EP0000006B1 - Verfahren für die Nitrifikation von Abwasser - Google Patents

Verfahren für die Nitrifikation von Abwasser Download PDF

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Publication number
EP0000006B1
EP0000006B1 EP78200030A EP78200030A EP0000006B1 EP 0000006 B1 EP0000006 B1 EP 0000006B1 EP 78200030 A EP78200030 A EP 78200030A EP 78200030 A EP78200030 A EP 78200030A EP 0000006 B1 EP0000006 B1 EP 0000006B1
Authority
EP
European Patent Office
Prior art keywords
column
gas
process according
molecular oxygen
nitrification
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
Application number
EP78200030A
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English (en)
French (fr)
Other versions
EP0000006A1 (de
Inventor
Gerhard Bakker
Fokke Dijkstra
Johannes Petrus Zeeman
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.)
Stamicarbon BV
Original Assignee
Stamicarbon BV
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Publication date
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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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters
    • 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

Definitions

  • the invention relates to a process for nitrification of oxidizable nitrogen compounds in waste water, with the aid of a gas containing molecular oxygen and of micro-organismus bound to an inert carrier material in a column, wherein the off gas of the column is vented and/or recycled, and, if necessary, part of the effluent is recycled.
  • This process has the drawback that only waste water streams with a relatively low nitrogen content can be purified. Moreover, the absolute quantity of dissolved organic material must be very low, as an excess of organic material results in partial clogging of the column with micro-organisms decomposing organic materials, so that channelling occurs.
  • the micro-organisms (activated sludge in general) are washed off from the carrier material, so that an additional column is needed to remove these micro-organisms from the waste water.
  • the purpose of the invention is to provide a process for nitrification of waste water which has no such drawbacks.
  • This process is characterized in that a trickle-phase reactor is used as the column, and the gas containing molecular oxygen contains at least 25 w.-% of oxygen, that during the nitrification 0.5-10 W .-% of C0 2 , with respect to the total quantity of molecular oxygen, is present in the column, that such a quantity of the liquid effluent of the reactor is recycled that the entire column contents are irrigated, and that the gas and the liquid contact each other counter-currently.
  • the gas containing molecular oxygen contains at least 90 w.-% of molecular oxygen.
  • the process according to the invention has the advantage that waste water containing large quantities of nitrogen compounds can be purified without the need for excessively large columns. Furthermore the problem of sludge being washed off from the carrier material does not become significant.
  • technical oxygen or mixtures of air and technical oxygen are_applied to which also carbon dioxide has been added.
  • Technical oxygen is obtained by cryogenic air separation and it contains approximately 90 vol.-% of oxygen, 50 ppm C0 2 and, for the rest, nitrogen and traces of other gases, such as rare gases.
  • Nitrobacter Two well-known bacterial genera nitrifying autotrophically are Nitrobacter and Nitrosomo- nas. The type mentioned last oxidizes NH4 to N0 2 in the following manner: Nitrobacter oxidizes N02 further to N0 3 :
  • These bacteria are autotrophic because they can assimilate cell material from carbon dioxide.
  • the energy required for the assimilation originates from the oxidation of the nitrogen compounds.
  • the C0 2 addition here has an essentially different function than the addition of, for instance, methanol to a denitrification step, in which methanol functions as oxygen acceptor. Hence, in the denitrification, there is no point in adding CO 2 .
  • the extent to which the gas supplied to the column is discharged again and/or recycled depends on a number of factors. In principle, the situation is such that a minor part of the gas mass must invariably be discharged because otherwise a quantity of inert gas will accumulate in the column.
  • the inert gas originates from the gas supplied, which can in practically no case consist exclusively of 0 2 and C0 2 .
  • the gas containing molecular oxygen contain a considerable (more than 20%) amount of inert gas
  • the risk of an inhomogeneous distribution of molecular oxygen in the column is avoided this way.
  • the vent amounts to 1-10 w.-% of the total circulating gas stream.
  • the recirculating waste water is given a pH value higher than 8 before being returned to the column.
  • NaOH can be added very suitably for this purpose.
  • the process according to the invention offers the advantage that there is a possibility of smaller gas volumes and, hence, cheaper apparatus. Contrary, for instance, to a column in which outside air is aspirated in the bottom, part to be discharged again at the top, no strong cooling of the contents of the column occurs through water evaporation. In the process according to the invention an equilibrium is formed after some time owing to the gas mass being approximately saturated with water vapour.
  • the process according to the invention is carried out in a column suitable for gas/liquid contact whict. is a trickle-phase reactor and wherein the gas and the waste water are contacted counter-currently.
  • the pressure at which the process is carried out is not critical. Atmospheric pressure is applied to advantage, but also higher or lower pressures are applicable. It is noted that the presence of micro-organisms on an inert carrier material is a well-known fact.
  • nitrification does not proceed completely to nitrate, but partly only to nitrite.
  • This effect is achieved by taking care that the formation of nitrate from nitrite is checked, which is possible by either seeing to it that no nitrate-forming organisms are present in the sludge, or that the organisms present are restrained. Also if the sludge is loaded with waste water containing NH4-N in a high concentration, conversion to, mainly, nitrite is obtained.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)

