WO2017129247A1

WO2017129247A1 - Cleaning installation, process water preparation system and method for preparing process water

Info

Publication number: WO2017129247A1
Application number: PCT/EP2016/051845
Authority: WO
Inventors: Roland HOLLERUNG; Markus Hofer; Markus HOLCH; Roland Kurz
Original assignee: Alfred Kärcher Gmbh & Co. Kg
Priority date: 2016-01-28
Filing date: 2016-01-28
Publication date: 2017-08-03
Also published as: EP3408231A1

Abstract

In order to improve a process water preparation system for preparing process water in a process water circuit of a cleaning installation, in particular a carwash – wherein, in the process water circuit, dirty process water from the cleaning installation is collected and cleaned, oxygen is supplied to the cleaned process water and the cleaned and oxygen-enriched process water is stored in order to be returned to the cleaning installation when required, the process water preparation system having a measuring device for measuring the oxygen content in the process water in order that oxygen can be supplied to the cleaned process water depending on the measured oxygen content – so as to minimize noise during operation of the cleaning installation, it is proposed that the measuring device is designed to measure an actual value of the oxygen content in the cleaned and oxygen-enriched process water after enrichment with oxygen. Also proposed are an improved cleaning installation and an improved method for preparing process water in a process water circuit of the cleaning installation.

Description

Cleaning plant, process water treatment system and process for the treatment of process water

The present invention relates to a process water treatment system for treating process water in a process water circuit of a cleaning system, in particular a vehicle washing system, in which process water polluted service water is collected and purified from the cleaning system, the purified process water is supplied oxygen and the purified and enriched with oxygen process water is stored, to re-supply it to the cleaning system as required, which service water treatment system comprises a measuring device for measuring an oxygen content in the service water, so that the purified process water oxygen can be supplied depending on the measured oxygen content.

Furthermore, the present invention relates to a cleaning system with a process water circuit.

Furthermore, the present invention relates to a method for treating process water in a process water circuit of a cleaning system, in particular a vehicle washing system, in which method polluted service water is collected and purified from the cleaning system, in which the purified process water is supplied to oxygen and the purified and oxygenated Hot water is stored in order to re-supply it to the cleaning system when needed, the oxygen content is measured in the purified service water and the purified process water oxygen is supplied as a function of the measured oxygen content.

It is known for plants which have a high water requirement, for example in cleaning systems in the form of vehicle washing systems. to treat dirty service water again and to feed it cleaned again after passing through a service water circuit of the cleaning system. In this way, a water consumption of a cleaning system compared to a pure fresh water operation can be significantly reduced.

A problem with such hot water circuits, however, is that dirty service water, but also already purified or treated service water, due to biological oxygen depletion in insufficient oxygen supply can tilt into an anaerobic state. This condition produces odorous substances such as hydrogen sulfide (H ₂ S) or ammonia (NH ₃ ). Such unwanted odor development usually has a deterrent effect on customers and operators of the cleaning system.

In order to avoid the formation of such odorous substances, it is known to supply the service water with sufficient oxygen. Usually, the process water is enriched with oxygen in such a way that at least 5 mg / l are contained in the treated process water. However, to achieve such a high oxygen content in the service water without measuring it, it is necessary to spend an enormous amount of energy. This is both economically and ecologically questionable and therefore not timely.

It is therefore an object of the present invention to improve a service water treatment system, a cleaning system and a method of the type described above so that in particular odor nuisance during operation of the cleaning system are minimized and as little energy must be expended.

This object is achieved in a process water treatment system of the type described above according to the invention that the measuring device is designed to measure an actual value of the oxygen content in the purified and enriched with oxygen process water after enrichment with oxygen. The proposed development provides, in particular, not to measure the oxygen content in the service water where the oxygen is introduced, for example in a ventilation tank or aeration tanks, but there, where the hot water is cached, for example, before it is returned to the cleaning system. The measuring device can also be arranged at other points of the process water circuit, which are connected to the supply of oxygen, so for example in domestic water pipes to a hot water tank in which purified and oxygenated hot water is cached, or in service water pipes that lead from the hot water tank to the cleaning system , This embodiment has the particular advantage that the oxygen content in the service water is measured exactly where it depends on a minimum level of oxygen, in order to avoid tipping into an anaerobic state of the process water. It is thus measured in particular where a measurement of the oxygen content can not be falsified by the direct supply of oxygen. Furthermore, the measurement makes it possible, in particular in a storage tank with purified and oxygen-enriched service water, optionally to regulate the supply of oxygen during aeration of the service water so that where the measuring device is arranged, that is in many cases spatially far from the place of supply of oxygen, for example, just before the inlet of the process water to the cleaning system, the process water still has the oxygen content required to avoid odor nuisance.

It is advantageous if the measuring device is designed to measure the actual value in the cleaned and enriched with oxygen stored process water or when supplying the stored process water to the cleaning system. As already explained, it is possible, for example, to measure the oxygen content in a process water store where the purified and oxygen-enriched service water is stored prior to returning it to then control, for example, the supply of oxygen elsewhere in the service water circuit

Service water still the required oxygen content is present. It is advantageous if the service water treatment system comprises a collecting container for dirty service water of the cleaning system, which collecting container has a collecting container inlet fluidically connected or connectable to a dirty water outlet of the cleaning system. Such a collecting container can be arranged, for example, underground and below a cleaning system, so that contaminated service water can be collected without the use of pumps. A light-tight arrangement of the collecting container has advantages, in particular to avoid algae formation in dirty hot water, also referred to as dirty water.

Furthermore, it may be favorable if the process water treatment system comprises a cleaning device, which is fluidically connected to a collecting container outlet of the collecting container, for cleaning used hot water from the collecting container, which cleaning device is fluidically connected to the collecting container. Preferably, the cleaning device is designed for cleaning the process water by filtering and / or by sedimentation and / or by chemical treatment and / or by biological treatment. For example, the cleaning device may comprise a filter device with one or more filters. The cleaning device may also comprise a sedimentation basin in which suspended matter can settle. A chemical treatment in particular allows the removal of chemical pollutants from the process water. Also optionally an oil separator may be provided to separate oil or other fuels from motor vehicles from the service water.

