JPS6254073B2 - - Google Patents
Info
- Publication number
- JPS6254073B2 JPS6254073B2 JP18782381A JP18782381A JPS6254073B2 JP S6254073 B2 JPS6254073 B2 JP S6254073B2 JP 18782381 A JP18782381 A JP 18782381A JP 18782381 A JP18782381 A JP 18782381A JP S6254073 B2 JPS6254073 B2 JP S6254073B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- tank
- biological treatment
- activated sludge
- wastewater
- 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 77
- 238000000034 method Methods 0.000 claims description 37
- 238000005273 aeration Methods 0.000 claims description 26
- 239000002351 wastewater Substances 0.000 claims description 8
- 238000004062 sedimentation Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000006228 supernatant 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
Description
【発明の詳細な説明】
本発明は活性汚泥法と固着型生物処理法を組合
せて廃水を生物学的に処理する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for biologically treating wastewater by combining an activated sludge method and a fixed biological treatment method.
従来、生物処理法ではまず活性汚泥法で２次処
理を行ない、更に固着型生物処理法で３次処理
（高度処理）を行なう２段生物処理法が行なわれ
ている。 Conventionally, a two-stage biological treatment method has been used in which secondary treatment is first performed using an activated sludge method, and then tertiary treatment (advanced treatment) is performed using a fixed biological treatment method.
活性汚泥法には、ばつ気槽内の汚泥濃度が低く
なると、単位汚泥量当りのBOD負荷量が増大
し、(1)処理水が悪化する、(2)バルキングが生じ、
汚泥の沈降性が悪くなる等の欠点があり、従来、
余剰汚泥を返送して汚泥濃度を高めて運転してい
る。しかし汚泥濃度が高くなりすぎると、ばつ気
槽内の溶存酸素が不足するため、ばつ気槽内汚泥
濃度2000〜4000mg/で運転する。返送した汚泥
の残りは余剰汚泥として系外に引き抜くわけであ
るが、通常のBOD容積負荷0.6〜0.8Kg・BOD／
m3・日ではBOD除去量の50％程度が汚泥に転換
され、その量だけ引き抜いていた。従つて、返送
汚泥量は活性汚泥法の沈殿池からのみの返送で充
分であり、実際に活性汚泥法の沈殿池からのみ汚
泥を返送していた。 In the activated sludge method, when the sludge concentration in the aeration tank decreases, the BOD load per unit amount of sludge increases, (1) the treated water deteriorates, (2) bulking occurs, and
Conventionally, there are disadvantages such as poor settling of sludge,
Excess sludge is sent back to increase the sludge concentration during operation. However, if the sludge concentration becomes too high, there will be a shortage of dissolved oxygen in the aeration tank, so operation is performed at a sludge concentration in the aeration tank of 2000 to 4000 mg/. The remainder of the returned sludge is drawn out of the system as surplus sludge, but the normal BOD volume load is 0.6 to 0.8 kg・BOD/
m 3 days, approximately 50% of the amount of BOD removed was converted to sludge, and only that amount was extracted. Therefore, the amount of sludge to be returned is sufficient to be returned only from the settling tank of the activated sludge method, and in fact, sludge was returned only from the settling tank of the activated sludge method.
しかしながらこのような構成にあつては、活性
汚泥法の余剰汚泥発生量が多く、その処理に多大
のエネルギーや労力を必要とするという欠点があ
る。 However, such a configuration has the drawback that the activated sludge method generates a large amount of surplus sludge, and its treatment requires a large amount of energy and labor.
本発明は、前記従来技術の欠点を解消し、汚泥
発生量の少ない廃水の生物学的処理方法を提供す
ることを目的とする。 An object of the present invention is to eliminate the drawbacks of the prior art and provide a biological treatment method for wastewater that generates less sludge.
本発明は、固着型生物処理で発生した余剰汚泥
中の微小後生動物、原生動物等が汚泥を餌として
摂取することを利用し、固着型生物処理法の余剰
汚泥の一部もしくは全部を活性汚泥ばつ気槽に返
送することによつて上記目的を達成したものであ
る。 The present invention utilizes the fact that microscopic metazoa, protozoa, etc. in the surplus sludge generated in the sessile biological treatment ingest the sludge as food, and converts some or all of the surplus sludge of the sessile biological treatment method into activated sludge. The above purpose was achieved by returning the material to the aeration tank.
