EP3645467A1

EP3645467A1 - Installation and method for water treatment

Info

Publication number: EP3645467A1
Application number: EP18735262.0A
Authority: EP
Inventors: Barbara BERSON
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-06-27
Filing date: 2018-06-27
Publication date: 2020-05-06
Also published as: US11267734B2; US20210139357A1; WO2019002389A1

Abstract

The present invention relates to a device and a method for treating raw water with ozone and ultraviolet radiation, comprising a reactor (4), which has first (5) and a second (6) reaction chamber. The first reaction chamber (5) has a UV lamp (1), an air inlet (30), and a gas outlet (23) for an air/ozone mixture (b). An air/ozone line (34) is connected to the gas outlet (23), via which line the air/ozone mixture (b) can be fed into the inlet line (31) for the water (d). The second reaction chamber (6) has an inlet line (31) for the water (d) and an outlet line (32) for the treated water. The inlet line (31) can contain a water filter (18). The inlet line (31) can contain a controllable recirculation pump (16) which is designed to pump water in the reactor direction, and the water filter (18) can be arranged between the controllable recirculation pump (16) and the reactor (4). A return line (33) is provided which has a pump (10) that pumps water in the direction of the inlet line (31). The return line has a feed point (21), at which the air-ozone mixture (b) can be fed into the water (d) or is fluidically connected via a fresh water feed point (9) to a fresh water line which has a feed point (21) at which the air-ozone mixture (b) can be fed into the fresh water (f).

Description

APPARATUS AND METHOD FOR WATER TREATMENT

TERRITORY

Disclosed are a plant and a process for water treatment. In particular, an improvement of a device for treating water by means of ultraviolet radiation having a wavelength of about 254 nanometers and at the same time having a wavelength of about 185 nanometers by means of a single illuminant is disclosed.

BACKGROUND

When using water, for example as part of a commercial process or when standing in a tank, produced hot water, which compared to the originally provided fresh or drinking water significantly more pollution in macroscopic form, in the form of microorganisms and / or in the form of low molecular weight chemical compounds, in particular organic compounds, but partially also inorganic salts. These compounds are often biologically heavy or non-degradable. Low molecular weight biologically heavy or non-degradable chemical compounds in the water are under the slogan "micropollutants" for more than ten years, national and international subject of technical and environmental policy debates (see, eg, the federal / state water consortium at http://wwwJawa.de/ documents / Uml24-2016_20160126_LAWA_Bericht_Mikroschadstoß ^ e_in _^ GewaessernJinal 207.pdf) The terms "micropollutants" or "micropollutants" are also used as synonyms for the term "micropollutants". Some of the organic compounds, even at very low concentrations, can have adverse effects on aquatic ecosystems and adversely affect the production of drinking water from raw water. These compounds include, for example, residues of biocides and pesticides, human and veterinary drugs, personal care products and household and industrial chemicals. As an illustrative example, when treating a public swimming pool with a depot disinfection, so-called disinfection by-products (DBPs) such as mono-, di- and trichloramines, which adversely affect the water quality and even endanger the health of the bather.

Service water, for example water in a pond or swimming pool as in a public swimming pool, is usually cleaned by means of a filter device and the addition of an oxidizing agent such as chlorine or hydrogen peroxide.

German patent application DE 101 29 663 discloses a process for the treatment of prepurified water by means of an ozone-enriched air stream, an activated carbon filter and UV irradiation.

A device and a corresponding method for water treatment, in which UV light and ozone are used, are known from the Internet site www.uvox.com/das-uvox-verfahren.html (Berson, B., Koikurier 52 (2007) , 2, 118-121).

The apparatus comprises a reactor having two reaction chambers, one for generating an air / ozone mixture, which is introduced into the water to be treated, and one for irradiating the water thus treated with UV light. Feeding the air / ozone mixture into the service Water takes place via an inlet point, for example a Venturi nozzle in a bypass branch of the feed line of the water to be treated. However, it would be desirable here to be more independent of pressure fluctuations in the main water circuit with respect to the suction of the air-ozone mixture (b) via the inlet point or the bypass branch with injection nozzle, in order to achieve a stable and for the application optimal suction capacity of the air. / Ozone mixture to ensure.

In addition, it would be desirable to avoid or minimize deposition and contamination on the outside of the quartz tube in order to always ensure optimum UV irradiation in the second reaction chamber of the reactor.

Also, it would be desirable to hydraulically and energetically optimize the system to the

To minimize consumption of energy, water and chemicals and to allow an early amortization of the plant.

Furthermore, it would be desirable to be able to control the operation and maintenance of the device at least partially.

SUMMARY

Disclosed is an apparatus for treating water, e.g. water contaminated with micro-organisms and water-soluble micro-contaminants, with ozone and ultraviolet radiation, and use of the water-treating device. Also revealed is a

Process for the treatment of water with ozone and ultraviolet radiation. The water to be treated contains or consists of process water.

The device contains a reactor containing a UV lamp. Connected to the reactor is an inlet line for the contaminated water. Furthermore, an outlet line for the treated, treated water is connected to the reactor. The reactor includes a first, inner, reaction chamber having a centered UV lamp and an air inlet. The first reaction chamber is traversed by air as it is exposed to the ultraviolet radiation of the UV lamp to form ozone. The reactor contains an outlet for the air / ozone mixture, to which an air / ozone line is connected. Through this air-ozone line, the air-ozone mixture is fed into the inlet line for the contaminated or reprocessed water. The reactor contains a second reaction chamber through which the water to be treated is flowed while exposed to the ultraviolet radiation of the UV lamp.

According to a first aspect, an apparatus for the treatment of service water with ozone and ultraviolet radiation is disclosed. The apparatus includes a reactor containing a first and a second reaction chamber, hereinafter also referred to as a first and a second reactor chamber. The first reaction chamber contains a UV lamp and an air inlet. The first reaction chamber also contains a gas outlet for an air / ozone mixture. The first

Air can flow through the reaction chamber, while this air can be exposed to ultraviolet radiation from the UV lamp to form ozone. To the second reaction chamber, an inlet pipe for the service water is connected. An outlet conduit for the treated, treated water is also connected to the second reaction chamber. The second reaction chamber is traversed by the water to be treated, while the treated water to be treated Ultraviolet radiation of the UV lamp can be exposed. To the gas outlet for the air-ozone mixture, an air / ozone line is connected, via which the air / ozone mixture can be fed into the inlet line for the process water. The inlet conduit is adapted to be coupled to a water filter and a circulation pump such that the water filter is disposed between the recirculation pump and the reactor. Furthermore, a return line is provided in the device for the partial recycling of the treated water from the outlet line to the inlet line. The return line includes a pump configured to pump water toward the inlet line. It contains in some embodiments, either the return line, a feed point at which the air / ozone mixture can be fed into the process water, or the return line is connected via a fresh water feed point with a fresh water line in fluid communication. In the latter case, the fresh water line may contain a feed point at which the air-ozone mixture can be fed into the fresh water. In some embodiments, both the return line and the fresh water line contain a feed point to which the air / ozone mixture can be fed.

In some embodiments, the inlet conduit includes the recirculation pump configured to

Pump water in the direction of the reactor. In some embodiments, the inlet conduit includes a water filter. In some embodiments, the inlet conduit includes both the recirculation pump and the water filter. The water filter is then arranged between the circulation pump and the reactor.

In some embodiments, a second circulating pump connected in parallel with the circulation pump is provided in the device, which is designed to pump water in the direction of the reactor. The second circulating pump is a controllable circulating pump. The second, controllable circulating pump is arranged in the flow direction in front of the water filter in a bypass branch of the inlet line. Between the circulation pump and the water filter, a check valve is arranged. Also between the second, adjustable circulation pump and the water filter, a check valve is arranged.

According to a second aspect, an apparatus for treating process water with ozone and ultraviolet radiation is disclosed. The apparatus includes a reactor containing a first and a second reaction chamber, hereinafter also referred to as a first and a second reactor chamber. The first reaction chamber contains a UV lamp and an air inlet. The first reaction chamber also contains a gas outlet for an air / ozone mixture. Air can flow through the first reaction chamber, while this air can be exposed to ultraviolet radiation from the UV lamp to form ozone. To the second reaction chamber, an inlet pipe for the service water is connected. To the second reaction chamber is also an outlet for the treated, treated, water connected. The second reaction chamber is traversed by the water to be treated, while the water to be treated, reprocessed, the ultraviolet radiation of the UV lamp can be exposed. The inlet pipe has a water filter. To the gas outlet for the air-ozone mixture, an air / ozone line is connected, via which the air / ozone mixture can be fed into the inlet line for the water to be treated. The

Inlet line includes a first circulation pump configured to pump water in the direction of the reactor. The water filter is disposed between the first circulation pump and the reactor. Furthermore, in the device, a second, parallel to the first circulating pump, circulating pump is provided, which is designed to pump water in the reactor direction. The second circulating pump is a controllable circulating pump. The second, controllable circulating pump is arranged in the flow direction in front of the water filter in a bypass branch of the inlet line. Between the first circulation pump and the water filter, a check valve is arranged. Also between the second, adjustable circulation pump and the water filter, a check valve is arranged.

In some embodiments, in the apparatus according to the second aspect, there is provided a return line for partially returning the treated treated water from the outlet line to the inlet line. The return line includes a pump configured to pump water toward the inlet line. It contains in some embodiments, either the return line, a feed point at which the air / ozone mixture can be fed into the process water, or the return line is connected via a fresh water feed point with a fresh water line in fluid communication. In the latter case, the fresh water line contains a feed point at which the air-ozone mixture can be fed into the fresh water. In some embodiments, both the return line and the fresh water line contain a feed point to which the air / ozone mixture is fed.

In some embodiments of the device according to the first or the second aspect, the second circulating pump connected in parallel with the first circulating pump is a frequency-controllable one

Circulation pump. In some embodiments of the device according to the first or the second aspect, the variable-frequency circulation pump is coupled to a controller. In some

Embodiments, the pump is frequency adjustable so that the suction power for the air / ozone mixture is constant.

