JPH0523840B2 - - Google Patents
Info
- Publication number
- JPH0523840B2 JPH0523840B2 JP59180413A JP18041384A JPH0523840B2 JP H0523840 B2 JPH0523840 B2 JP H0523840B2 JP 59180413 A JP59180413 A JP 59180413A JP 18041384 A JP18041384 A JP 18041384A JP H0523840 B2 JPH0523840 B2 JP H0523840B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- tank
- section
- aeration tank
- concentration
- 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 - Lifetime
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
- Activated Sludge Processes (AREA)
- Treatment Of Sludge (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、排水の生物学的処理で発生する余剰
微生物を濃縮分離する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for concentrating and separating surplus microorganisms generated in biological treatment of wastewater.
従来の排水の生物学的処理、例えば活性汚泥処
理法における余剰汚泥の分離濃縮法を第３図に基
いて説明する。
A conventional biological treatment of wastewater, such as a method for separating and concentrating excess sludge in an activated sludge treatment method, will be explained with reference to FIG.
第３図において符号１は原水導入管、２は曝気
槽、３は沈殿槽、４は汚泥返送管、５は余剰活性
汚泥排出管、６は濃縮槽、７は濃縮分離水返送
管、８は濃縮汚泥排出管、９は濃縮汚泥貯槽、１
０は脱水機、１１は脱水ケーキ排出ライン、１２
は脱水分離水返送管、１３は沈殿分離水（処理
水）排出管を示す。 In Fig. 3, reference numeral 1 is a raw water introduction pipe, 2 is an aeration tank, 3 is a settling tank, 4 is a sludge return pipe, 5 is an excess activated sludge discharge pipe, 6 is a thickening tank, 7 is a concentrated separated water return pipe, and 8 is a Thickened sludge discharge pipe, 9 thickened sludge storage tank, 1
0 is the dehydrator, 11 is the dehydrated cake discharge line, 12
13 indicates a dehydrated separated water return pipe, and 13 indicates a precipitated separated water (treated water) discharge pipe.
原水導入管１から、汚泥返送管４からの返送汚
泥と共に曝気槽２に導入された原水（廃水）は、
曝気槽２中で活性汚泥処理され、処理された水は
活性汚泥と共に沈殿槽３に導かれ、該沈殿槽３中
で活性汚泥を沈降分離し、処理水は処理水排水管
１３を経て排出される。 The raw water (wastewater) introduced from the raw water introduction pipe 1 into the aeration tank 2 together with the return sludge from the sludge return pipe 4 is
The activated sludge is treated in the aeration tank 2, and the treated water is led together with the activated sludge to the settling tank 3, where the activated sludge is separated by sedimentation, and the treated water is discharged through the treated water drain pipe 13. Ru.
一方、沈殿槽３中で沈降分離された汚泥の一部
は汚泥返送管４を経て曝気槽に返送され、他は濃
縮槽６に移送され、該濃縮槽６中に0.5〜1.0日間
滞留せしめて濃縮する。 On the other hand, part of the sludge that has been sedimented and separated in the settling tank 3 is returned to the aeration tank via the sludge return pipe 4, and the other part is transferred to the thickening tank 6, where it remains for 0.5 to 1.0 days. Concentrate.
濃縮汚泥は濃縮汚泥排出管８より濃縮汚泥貯槽
９に移送した後脱水機１０等で脱水処理され、他
方濃縮槽６で分離された濃縮分離水はSS（浮遊固
形物）濃度が高く、また濃縮中に発生したスカム
等が含まれているため、濃縮分離水返送管７によ
り再び曝気槽に移送され処理されている。 The thickened sludge is transferred from the thickened sludge discharge pipe 8 to the thickened sludge storage tank 9 and then dehydrated in a dehydrator 10 etc. On the other hand, the concentrated separated water separated in the thickening tank 6 has a high SS (suspended solids) concentration and is Since the water contains scum and the like generated therein, it is transferred to the aeration tank again through the concentrated and separated water return pipe 7 for treatment.
