JPH04338292A - Automatic controller for inflow rate of raw water to activated sludge treating equipment - Google Patents
Automatic controller for inflow rate of raw water to activated sludge treating equipmentInfo
- Publication number
- JPH04338292A JPH04338292A JP3138290A JP13829091A JPH04338292A JP H04338292 A JPH04338292 A JP H04338292A JP 3138290 A JP3138290 A JP 3138290A JP 13829091 A JP13829091 A JP 13829091A JP H04338292 A JPH04338292 A JP H04338292A
- Authority
- JP
- Japan
- Prior art keywords
- raw water
- aeration tank
- activated sludge
- value
- inflow
- 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.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000010802 sludge Substances 0.000 title claims abstract description 47
- 238000005273 aeration Methods 0.000 claims abstract description 57
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 239000005416 organic matter Substances 0.000 claims description 20
- 230000000813 microbial effect Effects 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 abstract description 17
- 239000001301 oxygen Substances 0.000 abstract description 17
- 244000005700 microbiome Species 0.000 abstract description 4
- 238000011071 total organic carbon measurement Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 4
- 241001148470 aerobic bacillus Species 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000009897 systematic effect Effects 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
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は活性汚泥処理設備の常時
変動する有機物含有流入原水を曝気槽の汚泥負荷値が所
定の値を保持するようにその量を制御し、活性汚泥処理
を安定化する自動制御装置に関する。[Industrial Application Field] The present invention stabilizes activated sludge treatment by controlling the amount of raw water containing organic matter that constantly fluctuates in the activated sludge treatment equipment so that the sludge load value in the aeration tank maintains a predetermined value. This invention relates to an automatic control device.
【０００２】0002
【従来の技術】工業からのまた家庭から等の有機物を含
んだ排水（原水）を処理する設備として、原水を空気、
酸素曝気槽に流入し空気、酸素を吹き込み、原水中の有
機物を好気性菌の繁殖によって酸化分解し活性汚泥を生
成せしめて沈澱槽に導き、上澄液を下水道放流水とし放
出し、活性汚泥は共残する好気性菌を再度、この活性汚
泥処理に返送汚泥として使用する所謂排水の活性汚泥処
理設備は一般に用いられている。[Prior Art] As equipment for treating wastewater (raw water) containing organic matter from industries and households, raw water is
Air and oxygen are blown into the oxygen aeration tank, and the organic matter in the raw water is oxidized and decomposed by the growth of aerobic bacteria to produce activated sludge, which is led to the settling tank, and the supernatant liquid is released as sewer discharge water, and activated sludge is A so-called wastewater activated sludge treatment facility is generally used in which the remaining aerobic bacteria are used as return sludge for this activated sludge treatment.
【０００３】上記活性汚泥設備は、曝気槽の汚泥負荷〔
その曝気槽の取り込める栄養分の量（有機物）と栄養分
を食う菌の数の比〕に応じた有機物を含む原水を曝気槽
に流入しないと、原水の有機物濃度により曝気槽の汚泥
負荷が不安定である。即ち、原水の有機物の濃度が大で
あると、汚泥負荷は大となり、逆に原水の有機物の濃度
が小であると汚泥負荷は小となる。そして、一般に曝気
の手段、空気か酸素かによって汚泥負荷の適正値は大体
定まっている。しかし、流入原水の有機物濃度の変動に
より汚泥負荷は前述のように安定しない。その結果、曝
気槽内微生物が急激に増えて酸素欠乏状態になり、微生
物が大量に死滅し赤潮様の状態が生じるという問題があ
った。また、適正汚泥負荷より大なる有機物を含む原水
が流入した場合は、充分な活性汚泥処理が行われない排
水が次の工程に移動し、また、適正汚泥負荷より小なる
有機物を含む原水が流入した場合は、曝気槽が充分に利
用されず効率が悪い等の問題点があった。そこで、これ
らの問題点を解決するため、流入原水の有機物濃度を測
定し、この測定値を勘案して原水の流入量を調節する方
法が行われていた。[0003] The above-mentioned activated sludge equipment has a sludge load in the aeration tank [