In some embodiments of the device according to the first or the second aspect, the first circulating pump, which is arranged downstream of the water filter, is also controllable

Circulation pump.

In some embodiments of the device according to the first or the second aspect, in which the first circulating pump is a controllable circulating pump, such a controllable circulating pump is a variable-frequency circulating pump. In some embodiments of the device according to the first or the second aspect, the variable-frequency circulation pump is coupled to a controller. In some embodiments, the pump is frequency controlled such that the intake capacity for the air / ozone mixture is constant.

In some embodiments of the device according to the first or the second aspect, the return line contains a feed point at which the air / ozone mixture can be fed into the process water. In such embodiments, the pump is typically between the port of

Return line arranged on the outlet line and the feed point for the air / ozone mixture.

In some embodiments of the device according to the first or the second aspect, the return line contains the return line via a fresh water feed point with a fresh water line in fluid communication. In such embodiments, the fresh water line usually contains a feed point at which the air / ozone mixture can be fed into the fresh water. The pump is typically located in such embodiments between the connection of the return arranged on the outlet line and the fresh water feed point.

In some embodiments of the apparatus according to the first or the second aspect, the feed point for the air / ozone mixture is defined by a gas injector such as a nozzle. In some embodiments of the device according to the first or the second aspect, the feed point for the air / ozone mixture is defined by a Venturi nozzle.

In some embodiments of the device according to the first or the second aspect, the return line is connected via a connection to the inlet line, which is defined by a check valve or a non-return valve.

In some embodiments of the device according to the first or the second aspect, the return line is connected via a connection to the inlet line. The water filter is in such embodiments usually arranged in the inlet line in the flow direction in front of this port.

In some embodiments of the apparatus according to the first or the second aspect, the reactor further includes an inlet for a conduit for supplying chemicals such as H ₂ O ₂ , hydrochloric acid, citric acid or the like from a container with a metering pump.

In some embodiments of the device according to the first or the second aspect, the pump in the return line is a controllable pump. In some embodiments, the pump in the return line is a frequency-controlled pump.

In some embodiments of the device according to the first or the second aspect, the container is designed as a container with metering lance and level controller.

In some embodiments of the device according to the first or the second aspect, the inlet line includes a pressure sensor. In some embodiments of the device according to the first or the second aspect, the return line includes a pressure sensor.

In some embodiments of the device according to the first or the second aspect, the second reaction chamber includes a temperature sensor.

In some embodiments of the device according to the first or the second aspect, the second reaction chamber contains a UV sensor.

In some embodiments of the device according to the first or the second aspect, the controllable circulating pump can be regulated by means of values that can be output by the pressure sensor. In some embodiments of the device according to the first or the second aspect, the controllable circulating pump is controllable by means of values that can be output by such a pressure sensor. In some embodiments of the device according to the first or the second aspect, the controllable circulating pump is controllable by means of values that can be output by the temperature sensor. In some embodiments of the device according to the first or the second aspect, the circulation pump or by means of values can be regulated, which can be output by the UV sensor. In some embodiments, the recirculation pump is controllable by both values that can be output by the UV sensor and regulated by values provided by the UV sensor

Temperature sensor can be output.

In some embodiments of the device according to the first or the second aspect, the air inlet of the first reaction chamber is controllable. In some embodiments of the apparatus according to the first or the second aspect, the air inlet of the first reaction chamber is coupled to an air supply regulator. As previously explained, the inlet conduit may include a pressure sensor. Also, the return line may include a pressure sensor. The second reaction chamber may also include a temperature sensor adjacent thereto. Thus, in some embodiments, the air inlet may be controlled by the values output by such a pressure sensor. In some embodiments, the air inlet is controllable by the values that can be output by the temperature sensor. In some embodiments, the air inlet is controllable by the values that can be output by the UV sensor. In some

Embodiments, the air inlet is controllable both by means of values which can be output by the UV sensor and by means of values which can be output by the temperature sensor.

In some embodiments of the device according to the first or the second aspect, the return line is connected via a connection to the inlet line and the water filter is arranged in the inlet line in the flow direction before this connection.

As already explained above, the pump in the return line can be a controllable pump. In some embodiments of the device according to the first or the second aspect, the pump in the return line is frequency adjustable so that the suction power for the air / ozone mixture is substantially constant. In some embodiments of the device according to the first or the second aspect, the pump in the return line is frequency adjustable so that the suction power for the air / ozone mixture is constant.

In some embodiments of the device according to the first or the second aspect, the air inlet of the first reaction chamber is controllable such that the suction power for the air / ozone mixture is adaptable to the flow rate of water through the second reaction chamber of the reactor. In some embodiments of the device according to the first or the second aspect, the air inlet of the first reaction chamber is adjustable so that the amount of injected air / ozone mixture per predefined amount of water is constant.

In some embodiments of the device according to the first or the second aspect, no filter is included in the reactor of the device. In some embodiments, the reactor of the device does not contain an activated carbon filter. In some embodiments, the device does not include an activated carbon filter. In some embodiments, in the reactor of the device is no

Photocatalyst such as titanium dioxide present. In some embodiments, the device does not contain a photocatalyst such as titanium dioxide.

According to a third aspect, there is disclosed a use of a device according to the first or the second aspect for the continuous treatment of service water with ozone and ultraviolet radiation. In this use, the inlet conduit includes a recirculation pump configured to pump water in the direction of the reactor. The water filter is arranged in this use between the circulation pump and the reactor. In use, process water is pumped via the inlet line into the reactor by means of the circulation pump. In addition, air flowing through in the first reaction chamber of the reactor is exposed to the formation of ozone in relation to the ultraviolet radiation of the UV lamp. In use, also in the second reaction chamber of the reactor flowing through, enriched with an air / ozone mixture, process water exposed to the ultraviolet radiation of the UV lamp. Furthermore, the treated water is partially recycled to the process water and fed the resulting air / ozone mixture in the recirculated treated water. The feeding of the air / ozone mixture in the recycled water takes place before the recycled water is supplied to the process water. The pressure of the returned water is increased by means of the pump in the return line.

In some embodiments, the air / ozone mixture is fed directly into the recycle treated water in the recycle line for the partial recirculation of the treated, treated water. In some embodiments, fresh water is also fed via a fresh water feed point with a fresh water line in the return line. In such

Embodiments, the air / ozone mixture can also be fed into the fresh water.

In some embodiments, service water is pumped into the reactor via the bypass branch and the inlet line by means of the second variable circulation pump connected in parallel to the circulation pump.

According to a fourth aspect, there is disclosed a use of a device according to the first or second aspect for the continuous treatment of service water with ozone and ultraviolet radiation. In this use, the inlet conduit includes a recirculation pump configured to pump water in the direction of the reactor. The water filter is arranged in this use between the circulation pump and the reactor. In use, process water is pumped via the inlet line into the reactor by means of the circulation pump. It is also exposed in the first reaction chamber of the reactor flowing through air to form ozone to the ultraviolet radiation of the UV lamp. In use, also in the second reaction chamber of the reactor flowing through, enriched with an air / ozone mixture, hot water is exposed to the ultraviolet radiation of the UV lamp. Furthermore, service water is pumped via the bypass branch and the inlet line into the reactor by means of the second, adjustable circulating pump connected in parallel to the circulating pump.

In some embodiments, the treated water is partially recycled to the process water and the resulting air / ozone mixture is fed to the recycled treated water. The feeding of the air / ozone mixture into the recirculated water takes place before the recirculated water is supplied to the process water. The pressure of the returned water is increased by means of the pump in the return line.

In some embodiments, the air / ozone mixture is fed directly into the recycle treated water in the recycle line for partially recycling the treated water. In some embodiments, fresh water is also fed via a fresh water feed point with a fresh water line in the return line. In such embodiments, the air / ozone mixture may also be fed into the fresh water.

The service water can be contaminated with germs and / or loaded with low molecular weight organic compounds and / or salts.

According to a fifth aspect, there is disclosed a method of treating process water with ozone and ultraviolet radiation by the apparatus of the first or second aspect. In this method, the inlet line includes a circulating pump configured to carry water in Pump reactor direction. The water filter is arranged in this method between the circulation pump and the reactor. The procedure involves pumping process water into the reactor via the inlet line by means of a circulating pump. The method further involves allowing air to flow through the reactor's first reaction chamber while exposing that air to ultraviolet radiation from the UV lamp to form ozone.

The process involves feeding the resulting air / ozone mixture into the process water or water to be treated. For the method it is in some embodiments, to feed the resulting air-ozone mixture directly into the water to be treated. In some embodiments, the process involves adding further water to the process water, into which the resulting air / ozone mixture is fed.

Furthermore, it is part of the process to partially return the treated water to the process water. The process also involves feeding the air / ozone mixture into the recirculated water and increasing the pressure in the recirculated water by means of a pump.

In some embodiments, it is part of the process to pump the service water into the reactor via the bypass branch and the inlet line by means of the second variable circulation pump connected in parallel to the circulation pump.

According to a sixth aspect, a method of treating process water with ozone and ultraviolet radiation by means of the apparatus of the first or second aspect is disclosed. In this method, the inlet conduit includes a recirculation pump configured to pump water in the direction of the reactor. The water filter is arranged in this method between the circulation pump and the reactor. The procedure involves pumping process water into the reactor via the inlet line by means of a circulating pump. The method further involves allowing air to flow through the reactor's first reaction chamber while exposing that air to ultraviolet radiation from the UV lamp to form ozone. The procedure also includes feeding the resulting air / ozone mixture into the water to be treated. It counts too

Method to pump the process water via the bypass branch and the inlet line in the reactor by means of the second, adjustable circulating pump connected in parallel to the circulation pump.

