JP3131658B2 - Wastewater biological treatment method - Google Patents
Wastewater biological treatment methodInfo
- Publication number
- JP3131658B2 JP3131658B2 JP04123341A JP12334192A JP3131658B2 JP 3131658 B2 JP3131658 B2 JP 3131658B2 JP 04123341 A JP04123341 A JP 04123341A JP 12334192 A JP12334192 A JP 12334192A JP 3131658 B2 JP3131658 B2 JP 3131658B2
- Authority
- JP
- Japan
- Prior art keywords
- wastewater
- microorganisms
- biological treatment
- treated
- microbial
- 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
Links
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
- Biological Treatment Of Waste Water (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、排水の生物処理方法に
関し、より詳しくは、上向流通過方式の生物処理方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological treatment method for wastewater, and more particularly, to an upward flow type biological treatment method.
【０００２】[0002]
【従来技術および解決すべき課題】微生物を用いる排水
の生物処理において、微生物を自己造粒させて高密度な
微生物塊を形成させる技術がある。この技術によると、
微生物を固定化する担体を用いる必要がないので、生物
処理槽の容積効率が高くなり、また、微生物塊は沈降性
が高いので、上向流で処理槽外に排出されないという特
徴を有する。しかし、都市下水等の比較的低濃度な排水
においては、微生物を自己造粒させて微生物塊を形成さ
せることは一般に困難である。このような低濃度排水に
おいても、処理すべき排水を生物処理装置の下部から供
給して穏やかに上昇させ、装置上部から処理水を排出さ
せる1-pass方式により、グラニュール状の微生物塊を形
成した例がある。しかしながらこの1-pass方式では、偏
流等の要因により、処理すべき排水と微生物の接触効率
が悪くなり、また排水濃度の急激な変化等の負荷変動に
対して微生物が敏速に馴じまず、処理能力の低下や微生
物の死滅等が起こるという問題があった。2. Description of the Related Art In biological treatment of wastewater using microorganisms, there is a technique of forming a high-density microbial mass by self-granulating the microorganisms. According to this technology,
Since there is no need to use a carrier for immobilizing microorganisms, the volumetric efficiency of the biological treatment tank is increased, and the microorganisms have a high sedimentation property and are not discharged out of the treatment tank in an upward flow. However, in relatively low-concentration drainage such as municipal sewage, it is generally difficult to form microorganisms by self-granulating microorganisms. Even in such low-concentration wastewater, granules-like microbial clumps are formed by the 1-pass method, in which wastewater to be treated is supplied from the bottom of the biological treatment equipment and rises gently, and the treated water is discharged from the upper part of the equipment. There is an example. However, in the 1-pass method, the contact efficiency between the wastewater to be treated and the microorganisms is deteriorated due to factors such as drift, and the microorganisms do not readily adapt to load fluctuations such as a rapid change in the concentration of the wastewater. There has been a problem that the ability is reduced and microorganisms are killed.
【０００３】一方、処理すべき排水と微生物の接触効率
を高めるため、処理槽内の排水を攪拌または循環させる
方式がある。この循環方式では、処理水を循環させて処
理すべき排水と完全混合するので、槽内の排水がより処
理水に近い状態となるので、負荷変動に対応することが
できる。しかしながら循環方式で比較的低濃度の排水を
処理する場合は、槽内の排水がより低濃度となるので、
微生物の自己造粒が更に困難になるという問題があっ
た。On the other hand, there is a method of stirring or circulating wastewater in a treatment tank in order to increase the contact efficiency between wastewater to be treated and microorganisms. In this circulation system, the treated water is circulated and completely mixed with the wastewater to be treated, so that the wastewater in the tank is closer to the treated water, and thus it is possible to cope with load fluctuations. However, when treating relatively low-concentration wastewater by the circulation method, the wastewater in the tank will have a lower concentration.
There is a problem that self-granulation of microorganisms becomes more difficult.
【０００４】本発明は、上記の実状に鑑みて、グラニュ
ール状微生物塊の形成がより容易になり、かつ、安定的
な処理が可能になる、ステップ循環式嫌気性生物処理方
法を提供することを目的とする。The present invention has been made in view of the above circumstances, and provides a step-circulating anaerobic organism treatment method that facilitates the formation of granule-like microbial masses and enables stable treatment. With the goal.
【０００５】本発明者らは、鋭意研究した結果、上記1-
pass方式の長所および上記循環方式の長所をうまく取り
入れることにより、上記目的を達成できることを見出だ
し、本発明を完成するに至った。The present inventors have conducted intensive studies and as a result, have found that
The inventor has found that the above object can be achieved by properly incorporating the advantages of the pass method and the advantages of the circulation method, and have completed the present invention.
