JPS6227877B2 - - Google Patents
Info
- Publication number
- JPS6227877B2 JPS6227877B2 JP53001850A JP185078A JPS6227877B2 JP S6227877 B2 JPS6227877 B2 JP S6227877B2 JP 53001850 A JP53001850 A JP 53001850A JP 185078 A JP185078 A JP 185078A JP S6227877 B2 JPS6227877 B2 JP S6227877B2
- Authority
- JP
- Japan
- Prior art keywords
- activated sludge
- tank
- aeration tank
- settling tank
- sludge
- 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
Links
- 239000010802 sludge Substances 0.000 claims description 68
- 238000005273 aeration Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 14
- 239000002351 wastewater Substances 0.000 claims description 11
- 238000004062 sedimentation Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 30
- 238000003756 stirring Methods 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000007787 solid Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 241000223782 Ciliophora Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 241000902900 cellular organisms Species 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- -1 organisms Substances 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Biological Treatment Of Waste Water (AREA)
- Activated Sludge Processes (AREA)
Description
本発明は有機廃水の処理方法に関する。さらに
詳しくは本発明は有機物質を含有する廃水の活性
汚泥生物による処理方法に関する。
廃水中の汚濁物質の表示方法としては一般に
BOD（生物学的酸素要求量）、COD（化学的酸素
要求量）およびSS（懸濁物質量）があげられ
る。BODは水中の好気性微生物の増殖あるいは
呼吸作用によつて消費される溶存酸素量であり、
CODは一般には100℃における過マンガン酸カリ
ウムによる酸素消費量であり、そしてSSは水中
に分散浮遊している固形物たとえば有機物、生物
体および粘土粒子などである。これらのBODお
よびCODを低下せしめ且つSSを除去するために
一般に活性汚泥処理が知られている。この活性汚
泥処理方法においては、曝気槽および沈降槽を用
いている。この曝気槽内の撹拌は、表面機械撹拌
または水中に酸素や空気を吹き込むことによる水
中通気撹拌により行なわれている。
これらの撹拌は、曝気槽内での活性汚泥の生育
に必要な酸素を供給すると同時に槽内における水
の強制撹拌により原水と活性汚泥との接触を充分
ならしめるために行なわれている。しかしながら
従来の方法では原水量および水質変動差が大きい
場合には不安定な条件下で活性汚泥処理を行なわ
なければならなかつた。すなわち運転中における
生物相の変化が圧密性の少ないブロツクを生じそ
のため活性汚泥の沈降が悪くなる状態（いわゆる
バルキング）が多々ある。この原因は正常な活性
汚泥の生物に代つて糸状菌が繁殖するためであ
る。このようなバルキングは活性汚泥処理方法の
管理における最大の難点である。
本発明者はこのようなバルキングを防止する活
性汚泥処理方法について研究を重ねた結果、本発
明を完成するに至つた。
すなわち本発明は、有機物質を含有する廃水を
活性汚泥で処理するにあたり、曝気槽内に固定ま
たは懸垂せしめられた部材に活性汚泥を付着せし
め且つ沈降槽からの引抜き汚泥を曝気槽および沈
降槽の入口に返送し、且つ沈降槽内に前記の活性
汚泥付着部材を設けることを特徴とする活性汚泥
処理方法である。
本発明の一実施例を図面について説明する。１
は曝気槽、２は沈降槽、３は汚泥返送ポンプ、４
は活性汚泥付着部材のフロート部分、５は活性汚
泥付着部材の垂下テール部分、６は有機廃水導入
管、７は曝気槽より沈降槽への導入水管、８は曝
気槽への返送汚泥管、９は沈降槽に導入される返