In some embodiments, it is part of the process to feed the resulting air / ozone mixture into the water to be treated. For the method, it is in some embodiments to feed the resulting air / ozone mixture directly into the process water. In some embodiments, the process involves adding further water to the process water, into which the resulting air / ozone mixture is fed. In some embodiments, in which the resulting air / ozone mixture is fed into the service water, it is part of the process to return the treated water partly in the process water. The method may also include feeding the air / ozone mixture into the recirculated water and increasing the pressure in the recirculated water by means of a pump.

The summary described above is not limiting and other features and advantages of the device described herein should be apparent from the following detailed description, the drawings and the claims. DESCRIPTION OF THE DRAWINGS

Fig. 1 shows a schematic flow diagram based on a known plant for the treatment of process water.

FIG. 2 is a schematic flow diagram of one embodiment of the invention disclosed herein. FIG

Device.

3 shows a schematic flow diagram of another embodiment of the device disclosed herein.

4 shows a schematic flow diagram of another embodiment of the device disclosed herein.

Fig. 5 shows a control of a device disclosed herein with reference to the embodiment shown in Fig. 2.

Fig. 6 shows the device in one embodiment with a control (214).

Fig. 7 shows the measuring arrangement when collecting measurement data by means of the device.

Fig. 8 shows the effect of the device on E. coli.

Figures 9A and 9B show the effect of the device on B. subtilis spores.

Figures 10A and 10B show the effect of two differently configured devices on B. subtilis spores.

DETAILED DESCRIPTION

The term "consisting of" as used in this document means inclusive and limited to what follows the term "consisting of". The term "consisting of" thus indicates that listed elements are necessary or necessary, and that no other elements may be present, and the term "consisting essentially of" is understood to mean that any elements disclosed in US Pat Expression are included, and that other elements may be present, for example in a sample or a composition, that do not alter the activity or effect indicated for the elements concerned in this document, and thus do not interfere with it contribute. In other words, the term "consisting essentially of" indicates that the defined elements are necessary or required, but that other elements are optional and may or may not be present, depending on whether they are relevant to the effect or effectiveness of the defined elements are or not.

The term "beneficiation", as used herein in reference to water, means to improve water for consumption, for example, as drinking water or for use in a pond or swimming pool, by depleting or removing contaminants.

The term "service water" refers to water that, compared to fresh or drinking water that meets regulatory requirements in Europe or the US, significantly more contamination in the form of microorganisms and / or in the form of low molecular weight organic compounds. Process water can also contain significantly increased amounts of inorganic salts. Process water can also contain macroscopic impurities. Significantly increased in terms of water, when used herein, means that drinking water quality regulations for at least one contaminant are exceeded.

The word "about" when used herein refers to a value that is within an acceptable error range for a particular value as determined by one of ordinary skill in the art, depending in part on how the particular value is determined or measured For example, "approximately" may mean within a standard deviation of 1 or more, depending on use in the particular area. The term "about" is also used to indicate that the amount or value may be the designated value or another value that is approximately equal, and the term is intended to express that similar values have equivalent results or effects as disclosed in this document. In this context, "about" may refer to a range of up to 10% above and / or below a certain value. In some embodiments, "about" refers to a range of up to 5% above and / or below a certain value, such as about 2% above and / or below a certain value. In some embodiments, "about" refers to a range of up to 1% above and / or below a certain value. In some embodiments, "about" refers to a range of up to 0.5% above and / or below a certain value In one embodiment, "about" refers to a range of up to 0.1% above and / or below a certain value.

The term "water filter" refers to an element comprising a material through which water can pass, such as sand, a gravel bed, ion exchange material, activated carbon, a porous polymer, e.g.

Polymer foam or a polymer fleece ("filter cotton"), sintered glass beads ("activated glass") or a membrane such as an ultrafiltration membrane and thus physically acts as a sieve. Typically, a water filter is dimensioned and designed such that water flowing through it has a certain minimum residence time, for example a few seconds, for contact with the material acting as a sieve, at a maximum permissible flow rate in the system. A water filter can be a conventional drinking water filter. It exists

Regulations for drinking water filters that are intended to have certain health-related

To reduce pollutants in the public or private water supply. A water filter can contain a material that allows the colonization of microorganisms. In this way, in addition to the filtration of coarse or fine suspended particles and the biodegradation of toxic waste by microorganisms is made possible.

The terms "before" and "after" refer to the direction of flow of water in a device disclosed herein. The presence of a circulating pump gives, for example

Direction of flow in an inlet line in the direction of the reactor before. As another example, the presence of a pump in a return line predicts a flow direction in this line from an outlet line of the reactor toward an inlet line of the reactor.

The conjunctive expression "and / or" between multiple elements, as used herein, is understood to encompass both individual and combined options, for example, if two elements are linked by "and / or", a first option involves the use of the first Elements without the second. A second option concerns the use of the second element without the first one. A third option involves the use of the first and second elements together. It is understood that any one of these options falls within the meaning of the term and thus meets the terms of the term "and / or" as used in this document.

Singular forms such as "a", "a", "the", "the" or "the" include the plural form when used in this document, for example, a reference to "a cell" refers to both an individual cell and a plurality of cells. In some cases, the term "one or more" is used explicitly to indicate that the singular form includes the plural form, and such explicit hints do not limit the general meaning of the singular form

"At least", "at least" and "at least", when preceded by a sequence of elements, are understood to refer to each of these elements. The terms "at least one," "at least one," "at least one "or" at least one of "includes, for example, one, two, three, four or more elements.

Since the device disclosed here is based on the already known device from Berson (2007, supra), the principle of water treatment, which is the basis of the device disclosed here, will first be explained with reference to this device. These explanations apply above all to the device disclosed here and, in the context of the explanations, features and embodiments are also addressed which in this form are not part of the already known ones

Device are.

The known device comprises a cylindrical reactor containing a first inner and a second outer reaction chamber. The first inner reaction chamber includes an inlet side with an air inlet. The inlet side may further include a lid, an air filter and a mounting plate. The first inner reaction chamber further contains a radiation source for UV radiation, here referred to as a UV lamp. This radiation source is within a UV transmissive, e.g. transparent, surrounding wall arranged. The circumferential UV radiation transmissive wall is typically a quartz tube. The device disclosed herein typically contains a radiation source only at a central position in the reactor. These

Radiation source can be composed of several individual radiation sources, but defined in the device disclosed here, typically the only radiation source.

Air passes through the first inner reaction chamber as it is exposed to the ultraviolet radiation of the UV lamp with a wavelength of about 185 nanometers to produce ozone from oxygen. The reactor contains an outlet for the formed air / ozone mixture, which is connected to an air / ozone line. By means of this air / ozone line, the air / ozone mixture is fed via an inlet point, for example a Venturi nozzle, into the inlet line for the water to be treated. In this case, the feed takes place in a bypass branch of the inlet line for the water to be treated.

The second, outer reaction chamber of the reactor contains an inlet pipe connected to the reactor for the water to be treated and the air / ozone mixture already fed into this reactor. The water to be treated consists of service water or at least contains hot water. This second reaction chamber is flowed through by the water to be treated, while it is exposed to the ultraviolet radiation of the UV lamp with only a wavelength range of about 250 to 260 nm, typically a wavelength of about 254 nanometers, and is thus disinfected. The ongoing process includes the "extended oxidation" described below and is based on the one hand on the effect of the existing ozone, on the other to the effect of UV radiation and also on in situ formed reaction products, which in the

Exposure of UV radiation to ozone occurs. The reactor also contains a

connected outlet pipe for the treated process water.

Ozone is an allotrope of the oxygen of the formula O ₃ , which is formed by the action of UV light from oxygen. Ozone molecules rapidly decompose to biatomic oxygen in the dark 0 ₂ . Ozone is a powerful oxidant capable of killing microorganisms and degrading low molecular weight compounds. UV ozone generators usually use ultraviolet light of as narrow a wavelength range as possible to form O ₃ . One revealed here

The device uses ultraviolet light of a very narrow wavelength range, typically about 185 nm, to form O ₃ . In addition, it sets light of a second very narrow

Wavelength range, typically about 254 nm, to directly irradiate water.

With the help of UV light, among other things effectively microorganisms are killed in the second reaction chamber. It has been observed that the simultaneous introduction of the ozone / oxygen mixture into water to be treated and the irradiation of this water to be treated with UV light at 254 nanometers is suitable for in situ dissolved and dispersed contaminants ("micropollutants", see above) as well as microbiological The decomposition of ozone in water, when exposed to UV light, leads to the reaction with water molecules and OH ^" ions, which leads to the intermediate formation of OH radicals and Η ₂ 0 ₂ . Corresponding reactions take place in the presence of water vapor in the troposphere.

The oxidation with the help of ozone and hydrogen peroxide or an additional combination with UV irradiation (UV oxidation) is also known in professional circles as "advanced oxidation processes".

The intermediary generation of OH radicals is considered to play a key role here, since these highly reactive and extremely unstable reaction intermediates react with virtually any available compound virtually at the moment of their formation, with the appearance of these radicals in water is explained that each existing in the water connection can be oxidized by the combination of UV radiation and ozone almost, often with a diffusion-controlled reaction rate. the degraded low molecular weight compounds ( "Mikropollutants", see above) are thereby largely up to C0 _2, Water and salts mined. An overview of the fundamental work involved in the study of processes that characterize the process known as AOP has been reviewed in a review by Andreozzi et al. (Andreozzi, R., et al., Catalysis Today 53 (1999) 51-59). It also deals with the molecular processes involved in the action of UV radiation on an ozone / water system.

For a device based on the device disclosed herein (Berson et al., 2007), it has been demonstrated that by its anti-microbial effect, for example, the use of

Residual disinfectant in swimming pools can be reduced and existing in the water low molecular weight organic compounds such as disinfection by-products are reduced (http://www.demeaumed.eu/index^hp/diss/news/65-results-of-the-greywater-tech

demonstration-site). It was further demonstrated that the presence of ozone increased the inactivation of B. subtilis spores.