According to a further preferred embodiment of the invention, the process water treatment system may comprise a ventilation container in which oxygen is supplied to the collected dirty service water or the collected and purified service water, wherein the aeration container with the collection container directly or via the cleaning direction indirectly fluidly connected. In the aeration tank, a sufficient amount of oxygen can be supplied to the process water in order to prevent the process water from tipping over into an anaerobic state. In particular, the sump, also called sump, if it serves as a sedimentation, directly with the aeration tank, hereinafter also referred to as aeration tank, be connected fluidly effective to direct hot water from the sump directly into the aeration tank.

Furthermore, it is advantageous if the process water treatment system has an oxygen supply device for supplying oxygen into the process water in the aeration container. With such an oxygen supply device, oxygen can be supplied to the process water contained in the aeration container in a very targeted manner.

The supply of oxygen in the aeration container becomes particularly simple when the oxygen supply device has an oxygen outlet arranged in the aeration container. The oxygen outlet can be designed, for example, in the form of a nozzle with one or more outlet openings, in order to introduce oxygen into the process water with high efficiency.

It is favorable if the oxygen supply device comprises a delivery device and / or if the oxygen supply device comprises or is fluidically connected to a compressed air network in order to supply compressed air containing oxygen to the purified process water. With this conveyor, oxygen, in particular pure oxygen or in the ambient air of the cleaning system or in the compressed air contained oxygen, are introduced into the process water. The conveying device can be designed in particular in the form of a pump and, for example, comprise a fan in order to introduce oxygen into the process water under a predetermined pressure and optionally also with a predefinable volumetric flow. The oxygen supply device can in particular also be a compressed air comprise network or be connected with such a fluid effective to supply the service water oxygen-containing compressed air.

Furthermore, it is advantageous if the process water treatment system comprises a storage container for storing the purified and enriched with oxygen process water, which storage container is connected on the one hand fluidly connected to the aeration tank and on the other hand with the cleaning system. In the storage tank, service water can be cached to always keep a sufficient amount of hot water available for operating the cleaning system.

Conveniently, the measuring device is arranged for measuring the oxygen content in the storage container or formed in this. This arrangement has the advantages already described above, namely in particular that the oxygen content in the service water is determined exactly where the service water may have a very long residence time. In addition, the process water from the storage tank is usually fed directly to the cleaning system, so that in the event of a tipping over of the service water in the storage tank in the anaerobic state high odor in the cleaning system would result.

Preferably, the measuring device is designed in the form of an oxygen probe. With such an oxygen content in the process water can be measured in a simple and safe way.

According to a further preferred embodiment of the invention it can be provided that the service water treatment system comprises a cleaning device for cleaning the measuring device as a function of at least one measured variable. In particular, the at least one measured variable may be a soiling state of the measuring device and / or an operating time since a preceding cleaning and / or a water quality of the cleaned and oxygenated industrial water. Thus, depending in particular on a water quality of the cleaned and with suction enriched service water, the measuring device are cleaned according to demand.

In a simple way, the measuring device can be cleaned when the cleaning device is designed to act on the measuring device for cleaning with a cleaning medium jet. The cleaning device is therefore in particular designed to generate a jet from a cleaning medium, which is directed to clean the measuring device on this.

The measuring device can be cleaned in a particularly simple and cost-effective manner if the cleaning medium jet contains air or consists of air. Thus, on the one hand, the measuring device can be cleaned and, on the other hand, further oxygen can be introduced into the process water.

Depending on the specific embodiment of the measuring device, it may be advantageous if the cleaning device is designed to form the cleaning medium beam in the form of a spot beam, a fan beam, a cone beam or an annular beam. In particular, the cleaning device may have correspondingly shaped outlets for the cleaning medium for forming the exemplified forms of cleaning medium jets.

In a simple and targeted manner, a cleaning medium beam can be directed to the measuring device when the cleaning device comprises a jet device for forming the cleaning medium jet, in particular in the form of a nozzle. In particular, when the measuring device is immersed in the service water when using the cleaning device, such a jet device makes it possible to direct the cleaning medium jet at a sufficiently high speed on the measuring device, for example on a measuring diaphragm of the same. It is advantageous if the cleaning device is designed to generate a continuous or intermittent cleaning medium jet. Optionally, it can also be provided that the cleaning device for a certain period of time the measuring device with a continuous cleaning medium jet applied and impinges the cleaning medium intermittently on the measuring device for a different period of time.

It is favorable if the cleaning device comprises an alignment device for setting a position and / or an orientation of the cleaning medium jet. In particular, the cleaning device can be designed such that the cleaning medium beam is vertically and / or horizontally aligned with respect to the direction of gravity and / or in predetermined or predefinable stages or stepless manually or automatically. In this way, the cleaning medium beam can be optimally aligned with the measuring device to be cleaned, for example a measuring diaphragm of the same. In addition, it is also possible, for example, to scan an area of the measuring device to be cleaned with the cleaning medium jet, for example automatically or manually, by manually actuating or automatically controlling the aligning device.

Advantageously, the alignment device is designed for manual or automatic alignment of the cleaning medium jet to the measuring device. In particular, the alignment device can be designed for mechanical, pneumatic or electrical alignment of the cleaning medium jet. In particular, for automatic alignment of the cleaning medium jet or a jet device, for example in the form of a nozzle, the cleaning device may be provided with a drive, for example a pneumatic, mechanical or electric drive.

In a simple manner, the cleaning medium beam can be aligned if the alignment device is arranged or formed cooperatively with the jet device. By positioning and / or orienting the beam device with the alignment device, the cleaning medium beam can be directed in the desired direction.

For the measurement of the oxygen content in the service water, it is advantageous if the measuring device has a measuring diaphragm. Through this oxygen can diffuse through and be detected with one or more sensors of the measuring device.

In order to arrange the measuring device in the desired manner for measuring the oxygen content of the service water, it is advantageous if the service water treatment system comprises a holding device for positioning and holding the measuring device in a storage tank or in a hot water line, which fluidly connects the aeration tank with the storage tank, or in a service water pipe, which fluidly connects the storage tank with the cleaning system. The holding device makes it possible, in particular in a simple manner, to retrofit existing cleaning systems and service water treatment systems with a measuring device in order to measure the oxygen content in the cleaned and in particular stored service water.

