JPH0228392B2 - - Google Patents
Info
- Publication number
- JPH0228392B2 JPH0228392B2 JP57115542A JP11554282A JPH0228392B2 JP H0228392 B2 JPH0228392 B2 JP H0228392B2 JP 57115542 A JP57115542 A JP 57115542A JP 11554282 A JP11554282 A JP 11554282A JP H0228392 B2 JPH0228392 B2 JP H0228392B2
- Authority
- JP
- Japan
- Prior art keywords
- activated sludge
- liquid
- nitrification
- wastewater
- permeable body
- 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
- 239000010802 sludge Substances 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002351 wastewater Substances 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 4
- 239000012466 permeate Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 11
- 238000005273 aeration Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 244000005700 microbiome Species 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray 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
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
本発明は、廃水の活性汚泥処理法に関するもの
である。
活性汚泥法においては、活性汚泥はBODなど
の生物資化成分から増殖する微生物と、廃水中の
生物不活性のSSとによつて形成されており、活
性汚泥単位重量あたりの微生物活性は、活性汚泥
中に占める微生物の割合で決定される。一方、通
常の活性汚泥処理では容易に資化されないSSを
多量に含んだ廃水、例えば多量のトイレツトペー
パーを含有するし尿系汚水などでは活性汚泥中に
多量の不活性SSを含有しており、活性汚泥単位
重量あたりのBOD除去活性、硝化活性、脱窒素
活性など水中の汚濁成分除去活性がSSを含まな
い廃水に比べて低いため、廃水の浄化効率が低い
などの問題点があつた。
本発明は、このような問題点を解消するため活
性汚泥中の不活性SSを選択的に除去し、活性汚
泥の活性を高めて処理装置の性能、廃水浄化効率
を向上させることを目的とするものである。
すなわち本発明は、廃水を活性汚泥返送ライン
を有する生物処理工程とその後段の固液分離工程
からなる活性汚泥処理システムで生物処理する方
法において、前記生物処理工程と固液分離工程と
の間の活性汚泥混合液流出ライン、硝化液循環ラ
インのいずれか少なくとも一つに、目開き１mm以
下好ましくは0.7mm以下の多孔透水体を使用する
多孔透水体分離工程を設けて前記活性汚泥混合液
及び／又は硝化循環液中の粗大な不活性浮遊物を
捕捉分離すると共に活性汚泥を含む液を透過させ
ることを特徴とする廃水の活性汚泥処理法であ
る。
次に、本発明の各実施態様を第１図〜第３図に
基づいて説明する。
第１図例は、多孔透水体２を生物処理工程つま
り曝気槽４1と固液分離工程５の中間に設けた場
合である。すなわち、廃水１を返送汚泥３と共に
曝気槽４1に流入せしめて生物処理し、曝気槽４1
から流出する活性汚泥混合液を目開き１mm以下好
ましくは0.7mm以下のスクリーンからなる多孔透
水体２に導いて生物不活性な粗大SS8′を除去し
たのち、固液分離工程５で分離水６と分離汚泥７
に分離し、分離水６はこのまま放流するか、ある
いはさらに高度処理たとえば凝集処理を行い、分
離汚泥７の一部を前記返送汚泥３とし、残部を余
剰汚泥８として引抜いて汚泥処理工程（図示せ
ず）で処理するものである。このフローでは、活
性汚泥混合液中の粗大で生物不活性なSSが分離
されるので返送汚泥３の廃水浄化機能が向上する
うえ、固液分離工程５が遠心分離機などの機械的
固液分離装置によるものであれば、粗大なSSに
よる遠心分離機の閉塞を防止することができる利
点がある。
第２図例は多孔透水体２を、直列に配置した２
基の曝気槽４2，４3間の流路に配設した場合であ
る。
次に、第３図の実施態様は、硝化槽４4で生成
したNOxを廃水１中のBOD成分を利用して除去
するため硝化液を脱窒素槽９に循環して行なうも
ので、多孔透水体２を硝化液循環ライン１０に配
備したものである。
この例では前記多孔透水体２の他に同様な多孔
透水体２′を、２点鎖線で示すように硝化槽４4と
固液分離工程５の中間に設けてもよく、また、該
多孔透水体２′のみを設け、多孔透水体２を省略
してもよい。
本発明では、多孔透水体２としてウエツジワイ
ヤを用いた傾斜板、あるはい回転ドラム式のもの
が推奨されるが、弁目構造又は網目構造のもの、
パンチングメタルを用いたものでもよい。多孔透
水体２が経時的に目詰まりを起こす場合には、ブ
ラシあるいは高圧水を噴射する自動洗浄装置を多
孔水体２に併設し、一定時間に毎洗浄するとよ
い。
しかして、本発明によれば活性汚泥中の夾雑物
が除去され、活性汚泥単位重量あたりの活性
（BOD除去、硝化及び脱窒素活性）が向上して廃
水の浄化効率が高くなり、所定の固液分離工程を
遠心分離機などの機械的固液分離装置により行う
場合には、前記夾雑物による装置の閉塞等のトラ
ブルが回避されるものである。
次に、本発明の実施例について述べる。
処理条件
第３図のフローシートに従つてし尿系汚水の
硝化脱窒素処理を行つた。
原水の性状：BOD 5200mg／
NH3−Ｎ 1300mg／
SS 14500mg／
原水流入量：３／日
脱窒素槽容積：15
硝化槽容積：15
スクリーン：いずれも傾斜スクリーンとし、目
開き1.5mm、1.0mm、0.7mm、0.3mmのものを使
用した
スクリーニングは硝化液を対象とし、各スク
リーンについて27日間の運転を行つた。
処理結果
活性汚泥の硝化活性、脱窒素活性の指標とし
て硝化槽汚泥の硝化速度、脱窒素速度を求め
た。結果は第１表に示すとおりで、スクリーン
の目開きを１mm以下とすることにより活性汚泥
の硝化活性及び脱窒素活性を向上させることが
できた。