固着型生物処理法は接触ばつ気法、回転円板
法、散水床法等であつてよい。このような方法
において発生する汚泥には、微小後生動物、原生
動物等、汚泥中の細菌を餌として摂取する生物が
多数存在する。従つて、これらの生物を活性汚泥
ばつ気槽に返送すると、ばつ気槽内の汚泥がこれ
らの生物により捕食され、汚泥量が減少する。 The sessile biological treatment method may be a contact aeration method, a rotating disk method, a sprinkle bed method, or the like. The sludge generated in such a method contains many organisms such as micrometazoans and protozoa that ingest the bacteria in the sludge as food. Therefore, when these organisms are returned to the activated sludge aeration tank, the sludge in the aeration tank is eaten by these organisms, and the amount of sludge decreases.
次に、図面に基づいて本発明を詳述する。 Next, the present invention will be explained in detail based on the drawings.
第１図は従来の２段生物処理法を実施する廃水
処理装置の系統図であり、第２図は本発明による
２段生物処理法を実施する廃水処理装置の系統図
である。第１図及び第２図において廃水処理装置
は、活性汚泥ばつ気槽３と沈殿池４から成る活性
汚泥式処理装置及び固着型生物処理槽６と沈殿池
７から成る固着型生物処理装置を直列に配置して
成る。流入管１より活性汚泥ばつ気槽３に流入し
た廃水は、従来法（第１図）では沈殿池４で沈殿
し、汚泥返送管２より返送された汚泥５により微
生物酸化され、本発明方法（第２図）では汚泥５
の他に汚泥返送管１１より沈殿池７で沈殿した汚
泥８により微生物酸化される。沈殿池４で固液分
離された汚泥の一部は、活性汚泥ばつ気槽３に返
送され、残りは余剰汚泥として系外に取り出され
る。 FIG. 1 is a system diagram of a wastewater treatment device that implements a conventional two-stage biological treatment method, and FIG. 2 is a system diagram of a wastewater treatment device that implements a two-stage biological treatment method according to the present invention. In Figs. 1 and 2, the wastewater treatment equipment includes an activated sludge type treatment equipment consisting of an activated sludge aeration tank 3 and a settling tank 4, and a fixed type biological treatment equipment consisting of a fixed type biological treatment tank 6 and a settling tank 7. It is arranged in In the conventional method (FIG. 1), wastewater flowing into the activated sludge aeration tank 3 from the inflow pipe 1 is precipitated in the settling tank 4, is microbially oxidized by the sludge 5 returned from the sludge return pipe 2, and is processed by the method of the present invention ( In Figure 2), sludge 5
In addition, the sludge 8 that has settled in the sedimentation tank 7 from the sludge return pipe 11 is oxidized by microorganisms. A part of the sludge separated into solid and liquid in the settling tank 4 is returned to the activated sludge aeration tank 3, and the rest is taken out of the system as surplus sludge.
沈殿池４の上澄水は３次処理（高度処理）とし
て固着型生物処理槽６で処理され、沈殿池７で固
液分離される。沈殿池７で固液分離された汚泥８
は、従来は排泥管９より排出されていたが、本発
明によれば汚泥返送管１１より活性汚泥ばつ気槽
３に返送する。 The supernatant water of the sedimentation tank 4 is treated in a fixed biological treatment tank 6 as a tertiary treatment (advanced treatment), and is separated into solid and liquid in a sedimentation tank 7. Sludge 8 separated into solid and liquid in settling tank 7
Conventionally, the sludge was discharged from the sludge discharge pipe 9, but according to the present invention, it is returned to the activated sludge aeration tank 3 from the sludge return pipe 11.
本発明の構成によれば、２次処理及び３次処理
の処理機能を全く損なうことなく、余剰汚泥発生
量を著しく減少することができる。 According to the configuration of the present invention, the amount of surplus sludge generated can be significantly reduced without impairing the processing functions of the secondary treatment and the tertiary treatment.
次に、実施例に基づいて本発明を詳述するが、
本発明はこれに限定されるものではない。 Next, the present invention will be explained in detail based on examples.
