流側に戻すように構成したものである。
【００２２】
なお、この担体・硝化液戻し管１１に介装されてなる循環ポンプ１１ａは、上記実施の形態１における担体戻しポンプと同形式のエアリフト形式になるものである。また、担体沈降分離槽４の流入口４ａへの流入管３の連通形式としては、上記実施の形態１と同様の形式であっても良いものである。
【００２３】
従って、本実施の形態２に係る生物学的水処理装置１によれば、担体１０を含む被処理水である硝化液は担体・硝化液戻し管１１を介して脱窒槽２１に戻されるが、この脱窒槽２１に戻された担体１０は、この脱窒槽２１から硝化槽２２に流入するので、本実施の形態２は上記実施の形態１と同効である。
【００２４】
本発明の実施の形態３に係る生物学的水処理装置を、そのフロー図の図５を参照しながら、上記実施の形態１と同一のものならびに同一機能を有するものに同一符号を付して説明すると、本実施の形態３は、図５と上記実施の形態１に係るそのフロー図の図１との比較において良く理解されるように、脱窒槽２１と硝化槽２２とからなる反応タンク２の前記硝化槽２２の一部に担体沈降分離槽部４′を設けて、硝化層と担体沈降分離槽とを一体構成としたものである。
【００２５】
従って、本実施の形態３に係る生物学的水処理装置１は、上記実施の形態１が分離構成であるのに対して一体構成となっているだけだから、本実施の形態３は上記実施の形態１ と同効である。
【００２６】
なお、上記実施の形態１乃至３の場合にあっては、何れも反応タンクが脱窒槽２１と硝化槽２２とからなる場合の例であるが、例えば有機物を分解するための分解槽、脱窒槽、硝化槽が単独に構成されてなるものであっても良い。
【００２７】
【発明の効果】
以上述べたように、本発明の請求項１，２に係る生物学的水処理装置、または本発明の請求項３，４に係る生物学的水処理方法によれば、硝化槽から担体を含む被処理水が担体沈降分離槽内に流入するが、流入口の位置は、この担体沈降分離槽の排水位置よりも低位置であり、そして複数の流入部から担体を含む被処理水が分散流として、相対する水平方向に低流速で流出するため、被処理水中において分散した担体１０が舞上げ現象により舞上がるようなことがない。従って、従来例１のようにスクリーンを用いる必要がないから、従来例１よりも生物学的水処理装置の製造コスト、メンテナンスコストの点に関して有利になり、また、汚泥沈殿槽への担体の流出を防止するために担体分離装置を設ける必要がないから、従来例２よりも経済的に有利になるという優れた効果がある。
【図面の簡単な説明】
【図１】 本発明の実施の形態１に係り、生物学的水処理方法を実現する生物学的水処理装置のフロー図である。
【図２】 本発明の実施の形態１に係り、図２（ａ）は生物学的水処理装置の担体沈降分離槽の断面図で、図２（ｂ）は図２（ａ）のＢ−Ｂ線断面図である。
【図３】 本発明の実施の形態１に係り、図３（ａ）は変形例１の担体沈降分離槽の横断断面図で、図３（ｂ）は変形例２の担体沈降分離槽の横断断面図である。
【図４】 本発明の実施の形態２に係る生物学的水処理装置のフロー図である。
【図５】 本発明の実施の形態３に係る生物学的水処理装置のフロー図である。
【図６】 従来例１に係る水処理方法を実現する水処理装置の工程図である。
【図７】 従来例２に係る水処理装置の構成図である。
【符号の説明】
１…生物学的水処理装置，２…反応タンク，２１…脱窒槽，２１ａ…短絡流防止用壁，２２…硝化槽，２２ａ…阻流壁，３…流入管，３′…流出孔，３ａ…流入水集合管，３ｂ…流入水分散管，４…担体沈降分離槽，４′…担体沈降分離槽部，４ａ…流入口，５…排水部，５ａ…越流堰，５ｂ…トラフ，６…分離水流出管，７…最終沈殿池，８…担体戻し管，８ａ…担体戻しポンプ，９…硝化液循環管，１０…担体，１１…担体・硝化液戻し管，１１ａ…循環ポンプ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a biological water treatment apparatus and a biological water treatment method for purifying wastewater using microorganisms immobilized on a carrier, and more particularly, to prevent the occurrence of a soaring phenomenon of a carrier, and a screen. The present invention belongs to the technical field of biological water treatment apparatus and biological water treatment method which makes it possible to prevent the carrier from flowing out without being used.
[0002]
[Prior art]
As a water treatment apparatus and a water treatment method for purifying wastewater using microorganisms, those utilizing a nitrification denitrification apparatus are known. Among such water treatment apparatuses and water treatment methods, those in which a carrier on which microorganisms are immobilized are settled and separated are disclosed in, for example, Japanese Patent Laid-Open Nos. 5-261393 and 9-75994. What is disclosed is known. Hereinafter, the outline of these nitrification denitrification apparatuses will be sequentially described.
[0003]
First, the outline of a water treatment apparatus for carrying out the water treatment method according to Conventional Example 1 disclosed in Japanese Patent Laid-Open No. 5-261393 will be described with reference to FIG. , A denitrification process 2, a nitrification process 3 using a carrier on which microorganisms are immobilized, and a sludge separation process 7 in order to treat wastewater by a biological nitrification denitrification method. The carrier 4 is settled and separated in the carrier sedimentation step 12 and led to the liquid cyclone 15 as a carrier separation device, and the separated liquid is circulated to the denitrification emperor 2 through the cyclone overflow pipe 16. The carrier 4 recovered by the liquid cyclone 15 is returned to the nitrification step 3 via a cyclone underflow pipe 17.
[0004]
Next, the outline of the water treatment apparatus according to Conventional Example 2 disclosed in Japanese Patent Laid-Open No. 9-75994 will be described with reference to FIG. The suspended activated sludge and the carrier 24 that have flown out with the liquid are lowered by the descending flow path 54 and flow into the separation chamber 56 where the carrier 24 is settled and separated by utilizing the specific gravity difference between the suspended activated sludge and the carrier 24. It is like that. The carrier 24 settled and separated at the bottom of the separation chamber 56 flows through the water supply pipe 58 that takes the lower layer liquid in the separation chamber 56 and feeds it to the nitrification tank 26, and is returned to the nitrification tank 26. At that time, since the flow of the water supply pipe 58 is formed by the air lift, the carrier 24 is not destroyed. On the other hand, the floating activated sludge is configured to be sent to the sludge settling tank 18 through the trough 70 that overflows the water to be treated together with the upper layer liquid of the separation chamber 56.
