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WO2009030296A1 - Method and device for determining the chemical oxygen requirement of water or waste water - Google Patents

Method and device for determining the chemical oxygen requirement of water or waste water Download PDF

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Publication number
WO2009030296A1
WO2009030296A1 PCT/EP2008/005058 EP2008005058W WO2009030296A1 WO 2009030296 A1 WO2009030296 A1 WO 2009030296A1 EP 2008005058 W EP2008005058 W EP 2008005058W WO 2009030296 A1 WO2009030296 A1 WO 2009030296A1
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WO
WIPO (PCT)
Prior art keywords
water
wastewater
waste water
electrode
electrodes
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.)
Ceased
Application number
PCT/EP2008/005058
Other languages
German (de)
French (fr)
Inventor
Werner Arts
Wolfgang Genthe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LAR Process Analysers AG
Original Assignee
LAR Process Analysers AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LAR Process Analysers AG filed Critical LAR Process Analysers AG
Priority to CN200880105285.8A priority Critical patent/CN101815940B/en
Priority to EP08773593A priority patent/EP2188625A1/en
Publication of WO2009030296A1 publication Critical patent/WO2009030296A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/42—Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte
    • G01N27/423—Coulometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]

Definitions

  • the invention relates to a method for determining the chemical oxygen demand of water or wastewater.
  • the invention is therefore based on the object of providing an improved method, which should provide in particular more accurate results in the presence of specific ions in the liquid to be examined. Furthermore, a suitable for carrying out this method measuring device is to be provided.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Emergency Medicine (AREA)
  • Biomedical Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

The invention relates to a method for determining the chemical oxygen requirement of water or waste water, wherein the determination is carried out by the nonspecific electrochemical oxidation of the agents dissolved in a sample of the water or waste water. The current flowing over working electrodes immersed in the water or waste water is a measure of the quantity of ingredients of the water or waste water converted per time unit at the electrodes, and thus of the content of ingredients, wherein measurements are performed in a first measurement step, using water or waste water being moved on at least one electrode, and in a second measuring step, using water or waste water that is substantially static with respect to the electrode, and a difference is formed between the current intensities measured in the first and second measurement steps as a measure of the content of ions of at least one specific element, particularly chlorine.

Description

M/LAM-038-PC MB/HZ/md M / LAM-038-PC MB / HZ / md

VERFAHREN UND VORRICHTUNG ZUR BESTIMMUNG DES CHEMISCHEN SAUERSTOFFBEDARFS VON WASSER ODER ABWASSERMETHOD AND DEVICE FOR DETERMINING THE CHEMICAL OXYGEN NEED FOR WATER OR WASTEWATER

Beschreibungdescription

Die Erfindung betrifft ein Verfahren zur Bestimmung des chemischen Sauerstoffbedarfs von Wasser oder Abwasser.The invention relates to a method for determining the chemical oxygen demand of water or wastewater.

Ein Verfahren dieser Art ist aus der EP 0 282 441 Bl bekannt; zu Elektrodenmaterialien, Verfahrensparametern und Einsatzmöglichkeiten des Verfahrens wird auf diese ausdrücklich Bezug genommen.A method of this kind is known from EP 0 282 441 B1; to electrode materials, process parameters and possible applications of the method is made to this express reference.

Beim Einsatz dieses Verfahrens haben sich in der Vergangenheit gewisse Probleme ergeben, die aus dem Gehalt spezieller Ionen, insbesondere von Chlorionen, in dem zu untersuchenden Wasser oder Abwasser resultieren.Certain problems have arisen in the past with the use of this method, which result from the content of specific ions, in particular chlorine ions, in the water or wastewater to be investigated.

Der Erfindung liegt daher die Aufgabe der Bereitstellung eines verbesserten Verfahrens zugrunde, welches insbesondere genauere Ergebnisse bei Gegenwart spezieller Ionen in der zu untersuchenden Flüssigkeit liefern soll. Weiterhin soll eine zur Durchführung dieses Verfahrens geeignete Messvorrichtung bereitgestellt werden.The invention is therefore based on the object of providing an improved method, which should provide in particular more accurate results in the presence of specific ions in the liquid to be examined. Furthermore, a suitable for carrying out this method measuring device is to be provided.

Diese Aufgabe wird in ihrem Verfahrensaspekt durch ein Verfahren mit den Merkmalen des Anspruchs 1 und in ihrem Vorrichtungsaspekt durch eine Vorrichtung mit den Merkmalen des Anspruchs 4 gelöst. This object is achieved in its method aspect by a method having the features of claim 1 and in its device aspect by a device having the features of claim 4.