送汚泥管、１０は処理水管および１１は曝気槽の
撹拌装置、１２は活性汚泥付着部材に付着した活
性汚泥である。有機廃水は導入管６を通り曝気槽
１に導入される。曝気槽内には活性汚泥付着部材
４および５が懸垂されており、さらに撹拌装置１
１が設けられている。この撹拌装置１１を作動さ
せると共に活性汚泥を添加すると活性汚泥は付着
部材に付着する。曝気槽１で処理された原水は沈
降槽２に導入される。沈降槽２には前記と同様な
活性汚泥付着部材が設けられている。この沈降槽
から活性汚泥の一部が汚泥返送ポンプ３により返
送される。この返送汚泥の一部は曝気槽への返送
汚泥管８を経て曝気槽に返送され、残りの一部は
沈降槽に導入される返送汚泥管９を経て沈降槽に
返送される。
本発明において、活性汚泥付着部材とはその表
面に活性汚泥を付着させるためのものであつて、
板状、縄状、シート状、網状、紐状あるいは穴あ
きシート状などの物体が挙げられ、これらの部材
は曝気槽の内部すなわち水中に間隙を設けて固定
または懸垂せしめられる。この付着部材は槽内の
底部または側部に固定してもよく、また槽内水中
に浮かせるなどして懸垂してもよい。この付着部
材として、フロート本体の下方にシート様の垂下
テールを垂下テール間に間隙を設けて連設してな
るものが好ましい。
本発明において活性汚泥の付着部材を間隙を設
けて固定または懸垂せしめることにより、原水中
に含有されるSS（懸濁物質）は部材の前面にて
沈降せしめられ、且つ部材間を原水が通過するこ
とにより部材の裏面においてもSSの沈降が促進
される。
付着部材の材料としては、鉄などの金属、合成
樹脂繊維または木材などがあげられる。
本発明に用いる活性汚泥としては、原生動物中
の繊毛虫類のうちの縁毛目系が好ましい。この縁
毛目系は槽内の活性汚泥付着部材に付着しやすい
条件をもつており、安定付着しうるからである。
本発明においては、曝気槽の内部（水中）に固
定または懸垂させた活性汚泥の付着部材を装備す
ることにより、表面曝気、水中曝気のいずれの方
法においても、付着せしめられた活性汚泥は生物
群として安定に存在するため増殖効果が大きくな
り且つ原水との接触時間が大きくなるため原水の
急激な流量変化および水質変動に対して充分に対
応しうる。さらに曝気槽および沈降槽内にも活性
汚泥の付着部材を装備しているため、曝気槽およ
び沈降槽のいずれにおいてもデツドスペースを生
じにくい。このようにデツドスペースを生じない
ため、汚泥の腐敗または嫌気発酵が起こりにく
く、したがつてバルキングを防止しうる。
本発明において沈降槽内の活性汚泥の一部を、
曝気槽から沈降槽への導入水中に混合して沈降槽
の初期導入部（フイードウエル部）にも一部導入
するため、沈降槽フイードウエル内の活性汚泥の
濃度を高めることができる。この返送汚泥中に酸
素含有気体を吹込むことができる。
本発明において、沈降槽に返送する活性汚泥量
は、処理水の性質により広く変化しうるが、全返
送汚泥量の約５〜30重量％が好ましい。
本発明においては、沈降槽内にも活性汚泥の付
着部材たとえばフロート本体の下方にシート様の
垂下テールを垂下テール間に間隙を設けて連設し
てなる部材（たとえば水流傾斜板、商品名パトレ
シア、日本ソリツド(株)製）を設けることにより、
沈降槽のフイードウエル部では常に安定した活性
汚泥の濃度層が形成され、沈降部においても活性
汚泥の接触、過効果および干渉沈降がなされる
ため、いずれも活性汚泥廃水の接触時間が長くな
り原水の水量、水質などの変動に対しても充分に
安定した活性汚泥処理ができる。
以下に本発明方法および従来の活性汚泥処理方
法による効果を、製紙廃水および下水を用いて比
較する。
実施例 １
製紙工場よりの廃水を本発明方法および従来の
活性汚泥処理方法により処理した。
原水はBOD250〜500ppm、COD250〜
400ppm、SS150〜500ppmを含有し、またPHは
3.5〜8.5であつた。この原水を毎時300〜400m3の
流量で処理した。得られた結果を表１に示す。
The present invention relates to a method for treating organic wastewater. More particularly, the present invention relates to a method for treating wastewater containing organic substances using activated sludge organisms. Generally, the method of displaying pollutants in wastewater is
These include BOD (biological oxygen demand), COD (chemical oxygen demand) and SS (suspended solids). BOD is the amount of dissolved oxygen consumed by the growth or respiration of aerobic microorganisms in water.