前述の従来法による余剰汚泥の濃縮分離法にお
いては、曝気槽、沈殿槽とは別に比較的大容量の
他の槽が必要であるうえ、長時間の滞留による汚
泥の腐敗によつて発生する悪臭、スカムの発生等
の弊害を生じる欠点があつた。
In the conventional method for concentrating and separating excess sludge, as described above, in addition to the aeration tank and settling tank, another relatively large-capacity tank is required, and the odor generated by the rotting of sludge due to long-term retention is also a problem. However, there were drawbacks such as the generation of scum.
本発明は、排水を曝気槽、該曝気槽内部に区画
形成された汚泥濃縮部、沈澱槽或いは沈澱工程を
有する活性汚泥処理装置で処理する方法におい
て、排水の生物学的処理で発生する余剰微生物を
濃縮分離するに際し、前記汚泥濃縮部を区画する
壁の上端部上において該曝気槽の活性汚泥混合液
と汚泥濃縮部の液とが直接連通するように、前記
汚泥濃縮部の区画壁の上端部を曝気槽の液面下に
形成し、該汚泥濃縮部底部から濃縮汚泥を余剰微
生物としてのみ引き抜くことを特徴とする余剰微
生物の濃縮分離法であつて、前記従来技術の欠点
を解消し、更に一段と効率化された余剰微生物を
濃縮分離する方法を提供するものである。
The present invention provides a method for treating wastewater in an activated sludge treatment device having an aeration tank, a sludge concentration section sectioned inside the aeration tank, a settling tank, or a settling process, in which excess microorganisms generated during biological treatment of wastewater are removed. When concentrating and separating the sludge, the upper end of the partition wall of the sludge thickening section is placed so that the activated sludge mixture of the aeration tank and the liquid of the sludge thickening section directly communicate on the upper end of the wall that partitions the sludge thickening section. A method for concentrating and separating surplus microorganisms, characterized in that a part is formed below the liquid surface of an aeration tank, and concentrated sludge is extracted only as surplus microorganisms from the bottom of the sludge thickening part, which eliminates the drawbacks of the conventional technology, Furthermore, the present invention provides a method for concentrating and separating surplus microorganisms that is even more efficient.
次に本発明の実施態様について、第１図及び第
２図を参照しながら説明する。 Next, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
第１図は活性汚泥法による本発明の一実施の態
様を説明するための一部断面図で示したフロー
図、第２図は第１図に示されている曝気槽の平面
概略図である。 FIG. 1 is a flow diagram showing a partially sectional view for explaining an embodiment of the present invention using the activated sludge method, and FIG. 2 is a schematic plan view of the aeration tank shown in FIG. 1. .
第１図及び第２図において、各符号は第３図と
同じ部分は第３図と同じ符号で示し、符号１４は
曝気部、１５は濃縮部、１６は上端部、１７はバ
ルブ、１８はブロワー、１９はタイマーを示す。 In FIG. 1 and FIG. 2, the same parts as in FIG. 3 are indicated by the same symbols as in FIG. Blower, 19 indicates a timer.