A device disclosed herein allows a continuous feed of higher amounts of ozone into the reactor compared to the known device (see above), without having to supply the very unstable ozone to the device from an external source. In this way, an improved oxidation effect is achieved. In particular, an increased formation of OH radicals in the second reaction chamber of the reactor is achieved. A device disclosed herein for treating process water with ozone and ultraviolet radiation includes a reactor containing a UV lamp. In some embodiments, the reactor is comprised of a circumferential wall having first and second reaction chambers, an air inlet side, and a base.

In some embodiments, the circumferential wall of the reactor does not contain an interior surface facing the interior of the reactor which reflects UV radiation. In some embodiments, the peripheral wall of the reactor does not include a radiant reflective interior surface facing the interior of the reactor.

To the reactor, an inlet pipe for the service water or the water to be treated is connected. To the reactor is further connected an outlet line for the treated water. The reactor contains a first and a second reaction chamber. The first reaction chamber contains an air inlet. The air inlet may be provided with an air filter or coupled to an air filter. Air can flow through the first reaction chamber, while this ultraviolet radiation of the UV lamp can be exposed to form ozone. The second reaction chamber is traversed by the water to be treated, while it is exposed to the ultraviolet radiation of the UV lamp. The reactor also contains an outlet for the air / ozone mixture. An air / ozone line is connected to the outlet for the air / ozone mixture, through which the air / - ozone mixture can be fed into the inlet line for the water to be treated.

The feeding of the air / ozone mixture can be done by a gas injector such as an injector coupled to an injection pump. This may be a nozzle, e.g. executed as a gas injection nozzle. Gas injectors are commercially available, for example, from Fortrans (NC, USA) or Bauer (Munich, DE).

Next to the reactor, the device is configured for coupling to a water filter. In some embodiments, the device includes a water filter that acts primarily as a mechanical screen. For example, macroscopic contamination, including algae or leaves for example, are retained by the filter, and deposits of the filter material are formed over time due to bacterial growth. As a result, the permeability of the water filter decreases. Thus, an ever increasing pressure would have to be built up to achieve a continuous flow rate through the water filter. After a filter cleaning or replacement of the filter material, however, the permeability of the Water filter abruptly.

As a result, with constant pumping power, the line pressure in a device containing only a reactor, an air / ozone feed, a recirculation pump and a water filter would be subject to severe fluctuations. The consequences of these fluctuations can not be compensated with a stopcock such as a ball valve shown in Fig. 1, especially since such a stopcock can be changed only between the states "open" and "closed". The ball valve is connected in parallel with the feed for the air / ozone mixture by providing a bypass branch. One branch of this bypass branch contains the

Inlet for the air / ozone mixture, while the other branch contains the ball valve. By opening or closing the ball valve, however, the flow of filtered process water can be changed, into which the air / ozone mixture is fed.

With embodiments of a device disclosed here, in contrast, in

Generate substantially constant flow of water, in which on the one hand, the air / ozone mixture is fed and the other flows through the second reaction chamber of the reactor.

In one embodiment, a return line is provided with a pump adapted to supply treated water to the filtered water to be treated, as illustrated in FIG. The return line can be regarded as a return loop. It establishes a connection between the outlet line of the reactor and the inlet line of the reactor. Surprisingly, it has been observed that only one element is to be provided, which in this recirculation loop provides for flow from the outlet line of the reactor towards the inlet line of the reactor. In this way, undesired flow directions in the return line or return loop are prevented and a substantially constant flow of water is possible, which is enriched with the air / ozone mixture. For this purpose, a pump is provided, which is designed to pump water in the direction of the inlet line of the reactor. The pump can be a controllable pump. In this way, fluctuations in the pressure can be compensated, which can occur in particular in the inlet line of the reactor.

In such embodiments, therefore, a return line for the partial return of the treated water from the outlet to the inlet pipe is provided. This return line can contain a feed point to which the air / ozone mixture can be fed. The

Return line also contains a pump.

Depending on whether the system to be watered up is a closed system such as a basin or a container, or an open system such as a water supply from a polluted water source, there may also be one

Infeed of fresh water into the device disclosed here are integrated. The feed of fresh water is typically in the return line, which is adapted to supply treated water to the filtered, reprocessed water. As illustrated in Fig. 3, in such a case, the supply of the air / ozone mixture in a corresponding

Fresh water supply take place. Such a fresh water supply typically contains a A pump adapted to pump water towards the inlet line of the reactor

In one embodiment, a substantially constant flow of water can be generated by means of a second, adjustable circulating pump connected in parallel to the circulating pump. The air / ozone mixture can be fed in a return line with a pump or in a bypass branch, where it is connected in parallel to a flow control element such as a stopcock. The air / ozone mixture can also be fed into an additional fresh water supply, as previously stated.

Both the first circulation pump and the second, controllable circulating pump are configured so that they pump water in the direction of the water filter, and thus the reactor. In this way, on the one hand, if necessary, build up an increased pressure on the water filter. On the other hand, the additional pressure on the water filter can be regulated. By a non-return valve, which is arranged in the two parallel arms of bypass diversion and inlet line between the corresponding circulation pump and the water filter, it can be prevented that there is an uncontrolled backward flow.

In some embodiments of the device disclosed herein, a return line is provided for partially returning the treated water from the outlet line to the inlet line. This return line contains a feed point to which the air / ozone mixture can be fed. The return line contains a pump. The feed point to which the air / ozone mixture is added is typically located downstream of the pump. In other words, the pump is typically arranged between the connection of the return line to the outlet line and the feed point. The feed point is typically arranged between the pump and the connection of the return line to the inlet line. A check valve may be disposed at the inlet of the return line in the inlet line.

In some embodiments, the first reaction chamber is cylindrical. In some embodiments, the second reaction chamber is concentric. The second reaction chamber may, for example, have the shape of a hollow cylinder. The center of the hollow cylinder may, in some embodiments, be defined by the first reaction chamber. For example, in cross section, the first and second reaction chambers may define concentric circles, of which the second reaction chamber defines an outer circle relative to the first one

Reaction chamber defines an inner circle. The reactor in such embodiments may define in cross-section a circle in which the first and second reaction chambers define two concentric circles, of which the first reaction chamber defines an inner concentric circle. The UV lamp in such embodiments may define, in cross-section, the center of the reactor about which the concentric circles defining the first and second reaction chambers are disposed.

In some embodiments, the pump is disposed between the connection of the return line to the outlet line and the feed point for the air / ozone mixture.

In some embodiments, the feed point is formed as a Venturi nozzle. In some embodiments, the return line is connected to the inlet line via a check valve.

In some embodiments, a return is provided for partially recycling the treated water from the outlet line to the inlet line of the prefiltered service water. This return line may contain an additional feed for fresh water. Further, the recirculation may include a pump followed by a feed point to which the air / ozone mixture is added. Also, the return may include a non-return valve.

In some embodiments, the reactor at the bottom of the second reaction chamber includes a port for a supply of chemical feed. This connection can be arranged, for example, in the base of the reactor in the second reaction chamber. This connection can also be arranged in a lateral wall, for example a circumferential wall of the reactor in the second reaction chamber. For example, the port in a lateral wall of the reactor may be adjacent to the base, including adjacent to the base, in the second reaction chamber. In some embodiments, the reactor includes a connection for a conduit for supplying chemicals such as H ₂ O ₂ , hydrochloric acid, citric acid or the like from a container with a metering pump. In some embodiments, the reactor in the base or in the vicinity of the base, for example in a lateral wall, of the second reaction chamber contains an inlet for a feed line for supplying chemicals such as hydrogen peroxide, hydrochloric acid, citric acid or the like. from a container with a metering pump.

In some embodiments, the pressure increase pump is between the port of

Return line arranged on the outlet line and the feed point for the air / ozone mixture. In some embodiments, the feed point is formed as a Venturi nozzle. In some embodiments, the return line is connected to the inlet line via a check valve.

In some embodiments, the inlet conduit includes upstream of the inlet conduit

Feed point for the air / ozone mixture a water filter. In some embodiments, the inlet line between the recirculation pump and the air / ozone mixture feed point includes a water filter. In some embodiments, the pressure increase pump is frequency controllable, so that the suction performance for the air / ozone mixture is substantially constant. In some embodiments, the pressure increase pump is frequency controllable such that the

Suction capacity for the air / ozone mixture is constant. In some embodiments, the feed of the air / ozone mixture takes place in the return line of the already treated by the reactor water. In some embodiments, the fresh water feed takes place before the feed of the air / ozone mixture and only then is the resulting mixture fed to the second reactor chamber of the reactor. In some embodiments, the pump provides the required pressure increase for the supply of the air / ozone mixture and for the supply of fresh water before connecting the reactor for water to be treated. In some

Embodiments, the feed point for the ozone / air mixture is designed as an injection element, for example as a Venturi nozzle. In some embodiments, the pump is so Frequency-controlled, that the intake power for the air / ozone mixture is at least substantially constant and this can be optimized for the application. In some embodiments, the return line is connected to the inlet line via a check valve.

In some embodiments, the pump is configured as a frequency-controlled pump or booster pump. In some embodiments, the container is designed as a container with metering lance and level controller. In some embodiments, the check valve is as

Non-return valve formed.

In some embodiments, the venturi nozzle is disposed in the return line of the already processed process water. In some embodiments, the fresh water feed is located prior to the feed of the air / ozone mixture. In some embodiments, the pump is designed as a frequency-controlled pump. In some embodiments, the venturi is equipped with a pressure sensor, for example equipped with one or two pressure gauges. In this case, the pressure difference in the line, for example in the return line upstream and downstream of the Venturi nozzle can be determined. For sensors included in the device disclosed herein, any type of signal transmission, whether wireless or wired, is generally suitable. The pressure sensors can each be coupled to a transmitter. In some embodiments, a closed-loop control for the frequency-controlled pump is provided based on a determined pressure difference.

