EP0597928A1 - Method of processing untreated drinking water contaminated with organic substances - Google Patents

Method of processing untreated drinking water contaminated with organic substances

Info

Publication number
EP0597928A1
EP0597928A1 EP92916380A EP92916380A EP0597928A1 EP 0597928 A1 EP0597928 A1 EP 0597928A1 EP 92916380 A EP92916380 A EP 92916380A EP 92916380 A EP92916380 A EP 92916380A EP 0597928 A1 EP0597928 A1 EP 0597928A1
Authority
EP
European Patent Office
Prior art keywords
drinking water
light
wavelength
lamp
lamps
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.)
Withdrawn
Application number
EP92916380A
Other languages
German (de)
French (fr)
Inventor
Wilfried Werz
Karl F. Massholder
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.)
Ultra Systems GmbH UV Oxidation
Original Assignee
Ultra Systems GmbH UV Oxidation
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
Priority claimed from DE4124843A external-priority patent/DE4124843A1/en
Priority claimed from DE19924212604 external-priority patent/DE4212604A1/en
Application filed by Ultra Systems GmbH UV Oxidation filed Critical Ultra Systems GmbH UV Oxidation
Publication of EP0597928A1 publication Critical patent/EP0597928A1/en
Withdrawn legal-status Critical Current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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C02F1/325—Irradiation devices or lamp constructions

Definitions

  • the present invention relates to a method of the type designated according to the preamble of claim 1 and a device according to the preamble of claim 8.
  • Atrazine has become a major problem. Although it is possible to reduce the atrazine content by means of suitable treatment measures, this is predominantly to be carried out by means of filtration and adsorption with the correspondingly high outlay. These measures are all extremely expensive and involve high investments. In order to meet the guidelines laid down by the European Community with regard to the maximum exposure to, for example, atrazine, the water-producing companies must therefore make enormous efforts.
  • DE-OS 27 35 550 discloses a method for cleaning, in particular for disinfection and disinfection of flowable media in a flow reactor with a predetermined minimum radiation, ie minimum dose, ultraviolet radiation predominantly in the wavelength range from 240-320 nm.
  • the invention also relates to a device for Aus ⁇ Practice of such a method, consisting of one Radiation sources with at least one radiator which emits ultra violet radiation in the wavelength range from 240-320 nm, associated flow reactor with a feed line and a discharge line for the medium to be irradiated and with a monitoring device for the ultraviolet radiation passing through the flow reactor.
  • the technical problem on which the invention is based is therefore to provide a method which makes it possible to avoid the disadvantages mentioned above.
  • the process should be able to be carried out continuously and avoid subsequent oxidative treatment of the drinking water to be treated.
  • the method should be able to be carried out by means of a device adapted to it.
  • wavelengths in the range of in particular> 230 nm enables organic compounds, in particular crop protection agents such as atrazine, to be destroyed without the nitrate being converted to nitrite in the process.
  • crop protection agents such as atrazine
  • the wavelength range can advantageously be selected by means of UV filters. This is preferably done with filters that are made of high-purity quartz in large layer thicknesses such as. B. Heralux (20 mm) from Heraeus (Hanau) or cheaper materials such. B. Infralux M 235 / M 282 are made in sufficient layer thickness from Heraeus (Hanau).
  • UV lamps that meet these requirements are particularly z.
  • auxiliary chemicals for the treatment of the raw drinking water.
  • auxiliary chemicals such as formic acid and its salts, acetic acid, ethanol, citric acid, tartaric acid, glucose and reducing sugars, other organic, reducing hydroxy compounds as well as ammonia, urea and amine derivative, such as amidosulfonic acid, into consideration, since these support the destruction of nitrite.
  • UV light is used, which also has higher proportions of wavelengths less than 230 nm.
  • a device suitable for carrying out the method according to the invention is proposed in P 40 25 078.4.
  • the device described therein has a flow-through reactor, at least one UV lamp and supply and discharge lines and is characterized in that a surface which strongly reflects UV light is arranged in the reactor and a turbulent flow can be generated or stabilized. At flow rates which are below the critical Reynolds number, this can be ensured by means of devices which are arranged on or in front of the UV-reflecting surface.
  • the devices can advantageously be arranged in the liquid flow both inside the reactor and before the medium to be treated enters the reactor.
  • Another variant of the generation of the turbulent flow is based on a tangential inflow of the liquid flow into the reactor.
  • the UV lamps to be used here can in particular be designed as UV immersion lamps.
  • the figure shows a particularly preferred embodiment.
  • the reactor 1 has feed and discharge lines.
  • the UV lamp (2) is designed here as a diving lamp.
  • the outer wall of the immersion tube (3) consists of a glass which acts as a UV filter for wavelengths ⁇ 230 nm.
  • Infralux M 235 from Heraeus is used as the material for the wall of the immersion tube (3) in question.
  • the supply and discharge lines (4, 5) are provided for the inlet and outlet of nitrogen. It has been shown that the use of an inert gas between the UV lamp (2) and the outer wall of the dip tube (3) prevents the formation of undesirable gaseous by-products.
  • the device according to the figure has on the inner wall of the reactor, which is preferably made of polished stainless steel, devices in the form of protuberances which lead to turbulent flows within the reactor. At higher flow rates, the devices can be omitted if the critical Reynolds number is exceeded.
  • An advantage of the process according to the invention is that continuous process control for the degradation of organic compounds, in particular crop protection agents such as atrazine, is made possible, without oxidizing substances such as H 2 O, for the re-oxidation of the nitrite formed by photo-chemical reactions to nitrate.