According to a further preferred embodiment of the invention, it may be provided that the service water treatment system comprises a control and / or regulating device, which is designed to cooperate with the measuring device for detecting an actual value of the oxygen content in the service water measured by the measuring device and for comparing the measured actual value and a predetermined or predefinable setpoint value by calculating a difference value between the actual value and the setpoint value for the oxygen content in the purified and oxygen-enriched process water. In particular, it may be the stored process water. To provide such a control and / or regulating device opens in particular the option of other facilities of the service water treatment system, for example, depending on the measured Actual value of the oxygen content or the calculated difference value to control and / or to regulate.

Advantageously, the service water treatment system comprises an input device cooperating with the control and / or regulating device for inputting the desired value. With the input device, for example, a desired value can be set individually depending on certain operating modes of the process water treatment system and optionally also changed. For example, the input device may be a keyboard interacting with a computer. For example, the control and / or regulating device may be in the form of a computer or a programmable logic controller.

It is advantageous if the control and / or regulating device is designed to control the oxygen supply device for supplying oxygen into the process water in the aeration container as a function of the calculated difference value for a ventilation time and / or with a volume flow dependent or independent of the difference value. In this way, the required amount of oxygen targeted and demand-dependent the

Hot water to be supplied to the ventilation, namely time-dependent and / or quantity-dependent by automatic adjustment of a respective aeration time and / or a volume flow of the supplied oxygen.

Advantageously, the control and / or regulating device comprises at least one timer for setting a ventilation time during which oxygen is supplied to the process water. In particular, the timer may be configured to specify the aeration time during which the oxygen supply device is activated in order to supply oxygen to the process water.

According to a further preferred embodiment of the invention, it may be provided that the service water treatment system comprises a service water circulation device for circulating the service water in the service water treatment system. In particular, the domestic water circulation be formed to circulate the polluted service water, the purified and enriched with oxygen process water and / or the purified and enriched with oxygen stored service water. Furthermore, in particular, the service water circulation device can be configured to supply the cleaning system without request to the same service water, which then flows back into the collection container and from there continues to run through the service water treatment system as long as the service water circulation device is activated. In particular, the hot water circulation device can be activated as a function of time or, for example, when the oxygen content in the storage tank falls below the desired value. This makes it possible, in particular, to supply service water with a higher oxygen content to the storage tank in order to achieve the setpoint value for the oxygen content in the purified and oxygenated service water.

Conveniently, the service water circulation device is fluid-effectively connected to the collecting container, the aeration container and / or the storage container for circulating the service water in the collecting container, in the aeration container and / or in the storage container. In particular, the service water circulation device may comprise a pump which conveys the process water through the process water treatment system.

Furthermore, it is favorable if the control and / or regulating device is designed to control and / or regulate the hot water circulation device. In particular, the control and / or regulating device with the

Brauchwasserumwälzeinrichtung be cooperatively designed such that a control and / or a regulation of the hot water circulation device in dependence on the measured actual value or in dependence of the calculated difference value. As already stated, for example, service water can be promoted with a low oxygen content in the cleaning system and service water with a higher oxygen content are promoted in the storage tank, in particular in the storage tank the To increase the oxygen content so that it is at least equal to the nominal value.

According to a further preferred embodiment of the invention can be provided that the service water treatment system is designed in the form of a retrofit kit for a cleaning system, which retrofit set the measuring device, at least one connecting line for effectively connecting the measuring device with a computer or a control and / or regulating device and a computer program with program code means which are suitable, when the computer program has run on a computer and / or a control and / or regulating device of the type described above, to carry out one of the methods described in detail below. The retrofit kit makes it possible, in particular, to easily control and regulate a purification plant in which service water is collected and aerated by the addition of oxygen in the manner proposed above, so that an oxygen content of the service water, in particular in a storage tank, always sufficient having high oxygen content in order to avoid the tipping of the process water in an anaerobic state, in which case in particular as little energy must be expended.

It is advantageous if the retrofit kit comprises a computer program product with a computer-readable medium and a computer program stored on the computer-readable medium with program code means which are suitable for running the computer program on a computer and / or a control and / or regulating device of the above-described Type of one of the methods described in detail below. In particular, one of the methods described below can thus be implemented in a simple manner on an existing cleaning system with a process water treatment system. Preferably, the retrofit kit comprises the above-described holding device. With this, the measuring device can be arranged for example in a storage container of the cleaning system.

Furthermore, it may be advantageous if the retrofit kit includes the control and / or regulating device. For example, the measuring device can thus be coupled via the control and / or regulating device with an oxygen supply device which is installed in an existing cleaning system and can also control it accordingly.

The object stated in the introduction is also achieved according to the invention in a cleaning system of the type described in the introduction by comprising one of the above-described advantageous service water treatment systems.

A cleaning system equipped in this way then also has, in particular, the advantages described above in connection with preferred embodiments of service water treatment systems.

It is advantageous if the cleaning system is designed in the form of a vehicle washing system. In particular, the vehicle washing system may be designed for automatic and / or manual vehicle cleaning. In particular, so commercial vehicles or passenger cars can be cleaned mechanically, semi-automatically or fully automatically.

The object stated in the introduction is also achieved in a method of the type described in the introduction by measuring an actual value of the oxygen content in the purified and oxygen-enriched service water.

In particular, as described above, this procedure has the advantage that the actual value of the oxygen content is not measured where the process water is enriched with oxygen, but instead at a point downstream in the process water cycle. For example, the measurement tion of the actual value of the oxygen content in a water heater, such as a service water tank, the cleaning system done.

It is advantageous if the actual value of the oxygen content in the purified and enriched with oxygen stored service water or when supplying the stored service water to the cleaning system is measured. This procedure is particularly advantageous because the oxygen content is measured exactly where a large amount of service water is at least temporarily stored or cached. If the cleaning system is out of operation for a longer period of time, the oxygen content can drop, in particular in the stored process water, and fall below a predetermined or predefinable setpoint. If this occurs, in particular by replacing the stored process water and increasing its oxygen content, a tipping over of the stored process water into an anaerobic state can be prevented. In this way, an odor nuisance through the cleaning system can be completely or at least largely avoided.

It is advantageous if the purified process water oxygen is supplied when the measured in the purified and enriched with oxygen service water actual value of the oxygen content is below a predetermined or predefinable setpoint for the oxygen content. In particular, an amount of oxygen per unit time can be adjusted. Furthermore, for example, oxygen can only be supplied if this is actually necessary. This makes it possible to operate the cleaning system particularly efficiently.