In some embodiments, the container includes a metering lance and level controllers and

Metering pump. In some embodiments, a check valve is present.

In some embodiments, the flow of air into the first reaction chamber of the reactor and the flow of water into the second reaction chamber of the reactor can be controlled with the aid of regulators. Thus, the air inlet of the reactor can be regulated. Likewise, an existing pump can be regulated. For controlling the flow of air or water, one or more sensors may be provided in the device. Thus, a UV sensor can be arranged in the interior of the first and / or the second reaction chamber. Also, in the interior of the second reaction chamber, a temperature sensor may be arranged. In some embodiments, in the

Be arranged adjacent to the feed point for the air / ozone mixture one or more pressure sensors. For example, the feed point for the air / ozone mixture can be arranged between two pressure sensors.

For example, the power of an existing pump can be regulated with the aid of the values of the individual sensors. Thus, with the aid of the pumping power, a specific temperature such as a temperature in the range of 16 ° C to 24 ° C or in the range of 25 ° C to 38 ° C in the second reaction chamber of the reactor can be adjusted. A corresponding temperature range may also be in the range of about 30 ° C to about 37 ° C.

A device disclosed herein may be used to treat water, including microorganisms and micro-pollutants, especially low molecular weight organic compounds

Impurities contaminated water, can be used. Such water is here as Called domestic hot water. In a corresponding method disclosed herein, the irradiation of air is by means of ultraviolet radiation having a wavelength of about 185 nanometers. At the same time, the irradiation of process water by means of ultraviolet radiation with a wavelength of about 254 nanometers takes place at the same time. In such a use and method, a device described herein is used. One of the purposes of the process is to allow air to flow through the first reaction chamber of the reactor as it is exposed to ultraviolet radiation having a wavelength of about 185 nanometers from the UV lamp to produce ozone from oxygen.

In some embodiments, the UV lamp is comprised of a plurality of individual UV lamps. Each of these plurality of UV lamps can be arranged inside a first reaction chamber and be surrounded, for example, by a quartz tube. Each of these plurality of UV lamps may be disposed inside a first reaction chamber, each containing an outlet for the air-ZOzon mixture and is coupled to a gas line. In some embodiments, the reactor includes two or more centrally located UV lamps, for example, four or more centrally located UV lamps. The choice of the UV lamp and the dimensions of the reactor depends on the purpose and volumes of the desired use. In some embodiments, the UV lamp (s) are selected to provide UV dosage in the range of about 5 to 100 mJ / m ² in the second reaction chamber, including in the range of about 20 to 50 mJ / m ² . In some embodiments, the UV lamp (s) are selected to provide in the second reaction chamber a UV dosage in the range of about 5 to 30 mJ / m ² , for example a UV dosage in the range of about 12.5 to about 50 mJ / m ² . In some embodiments, the or a UV lamp of the reactor emits light with a power consumption of about 140 to 250 watts, including about 180 to 200 watts, at a recirculation and water temperature between 26 ° C to 37 ° C. The respective dosage of UV light is among others

depending on the turbidity of the water to be treated and on the turnover of the

water to be worked up in the second reaction chamber in m ³ per hour. The dosage, in particular a minimum dosage, also depends on the type and nature of the existing and degradable micro-contaminants.

For the use disclosed here or for the method disclosed here, it is also important to feed the air / ozone mixture into the return line for partial recycling of the already processed process water or into the fresh water supplied here. Furthermore, it is the use or method to feed the thus obtained to an air / ozone mixture enriched mixture of fresh water and purified process water before the second reaction chamber of the reactor in the feed line for water to be treated. The second reaction chamber is flowed through by a mixture of treated process water, fresh water and process water, which is enriched with the air / ozone mixture. For use or for the method, it is important to expose this mixture in the second reaction chamber to ultraviolet radiation of the UV lamp with a wavelength of about 254 nanometers. The mixture is disinfected in this way.

UV light of about 254 nm, which is in the so-called UV-C range, is absorbed by nucleic acids, which subsequently leads to the reaction and destruction of nucleic acids and thus to the killing of microorganisms. UV light of 254 nm can be generated by a low pressure mercury vapor lamp. For use or for the method, it is further important to expose air of an ultraviolet radiation of the UV lamp with a wavelength of about 185 nanometers in the first reaction chamber. Even UV light of 185 nm can be generated by a low-pressure mercury vapor lamp. It can be used in both cases, the same low-pressure mercury vapor lamp.

In some embodiments, the feed of the air / ozone mixture is effected by means of an injection device, such as a gas nozzle.

In some embodiments, a controllable pump is used, for example, a frequency-controlled pump. In this way, a particularly stable and optimal for the application

Suction capacity of the air / ozone mixture allows. As an illustrative example, the pump may be a centrifugal pump. Using a frequency converter or a frequency converter, the speed of the pump can be set for the required pump power.

In some embodiments, the feed of the air / ozone mixture is by means of a

Combination of a Venturi nozzle and a frequency-controlled pump.

In some embodiments, it is one of the purposes and methods of feeding chemicals to the bottom of the second reaction chamber of the reactor. These chemicals may be selected to inhibit deposits such as e.g. Lime deposits on the outside of the quartz tube to dissolve, so as to ensure a constant and optimal UV radiation in the second reaction chamber. As a chemical, an additional oxidizing agent, such as hydrogen peroxide, can also be introduced into the reaction chamber to increase the concentration of oxidizing agents. In this way, the processes of the Advanced Oxidation Process (AOP) explained above can also be increased.

In some embodiments, these system components are integrated into a compact system and can be automated, which facilitates operation and maintenance of the device.

In some embodiments, a device disclosed herein includes a ball valve for opening or closing the flow of water through a conduit. For example, a ball valve may be arranged in the inlet line. A ball valve may also be arranged in the outlet line. The corresponding opening or closing of the water flow can, for example, be automated, for example in order to carry out a cleaning step. In some embodiments, a device disclosed herein includes two ball valves, which may be automatically opened and closed, for example.

In some embodiments, a device disclosed herein includes a container. This container may contain a metering lance and a level controller. In some embodiments, the container may be coupled to the reactor by means of a metering pump. Such a metering pump can be controlled automatically, for example. The reactor may include an additional outlet in some embodiments. For example, this additional outlet may be controllably opened and closed. The additional outlet is a tap in some embodiments. In In some embodiments, a device disclosed herein includes a frequency controlled pump. This pump can be controllable. In some embodiments, one disclosed herein

Device, a frequency-controlled metering pump, which may be controllable, for example.

In some embodiments, it is part of a method disclosed herein and a use disclosed herein to strip and deposit debris on the outside of the quartz tube by flushing with a chemical substance such as an inorganic acid such as hydrochloric acid, acetic acid, or formic acid or an organic acid such as citric acid remove.

For example, as shown in Fig. 4, in some embodiments, a stopcock such as e.g. a ball valve between the water filter and the junction of a return line in the inlet conduit, such as a check valve, be arranged. In some embodiments, a

Stopcock or ball valve may be arranged in the outlet line so that a connection of the return line is positioned on the outlet line between the reactor and this stopcock. In some embodiments, a first stopcock, e.g. a ball valve disposed in the inlet duct between the water filter and a mouth of a return duct and a second stopcock, e.g. a ball valve, may be arranged in the outlet conduit that a

Connection of the return line is positioned on the outlet line between the reactor and this stopcock. A cleaning step as described above can be carried out, for example, on an embodiment with such a first stopcock and such a second stopcock.

In a cleaning step as described above, only the two can in such cases

Shut-off valves, for example automatically, are closed. In this way, an internal closed circuit is made possible with the pump in the return line. In advance, certain amount of liquid can be drained via a tap, the example also

can be controlled automatically. A certain amount of a liquid chemical,

Typically, the same volume as the pre-drained amount of liquid is then from a metering pump, such as an automated metering pump, in the second

Reaction chamber metered to be circulated for a certain time by means of the arranged in the return line pump.

Subsequently, the desired amount of liquid chemical can be metered from the container by means of the metering pump in the lower region of the reactor and circulated by means disposed in the return line pump for a certain time in the internal closed circuit. After the cleaning process is complete, all the liquid can be drained through an outlet of the reactor, such as a tap. The ball valves can be opened again and the device can be run again in normal operation.

It may also dose hydrogen peroxide into the second reaction chamber, for example, in addition to a chemical already used.

For example, in some embodiments, the container may contain hydrogen peroxide.

Hydrogen peroxide can be filled into the container. That hydrogen peroxide can be controlled via the metering pump, for example automatically, in the lower range of the second Be pumped reaction chamber. The hydrogen peroxide can be mixed here with the process water and ozone and re-irradiated with UV-C light, for example at 254 nanometers. As a result, an additional oxidation effect can be achieved. Also, increasing the concentration of hydrogen peroxide effectively increases the formation of hydroxyl radicals, thereby intensifying the processes of the Advanced Oxidation Process (see above).

In the following, several embodiments of the device disclosed here will be described in more detail with reference to drawings. In all drawings, like reference numerals have the same meaning and therefore may be explained only once.

Figure 1 shows an embodiment based on a known device. The reactor (4) of the device contains a UV lamp (1), which usually UV light with two different

Gives off wavelengths. These can be the wavelengths of 185 nanometers and 254 nanometers. A quartz tube (2) surrounds the UV lamp (1). The quartz tube is disposed in the reactor (4) where it defines a first reaction chamber (5). The reactor of the apparatus has an inlet side (3) which in this case may contain an air supply to the first reaction chamber (5) for air (a), a lid, an air filter and a mounting plate.

The reactor (4) contains two separate reaction chambers: an inner cylinder (5) with the quartz tube (2) as the outer wall and the UV lamp (1) contained therein. The reactor further includes an outer cylinder (6) having a water inlet connection point and a water outlet connection point. In the reactor (4) with two reaction chambers, an air / ozone mixture (b) is formed in the first reaction chamber (5) from air (a) with 20% oxygen content.

