JPH0442078B2 - - Google Patents
Info
- Publication number
- JPH0442078B2 JPH0442078B2 JP61070092A JP7009286A JPH0442078B2 JP H0442078 B2 JPH0442078 B2 JP H0442078B2 JP 61070092 A JP61070092 A JP 61070092A JP 7009286 A JP7009286 A JP 7009286A JP H0442078 B2 JPH0442078 B2 JP H0442078B2
- Authority
- JP
- Japan
- Prior art keywords
- wastewater
- intermittent aeration
- activated sludge
- orp
- treatment method
- 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)
Description
〔産業上の利用分野〕
この発明は汚水の処理方法に係り、特に単一処
理槽内で汚水を生物学的に処理したのち、処理水
を排出することを繰り返す回分式活性汚泥処理方
法に関する。
〔従来の技術〕
回分式活性汚泥処理方法は、単一槽内に流入さ
せた汚水を間欠的に曝気する間欠曝気工程、沈殿
工程及び上澄水である処理水の排出工程を１サイ
クルとして処理工程で構成されている。また各工
程はあらかじめ設定した時間で操作され、間欠曝
気によつて汚水中のBOD及び窒素、りんを除去
する方法である。
しかし、間欠曝気工程における間欠曝気をあら
かじめ設定した時間に基づいて繰り返す従来の方
法によれば、特に汚水の窒素濃度が少ないときに
は十分な硝化時間が得られるけれども脱窒時間が
不足する傾向を示し、また汚水の窒素濃度が多い
ときにはその逆の現象が生じるため、窒素除去性
能が一定せず、汚水の水質変動に追従できないと
いう欠点があつた。
〔発明が解決しようとする問題点〕
この発明の目的は、汚水の水質変動があつても
汚水中のBOD、窒素、りんを安定して除去する
ことができる回分式活性汚泥処理方法を提供する
にある。
〔問題点を解決するための手段〕
この発明は、汚水中の有機物や窒素化合物の分
解する過程が汚水に酸化還元電位（以下、ORP
という。）と密接に関連しているとの知見に基づ
き、ORPを指標として回分式活性汚泥処理方法
における前記間欠曝気工程での間欠曝気を制御す
るようにしたものである。すなわち、間欠曝気工
程においては、汚水を連続的に流入させながら、
汚水のORPを検出し、予め設定した下限値で酸
素含有ガスを供給し、予め設定した下限値で酸素
含有ガスの供給を停止することによつて間欠曝気
操作を制御することを特徴とする。ORPの設定
値は汚水の温度が低いときは相対的に高く設定
し、汚水の温度が高いときは相対的に低く設定す
ることが望ましい。
〔発明の実施例〕
次に本発明の実施例について説明する。第１図
に本発明に係る回分式活性汚泥処理装置を示す。
装置は処理槽１、水中攪拌機２、空気吹込み機
３、処理水排出装置５及び余剰汚泥引抜きポンプ
６から構成されている。
処理槽の容量は24m3で、１サイクル当りの汚水
流入量は８m3で実験を行つた。先ず水中攪拌機２
を作動させた状態にて処理槽１に汚水を流入す
る。
処理槽に設けたORP指示調節計４で汚水の
ORPを検出し、その指示値が予め設定したORP
下限値に達したとき空気吹込み機３で酸素の供給
を行い、ここで汚水の有機物の分解、有機体及び
アンモニア体窒素の硝化が行われる。
硝化反応が進み、汚水のORPは徐々に上昇し、
予め設定したORP上限値に達したとき空気吹込
み機３を停止させる。この状態で処理槽中の溶存
酸素濃度は徐々に低下し、無酸素の雰囲気とな
り、硝化反応で生成した亜硝酸及び硝酸体窒素は
窒素ガスに還元される。この脱窒反応の進行によ
つて汚水のORPは低下するので、ORP下限値に
達したときに再び空気吹込み機３で酸素を供給す
る。以上に述べた間欠曝気を数回繰り返すことに
よつて、汚水中のBOD、窒素、りんが効果的に
除去される。この間欠曝気工程３〜８時間、好ま
しくは４〜６時間行い、この間、汚水を連続的に
流入させる。本発明は汚水を連続的に流入させる
点とORPに基づく間欠曝気制御の組み合わせに
よつて初めて効果を発揮する。したがつて、間欠
曝気工程では処理槽１内の汚水は当初は水面が低
く、工程の終了時では汚水量が増加して水面が高
くなるように運転される。
ORP下限値は−50〜100mV、またORP上限値
は100〜160mVの範囲に設定することが望まし
い。さらに上・下限の設定巾は30〜120mVであ
ることが望ましい。
次に沈殿工程で処理槽１内の汚泥を静置沈降さ
せたのち排出工程に移り、この工程で処理水排出
装置５を作動させ上澄水である処理水を装置外へ
排出する。また増殖した余剰の汚泥は余剰汚泥引
抜きポンプ６で引抜くことで処理槽１内での汚泥
量を一定に維持する。第１表に前記装置を用い汚
水として下水を処理した実験結果を従来法と比較
して示す。従来法は間欠曝気工程における曝気時
間を20分、曝気停止時間を40分として繰り返した
場合であり、本発明法は前記のように間欠曝気を
ORPによつて制御した場合である。第１表から
明らかなように、処理水のBOD、Ｔ−Ｐは従来
法と本発明法では同等であるが、Ｔ−Ｎは本発明
法の方が著しく低く、本発明法は窒素除去性能が
格別にすぐれている。
[Industrial Field of Application] The present invention relates to a method for treating sewage, and more particularly to a batch activated sludge treatment method in which sewage is biologically treated in a single treatment tank and then the treated water is repeatedly discharged. [Prior art] A batch activated sludge treatment method consists of one cycle of an intermittent aeration step in which sewage flowing into a single tank is intermittently aerated, a precipitation step, and a discharge step of the treated water, which is supernatant water. It consists of In addition, each process is operated at preset times, and BOD, nitrogen, and phosphorus in wastewater are removed by intermittent aeration. However, according to the conventional method in which intermittent aeration in the intermittent aeration process is repeated based on a preset time, although sufficient nitrification time can be obtained, especially when the nitrogen concentration of wastewater is low, denitrification time tends to be insufficient. Moreover, when the nitrogen concentration of wastewater is high, the opposite phenomenon occurs, so that the nitrogen removal performance is not constant and there is a drawback that it is not possible to follow changes in the quality of wastewater. [Problems to be Solved by the Invention] The purpose of the invention is to provide a batch activated sludge treatment method that can stably remove BOD, nitrogen, and phosphorus from wastewater even if the water quality of the wastewater changes. It is in. [Means for Solving the Problems] This invention provides that the process of decomposing organic matter and nitrogen compounds in wastewater increases the oxidation-reduction potential (hereinafter referred to as ORP) of wastewater.