Landscapes

  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physical Water Treatments (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

Un procédé permet d'épurer par exposition à la lumière ultraviolette de l'eau potable brute contaminée par des substances organiques, notamment l'eau potable brute contenant des nitrates et contaminée par des produits phytosanitaires. L'eau potable brute est exposée à: a) une lumière ultraviolette ayant une longueur d'onde supérieure à 230 nm ou à: b) une lumière ultraviolette contenant également des fractions d'une longueur d'onde inférieure à 230 nm associée à des substances détruisant les nitrures. Un dispositif particulièrement approprié pour mettre en oeuvre le procédé comprend, dans le trajet des rayons entre la lampe UV et l'eau potable brute, des dispositifs de filtrage qui laissent passer la lumière ultraviolette d'une longueur d'onde égale ou supérieure à 230 nm. On peut également utiliser des lampes UV qui ne génèrent essentiellement pas de rayonnements UV à longueur d'onde inférieure à 230 nm.A process makes it possible to purify by exposure to ultraviolet light raw drinking water contaminated with organic substances, in particular raw drinking water containing nitrates and contaminated with phytosanitary products. Raw drinking water is exposed to: a) ultraviolet light having a wavelength greater than 230 nm or: b) ultraviolet light also containing fractions of a wavelength less than 230 nm associated with nitride destroying substances. A device particularly suitable for carrying out the method comprises, in the path of the rays between the UV lamp and the raw drinking water, filtering devices which allow the passage of ultraviolet light of a wavelength equal to or greater than 230 n. It is also possible to use UV lamps which essentially do not generate UV radiation at a wavelength of less than 230 nm.

Description

"Verfahren zur Aufbereitung von mit organischen Substanzen belastetem Rohtrinkwasser""Process for the treatment of raw drinking water contaminated with organic substances"

Gegenstand der vorliegenden Erfindung ist ein Verfahren der gemäß Oberbegriff des Anspruchs 1 und eine Vorrich¬ tung gemäß Oberbegriff des Anspruchs 8 bezeichneten Art.The present invention relates to a method of the type designated according to the preamble of claim 1 and a device according to the preamble of claim 8.

Die Verunreinigung des zur Gewinnung von Trinkwasser vor¬ gesehenen Rohtrinkwassers mit organischen Verbindungen, insbesondere Pflanzenschutzmitteln wie z. B. Atrazin ist zu einem großen Problem geworden. Es ist zwar möglich durch geeignete Aufbereitungsmaßnahmen den Atrazingehalt zu reduzieren, jedoch ist dies überwiegend durch Filtra¬ tionen und Adsorptionen mit dem entsprechend hohen Auf¬ wand durchzuführen. Diese Maßnahmen sind allesamt extrem kostspielig und mit hohen Investitionen verbunden. Um den von der Europäischen Gemeinschaft festgelegten Richtlinien bezüglich der Höchstbelastung mit beispielsweise Atrazin gerecht zu werden, müssen somit die wassererzeugenden Be¬ triebe enorme Anstrengungen entwickeln.Contamination of the raw drinking water provided for the production of drinking water with organic compounds, in particular pesticides such. B. Atrazine has become a major problem. Although it is possible to reduce the atrazine content by means of suitable treatment measures, this is predominantly to be carried out by means of filtration and adsorption with the correspondingly high outlay. These measures are all extremely expensive and involve high investments. In order to meet the guidelines laid down by the European Community with regard to the maximum exposure to, for example, atrazine, the water-producing companies must therefore make enormous efforts.