The reactor includes an outlet for the formed air-ozone mixture (b) to which an air / ozone line (134) is coupled. The air / ozone line includes a check valve (22). By means of this air / ozone line, the air / ozone mixture (b) is fed into the inlet line for the process water (d) via an inlet point, designed as a Venturi nozzle (21). A feed point (21) for the air / ozone mixture (b) designed as a Venturi nozzle with a check valve in a bypass branch is fluidly connected to an inlet line (131) which is connected to the reactor (4).

In this case, the feed takes place in the bypass branching of the inlet line (131) for the process water. The second outer reaction chamber (6) of the reactor (4) contains an inlet line for the service water (d) connected to the reactor (4) and the air / ozone mixture (b) already fed into this. This second reaction chamber (6) is flowed through by the water to be treated, while it is exposed to the ultraviolet radiation of the UV lamp (1) having a wavelength of about 254 nanometers and is thus disinfected. The reactor (4) also contains a connected outlet line for the treated process water (e).

On the inlet line (31), a pressure sensor (7) is arranged. A ball valve (19) is in the

Inlet line (31) arranged. Furthermore, a circulating pump (16) is arranged in the inlet line (31). Between the circulation pump (16) and the ball valve (19), a filter (18) is arranged, which provides filtered service water (d). Process water (e) leaves the reactor through the outlet pipe (32). The reactor is installed in the flow direction downstream of the filter (18) and the circulation pump (16) in the main water circuit.

Via a nozzle (21), e.g. a Venturi nozzle, this is in a bypass branching of the

Inlet pipe fed. Air is guided along the UV lamp (1) within a quartz tube (2) and thus irradiated with UV light with a wavelength of 185 nanometers. This ultraviolet irradiation converts the oxygen in the air into ozone. Ozone leads to oxidation of micro-organisms in the water and low molecular weight organic compounds and salts. The ozone-air mixture is introduced in a bypass branch via a check valve (5) and a nozzle (21), e.g. a Venturi nozzle, introduced into the water cycle. In the second reaction chamber of the reactor (4), the process water (d) and the ozone / air mixture (b) fed therein are irradiated with UV light having a wavelength of 254 nanometers. This results in an oxidation of some poorly degradable low molecular weight organic

Compounds and dissolved gas ("micropollutants") such as bound chlorine, nitrite, pesticides, sulfur-containing organic compounds, hydrogen sulfide, pharmaceuticals, odors, and flavors, thus reducing their content, and further deactivating micro-organisms.

In order to ensure the intake capacity of the ozone-air mixture, for example in a range of about 1 liter per minute to 2 liters per minute, in a bypass line of the inlet line for the service water, the ozone / air mixture (b) via a nozzle (21) as a Venturi nozzle fed. The feeding power of the Venturi nozzle in the bypass line is of a certain

Pressure difference (between outlet pressure and inlet pressure of the Venturi system) and also dependent on the flow rate of the water.

The prevailing operating pressure can be read on the pressure gauge (7) when the ball valve (19) in the inlet line for the process water at the position where the nozzle (21) is located in a bypass line, is completely open. By closing the ball valve (19) slowly, if necessary, the inlet pressure is increased to the venturi nozzle located in the bypass. This should be about 0.3 bar higher than the required outlet pressure to feed the desired amount of ozone / air mixture can. It is advantageous to have a feed power of ozone /

To achieve air mixture of 1 liter per minute or more, to cool the UV lamp (1) sufficiently and allow efficient water treatment.

The feed rate may be, for example, in the range of 1 liter per minute up to 2 liters per minute. The operating pressure (or line pressure) is typically variable because, among other things due to the degree of contamination of the filter change the pressure conditions in the main water line. When the operating pressure varies, it is only conditionally possible to adjust the flow through the bypass by manually closing or opening the ball valve (19), in which the Venturi nozzle (21) is arranged.

As already explained in the foregoing, the reactor may contain a plurality of first reaction chambers arranged side by side. For example, a plurality of UV lamps be provided, which are each surrounded by a quartz tube and which each contain an outlet for the air / ozone mixture. To each of these outlets may be coupled an air / ozone line. In such embodiments, the feed-in power may relate to each of the first reaction chambers. The feed line in such embodiments may be several times the values indicated above.

Figure 2 shows an embodiment of the device disclosed herein. The device also has a reactor (4) with two separate reaction chambers. The first reaction chamber (5) is defined by an inner cylinder with a quartz tube (2) as the outer wall. Inside the first one

Reaction chamber (5) is a UV lamp (1) arranged. The UV lamp is arranged centrally in the reactor. In this case, the UV lamp is arranged centrally in the first reaction chamber (5). The second reaction chamber (6) is defined by an outer cylinder (2). Also in this embodiment, a UV lamp (1) is provided, which emits UV light with two different wavelengths. These are typically the wavelengths of 185 nanometers and 254 nanometers. The reactor of the apparatus has an inlet side (3) through which air (a) can enter the inner first reactor chamber (5). The second outer chamber (6) of the reactor contains a water inlet connection point and a water discharge connection point. An exit of the inner first reactor chamber (5) of the reactor is connected to a gas conduit (34), e.g. an ozone tube (34), which may include a check valve (22). A feed of the ozone / air mixture via a Venturi nozzle with check valve in a return line (33).

The feed rate may be, for example, in the range of 1 liter per minute up to 6 liters per minute, inclusive in the range of 1 liter per minute up to 4 liters per minute. In some embodiments, the feed rate is in the range of 2 liters per minute up to 5 liters per minute.

A pressure sensor is provided as a manometer (7), which is each provided with a transmitter. There are two pressure sensors (7) on both sides of the Venturi nozzle. The return line (33) in the embodiment shown here further comprises an optional flow sensor (8), which may also be provided with a transmitter. A fresh water supply (9) opens into the

Return line (33). Furthermore, the return line (33) includes a frequency-controlled pump (10). To the pump, a control element (11) for the pump 10 is connected. A control can be done on the basis of the determined pressure difference. Two shut-off valves (19) are provided with which the flow in the inlet line (31) and the return line (33) can be regulated.

From the already purified process water (e) is after the reactor (4) in a return line (33) diverted a portion of water and pumped by means of the frequency-controlled pump (10). The delivery rate of the frequency-controlled pump (10) can be regulated on the basis of the flow rate determined by means of the flow rate sensors (8) and / or on the basis of the pressure difference between the positions of the corresponding sensors determined by means of two pressure sensors (7). This regulation can be done automatically by a regulation (11). An embodiment of this regulation is illustrated in FIG. In this case, for example, the speed of the pump can be controlled. Through the fresh water supply (9) the purified process water (e) continues to be mixed with fresh water. The supply line (15) of fresh water (f) is arranged in the flow direction in front of the pump (10). Via the feed point (21), eg a Venturi nozzle, which can be coupled to a non-return valve, the ozone / air mixture is fed into the mixture of fresh water and purified process water. Immediately before the reactor (4), the air / ozone-added water (e ') is returned to the main water circuit, from where it is passed directly into the second reaction chamber (6). An additional non-return valve (20) prevents the return of the process water (d) in the direction of the feed point (21), eg a Venturi nozzle.

The already purified by means of the reactor process water (e) and also the fresh water supplied (f) are pressed by means of the pump (10) in the direction of the Venturi nozzle (21) to feed an optimal amount of air / ozone mixture (b) to be able to. Depending on the application, the feed rate of the air / ozone mixture (b) will be 2 to 6 liters per minute or more. In embodiments in which the reactor contains a plurality of first reaction chambers, the feed rate of the air / ozone mixture (b) may be 2 to 6 liters per minute or more per UV lamp.

Depending on the application and circulation rate, 1 to 4 liters per minute of air / ozone mixture can be fed in. The air / ozone mixture (b) is mixed by means of the Venturi nozzle (21) in very fine beads in the prepurified water (e) and / or the fresh water (f) and immediately before the reactor (4) in the main water circuit recycled.

By means of the control (11) and the pump (10), the flow through the return line (33) and / or the differential pressure before and after the feed through the Venturi nozzle (21) is kept constant. For example, the difference between the value of the downstream pressure sensor and the value of the upstream pressure sensor (7) can be regulated to an at least substantially constant value. Such a difference may be, for example, 0.3 bar. For this purpose, the frequency of the pump (10) can be controlled continuously. Thus, even under variable pressure conditions or even with variable circulation rates in the main water circuit, the feed rate of the air / ozone mixture (b) is automatically kept constant.

Since the processed process water (e) or the fresh water (f) contain very little impurities (eg micro-particle pollutants), most of the ozone (b) will not have reacted until mixed with the process water (d) to be purified becomes. If the route of the mixing of prepurified process water (e) or of fresh water (f) and service water is selected short, as shown in Fig. 2, the majority of the ozone (b) will not have reacted until it is in the second reaction chamber (6) of the reactor (4) passes. The water (e, f) added with ozone (b) is irradiated in the second reaction chamber (6) by means of the UV lamp (1) with UV light having a wavelength of 254 nanometers. Most of the remaining ozone reacts to an OH radical activated and reacts according to the Advanced Oxidation Process (s.o.), because it has a very high oxidation power.

A return of the mixture of fresh water and treated water (e ') is by means of Check valve (20) prevents, so that the fresh water supply (9) at this point in the system (9) is safely possible. The degradation of low molecular weight organic compounds and salts, in particular the degradation of body fluid products and humic acids by UV treatment in chlorinated water is much more expensive than the degradation of such compounds and salts in non-chlorinated water. The treatment of the fresh water (f) by the method disclosed here therefore allows a very efficient and premature reduction of micropollutants and thus leads to significant cost savings.