【０００６】[0006]
【課題を解決するための手段】すなわち、本発明は、処
理すべき排水を生物処理装置下部から供給し、処理水を
同装置上部から排出する、排水の生物処理方法におい
て、同装置の下半部では、高密度の微生物塊を保持し、
供給された排水を緩やかな流速で上昇させ、同装置の上
半部では、同装置上部から処理水の一部を取り出して同
装置の高さ中央部に循環させることを特徴とする、排水
の生物処理方法である。That is, the present invention relates to a biological treatment method for wastewater, wherein wastewater to be treated is supplied from the lower part of the biological treatment apparatus and treated water is discharged from the upper part of the biological treatment apparatus. The part holds a high density of microbial clumps,
The supplied wastewater is raised at a gentle flow rate, and in the upper part of the device, part of the treated water is taken out from the upper part of the device and circulated to the center of the height of the device. It is a biological treatment method.
【０００７】本発明においては、生物処理装置下半部に
高密度の微生物塊が保持されており、下半部で排水の大
半が処理され、上半部でさらに高度な処理が行われる。In the present invention, a high-density microbial mass is held in the lower half of the biological treatment apparatus, most of the wastewater is treated in the lower half, and more advanced treatment is performed in the upper half.
【０００８】[0008]
【作用】本発明では、生物処理装置の下半部では、供給
された排水を緩やかな流速で上昇させるので、比較的低
濃度の排水の場合でもグラニュール状微生物塊等の高密
度微生物塊の形成が容易である。また、同装置の上半部
では、同装置上部から処理水の一部を取り出して同装置
の高さ中央部に循環させるので、排水と微生物の接触効
率が高まり、より高度な処理が可能となる。さらに、循
環水の有する剪断力により、微生物自身の排出するガス
を伴なって同装置下半部から浮上してくる微生物フロッ
クを気固分離させて、微生物塊を沈降させ、排出処理水
中への微生物塊の流出が防止される。According to the present invention, in the lower half of the biological treatment apparatus, the supplied wastewater is raised at a gentle flow rate, so that even in the case of wastewater having a relatively low concentration, high-density microorganisms such as granular-like microorganisms can be removed. Easy to form. Also, in the upper half of the device, part of the treated water is taken out from the upper part of the device and circulated to the center of the device height, so that the efficiency of contact between the wastewater and microorganisms is increased, and more advanced treatment is possible. Become. Furthermore, due to the shearing force of the circulating water, the microbial flocs floating from the lower half of the device with the gas discharged by the microorganisms themselves are separated by gas-solid separation, and the microbial clumps are settled and discharged into the treated water. The outflow of microbial mass is prevented.
【０００９】[0009]
【実施例】次に実施例によって、本発明の方法をさらに
具体的に説明する。Next, the method of the present invention will be described in more detail with reference to examples.
【００１０】図１に示すように、比較的低濃度の処理す
べき排水（供給水）を導管(6) によって生物処理装置
(1) の下部から供給する。装置の下半部(2) は高密度微
生物ゾーンとなっており、供給水を緩やかな流速で上昇
通過させる。続いて装置の上半部(3) では、循環ポンプ
(4) を用いて装置上部から処理水の一部を導管(7) によ
って取り出して、ノズル(5) を介して装置の高さ中央部
に導入循環させる。すなわち、上半部(3) はステップ循
環ゾーンとなっている。最終的な処理水を装置上部から
導管(8) によって排出する。As shown in FIG. 1, wastewater to be treated (supply water) having a relatively low concentration is supplied to a biological treatment apparatus by a conduit (6).
Supply from the bottom of (1). The lower half (2) of the device is a high-density microbial zone, which allows feed water to rise upward at a slow flow rate. Next, in the upper half of the device (3),
Using (4), a part of the treated water is taken out from the upper part of the apparatus by the conduit (7), and introduced and circulated to the center of the height of the apparatus through the nozzle (5). That is, the upper half (3) is a step circulation zone. The final treated water is drained from the top of the device by conduit (8).
【００１１】このような方法において、装置下半部(2)
の高密度微生物ゾーンでは、供給水に含まれる有機物質
などの栄養源を吸収して微生物が増殖すると同時に、供
給水中の有機物質などの大部分が処理される。下半部
(2) では、供給水は上向きの比較的穏やかな流れである
ので、グラニュール状微生物塊などが容易に形成され
る。グラニュール状微生物塊は、沈降性に優れており、
高密度な状態で装置下半部(2) に保持され、装置の容積
効率を高めることができる。In such a method, the lower half of the apparatus (2)
The high-density microbial zone absorbs nutrients such as organic substances contained in the feed water to grow microorganisms and at the same time treats most of the organic substances and the like in the feed water. Lower half
In (2), the supply water is a relatively gentle upward flow, so that granule-like microbial clumps and the like are easily formed. Granular microbial mass is excellent in sedimentation,
It is held in the lower half (2) of the device in a high density state, and the volumetric efficiency of the device can be increased.
【００１２】微生物は有機物質などを消化する際に二酸
化炭素などのガスを発生させるが、このガスが微生物塊
に含まれると、微生物塊の比重が軽くなる。そのため、
微生物塊が装置下半部(2) 内を浮上するようになる。本
方法では、装置の高さ中央部にノズル(5) から導入され
る処理水流の剪断力により微生物フロックの気固分離が
行なわれ、微生物塊は沈降して装置下半部(2) に保持さ
れやすい。Microorganisms generate gas such as carbon dioxide when digesting organic substances. When this gas is included in the microbial mass, the specific gravity of the microbial mass is reduced. for that reason,
The microbial mass comes to float in the lower half (2) of the device. In this method, gas-solid separation of microbial flocs is carried out by the shearing force of the treated water flow introduced from the nozzle (5) at the center of the height of the device, and the microbial mass sediments and is retained in the lower half of the device (2) Easy to be.