Unless raw water containing organic matter flows into the aeration tank according to the ratio of the amount of nutrients (organic matter) that the aeration tank can take in and the number of bacteria that eat the nutrients, the sludge load in the aeration tank will become unstable due to the concentration of organic matter in the raw water. be. That is, if the concentration of organic matter in raw water is high, the sludge load will be high, and conversely, if the concentration of organic matter in raw water is low, the sludge load will be low. In general, the appropriate value of the sludge load is roughly determined depending on the aeration method, air or oxygen. However, the sludge load is not stable as mentioned above due to fluctuations in the organic matter concentration of the influent raw water. As a result, the number of microorganisms in the aeration tank rapidly increases, resulting in an oxygen-deficient state, causing a large number of microorganisms to die, resulting in a red tide-like situation. Additionally, if raw water containing organic matter greater than the appropriate sludge load flows in, wastewater that has not been sufficiently treated with activated sludge will be transferred to the next process, and raw water containing organic matter less than the appropriate sludge load will flow in. In this case, there were problems such as the aeration tank was not fully utilized and the efficiency was poor. Therefore, in order to solve these problems, a method has been used in which the concentration of organic matter in inflowing raw water is measured and the amount of inflowing raw water is adjusted in consideration of this measured value.
【０００４】0004
【発明が解決しようとする課題】上記活性汚泥処理設備
において、その流入原水を原水の有機物濃度の測定、そ
の値により原水流入量を調節する方法においては、有機
物濃度の測定は自動化ができず手分析で行わなければな
らず、また、この分析値に基いて原水流入量の調節も全
て人力で行わなければならなかった。従って、その操作
に時間や手間が掛かるばかりのでなく、種々の濃度に刻
々に変化する原水の有機物の含量に対応することはでき
なかった。本発明は、これらの欠点を解消し、如何に流
入原水中の有機物の量が変動しても曝気槽の適正汚泥負
荷を保持する流入原水量を自動的に制御する装置を提供
することを目的とするものである。[Problems to be Solved by the Invention] In the above-mentioned activated sludge treatment equipment, in the method of measuring the organic matter concentration of the incoming raw water and adjusting the amount of raw water inflow based on that value, the measurement of the organic matter concentration cannot be automated and cannot be done manually. This had to be done by analysis, and all adjustments to the amount of raw water inflow had to be done manually based on the analytical values. Therefore, not only is the operation time-consuming and labor-intensive, but it has not been possible to cope with the content of organic matter in raw water, which changes from time to time to various concentrations. The purpose of the present invention is to eliminate these drawbacks and provide a device that automatically controls the amount of inflow raw water that maintains an appropriate sludge load in the aeration tank no matter how much the amount of organic matter in the inflow water fluctuates. That is.
【０００５】[0005]
【課題を解決するための手段】本発明等は曝気槽の汚泥
負荷が原水ＢＯＤ濃度と原水量の積に対する曝気槽容量
と曝気槽微生物濃度〔ＶＳＳ｛ＶＳＳ＝（微生物濃度＋
無機物濃度）×０．６｝〕の割合であることを見出し、
かつ、原水ＢＯＤ濃度は自動測定ができる原水有機性炭
素濃度（ＴＯＣ）に換算できることにより、活性汚泥処
理設備の曝気槽の汚泥負荷を所定の値に設定すると流入
原水に含有されている有機物濃度により、設定値に適合
した原水量をコンピュータにより即座に計算し、それに
適合した原水の流入調節を自動的に実施する装置を見出
した。[Means for Solving the Problems] The present invention and others provide a method in which the sludge load in the aeration tank is determined by the aeration tank capacity and the aeration tank microbial concentration [VSS {VSS = (microbial concentration +
Inorganic concentration) x 0.6}
Moreover, since the raw water BOD concentration can be converted into raw water organic carbon concentration (TOC), which can be automatically measured, if the sludge load in the aeration tank of the activated sludge treatment equipment is set to a predetermined value, the concentration of organic matter contained in the inflow raw water will be reduced. We have discovered a device that uses a computer to instantly calculate the amount of raw water that matches the set value, and automatically adjusts the inflow of raw water to match the calculated amount.