Preferably, the setpoint for the oxygen content is given with a value of at least 2 mg / l. With such an oxygen content, the tipping of the process water into an anaerobic state can be avoided or largely avoided. In order to more reliably avoid the tipping of the process water into an anaerobic state, it is advantageous if the desired value for the oxygen content is set to a value of at least 3 mg / l.

It is favorable if the actual value and the nominal value are compared by calculating a difference value between the nominal value and the actual value and if, depending on the difference value, the purified industrial water is supplied with oxygen for an aeration time that is dependent or independent of the differential value. For example, oxygen can be supplied to the service water for a defined ventilation time or for a ventilation time, which depends on how large the difference value is. If the actual value is only slightly above the setpoint value, it is possible, for example, to ventilate longer than with a correspondingly larger difference value, which results if the actual value is significantly above the setpoint value. If the actual value is below the setpoint value, ventilation is continued until the actual value corresponds to the setpoint, for example. So if the difference value is zero, then oxygen can be supplied to the service water again for a certain predetermined ventilation time.

Advantageously, the purified process water oxygen is supplied with a predetermined volume flow when measured in the purified and enriched with oxygen hot water actual value of the oxygen content is below a target value for the oxygen content. The volume flow can be fixed. An amount of oxygen that is supplied to the process water can then be specified, for example, over a period of ventilation.

Advantageously, the volume flow is set automatically as a function of the calculated difference value or independently of the difference value. In this way, the amount of oxygen to be supplied to the process water can be controlled not only by the duration of the supply but also by the amount of the supplied oxygen by adjusting the volume flow. This can be done manually and preferably automatically. For carrying out the method, it is advantageous if the oxygen content in the purified and enriched with oxygen service water is measured with a measuring device. For example, the measuring device may be an oxygen measuring probe with corresponding sensors.

It is favorable if the measuring device is cleaned as a function of at least one measured variable. The measured variable may in particular be a contamination state and / or an operating time since a preceding cleaning and / or a water quality of the purified and oxygen-enriched service water. By cleaning the measuring device is particularly ensured that the oxygen content of the service water can always be determined with sufficient accuracy. In addition, the function of the measuring device is made permanently possible. In particular, the measuring device can be freed of soiling in the form of particles or deposits, for example, deposits of chemical drying aids that are used in the cleaning system, which can be deposited, for example, on a measuring membrane of the measuring device.

In a simple way, the measuring device can be cleaned when it is applied for cleaning with a cleaning medium beam. The cleaning medium can be a liquid or a gas, preferably air, which can be supplied directly from the environment of the cleaning system.

It is advantageous if the measuring device is acted upon for cleaning with an air-containing or consisting of air cleaning medium beam. Air is available in the environment of the cleaning system in any quantity. In addition, the introduction of air for cleaning the measuring device to the service water also supplied oxygen at the same time. The measuring device can be cleaned particularly reliably when the cleaning medium jet in the form of a spot jet, a fan jet, a cone jet or an annular jet is directed onto the measuring device. The shape of the cleaning medium jet can be adapted in particular to a shape of a surface of the measuring device to be cleaned.

It is advantageous if the cleaning medium jet is aligned manually or automatically on the measuring device. For example, an alignment can take place mechanically, pneumatically or electrically, in particular by means of a drive suitable for this purpose. By an automatic alignment of the cleaning medium beam can for example be guided over a surface to be cleaned or even aligned so that it hits a surface to be cleaned, such as a measuring membrane, the measuring device.

Particularly good cleaning results can be achieved if the measuring device is subjected to cleaning with the cleaning medium jet continuously or intermittently. For example, depending on the type of contamination continuously or intermittently cleaning medium can be passed to the cleaning device.

Furthermore, it may be advantageous if an alignment of the cleaning medium beam is adjusted vertically and / or horizontally with respect to the direction of gravity in predetermined stages or steplessly manually or automatically. In this way, a reliable cleaning of the measuring device can be achieved.

It is advantageous if the polluted process water is purified by filtration and / or sedimentation and / or chemically and / or biologically. Depending on the type of contamination of the process water one or more types of cleaning, especially in any combination of the specified cleaning variants, achieve good results in the purification of the process water. The following description of preferred embodiments of the invention is used in conjunction with the drawings for further explanation. Show it :

Figure 1: a schematic overall arrangement of a cleaning system with a service water treatment system;

Figure 2 is a schematic representation of a retrofit kit of a water treatment system for a cleaning system;

FIG. 3 is a schematic flow diagram of the control of an oxygen supply device; and

4 shows a schematic representation of a measuring device held on a holding device with a jet device held on an aligning device of a cleaning device for the measuring device.

FIG. 1 shows, by way of example and schematically, a cleaning system 10 and a process water treatment system 12.

The cleaning system 10 is designed in the form of a vehicle washing system 14 for the automatic cleaning of motor vehicles. It comprises a cleaning chamber 18, in which the motor vehicle 16 can be introduced and cleaned with rotatable cleaning brushes 20 and 22 under the action of a cleaning fluid. Optionally, such a cleaning system 10 may also be designed to carry out high-pressure washing and / or under-floor washing.

The cleaning fluid is preferably water which circulates as process water in a process water circuit 24, described in detail below, of the process water treatment system 12 and of the purification system 10. To compensate for service water losses in the process water circuit 24, this can also be supplied fresh water.

The water used for cleaning the motor vehicle 16 is collected as dirty service water 26 in a below a footprint 28 of the vehicle washing system 14 for the motor vehicle 16 in a drip pan 30 and passed through a connecting line 32 into a sump 34. The connecting line 32 thus connects a dirty water outlet 36 of the cleaning system 10 to a collecting container inlet 38 of the collecting container 34. The dirty industrial water 26 contained in the collecting container 34 comes to rest therein, so that dirt can settle in part by sedimentation.

The collecting container 34, also referred to as a reservoir, is in fluid communication via an overflow 40 with a ventilation container 42.

The aeration tank 42 then contains, at least partially, purified process water, which is referred to below as purified process water 44.