The use of a frequency-controlled pump (10) allows a stepless and stable

Feeding power of the air / ozone mixture (b) independent of fluctuating

Circulation capacities and pressure conditions in the main water circuit. For the feed of the air / ozone mixture by means of the Venturi nozzle (21), a pressure increase of 0.3 bar is required. Due to the arrangement provided here, such is only for a small partial flow in the system

Pressure increase necessary, but not in the entire water cycle. With the frequency-controlled pump (10) is still an automation of the feed via the Venturi nozzle possible. The

Frequency control of the pump provides additional cost savings.

FIG. 3 shows a further embodiment of the device disclosed here. The apparatus is similar to the apparatus shown in Fig. 2 and also has a reactor (4) with two separate ones

Reaction chambers. Also in this embodiment, part of the already purified process water (e) in a return line (33) is branched off and pumped back by means of the controllable pump (10) in the direction of the inlet line of the reactor. Also in this embodiment, fresh water supplied (f) is supplied to the treated process water (e) via a feed (9). In this embodiment, the air / ozone mixture (b) is fed into the fresh water (f) by means of a nozzle (21), for example a Venturi nozzle.

The device shown in Figure 3 includes an air supply regulator (27) disposed at the air inlet (30). With the aid of this air supply regulator, it is possible to control the amount of air which enters the first reaction chamber (5) of the reactor (4) via the air inlet (30). In this way, the ratio of volume of air entering the reactor and volume of water entering the reactor can be regulated. Thus, the ratio of the volumes of air and water to be treated can be changed in order to increase or decrease the relative amount of air / ozone mixture fed into the water to be treated. In this way, even with changes in the amount of water flowing into the reactor, the relative amount of air / ozone mixture fed into the water to be treated can be kept substantially constant.

Fig. 3 shows, inter alia, a circulation pump (16). This circulation pump may be an adjustable circulating pump such as a frequency-controlled circulating pump. It may be coupled to a control (17) for the pump (16), as shown for example in FIG.

The embodiment shown in Fig. 4 also has a reactor whose second reaction chamber (6) is defined by an outer cylinder (2). This contains a water inlet connection point and a water spout port, a tap (15), an inlet for a supply line for supplying chemicals and a port for the return line. In this embodiment, the apparatus further includes a container (14) with metering lance and level controller. Via a metering pump (13) of the container (14) via the supply line (26) to the reactor (4) is coupled. The second reaction chamber (6) of the reactor (4) further includes a tap (15).

A frequency-controlled circulating pump (16) is coupled to a control (17) for the pump (16). The regulation can take place with the aid of a flow sensor (8). A filter (18) serves the

Pre-cleaning of the process water. With the help of shut-off valves or sliders (19), the flow can be additionally shut off. Also in this embodiment, a non-return valve (20) is provided. Dirt and deposits on the outside of the quartz glass (2) can the

Deteriorate efficiency of the cleaning process strong, as this is the irradiation of UV light in the second reaction chamber (6) is hindered. Chemicals such as hydrochloric acid and citric acid can dissolve these deposits and contaminants from the surface. In the embodiment shown in Fig. 4 elements are included for this purpose. To clean the quartz glass, first the two ball valves (19) are closed to allow an internal closed circuit with the pump (10). In order to purify the quartz glass, an appropriate amount of liquid chemicals must be metered in the reaction chamber to be circulated by the pump (10) for a certain time. First, therefore, first the same amount of liquid is drained via the tap (15). Subsequently, from the container (14) by means of the metering pump (13) the second, outer reaction chamber (6) of the reactor (4), the desired amount of liquid chemicals supplied and by means of the pump (10) for a certain time in the internal closed circuit circulated. After the cleaning process is completed, all the liquid is drained via the tap (15). The ball valves (19) are opened again and the normal operation of the device can be done again.

For some water treatment processes, e.g. For industrial water, it may be useful to additionally dosed hydrogen peroxide in the second, outer reaction chamber (6). For this purpose, the container (14) hydrogen peroxide is supplied. This is supplied by means of the metering pump (13) of the second reaction chamber (6) of the reactor. The hydrogen peroxide is here mixed with the process water and ozone and existing OH radicals and additionally irradiated with UV light (254 nanometers). This optimizes the Advanced Oxidation Process (AOP).

An embodiment according to Figure 4 allows easy and automatic maintenance of the device without much labor.

In some embodiments of a method and apparatus disclosed herein, the treated, purified water may be collected and completely re-fed to the reactor of the apparatus. In some embodiments, a device disclosed herein may be used repetitively by utilizing already treated water rather than service water.

The individual system components and device variants of this device were tested in detail during the 7P EU research project "demEAUmed." Further information can be obtained from the project website: www.demeaumed.eu.

Fig. 5 schematically illustrates a control of an embodiment shown in Fig. 2, which may be automated. For the control, various measured values are determined and fed to a measuring unit (124) and made available to the control unit (125).

In normal operation, the minimum UV dosage in the second reaction chamber is monitored, measured via a UV sensor (36). If the UV dosage is less than 90% but more than 70% of the setpoint, the frequency-controlled (17) circulating pump (16) is throttled via the frequency control unit (131). However, if the UV dosage falls below 70% of the setpoint, the frequency-controlled (17) circulation pump (16) and additionally the frequency-controlled (11) pump (10) are switched off via the frequency control unit (131). The meter (124) may then issue an alarm signal.

There is also a monitoring of the temperature in the second reaction chamber by means of a temperature measurement (36). If the maximum temperature (e.g., at 40 ° C) in the second reaction chamber is reached or exceeded, the circulation pump (16) is turned off via a switching relay (127) and in addition the frequency controlled (11) pump (10) is switched off. In this case too, the measuring device (124) can issue an alarm signal.

Finally, monitoring and stabilization of the pressure difference to about 0.3 bar by means of two pressure sensors (7). For this purpose, the frequency control (11) of the pump (10) is addressed via the switching relay (130), so that a frequency control takes place.

An automatic supply of liquid chemicals such as hydrochloric acid can take place via the time control (126) and the metering pump (13).

For a reactor cleaning, the two shut-off valves are automatically closed via the control element (129). Subsequently, both the pump (10) and the circulation pump (16) are switched off via the control element (131). Then the tap (15) is opened and closed again for a limited period of time via the control element (128) so as to discharge a certain amount of water. Via the control element (126), a certain amount of chemicals in fluid form is then pumped into the reactor via the metering pump (13). Subsequently, by means of the control element (130) via the frequency control (11), the pump (10) is turned on to activate a resulting internal water cycle. After a predetermined period of time, the pump (10) is switched off again via the control element (130) by means of the frequency control (11). Over the control element (128) then the tap (15) is opened for a predetermined period of time and closed again, so as to drain a certain amount of water. Subsequently, the device can be run again in standard operation.

For a filter backwashing a power supply of the device is interrupted for a certain period of time and after completion of the rinsing process, the device is restarted. Figures 6 and 7 show further embodiments of the device disclosed herein. In these embodiments, the device includes an additional second controllable circulating pump (16 '). This second, controllable circulating pump (16 ') is arranged in a bypass branch (31a) of the inlet line (31). The first circulation pump (16) is arranged in the inlet line (31). This is both Circulating pumps connected in parallel. Between the second, controllable circulating pump (16 ') and the water filter (18), a check valve (113) is arranged in the bypass branch (31a). Also between the first circulation pump (16) and the water filter (18) a check valve (20 ') is arranged in the inlet line (31).

The apparatus shown in Figs. 6 and 7 also includes an air supply regulator (27). By means of this air supply regulator can regulate the volume of air per unit time, so for example, how many liters of air per minute, are included in the first reaction chamber (5). The more air is introduced into the reactor, the more ozone is formed in the first reaction chamber (5). For example, with changes in the volume of water introduced into the reactor per unit time through the inlet line, such as changes in liters of water per second, it may be advantageous to supply the amount of air / ozone mixture fed into the water to the reactor will adjust accordingly. This can be done by means of the air supply regulator (27).

The device shown in Figs. 6 and 7 also includes a temperature sensor (117) in the second reaction chamber (6). By means of the temperature sensor, it can be concluded whether the volume of water introduced into the reactor per unit time through the inlet line changes or remains constant. If the volume of water that is introduced into the reactor per unit of time through the inlet line decreases, the water will remain in the reactor for longer and thus be exposed to UV radiation for longer. There is a greater heating of the water, which can be detected by the temperature sensor (117). It protects the device from overheating.

The device shown in Figures 6 and 7 also includes a UV sensor (36) in the second

Reaction chamber. By means of the UV sensor, it can be monitored whether the minimum irradiation of UV light (254 nm) for the application and thus the minimum UV dosage in mJ / cm ² in the second reaction chamber are always ensured.

EMBODIMENTS

A device disclosed herein has been tested for its effect on microorganisms and disinfection by-products in two different sized embodiments with a single UV lamp and a maximum water flow of 76 m / h and 5 m / h. The measuring arrangement is shown in FIG. 7.

A device disclosed herein has been tested for inactivation of E. coli, Bacillus subtilis spores and MS2 phage in the one-way operation, ie without multiple treatment by the device disclosed herein. Bacillus subtilis spores (ATCC 6633) were incubated on Columbia Blood Agar Base for 44 ± 2 hours prior to use at 37 ° C. Bacillus subtilis spores (ATCC 6633) were incubated on Columbia Blood Agar Base for 44 ± 2 hours prior to use at 37 ° C.

Experiments were carried out at a flow rate of 76, 40 and 20 m / h. The water used was tap water at 12 ± 1 ° C and a pH of 8.3 + 0.1. As shown in Figure 8, E. coli was no longer detectable at all UV doses tested. FIGS. 9A and 9B show that comparably rapid killing of B.subtilis spores took place at all UV dosages. Fig. 10A and FIG. 10B show that simple UV irradiation is less effective compared to a device disclosed herein.

It should be understood that the foregoing description is intended to illustrate and not to limit the scope of the invention, which is defined by the scope of the ensuing claims. Other embodiments are within the scope of the following claims.