COD is generally the oxygen consumption by potassium permanganate at 100°C, and SS is the solids dispersed and suspended in the water, such as organic matter, organisms, and clay particles. Activated sludge treatment is generally known to reduce these BOD and COD and remove SS. This activated sludge treatment method uses an aeration tank and a settling tank. The stirring in this aeration tank is performed by surface mechanical stirring or underwater aeration stirring by blowing oxygen or air into the water. These stirrings are performed in order to supply oxygen necessary for the growth of activated sludge in the aeration tank, and at the same time to forcefully stir the water in the tank to ensure sufficient contact between raw water and activated sludge. However, in the conventional method, activated sludge treatment had to be carried out under unstable conditions when the raw water amount and water quality fluctuated widely. That is, there are many cases in which changes in the biota during operation create blocks with low compaction, resulting in poor sedimentation of activated sludge (so-called bulking). The cause of this is that filamentous fungi multiply instead of normal activated sludge organisms. Such bulking is the biggest difficulty in managing activated sludge treatment methods. The present inventor has completed the present invention as a result of repeated research on activated sludge treatment methods that prevent such bulking. That is, in treating wastewater containing organic substances with activated sludge, the present invention attaches the activated sludge to members fixed or suspended in the aeration tank, and transfers the sludge drawn from the settling tank to the aeration tank and the settling tank. This activated sludge treatment method is characterized in that the activated sludge is returned to the inlet and the activated sludge adhesion member described above is provided in the settling tank. An embodiment of the present invention will be described with reference to the drawings. 1
is aeration tank, 2 is settling tank, 3 is sludge return pump, 4 is
is a float part of the activated sludge adhesion member, 5 is a hanging tail part of the activated sludge adhesion member, 6 is an organic wastewater introduction pipe, 7 is an introduction water pipe from the aeration tank to the settling tank, 8 is a return sludge pipe to the aeration tank, 9 10 is a return sludge pipe introduced into the settling tank, 10 is a treated water pipe, 11 is an aeration tank stirring device, and 12 is activated sludge adhering to the activated sludge adhesion member. Organic wastewater is introduced into the aeration tank 1 through an inlet pipe 6. Activated sludge adhering members 4 and 5 are suspended in the aeration tank, and a stirring device 1 is also installed.
1 is provided. When the stirring device 11 is operated and activated sludge is added, the activated sludge adheres to the adhesion member. The raw water treated in the aeration tank 1 is introduced into the settling tank 2. The sedimentation tank 2 is provided with an activated sludge adhering member similar to that described above. A portion of the activated sludge is returned from this settling tank by the sludge return pump 3. A part of this return sludge is returned to the aeration tank via a return sludge pipe 8 to the aeration tank, and the remaining part is returned to the settling tank via a return sludge pipe 9 introduced into the settling tank. In the present invention, the activated sludge adhering member is a member for adhering activated sludge to its surface,
Examples include objects such as plates, ropes, sheets, nets, strings, and perforated sheets, and these members are fixed or suspended with gaps provided inside the aeration tank, that is, in the water. This attachment member may be fixed to the bottom or side of the tank, or may be suspended by floating in the water within the tank. The attachment member is preferably one in which sheet-like hanging tails are arranged below the float body with gaps provided between the hanging tails. In the present invention, by fixing or suspending activated sludge adhering members with gaps, SS (suspended solids) contained in raw water are allowed to settle in front of the members, and raw water passes between the members. This promotes the settling of SS also on the back side of the member. Examples of the material for the attachment member include metals such as iron, synthetic resin fibers, and wood. The activated sludge used in the present invention is preferably a ciliate among protozoa. This is because the margin hair system has conditions that make it easy to adhere to the activated sludge adhering member in the tank, and can stably adhere to it. In the present invention, by equipping an aeration tank with an activated sludge adhesion member fixed or suspended inside the aeration tank (in water), the attached activated sludge can be used for both surface aeration and underwater aeration. Since it exists stably as a water source, the growth effect becomes large and the contact time with the raw water becomes long, so it can sufficiently respond to sudden changes in the flow rate and water quality of the raw water. Furthermore, since the aeration tank and settling tank are also equipped with activated sludge adhesion members, dead spaces are less likely to occur in either the aeration tank or settling tank. Since no dead space is created in this way, sludge putrefaction or anaerobic fermentation is less likely to occur, thus preventing bulking. In the present invention, a part of the activated sludge in the settling tank is
Since the activated sludge is mixed with the water introduced from the aeration tank to the settling tank and a portion is also introduced into the initial introduction part (feedwell part) of the settling tank, the concentration of activated sludge in the settling tank feedwell can be increased. Oxygen-containing gas can be blown into this returned sludge. In the present invention, the amount of activated sludge returned to the settling tank can vary widely depending on the nature of the treated water, but is preferably about 5 to 30% by weight of the total amount of returned sludge. In the present invention, an activated sludge adhesion member is also used in the sedimentation tank, such as a member in which sheet-like hanging tails are arranged below the float body with gaps between the hanging tails (for example, a water flow inclined plate, trade name: Patrecia). , manufactured by Nippon Solids Co., Ltd.),
A stable activated sludge concentration layer is always formed in the feedwell section of the settling tank, and contact, overeffect, and interference settling of activated sludge occur in the settling section as well, so the contact time of activated sludge wastewater increases and the raw water Activated sludge treatment can be performed in a sufficiently stable manner even with changes in water quantity, water quality, etc. The effects of the method of the present invention and the conventional activated sludge treatment method will be compared below using paper manufacturing wastewater and sewage. Example 1 Wastewater from a paper mill was treated by the method of the present invention and a conventional activated sludge treatment method. Raw water has BOD250~500ppm, COD250~
Contains 400ppm, SS150~500ppm, and PH is
It was between 3.5 and 8.5. This raw water was treated with a flow rate of 300-400 m 3 per hour. The results obtained are shown in Table 1.