The present invention is not limited to this.
例 １
第２図に示した構造を有し、活性汚泥ばつ気槽
容積60m3、接触ばつ気槽容積45m3（固着型生物処
理として接触ばつ気法を用いた）の処理装置を用
いて、BOD245mg/（標準偏差σ＝63）の食品
廃水を流量9.2m3／時（活性汚泥槽の容積負荷0.9
Kg・BOD／m3・日）で連続処理した。このとき
の活性汚泥は、ばつ気槽MLSS2400mg/程度
で、SVI160ml/ｇ（標準偏差σ＝34）、汚泥返送
比0.6（汚泥返送比R/Q、Ｑ＝流入廃水量m3／
日、Ｒ＝返送汚泥量m3／日）で運転した。接触ば
つ気法の余剰汚泥比0.4で汚泥全量を返送した。
これらの条件下で３ヶ月間連続運転した。Example 1 Using a treatment device with the structure shown in Figure 2, an activated sludge aeration tank volume of 60 m 3 and a contact aeration tank volume of 45 m 3 (contact aeration method was used as a fixed biological treatment). Food wastewater with BOD 245 mg/(standard deviation σ = 63) at a flow rate of 9.2 m 3 /hour (volume load of activated sludge tank 0.9
Kg・BOD/m 3・day). The activated sludge at this time had an aeration tank MLSS of about 2400 mg/, an SVI of 160 ml/g (standard deviation σ = 34), and a sludge return ratio of 0.6 (sludge return ratio R/Q, Q = inflow wastewater volume m 3 /
The system was operated at a rate of R = return sludge amount m 3 /day). The entire amount of sludge was returned at a surplus sludge ratio of 0.4 using the contact aeration method.
It was operated continuously for 3 months under these conditions.
その後、比較のため第１図に示したように、接
触ばつ気処理汚泥の返送を行なわない以外は前記
と同じ条件で同じ廃水を処理した。 Thereafter, for comparison, as shown in FIG. 1, the same wastewater was treated under the same conditions as above, except that the contact aeration treated sludge was not returned.
第３図に処理水の水質の経日変化及び活性汚泥
法の余剰汚泥発生量の経日変化を示す。第３図に
おいて、１２は活性汚泥法の処理水の水質、１３
は接触ばつ気法の処理水の水質、１４は余剰汚泥
発生量である。本発明方法を行なつた期間Ａ（運
転開始後第90日まで）では、従来法を行なつた期
間Ｂ（運転開始後第90日から第180日まで）と比
べて、処理水の水質は同等であつたが、余剰汚泥
発生量は著しく少ない。即ち、余剰汚泥発生量
は、本発明方法では19Kg／日（標準偏差σ＝
1.3、除去BOD当りの汚泥転換率39％）、従来法で
は26Kg／日（標準偏差σ＝1.4、除去BOD当りの
汚泥転換率53％）であり、本発明方法の方が著し
く少なかつた。従来法では、更に接触ばつ気処理
による余剰汚泥が1.7Kg／日発生した。 Figure 3 shows the daily changes in the quality of treated water and the amount of surplus sludge generated by the activated sludge method. In Figure 3, 12 is the quality of water treated by the activated sludge method, and 13 is
is the quality of water treated by the contact aeration method, and 14 is the amount of surplus sludge generated. During period A (from the 90th day after the start of operation) when the method of the present invention was applied, the quality of the treated water was lower than during period B (from the 90th day to the 180th day after the start of operation) when the conventional method was used. However, the amount of surplus sludge generated was significantly lower. In other words, the amount of surplus sludge generated by the method of the present invention is 19 kg/day (standard deviation σ =
1.3, sludge conversion rate per removed BOD 39%), the conventional method had 26 kg/day (standard deviation σ = 1.4, sludge conversion rate per removed BOD 53%), and the method of the present invention was significantly lower. In the conventional method, an additional 1.7 kg/day of surplus sludge was generated due to contact aeration treatment.