[0005]
[Problems to be solved by the invention]
Although the water treatment apparatus according to the conventional example 1 or 2 is considered to be useful as such, each of these apparatuses has problems to be solved as described below. First, with regard to Conventional Example 1 having a carrier sedimentation step (hereinafter referred to as a carrier separation device), a cyclone or a screen is added to the subsequent step side of the carrier separation device, so that the manufacturing cost and maintenance of the additional equipment are increased. The problem to be solved arises in terms of economy and maintenance (periodic cleaning for clogging).
[0006]
In the conventional example 2 that does not require a screen or a carrier separation device, it is configured such that a downward flow is generated when the water to be treated containing the carrier flows into the carrier sedimentation separation tank (separation chamber). There is a possibility that the lifting phenomenon occurs and the carrier flows out to the sludge settling tank through the trough together with the suspended activated sludge. In order to prevent the carrier from flowing out to the sludge settling tank, a screen and a carrier separation device are required in the post-process, resulting in a problem to be solved economically resulting in an increase in cost.
[0007]
Accordingly, an object of the present invention is to provide a biological water treatment apparatus and a biological water treatment method that can prevent the occurrence of a carrier rising phenomenon and prevent the carrier from flowing out without using a screen. Is to provide.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the means adopted by the biological water treatment apparatus according to claim 1 of the present invention is a biological method using a carrier on which microorganisms that decompose organic matter and nitrogen components are immobilized. In a biological water treatment apparatus for treating waste water, a reaction tank and a carrier sedimentation separation tank are provided, and the carrier sedimentation separation tank has a plurality of inflows into which treated water containing a carrier drained from the reaction tank is allowed to flow. And a drainage part for draining the separated water from which the carrier has been separated, and the inflow part is located below the drainage part with the treated water as a dispersed flow , and this carrier sedimentation separation It is configured to flow in opposite horizontal directions in the tank .
[0009]
The means adopted by the biological water treatment apparatus according to claim 2 of the present invention is the biological water treatment apparatus according to claim 1, wherein the treated water containing the carrier drained from the reaction tank is The inflowing water collecting pipe provided in the vicinity of the carrier sedimentation separation tank is configured to flow into the carrier sedimentation separation tank from the inflow portion .
[0010]
The biological water treatment method according to claim 3 of the present invention employs a carrier on which microorganisms capable of decomposing organic matter and nitrogen components are immobilized, and sequentially passes wastewater through a reaction tank and a carrier sedimentation separation tank. In the biological water treatment method to be treated, the water to be treated containing the carrier from the reaction tank to the carrier sedimentation separation tank is dispersed in a horizontal direction in the carrier sedimentation separation tank from a plurality of inflow portions. The separated water separated from the carrier in the carrier sedimentation / separation tank is drained from a drainage portion provided at a position higher than the inflow position of the water to be treated containing the carrier in the carrier sedimentation / separation tank. Is.
[0011]
Means for biological water treatment method according to claim 4 is employed in the present invention, the vicinity of the biological water treatment method according to claim 3, the treated water containing the carrier, the carrier settling tank and is characterized in Rukoto flows towards the support the settling tank from the inlet through the inlet water collecting pipe provided on.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the biological water treatment apparatus according to Embodiment 1 for realizing the biological water treatment method of the present invention will be described with reference to FIG. 1 of the flow diagram and FIG. 2 (a) of the schematic sectional view of the carrier sedimentation separation tank. ) And FIG. 2B of the sectional view taken along the line BB in FIG. 2A.