The present invention relates to a method for treating wastewater with activated sludge. In the activated sludge method, activated sludge is formed by microorganisms that proliferate from biological components such as BOD and biologically inert SS in wastewater, and the microbial activity per unit weight of activated sludge is It is determined by the proportion of microorganisms in it. On the other hand, wastewater containing a large amount of SS that is not easily assimilated by normal activated sludge treatment, such as human waste wastewater containing a large amount of toilet paper, contains a large amount of inert SS in the activated sludge. Since the activity of removing pollutant components in water, such as BOD removal activity, nitrification activity, and denitrification activity per unit weight of activated sludge, is lower than that of wastewater that does not contain SS, there were problems such as low wastewater purification efficiency. In order to solve these problems, the present invention aims to selectively remove inert SS in activated sludge, increase the activity of activated sludge, and improve the performance of treatment equipment and wastewater purification efficiency. It is something. That is, the present invention provides a method for biologically treating wastewater with an activated sludge treatment system comprising a biological treatment step having an activated sludge return line and a subsequent solid-liquid separation step. A porous water permeable body separation step using a porous water permeable body with an opening of 1 mm or less, preferably 0.7 mm or less is provided in at least one of the activated sludge mixed liquid outflow line and the nitrified liquid circulation line to remove the activated sludge mixed liquid and/or the nitrified liquid circulation line. Alternatively, it is a wastewater activated sludge treatment method characterized by capturing and separating coarse inert suspended matter in the nitrification circulating liquid and allowing a liquid containing activated sludge to permeate. Next, each embodiment of the present invention will be described based on FIGS. 1 to 3. The example in FIG. 1 shows a case where the porous water-permeable body 2 is provided between the biological treatment process, that is, the aeration tank 41 and the solid-liquid separation process 5. That is, the wastewater 1 is caused to flow into the aeration tank 4 1 together with the returned sludge 3 and subjected to biological treatment .
The activated sludge mixture flowing out is introduced into a porous water permeable body 2 consisting of a screen with an opening of 1 mm or less, preferably 0.7 mm or less to remove biologically inactive coarse SS8', and then in a solid-liquid separation step 5, it is separated into separated water 6 and Separated sludge 7
The separated water 6 is either discharged as it is, or subjected to further advanced treatment, such as flocculation treatment, and a part of the separated sludge 7 is used as the return sludge 3, and the remainder is pulled out as surplus sludge 8, and then passed through the sludge treatment process (not shown). It is processed by In this flow, the coarse and biologically inert SS in the activated sludge mixture is separated, which improves the wastewater purification function of the returned sludge 3, and the solid-liquid separation step 5 is performed by mechanical solid-liquid separation using a centrifuge, etc. If the device is used, it has the advantage of being able to prevent clogging of the centrifuge due to coarse SS. The example in Figure 2 shows two porous water-permeable bodies 2 arranged in series.
