EP0082868A1 - Procede de traitement d'un liquide - Google Patents

Procede de traitement d'un liquide

Info

Publication number
EP0082868A1
EP0082868A1 EP19820902167 EP82902167A EP0082868A1 EP 0082868 A1 EP0082868 A1 EP 0082868A1 EP 19820902167 EP19820902167 EP 19820902167 EP 82902167 A EP82902167 A EP 82902167A EP 0082868 A1 EP0082868 A1 EP 0082868A1
Authority
EP
European Patent Office
Prior art keywords
oxygen
phase
change function
measurement
time
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
Application number
EP19820902167
Other languages
German (de)
English (en)
Inventor
Jürgen Zink
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.)
Menzel and Co GmbH
Original Assignee
Menzel and Co GmbH
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 Menzel and Co GmbH filed Critical Menzel and Co GmbH
Publication of EP0082868A1 publication Critical patent/EP0082868A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/006—Regulation methods for biological treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/44—Time

Definitions

  • the invention relates to a method for treating a liquid, in particular wastewater, which is subjected to a nitrification phase and a denitrification phase by controlling the oxygen content.
  • the object of the invention is to improve a method of the type described above for the treatment of a liquid, in particular wastewater, so that extensive fine adjustment of the treatment phases is possible in accordance with the respectively supplied and changing wastewater criteria.
  • the oxygen change function in the decay area (oxygen reduction) of the nitrification phase is determined by means of an oxygen measurement in the wastewater and an associated time requirement for the denitrification phase is determined from the curve shape or the characteristic of the oxygen change function, and the latter is determined when a threshold value of the oxygen content is reached starting timer is specified.
  • An advantage achieved by the invention is that the oxygen change function after switching off the gassing during the nitrification phase is used to determine the denitrification phase, since there is a direct connection here, which enables correct and individual phase control. If the curve of the decrease in oxygen in the wastewater is relatively steep after the ventilation is switched off, there is a strong consumption of oxygen by the activated sludge in the wastewater. So is the time required for the denitrification phase starting from a certain threshold value is correspondingly short. When the oxygen consumption is slow, the oxygen change function has a comparatively gently sloping curve, which means that the denitrification phase must be carried out over a correspondingly long period of time, which takes place automatically according to the invention. There is thus an individual control of the treatment phases of the wastewater that largely satisfies the various requirements.
  • an oxygen change function in the start-up area (oxygen supply) of the nitrification phase by means of an oxygen measurement in the waste water.
  • An assigned tent for the denitrification phase can be determined from the curve shape or the characteristic of the determined oxygen change function.
  • the associated time requirement determined in this way via the oxygen change function is specified as a timing element which is used when a threshold value for the oxygen fraction is reached at the end of the nitrification phase. It is therefore also possible according to the invention to individually determine the duration of the denitrification phase using the oxygen change function in accordance with the different drainage in the waste water during the addition of oxygen for the nitrification phase adapt.
  • the appropriate time unit for the denitrification phase is determined and precisely specified, so that essentially the same advantages described above are given.
  • the measurement process can also be started at a predetermined point in time and can be stopped after the short part-time measurement has ended.
  • the measurement data of the oxygen change function thus determined are advantageously extrapolated using an electronic computer, as a result of which great accuracy is achieved with only a small tolerance range. Using the extrapolated measurement data, the corresponding time requirement or the timing element for the denitrification phase is expediently determined and specified by the same computer.
  • the part-time measurement of the oxygen change function is carried out favorably both in the decay area and in the start-up area in the area of the strongest curvature of the oxygen change function and is preferably carried out in the decay area close to or below a lower threshold value which initiates the denitrification phase, for example is 0.5 mg O 2 per liter waste water.
  • An assigned time requirement for the denitrification phase can be determined and specified from the determined quantity change function.
  • the nitrification phase is also included, so that the time units for nitrification and denitrification can also be regulated via the fluctuating wastewater supply. It is thus possible to achieve largely the same intervals, but with different lengths, with both large and small wastewater feeds, which achieves a high average performance level.
  • the measurement of the quantity change function with respect to the wastewater supply can advantageously be carried out as a short-term interval measurement.
  • the measurement data of the quantity change function determined in this way can be electronically extrapolated to determine the time required for the nitrification and / or denitrification phase.
  • the oxygen change function or its curve shape is flattened from the nitrification phase to the denitrification phase runs, whereby it is possible to achieve at least approximately the same time units for the treatment processes, especially if the ongoing low partial ventilation in the decay area is variable and can be adapted by appropriate control measures.
  • the ongoing partial aeration can correspond approximately to the minimum value that is required to prevent clogging of the fumigation parts in the wastewater from which the oxygen or atmospheric oxygen escapes.
  • the schematic representation of the attached diagram shows that a part-time measurement Tz of the oxygen change function S can be carried out during the introduction of oxygen into the waste water in the start-up area (An) of the nitrification phase N.
  • an upper limit value G When an upper limit value G is reached, the oxygen content in the aerobic region Ae is kept constant.
  • the denitrification time can be determined and specified by the part-time measurement Tz of the oxygen change function S.
  • the oxygen aeration is switched off and the decay region Ab begins.
  • a part-time measurement Tz of the oxygen change function S takes place.
  • the measured data determined are extrapolated, after which a time corresponding to the oxygen change function S is calculated member Z determined and the denitrification phase D is specified.
  • the lenitrification phase D begins at a threshold value Sw, which is approximately 0.5 mg O 2 per liter of wastewater.
  • the curve shape represents an ex ponential function.
  • the consumption of the oxygen fraction is progressively slower.
  • the dashed curve curve refers to a wastewater in which the consumption of oxygen in the decay area Ab is slower. It can be seen that, in the area of the denitrification phase, starting from the threshold value, the consumption of the oxygen fraction is considerably slower due to the exponential function, so that a significantly longer timer for the denitrification phase is predetermined by the measurement control according to the invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Molecular Biology (AREA)
  • Health & Medical Sciences (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Activated Sludge Processes (AREA)