[0013]
Reference numeral 1 shown in FIG. 1 is a biological water treatment apparatus according to Embodiment 1 of the present invention. In this biological water treatment apparatus 1, primary treated water obtained by first treating waste water such as sewage containing organic matter and nitrogen components (ammonia nitrogen component, organic nitrogen component, etc.) flows in and short-circuited inside. A reaction tank 2 comprising a denitrification tank 21 having a prevention partition wall 21a, a nitrification tank 22 provided on the downstream side of the denitrification tank 21 and having a blocking wall 22a inside, and a nitrification tank 22 of the reaction tank 2 Structure to be described later in which treated water including a carrier 10 on which microorganisms that decompose organic substances and nitrogen components are immobilized flows into an inlet 4a provided at a position to be described later, which is an inflow portion, via an inflow pipe 3. And the final sedimentation tank into which the separated water from which the carrier 10 is separated from the carrier sedimentation separation tank 4 flows out through a drainage section 5 to be described later and flows in through a separation water outflow pipe 6. 7.
[0014]
As shown in FIG. 2, the inflow pipe 3 has two parallel inflow pipes 3 and 3 each having one end connected to the nitrification tank 22 and has a rectangular cross section. The tank 4 communicates horizontally with an inflow port 4a provided at a height of about 1/3 from the lower side of one side wall in the vertical direction. In the carrier sedimentation / separation tank 4, a plurality of outflow holes 3 ′ are provided for allowing the liquid to be treated including the carrier 10 to flow out in the opposite horizontal direction as a dispersed flow. Further, the drainage part 5 of the carrier sedimentation separation tank 4 is provided at a position higher than the communication position of the inflow pipe 3, which is an overflow weir 5a and a separation that has flowed over the overflow weir 5a. It consists of a trough 5b in which water flows like a bowl. In FIG. 2 (a), the arrow indicating the direction of the dispersed flow flowing out from the outflow hole 3 'is downward, but as is well understood from FIG. 2 (b), this is a displacement illustration. Thus, the actual direction of the arrow is the direction perpendicular to the drawing. Further, the position of the inlet 4a with which the inflow pipe 3 of the carrier sedimentation tank 4 communicates is determined based on the results of various inflow tests.
[0015]
Then, separated water flows from the trough 5b into the final sedimentation basin 7 through the separated water outflow pipe 6, and a part of the separated water reacts through the nitrification liquid circulation pipe 9 branched from the separated water outflow pipe 6. It is returned to the upstream side of the denitrification tank 21 of the tank 2. Subsequently, the carrier 10 precipitated on the bottom of the carrier sedimentation separation tank 4 is returned to the upstream side of the nitrification tank 22 of the reaction tank 2 through the carrier return pipe 8 together with a part of the nitrification liquid as the water to be treated. It is configured as follows.
[0016]
The carrier return pump 8a for returning the carrier 10 together with a part of the nitrification liquid to the upstream side of the denitrification tank 21 via the carrier return pipe 8 sends air to the nitrification liquid containing the carrier 10 as shown in FIG. It is a so-called air lift type that is raised with a small specific gravity. The use of such an air lift type carrier return pump 8a is intended to prevent the carrier 10 from being damaged.
[0017]
Hereinafter, the operation mode of the biological water treatment apparatus 1 according to Embodiment 1 of the present invention will be described. To-be-treated water including the carrier 10 is discharged from the nitrification tank through the inflow pipe 3 and the inflow port 4a. Although it flows into the carrier sedimentation separation tank 4 from the hole 3 ′, the position of the inlet 4 a is lower than the drainage part 5, that is, at a height of about 1/3 in the vertical direction of the carrier sedimentation separation tank 4. In addition, in the carrier sedimentation / separation tank 4, the water to be treated including the carrier 10 flows out from the plurality of outflow holes 3 'as a dispersed flow at a low flow rate in the opposite horizontal direction.