【０００６】本発明は、活性汚泥処理設備において、原
水の有機性炭素濃度値及び曝気槽の微生物濃度値をコン
ピュータに入力し、この測定値により曝気槽の汚泥負荷
値が所定の流入原水の有機物濃度を算出し、それに基づ
き流入原水量を算出し流入原水調整装置を制御する活性
汚泥処理設備への流入原水量自動制御装置である。[0006] In activated sludge treatment equipment, the present invention inputs the organic carbon concentration value of raw water and the microbial concentration value of the aeration tank into a computer, and uses these measured values to determine the sludge load value of the aeration tank to a predetermined level of organic matter in the inflow raw water. This is an automatic control device for the amount of raw water flowing into activated sludge treatment equipment that calculates the concentration, calculates the amount of raw water flowing in based on the concentration, and controls the raw water regulating device.
【０００７】本発明の活性汚泥処理設備は、一般に用い
られている方式の設備である。例えば、原水を調整槽に
流入し、この調整槽から導管を通して、曝気槽に導く、
曝気槽は空気を吹き込み曝気する空気曝気槽又は酸素を
吹き込んで曝気する酸素曝気槽がある。ここで曝気処理
された好気性菌を含んだ活性汚泥液は沈澱槽に導管によ
り導かれ、上澄液は下水道放流水として放出され、沈澱
物は好気性菌があるので曝気槽の好気性菌として利用す
るため曝気槽に返送される。The activated sludge treatment equipment of the present invention is of a generally used type. For example, raw water flows into a regulating tank and is led from this regulating tank to an aeration tank through a conduit.
The aeration tank includes an air aeration tank in which air is blown for aeration, and an oxygen aeration tank in which oxygen is blown in for aeration. The aerated activated sludge liquid containing aerobic bacteria is led to the settling tank through a conduit, and the supernatant liquid is discharged as sewer discharge water. The water is returned to the aeration tank for use as wastewater.
【０００８】本発明においては、上記活性汚泥処理設備
において、流水原水導管から原水有機性炭素濃度（ＴＯ
Ｃ）計に一部原水を導き、曝気槽中に汚泥濃度〔ＭＬＳ
Ｓ〕計を設けこの値をコンピュータに入力し、この入力
データを次の〔数１〕により計算する。In the present invention, in the activated sludge treatment equipment, raw water organic carbon concentration (TO
C) Part of the raw water is introduced into the meter, and the sludge concentration [MLS
S] is provided, this value is input into a computer, and this input data is calculated using the following [Equation 1].
【数１】
曝気槽ＭＬＳＳ濃度、原水ＴＯＣ濃度の測定値を代入す
る。汚泥負荷値は、実施の統系値で空気曝気槽の場合は
０．３酸素曝気槽の場合は０．８を所定値とする。２．
７×原水ＴＯＣ濃度＋６００は原水ＢＯＤの値である。
槽容積は使用する活性汚泥処理設備の設計により定まる
。２４は時間当りの原水流量の換算係数。なお、調整槽
の水位が高いとき又は低いときは、上記〔数１〕の算出
値を原水流量にそのまま設定すると、実施において若干
の問題があるから、算出値に補正値を掛けた値を設定値
とし、円滑に安定した原水流量を調節する。しかし、酸
素曝気槽は空気曝気槽に比べて負荷の変動に弱いため、
調整槽の水位が０．８ｍより高い時は空気曝気槽のみで
原水流量の補正を行い、０．８ｍ以下になった時は、空
気曝気槽及び酸素曝気槽の両方で補正を行う。実施にお
いては調整槽に水位レベル計を設けて、上記の範囲に水
位を保持するようにして行う。[Equation 1] Substitute the measured values of the aeration tank MLSS concentration and raw water TOC concentration. The sludge load value is a predetermined systematic value of 0.3 in the case of an air aeration tank and 0.8 in the case of an oxygen aeration tank. 2.