Abstract

Ce procédé de traitement d'un liquide, en particulier d'eaux usées, consiste à soumettre ce liquide à une phase de nitrification (N), suivie d'une phase de dénitrification (D), pendant lesquelles on contrôle, resp. on fait varier la teneur en oxygène de ce liquide. Afin d'obtenir, conformément aux exigences, une commande variable du temps réservé à la phase de dénitrification (D), l'on établit par une mesure de la teneur en oxygène des eaux usées la courbe de variation de l'oxygène dans le domaine d'affaiblissement (Ab) de la phase de nitrification (N). Selon l'allure respectivement selon les caractéristiques de cette courbe (S) l'on déduit le laps de temps nécessaire à la phase de dénitrification (D). La phase de dénitrification (D) se poursuit pendant ce laps de temps, pris comme facteur de temps (Z), après que la teneur en oxygène a atteint une valeur de seuil (Sw).
EP19820902167 1981-07-04 1982-07-01 Procede de traitement d'un liquide Pending EP0082868A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813126412 DE3126412A1 (de) 1981-07-04 1981-07-04 Verfahren zur behandlung einer fluessigkeit
DE3126412 1981-07-04

Publications (1)

Publication Number Publication Date
EP0082868A1 true EP0082868A1 (fr) 1983-07-06

Family

ID=6136104

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19820902167 Pending EP0082868A1 (fr) 1981-07-04 1982-07-01 Procede de traitement d'un liquide
EP82105883A Withdrawn EP0069353A1 (fr) 1981-07-04 1982-07-01 Procédé pour le traitement d'un liquide

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP82105883A Withdrawn EP0069353A1 (fr) 1981-07-04 1982-07-01 Procédé pour le traitement d'un liquide

Country Status (5)

Country Link
EP (2) EP0082868A1 (fr)
JP (1) JPS58501022A (fr)
DE (1) DE3126412A1 (fr)
DK (1) DK107683D0 (fr)
WO (1) WO1983000143A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0205496A1 (fr) * 1984-12-21 1986-12-30 Commonwealth Scientific And Industrial Research Organisation Nitrification/denitrification de dechets
GB8530548D0 (en) * 1985-12-11 1986-01-22 Boc Group Plc Treatment for aqueous material
JPH0665399B2 (ja) * 1986-09-09 1994-08-24 株式会社西原環境衛生研究所 間欠曝気式による活性汚泥処理方法およびその装置
DE3835374A1 (de) * 1988-10-18 1990-04-19 Boes Manfred Verfahren zur reinigung von abwasser in einem belebungsbecken
DE3914357C2 (de) * 1989-04-29 1997-07-17 Gero Froese Steuerungsanordnung und Verfahren zur Steuerung der mikrobiellen Behandlung von Abwässern
DE4024947A1 (de) * 1990-08-07 1992-02-13 Stewing Verwaltungsgesellschaf Verfahren und klaeranlage zum reinigen von abwasser
DE4140915C2 (de) * 1991-04-20 2000-06-08 Intech Pev Informationstechnis Kläranlage mit einstufigem Belebungsbecken und einem Reglersystem für die biochemischen Prozesse
DE4417259C2 (de) * 1994-05-17 2000-09-21 Rwe Umwelt Ag Verfahren zum Reinigen von Abwasser mittels Belebtschlamm
EP0854843B1 (fr) * 1995-06-22 2005-12-21 Bisasco, Pty. Limited Traitement de controle des eaux usees par surveillance des taux de consommation d'oxygene
CZ298936B6 (cs) * 2005-05-11 2008-03-19 Microsys Brno, S.R.O. Zpusob rízení provzdušnování pri biologickém cištení odpadních vod
DE102020000082A1 (de) * 2020-01-07 2021-07-08 Lorenz Hanewinkel Interferometer zur Laufzeitdifferenz- und Gravitationsvermessung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159243A (en) * 1977-08-09 1979-06-26 Envirotech Corporation Process and system for controlling an orbital system
DE2910015C2 (de) * 1979-03-14 1983-10-13 August Dr.-Ing. 3000 Hannover Schreiber Verfahren zur Sauerstoffbegasung eines Abwasser-Belebtschlammgemisches und zur Denitrifikation des Abwassers
DE2936884A1 (de) * 1979-09-12 1981-03-19 Schreiber, August, Dr.-Ing., 3000 Hannover Verfahren und einrichtung zur abwasserreinigung mittels belebtschlamm

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8300143A1 *

Also Published As

Publication number Publication date
DE3126412A1 (de) 1983-01-27
DK107683A (da) 1983-03-03
EP0069353A1 (fr) 1983-01-12
JPS58501022A (ja) 1983-06-30
DK107683D0 (da) 1983-03-03
WO1983000143A1 (fr) 1983-01-20

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Effective date: 19830621

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RIN1 Information on inventor provided before grant (corrected)

Inventor name: ZINK, JUERGEN