[0018]
Therefore, according to the biological water treatment apparatus 1 according to Embodiment 1 of the present invention, the carrier 10 dispersed in the for-treatment water does not rise due to the soaring phenomenon. Therefore, since it is not necessary to use a screen as in the conventional example 1, it is more advantageous than the conventional example 1 in terms of manufacturing cost and maintenance cost of the biological water treatment apparatus, and the outflow of the carrier to the sludge settling tank. In order to prevent this, it is not necessary to provide a carrier separation device, so that there is an excellent effect that it is more economically advantageous than the conventional example 2.
[0019]
By the way, in the first embodiment of the present invention, as described above, the case where the water to be treated including the carrier 10 is introduced as a dispersed flow in the opposite direction from the outflow hole 3 ′ provided in the inflow pipe 3 has been described. As shown in FIG. 3 (a) of the cross-sectional view of the carrier sedimentation separation tank of Modification 1 according to the first embodiment, the water to be treated containing the carrier from the nitrification tank is placed on the outer periphery of the carrier sedimentation separation tank 4. An annular inflow water collecting pipe 3a that communicates with the inflow pipe 3 to be sent is externally fitted, and a plurality of inflowing water dispersion pipes 3b are provided radially inside the inflowing water collecting pipe 3a. Can be communicated with each of the plurality of inlets 4 a provided on the outer periphery of the carrier sedimentation separation tank 4 to form a horizontal flow in the carrier sedimentation separation tank 4.
[0020]
Further, as shown in FIG. 3 (b), which is a cross-sectional view of the carrier sedimentation / separation tank of Modification 2, an inflow pipe 3 is connected to the outer periphery of the carrier sedimentation / separation tank 4 to feed the water to be treated including the carrier from the nitrification tank And a plurality of parallel inflow water dispersion pipes 3b are provided inside the inflow water collection pipe 3a, and each of the inflow water dispersion pipes 3b is connected to the inlet 4a. It is also possible to adopt a configuration in which a parallel horizontal flow is generated in the carrier sedimentation separation tank 4 by communicating with each other.
[0021]
The biological water treatment apparatus according to the second embodiment of the present invention is given the same reference numerals to those having the same functions and the same functions as those in the first embodiment while referring to FIG. 4 of the flowchart. To explain, in the second embodiment, as well understood in the comparison between FIG. 4 and FIG. 1 of the flow chart according to the first embodiment, the carrier return pipe and the nitrating liquid circulation pipe are combined. The carrier 10 precipitated at the bottom of the carrier sedimentation separation tank 4 and a part of the nitrification liquid as the water to be treated together with the denitrification tank 21 and the nitrification tank 22 via the carrier / nitrification liquid return pipe 11. It is comprised so that it may return to the upstream of the said denitrification tank 21 of the reaction tank 2 consisting of these.
[0022]
The circulating pump 11a interposed in the carrier / nitrification liquid return pipe 11 is of the same type as the carrier return pump in the first embodiment. Further, the communication form of the inflow pipe 3 to the inlet 4a of the carrier sedimentation separation tank 4 may be the same form as in the first embodiment.
[0023]
Therefore, according to the biological water treatment apparatus 1 according to the second embodiment, the nitrification liquid that is the water to be treated including the carrier 10 is returned to the denitrification tank 21 via the carrier / nitrification liquid return pipe 11. Since the carrier 10 returned to the denitrification tank 21 flows from the denitrification tank 21 into the nitrification tank 22, the second embodiment has the same effect as the first embodiment.
[0024]