In Chemical Abstracts, Vol. 104, 1986, S. 422, Ref.Nr. 155599S, wird ein Verfahren zur Photolyse von pestizid- haltigen Lösungen mit UV-Licht bei einer Wellenlänge von 365-366 nm angegeben.In Chemical Abstracts, Vol. 104, 1986, p. 422, ref. No. 155599S, a method for the photolysis of pesticide-containing solutions with UV light at a wavelength of 365-366 nm is specified.

Die DE-OS 27 35 550 offenbart ein Verfahren zur Reinigung, insbesondere zur Entkeimung und Desinfektion fließfähiger Medien in einem Durchflußreaktor mit einer vorbestimmten Mindestbestrahlung, d.h. Mindestdosis, ultravioletter Strahlung überwiegend im Wellenlängenbereich von 240-320 nm. Die Erfindung betrifft auch eine Vorrichtung zur Aus¬ übung eines solchen Verfahrens, bestehend aus einem einer Strahlungsguelle mit mindestens einem Strahler, der ultra¬ violette Strahlung im Wellenlängenbereich von 240-320 nm emittiert, zugeordneten Durchflußreaktor mit einer Zulei¬ tung und einer Ableitung für das zu bestrahlende Medium und mit einer Überwachungsreinrichtung für die den Durch¬ flußreaktor durchsetzende ultraviolette Strahlung.DE-OS 27 35 550 discloses a method for cleaning, in particular for disinfection and disinfection of flowable media in a flow reactor with a predetermined minimum radiation, ie minimum dose, ultraviolet radiation predominantly in the wavelength range from 240-320 nm. The invention also relates to a device for Aus ¬ Practice of such a method, consisting of one Radiation sources with at least one radiator which emits ultra violet radiation in the wavelength range from 240-320 nm, associated flow reactor with a feed line and a discharge line for the medium to be irradiated and with a monitoring device for the ultraviolet radiation passing through the flow reactor.

Eine photochemische Eliminierung organischer Substanzen, wie sie bereits in den Patentanmeldungen P 39 03 549 und P 40 16 514 beschrieben werden, sind nicht auf die Auf¬ bereitung von Trinkwasser übertragbar. Dies beruht auf der Tatsache, daß die Verunreinigungen die durch Atrazin- kontaminationen verursacht sind, überwiegend aus dem land¬ wirtschaftlichen Bereich stammen. Damit ist dann jedoch auch regelmäßig eine hohe Nitratbelastung des aufzube reitenden Trinkwassers verbunden. Durch photochemische Behandlung des Trinkwassers wird nun das Nitrat teilweise zum Nitrit reduziert. Dabei können die Grenzwerte der Trinkwasserverordnung (TVO) überschritten werden. Nitrit jedoch ist als kanzerogene Substanz bekannt. Um das Nitrit wiederum in das relativ unschädliche Nitrat zu überführen, müssen Oxidationsmittel zugesetzt werden, wie beispiels¬ weise Wasserstoffperoxid. Das führt dazu, daß dann über¬ schüssiges Wasserstoffperoxid gemäß TVO wieder dem Trink¬ wasser entzogen werden muß. Dies ist jedoch nicht nur aufwendig, sondern auch kostenintensiv.Photochemical elimination of organic substances, as already described in patent applications P 39 03 549 and P 40 16 514, cannot be transferred to the treatment of drinking water. This is based on the fact that the impurities caused by atrazine contamination mainly come from the agricultural sector. However, this is then also regularly associated with high nitrate pollution in the drinking water to be treated. The nitrate is now partially reduced to nitrite by photochemical treatment of the drinking water. The limits of the Drinking Water Ordinance (TVO) can be exceeded. However, nitrite is known to be a carcinogenic substance. In order to convert the nitrite into the relatively harmless nitrate, oxidizing agents, such as hydrogen peroxide, must be added. This means that excess hydrogen peroxide then has to be removed from the drinking water in accordance with TVO. However, this is not only complex, but also cost-intensive.

