JPH0476759B2 - - Google Patents
Info
- Publication number
- JPH0476759B2 JPH0476759B2 JP58243767A JP24376783A JPH0476759B2 JP H0476759 B2 JPH0476759 B2 JP H0476759B2 JP 58243767 A JP58243767 A JP 58243767A JP 24376783 A JP24376783 A JP 24376783A JP H0476759 B2 JPH0476759 B2 JP H0476759B2
- Authority
- JP
- Japan
- Prior art keywords
- amount
- hydrogen donor
- load
- calculate
- denitrification
- 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
- 239000000852 hydrogen donor Substances 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 16
- 239000002351 wastewater Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- 230000001546 nitrifying effect Effects 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 238000002347 injection Methods 0.000 description 18
- 239000007924 injection Substances 0.000 description 18
- 239000010865 sewage Substances 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000033116 oxidation-reduction process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- -1 nitrate ions Chemical class 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は下水の処理における硝化−脱窒工程
で、脱窒槽内に水素供与体（例えばメタノール、
酢酸、グルコーズなど）を注入する量を制御する
方法に関するものである。Detailed Description of the Invention [Field of Application of the Invention] The present invention is a nitrification-denitrification process in sewage treatment, in which a hydrogen donor (for example, methanol,
This relates to a method for controlling the amount of injected substances (acetic acid, glucose, etc.).
下水処理において、下水中のアンモニア性窒素
を生物学的に硝化し、これを脱窒して浄化する方
法が盛んに行なわれるようになつた。
In sewage treatment, methods of biologically nitrifying ammonia nitrogen in sewage and purifying it by denitrification have become popular.
第１図は従来用いられている下水処理装置の系
統図で、流入してくる汚水Ａは硝化槽７に注入さ
れ、曝気装置８により気泡を注入されつつ好気性
微生物によつて硝化される。即ち、汚水中のアン
モニア性窒素が
NH4＋2O2→NO3 -＋H2Ｏ＋2H+ ……(1)
上記の(1)式により硝化されて硝酸イオンNO3 -
となる。この反応はPH７〜９が最適であるため、
PH計12によつてPHを測定し、演算器１３で注入ポ
ンプ１４を駆動制御して適量のアルカリ剤Ｇを供
給している。 FIG. 1 is a system diagram of a conventional sewage treatment system. Incoming wastewater A is injected into a nitrification tank 7, and is nitrified by aerobic microorganisms while being injected with air bubbles by an aeration device 8. That is, ammonia nitrogen in wastewater is nitrified according to the above equation (1) as NH 4 +2O 2 →NO 3 - +H 2 O+2H + ...(1) to form nitrate ions NO 3 -
becomes. This reaction is optimal at pH 7-9, so
The PH is measured by a PH meter 12, and the injection pump 14 is driven and controlled by a computing unit 13 to supply an appropriate amount of alkaline agent G.
硝化された汚水は返送汚水矢印Ｂとして脱窒槽
６に注入され、注入ポンプ５により水素供与体Ｆ
を注加され、攪拌フアン１１で攪拌されて、
2NO3 -＋5H2→N2＋2OH-＋4H2Ｏ ……(2)
上記(2)式により硝酸イオンNO3 -が無害のガス
となる。 The nitrified sewage is injected into the denitrification tank 6 as return sewage arrow B, and is transferred to the hydrogen donor F by the injection pump 5.
is added and stirred by the stirring fan 11 to form 2NO 3 − +5H 2 →N 2 +2OH − +4H 2 O (2) According to the above equation (2), nitrate ion NO 3 − becomes a harmless gas.
上記のように、脱窒槽６、硝化槽７を循環しつ
つ浄化された汚水は終沈９を経て放流水Ｃとして
放流される。矢印Ｄは余剰汚泥を示しており、廃
棄もしくは利用（埋立など）される。矢印Ｅは返
送汚泥を示し、硝化用の微生物など有用物を含ん
だ泥水が返送再利用される。 As described above, the wastewater that has been purified while circulating through the denitrification tank 6 and the nitrification tank 7 is discharged as effluent water C through the final settling 9. Arrow D indicates surplus sludge, which is disposed of or used (landfill, etc.). Arrow E indicates returned sludge, and muddy water containing useful substances such as microorganisms for nitrification is returned and reused.