The invention has been extended and described generally. Each of the narrower species and subgenus clusters that fall under the general disclosure also forms part of the device. This includes the general description of the device with a condition or negative limitation that excludes an article from the genus, regardless of whether the excluded article is explicitly reproduced here.

Further embodiments are given in the following patent claims. Given features or aspects of the invention in the form of Markush groups, those skilled in the art will recognize that the corresponding subject matter is thus also described in terms of each individual member or subgroup of members of Markush's groups.

E N G L I S H E S T E

1) UV lamp

2) quartz tube

3) Air inlet side

4) reactor

5) first, inner reaction chamber

6) second, outer reaction chamber

7) Pressure sensor

8) Flow sensor

9) Fresh water supply

10) pump

11) Controller for pump 10

12) Stopcock

13) dosing pump

14) container

15) Tap

16) Circulation pump

16 ') adjustable circulating pump

17) Regulator for pump 16

18) filters

19) stopcock / slide

20) Check valve

20 ') check valve

21) feed-in point

22) Check valve

23) Gas outlet

24) Connection of the return line to the outlet line 32

25) Connection of the return line to the inlet line 31

26) Inlet for chemical line

27) Air supply regulator

30) air intake

31) inlet pipe

31a) Bypass inlet line

32) outlet pipe

33) return line

34) gas line 35) Fresh water line

36) UV sensor

37) Temperature sensor

40) swimming pool

41) Children's pool

42) sampling on the input side

42) Sampling on the output side

100) Device with return line (33), gas line (34) and feed point (21) according to FIG.

2

124) measuring unit

125) control unit

126) Control of the metering pump (13)

128) Tap control (15)

129) Control of the stopcock (12)

130) Control for the frequency control (11) the pump (10)

131) control of the pump (10) and the circulation pump (16)

212) Display

214) control unit

117) Temperature sensor

221) Air supply control

222) Temperature data transmission

223) Print data transmission

224) UV intensity data transmission

I) position "off"

II) position "reactor cleaning"

III) position "night mode"

IV) position "filter backwashing" a air

b Air / ozone mixture

c unfiltered service water

d filtered / service water

d * filtered process water / service water mixed with air / ozone

e processed process water

e 'treated process water mixed with air / ozone

f fresh water

f Fresh water mixed with air / ozone

g supply of chemicals. e.g. Hydrogen peroxide or hydrochloric acid or citric acid

Claims

Device for the treatment of service water (d) with ozone and ultraviolet radiation, comprising a reactor (4) having a first (5) and a second (6) reaction chamber, wherein the first reaction chamber (5) comprises a UV lamp (1) and an air inlet (30) and a gas outlet (23) for an air / ozone mixture (b), and the first reaction chamber is traversed by air, while exposing this ultraviolet radiation of the UV lamp (1) for the formation of ozone is

wherein an inlet line (31) for the process water (d, d *) and an outlet line (32) for the treated water are connected to the second reaction chamber (6) and the second reaction chamber (6) can be flowed through by the water to be treated, while the ultraviolet radiation of the UV lamp (1) can be exposed,

wherein an air / ozone line (34) is connected to the gas outlet (23) for the air / ozone mixture (b) via which the air / ozone mixture (b) in the inlet line (31) for the water to be treated (d, d *) can be fed, and

wherein the inlet duct (31) is adapted to a water filter (18) and a

Circulation pump (16) to be coupled, so that the water filter (18) between the

Circulation pump (16) and the reactor (4) is arranged, and wherein the circulation pump (16) is adapted to pump water in the reactor direction,

characterized in that

a return line (33) is provided for partially recycling the treated water (e) from the outlet line (32) to the inlet line (31), the return line (33) having a pump (10) adapted to direct water towards to pump the inlet pipe (31), and

i) has a feed point (21) at which the air / ozone mixture (b) in the service water (d) can be fed, and / or

ii) via a fresh water feed point (9) with a fresh water line (35) in fluid

Connection stands, wherein the fresh water line (35) has a feed point (21) at which the air / ozone mixture (b) in the fresh water (f) can be fed.

The process water treatment apparatus (d) according to claim 1, wherein the inlet pipe (31) comprises the water filter (18) and the circulation pump (16) adapted to pump water in the reactor direction, and wherein the water filter (18) interposes the circulation pump (16) and the reactor (4) is arranged.

Apparatus for the treatment of service water (d) according to claim 1 or 2, wherein the circulating pump (16) is a controllable circulating pump (16 ').

Apparatus for the treatment of service water (d) according to one of the preceding claims, wherein the controllable circulating pump (16 ') is a frequency-controllable circulating pump, wherein the frequency-controllable circulation pump (16 ') is optionally coupled to a controller (17).

Device for the treatment of process water (d) according to one of the preceding claims, wherein a second, to the circulation pump (16) connected in parallel, controllable circulating pump (16 ') is provided, which is adapted to pump water in the reactor direction and the second controllable circulating pump ( 16 ') in the flow direction in front of the water filter (18) in a bypass branch (31 a) of the inlet duct (31) is arranged and wherein (i) between the

Circulation pump (16) and the water filter (18) and (ii) between the second variable circulation pump (16 ') and the water filter (18) each have a check valve (20') is arranged.

Apparatus for the treatment of process water (d) according to one of the preceding claims wherein the return line (33) has a feed point (21) at which the air / ozone mixture (b) can be fed into the process water (d), and the pump (10) between the

Terminal (24) of the return line to the outlet pipe (32) and the feed point (21) for the air / ozone mixture (b) is arranged, or

wherein the return line (33) via a fresh water feed point (9) with a

Fresh water line (35) is in fluid communication, wherein the fresh water line (35) has a feed point (21) at which the air / ozone mixture (b) can be fed into the fresh water (f), and the pump (10) between the connection (24) of the return line is arranged on the outlet line (32) and the fresh water feed point (9),

Apparatus for the treatment of service water (d) according to one of the preceding claims wherein the feed point (21) for the air / ozone mixture (b) is designed as a Venturi nozzle.

Apparatus for the treatment of service water (d) according to one of the preceding claims, wherein the return line (33) via a connection (25) to the inlet line (31) is connected, wherein the terminal (25) by a check valve (20) or a

Check valve is defined.

Device for treating process water (d) according to one of the preceding claims, wherein the inlet line (31) and / or the return line (33) has a pressure sensor (7) and / or wherein the second reaction chamber (6) a temperature sensor ( 37) and wherein the controllable circulating pump (16) can be regulated by means of the values that can be output by the pressure sensor (7) and / or the temperature sensor (37).

Device for the treatment of service water (d) according to one of the preceding claims, wherein the return line (33) via a connection (25) to the inlet line (31) is connected and the water filter (18) in the inlet line (31) in the flow direction before this connection is arranged. 11. An apparatus for treating process water (d) according to one of the preceding claims, wherein the reactor (4) further comprises an inlet for a conduit (26) for supplying chemicals such as H ₂ 0 ₂ , hydrochloric acid, citric acid or the like from a container (14) with a metering pump (13).

Device for the treatment of service water (d) according to one of the preceding

Claims, wherein the air inlet (30) of the first reaction chamber (5) is controllable, wherein the air inlet (30) is optionally coupled to an air supply regulator (27),

Device for the treatment of service water (d) according to one of the preceding

Claims, wherein the pump (10) is adjustable in frequency so that the suction power for the air / ozone mixture (b) is constant and / or

wherein the air inlet (30) of the first reaction chamber (5) is controllable such that the suction power of air to the flow rate of water through the second reaction chamber (6) of the reactor is adaptable.

Use of the device according to one of the preceding claims for the continuous treatment of service water (d), wherein the inlet line (31) of the device comprises a water filter (18) and a circulation pump (16), the water filter (18) being arranged between the circulation pump (16). and the reactor (4) and the circulation pump (16) is adapted to pump water in the direction of the reactor, and wherein the use comprises:

Pumping process water (d) by means of a circulation pump (16) via the inlet line (31) in the reactor (4),

in the first reaction chamber of the reactor (4) exposing through-flowing air to the ultraviolet radiation of the UV lamp (1) for the formation of ozone,

in the second reaction chamber (2) of the reactor (4) exposing flowing, enriched with an air / ozone mixture, process water (d) relative to the ultraviolet radiation of the UV lamp (1), and

a) partial recycling of the treated water (e) via the return line (33) into the process water (d) and feeding the resulting air-ozone mixture (b) into the recirculated treated water (e),

wherein the feed of the air-ozone mixture (b) via the feed point (21) in the recirculated water (e) takes place before the recirculated water (s) the

Domestic hot water (d) is supplied and wherein the pressure of the recirculated water (e) is increased by means of the pump (10), and / or

b) further pumping of service water (d) by means of the second, to the circulation pump (16) connected in parallel, controllable circulation pump (16 ') via the bypass branch (31a) and the inlet line (31) in the reactor (4).

Process for the treatment of service water (d) with ozone and ultraviolet radiation by means of a device according to one of claims 1 to 13, wherein the inlet duct (31) the device comprises a water filter (18) and a circulation pump (16), wherein the water filter (18) between the circulation pump (16) and the reactor (4) is arranged and the circulation pump (16) is adapted to pump water in the reactor direction , and wherein the method comprises:

pump process water (d) into the reactor (4) by means of a circulating pump (16) via the inlet line (31),

Allow air to flow through the first reaction chamber of the reactor (4) while exposing this air to ultraviolet radiation from the UV lamp (1) so that ozone is formed, feeding the resulting air-ozone mixture (b) into the process water (d) .

let the process water (d) flow through the second reaction chamber (2) of the reactor (4) while exposing it to the ultraviolet radiation of the UV lamp (1),

characterized in that the method further comprises

the recycled water (e) via the return line (33) partially back into the process water (d), feed the air-ozone mixture (b) via the feed point (21) in the recycled water and the pressure in the recirculated water by means of Increase pump (10).