The biological water treatment apparatus according to the third embodiment of the present invention is denoted by the same reference numerals as those in the first embodiment and those having the same functions while referring to FIG. If it demonstrates, this Embodiment 3 is the reaction tank 2 which consists of the denitrification tank 21 and the nitrification tank 22, so that it may understand well in the comparison with FIG. 1 of the flowchart which concerns on FIG. A part of the nitrification tank 22 is provided with a carrier sedimentation / separation tank part 4 'so that the nitrification layer and the carrier sedimentation / separation tank are integrated.
[0025]
Therefore, the biological water treatment apparatus 1 according to the third embodiment is only integrated with the first embodiment, whereas the first embodiment is a separate configuration. It is the same effect as Form 1 .
[0026]
In the case of Embodiments 1 to 3, the reaction tank is an example in which the reaction tank includes the denitrification tank 21 and the nitrification tank 22, but for example, a decomposition tank or a denitrification tank for decomposing organic substances. The nitrification tank may be constituted independently.
[0027]
【The invention's effect】
As described above, according to the biological water treatment apparatus according to claims 1 and 2 of the present invention or the biological water treatment method according to claims 3 and 4 of the present invention, the carrier is contained from the nitrification tank. The water to be treated flows into the carrier sedimentation separation tank, but the position of the inlet is lower than the drainage position of the carrier sedimentation separation tank, and the water to be treated including the carrier is dispersed from a plurality of inflow portions. As a result, the carrier 10 dispersed in the water to be treated does not soar due to the soaring phenomenon because it flows out in the opposite horizontal direction at a low flow rate. Therefore, since it is not necessary to use a screen as in the conventional example 1, it is more advantageous than the conventional example 1 in terms of manufacturing cost and maintenance cost of the biological water treatment apparatus, and the outflow of the carrier to the sludge settling tank. In order to prevent this, it is not necessary to provide a carrier separation device, so that there is an excellent effect that it is more economically advantageous than the conventional example 2.
[Brief description of the drawings]
FIG. 1 is a flowchart of a biological water treatment apparatus that realizes a biological water treatment method according to Embodiment 1 of the present invention.
FIG. 2 relates to the first embodiment of the present invention, FIG. 2 (a) is a cross-sectional view of a carrier sedimentation tank of a biological water treatment device , and FIG. 2 (b) is a cross-sectional view of FIG. It is B line sectional drawing.
3A is a cross- sectional view of a carrier sedimentation separation tank according to a first modification , and FIG. 3B is a cross- sectional view of the carrier sedimentation separation tank according to a second modification , according to the first embodiment of the present invention. It is sectional drawing.
4 is a flow diagram of the engaging Ru biological water treatment device according to the second embodiment of the present invention.
5 is a flow diagram of the engaging Ru biological water treatment device to the third embodiment of the present invention.
FIG. 6 is a process diagram of a water treatment apparatus for realizing a water treatment method according to Conventional Example 1 .
7 is a configuration diagram of a water treatment device according to Conventional Example 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Biological water treatment apparatus, 2 ... Reaction tank, 21 ... Denitrification tank, 21a ... Wall for short circuit flow prevention, 22 ... Nitrification tank, 22a ... Barrier wall, 3 ... Inflow pipe, 3 '... Outflow hole, 3a Inflow water collecting pipe, 3b ... Inflow water dispersion pipe, 4 ... Carrier sedimentation separation tank, 4 '... Carrier sedimentation separation tank section, 4a ... Inlet, 5 ... Drainage section, 5a ... Overflow weir, 5b ... Trough, 6 DESCRIPTION OF SYMBOLS ... Separation water outflow pipe, 7 ... Final sedimentation basin, 8 ... Carrier return pipe, 8a ... Carrier return pump, 9 ... Nitrification liquid circulation pipe, 10 ... Carrier, 11 ... Carrier / nitrification liquid return pipe, 11a ... Circulation pump.