前記の水素供与体Ｆの注入量は、脱窒すべき硝
酸イオンNO3 -、及び亜硝酸イオンNO2 -に含ま
れている窒素分の量（以下、NO3 -，NO2 -−Ｎ
負荷と呼び、NO3 -，NO2 -負荷と略称する）に
応じて適正量であることを要する。 The injection amount of the hydrogen donor F is determined by the amount of nitrogen contained in the nitrate ions NO 3 - and nitrite ions NO 2 - to be denitrified (hereinafter referred to as NO 3 - , NO 2 - -N
It is necessary to have an appropriate amount according to the load (abbreviated as NO 3 - , NO 2 - load).
水素供与体が不足であれば脱窒反応式(2)が進行
せず、過多であれば水素供与体を浪費して不経済
である上に、該水素供与体によつて水質を悪化さ
せる。 If there is not enough hydrogen donor, the denitrification reaction formula (2) will not proceed, and if there is too much hydrogen donor, the hydrogen donor will be wasted, which is uneconomical, and the water quality will deteriorate due to the hydrogen donor.
ところが、従来技術においては、NO3 -，NO2
−の濃度を高精度で即座に測定することができな
いため、第１図に示すように脱窒槽６内に酸化還
元電位計３を設けてその検出出力信号を演算器４
に入力せしめ、この酸化還元電位が最適値となる
ように水素供与体Ｆの注入ポンプ５を駆動制御し
ている。 However, in the conventional technology, NO 3 - , NO 2
- Since it is not possible to immediately measure the concentration of
is input, and the injection pump 5 for the hydrogen donor F is drive-controlled so that this redox potential becomes the optimum value.
しかし、上に述べたような従来の水素供与体注
入量制御方法では次に述べるような技術的問題が
有る。 However, the conventional hydrogen donor injection amount control method as described above has the following technical problems.
第２図は、浄化処理すべき下水の流量と、該下
水中の窒素濃度との日変動パターンの１例を示す
図表である。上記第２図に基づいて、下水中のア
ンモニア性窒素濃度（以下、NH3−Ｎ負荷と略
称する）と流入量との関係を図表化すると第３図
の如くになる。 FIG. 2 is a chart showing an example of a daily variation pattern between the flow rate of sewage to be purified and the nitrogen concentration in the sewage. Based on the above-mentioned Fig. 2, the relationship between the ammonia nitrogen concentration in sewage (hereinafter abbreviated as NH 3 -N load) and the inflow amount is graphed as shown in Fig. 3.
上記のようにNH3−Ｎ負荷が変化するので、
これに応じて適正な脱窒処理を行なわねばならな
いのであるが、更に上記のNH3−Ｎ負荷が硝化
作用によつてNO3 -，NO2 -負荷に変換される場
合、温度の高低によつて硝化率が変化するという
問題が有る。 As the NH 3 −N load changes as described above,
Appropriate denitrification treatment must be carried out accordingly, but when the above NH 3 -N load is converted into NO 3 - and NO 2 - loads through nitrification, the denitrification process will change depending on the temperature. However, there is a problem in that the nitrification rate changes.
第４図はNH3−Ｎ負荷と硝化率との関係を、
ｔ＞15℃、10℃＜ｔ＜15℃、ｔ＜10℃の三つの場
合に区分して示した図表である。また、第５図は
NH3−Ｎ負荷とNO3 -，NO2 -負荷との関係をｔ
＝15℃、ｔ＝7.5℃、Ｔ＝０℃の三つの場合に区
分して示した図表である。 Figure 4 shows the relationship between NH 3 -N load and nitrification rate.
This is a chart showing three cases: t>15°C, 10°C<t<15°C, and t<10°C. Also, Figure 5 shows
The relationship between NH 3 −N load and NO 3 − , NO 2 − load is expressed as t
This is a chart showing three cases: T = 15°C, T = 7.5°C, and T = 0°C.