Claims

MEISSNER, BOLTE & PARTNER M/LAM-038-PCPatentansprüche MEISSNER, BOLTE & PARTNER M / LAM-038-PCPatentansprüche 1. Verfahren zur Bestimmung des chemischen Sauerstoffbedarfs von Wasser oder Abwasser, wobei die Bestimmung durch unspezifische elektrochemische Oxidation der in einer Probe des Wassers bzw. Abwassers gelösten Stoffe erfolgt, wobei der über in das Wasser oder Abwasser eingetauchte Arbeitselektroden fließende Strom ein Maß für die pro Zeiteinheit an den Elektroden umgesetzte Stoffmenge von Inhaltsstoffen des Wassers bzw. Abwassers und somit für dessen Gehalt an Inhaltsstoffen bildet, wobei in einem ersten Messvorgang mit an mindestens einer Elektrode bewegtem Wasser bzw. Abwasser und in einem zweiten Messvorgang mit bezüglich der Elektrode im wesentlichen ruhendem Wasser bzw. Abwasser gemessen und eine Differenz zwischen den im ersten und zweiten Messvorgang gemessenen Stromstärken ein Maß für den Gehalt an Ionen mindestens eines spezifischen Elementes, insbesondere Chlor, gebildet wird.A method for determining the chemical oxygen demand of water or waste water, wherein the determination by non-specific electrochemical oxidation of substances dissolved in a sample of the water or wastewater is carried out, wherein the flowing over the submerged in the water or wastewater working electrode flow is a measure of the pro Time unit at the electrodes converted substance amount of ingredients of the water or sewage and thus forms for its content of ingredients, in a first measurement with at least one electrode moving water or wastewater and in a second measurement process with respect to the electrode substantially dormant water Measured or a difference between the measured in the first and second measurement currents a measure of the content of ions of at least one specific element, in particular chlorine, is formed. 2. Verfahren nach Anspruch 1, wobei die ermittelte Differenz der Stromstärken in einer Auswertungs-Verarbeitung der Verfahrensergebnisse zur Kompensation eines verfälschenden Einflusses durch die Ionen des mindestens einen spezifischen Elementes genutzt wird.2. The method of claim 1, wherein the determined difference of the current strengths in an evaluation processing of the process results to compensate for a distorting influence by the ions of the at least one specific element is used. 3. Verfahren nach Anspruch 1 oder 2, wobei in dem Wasser oder Abwasser im ersten Messvorgang eine Strömung längs einer Oberfläche der Elektrode erzeugt wird.3. The method of claim 1 or 2, wherein in the water or wastewater in the first measuring process, a flow along a surface of the electrode is generated. 4. Vorrichtung zur Bestimmung des chemischen Sauerstoffbedarfs von Wasser oder Abwasser, wobei die Bestimmung durch unspezifische elektrochemische Oxidation der in einer Probe des Wassers bzw. Abwassers gelösten Stoffe erfolgt, wobei der über in das Wasser oder Abwasser eingetauchte Arbeitselektroden fließende Strom ein Maß für die pro Zeiteinheit an den Elektroden umgesetzte Stoffmenge von Inhaltsstoffen des Wassers bzw. Abwassers und somit für dessen Gehalt an Inhaltsstoffen bildet, mit: in das Wasser oder Abwasser eintauchenden Elektroden, steuerbaren Mitteln zur Erzeugung oder Abschirmung einer Bewegung in MEISSNER, BOLTE & PARTNER M/LAM-038-PC4. A device for determining the chemical oxygen demand of water or waste water, wherein the determination by non-specific electrochemical oxidation of the dissolved in a sample of the water or wastewater substances, wherein the flowing over the submerged in the water or wastewater working electrode current is a measure of the pro Time unit formed at the electrodes substance amount of ingredients of the water or wastewater and thus for its content of ingredients, with: in the water or wastewater immersed electrodes, controllable means for generating or shielding movement in MEISSNER, BOLTE & PARTNER M / LAM-038-PC dem Wasser oder Abwasser im Bereich mindestens einer der Elektroden und einer Strommesseinrichtung zur Erfassung des durch das Wasser oder Abwasser über die Elektroden fließenden Stromes, einer Steuereinrichtung zur Einstellung eines ersten und zweiten Messvorganges, wobei die Steuereinrichtung die Mittel zur Erzeugung oder Abschirmung einer Bewegung in dem Wasser oder Abwasser im ersten Messvorgang in einem ersten und im zweiten Messvorgang in einem zweiten Zustand hält, und einer Auswertungseinrichtung, welche eine Differenzstrom- Erfassungseinrichtung aufweist, die eine Differenz der im ersten und zweiten Messvorgang erfassten Stromstärken ermittelt.the water or waste water in the region of at least one of the electrodes and a current measuring device for detecting the current flowing through the water or waste water through the electrodes, a control device for setting a first and second measuring operation, wherein the control means comprises the means for generating or shielding a movement in the Water or wastewater in the first measurement in a first and in the second measurement process holds in a second state, and an evaluation device which has a differential current detection device which determines a difference of the detected in the first and second measurement currents. 5. Vorrichtung nach Anspruch 4, wobei die Mittel zur Erzeugung einer Bewegung einen Strömungserzeuger oder einen Antrieb zur Bewegung einer Elektrode aufweisen . 5. Apparatus according to claim 4, wherein the means for generating a movement comprise a flow generator or a drive for moving an electrode.
PCT/EP2008/005058 2007-09-03 2008-06-23 Method and device for determining the chemical oxygen requirement of water or waste water Ceased WO2009030296A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200880105285.8A CN101815940B (en) 2007-09-03 2008-06-23 Method and device for determining the chemical oxygen requirement of water or waste water
EP08773593A EP2188625A1 (en) 2007-09-03 2008-06-23 Method and device for determining the chemical oxygen requirement of water or waste water