7 x raw water TOC concentration + 600 is the value of raw water BOD. The tank volume is determined by the design of the activated sludge treatment equipment used. 24 is the conversion coefficient of raw water flow rate per hour. In addition, when the water level in the adjustment tank is high or low, if the calculated value of [Equation 1] above is set as the raw water flow rate, there will be some problems in implementation, so set a value that is the calculated value multiplied by the correction value. value and adjust the raw water flow rate smoothly and stably. However, oxygen aeration tanks are more susceptible to load fluctuations than air aeration tanks, so
When the water level in the adjustment tank is higher than 0.8 m, the raw water flow rate is corrected only in the air aeration tank, and when it is below 0.8 m, correction is performed in both the air aeration tank and the oxygen aeration tank. In practice, a water level gauge is installed in the adjustment tank to maintain the water level within the above range.
【０００９】[0009]
【実施例】図１は本発明の曝気槽として空気曝気槽及び
酸素曝気槽を併用した場合の一実施例を示すブロック図
である。１は酸素曝気槽、２は空気曝気槽、３は制御装
置、４はＴＯＣ計、５はＭＬＳＳ計、６は調整槽、７は
レベル計、８は流量調節弁、Ａ，Ｂ，Ｃ，Ｄは導管を示
す。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment in which an air aeration tank and an oxygen aeration tank are used together as the aeration tank of the present invention. 1 is an oxygen aeration tank, 2 is an air aeration tank, 3 is a control device, 4 is a TOC meter, 5 is a MLSS meter, 6 is an adjustment tank, 7 is a level meter, 8 is a flow rate control valve, A, B, C, D indicates a conduit.
【００１０】本図において、酸素曝気系を上部に、空気
曝気系を下部に図示した。原水は導管Ａにより調整槽６
に流入し、調整槽の原水のレベルを出来るだけ一定に保
持するようレベル計７により監視する、本実施例の設定
においては１．５〜３．０ｍに保持する。原水はこの調
整槽より導管Ｂを通って流量調節弁８が設けられた導管
Ｃにより酸素曝気槽１（１０００ｍ３）に流入される。
また分岐された原水は流量調節弁８′が設けられた導管
Ｄにより空気曝気槽２（３０００ｍ３）に流入される。
有機物を含んだ原水は酸素曝気槽並びに空気曝気槽にお
いて活性汚泥処理が施され、この処理汚泥は次の沈澱工
程に送られる。
以上の活性汚泥処理設備において、導管ＢにＴＯＣ計４
が設けられ、原水の有機性炭素濃度を自動的に測定し、
その値を制御装置３に入力する。また酸素曝気槽１及び
空気曝気槽２にＭＬＳＳ計５，５′が設けられ、各槽中
の原水の微生物濃度を自動的に測定し、その値を制御装
置３に入力する。このように、ＴＯＣ値並びにＭＬＳＳ
値が入力された制御装置は〔数１〕の計算を行って、こ
のシステムに適合した原水流量を算出し、それに基づい
て曝気槽への流量調節弁８，８′を調節する。In this figure, the oxygen aeration system is shown at the top, and the air aeration system is shown at the bottom. Raw water is sent to adjustment tank 6 via conduit A.