こうした問題が有るため、従来のように酸化還
元電位を測定するだけで温度のフアクターを無視
した制御方法では水素供与体の注入量の過、不足
を生じ、浄化不足、若しくは水素供与体浪費とい
つた不具合を招く。 Due to these problems, the conventional control method that only measures the redox potential and ignores the temperature factor may result in over- or under-injection of hydrogen donor, resulting in insufficient purification or waste of hydrogen donor. This may cause problems.
第５図から理解できるように、ｔ＞15℃の場合
は、NO3 -，NO2 -負荷がNH3−Ｎ負荷に比例す
るものと考えて水素供与体の注入を行えばよい
が、低温領域においては硝化の進行が遅いので水
素供与体の過剰注入を生じ易い。 As can be understood from Fig. 5, when t > 15°C, hydrogen donor injection can be performed assuming that NO 3 - and NO 2 - loads are proportional to NH 3 -N loads; Since nitrification progresses slowly in this region, excessive injection of hydrogen donor is likely to occur.
本発明は上述の事情に鑑みて為され、全温度域
において、特に15℃未満の低温域において適正量
の注入を行ない得る、水素供与体の注入量制御方
法を提供しようとするものである。
The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a method for controlling the injection amount of a hydrogen donor, which allows injection of an appropriate amount in the entire temperature range, particularly in the low temperature range below 15°C.
上記の目的を達成するため、本発明の制御方法
は、汚水中のアンモニアを硝化し、脱窒して浄化
する工程の内の脱窒工程において、水温と、酸化
還元電位と、汚水流入量とを測定し、上記酸化還
元電位の測定値に基づいて水素供与体の必要量を
算出し、
前記汚水流入量に基づいてNH3−Ｎ負荷量を
算出し、
上記NH3−Ｎ負荷量の算出値、および前記水
温の測定値に基づいてNO3 -，NO2 -負荷量を算
出し、
上記NO3 -，NO2 -負荷量の算出値に基づいて
前記水素供与体の必要量の補正量を算出して、水
素供与体の適正量を算出し、
前記脱窒工程における水素供与体の添加量を上
記水素供与体の適正量ならしめるように制御する
ことを特徴とする。
In order to achieve the above object, the control method of the present invention is designed to control water temperature, oxidation-reduction potential, and wastewater inflow rate in the denitrification process of the process of nitrifying ammonia in wastewater and denitrifying it to purify it. , calculate the required amount of hydrogen donor based on the measured value of the oxidation-reduction potential, calculate the NH 3 -N load amount based on the sewage inflow amount, and calculate the NH 3 -N load amount above. and the measured value of the water temperature to calculate the NO 3 - and NO 2 - loading amounts, and based on the calculated values of the NO 3 - and NO 2 - loading amounts, correct the required amount of the hydrogen donor. An appropriate amount of the hydrogen donor is calculated by calculating the amount of the hydrogen donor, and the amount of the hydrogen donor added in the denitrification step is controlled to be the appropriate amount of the hydrogen donor.
次に、本発明の１実施例について、第６図を参
照しつつ説明する。
Next, one embodiment of the present invention will be described with reference to FIG.
第６図は、本発明の制御方法を実施するために
第１図の従来装置を改良した１例を示し、第１図
と異なるところは次記の３点である。 FIG. 6 shows an example in which the conventional device shown in FIG. 1 is improved in order to carry out the control method of the present invention, and is different from FIG. 1 in the following three points.
(1) 汚水の流入路矢印Ａに流量計１を設けたこ
と。(1) Flowmeter 1 was installed at the wastewater inflow path arrow A.
(2) 脱窒槽６内に温度計２を設けたこと。(2) A thermometer 2 was installed inside the denitrification tank 6.
(3) 酸化還元電位計３の検出信号を入力されて水
素供与体注入ポンプ５を駆動制御する演算器４
を次に詳述する演算器４′のごとく改良し、酸
化還元電位計３と、流量計１と、温度計２と、
それぞれの検出信号出力を入力されて演算を行
なうように構成したこと。(3) A computing unit 4 that receives the detection signal of the redox potentiometer 3 and controls the operation of the hydrogen donor injection pump 5.
is improved as shown in the computing unit 4' which will be detailed next, and includes an oxidation-reduction potentiometer 3, a flowmeter 1, a thermometer 2,
The configuration is such that the respective detection signal outputs are input and calculations are performed.