原水（廃水）は、原水導入管１から、汚泥返送
管４からの返送汚泥とともに好気的条件下にある
曝気槽２に流入し、原水中の汚濁物質は活性汚泥
によつて酸化、分解されるが、汚濁物の一部は活
性汚泥の増殖に消費され、その分汚泥量が増加す
る。曝気槽２の中には上端部１６が曝気槽液面下
に区画形成された濃縮部１５が配備されており、
増加した汚泥分はこの濃縮部１５で沈降、濃縮さ
れ、濃縮汚泥貯槽９に排出される。濃縮部上端１
６は汚泥が流入し、また分離水が流出しうるよう
に水面下に埋没されているが、液面と上端部の間
が開きすぎていると、汚泥の濃縮部の有効容積が
小さくなるうえ曝気液の乱れの影響を受けて十分
な濃縮が不可能となる。一方、液面と上端部１６
の間が狭すぎると、濃縮部に対する汚泥の流入と
分離水の流出が円滑に行われなくなる。液面と上
端部１６の間〓は曝気槽の水深にもよるが通常
0.1〜0.5m程度が望ましい。濃縮部１５の位置は
第１図、第２図に示したように曝気槽２流出端で
もよいが、原水１の流入部以外であればいずれの
場所でもよい。また濃縮部上端の一部は水面上に
出ていても支障はない。濃縮部１５で濃縮された
余剰汚泥はバルブ１７の開閉によりあるいはポン
プを稼動して濃縮汚泥貯槽９に引き抜かれる。汚
泥の引き抜きは少量ずつ何回にも分けて行うのが
よい。これは濃縮部１５の最底部ほど圧密効果に
よつて汚泥濃度が高くなつているので、所定時間
の引き抜き量が同量であれば、所定時間内に回数
多く引き抜くことによつて、濃縮汚泥貯留槽に一
層濃厚な汚泥を貯留することができ脱水等の後処
理に有利だからである。濃縮汚泥の引き抜き回数
および１回の引き抜き量はタイマー１９によつて
バルブ１７の開閉回数、開時間を調節すればよ
い。また濃縮部の汚泥濃度を検出して所定濃度に
到達した時点で引き抜いてもよい。 Raw water (wastewater) flows from the raw water introduction pipe 1 into the aeration tank 2 under aerobic conditions together with the sludge returned from the sludge return pipe 4, and the pollutants in the raw water are oxidized and decomposed by the activated sludge. However, some of the pollutants are consumed by the growth of activated sludge, and the amount of sludge increases accordingly. In the aeration tank 2, there is provided a concentrating section 15 whose upper end 16 is sectioned below the liquid level of the aeration tank.
The increased sludge content is settled and concentrated in the thickening section 15, and is discharged to the thickened sludge storage tank 9. Concentrating section upper end 1
No. 6 is buried under the water surface so that sludge can flow in and separated water can flow out, but if there is too much space between the liquid level and the upper end, the effective volume of the sludge concentration section will become small. Sufficient concentration becomes impossible due to the turbulence of the aeration liquid. On the other hand, the liquid level and the upper end 16
If the gap is too narrow, sludge will not flow smoothly into the thickening section and separated water will not flow out smoothly. The distance between the liquid level and the upper end 16 depends on the water depth of the aeration tank, but is usually
Approximately 0.1 to 0.5m is desirable. The concentration section 15 may be located at the outflow end of the aeration tank 2 as shown in FIGS. 1 and 2, but may be located at any location other than the inflow section of the raw water 1. Further, there is no problem even if a part of the upper end of the concentrating section is exposed above the water surface. Excess sludge concentrated in the concentration section 15 is drawn into the concentrated sludge storage tank 9 by opening and closing a valve 17 or by operating a pump. It is best to remove the sludge in small amounts several times. This is because the concentration of sludge is higher at the bottom of the thickening section 15 due to the consolidation effect, so if the amount of sludge drawn in a given time is the same, by drawing more times in a given time, the thickened sludge can be stored. This is because thicker sludge can be stored in the tank, which is advantageous for post-processing such as dewatering. The number of times the thickened sludge is drawn and the amount of drawn sludge per time can be determined by adjusting the number of times the valve 17 is opened/closed and the opening time of the valve 17 using the timer 19. Alternatively, the sludge concentration in the thickening section may be detected and the sludge drawn out when a predetermined concentration is reached.
次に本発明の実施例について説明する。 Next, examples of the present invention will be described.
BOD220mg/の排水を1100m3／日処理する
MLSS濃度約4800mg/の活性汚泥曝気槽（4.5m
水深×4m×12m）の処理水流出端側に濃縮部
（4.5m水深×1m×1m）を設けタイマーを用いて
１時間毎に0.2m3の濃縮汚泥を引き抜いたところ
濃縮汚泥貯槽に濃度2.5〜2.7％の濃縮汚泥を余剰
活性汚泥として引き抜くことができた。なお、濃
縮部の原水導入端側の画壁頂部と水面との間隔は
0.3mであつた。 Treat 1100m3 /day of wastewater with a BOD of 220mg/day
Activated sludge aeration tank (4.5m) with MLSS concentration of approximately 4800mg/
A thickening section (4.5 m water depth x 1 m x 1 m) was installed at the outflow end of the treated water (water depth x 4 m x 12 m), and 0.2 m3 of thickened sludge was pulled out every hour using a timer, resulting in a concentration of 2.5 in the thickened sludge storage tank. ~2.7% of the thickened sludge could be extracted as surplus activated sludge. In addition, the distance between the top of the wall on the raw water introduction end side of the concentration section and the water surface is
It was 0.3m.