The level of the raw water flowing into the adjustment tank is monitored by a level meter 7 to keep it as constant as possible. In the settings of this embodiment, it is maintained at 1.5 to 3.0 m. From this regulating tank, raw water passes through a conduit B and flows into an oxygen aeration tank 1 (1000 m3) through a conduit C provided with a flow rate regulating valve 8. Further, the branched raw water flows into the air aeration tank 2 (3000 m3) through a conduit D provided with a flow rate control valve 8'. Raw water containing organic matter is subjected to activated sludge treatment in an oxygen aeration tank and an air aeration tank, and this treated sludge is sent to the next settling step. In the above activated sludge treatment equipment, there is a total of 4 TOCs in conduit B.
is installed to automatically measure the organic carbon concentration of raw water,
The value is input to the control device 3. Further, MLSS meters 5 and 5' are provided in the oxygen aeration tank 1 and the air aeration tank 2, and automatically measure the microbial concentration of the raw water in each tank, and input the values to the control device 3. In this way, TOC value as well as MLSS
The control device into which the value has been input calculates the flow rate of raw water that is suitable for this system by calculating the formula (1), and adjusts the flow rate control valves 8 and 8' to the aeration tank based on the calculated raw water flow rate.
【００１１】[0011]
【発明の効果】本発明は原水の活性汚泥処理装置におい
て、常時変動する有機物含有原水を曝気槽の汚泥負荷値
が所定の値を保持するように原水流入量を適正に自動的
に制御し、活性汚泥処理の安定化を行う極めて有用な発
明である。[Effects of the Invention] The present invention provides an activated sludge treatment device for raw water, which automatically controls the amount of raw water flowing into the aeration tank so that the sludge load value of the aeration tank is maintained at a predetermined value. This is an extremely useful invention that stabilizes activated sludge treatment.
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.
１ 酸素曝気槽 ２ 空気曝気槽 ３ 制御装置 ４ ＴＯＣ計 ５ ＭＬＳＳ計 ６ 調整槽 ７ レベル計 ８ 流量調節弁 Ａ，Ｂ，Ｃ，Ｄ，Ｅ，Ｆ，Ｇ 導管 1 Oxygen aeration tank 2 Air aeration tank 3 Control device 4 TOC meter 5 MLSS meter 6 Adjustment tank 7 Level meter 8 Flow control valve A, B, C, D, E, F, G conduit
Claims (1)
有機性炭素濃度値及び曝気槽の微生物濃度値をコンピュ
ータに入力し、この測定値により曝気槽の汚泥負荷値が
所定の流入原水の有機物濃度を算出し、それに基づき流
入原水量を算出し流入原水調整装置を制御することを特
徴とする活性汚泥処理設備への流入原水量自動制御装置
。Claim 1: In an activated sludge treatment facility, the total organic carbon concentration value of the raw water and the microbial concentration value of the aeration tank are input into a computer, and the sludge load value of the aeration tank is determined from the measured values to the organic matter concentration of the predetermined inflow raw water. An automatic control device for the amount of raw water flowing into an activated sludge treatment facility, characterized in that the amount of raw water flowing into an activated sludge treatment facility is calculated, the amount of raw water flowing in is calculated based on the calculated amount, and the amount of raw water flowing into the activated sludge treatment facility is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3138290A JPH04338292A (en) | 1991-05-14 | 1991-05-14 | Automatic controller for inflow rate of raw water to activated sludge treating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3138290A JPH04338292A (en) | 1991-05-14 | 1991-05-14 | Automatic controller for inflow rate of raw water to activated sludge treating equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04338292A true JPH04338292A (en) | 1992-11-25 |
Family
ID=15218438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3138290A Pending JPH04338292A (en) | 1991-05-14 | 1991-05-14 | Automatic controller for inflow rate of raw water to activated sludge treating equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04338292A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51120056A (en) * | 1975-04-14 | 1976-10-21 | Fujisawa Pharmaceut Co Ltd | System for treating waste liquid by active mud method |
| JPS565190A (en) * | 1979-06-26 | 1981-01-20 | Tatsuo Oki | Microorganism concentration controller for activated sludge in aeration tank |
-
1991
- 1991-05-14 JP JP3138290A patent/JPH04338292A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51120056A (en) * | 1975-04-14 | 1976-10-21 | Fujisawa Pharmaceut Co Ltd | System for treating waste liquid by active mud method |
| JPS565190A (en) * | 1979-06-26 | 1981-01-20 | Tatsuo Oki | Microorganism concentration controller for activated sludge in aeration tank |
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