上記の改良形演算器４′は、図示のごとく、流
量−NH3−Ｎ負荷予測回路１５と、温度−NO2
−，NO3 -−Ｎ予測回路１６と、水素供与体注入
量補正回路１７と、擬似水素供与体設定回路１８
とからなる。 As shown in the figure, the above-mentioned improved computing unit 4' includes a flow rate -NH 3 -N load prediction circuit 15 and a temperature -NO 2
- , NO 3 - -N prediction circuit 16, hydrogen donor injection amount correction circuit 17, and pseudo hydrogen donor setting circuit 18
It consists of
上記の流量−NH3−Ｎ負荷予測回路１５には、
第３図に示したような流量に対するNH3−Ｎ負
荷のデータを記憶させておき、流量計１から流量
信号を入力されてNH3−Ｎ負荷を算出せしめ、
これを次段の温度−NO2 -，NO3 -−Ｎ予測回路
１６に入力せしめる。 The above flow rate-NH 3 -N load prediction circuit 15 includes:
The data of the NH 3 -N load with respect to the flow rate as shown in FIG. 3 is stored, and the flow rate signal is inputted from the flow meter 1 to calculate the NH 3 -N load.
This is input to the temperature -NO 2 - , NO 3 - -N prediction circuit 16 at the next stage.
温度−NO2 -，NO3 -−Ｎ予測回路１６には、
第５図に示したような各温度におけるNH3−Ｎ
負荷とNO2 -，NO3 -−Ｎ負荷のデータを記憶さ
せておき、温度計２の信号出力と、負荷予測回路
１５から入力されたNH3−Ｎ負荷信号とに基づ
いてNO2 -，NO3 -−Ｎ負荷を算出せしめ、これ
を水素供与体注入量補正回路１７に入力せしめ
る。 The temperature -NO 2 - , NO 3 - -N prediction circuit 16 includes:
NH 3 −N at each temperature as shown in Figure 5
The data of the load and the NO 2 - , NO 3 - -N load are stored, and NO 2 -, NO 2 -, NO 2 - , based on the signal output of the thermometer 2 and the NH 3 -N load signal input from the load prediction circuit 15 are stored. The NO 3 - -N load is calculated and input into the hydrogen donor injection amount correction circuit 17.
一方、擬似水素供与体設定回路１８は、酸化還
元電位計３の出力信号に基づいて、温度要素を加
味していない仮の水素供与体必要量を算出させ、
これを前記の補正回路１７に入力せしめる。 On the other hand, the pseudo hydrogen donor setting circuit 18 calculates a provisional required amount of hydrogen donor that does not take into account the temperature factor, based on the output signal of the redox electrometer 3,
This is input to the correction circuit 17 mentioned above.
補正回路１７は、この仮の水素供与体必要量に
対し、NO2 -，NO3 -−Ｎ負荷信号に基づく補正
を加え、補正計算結果により注入ポンプ５を駆動
制御して水素供与体Ｆの流量制御を行なう。 The correction circuit 17 applies a correction based on the NO 2 − , NO 3 − −N load signal to this provisional required amount of hydrogen donor, and drives and controls the injection pump 5 based on the correction calculation result to adjust the amount of hydrogen donor F. Perform flow control.