また同一槽で曝気−沈殿−上澄液排出−曝気の
工程を繰り返す回分式処理法で、BOD120mg/
の排水を２m3／日処理するMLSS3200mg/の回
分式曝気槽（1m水深×1m×1m）の処理水流出
端側に濃縮部（1m×水深×0.15m×0.15m）を設
け、タイマーで１時間毎に0.25の濃縮汚泥を引
き抜いたところ濃縮汚泥貯槽に濃度1.9〜2.1％の
濃縮汚泥を余剰活性汚泥として引き抜くことがで
きた。余剰汚泥の排出は濃縮部と濃縮汚泥貯槽の
水位差によつてバルブの開時に自動的に行われる
ようにした。 In addition, BOD120mg/
A concentration section (1m x water depth x 0.15m x 0.15m) is installed at the treated water outlet side of a batch type aeration tank (1m water depth x 1m x 1m) with MLSS 3200mg/ day that treats 2m3/day of wastewater. When 0.25% of thickened sludge was drawn out every hour, thickened sludge with a concentration of 1.9 to 2.1% could be drawn out as surplus activated sludge into the thickened sludge storage tank. Excess sludge was discharged automatically when the valve was opened, depending on the water level difference between the thickening section and the thickened sludge storage tank.
濃縮部の原水導入端側の画壁頂部と水面との間
隔は0.3mであつた。 The distance between the top of the wall on the raw water introduction end side of the concentrating section and the water surface was 0.3 m.
以上のように、本発明によつて従来の浮遊微生
物の濃縮法の欠点を解消することができ、次のよ
うな数多くの効果を得ることができる。
As described above, according to the present invention, the drawbacks of the conventional concentration method for airborne microorganisms can be overcome, and the following numerous effects can be obtained.
(1) 濃縮部を曝気槽内に配備できるので、濃縮部
槽壁の一部を曝気槽槽壁と兼用できるので建設
費が安い。(1) Since the concentration section can be placed inside the aeration tank, a part of the wall of the concentration section can also be used as the wall of the aeration tank, so construction costs are low.
(2) 濃縮部は従来の濃縮槽のような清澄域がない
ので、その分圧密域が大きくなり、効果的な濃
縮を行うことができる。(2) Since the concentrating section does not have a clarification zone like a conventional concentration tank, its partial pressure zone becomes large and effective concentration can be performed.
(3) 濃縮部上端が曝気槽液面下にあり、曝気液の
乱れを受けてスカムの形成が防止されるので効
果的な濃縮を行うことができる。(3) The upper end of the concentration section is below the liquid level in the aeration tank, which prevents scum formation due to turbulence of the aeration liquid, allowing for effective concentration.
(4) 濃縮部上層の液は自動的に入れかわるので従
来方式のように上澄水だけとり出して再度曝気
槽に返送して処理する必要がないため、曝気槽
の汚濁負荷の変動が軽減される。(4) Since the liquid in the upper layer of the concentrating section is automatically replaced, there is no need to take out only the supernatant water and return it to the aeration tank for treatment as in the conventional method, reducing fluctuations in the pollution load in the aeration tank. Ru.
(5) 沈殿槽汚泥の濃縮槽への移送、および濃縮分
離水の曝気槽への移送の必要がないため運転管
理が楽である。(5) Operation management is easy because there is no need to transfer settling tank sludge to a thickening tank or concentrated separated water to an aeration tank.
(6) 濃縮部で例え悪臭の原因となる汚泥の腐敗を
生じても、悪臭を含む分離水は自動的に曝気部
に流入して生物的に分解されるので、液から悪
臭を発生することが防止される。(6) Even if sludge that causes a bad odor decays in the thickening section, the separated water containing the bad odor will automatically flow into the aeration section and be biodegraded, so the liquid will not emit a bad odor. is prevented.