Das der Erfindung zugrundeliegende technische Problem ist es somit, ein Verfahren bereitzustellen, das es ermög¬ licht, die oben genannten Nachteile zu vermeiden. Das Verfahren soll insbesondere kontinuierlich durchführbar sein und eine nachträgliche oxidative Behandlung des auf¬ zubereitenden Trinkwassers vermeiden. Das Verfahren soll mittels einer daran angepaßten Vorrichtung durchgeführt werden können.The technical problem on which the invention is based is therefore to provide a method which makes it possible to avoid the disadvantages mentioned above. In particular, the process should be able to be carried out continuously and avoid subsequent oxidative treatment of the drinking water to be treated. The method should be able to be carried out by means of a device adapted to it.

Das der Erfindung zugrundeliegende technische Problem wird mit einem Verfahren gemäß den Merkmalen des Anspruchs 1 gelöst. Die Unteransprüche betreffen bevorzugte Aus- führungsformen des erfindungsgemäßen Verfahrens. Eine dem erfindungsgemäßen Verfahren angepaßte Vorrichtung wird durch die Merkmale des Anspruchs 8 beschrieben.The technical problem underlying the invention is solved with a method according to the features of claim 1. The subclaims relate to preferred embodiments of the method according to the invention. A device adapted to the method according to the invention is described by the features of claim 8.

Es hat sich gezeigt, daß die Verwendung von Wellenlängen im Bereich von insbesondere > 230 nm eine Zerstörung or¬ ganischer Verbindungen, insbesondere Pflanzenschutzmit¬ teln wie Atrazin, ermöglicht, ohne daß dabei das Nitrat zu Nitrit umgewandelt wird. Bei Verwendung der genannten Wellenlängen wird die Reduktion von Nitrat zu Nitrit ver¬ mieden, so daß auch eine Nachbehandlung des Wassers, wie sie bei Verwendung niedrigerer Wellenlängen erforderlich wird, nicht durchgeführt zu werden braucht.It has been shown that the use of wavelengths in the range of in particular> 230 nm enables organic compounds, in particular crop protection agents such as atrazine, to be destroyed without the nitrate being converted to nitrite in the process. When using the wavelengths mentioned, the reduction of nitrate to nitrite is avoided, so that post-treatment of the water, as is required when using lower wavelengths, does not have to be carried out.

In vorteilhafter Weise kann der Wellenlängenbereich mit¬ tels UV-Filtern ausgewählt werden. Dies geschieht vor¬ zugsweise mit Filtern, die aus hochreinen Quarzen in großen Schichtdicken wie z. B. Heralux (20 mm) der Fa. Heraeus (Hanau) oder preiswerteren Materialien wie z. B. Infralux M 235/M 282 in ausreichender Schichtdicke der Fa. Heraeus (Hanau) hergestellt sind.The wavelength range can advantageously be selected by means of UV filters. This is preferably done with filters that are made of high-purity quartz in large layer thicknesses such as. B. Heralux (20 mm) from Heraeus (Hanau) or cheaper materials such. B. Infralux M 235 / M 282 are made in sufficient layer thickness from Heraeus (Hanau).

Es ist ebenfalls möglich, mittels speziell ausgestalteter UV-Lampen dafür Sorge zu tragen, daß das Emissionsspek¬ trum der verwendeten Lampen keine wesentlichen Anteile mehr < 230 nm aufweist. UV-Lampen, die diese Anorderungen erfüllen, sind insbesondere z. B. dotierte UV-Tauch¬ strahler der Fa. Heraeus: ZI, Z2, Z3, Z4 oder allgemein Edelgas-Entladungslampen.It is also possible to use specially designed UV lamps to ensure that the emission spectrum of the lamps used no longer has any significant proportions <230 nm. UV lamps that meet these requirements are particularly z. B. doped UV immersion lamps from Heraeus: ZI, Z2, Z3, Z4 or generally noble gas discharge lamps.