In the aeration tank 42 hangs a pumping device 47 which defines a ventilation container outlet 48. The pump device 47, on which a float device 46 is arranged, is fluidically connected via a connecting line 52 to an inlet of a filter device 50. On the pressure side, the filter device has a first filter outlet 54, which is fluid-effectively connected to a storage container inlet 58 of a storage container 60 in a fluid-efficient manner via a connecting line 56.

An overflow 62 of the storage container 60 is fluidly connected via a connecting line 64 to a sewer 66 of a sewer network 68. Optionally or alternatively, the aeration tank 42 can also be fluidically connected to the sewer 66 via a connecting line 65 be. This is shown schematically in FIG. 1 by the connection line 65 shown in dashed lines.

The storage container 60 further comprises a storage container outlet 70, which is fluidly connected to a further pumping device 72 via a connecting line 74. The pumping device 72 is fluidly connected via a further connecting line 76 with a hot water inlet 78 of the cleaning system 10 on the pressure side.

The service water inlet 78 is fluidly connected in a manner not shown with water discharge devices of the cleaning system 10, in particular in the form of nozzles to act on the motor vehicle 16 to be cleaned and cleaning brushes 20 and 22 in the cleaning room with hot water.

The storage container 60 may include one or more tanks 80 in fluid communication with one another via a connection line 82.

Furthermore, a further outlet 84, which is in fluid connection via a connecting line 86 to the connecting line 32, can be provided on the storage container 60. Through the connecting line 86, service water can be supplied from the storage container 60 to the collecting container 34 again by means of a pumping device 87 installed, for example, in the connecting line 86.

On the pressure side, the filter device 50 has a second filter outlet 88, which is connected to the connecting line 86 in a fluid-efficient manner via a connecting line 90. Thus, either hot water can be pumped from the aeration tank 42 after flowing through the filter device 50 in the storage container 60 or via the connecting lines 90, 86 and 32 back into the collecting container 34. The said connection lines in connection with the pumping device 47 thus form a service water circulation device 92. The process water treatment system 12 further comprises an oxygen supply device 94 comprising an air pump 96, which is fluidly connected via a connecting line 98 fluidly effective with a arranged in the aeration tank 42 oxygen outlet 100. The oxygen supply device 94 may in particular also comprise a compressed air network or be connected to such a fluid effective in order to supply compressed air containing oxygen to the process water.

The air pump 96 is connected via a control line 102 with a control and / or regulating device 104 to control.

In the storage container 60, a measuring device 106 is arranged for measuring an actual value of the oxygen content of purified and oxygen-enriched process water 108 contained in the storage container 60.

The measuring device 106 and the control and / or regulating device 104 are coupled to each other via a measuring line 110, so that the actual value of the oxygen content in the storage container 60 measured with the measuring device 106 can be transmitted to the control and / or regulating device 104. Instead of the measuring line 110, a data exchange between the measuring device 106 and the control and / or regulating device 104 can also be made equally contact or wireless, for example via radio, Bluetooth or W-Lan, if appropriate interface devices are provided.

Furthermore, the measuring device 106 is assigned a cleaning device 112, which is connected in a fluid-effective manner via a connecting line 114 to a further air pump 116.

The measuring device 106 is shown schematically in FIG. 4 in the form of an oxygen measuring probe 118. It comprises a measuring diaphragm 120 through which Oxygen of the purified and oxygen-enriched process water 108 can diffuse through to sensors, not shown in detail, with which the oxygen in the oxygen measuring probe can be detected.

For positioning and holding the measuring device 106 in the storage container 60 is a holding device 122. This includes a receptacle 124 for the Sauerstoffmessonde 118th

The cleaning device 112 is designed to apply a cleaning medium jet to the measuring device 106. By applying the measuring device 106, in particular the measuring diaphragm 120, this is cleaned.

The cleaning device 112 comprises a jet device 125 in the form of a nozzle 126 for forming the cleaning medium jet. As a cleaning medium, air is used, which is supplied via the connecting line 114 from the air pump 116.

The air pump 116 is optionally coupled via a control line 128 to the control and / or regulating device 104. This can in particular control an operation of the air pump 116 in the desired manner, for example, depending on a degree of contamination of the measuring device 106 and / or an operating time thereof since a previous cleaning and / or a water quality of the purified and oxygenated process water 108 in the storage container 60.

The nozzle 126 may be formed in the form of a pebble nozzle for forming a cleaning medium beam in the form of a spot beam, a fan nozzle for forming the cleaning medium beam in the form of a fan beam, a cone jet nozzle for forming the cleaning medium beam in the form of a cone beam or in the form of an annular nozzle for forming the cleaning medium beam Shape of an annular beam. The cleaning device 112 is also designed to cooperate with an alignment device 130. The alignment device 130 comprises a drive 132, which is coupled to the nozzle 126 in order to adjust its position and / or orientation so that a position and / or orientation of the cleaning medium jet is desirably adjustable, so that the cleaning medium jet on the Measuring device 106, in particular the measuring diaphragm 120, impinges.

The drive 132 may be formed mechanically, pneumatically or electrically and in particular be coupled via a control line 134 with the control and / or regulating device 104.

The drive 132 is preferably arranged on the holding device 122.

In particular, the alignment medium 130 can be used to adjust the cleaning medium jet vertically and / or horizontally, with respect to the direction of gravity 136 and, in particular, in predetermined or predefinable stages or steplessly manually or automatically.

The control and / or regulating device 104 is designed to detect and process the actual value of the oxygen content in the service water 108 in the storage container 60.

The measuring device 106 can in principle also be arranged at another point in the process water circuit 24, in particular also in the connecting lines 52, 56 and 76, which are connected downstream of the aeration container 42.

The control and / or regulating device 104 is designed, in particular, for comparing the measured actual value with a predetermined or predefinable setpoint for the oxygen content in the process water 108. This desired value can be input, for example, via an input device 138 interacting with the control and / or regulating device 104. In particular, the input device 138 may be a keyboard that is coupled to the control and / or regulating device 104 via a cable connection or also without contact. The input device 138 may optionally also be in the form of a mobile terminal, such as a smartphone or a tablet computer. A data exchange with the control and / or regulating device 104 can then take place, in particular, also contactlessly via a radio interface.