接触ばつ気法の汚泥には微小後生動物、原生動
物等の、汚泥中の細菌を餌として摂取する生物が
多数生存するので、本発明方法によりこれらの生
物を活性汚泥ばつ気槽に返送することにより、汚
泥の捕食が進行し、汚泥量が減少したものと考え
られる。 In the sludge of the contact aeration method, there are many organisms such as micrometazoa and protozoa that ingest bacteria in the sludge as food, so these organisms can be returned to the activated sludge aeration tank using the method of the present invention. It is thought that the predation of sludge progressed and the amount of sludge decreased.
なお、前記実施例においては、２段目に接触ば
つ気法を用いたが、回転円板法、散水床法等を
使用しても同様の結果が得られる。 In the above examples, a contact aeration method was used in the second stage, but similar results can be obtained by using a rotating disk method, a sprinkled bed method, or the like.
第１図は従来の２段生物処理法による廃水の処
理装置の系統図、第２図は本発明の２段生物処理
法による廃水の処理装置の系統図、第３図は従来
法及び本発明方法による処理水の水質及び活性汚
泥法の余剰汚泥発生量の経日変化を示すグラフで
ある。
符号の説明 ３…活性汚泥ばつ気槽、４，７…
沈殿池、６…接触ばつ気槽、２，１１…汚泥返送
管。
Figure 1 is a system diagram of a wastewater treatment device using the conventional two-stage biological treatment method, Figure 2 is a system diagram of a wastewater treatment equipment using the two-stage biological treatment method of the present invention, and Figure 3 is a diagram of the conventional method and the present invention. It is a graph showing daily changes in the quality of treated water and the amount of surplus sludge generated in the activated sludge method. Explanation of symbols 3...Activated sludge aeration tank, 4, 7...
Sedimentation tank, 6... Contact aeration tank, 2, 11... Sludge return pipe.
Claims (1)
式処理装置の後段に生物膜を利用した接触槽と沈
殿池から成る固着型生物処理装置を直列に配置し
た装置により廃水を処理する場合、固着型生物処
理装置の余剰汚泥の一部もしくは全部を活性汚泥
ばつ気槽に返送することを特徴とする廃水の生物
学的処理方法。1. When wastewater is treated with a device in which an activated sludge treatment device consisting of an activated sludge aeration tank and a sedimentation tank is followed by a fixed-type biological treatment device consisting of a contact tank and a settling tank using biofilm, the fixed type biological treatment device is arranged in series. A biological treatment method for wastewater, characterized in that part or all of surplus sludge from a biological treatment device is returned to an activated sludge aeration tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56187823A JPS5889990A (en) | 1981-11-25 | 1981-11-25 | Biological treatment for waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56187823A JPS5889990A (en) | 1981-11-25 | 1981-11-25 | Biological treatment for waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5889990A JPS5889990A (en) | 1983-05-28 |
| JPS6254073B2 true JPS6254073B2 (en) | 1987-11-13 |
Family
ID=16212855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56187823A Granted JPS5889990A (en) | 1981-11-25 | 1981-11-25 | Biological treatment for waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5889990A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010012458A (en) * | 2008-06-06 | 2010-01-21 | Asahi Kasei Chemicals Corp | Method for treating organic wastewater and apparatus for treating wastewater |
| EP2447223A2 (en) | 2004-02-02 | 2012-05-02 | Kurita Water Industries Ltd. | Process for biological treatment of organic waste water and apparatus therefor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013202579A (en) * | 2012-03-29 | 2013-10-07 | Nippon Steel & Sumikin Eco-Tech Corp | Biological treatment method for organic wastewater |
| JP6934358B2 (en) * | 2017-08-18 | 2021-09-15 | 水ｉｎｇ株式会社 | Organic wastewater treatment equipment and treatment method |
-
1981
- 1981-11-25 JP JP56187823A patent/JPS5889990A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2447223A2 (en) | 2004-02-02 | 2012-05-02 | Kurita Water Industries Ltd. | Process for biological treatment of organic waste water and apparatus therefor |
| EP2447222A2 (en) | 2004-02-02 | 2012-05-02 | Kurita Water Industries Ltd. | Process for biological treatment of organic waste water and apparatus therefor |
| JP2010012458A (en) * | 2008-06-06 | 2010-01-21 | Asahi Kasei Chemicals Corp | Method for treating organic wastewater and apparatus for treating wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5889990A (en) | 1983-05-28 |
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