Es ist mit dem erfindungsgemäßen Verfahren ebenfalls ver¬ einbar Hilfschemikalien zur Aufbereitung des Rohtrink¬ wassers einzubringen. Insbesondere kommen Hilfschemikalien wie Ameisensäure und deren Salze, Essigsäure, Ethanol, Citronensäure, Weinsäure, Glucose und reduzierende Zucker, sonstige organische, reduzierend wirkende Hydroxyverbin- dungen sowie Ammoniak, Harnstoff und Aminderivat , wie Amidosulfonsäure, in Betracht, da diese die Zerstörung von Nitrit unterstützen. Dies ist dann zu empfehlen, wenn UV-Licht verwendet wird, das auch höhere Anteile an Wellenlängen kleiner 230 nm aufweist.It is also compatible with the method according to the invention to introduce auxiliary chemicals for the treatment of the raw drinking water. In particular, auxiliary chemicals such as formic acid and its salts, acetic acid, ethanol, citric acid, tartaric acid, glucose and reducing sugars, other organic, reducing hydroxy compounds as well as ammonia, urea and amine derivative, such as amidosulfonic acid, into consideration, since these support the destruction of nitrite. This is recommended if UV light is used, which also has higher proportions of wavelengths less than 230 nm.

Eine zur Durchführung des erfindungsge äßen Verfahrens geeignete Vorrichtung wird in der P 40 25 078.4 vorge¬ schlagen. Die dort beschriebene Vorrichtung weist einen durchströmten Reaktor, mindestens eine UV-Lampe sowie Zu- und Ableitungen auf und ist dadurch charakterisiert, daß im Reaktor eine stark UV-Licht reflektierende Oberfläche angeordnet ist und eine turbulente Strömung erzeugt bzw. stabilisiert werden kann. Dies kann bei Durchflußgeschwin¬ digkeiten, die unterhalb der kritischen Reynolds-Zahl liegen, durch Einrichtungen gewährleistet werden, die auf oder vor der UV-reflektierenden Oberfläche angeordnet sind. Die Einrichtungen können in vorteilhafter Weise sowohl innerhalb des Reaktors wie auch vor Eintritt des zu behandelnden Mediums in den Reaktor im Flüssigkeits¬ strom angeordnet sein.A device suitable for carrying out the method according to the invention is proposed in P 40 25 078.4. The device described therein has a flow-through reactor, at least one UV lamp and supply and discharge lines and is characterized in that a surface which strongly reflects UV light is arranged in the reactor and a turbulent flow can be generated or stabilized. At flow rates which are below the critical Reynolds number, this can be ensured by means of devices which are arranged on or in front of the UV-reflecting surface. The devices can advantageously be arranged in the liquid flow both inside the reactor and before the medium to be treated enters the reactor.

Eine andere Variante der Erzeugung der turbulenten Strömung beruht auf einer tangentialen Einströmung des Flüssigkeitsstroms in den Reaktor.Another variant of the generation of the turbulent flow is based on a tangential inflow of the liquid flow into the reactor.

Wird die Reynolds-Zahl, die von der Geometrie des Reaktors und der jeweiligen Durchflußgeschwindigkeit des zu behan¬ delnden Mediums abhängt, überschritten, wird eine turbu¬ lente Strömung im Flüssigkeitsström auch ohne diese unter¬ stützenden Einrichtungen erzeugt. Die dabei zu verwenden¬ den UV-Lampen können insbesondere als UV-Tauchlampen aus¬ gebildet werden.If the Reynolds number, which depends on the geometry of the reactor and the respective flow rate of the medium to be treated, is exceeded, a turbulent flow in the liquid flow is generated even without these supporting devices. The UV lamps to be used here can in particular be designed as UV immersion lamps.

Die Figur zeigt eine besonders bevorzugte Ausführungs- form. Der Reaktor 1 weist Zu- und Ableitungen auf. Die UV-Lampe- (2) ist hier als Tauchlampe ausgebildet. Die Außenwand des Tauchrohres (3) besteht in einer besonders bevorzugten Ausführungsform aus einem Glas, welches als UV-Filter wirkt für Wellenlängen < 230 nm. Als Material für die Wand des Tauchrohres (3) kommt insbesondere In- fralux M 235 der Fa. Heraeus in Frage. Die Zu- und Ab¬ leitungen (4, 5) sind für den Einlaß bzw. Auslaß von Stick¬ stoff vorgesehen. Es hat sich gezeigt, daß die Verwendung eines inerten Gases zwischen der UV-Lampe (2) und der Außenwand des Tauchrohrs (3) die Bildung unerwünschter gasförmiger Nebenprodukte verhindert. Die Vorrichtung gemäß der Figur weist auf der Innenwand des Reaktors, der vorzugsweise aus poliertem Edelstahl besteht, Einrich¬ tungen in Form von Protuberanzen auf, die zu turbulenten Strömungen innerhalb des Reaktors führen. Bei höheren Durchflußraten können die Einrichtungen entfallen, sofern die kritische Reynolds-Zahl überschritten wird.The figure shows a particularly preferred embodiment. The reactor 1 has feed and discharge lines. The UV lamp (2) is designed here as a diving lamp. In a particularly preferred embodiment, the outer wall of the immersion tube (3) consists of a glass which acts as a UV filter for wavelengths <230 nm. In particular, Infralux M 235 from Heraeus is used as the material for the wall of the immersion tube (3) in question. The supply and discharge lines (4, 5) are provided for the inlet and outlet of nitrogen. It has been shown that the use of an inert gas between the UV lamp (2) and the outer wall of the dip tube (3) prevents the formation of undesirable gaseous by-products. The device according to the figure has on the inner wall of the reactor, which is preferably made of polished stainless steel, devices in the form of protuberances which lead to turbulent flows within the reactor. At higher flow rates, the devices can be omitted if the critical Reynolds number is exceeded.