That's what it means. ), the intermittent aeration in the intermittent aeration step in the batch activated sludge treatment method is controlled using ORP as an index. In other words, in the intermittent aeration process, while the wastewater is continuously flowing in,
The intermittent aeration operation is controlled by detecting the ORP of wastewater, supplying oxygen-containing gas at a preset lower limit, and stopping the supply of oxygen-containing gas at the preset lower limit. It is desirable that the set value of ORP be set relatively high when the temperature of wastewater is low, and set relatively low when the temperature of wastewater is high. [Embodiments of the Invention] Next, embodiments of the present invention will be described. FIG. 1 shows a batch type activated sludge treatment apparatus according to the present invention.
The apparatus is composed of a treatment tank 1, an underwater agitator 2, an air blower 3, a treated water discharge device 5, and an excess sludge drawing pump 6. The capacity of the treatment tank was 24 m 3 , and the experiment was conducted with a wastewater inflow rate of 8 m 3 per cycle. First, underwater stirrer 2
Sewage flows into the treatment tank 1 in a state where it is operated. The ORP indicator controller 4 installed in the treatment tank
ORP is detected and the indicated value is the preset ORP
When the lower limit is reached, oxygen is supplied by the air blower 3, and here the decomposition of organic matter in the wastewater and the nitrification of organic matter and ammonia nitrogen are performed. As the nitrification reaction progresses, the ORP of wastewater gradually increases,
The air blower 3 is stopped when a preset ORP upper limit value is reached. In this state, the dissolved oxygen concentration in the treatment tank gradually decreases, creating an oxygen-free atmosphere, and the nitrite and nitrate nitrogen produced by the nitrification reaction are reduced to nitrogen gas. As the denitrification reaction progresses, the ORP of the wastewater decreases, so when the ORP lower limit is reached, oxygen is supplied again by the air blower 3. By repeating the intermittent aeration described above several times, BOD, nitrogen, and phosphorus in wastewater can be effectively removed. This intermittent aeration step is carried out for 3 to 8 hours, preferably 4 to 6 hours, during which time sewage is continuously introduced. The present invention is effective only through the combination of continuous inflow of wastewater and intermittent aeration control based on ORP. Therefore, in the intermittent aeration process, the sewage in the treatment tank 1 is operated so that the water level is low at the beginning, and the amount of sewage increases and the water level becomes high at the end of the process. It is desirable that the ORP lower limit value be set in the range of −50 to 100 mV, and the ORP upper limit value be set in the range of 100 to 160 mV. Further, it is desirable that the setting width of the upper and lower limits is 30 to 120 mV. Next, in the sedimentation step, the sludge in the treatment tank 1 is left to settle, and then the process moves to the discharge step, in which the treated water discharge device 5 is operated to discharge the treated water, which is supernatant water, out of the device. Moreover, the amount of sludge in the treatment tank 1 is maintained constant by pulling out the grown surplus sludge with the surplus sludge extraction pump 6. Table 1 shows the results of experiments in which sewage was treated as wastewater using the above-mentioned apparatus in comparison with conventional methods. In the conventional method, the aeration time in the intermittent aeration step is 20 minutes and the aeration stop time is 40 minutes, and the method of the present invention repeats the intermittent aeration process as described above.