The control and / or regulating device 104 is designed to control the oxygen supply device 94 for supplying oxygen into it

This can be done in particular via the control of the air pump 96 in response to a difference value which between the measured actual value and the setpoint for the oxygen content in the purified and enriched with oxygen hot water 108 by the control and / or regulating device 104 calculated becomes. In particular, the difference value may be determined or calculated by comparing the actual value and the oxygen content set point in the purified and oxygenated service water 108.

The control and / or regulating device 104 may include one or more timers 140 for prescribing one or more aeration times during which oxygen is supplied to the process water 44 in the aeration tank 42. For example, an activation time or an activation of the air pump 96 can be preset via a ventilation time specified by the timer 140.

The control and / or regulating device 104 can also control the oxygen supply device 94, in particular the air pump 96 defining a delivery device, such that oxygen is activated as a function of the calculated difference value for a predefined or predeterminable aeration time and / or with a dependent on the difference value or independent volume flow. In other words, in particular, a delivery rate of the air pump 96 can also be determined as a function of the calculated difference. value be set or controlled by the control and / or regulating device 104.

The cleaning system 10 can perform with the described process water treatment system 12 in particular a process for treating domestic water in the process water circuit 24 of the cleaning system 10, in which polluted hot water 26 is collected and purified from the cleaning system 10, in which the purified process water 44 oxygen is supplied and purified and enriched with oxygen enriched process water 108 to supply it back to the cleaning system 10 if necessary, wherein an actual value of the oxygen content is not measured in the aeration tank 42, but in the purified and oxygenated hot water 108, which has already flowed out of the aeration tank 42, For example, in the storage container 60th

To avoid odor nuisance from tilted to an anaerobic state

To avoid hot water 108, an oxygen content of 2 mg / l is preferably specified as the setpoint. In order to have greater safety to avoid odor nuisance, this setpoint can also be raised to 3 mg / L or more.

FIG. 3 is a schematic diagram of a flow chart for the described method. In this method, a target value for the oxygen content in the service water 108 is input. In the storage container 60, an actual value of the oxygen content is measured. The actual value is compared with the setpoint. If the actual value is smaller than the desired value, the oxygen supply device 94 is activated. If the actual value is greater than the desired value, the oxygen supply device 94 is deactivated.

Optionally, the oxygen supply device 94 can be deactivated with a time delay, that is, in the aeration container 42 is still for the predetermined or optionally adjustable delay time over the time delay supplied with the air pump 96 oxygen as part of the pumped air to the hot water 44 contained in the aeration tank 42.

Alternatively, the comparison between the actual value and the setpoint can be made by forming a difference value between the actual value and the nominal value. If the difference value is greater than or equal to zero, the oxygen supply device 94 is deactivated. If the difference value is less than zero, the oxygen supply device 94 is activated.

Optionally, a ventilation time can be specified by the control and / or regulating device 104 as a function of an amount of the difference value.

Furthermore, a volumetric flow of the air conveyed with the air pump 96 into the aeration container 42 can also be preset as a function of the difference value or an amount thereof. The more negative and larger in magnitude the difference value, the more air per unit of time is conducted into the aeration tank 42 in order to reach the predetermined desired value in the process water 108 as quickly as possible.

Optionally, the cleaning device 112 can also be activated or deactivated with the control and / or regulating device 104. In particular, the air pump 116 may be operated continuously or intermittently so that a continuous or intermittent purge media jet impinges on the gauge 106 to clean it.

In Figure 1, a cleaning system with the service water treatment system 12 is shown in total. In Figure 2, the hot water circuit 24 is shown again schematically. In Figure 2, the same reference numerals are used as in Figures 1 and 4.

With reference to Figure 2, a special form of the embodiment of the process water treatment system 12 is explained in more detail below. It may in fact be designed in the form of a retrofit kit 142 for an existing cleaning system 10.

The retrofit kit 142 in this case comprises the measuring device 106, a measuring or connecting line 110 for connecting the measuring device 106 with a computer or a control or regulating device 104 of the cleaning system 10 and a computer program with program code means which are suitable for the end of the computer program on the computer and / or the control and / or regulating device 104, in particular, to carry out the method described in connection with Figure 3 or another of the above-described method for treating process water using the described components of the cleaning system 10 and an existing service water treatment system.

The retrofit kit 142 may in particular comprise a computer program product 144 with a computer-readable medium 146, on which the computer program is stored with program code means.

In order to be able to arrange the measuring device 106, in particular in the storage container 60, the retrofit kit optionally also includes the holding device 122.

Furthermore, the retrofit kit 142 may also include the control and / or regulating device 104 or a computer, with which the service water treatment system 12 is controllable, in particular by connecting the control and / or regulating device 104 with the air pump 96, either via control lines or suitable radio links.

Furthermore, further control and / or connecting lines or radio links for effective connection of the control and / or regulating device 104 with components of the cleaning system 10 or the process water treatment system can be included in the retrofit kit 142, in particular the control and / or regulating device 104 also with the service water - Recirculation device 92 and the pumping devices 50 and 72 to connect control effective.

The cleaning system 10 may further comprise a fresh water inlet, which fresh water directly to the cleaning chamber 18 and the cleaning brushes 20 and 22 supplies or optionally also the storage tank 60 to compensate for service water losses.

Furthermore, in the connection lines described above, as well as in the inlets and outlets, it is also possible to provide valves in a manner familiar to the person skilled in the art, which valves can be controlled, in particular manually or automatically, by the control and / or regulating device 104. With them, a hot water flow in the service water treatment system 12 can be controlled individually as required by the cleaning system 10.

The valves mentioned are not shown in the figures for reasons of clarity.