Ein Vorteil des erfindungsgemäßen Verfahrens besteht da¬ rin, daß eine kontinuierliche Verfahrensführung zum Abbau von organischen Verbindungen, insbesondere Pflanzenschutz¬ mitteln wie Atrazin ermöglicht wird, ohne dabei oxidieren- de Substanzen wie H20, zur Rückoxidation des durch photo¬ chemische Reaktionen gebildeten Nitrits zu Nitrat anzu¬ setzen. Es ist zur Anwendung des erfindungsgemäßen Ver¬ fahrens möglich, bereits vorhandene Anlagen so umzurüsten, daß Wellenlängen des UV-Lichts von etwa 230 nm oder größer eingesetzt werden können. Dies ist in besonders einfacher Weise möglich durch Einsetzen der entsprechenden UV-Tauch¬ lampen oder Anordnungen von Filtern im Strahlengang, bei¬ spielsweise zwischen Tauchrohr und der zu behandelnden Flüssigkeit. Wird UV-Licht mit Wellenlängenanteilen kleiner 230 nm verwendet, kann das entstehende Nitrit nach der erfindungsgemäßen Verfahrensweise b) zerstört werden. An advantage of the process according to the invention is that continuous process control for the degradation of organic compounds, in particular crop protection agents such as atrazine, is made possible, without oxidizing substances such as H 2 O, for the re-oxidation of the nitrite formed by photo-chemical reactions to nitrate. To use the method according to the invention, it is possible to retrofit existing systems in such a way that wavelengths of UV light of approximately 230 nm or greater can be used. This is possible in a particularly simple manner by inserting the corresponding UV immersion lamps or arranging filters in the beam path, for example between the immersion tube and the liquid to be treated. If UV light with wavelength components smaller than 230 nm is used, the resulting nitrite can be destroyed by the procedure b) according to the invention.