Claims (7)

1. Verfahren zum Nitrifizieren oxidierbarer Stickstoffverbindungen in Abwasser mit Hilfe eines Molekularsauerstoff enthaltenden Gases und von Mikroorganismen, die auf einem Trägermaterial in eine Kolonne aufgebracht sind, wobei man das Abgas der Kolonne abläßt und/oder zurückführt und, falls notwendig, einen Teil des flüssigen Ablaufs zurückführt, dadurch gekennzeichnet, daß man als Kolonne einen Berieselungsreaktor einsetzt, daß das Molekularsauerstoff enthaltende Gas zumindest 25 Gew.-% Molekularsauerstoff enthält, daß während des Nitrifizierens 0,5-10 Gew.-% C02, bezogen auf die Gesamtsauerstoffmenge, in der Kolonne enthalten sind, daß man soviel vom flüssigen Ablauf der Kolonne zurückführt, daß eine vollständige Berieselung des Kolonneninhalts auftritt und daß das Gas und die Flüssigkeit im Gegenstrom miteinander in Berührung kommen.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Gas mindestens 90 Gew.-% Molekularsauerstoff enthält.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß 5-10 Gew.-% C02, bezogen auf die Gesamtmenge des Molekularsauerstoffs, vorhanden sind.
4. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß der Ablaß 1-10 Gew.-% des gesamten umlaufenden Gasstroms beträgt.
5. Verfahren nach Anspruch 1-4, dadurch gekennzeichnet, daß man den flüssigen Ablauf, ehe er der Kolonne zurückgeführt wird, auf einen pH-Wert von mindestens 8 bringt.
6. Verfahren nach Anspruch 1 -5, dadurch gekennzeichnet, daß das Molekularsauerstoff enthaltende Gas, das man der Kolonne zuführt, wasserdampfgesättigt ist.
7. Verfahren nach Anspruch 1-6, dadurch gekennzeichnet, daß die Nitrifizierung hauptsächlich zu Nitrit verläuft.
EP78200030A 1977-06-06 1978-06-01 Verfahren für die Nitrifikation von Abwasser Expired EP0000006B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7706189A NL7706189A (nl) 1977-06-06 1977-06-06 Werkwijze voor nitrificeren van afvalwater.
NL7706189 1977-06-06

Publications (2)

Publication Number Publication Date
EP0000006A1 EP0000006A1 (de) 1978-12-20
EP0000006B1 true EP0000006B1 (de) 1981-02-04

Family

ID=19828668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78200030A Expired EP0000006B1 (de) 1977-06-06 1978-06-01 Verfahren für die Nitrifikation von Abwasser

Country Status (3)

Country Link
EP (1) EP0000006B1 (de)
DE (1) DE2860387D1 (de)
NL (1) NL7706189A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2108658B1 (es) * 1996-06-12 1998-07-01 Ros Roca Sa Procedimiento biologico de depuracion de residuos liquidos de alta carga contaminante y/o alta toxicidad, en especial purines y alpechines.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3487014A (en) * 1967-05-23 1969-12-30 Johan Ragnar Liljegren Methods of improving and safeguarding the function of biologically operating purification plants
DE2346881A1 (de) * 1971-01-08 1975-04-03 Wilhelm Hagstotz Biologische reinigung von wasser mittels reinem sauerstoff
US3764523A (en) * 1972-05-01 1973-10-09 Union Carbide Corp Nitrification of bod-containing water

Also Published As

Publication number Publication date
NL7706189A (nl) 1978-12-08
DE2860387D1 (en) 1981-03-19
EP0000006A1 (de) 1978-12-20

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