【表】
実施例 ２
都市下水を用いて本発明方法と従来発明方法と
を比較した。原水はBOD20〜350ppm、COD30〜
350ppm、SS30〜300ppm、そしてPH6.5〜8.1であ
つた。この原水を毎時200〜600m3の流量で処理し
た。得られた結果を表２に示す。[Table] Example 2 The method of the present invention and the conventional method of the invention were compared using urban sewage. Raw water has BOD20~350ppm, COD30~
350ppm, SS30~300ppm, and PH6.5~8.1. This raw water was treated with a flow rate of 200 to 600 m 3 per hour. The results obtained are shown in Table 2.
第１図は本発明方法の概略図であり、第２図は
曝気槽の平面図であり、第３図は本発明の活性汚
泥付着部材の一例である。
１……曝気槽、２……沈降槽、３……汚泥返送
ポンプ、４……活性汚泥付着部材のフロート部
分、５……活性汚泥付着部材の垂下テール部分、
６……有機廃水導入管、７……曝気槽より沈降槽
への導入水管、８……曝気槽への返送汚泥管、９
……沈降槽に導入される返送汚泥管、１０……処
理水管、１１……曝気槽の撹拌装置、１２……活
性汚泥付着部材に付着した活性汚泥。
FIG. 1 is a schematic diagram of the method of the present invention, FIG. 2 is a plan view of an aeration tank, and FIG. 3 is an example of the activated sludge adhesion member of the present invention. 1... Aeration tank, 2... Sedimentation tank, 3... Sludge return pump, 4... Float part of activated sludge adhesion member, 5... Drooping tail part of activated sludge adhesion member,
6...Organic wastewater introduction pipe, 7...Introduction pipe from the aeration tank to the settling tank, 8...Sludge return pipe to the aeration tank, 9
... return sludge pipe introduced into the settling tank, 10 ... treated water pipe, 11 ... stirring device of the aeration tank, 12 ... activated sludge adhering to the activated sludge adhesion member.
Claims (1)
活性汚泥で処理するにあたり、曝気槽内に間隙を
設けて活性汚泥を付着せしめうる部材を設け且つ
沈降槽からの引抜き汚泥を曝気槽および沈降槽の
入口に返送し、且つ沈降槽内にも前記の活性汚泥
付着部材を設けることを特徴とする活性汚泥処理
方法。1. When treating wastewater containing organic substances with activated sludge in an aeration tank and a settling tank, a gap is provided in the aeration tank and a member to which activated sludge can adhere is provided, and the sludge drawn from the settling tank is transferred to the aeration tank and the settling tank. An activated sludge treatment method characterized in that the activated sludge is returned to the inlet of the sedimentation tank, and the activated sludge adhering member is provided also in the settling tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP185078A JPS5496260A (en) | 1978-01-13 | 1978-01-13 | Method of treating activated sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP185078A JPS5496260A (en) | 1978-01-13 | 1978-01-13 | Method of treating activated sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5496260A JPS5496260A (en) | 1979-07-30 |
| JPS6227877B2 true JPS6227877B2 (en) | 1987-06-17 |
Family
ID=11513019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP185078A Granted JPS5496260A (en) | 1978-01-13 | 1978-01-13 | Method of treating activated sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5496260A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3974958B2 (en) * | 1996-05-23 | 2007-09-12 | 榮一 田代 | Oil content processing apparatus and method for treating oil content in waste water |
-
1978
- 1978-01-13 JP JP185078A patent/JPS5496260A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5496260A (en) | 1979-07-30 |
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