Claims

_.P a t e n t a n s p r ü c h e _.P patent claims 1. Verfahren zur Aufbereitung von mit organischen Sub¬ stanzen belastetem Rohtrinkwasser, insbesondere von nitrathaltigem Rohtrinkwasser, das mit Pflanzen¬ schutzmitteln belastet ist durch Behandlung mit UV- Licht, dadurch gekennzeichnet, daß die Aufbereitung des Rohtrinkwassers entweder a) mit ultraviolettem Licht einer Wellenlänge > 230 nm erfolgt oder b) UV-Licht auch mit Anteilen kürzerer Wellenlänge als 230 nm in Verbindung mit Nitrit zerstörenden Sub¬ stanzen verwendet wird.1. Process for the treatment of raw drinking water contaminated with organic substances, in particular nitrate-containing raw drinking water which is contaminated with crop protection agents by treatment with UV light, characterized in that the treatment of the raw drinking water is either a) with ultraviolet light of a wavelength> 230 nm takes place or b) UV light is also used with portions of shorter wavelength than 230 nm in connection with nitrite-destroying substances. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Wellenlänge durch Verwendung eines Filters, der nur UV-Licht > 230 nm durchläßt, ausgewählt wird.2. The method according to claim 1, characterized in that the wavelength is selected by using a filter that only allows UV light> 230 nm. 3. Verfahren nach Anspruch 1 und/oder 2, dadurch ge¬ kennzeichnet, daß zur Erzeugung des ultravioletten Lichts eine Lampe verwendet wird, die zwar eine Emission im Bereich von 230 nm aufweist, jedoch we¬ nig UV-Licht mit Wellenlängen < 230 nm emitiert.3. The method according to claim 1 and / or 2, characterized ge indicates that a lamp is used to generate the ultraviolet light, which has an emission in the range of 230 nm, but little UV light with wavelengths <230 nm emitted. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß als Lampen UV-Tauchlampen (dotiert) der Fa. Heraeus ZI, Z2, Z3, Z4 oder allgemein Edelgas-Ent¬ ladungslampen verwendet werden.4. The method according to claim 3, characterized in that UV immersion lamps (doped) from Heraeus ZI, Z2, Z3, Z4 or generally noble gas discharge lamps are used as lamps. 5. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß als Filter solche aus Infralux M 235 der Fa. Heraeus verwendet werden.5. The method according to claim 2, characterized in that those made of Infralux M 235 from Heraeus are used as filters. 6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in der Verfahrensalternative b) als Nitrit zer¬ störende Substanzen organische Säuren oder deren 1-6. The method according to claim 1, characterized in that in the process alternative b) as nitrite zer¬ disruptive substances organic acids or their 1- Salze, Alkohole, reduzierend wirkende Hydroxyverbin- dungen, Ammoniak, Harnstoff sowie Aminderivate sowie deren Kombinationen verwendet werden.Salts, alcohols, reducing hydroxy compounds, ammonia, urea and amine derivatives and their combinations can be used. 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß Ameisensäure, Essigsäure, Zitronensäure, Wein¬ säure oder Salze dieser Säuren, Ethanol, Glucose und reduzierende Zucker, Amidosulfonsaure und deren Salze allein oder in Kombination verwendet werden.7. The method according to claim 6, characterized in that formic acid, acetic acid, citric acid, tartaric acid or salts of these acids, ethanol, glucose and reducing sugars, amidosulfonic acid and their salts are used alone or in combination. 8. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5, mit mindestens einer UV-Lampe, gegebenenfalls als UV-Tauchlampe ausge¬ staltet, einem durchströmten Reaktionsgefäß, das innen eine stark UV-Licht reflektierende Oberfläche besitzt und eine turbulente Strömung zu erzeugen vermag, dadurch gekennzeichnet, daß die UV-Lampe im wesentlichen UV-Licht einer Wellenlänge > 230 nm emittiert und/oder durch in den Strahlengang ge¬ schaltete Filtereinrichtungen UV-Licht der Wellen¬ länge > 230 nm erzeugt wird.8. Device for carrying out the method according to one of claims 1 to 5, with at least one UV lamp, optionally configured as a UV immersion lamp, a flow-through reaction vessel which has a highly UV-reflecting surface on the inside and a turbulent flow capable of generating, characterized in that the UV lamp emits essentially UV light of a wavelength> 230 nm and / or UV light of the wavelength> 230 nm is generated by filter devices connected in the beam path. 9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Filtereinrichtungen aus hochreinem Quarz¬ glas bestehen. 9. The device according to claim 8, characterized in that the filter devices consist of high-purity Quarz¬ glass.
EP92916380A 1991-07-26 1992-07-22 Method of processing untreated drinking water contaminated with organic substances Withdrawn EP0597928A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4124843 1991-07-26
DE4124843A DE4124843A1 (en) 1991-07-26 1991-07-26 Purifying raw drinking water loaded with organic matter - by exposure to long wave UV radiation
DE19924212604 DE4212604A1 (en) 1992-04-15 1992-04-15 Treating drinking water contg. organic substances esp. pesticides
DE4212604 1992-04-15
PCT/EP1992/001675 WO1993002965A1 (en) 1991-07-26 1992-07-22 Method of processing untreated drinking water contaminated with organic substances

Publications (1)

Publication Number Publication Date
EP0597928A1 true EP0597928A1 (en) 1994-05-25

Family

ID=25905858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92916380A Withdrawn EP0597928A1 (en) 1991-07-26 1992-07-22 Method of processing untreated drinking water contaminated with organic substances

Country Status (2)