The described process water treatment system 12 allows a highly efficient operation and effectively prevents odor nuisance by tilted in an anaerobic state hot water in the cleaning system 10. Compared to systems in which the actual value of oxygen content in the aeration tank 42 is measured, the proposed measurement of the oxygen content of the purified and oxygen-enriched process water 108 in particular in the storage container 60 has the advantage that the purified process water 44 can be aerated with significantly less effort, whereby the cleaning system 10 is more economical to operate despite avoiding odor nuisance. LIST OF REFERENCE NUMBERS

10 cleaning system

12 service water treatment system

14 vehicle wash

16 motor vehicle

18 cleaning room

20 cleaning brush

22 cleaning brush

24 service water circuit

26 dirty service water

28 footprint

30 drip tray

32 connecting line

34 collection containers

36 waste water outlet

38 collection container inlet

40 overflow

42 aeration tanks

44 service water

46 float device

47 pumping device

48 breather outlet 50 filter device

52 connection line

54 first filter outlet

56 connection line

58 storage tank inlet

60 storage tanks

62 overflow

64 connection line

65 connection line

66 sewer sewage system

Speicherbehälterauslass

pumping device

connecting line

Water intake

tank

connecting line

outlet

connecting line

pumping device

second filter outlet

connecting line

Brauchwasserumwälzeinrichtung

oxygen supply

air pump

connecting line

oxygen outlet

control line

Control and / or regulating device

measuring device

water

Measurement line

cleaning device

connecting line

air pump

Oxygen measuring probe

measuring membrane

holder

admission

jet device

jet

control line 130 alignment device

132 drive

134 control line

136 Direction of gravity

138 input device

140 timer

142 Retrofit kit

144 computer program product

146 computer readable medium

Claims

claims

Domestic hot water treatment system (12) for treating process water in a process water circuit (24) of a cleaning system (10), in particular a vehicle washing system (14), in which service water circuit (24) polluted service water (26) from the cleaning system (10) is collected and cleaned, the purified industrial water (44) is supplied to oxygen and the purified and enriched with oxygen-enriched service water (108) is returned to the purification plant (10) when needed, which service water treatment system (12) comprises a measuring device (106) for measuring an oxygen content in the service water (108), so that the purified service water (44) oxygen can be supplied depending on the measured oxygen content, characterized in that the measuring device (106) is adapted to measure an actual value of the oxygen content in the purified and oxygenated service water (108) enriching with sow erstoff.

Domestic water treatment system according to claim 1, characterized in that the measuring device (106) is designed to measure the actual value in the cleaned and enriched with oxygen stored process water (108) or when supplying the stored process water (108) to the cleaning system (10).

A service water treatment system according to one of the preceding claims, characterized by a collecting container (34) for dirty service water (26) of the cleaning system (10), which collecting container (34) has a collecting container inlet (38) connected or connectable to a dirty water outlet (36) of the cleaning system (10) ) having.

4. service water treatment system according to claim 3, characterized by a with a Sammelbehälterauslass (40) of the collecting container (34) fluidly connected cleaning device for cleaning, in particular by filtering and / or by sedimentation and / or by chemical treatment and / or by biological treatment, polluted hot water from the collecting container, which cleaning device is fluidically connected to the collecting container (34).

5. process water treatment system according to claim 3 or 4, characterized by a ventilation tank (42) in which the collected polluted service water (26) or the collected and purified service water (44) oxygen is supplied, wherein the aeration tank (42) with the collecting container (34 ) is connected indirectly fluideffective directly or via the cleaning device.

6. process water treatment system according to claim 4, characterized by an oxygen supply means (94) for supplying oxygen into the process water in the aeration tank (42).

7. process water treatment system according to claim 6, characterized in that the oxygen supply means (94) in the aeration tank (42) arranged oxygen outlet (100).

8. process water treatment system according to claim 6 or 7, characterized in that the oxygen supply means (94) comprises a conveyor (96), in particular in the form of a blower, and / or that the oxygen supply means (94) comprises a compressed air network or is connected to such a fluid effective to supply pressurized air containing oxygen to the purified process water (44).

9. process water treatment system according to one of claims 5 to 8, characterized by a storage container (60) for storing the cleaned and enriched with oxygen process water (108), which storage container (60) on the one hand with the aeration tank (42) and on the other hand with the cleaning system (10) is connected fluidly effective.

10. process water treatment system according to claim 9, characterized in that the measuring device (106) for measuring the oxygen content in the storage container (60) is arranged or formed in this.

11. Service water treatment system according to one of the preceding claims, characterized in that the measuring device (106) is designed in the form of an oxygen measuring probe.

12. The process water treatment system according to one of the preceding claims, characterized by a cleaning device (112) for cleaning the measuring device (106) in response to at least one measured variable, which in particular a contamination state of the measuring device (106) and / or an operating time since a previous cleaning and / or is a water quality of the purified and oxygenated service water (108).

13. The process water treatment system according to claim 12, characterized in that the cleaning device (112) is designed to act on the measuring device (106) for cleaning with a cleaning medium beam.

14. service water treatment system according to claim 13, characterized in that the cleaning medium jet contains air or consists of air.

15. service water treatment system according to claim 13 or 14, characterized in that the cleaning device (112) is formed for forming the cleaning medium beam in the form of a spot beam, a fan beam, a cone beam or an annular beam.

16. Industrial water treatment system according to one of claims 13 to 15, characterized in that the cleaning device (112) comprises a jet device (125) for forming the cleaning medium jet, in particular in the form of a nozzle (126).

17. Industrial water treatment system according to one of claims 13 to 16, characterized in that the cleaning device (112) is designed to generate a continuous or intermittent cleaning medium jet.

18. process water treatment system according to one of claims 13 to 17, characterized in that the cleaning device (112) comprises an alignment device (130) for adjusting a position and / or orientation of the cleaning medium beam, in particular vertically and / or horizontally with respect to the direction of gravity (136 ) and / or in predetermined or predefinable stages or steplessly manually or automatically.

19. Industrial water treatment system according to claim 18, characterized in that the alignment device (130) is designed for manual or automatic alignment, in particular mechanically, pneumatically or electrically, of the cleaning medium jet to the measuring device (106).

20. Industrial water treatment system according to claim 18 or 19, characterized in that the alignment device (130) with the jet device (125) is arranged cooperatively or formed.

21. Industrial water treatment system according to one of the preceding claims, characterized in that the measuring device (106) has a measuring diaphragm (120).

22. The process water treatment system according to one of the preceding claims, characterized by a holding device (122) for positioning and holding the measuring device (106) in a storage container (60) or in a service water pipe, which fluidly connects the aeration tank (42) with the storage container (60) , or in a service water line (76), which fluidly connects the storage container (60) with the cleaning system (10).

23. Industrial water treatment system according to one of the preceding claims, characterized by a control and / or regulating device (104), which is designed to cooperate with the measuring device (106) for detecting an actual value of the oxygen content in the process water (108) measured by the measuring device (106). and for comparing the measured actual value and a predetermined or predefinable setpoint value by calculating a difference value between the actual value and the setpoint value for the oxygen content in the purified and oxygenated process water (108).