以上のようにして、汚水流入量と、水温と、酸
化還元電位との三つのデータに基づく水素供与体
注入量制御を行なうと、具体的に次のような作
用、効果が得られる。第５図より、温度15℃以上
では、NO2 -，NO3 -−Ｎ負荷は、NH3−Ｎ負荷
つまり流入量と比例関係にあるのだから、酸化還
元電位と、流入量だけにて、水素供与体注入量
は、決定しているが、温度が低い場合（15℃以下
の場合）には、第５図に表わされた如く、比例関
係を失う。これは、硝化反応(1)式が100％行なわ
れず、NH3−Ｎがそのまま、脱窒槽６に送り込
まれるものがあるからである。よつて、温度によ
る補正が行なわれなければならず、NH3−Ｎ負
荷と温度によつてNO2 -，NO3 -負荷量を決定す
るように構成した温度−NO2 -，NO3 -−Ｎ予測
回路１６の機能が生きてきて、低温域においても
循環汚水中のNO2 -，NO3 -濃度が正確に把握で
き、これに基づいて水素供与体の適正注入量が算
出される。 When the amount of hydrogen donor injection is controlled based on the three data of the inflow of wastewater, water temperature, and redox potential in the manner described above, the following specific actions and effects can be obtained. From Figure 5, at temperatures above 15°C, the NO 2 - , NO 3 - -N loads are in a proportional relationship with the NH 3 -N load, that is, the inflow amount, so only the oxidation-reduction potential and inflow amount, Although the amount of hydrogen donor injection is determined, when the temperature is low (below 15° C.), the proportional relationship is lost as shown in FIG. This is because in some cases, the nitrification reaction (1) is not carried out 100%, and NH 3 --N is directly sent to the denitrification tank 6. Therefore , temperature - based correction must be performed , and the temperature- NO 2 - , NO 3 - The function of the N prediction circuit 16 is activated, and the NO 2 - and NO 3 - concentrations in the circulating wastewater can be accurately grasped even in the low temperature range, and the appropriate injection amount of the hydrogen donor can be calculated based on this.
以上詳述したように、本発明の水素供与体注入
量制御方法は、汚水中のアンモニアを硝化し、脱
窒して浄化する工程の内の脱窒工程において、水
温と、酸化還元電位と、汚水流入量とを測定し、
上記酸化還元電位の測定値に基づいて水素供与体
の必要量を算出し、
前記汚水流入量に基づいてNH3−Ｎ負荷量を
算出し、
上記NH3−Ｎ負荷量の算出値、および前記水
温の測定値に基づいてNO3 -，NO2 -負荷量を算
出し、
上記NO3 -，NO2 -負荷量の算出値に基づいて
前記水素供与体の必要量の補正量を算出して、水
素供与体の適正量を算出し、
前記脱窒工程における水素供与体の添加量を上
記水素供与体の適正量ならしめるように制御する
ことにより、全温度領域において、特に15℃未満
の低温域において適正量の水素供与体を注入する
ことができるという優れた実用的効果を奏し、汚
水処理装置における放流水の水質保証、及び該装
置の経済性向上に貢献するところ多大である。
As described above in detail, the method for controlling the amount of hydrogen donor injection of the present invention is performed by controlling the water temperature, the redox potential, and Measure the amount of sewage inflow,
Calculate the required amount of hydrogen donor based on the measured value of the oxidation-reduction potential, calculate the NH 3 -N load amount based on the sewage inflow amount, calculate the calculated value of the NH 3 -N load amount, and the Calculate the NO 3 - , NO 2 - loading amount based on the measured value of water temperature, and calculate the correction amount for the required amount of the hydrogen donor based on the calculated value of the NO 3 - , NO 2 - loading amount. By calculating the appropriate amount of the hydrogen donor and controlling the amount of the hydrogen donor added in the denitrification step to be the appropriate amount of the hydrogen donor, in the entire temperature range, especially at low temperatures below 15 ° C. It has an excellent practical effect of being able to inject an appropriate amount of hydrogen donor in the area, and greatly contributes to guaranteeing the quality of effluent water in sewage treatment equipment and improving the economic efficiency of the equipment.
第１図は従来の制御装置を備えた汚水処理装置
の１例の系統図である。第２図は下水の窒素濃度
及び流量の時間的変化を示す図表、第３図は流量
とNH3−Ｎ負荷との関係を示す図表、第４図及
び第５図はそれぞれ温度の影響を示す図表、第６
図は本発明の脱窒槽の水素供与体流入制御方法を
実施するために構成した制御装置の系統図であ
る。
１……流量計、２……温度計、３……酸化還元
電位計、４，４′……演算器、５……注入ポンプ、
６……脱窒槽、７……硝化槽、８……曝気装置、
９……終沈、１０……攪拌モータ、１１……攪拌
用フアン、１２……PH計、１３……演算器、１４
……注入ポンプ。
FIG. 1 is a system diagram of an example of a sewage treatment apparatus equipped with a conventional control device. Figure 2 is a chart showing temporal changes in sewage nitrogen concentration and flow rate, Figure 3 is a chart showing the relationship between flow rate and NH 3 -N load, and Figures 4 and 5 each show the influence of temperature. Diagram, 6th
The figure is a system diagram of a control device configured to carry out the method for controlling the inflow of hydrogen donors into a denitrification tank according to the present invention. 1... Flow meter, 2... Thermometer, 3... Redox potential meter, 4, 4'... Arithmetic unit, 5... Infusion pump,
6... denitrification tank, 7... nitrification tank, 8... aeration device,
9... Final settling, 10... Stirring motor, 11... Stirring fan, 12... PH meter, 13... Arithmetic unit, 14
...Infusion pump.