Claims (4)

有機物や窒素成分を分解する微生物が固定化された担体を用いた生物学的方法により廃水を処理する生物学的水処理装置において、反応タンクと、担体沈降分離槽とを備え、前記担体沈降分離槽は、前記反応タンクから排水された担体を含む被処理水を流入させる複数の流入部と、担体を分離させた分離水を排水する排水部とを備えると共に、前記流入部が前記被処理水を分散流として、前記排水部よりも下側位置であって、かつこの担体沈降分離槽内の相対する水平方向に流入させるように構成されてなることを特徴とする生物学的水処理装置。A biological water treatment apparatus for treating wastewater by a biological method using a carrier on which microorganisms that decompose organic matter and nitrogen components are immobilized. The biological water treatment apparatus includes a reaction tank and a carrier sedimentation separation tank, and the carrier sedimentation separation is performed. The tank includes a plurality of inflow portions into which treated water including the carrier drained from the reaction tank is allowed to flow in, and a drainage portion that drains the separated water from which the carrier has been separated, and the inflow portion serves as the treated water. The biological water treatment apparatus is configured to flow in a horizontal direction opposite to the drainage section and in the opposite horizontal direction in the carrier sedimentation separation tank . 前記反応タンクから排水された担体を含む被処理水が、前記担体沈降分離槽の近傍に設けられた流入水集合管を介して前記流入部から前記担体沈降分離槽へ流入するように構成されてなることを特徴とする請求項１に記載の生物学的水処理装置。The treated water containing the carrier drained from the reaction tank is configured to flow into the carrier sedimentation separation tank from the inflow portion via an inflow water collecting pipe provided in the vicinity of the carrier sedimentation separation tank. The biological water treatment apparatus according to claim 1, wherein 有機物や窒素成分を分解する微生物が固定化された担体を用い、廃水を反応タンクおよび担体沈降分離槽を順次経由させて処理する生物学的水処理方法において、前記反応タンクから前記担体沈降分離槽に前記担体を含む被処理水を、複数の流入部から分散流として前記担体沈降分離槽内の相対する水平方向に流入させ、前記担体沈降分離槽で担体と分離された分離水をこの担体沈降分離槽内の担体を含む被処理水の流入位置よりも上位位置に設けた排水部から排水させることを特徴とする生物学的水処理方法。 In the biological water treatment method in which waste water is treated through a reaction tank and a carrier sedimentation separation tank in order using a carrier on which microorganisms that decompose organic substances and nitrogen components are immobilized, the carrier sedimentation separation tank is separated from the reaction tank. The treated water containing the carrier is introduced into the carrier sedimentation separation tank in a horizontal direction as a dispersed flow from a plurality of inflow portions, and the separated water separated from the carrier in the carrier sedimentation separation tank is separated into the carrier sedimentation. biological biological water treatment how to characterized thereby drained from the drain portion provided in the upper position than the inflow position of the for-treatment water containing the carrier in the separation tank. 前記担体を含む被処理水を、前記担体沈降分離槽の近傍に設けた流入水集合管を介して前記流入部から担体沈降分離槽へ流入させることを特徴とする請求項３に記載の生物学的水処理方法。 The treated water containing the carrier organism according to claim 3, characterized in Rukoto flows towards the support the settling tank from the inlet through the inlet water collecting pipe provided near the carrier settling tank Water treatment method .
JP10652799A 1999-04-14 1999-04-14 Biological water treatment apparatus and biological water treatment method Expired - Fee Related JP3721004B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10652799A JP3721004B2 (en) 1999-04-14 1999-04-14 Biological water treatment apparatus and biological water treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10652799A JP3721004B2 (en) 1999-04-14 1999-04-14 Biological water treatment apparatus and biological water treatment method