【００１３】また、装置上半部(3) のステップ循環ゾー
ンでは、高密度微生物ゾーンと比較して、微生物の保持
量が少ないのであるが、処理水の一部を循環させること
により、処理すべき排水と微生物の接触効率が高められ
る。In the step circulation zone in the upper half (3) of the apparatus, the amount of microorganisms retained is smaller than that in the high-density microorganisms zone. Efficiency of contact between wastewater and microorganisms should be increased.
【００１４】[0014]
【発明の効果】本発明の処理方法によれば、上述したよ
うに、比較的低濃度の排水を処理する場合においても、
装置下半部(2) での微生物の自己造粒が促進され、微生
物が高密度に保たれ、装置の容積効率が高くなる。ま
た、装置上半部(3) では、微生物の濃度は低いものの、
循環により排水と微生物の接触効率が高められるので高
度な処理が可能となる。さらに、装置上半部(3) の微生
物濃度が低いので、排出処理水中に流出する微生物を最
小限にできるため、標準活性汚泥法等において行なわれ
ている汚泥返送プロセス等が不要となる。According to the treatment method of the present invention, as described above, even when relatively low concentration wastewater is treated,
The self-granulation of the microorganisms in the lower half (2) of the device is promoted, the microorganisms are kept at a high density, and the volumetric efficiency of the device is increased. In the upper half of the device (3), although the concentration of microorganisms is low,
The circulation increases the efficiency of contact between the wastewater and the microorganisms, thereby enabling advanced treatment. Furthermore, since the concentration of microorganisms in the upper half (3) of the apparatus is low, the number of microorganisms flowing out of the treated wastewater can be minimized, so that the sludge return process or the like performed in the standard activated sludge method or the like becomes unnecessary.
【図１】本発明の処理方法を示すフローシートである。FIG. 1 is a flow sheet showing a processing method of the present invention.
(1) …生物処理装置 (2) …装置下半部（高密度微生物ゾーン） (3) …装置上半部（ステップ循環ゾーン） (4) …循環ポンプ (5) …ノズル (6)(7)(8) …導管 (1)… biological treatment equipment (2)… lower part of equipment (high-density microorganism zone) (3)… upper part of equipment (step circulation zone) (4)… circulation pump (5)… nozzle (6) (7) ) (8)… conduit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 沼 隆志 東京都江東区豊洲４丁目９番11号 日新 製糖株式会社 研究部内 (56)参考文献 特開 昭61−90790（ＪＰ，Ａ) 特開 昭63−162098（ＪＰ，Ａ) 実開 昭62−35698（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/06 C02F 3/08 C02F 3/10 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Numa 4-9-1-11 Toyosu, Koto-ku, Tokyo Nisshin Sugar Manufacturing Co., Ltd. (56) References JP-A-61-90790 (JP, A) 63-162098 (JP, A) Fully open Showa 62-35698 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) C02F 3/06 C02F 3/08 C02F 3/10
Claims (1)
供給し、処理水を同装置上部から排出する、排水の生物
処理方法において、同装置の下半部では、高密度の微生
物塊を保持し、供給された排水を緩やかな流速で上昇さ
せ、同装置の上半部では、同装置上部から処理水の一部
を取り出して同装置の高さ中央部に循環させることを特
徴とする、排水の生物処理方法。1. A wastewater treatment method in which wastewater to be treated is supplied from a lower part of a biological treatment apparatus and treated water is discharged from an upper part of the biological treatment apparatus. Then, the supplied wastewater is raised at a gentle flow rate, and in the upper half of the apparatus, a part of the treated water is taken out from the upper part of the apparatus and circulated to the center of the height of the apparatus. Biological treatment of wastewater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04123341A JP3131658B2 (en) | 1992-05-15 | 1992-05-15 | Wastewater biological treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04123341A JP3131658B2 (en) | 1992-05-15 | 1992-05-15 | Wastewater biological treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06154779A JPH06154779A (en) | 1994-06-03 |
| JP3131658B2 true JP3131658B2 (en) | 2001-02-05 |
Family
ID=14858173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04123341A Expired - Fee Related JP3131658B2 (en) | 1992-05-15 | 1992-05-15 | Wastewater biological treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3131658B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9361853B2 (en) | 2009-05-02 | 2016-06-07 | Semiconductor Energy Laboratory Co., Ltd. | Electronic book |
-
1992
- 1992-05-15 JP JP04123341A patent/JP3131658B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9361853B2 (en) | 2009-05-02 | 2016-06-07 | Semiconductor Energy Laboratory Co., Ltd. | Electronic book |
| US11513562B2 (en) | 2009-05-02 | 2022-11-29 | Semiconductor Energy Laboratory Co., Ltd. | Electronic book |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06154779A (en) | 1994-06-03 |
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