Claims (1)
する工程の内の脱窒工程において、水温と、酸化
還元電位と、汚水流入量とを測定し、 上記酸化還元電位の測定値に基づいて水素供与
体の必要量を算出し、 前記汚水流入量に基づいてNH3−Ｎ負荷量を
算出し、 上記NH3−Ｎ負荷量の算出値、および前記水
温の測定値に基づいてNO3 -，NO2 -負荷量を算
出し、 上記NO3 -，NO2 -負荷量の算出値に基づいて
前記水素供与体の必要量の補正量を算出して、水
素供与体の適正量を算出し、 前記脱窒工程における水素供与体の添加量を上
記水素供与体の適正量ならしめるように制御する
ことを特徴とする、脱窒槽の水素供与体注入量制
御方法。[Scope of Claims] 1. In the denitrification process of the process of nitrifying ammonia in wastewater and denitrifying it to purify it, the water temperature, redox potential, and amount of wastewater inflow are measured, and the said redox potential is measured. Calculate the required amount of hydrogen donor based on the measured value of , calculate the NH 3 -N load amount based on the amount of wastewater inflow, and calculate the calculated value of the NH 3 -N load amount and the measured value of the water temperature. The amount of NO 3 - , NO 2 - loaded is calculated based on the amount of NO 3 - , NO 2 - loaded, and the amount of correction for the required amount of the hydrogen donor is calculated based on the calculated value of the amount of NO 3 -, NO 2 - loaded. A method for controlling the amount of hydrogen donor injected into a denitrification tank, comprising: calculating an appropriate amount of the hydrogen donor, and controlling the amount of the hydrogen donor added in the denitrification step to be the appropriate amount of the hydrogen donor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24376783A JPS60137494A (en) | 1983-12-26 | 1983-12-26 | Method for controlling amount of hydrogen donor to be injected into denitrification vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24376783A JPS60137494A (en) | 1983-12-26 | 1983-12-26 | Method for controlling amount of hydrogen donor to be injected into denitrification vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60137494A JPS60137494A (en) | 1985-07-22 |
| JPH0476759B2 true JPH0476759B2 (en) | 1992-12-04 |
Family
ID=17108670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24376783A Granted JPS60137494A (en) | 1983-12-26 | 1983-12-26 | Method for controlling amount of hydrogen donor to be injected into denitrification vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60137494A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6129104A (en) * | 1998-12-23 | 2000-10-10 | Tetra Process Technologies A Severn Trent Services Company | Method for automotive dose control of liquid treatment chemicals |
| JP4768886B1 (en) * | 2011-03-02 | 2011-09-07 | 株式会社加藤建設 | How to remove nitrogen in water |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5222916A (en) * | 1975-08-11 | 1977-02-21 | American Bank Note Co | Identification card such as identification certificate or the like and card sheet and method of producing same |
| JPS558852A (en) * | 1978-07-04 | 1980-01-22 | Ebara Infilco Co Ltd | Controlling organic carbon source injection ratio in biological denitrification |
-
1983
- 1983-12-26 JP JP24376783A patent/JPS60137494A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5222916A (en) * | 1975-08-11 | 1977-02-21 | American Bank Note Co | Identification card such as identification certificate or the like and card sheet and method of producing same |
| JPS558852A (en) * | 1978-07-04 | 1980-01-22 | Ebara Infilco Co Ltd | Controlling organic carbon source injection ratio in biological denitrification |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60137494A (en) | 1985-07-22 |
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