24, service water treatment system according to claim 23, characterized by a with the control and / or regulating device (104) cooperating input device (138) for inputting the desired value.

25. Industrial water treatment system according to claim 23 or 24, characterized in that the control and / or regulating device (104) is designed to control the oxygen supply (94) for supplying oxygen into the process water (44) in the aeration tank (42) in dependence of calculated difference value for a ventilation time and / or with a dependent on the difference value or independent volume flow.

26. Industrial water treatment system according to one of claims 23 to 25, characterized in that the control and / or regulating device (104) comprises at least one timer (140) for setting an aeration time, during which the service water (44) oxygen is supplied, in particular with the oxygen supply device (94).

27. Industrial water treatment system according to one of the preceding claims, characterized by a hot water circulation device (92) for circulating the process water (26, 44, 108) in the process water treatment system (12), in particular for circulating the dirty process water (26), the cleaned (44) and with Oxygenated process water (108) and / or the purified and oxygenated stored process water (108).

Domestic water treatment system according to claim 27, characterized in that the hot water circulation device (92) fluidly connected to the collecting container (34), the aeration tank (42) and / or the storage container (60) for circulating the process water (26, 44, 108) in the collecting container (34), in the aeration tank (42) and / or in the storage tank (60).

29. Industrial water treatment system according to claim 27 or 28, characterized in that the control and / or regulating device (104) is designed for controlling and / or regulating the hot water circulation device (92), in particular as a function of the difference value.

30. Industrial water treatment system according to one of the preceding claims, characterized in that the process water treatment system (12) in the form of a retrofit kit (142) for a cleaning system (10) is formed, which retrofit kit (142) the measuring device (106), at least one connecting line (110 ) for effectively connecting the measuring device (106) to a computer or a computer Control and / or regulating device (104) and a computer program with program code means, which are suitable, at the end of the computer program on a computer and / or a control and / or regulating device (104) according to one of claims 23 to 26, a method according to any one of claims 36 to 52.

31. The process water treatment system according to claim 30, characterized in that the retrofit kit (142) comprises a computer program product (144) having a computer readable medium (146) and a computer program stored on the computer readable medium (146) with program code means which are adapted to run of the computer program on a computer and / or a control and / or regulating device (104) according to one of Claims 23 to 26, to carry out a method according to one of Claims 36 to 52.

32. The process water treatment system according to claim 30 or 31, characterized in that the retrofit kit (142) comprises the holding device (122) according to claim 22.

33. The process water treatment system according to one of claims 30 to 32, characterized in that the retrofit kit (142) comprises the control and / or regulating device (104).

34. Cleaning system (10) with a hot water circuit (24), characterized by a service water treatment system (12) according to one of the preceding claims.

35. Cleaning system according to claim 34, characterized in that it is in the form of a vehicle washing system (14), in particular for mechanical and / or manual vehicle cleaning.

36. A method for treating process water (26) in a process water circuit (24) of a cleaning system (10), in particular a vehicle washing system (14), in which method contaminated service water (26) from the cleaning system (10) is collected and cleaned, in which the purified service water (44) is supplied with oxygen and the purified and oxygenated service water (108) is stored to return it to the cleaning system (10) when needed, the oxygen content in the purified process water (44) measured and the purified service water oxygen is supplied as a function of the measured oxygen content, characterized in that an actual value of the oxygen content in the purified and enriched with oxygen hot water (108) is measured.

37. The method according to claim 36, characterized in that the actual value of the oxygen content in the cleaned and enriched with oxygen stored process water (108) or when supplying the stored process water (108) to the cleaning system (10) is measured.

38. The method according to claim 36 or 37, characterized in that the purified process water (44) oxygen is supplied when the measured in the purified and enriched with oxygen process water (108) actual oxygen content is below a predetermined or predefinable setpoint for the oxygen content.

39. The method according to claim 38, characterized in that the desired value for the oxygen content is set to a value of at least 2 mg / l.

40. The method according to claim 39, characterized in that the desired value for the oxygen content is set to a value of at least 3 mg / l.

41. Method according to claim 38, characterized in that the actual value and the nominal value are compared by calculating a difference value between the nominal value and the actual value and that, depending on the difference value, the purified industrial water (44) oxygen for an aeration time, the depends on the difference value or is independent, is supplied.

42. Method according to claim 38, characterized in that the purified industrial water (44) is supplied with oxygen at a predeterminable volumetric flow when the actual oxygen content value measured in the purified and oxygenated process water (108) is below a desired value for the Oxygen content is.

43. The method according to claim 42, characterized in that the volume flow is adjusted automatically as a function of the calculated difference value or independently of the difference value.

44. The method according to any one of claims 36 to 43, characterized in that the oxygen content in the purified and oxygenated service water (108) with a measuring device (106) is measured.

45. The method according to claim 44, characterized in that the measuring device (106) as a function of at least one measured variable, which in particular a contamination state of the measuring device (106) and / or an operating time since a previous cleaning and / or a water quality of the cleaned and with oxygen enriched service water (108) is cleaned.

46. The method of claim 44 or 45, characterized in that the measuring device (106) is acted upon for cleaning with a cleaning medium beam.

47. The method according to claim 46, characterized in that the measuring device (106) is acted upon for cleaning with an air-containing or consisting of air cleaning medium beam.

48. The method of claim 46 or 47, characterized in that the cleaning medium beam in the form of a spot beam, a fan beam, a cone beam or an annular beam is directed to the measuring device (106).

49. The method according to any one of claims 46 to 48, characterized in that the cleaning medium beam is aligned manually or automatically, in particular mechanically, pneumatically or electrically, to the measuring device (106).

50. The method according to any one of claims 46 to 49, characterized in that the measuring device (106) is applied for cleaning with the cleaning medium jet continuously or intermittently.

51. The method according to any one of claims 46 to 50, characterized in that an orientation of the cleaning medium beam is adjusted vertically and / or horizontally with respect to the direction of gravity (136) in predetermined stages or continuously manually or automatically.

52. The method according to any one of claims 36 to 51, characterized in that the polluted service water (26) is purified by filtration and / or sedimentation and / or chemically and / or biologically.