This is the case when controlled by ORP. As is clear from Table 1, the BOD and T-P of the treated water are the same between the conventional method and the method of the present invention, but the T-N of the method of the present invention is significantly lower, and the nitrogen removal performance of the method of the present invention is is exceptionally good.
【表】【table】
本発明によれば、処理すべき汚水の水質変動に
対応して、汚水中のBOD、窒素、りんを安定し
て除去することができる。特に窒素除去性能が格
段にすぐれている。
According to the present invention, BOD, nitrogen, and phosphorus in wastewater can be stably removed in response to changes in the quality of wastewater to be treated. In particular, it has excellent nitrogen removal performance.
第１図は本発明を実施すめたの装置構成図、第
２図は本発明のORP制御による設定値の好まし
い範囲を示す図である。
１……処理槽、３……空気吹込み機、４……
ORP指示調節計、５……処理水排出装置。
FIG. 1 is a diagram showing the configuration of an apparatus in which the present invention is implemented, and FIG. 2 is a diagram showing a preferable range of set values by ORP control of the present invention. 1... treatment tank, 3... air blower, 4...
ORP indicating controller, 5... Treated water discharge device.
Claims (1)
を行う間欠曝気工程、沈殿工程及び上澄水の排出
工程の各工程を単一処理槽内で順次１サイクルと
して行う回分式活性汚泥処理方法において、前記
間欠曝気工程での汚水の酸化還元電位を検出し、
予め設定した下限値で酸素含有ガスを供給し、予
め設定した上限値で酸素含有ガスの供給を停止す
ることによつて、間欠曝気操作を制御し、その際
酸化還元電位の上限又は下限の設定値を汚水の温
度に対応して低い温度では高く、高い温度では低
く設定することを特徴とする回分式活性汚泥処理
方法。 ２ 酸化還元電位の上限値と下限値との設定巾を
30〜120mVとする特許請求の範囲第１項記載の
回分式活性汚泥処理方法。[Scope of Claims] 1. Batch type in which each step of an intermittent aeration step in which aeration is performed intermittently while continuously inflowing sewage, a precipitation step, and a supernatant water discharge step is carried out in one cycle in a single treatment tank. In the activated sludge treatment method, detecting the oxidation-reduction potential of wastewater in the intermittent aeration step,
The intermittent aeration operation is controlled by supplying oxygen-containing gas at a preset lower limit value and stopping the supply of oxygen-containing gas at a preset upper limit value, and in this case, setting the upper or lower limit of the redox potential. A batch activated sludge treatment method characterized by setting the value to be high at low temperatures and low at high temperatures in accordance with the temperature of wastewater. 2 Set the range of the upper and lower limits of the oxidation-reduction potential.
The batch activated sludge treatment method according to claim 1, wherein the voltage is 30 to 120 mV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61070092A JPS62227499A (en) | 1986-03-28 | 1986-03-28 | Batchwise treatment of activated sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61070092A JPS62227499A (en) | 1986-03-28 | 1986-03-28 | Batchwise treatment of activated sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62227499A JPS62227499A (en) | 1987-10-06 |
| JPH0442078B2 true JPH0442078B2 (en) | 1992-07-10 |
Family
ID=13421550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61070092A Granted JPS62227499A (en) | 1986-03-28 | 1986-03-28 | Batchwise treatment of activated sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62227499A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0291000A (en) * | 1988-09-27 | 1990-03-30 | Inax Corp | Batch-wise type soil water treatment process |
| JP7297597B2 (en) * | 2019-08-23 | 2023-06-26 | オルガノ株式会社 | Water treatment method and water treatment equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56161892A (en) * | 1980-05-17 | 1981-12-12 | Hiroshi Kishi | Unstationary active sludge process |
| JPS6064698A (en) * | 1983-09-19 | 1985-04-13 | Masahiro Masuda | Controlling apparatus of activated sludge process |
| JPS6115793A (en) * | 1984-06-29 | 1986-01-23 | Ebara Infilco Co Ltd | Treatment of organic waste water |
-
1986
- 1986-03-28 JP JP61070092A patent/JPS62227499A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62227499A (en) | 1987-10-06 |
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