第１図は本発明の実施態様を説明するためのフ
ロー図、第２図は第１図に示す曝気槽の平面概略
図、第３図は従来の活性汚泥法を説明する為の図
面である。
１…原水導入管、２…曝気槽、３…沈殿槽、４
…汚泥返送管、６…濃縮槽、９…濃縮汚泥貯槽、
１０…脱水機、１３…処理水排出管、１４…曝気
部、１５…濃縮部、１６…上端部、１７…バル
ブ、１８…ブロワー、１９…タイマー。
Figure 1 is a flow diagram for explaining an embodiment of the present invention, Figure 2 is a schematic plan view of the aeration tank shown in Figure 1, and Figure 3 is a drawing for explaining the conventional activated sludge method. . 1... Raw water introduction pipe, 2... Aeration tank, 3... Sedimentation tank, 4
...Sludge return pipe, 6...Thickening tank, 9...Thickened sludge storage tank,
DESCRIPTION OF SYMBOLS 10... Dehydrator, 13... Treated water discharge pipe, 14... Aeration part, 15... Concentration part, 16... Upper end part, 17... Valve, 18... Blower, 19... Timer.
Claims (1)
た汚泥濃縮部、沈澱槽或いは沈澱工程を有する活
性汚泥処理装置で処理する方法において、排水の
生物学的処理で発生する余剰微生物を濃縮分離す
るに際し、前記汚泥濃縮部を区画する壁の上端部
上において該曝気槽の活性汚泥混合液と汚泥濃縮
部の液とが直接連通するように、前記汚泥濃縮部
の区画壁の上端部を曝気槽の液面下に形成し、該
汚泥濃縮部底部から濃縮汚泥を余剰微生物として
のみ引き抜くことを特徴とする余剰微生物の濃縮
分離法。1. In a method of treating wastewater with an aeration tank, a sludge concentration section compartmented inside the aeration tank, a settling tank, or an activated sludge treatment device having a settling process, excess microorganisms generated in the biological treatment of wastewater are concentrated and separated. When doing so, the upper end of the partition wall of the sludge thickening section is aerated so that the activated sludge mixture in the aeration tank and the liquid in the sludge thickening section directly communicate on the upper end of the wall that partitions the sludge thickening section. 1. A method for concentrating and separating surplus microorganisms, which is formed below the liquid surface of a tank, and is characterized in that the concentrated sludge is extracted from the bottom of the sludge concentrating section only as surplus microorganisms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59180413A JPS6161699A (en) | 1984-08-31 | 1984-08-31 | Concentrating and separating method of excess microorganisms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59180413A JPS6161699A (en) | 1984-08-31 | 1984-08-31 | Concentrating and separating method of excess microorganisms |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6161699A JPS6161699A (en) | 1986-03-29 |
| JPH0523840B2 true JPH0523840B2 (en) | 1993-04-05 |
Family
ID=16082817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59180413A Granted JPS6161699A (en) | 1984-08-31 | 1984-08-31 | Concentrating and separating method of excess microorganisms |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6161699A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10148474A1 (en) * | 2001-10-01 | 2003-05-08 | Koehler August Papierfab | Process and device for cleaning waste water |
| WO2015022709A1 (en) * | 2013-08-12 | 2015-02-19 | Hera S.P.A. | Process for aerobic sludge treatment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2235883B1 (en) * | 1973-07-05 | 1977-11-18 | Degremont Sa | |
| JPS5237307A (en) * | 1975-09-20 | 1977-03-23 | Shimadzu Corp | Grease injector for point |
| JPS5436417A (en) * | 1977-08-29 | 1979-03-17 | Nippon Soken Inc | Exhaust gas purifying equipment of internal combustion engine |
| HU178906B (en) * | 1979-09-26 | 1982-07-28 | Bhg Hiradastech Vallalat | Connecting device for connecting information sources particularly for central exchanges |
-
1984
- 1984-08-31 JP JP59180413A patent/JPS6161699A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6161699A (en) | 1986-03-29 |
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