Country Link
EP (1) EP0597928A1 (en)
WO (1) WO1993002965A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6440928B1 (en) 1988-12-06 2002-08-27 Colorado State University Research Foundation Method for treating diabetic neuropathy with NGF
DE4447035A1 (en) * 1994-12-28 1996-07-11 Eva Gotthold Method and apparatus for reducing the nitrate content of water
FR2729382B1 (en) * 1995-01-16 1997-03-28 Omnium Traitement Valorisa UV IRRADIATION REACTOR FOR THE TREATMENT OF LIQUIDS
US5847129A (en) * 1995-08-18 1998-12-08 Lenzing Aktiengesellschaft Process for the regeneration of an aqueous process liquid of the amine-oxide process
AT402512B (en) * 1995-08-18 1997-06-25 Chemiefaser Lenzing Ag METHOD FOR PROCESSING AN AQUEOUS PROCESS LIQUID OF THE AMINOXIDE METHOD
AT503799B1 (en) * 2006-07-26 2008-01-15 Vtu Engineering Planungs Und B PROCESS FOR REDUCING NITRATE

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144152A (en) * 1978-03-27 1979-03-13 Atlantic Research Corporation Dehalogenation of halogenated compounds
IT1216499B (en) * 1988-03-23 1990-03-08 Eniricerche Spa PHOTOCATALYTIC DEGRADATION PROCESS OF BENTAZONE.
DE3836850A1 (en) * 1988-10-28 1990-05-03 Guenther O Prof Dr Schenck Process and apparatus for purifying waters of oxidisable carbon compounds contained therein
DE3903549A1 (en) * 1989-02-07 1990-08-09 Int Biotech Lab UV light for the degradation of pollutants, in particular of halogenated hydrocarbons
DE9017684U1 (en) * 1990-08-08 1991-11-14 Ibl Umwelt- Und Biotechnik Gmbh, 6900 Heidelberg Device for carrying out photochemical reactions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9302965A1 *

Also Published As

Publication number Publication date
WO1993002965A1 (en) 1993-02-18

Similar Documents

Publication Publication Date Title
DE19517039C2 (en) Device for oxidative photopurification
EP0470518B2 (en) Device for carrying out photochemical reactions
DE4138421C2 (en) Process for reducing pollutants in water by means of hydrogen peroxide under UV irradiation
DE60001230T2 (en) METHOD AND REACTOR FOR DISINFECTING AND PURIFYING LIQUIDS AND GASES
DE69623133T2 (en) METHOD AND DEVICE FOR REMOVING IRON FROM AQUEOUS LIQUIDS
DE102004061253A1 (en) Device for treating a liquid or gaseous medium by means of UV rays
DD295142A5 (en) METHOD AND APPARATUS FOR TREATING FLUIDS LOADED WITH POLLUTANTS
DE69205658T2 (en) Process for the decomposition of organochlorine solvent in water.
DE4318676B4 (en) Process for reducing a particulate concentration in working fluids
EP0436922A2 (en) Method and apparatus for treating effluent
EP0333787A1 (en) Process and device for purifying liquids
DE4138916C2 (en) Modular construction device for the treatment of polluted aqueous liquids by means of UV radiation
EP0800481B1 (en) Process and device for reducing the nitrate content of water
EP0597928A1 (en) Method of processing untreated drinking water contaminated with organic substances
DE19838957A1 (en) Photo-oxidation device of a water treatment system for a manufacturing process for semiconductor devices, water treatment system and method for water treatment by the system
DE4307204C2 (en) Arrangement for cleaning liquids and / or gases
EP0508338A1 (en) Method and device for degrading organic contaminants by means of photolysis
DE3511919A1 (en) METHOD, MEANS AND DEVICE FOR GAS CLEANING
DE3903549A1 (en) UV light for the degradation of pollutants, in particular of halogenated hydrocarbons
EP1483063A1 (en) Method and device for the decontamination of optical surfaces
DE4124843A1 (en) Purifying raw drinking water loaded with organic matter - by exposure to long wave UV radiation
DE4212604A1 (en) Treating drinking water contg. organic substances esp. pesticides
EP0967202B1 (en) Photolysis of 7-dehydrocholesterol
WO2018087384A1 (en) Treatment of wastewater to obtain drinking water by means of ozone
DE69000660T2 (en) METHOD FOR THE HETEROGENIC CATALYTIC PHOTO-DECOMPOSITION OF POLLUTANTS.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19940202

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ULTRA SYSTEMS GMBH UV-OXIDATION

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ULTRA SYSTEMS GMBH UV-OXIDATION

18D Application deemed to be withdrawn

Effective date: 19960201