JP2005274170A - Respiration speed measuring method for calculating concentration of organic matter in organic wastewater and respiration speed measuring instrument therefor - Google Patents

Respiration speed measuring method for calculating concentration of organic matter in organic wastewater and respiration speed measuring instrument therefor Download PDF

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JP2005274170A
JP2005274170A JP2004083813A JP2004083813A JP2005274170A JP 2005274170 A JP2005274170 A JP 2005274170A JP 2004083813 A JP2004083813 A JP 2004083813A JP 2004083813 A JP2004083813 A JP 2004083813A JP 2005274170 A JP2005274170 A JP 2005274170A
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dissolved oxygen
concentration
organic
activated sludge
measured
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Tatsuya Deguchi
達也 出口
Keitaro Tada
啓太郎 多田
Nobukazu Kobata
信和 木幡
Masao Ayukawa
正雄 鮎川
Hiroshi Sakuma
博司 佐久間
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Ebara Corp
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    • 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
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a respiration speed measuring method for calculating the concentration of organic matter capable of being measured simply in a short time without supplying dissolved oxygen due to an oxygen containing gas during measurement. <P>SOLUTION: In the respiration speed measuring method for calculating a respiration speed on the bases of the lowering of dissolved oxygen due to activated sludge of a liquid to be measured containing organic wastewater in aerated to calculate the concentration of easily biodecomposable organic matter and the concentration of delay biodecomposable organic matter, organic wastewater, an activated sludge mixed liquid and dilution water are used in a mixed ratio that the concentration of CODcr concentration originating from the organic wastewater is 7-100 mg/L, the concentration of activated sludge (MLSS) is 300-1,200 mg/L and initial dissolved oxygen is 6-8 mg/L. Dissolved oxygen is measured until dissolved oxygen becomes Omg/L from the start of measurement and a chemical agent for suppressing the action of nitrating bacteria can be added to the liquid to be measured in the case of the presence of ammoniacal nitrogen. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、生物学的な処理の被処理水の易生物分解性有機物や遅生物分解性有機物の濃度を求めるための呼吸速度測定方法と装置に関する。   The present invention relates to a respiration rate measuring method and apparatus for determining the concentration of readily biodegradable organic substances and slow biodegradable organic substances in biologically treated water.

活性汚泥モデル（ＡＳＭ）では、生物処理反応を数学的に表現するために、有機性排水中の有機成分を分類している。その中で、活性汚泥混合液中に存在する微生物に速やかに分解される成分を易生物分解性有機物、ゆっくり分解される有機成分を遅生物分解性有機物とし、その他、生物分解されない有機物を非生物分解性有機物としている。それらのうち、易生物分解性有機物は、有機性排水と活性汚泥混合液を混合して、その呼吸速度の変化から求める。呼吸速度は、被測定液の溶存酸素の変化を測定することで、例えば、図１のような曲線として得られる。すなわち、易生物分解性有機物が分解される測定初期に呼吸速度は高く、その後、急に低下した後、ゆっくりと低下していく。   In the activated sludge model (ASM), organic components in organic wastewater are classified in order to mathematically express biological treatment reactions. Among them, the components that are rapidly decomposed by microorganisms present in the activated sludge mixed solution are easily biodegradable organic materials, the slowly decomposed organic components are slow biodegradable organic materials, and the other organic materials that are not biodegradable are non-living. Degradable organic substances. Among them, the readily biodegradable organic matter is obtained from the change in the respiration rate by mixing the organic waste water and the activated sludge mixed solution. The respiration rate is obtained, for example, as a curve as shown in FIG. 1 by measuring the change in dissolved oxygen in the liquid to be measured. That is, the respiration rate is high at the beginning of the measurement when the readily biodegradable organic substance is decomposed, and then rapidly decreases and then slowly decreases.

ゆっくりと低下する部分を直線で近似し、その近似した直線と呼吸速度で囲まれた部分（図１の斜線部）の面積から易生物分解性有機物を求める。遅生物分解性有機物は、この呼吸速度曲線を再現するように、ＡＳＭを用いてシミュレーションすることで求める。このための呼吸速度測定方法は、有機性排水と活性汚泥混合液を１０：１程度の割合で混合した被測定液の呼吸速度を測定する方法が主流であった（第４０回下水道研究発表会、下水道事業団、「活性汚泥モデルでの利用を想定した下水処理場流入水有機成分の分画」）。従来の方法では、被測定液中の有機性排水由来のＣＯＤｃｒ濃度が、混合前の有機性排水の９０％以上であるため、被測定液中の易生物分解性有機物濃度も高い。このため、被測定液中に存在する初期溶存酸素だけでは測定を完了することができず、溶存酸素が低下するたびに、酸素含有気体を曝気し、溶存酸素を供給する必要があるため多くの手間がかかる。また、酸素含有気体を曝気する操作を自動化することも考えられるが、呼吸速度測定中に溶存酸素を供給できるような装置を設置し、溶存酸素に応じて溶存酸素供給装置の電源をＯＮ／ＯＦＦする制御装置を設置する必要あり、呼吸速度測定装置の製作コストがかかる。
特開平９−１３５６７９号公報 The slowly decreasing portion is approximated by a straight line, and the readily biodegradable organic matter is obtained from the area of the portion surrounded by the approximated straight line and the respiration rate (shaded portion in FIG. 1). Slow biodegradable organic substances are obtained by simulation using ASM so as to reproduce this respiration rate curve. The main method of measuring the respiratory rate for this purpose is to measure the respiratory rate of the liquid to be measured, which is a mixture of organic waste water and activated sludge mixed liquid at a ratio of about 10: 1 (The 40th Sewerage Research Conference). , Sewerage Agency, “Fractionation of organic components in sewage treatment plants assuming use with activated sludge model”). In the conventional method, the concentration of CODcr derived from organic wastewater in the liquid to be measured is 90% or more of the organic wastewater before mixing, and thus the concentration of readily biodegradable organic matter in the liquid to be measured is high. For this reason, the measurement cannot be completed only with the initial dissolved oxygen present in the liquid to be measured, and it is necessary to aerate the oxygen-containing gas and supply the dissolved oxygen each time the dissolved oxygen decreases. It takes time and effort. It is also possible to automate the operation of aeration of oxygen-containing gas, but a device that can supply dissolved oxygen during breathing rate measurement is installed, and the power supply of the dissolved oxygen supply device is turned ON / OFF according to the dissolved oxygen. It is necessary to install a control device that performs the manufacturing cost of the respiratory rate measuring device.
JP-A-9-135679

従来の方法では、従来の被測定液中の有機性排水由来のＣＯＤｃｒ濃度が高いため、すべての易生物分解性有機物を分解するまでに時間がかかり、また、呼吸速度測定中に酸素含有気体を曝気することによる溶存酸素の供給を行う必要があった。
そこで、本発明は、上記従来技術の問題点を解消し、呼吸速度の測定中に酸素含有気体の曝気による溶存酸素の供給を行うことなく、短時間で簡単に呼吸速度の測定を行うことができる生物分解性有機物濃度を求めるための呼吸速度測定方法と装置を提供することを課題とする。 In the conventional method, since the concentration of CODcr derived from organic wastewater in the conventional liquid to be measured is high, it takes time to decompose all readily biodegradable organic substances, and oxygen-containing gas is measured during respiration rate measurement. It was necessary to supply dissolved oxygen by aeration.
Therefore, the present invention solves the above-mentioned problems of the prior art, and can easily measure the respiratory rate in a short time without supplying dissolved oxygen by aeration of the oxygen-containing gas during the measurement of the respiratory rate. It is an object of the present invention to provide a respiration rate measurement method and apparatus for determining a biodegradable organic substance concentration that can be produced.

上記課題を解決するために、本発明では、有機性排水中の易生物分解性有機物濃度及び遅生物分解性有機物濃度を求めるための、前記有機性排水を含む被測定液の活性汚泥による溶存酸素の低下により呼吸速度を算出する呼吸速度測定方法において、前記被測定液として、前記有機性排水、活性汚泥混合液及び希釈水の混合割合を調整して用いることを特徴とする呼吸速度測定方法としたものである。
また、本発明では、有機性排水中の易生物分解性有機物濃度及び遅生物分解性有機物濃度を求めるための、前記有機性排水を含む被測定液の活性汚泥による溶存酸素の低下により、呼吸速度を算出する呼吸速度測定方法において、前記被測定液として、前記有機性排水由来のＣＯＤｃｒ濃度が７〜１００ｍｇ／Ｌ、活性汚泥濃度（ＭＬＳＳ）が３００〜１２００ｍｇ／Ｌ及び初期溶存酸素が６〜８ｍｇ／Ｌになるように、前記有機性排水、活性汚泥混合液及び希釈水の混合割合を調整して用いることを特徴とする呼吸速度測定方法としたものである。
前記測定方法において、溶存酸素の測定は、測定開始から溶存酸素が０ｍｇ／Ｌになるまで行い、前記被測定液には、アンモニア性窒素が存在する場合に硝化菌の働きを抑制する薬剤を添加することができる。
さらに、本発明では、有機性排水中の易生物分解性有機物濃度及び遅生物分解性有機物濃度を求めるための、前記有機性排水を含む被測定液の活性汚泥による溶存酸素の低下を測定する装置と、該測定値により呼吸速度を算出する算出手段とを有する呼吸速度測定装置において、前記被測定液として、前記有機性排水、活性汚泥混合液及び希釈水の混合割合を調整して用いることを特徴とする呼吸速度測定装置としたものである。 In order to solve the above-mentioned problems, in the present invention, dissolved oxygen due to activated sludge of the liquid to be measured containing the organic waste water for obtaining the readily biodegradable organic substance concentration and the slow biodegradable organic substance concentration in the organic waste water. In the respiration rate measurement method for calculating the respiration rate by lowering the respiration rate, the respiration rate measurement method, wherein the organic wastewater, the activated sludge mixed solution and the dilution water are mixed and used as the measured liquid, and It is a thing.
Further, in the present invention, the respiration rate is reduced by the decrease in dissolved oxygen due to the activated sludge of the liquid to be measured containing the organic waste water for obtaining the readily biodegradable organic substance concentration and the slow biodegradable organic substance concentration in the organic waste water. In the respiration rate measuring method for calculating the above, as the liquid to be measured, the CODcr concentration derived from the organic waste water is 7 to 100 mg / L, the activated sludge concentration (MLSS) is 300 to 1200 mg / L, and the initial dissolved oxygen is 6 to 8 mg. The respiration rate measurement method is characterized in that the mixing ratio of the organic waste water, the activated sludge mixed solution and the diluted water is adjusted so as to be / L.
In the measurement method, dissolved oxygen is measured until the dissolved oxygen reaches 0 mg / L from the start of measurement, and a chemical that suppresses the action of nitrifying bacteria is added to the solution to be measured when ammoniacal nitrogen is present. can do.
Furthermore, in this invention, the apparatus which measures the fall of the dissolved oxygen by the activated sludge of the to-be-measured liquid containing the said organic waste_water | drain for calculating | requiring the easily biodegradable organic substance density | concentration and slow biodegradable organic substance density | concentration in organic waste_water | drain And a respiration rate measuring device having a calculating means for calculating a respiration rate based on the measured value, and adjusting and using a mixing ratio of the organic waste water, the activated sludge mixed solution and the diluted water as the measured liquid. This is a characteristic respiratory rate measuring device.

本発明によると、反応容器内に有機性排水と返送汚泥混合液と希釈水をＭＬＳＳ３００〜１２００ｍｇ／Ｌ、好ましくは、３００〜８００ｍｇ／Ｌ、生物学的処理の被処理水の全ＣＯＤｃｒを希釈により７〜１００ｍｇ／Ｌ、好ましくは、７〜７０ｍｇ／Ｌに調整して、呼吸速度測定を行うことにより、易生物分解性有機物濃度を求めるための呼吸速度測定にかかる時間を短縮し、効率的な測定を行うことができる。また、測定中に酸素供給する必要がないため、特別な装置を必要とせず、手間を軽減できる。   According to the present invention, the organic waste water, the return sludge mixed liquid and the dilution water are MLSS 300 to 1200 mg / L, preferably 300 to 800 mg / L, and the total CODcr of the biological treatment water is diluted in the reaction vessel. By adjusting the respiration rate to 7 to 100 mg / L, preferably 7 to 70 mg / L, the time required for respiration rate measurement for obtaining the readily biodegradable organic substance concentration can be shortened and efficient. Measurements can be made. In addition, since it is not necessary to supply oxygen during the measurement, a special device is not required, and labor can be reduced.

以下、本発明の実施形態について説明する。易生物分解性有機物を測定するための呼吸速度測定において、呼吸速度曲線を得るためには、有機性排水と活性汚泥混合液を混合して、活性汚泥混合液中に存在する微生物の働きによる溶存酸素の低下挙動を、溶存酸素測定装置を用いて測定する。活性汚泥混合液の中に硝化菌が存在し、有機性排水中のアンモニア性窒素が存在する場合には、アンモニア性窒素が硝化されて硝酸性窒素になる際に溶存酸素を消費するため、アリルチオ尿素（ＡＴＵ）等の硝化菌の働きを抑制する薬剤を添加した上で測定を行う。ここで用いる活性汚泥混合液は、対象有機性排水を処理している施設のもの、もしくは類似の排水を処理している他の施設のもの、もしくは対象有機性排水で馴養したものを用いる。   Hereinafter, embodiments of the present invention will be described. In measuring respiration rate for measuring biodegradable organic matter, in order to obtain a respiration rate curve, organic waste water and activated sludge mixed solution are mixed and dissolved by the action of microorganisms present in the activated sludge mixed solution. The decreasing behavior of oxygen is measured using a dissolved oxygen measuring device. If nitrifying bacteria are present in the activated sludge mixture and ammonia nitrogen is present in the organic waste water, allylthio is consumed because ammonia nitrogen is nitrified to nitrate nitrogen. Measurement is performed after adding a drug that suppresses the action of nitrifying bacteria such as urea (ATU). The activated sludge mixed liquid used here is from a facility treating the target organic wastewater, from another facility treating similar wastewater, or from the facility adapted to the target organic wastewater.

図２に、本発明で用いる呼吸速度測定装置の一例を示す。本装置は、撹拌装置１、反応容器２、溶存酸素センサー３、溶存酸素測定装置４、データ記録装置５からなる。
呼吸速度測定に用いられる有機性排水６、返送汚泥混合液７、希釈水８は、混合後の有機性排水由来の全ＣＯＤｃｒ濃度が７〜１００ｍｇ／Ｌ、好ましくは、７〜７０ｍｇ／Ｌになるように、また、活性汚泥濃度がＭＬＳＳ３００〜１２００ｍｇ／Ｌ、好ましくは、３００〜８００ｍｇ／Ｌになるように、混合する割合を決める。なお、希釈水７には、対象有機性廃液を生物処理したあとの処理水、純水などが用いられる。 FIG. 2 shows an example of a respiratory rate measuring device used in the present invention. This apparatus includes a stirring device 1, a reaction vessel 2, a dissolved oxygen sensor 3, a dissolved oxygen measuring device 4, and a data recording device 5.
The organic waste water 6, the return sludge mixed solution 7, and the dilution water 8 used for the respiration rate measurement have a total CODcr concentration of 7 to 100 mg / L, preferably 7 to 70 mg / L after mixing. Thus, the mixing ratio is determined so that the activated sludge concentration is MLSS 300 to 1200 mg / L, preferably 300 to 800 mg / L. The diluted water 7 is treated water, pure water or the like after biological treatment of the target organic waste liquid.

返送汚泥混合液７と希釈水８の所定量を混合し、酸素含有気体（空気もしくは酸素）を曝気して、溶存酸素が８ｍｇ／Ｌ程度になるようにしておく。返送汚泥混合液７と希釈水８を混合した液全量を、反応容器２に移し、硝化反応抑制のためにＡＴＵを加える。返送汚泥混合液７と希釈水８を混合した液の入った反応容器２に、有機性排水６の所定量を加え、密栓し、直ちに溶存酸素濃度測定を開始する。反応容器２では、活性汚泥混合液中に存在する微生物の働きで、有機性排水中に存在する易生物分解性有機物を分解するときに溶存酸素を消費する。溶存酸素の減少挙動は、溶存酸素測定装置４にて測定開始から、溶存酸素が０ｍｇ／Ｌになるまで測定し、測定結果はデータ記録装置５に記録する。   A predetermined amount of the return sludge mixed liquid 7 and the dilution water 8 are mixed, and an oxygen-containing gas (air or oxygen) is aerated so that the dissolved oxygen is about 8 mg / L. The total amount of the mixture of the returned sludge mixed solution 7 and the dilution water 8 is transferred to the reaction vessel 2 and ATU is added to suppress the nitrification reaction. A predetermined amount of the organic waste water 6 is added to the reaction vessel 2 containing the mixture of the return sludge mixed solution 7 and the diluting water 8 and sealed, and immediately the measurement of the dissolved oxygen concentration is started. The reaction vessel 2 consumes dissolved oxygen when decomposing readily biodegradable organic substances present in the organic wastewater by the action of microorganisms present in the activated sludge mixed liquid. The decrease behavior of dissolved oxygen is measured from the start of measurement by the dissolved oxygen measuring device 4 until the dissolved oxygen reaches 0 mg / L, and the measurement result is recorded in the data recording device 5.

従来の方法で測定する場合は、有機性排水と活性汚泥混合液を混合して呼吸速度を測定するので、被測定液中の易生物分解性有機物濃度が高く、反応容器２内に存在する溶存酸素だけでは、被測定液中に存在する微生物の働きで易生物分解性有機物のすべてを分解することができないため、測定中に酸素含有気体を曝気することにより、溶存酸素を補給して測定を続ける必要がある。続けて、有機性排水中の易生物分解性有機物が、すべて分解されて呼吸速度の値が低下した後、斜線の部分の面積を計算するために、必要な呼吸速度の値が低下した後のグラフから近似した直線を引けるまで測定を行う。
一方、本発明によると、有機性排水と活性汚泥混合液と希釈水を混合し、ＣＯＤｃｒ濃度が７〜１００ｍｇ／Ｌになるようにするため、被測定液中の易生物分解性有機物濃度が低く、反応容器２内に存在する溶存酸素だけで、混合液中に存在する微生物の働きで易生物分解性有機物がすべて分解され、測定中に溶存酸素を供給する必要がない。
データ記録装置５に記録された溶存酸素のデータを、呼吸速度に変換し、図１を得る。 When measuring by the conventional method, the organic effluent and the activated sludge mixture are mixed to measure the respiration rate, so the concentration of readily biodegradable organic matter in the liquid to be measured is high and dissolved in the reaction vessel 2 Since oxygen alone cannot decompose all readily biodegradable organic substances due to the action of microorganisms present in the liquid to be measured, measurement is performed by supplying dissolved oxygen by aeration of an oxygen-containing gas during measurement. Need to continue. Subsequently, after all the biodegradable organic matter in the organic wastewater has been decomposed and the respiration rate value has decreased, the respiration rate value has been reduced to calculate the area of the shaded area. Measure until an approximate straight line is drawn from the graph.
On the other hand, according to the present invention, the organic waste water, the activated sludge mixed solution and the dilution water are mixed so that the CODcr concentration becomes 7 to 100 mg / L. Only the dissolved oxygen present in the reaction vessel 2 decomposes all readily biodegradable organic substances by the action of microorganisms present in the mixed solution, and there is no need to supply dissolved oxygen during the measurement.
The dissolved oxygen data recorded in the data recording device 5 is converted into a respiration rate to obtain FIG.

実施例１
本発明の図２を用いた呼吸速度測定方法による測定結果を、図３、表１に示す。ＭＬＳＳ濃度が４７００ｍｇ／Ｌの活性汚泥混合液４２ｍｌと希釈水２８０ｍｌを、反応容器２に入れ、溶存酸素濃度が７〜８ｍｇ／Ｌ程度になるまで曝気して、硝化抑制のためのＡＴＵを加えた後、ＣＯＤｃｒ濃度が３２３ｍｇ／Ｌの有機性排水２８ｍｌを加えて密栓し、直ちに溶存酸素の低下挙動を溶存酸素計３により測定し、測定された溶存酸素データをデータ記録装置５に記録した。記録した溶存酸素データを、データ処理装置により呼吸速度に変換した。図３に、溶存酸素の測定結果（ａ）及び呼吸速度の計算結果（ｂ）を示す。測定時間は約３時間で、呼吸速度測定中には酸素含有気体による溶存酸素の供給は行っていない。得られた呼吸速度のグラフ図３により計算された易生物分解性有機物濃度は、６４．４ｍｇ／Ｌであった。遅生物分解性有機物は１４６ｍｇ／Ｌであった。 Example 1
FIG. 3 and Table 1 show the measurement results by the respiratory rate measurement method using FIG. 2 of the present invention. 42 ml of the activated sludge mixed solution with MLSS concentration of 4700 mg / L and 280 ml of diluted water were put into the reaction vessel 2 and aerated until the dissolved oxygen concentration became about 7-8 mg / L, and ATU for nitrification suppression was added. Thereafter, 28 ml of organic waste water having a CODcr concentration of 323 mg / L was added and sealed, and immediately the decrease behavior of dissolved oxygen was measured by the dissolved oxygen meter 3, and the measured dissolved oxygen data was recorded in the data recording device 5. The recorded dissolved oxygen data was converted to respiratory rate by a data processor. FIG. 3 shows the measurement result (a) of the dissolved oxygen and the calculation result (b) of the respiration rate. The measurement time is about 3 hours, and no dissolved oxygen is supplied by the oxygen-containing gas during the measurement of the respiration rate. Graph of respiration rate obtained The readily biodegradable organic matter concentration calculated by FIG. 3 was 64.4 mg / L. Slow biodegradable organic matter was 146 mg / L.

比較例１
一方、従来の方法では、実施例１で易生物分解性有機物を測定した有機性排水と同じ有機性排水３３０ｍｌと、実施例１で使用した活性汚泥混合液と同じ活性汚泥混合液３３ｍｌを、反応容器２に入れ、硝化抑制のためにＡＴＵを加えた後、直ちに溶存酸素の低下挙動を測定し、測定された溶存酸素データをデータ記録装置４に記録する。反応容器２内の溶存酸素濃度が３ｍｇ／Ｌを下回った場合、酸素含有気体を溶存酸素濃度が７ｍｇ／Ｌになるまで曝気する。同じ操作を繰り返し、記録された溶存酸素データをデータ処理装置により呼吸速度に変換する。測定された溶存酸素の結果（ａ）及び計算された呼吸速度測定結果（ｂ）を図４に示した。測定時間は約６時間で、呼吸速度測定中に酸素含有気体の供給を１１回行った。得られた呼吸速度のグラフ図４により計算された易生物分解性有機物は、６３．６ｍｇ／Ｌ、遅生物分解性有機物は１４０ｍｇ／Ｌであった。 Comparative Example 1
On the other hand, in the conventional method, 330 ml of the same organic waste water as the organic waste water in which the biodegradable organic substances were measured in Example 1 and 33 ml of the same activated sludge mixed liquid as the activated sludge mixed liquid used in Example 1 were reacted. After putting in the container 2 and adding ATU to suppress nitrification, the decrease behavior of dissolved oxygen is measured immediately, and the measured dissolved oxygen data is recorded in the data recording device 4. When the dissolved oxygen concentration in the reaction vessel 2 falls below 3 mg / L, the oxygen-containing gas is aerated until the dissolved oxygen concentration reaches 7 mg / L. The same operation is repeated, and the recorded dissolved oxygen data is converted into a respiration rate by a data processor. The measured dissolved oxygen result (a) and the calculated respiration rate measurement result (b) are shown in FIG. The measurement time was about 6 hours, and the oxygen-containing gas was supplied 11 times during the respiration rate measurement. Graph of respiratory rate obtained The readily biodegradable organic matter calculated by FIG. 4 was 63.6 mg / L, and the slow biodegradable organic matter was 140 mg / L.

Figure 2005274170
従来の方法と本発明の方法を用いて同一サンプルで呼吸速度測定を行い、易生物分解性有機物濃度を計算した結果、ほぼ同じ値を得ることができ、本発明の測定時間は、従来の方法より短縮することができる。
Figure 2005274170
 As a result of measuring the respiration rate with the same sample using the conventional method and the method of the present invention and calculating the concentration of readily biodegradable organic matter, almost the same value can be obtained. It can be shortened more.

呼吸速度測定結果から有機物濃度を求めるための説明図。Explanatory drawing for calculating | requiring organic substance density | concentration from a respiration rate measurement result. 本発明で使用する測定装置の一例を示す概略構成図。The schematic block diagram which shows an example of the measuring apparatus used by this invention. 本発明の測定方法を用いた呼吸速度測定結果を示すグラフ、（ａ）溶存酸素、（ｂ）呼吸速度。The graph which shows the respiration rate measurement result using the measuring method of this invention, (a) dissolved oxygen, (b) Respiration rate. 従来の方法を用いた呼吸速度測定結果を示すグラフで、（ａ）溶存酸素、（ｂ）呼吸速度。It is a graph which shows the respiration rate measurement result using the conventional method, (a) dissolved oxygen, (b) respiration rate.

Claims (5)

有機性排水中の易生物分解性有機物濃度及び遅生物分解性有機物濃度を求めるための、前記有機性排水を含む被測定液の活性汚泥による溶存酸素の低下により呼吸速度を算出する呼吸速度測定方法において、前記被測定液として、前記有機性排水、活性汚泥混合液及び希釈水の混合割合を調整して用いることを特徴とする呼吸速度測定方法。   Respiration rate measurement method for calculating respiration rate by reducing dissolved oxygen due to activated sludge of the liquid to be measured containing organic wastewater, in order to obtain the concentration of readily biodegradable organic matter and slow biodegradable organic matter in organic wastewater The respiration rate measuring method according to claim 1, wherein the organic waste water, the activated sludge mixed solution and the dilution water are mixed and used as the measured liquid. 有機性排水中の易生物分解性有機物濃度及び遅生物分解性有機物濃度を求めるための、前記有機性排水を含む被測定液の活性汚泥による溶存酸素の低下により呼吸速度を算出する呼吸速度測定方法において、前記被測定液として、前記有機性排水由来のＣＯＤｃｒ濃度が７〜１００ｍｇ／Ｌ、活性汚泥濃度（ＭＬＳＳ）が３００〜１２００ｍｇ／Ｌ及び初期溶存酸素が６〜８ｍｇ／Ｌになるように、前記有機性排水、活性汚泥混合液及び希釈水の混合割合を調整して用いることを特徴とする呼吸速度測定方法。   Respiration rate measurement method for calculating respiration rate by reducing dissolved oxygen due to activated sludge of the liquid to be measured containing organic wastewater, in order to obtain the concentration of readily biodegradable organic matter and slow biodegradable organic matter in organic wastewater In the measurement liquid, the CODcr concentration derived from the organic waste water is 7 to 100 mg / L, the activated sludge concentration (MLSS) is 300 to 1200 mg / L, and the initial dissolved oxygen is 6 to 8 mg / L. A respiration rate measuring method, wherein the mixing ratio of the organic waste water, the activated sludge mixture and the dilution water is adjusted. 前記溶存酸素の測定は、測定開始から溶存酸素が０ｍｇ／Ｌになるまで行うことを特徴とする請求項１記載の呼吸速度測定方法。   The respiratory rate measurement method according to claim 1, wherein the measurement of the dissolved oxygen is performed from the start of measurement until the dissolved oxygen reaches 0 mg / L. 前記被測定液には、アンモニア性窒素が存在する場合に硝化菌の働きを抑制する薬剤を添加することを特徴とする請求項１又は２記載の呼吸速度測定方法。   The respiratory rate measuring method according to claim 1 or 2, wherein a chemical that suppresses the action of nitrifying bacteria is added to the liquid to be measured when ammoniacal nitrogen is present. 有機性排水中の易生物分解性有機物濃度及び遅生物分解性有機物濃度を求めるための、前記有機性排水を含む被測定液の活性汚泥による溶存酸素の低下を測定する装置と、該測定値により呼吸速度を算出する算出手段とを有する呼吸速度測定装置において、前記被測定液として、前記有機性排水、活性汚泥混合液及び希釈水の混合割合を調整して用いることを特徴とする呼吸速度測定装置。   A device for measuring the decrease in dissolved oxygen due to activated sludge of the liquid to be measured containing the organic wastewater for obtaining the readily biodegradable organic substance concentration and the slow biodegradable organic substance concentration in the organic wastewater, and the measured value In a respiratory rate measuring apparatus having a calculating means for calculating a respiratory rate, a respiratory rate measurement characterized by using a mixture ratio of the organic waste water, activated sludge mixed solution and diluted water as the measured liquid. apparatus.
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CN102944658A (en) * 2012-11-28 2013-02-27 广州中国科学院沈阳自动化研究所分所 Method for analyzing biotoxicity of sewage based on system dissolved oxygen concentration
JP2015131254A (en) * 2014-01-09 2015-07-23 三菱重工業株式会社 System and method for processing industrial wastewater
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102608283A (en) * 2011-01-24 2012-07-25 中国科学院城市环境研究所 Method for rapidly determining biodegradale organic matter in inflow water and outflow water of biological filter
CN102608283B (en) * 2011-01-24 2014-06-18 中国科学院城市环境研究所 Method for rapidly determining biodegradale organic matter in inflow water and outflow water of biological filter
CN102944658A (en) * 2012-11-28 2013-02-27 广州中国科学院沈阳自动化研究所分所 Method for analyzing biotoxicity of sewage based on system dissolved oxygen concentration
JP2015131254A (en) * 2014-01-09 2015-07-23 三菱重工業株式会社 System and method for processing industrial wastewater
CN108459146A (en) * 2018-01-10 2018-08-28 中冶华天工程技术有限公司 Assess method of the waste water to water treatment micro-organism toxicity
CN109354160A (en) * 2018-11-09 2019-02-19 南京大学盐城环保技术与工程研究院 A kind of method of wastewater from chemical industry sub-prime adapter tube
CN111039404A (en) * 2019-12-13 2020-04-21 北京化工大学 Device and method for automatically monitoring biological sludge activity based on multiple parameters
CN110991937A (en) * 2019-12-23 2020-04-10 上海应用技术大学 Evaluation method and experimental device for biodegradability of wastewater

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