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007041787 2007-09-03
DE102007041787.1 2007-09-03

Publications (1)

Publication Number Publication Date
WO2009030296A1 true WO2009030296A1 (en) 2009-03-12

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PCT/EP2008/005058 Ceased WO2009030296A1 (en) 2007-09-03 2008-06-23 Method and device for determining the chemical oxygen requirement of water or waste water

Country Status (5)

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EP (1) EP2188625A1 (en)
KR (1) KR20100087280A (en)
CN (1) CN101815940B (en)
RU (1) RU2010108927A (en)
WO (1) WO2009030296A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011510059A (en) * 2008-01-25 2011-03-31 ビー アンド ティー エッセ．エッレ．エッレ． Use of transesterified olive oil in the cosmetics field
CN110967383A (en) * 2019-12-12 2020-04-07 北京沅瀚环境科技有限公司 Electrochemical method for measuring surface water COD

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116699092A (en) * 2023-06-23 2023-09-05 深圳市威标检测技术有限公司 A method for preliminary screening of chemical oxygen demand in chlorine-containing wastewater

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE882315C (en) * 1942-10-08 1953-07-09 Siemens Ag Method for the determination of chemically oxidizable or reducible substances, especially oxygen in water, by measuring depolarization
EP0282441A2 (en) * 1987-03-09 1988-09-14 Ulrich Dr.-Ing. Pilz Method for determining the chemical oxygen demand of water
DE3827577A1 (en) * 1988-08-13 1990-02-15 Siepmann Friedrich W Electrochemical method for determining oxidisable water constituents of an aqueous test liquid by means of anodic oxidation
DE19637704A1 (en) * 1996-09-04 1998-03-05 Lar Analytik Und Umweltmestech Method and device for determining the oxidizability of waste water constituents

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5470484A (en) * 1994-01-13 1995-11-28 Buckman Laboratories International, Inc. Method and apparatus for controlling the feed of water treatment chemicals using a voltammetric sensor
JPH09504376A (en) * 1994-08-12 1997-04-28 チュリッヒ・アクチェンゲゼルシャフト Method and apparatus for solute determination
AUPN363995A0 (en) * 1995-06-19 1995-07-13 Memtec Limited Electrochemical cell
KR101114020B1 (en) * 2003-08-21 2012-04-04 아가매트릭스, 인코포레이티드 Method and apparatus for assay of electrochemical properties

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE882315C (en) * 1942-10-08 1953-07-09 Siemens Ag Method for the determination of chemically oxidizable or reducible substances, especially oxygen in water, by measuring depolarization
EP0282441A2 (en) * 1987-03-09 1988-09-14 Ulrich Dr.-Ing. Pilz Method for determining the chemical oxygen demand of water
DE3827577A1 (en) * 1988-08-13 1990-02-15 Siepmann Friedrich W Electrochemical method for determining oxidisable water constituents of an aqueous test liquid by means of anodic oxidation
DE19637704A1 (en) * 1996-09-04 1998-03-05 Lar Analytik Und Umweltmestech Method and device for determining the oxidizability of waste water constituents

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011510059A (en) * 2008-01-25 2011-03-31 ビー アンド ティー エッセ．エッレ．エッレ． Use of transesterified olive oil in the cosmetics field
CN110967383A (en) * 2019-12-12 2020-04-07 北京沅瀚环境科技有限公司 Electrochemical method for measuring surface water COD
CN110967383B (en) * 2019-12-12 2022-10-04 北京沅瀚环境科技有限公司 Electrochemical method for measuring surface water COD

Also Published As

Publication number Publication date
EP2188625A1 (en) 2010-05-26
CN101815940B (en) 2013-01-02
RU2010108927A (en) 2011-11-27
CN101815940A (en) 2010-08-25
KR20100087280A (en) 2010-08-04

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