This is a case where the aeration tanks 4 2 and 4 3 are arranged in a flow path between them. Next, in the embodiment shown in FIG. 3, the nitrification solution is circulated to the denitrification tank 9 in order to remove NOx generated in the nitrification tank 44 using the BOD component in the wastewater 1. A water-permeable body 2 is arranged in a nitrification liquid circulation line 10. In this example, in addition to the porous water permeable body 2, a similar porous water permeable body 2' may be provided between the nitrification tank 44 and the solid-liquid separation step 5 as shown by the two-dot chain line. It is also possible to provide only the body 2' and omit the porous water permeable body 2. In the present invention, as the porous water permeable body 2, an inclined plate using wedge wire, or a rotary drum type is recommended, but one with a valve mesh structure or a mesh structure,
It may also be one using punched metal. If the porous water-permeable body 2 becomes clogged over time, it is advisable to install a brush or an automatic cleaning device that sprays high-pressure water on the porous water body 2 and clean it at regular intervals. According to the present invention, impurities in activated sludge are removed, the activity per unit weight of activated sludge (BOD removal, nitrification and denitrification activity) is improved, wastewater purification efficiency is increased, and a predetermined solidification level is improved. When the liquid separation step is performed using a mechanical solid-liquid separator such as a centrifuge, troubles such as clogging of the device due to the foreign matter can be avoided. Next, examples of the present invention will be described. Treatment Conditions Nitrification and denitrification treatment of night soil wastewater was carried out according to the flow sheet shown in Figure 3. Raw water properties: BOD 5200mg / NH 3 -N 1300mg / SS 14500mg / Raw water inflow: 3/day Denitrification tank volume: 15 Nitrification tank volume: 15 Screen: All screens are inclined, with openings of 1.5mm, 1.0mm, Screening using 0.7 mm and 0.3 mm screens targeted nitrifying fluid, and each screen was operated for 27 days. Treatment Results The nitrification rate and denitrification rate of the nitrification tank sludge were determined as indicators of the nitrification and denitrification activities of activated sludge. The results are shown in Table 1, and it was possible to improve the nitrification activity and denitrification activity of activated sludge by setting the screen opening to 1 mm or less.
【表】
また活性汚泥混合液流出ラインについて同様
にスクリーニングを行つたところ、活性汚泥の
活性が向上することが確認できた。[Table] When the activated sludge mixture outflow line was similarly screened, it was confirmed that the activity of the activated sludge was improved.
第１図、第２図及び第３図は、本発明の各実施
態様を示すフローシートである。
１……廃水、２，２′……多孔透水体、３……
返送汚泥、４1，４2，４3……曝気槽、４4……硝
化槽、５……固液分離工程、６……分離水、７…
…分離汚泥、８……余剰汚泥、８′……粗大SS、
９……脱窒素槽、１０……硝化液循環ライン。
FIG. 1, FIG. 2, and FIG. 3 are flow sheets showing each embodiment of the present invention. 1...Wastewater, 2,2'...Porous water permeable body, 3...
Returned sludge, 4 1 , 4 2 , 4 3 ... aeration tank, 4 4 ... nitrification tank, 5 ... solid-liquid separation process, 6 ... separated water, 7 ...
...separated sludge, 8...excess sludge, 8'...coarse SS,
9... Denitrification tank, 10... Nitrification liquid circulation line.
Claims (1)
工程とその後段の固液分離工程からなる活性汚泥
処理システムで生物処理する方法において、前記
生物処理工程と固液分離工程との間の活性汚泥混
合液流出ライン、硝化液循環ラインのいずれか少
なくとも一つに、目開き１mm以下好ましくは0.7
mm以下の多孔透水体を使用する多孔透水体分離工
程を設けて前記活性汚泥混合液及び／又は硝化循
環液中の粗大な不活性浮遊物を捕捉分離すると共
に活性汚泥を含む液を透過させることを特徴とす
る廃水の活性汚泥処理法。1. In a method of biologically treating wastewater with an activated sludge treatment system consisting of a biological treatment process having an activated sludge return line and a subsequent solid-liquid separation process, the activated sludge mixture between the biological treatment process and the solid-liquid separation process At least one of the outflow line and nitrification liquid circulation line should have an opening of 1 mm or less, preferably 0.7
A porous water permeable body separation process using a porous water permeable body with a diameter of 1 mm or less is provided to capture and separate coarse inert suspended matter in the activated sludge mixed liquid and/or nitrification circulating liquid, and at the same time to allow the liquid containing activated sludge to permeate. A wastewater activated sludge treatment method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57115542A JPS596984A (en) | 1982-07-05 | 1982-07-05 | Treatment of waste water with activated sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57115542A JPS596984A (en) | 1982-07-05 | 1982-07-05 | Treatment of waste water with activated sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS596984A JPS596984A (en) | 1984-01-14 |
| JPH0228392B2 true JPH0228392B2 (en) | 1990-06-22 |
Family
ID=14665108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57115542A Granted JPS596984A (en) | 1982-07-05 | 1982-07-05 | Treatment of waste water with activated sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS596984A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63236597A (en) * | 1987-03-23 | 1988-10-03 | Nippon Gesuidou Jigyodan | Mechanical controlling method for mould bulking |
| JP2694072B2 (en) * | 1991-09-18 | 1997-12-24 | 株式会社クボタ | Lift control device |
| JP2004136220A (en) * | 2002-10-18 | 2004-05-13 | Ebara Corp | Biological treatment method for sewage at time of rainy weather and apparatus therefor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53145359A (en) * | 1977-05-23 | 1978-12-18 | Ishikawajima Harima Heavy Ind Co Ltd | Activated sludge disposal method |
-
1982
- 1982-07-05 JP JP57115542A patent/JPS596984A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53145359A (en) * | 1977-05-23 | 1978-12-18 | Ishikawajima Harima Heavy Ind Co Ltd | Activated sludge disposal method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS596984A (en) | 1984-01-14 |
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