Publications (2)

Publication Number Publication Date
JP2000296396A JP2000296396A (en) 2000-10-24
JP3721004B2 true JP3721004B2 (en) 2005-11-30

Family

ID=14435877

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10652799A Expired - Fee Related JP3721004B2 (en) 1999-04-14 1999-04-14 Biological water treatment apparatus and biological water treatment method

Country Status (1)

Country Link
JP (1) JP3721004B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112441682A (en) * 2020-11-09 2021-03-05 郭忠文 Pressure-bearing sewage treatment method, mixing device and pressure-bearing sewage purification equipment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6021310U (en) * 1983-07-22 1985-02-14 日兼特殊工業株式会社 Solid-liquid separation tank using rotating shear flow
JPH0698247B2 (en) * 1985-07-29 1994-12-07 オルガノ株式会社 Float blanket type coagulating sedimentation equipment
JPH1128490A (en) * 1997-07-11 1999-02-02 Nkk Corp Fluidized bed type sewage treatment device

Also Published As

Publication number Publication date
JP2000296396A (en) 2000-10-24

Similar Documents

Publication Publication Date Title
JP2020049432A (en) Operating method of organic wastewater treatment device and organic wastewater treatment device
KR101541070B1 (en) method and device for controlling using turbulence stimulation and filter member
KR100971880B1 (en) Horizontal sedimentation system
JP3721004B2 (en) Biological water treatment apparatus and biological water treatment method
KR102581817B1 (en) Advanced wastewater treatment apparatus comprising floating filter tank capable of monitoring
WO2015076562A2 (en) Biofilm water treatment device having non-powered backwashing function
JP3150530B2 (en) Biological nitrogen removal equipment
JP5380209B2 (en) Waste water treatment equipment
KR101433687B1 (en) Double bio-film water treatment apparatus
KR100469317B1 (en) System for Advanced Wastewater Treatment using ozone
JPS6351994A (en) System for treating drainage
JPH10165980A (en) Anaerobic treatment apparatus for organic waste water
JP2007260515A (en) Sludge separator and sludge separation method
JP2585187B2 (en) Organic wastewater biological treatment method
JP3970612B2 (en) Purification processing apparatus and purification processing method
KR100237606B1 (en) Biological treatment device of wastewater with perpendicular and single unit for denitrification, reaction and sedimentation
JP2001047085A5 (en)
JPH0975994A (en) Biological waste water treating device
KR102581775B1 (en) Advanced wastewater treatment apparatus comprising floating filter tank
JPH10216787A (en) Waste water treatment equipment
JP3794589B1 (en) Sewage treatment equipment
JPH08290185A (en) Sewage purifying tank
JPH10249391A (en) Waste water treating device
KR200305457Y1 (en) System for Advanced Wastewater Treatment using ozone
JPH1043794A (en) Nitrogen removing device

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20031212

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20040513

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040716

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040803

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20040929

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20050830

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20050909

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080916

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090916

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090916

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090916

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100916

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100916

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110916

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110916

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120916

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120916

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120916

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120916

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130916

Year of fee payment: 8

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees