SK148294A3 - Process for producing and processing wash water in a washing installation, and washing installation - Google Patents

Abstract

A process is disclosed for producing and feeding wash water in a washing installation, in particular a car washing installation (1), according to which the wash water is used in at least one washing process for cleaning a motor vehicle (28) or the like and is evacuated after each washing process. In order to use only relatively reduced amounts of wash water, the evacuated wash water is reused in an essentially closed water circuit for successive washing processes. The evacuated wash water is collected and supplied to a filtering installation or similar processing device and at least part of the filtrate generated in the processing device or pure water thus produced is supplied to at least one ulterior washing process as wash water. Also disclosed is a washing installation, in particular a car washing installation (1), with at least one spray head or similar wash water outlet (2, 3, 4, 5) which applies the wash water to a motor vehicle (28) or similar object to be cleaned. The disclosed washing installation is characterized in that it has an arrangement for collecting the wash water after each washing process, the collecting arrangement (6) is linked with at least one device for processing at least part of the collected water and the filtrate or pure water outlet (10) of the processing device is linked with at least one wash water outlet of the washing installation. The required wash water can thus be used in the disclosed washing installation in a practically closed water circuit.

Description

Process for producing purification water treatment for washing line and washing line

Technical fields

The invention relates to a process for the production and treatment of cleaning water for a washing line. in particular for a car wash where the cleaning water is used in at least one washing procedure for cleaning a vehicle or the like and after each washing procedure the water is drained. The present invention also relates to a washing line. in particular a car wash line with at least one shower head or similar cleaning water outlet intended to supply cleaning water to a vehicle or similar cleaned article.

BACKGROUND OF THE INVENTION

A number of automobile washing lines are already known in which the cleaning water is fed to the cleaned vehicle in at least one shower head or brush or similar spouts in the washing line sections or stages. In the known washing lines, the purification water is usually discharged into the sewer after each purification process. This represents a considerable water consumption and a correspondingly high effluent outflow.

SUMMARY OF THE INVENTION

Therefore, there is a task to develop, a method mentioned at 11a, which would guarantee only minimal water consumption. At the same time, we have a task to create. a car wash line or similar car wash line, in particular for implementing the inventive method. The inventive solution to this task lies in the method mentioned at the outset, in particular that the purification water after each washing procedure is used in, for further washing procedures of the nearly closed propeller circulation, that the purification water removed is

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2 being collected and fed to a filtering device or similar water treatment device, and that at least a portion of the filtrate produced in the treatment plant or pure water is fed to a further washing process as purification water. Thus, in this inventive method, the purification water is. ducted after each washing procedure reused in closed water circulation for further washing procedures. Nevertheless, in order to ensure, as far as possible, a high quality of purification water, the purification water is collected and discharged after each washing process in a water treatment plant and as pure water is fed into further washing processes. Such a preferred method envisages this. that the purification water removed and recovered as raw water is fed to the treatment plant with at least one semipermeable membrane, that portion. This raw water passes through the membrane as pure water, the driving force of which is the pressure difference and is led to the following washing procedures. and that the remainder of the raw water flowing around the membrane leaves the raw water region on the membrane as a concentrate and is recycled back to the semipermeable membrane or to another washing process where high water quality requirements are not imposed. The water treated with a semi-permeable membrane is of very high quality: due to the relatively low and reversible salt concentration, only a relatively small amount of detergents or similar chemicals can be added to the treated water, which has a favorable effect on the salinity of the water in the water. Low osmotic back pressure is also required for low operating pressure, for example, for reversible osmosis. In order to make maximum use of the purification water after filtration or treatment, it is preferable that pure water is fed into subsequent washing processes with higher demands on water quality and concentrate. is fed into washing procedures with lower water quality requirements. However, if we need a high quality of purification water for washing processes, it may be more advantageous if the residual concentrate flowing around the membrane can be added to the purification water collected after each washing process, which will be fed to the membrane as raw water. Because in the present invention the purification water is in a closed circuit

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- 3 contamination and precipitation precedes the mesh filter of the membrane modules in the flowing raw water.

used for further washing procedures, may optionally contain impurity particles. To ensure long-term operation and long lifetime of the membrane, even with high contamination of the purification water supplied to the treatment plant, it is envisaged that the flow of raw water on the membrane is reversed or changed at regular intervals. Conventional and membrane modules with semi-permeable membranes, especially wound modules, which are preferred for cost reasons, are sensitive to

In the case of such modules, it is usually downstream to prevent the membrane from being contaminated with large particles of impurities and if the raw water is heavily contaminated, the filter must be changed frequently. Nevertheless, the membranes are contaminated in particular in the direction of use. Both sides of the membrane module are used to reverse the flow direction of the purification water supplied to the membrane as raw water. This removes the dirt particles deposited on the membrane surface after the washing process, in particular on the raw water side, in the wound or similar membrane module, while the opposite part of the module forms the forward region downstream until further flow reversal. By using both sides of the module, it is possible to extend the operating time considerably, increase the lifetime of the membrane and extend the maintenance intervals of the treatment plant used in this invention. Since with each flow reversal, the more contaminated side of the module in the flow direction is temporarily a back area punctured with purification or raw water, we do not need to use otherwise normally pre-filters. which means space and cost savings. According to another proposal you should have. Self-protection assumes that by temporarily reducing or interrupting the outflow of pure water on the membrane, the pressure on the pure water side will increase. and that after increasing the static pressure on the clean water side. especially after equalizing the static water pressure on both sides of the membrane, there will be a short-term surge reduction of the static pressure in the raw water treatment plant at certain time intervals compared to the static

F'all, the shock drop

pressure on the clean water side. the static pressure in the raw water treatment plant compared to the static pressure on the raw water

Although clean water is discontinued from the production of purification or clean water, this temporary pressure change will lead to a sudden backflow of clean water from the clean water area, which in the short term showed higher static pressure to the raw water area. This backflow flushes the diaphragm walls and cleans the module at regular time intervals, thereby extending the life of the diaphragm. At the same time, we can increase the flow rate and hence the dynamic pressure of the work or clean water flowing along the membrane in order to reduce the static pressure on the raw water side. In particular, the solution of a vehicle washing line or similar washing line mentioned at the outset is that. that the wash line has a trap for collecting purification water after each washing process, that the trap is connected to a water treatment plant that treats at least a portion of the collected water, and that the filtrate or clean water outlet from the treatment plant is connected to at least one purification water outlet on the wash line. In this washing line, the purification water is not discharged into the sewer after each purification procedure, but is collected in a trap and from there it is led to the water treatment plant. In this treatment plant, at least a portion of the purification water collected after the purification processes is treated and purified and then passed through the filtrate or pure water outlet of the treatment plant to the purification water outlet. At the purge water outlet, the filtrate or the clean water that has been generated in the vehicle water treatment plant. In this washing line, the purification water circulates in a closed circuit, without the need to drain, the waste water after each washing procedure into the sewer. A preferred embodiment of the present invention contemplates that the purification water treatment plant has at least one semipermeable membrane which separates the raw water area from the clean water area in the treatment plant, wherein the clean water area of the treatment plant is connected to at least one purification water outlet. and that the raw water region is connected on the inlet side to the trap and on the outlet side to the second purification water outlet or to the semi-permeable membrane. Particularly in a water treatment plant having at least one lobster and an epustemic membrane, it is possible to produce, at low cost, clean water with a relatively low content of impurity particles, and to use this water as a purification water in this line. If we can use it as a cleanser

- 5 pure water produced in the treatment plant should be. reused as purification water. can be. expediently, the raw water area in the treatment plant will flow into the return line of the concentrate flowing along the membrane in the direction of outflow in the treatment plant. In this way, the concentrate, in the trap, is mixed with the purification water removed from the individual washing procedures and again. is led to the treatment plant. In particular, if the purification water discharged after the individual washing procedures and collected in the trap is first cleaned by sedimentation, flooding or filtration using a filter unit, for example in a treatment plant, it will be advantageous for the purification water discharges associated with the clean water area in the treatment plant to be used for washing processes or stations with high purification water quality requirements and purification water effluents associated with a raw water area for washing processes or stations with low water quality requirements. In this case, it is possible to use, for the first or main washing, concentrates flowing out of the raw water area associated with the purification water outlets. A further modification of the present invention is that it has at least two semi-permeable membranes, one of which is assigned to the first treatment stage and the other to the second treatment stage, so that the raw water area of the first treatment and outlet side of the treatment plant is connected to the trap and clean water area was connected to the raw water area in the second treatment stage, and that the clean and raw water area in the second treatment stage on the discharge side leads to at least one purification water outlet. In such a two-stage water treatment plant, the pure water or permeat produced in the second stage of the treatment plant has a very low salt content, although the purification water fed to the treatment plant as raw water initially had a very high salt content. Likewise, the concentrate flowing along the membrane in the second stage of the treatment plant is of high quality compared to the pre-treated water and can be used very well for the first or main washing in this washing line. In order to ensure long-term operation and long lifetime of the membrane in the washing line, even in the case of cleaning water heavily contaminated by previous washing procedures, and to keep the cleaning water cycle as long as possible, it is advantageous to reverse the flow direction of water flowing along the membrane in the raw side water by means of a reversing device, and if the treatment plant apertures will be used for this purpose at certain time intervals such as water inlet and outlet. these openings lead to the raw water region of the membrane. Another characteristic of the invention will be apparent from the following description of exemplary embodiments in conjunction with the claims and the drawing. The individual symptoms may be realized individually or may be realized, several in one embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

This is shown in the figure, which is largely schematic:

Fig. 1 Car wash line with water treatment plant. wherein the clean water area is connected to four purification water outlets and the raw water area leads to a collecting device designed as a collection tank.

Fig. 2 A washing line similar to FIG. 1, in which one part of the purification water outlet is connected to the clean water area of the treatment plant and the other part of the purification water outlet is connected to the raw water area.

Fig. 3 A washing line in which the direction of flow of water flowing along the membrane on the raw water side of the treatment plant is reversed by means of a flow reversing device.

Fig. 4 Washing line with a two-stage water treatment plant.

DETAILED DESCRIPTION OF THE INVENTION

Figure 1 shows a washing line 1 having unspecified washing heads, scrub brushes or similar cleaning water discharges 2-5 per wash. These cleaning water outlets 2 - 5 are intended for supplying cleaning water to the vehicle e.g. for the first wash (outlet 2), main wash (outlet 3), wax application (outlet 4) and rinsing (outlet 5). In order to collect the purification water after each washing process, the washing line also has a scavenger device C6), which is designed as a deep sedimentation and collection tank. In this scavenger, the purification water collected after the scrubbing processes is collected. where larger dirt particles settle at the bottom of the tank and oil and other light substances on the surface of the purification water. The catching device 6 is connected via a conveying pump 7 and the inlet pipe 8 to a water treatment plant 9 in which the water is discharged after the washing processes and collected in the catching device g for treatment, purification and ready-to-clean water for further washing processes. Therefore, the filtrate, permeation or pure water outlet 10 from the collecting device 9 is connected to each purification water outlet 2-5 in the washing line 1- As shown in Figure 1, the delivery pump 7 or the inlet mouth of the supply line 8 is located in the region of the collecting device 6 as a collection tank located at the bottom of the collecting device above the settled dirt particles and under the light substances floating on the surface of the water. The gripping device 6 located below the outlets 2-6 is covered by a grille 27 or a similar water-permeable cover over which vehicles can pass. With the corresponding equipment, the interception device 6 can also be located outside the vehicle path. The water treatment plant 9 in the washing line 1 according to FIG. 1 has a semipermeable membrane 11 which separates the raw water area 12 of the treatment plant from the pure water area. As shown in FIG. 1, the raw water area 12 of the inlet side treatment plant 9 is connected to the collecting device 6 via line 8 and, at the outflow line, also flows into the collecting device 6, where the concentrate is mixed with the discharged purification water and that is again. In this way, the removed cleaning thread is used for further washing processes in a practically closed water circulation. so it doesn't have to be. no waste water is drained from the individual washing procedures on the bottom of the sewer and must be. only a small part is added. Purification water due to evaporation or similar leakage.

Figure 2 shows a washing line 14 having a similar construction to the washing line 1 in Figure 1. Also in the washing line, the catching device 6 is designed as a collection tank connected to a water treatment plant 9 which has a semi-permeable membrane 11. the thicker particles are deposited in the dirt trap 9, the finer particles are trapped by the mesh filter 15 in the inlet pipe 8 before the treatment plant 9. This first cleaning makes it possible to use the concentrate flowing on the side along the membrane 11 water. The raw water area 12 is connected to both purification water outlets 3.

The raw water area 12 is washed, with the outflow side 4 on the other hand. 2 to the other two cleaning water outlets 4.5 for wax application and rinsing, since these washing procedures place greater demands on the quality of the cleaning water.

The water treatment plant 9 of the described washing lines is supplied with captured purification water under operating pressure by the conveying pump 7 at the pure water production stage and this operating pressure is higher than the osmotic back pressure in the region of the membrane 11 or membranes. By driving the pressure difference on the clean water side, the purification water supplied to the treatment plant 9 as raw water can pass through the membrane as pure water, while the remaining raw water leaves the raw water area 12 at the membrane 11 as a concentrate. The water treatment plants 9 described herein are operated by a reversible osmosis technique illustrated by a washing line 16, which the treatment plant cleans at certain time intervals,

In Figure 3, 9 is automatically in order to ensure a regular circulation of purification water for a long time. Both openings or pipes 17, 18 of the treatment plant 9 leading to the raw water region 12 of the diaphragm 11 are connected to a water pipe 19, 20, which is connected to the inlet and outlet of the auxiliary multi-way valve 21, 22. 20 connected to the inlet pipe 11 and the conveying pump 7, while the pipe sections 19b, 20b directed from the openings or pipes 17 18 return to the collector 6 via the multi-way valve 22 and the multi-way flow valves 21, 22. which allows a common return line 23. Both are part of the reversing device, reversing the direction of raw water flow.

flowing along the membrane 11 at certain time intervals. Through this reversal of the flow direction, the openings 17, 18 of the treatment plant 9 leading into the raw water region 12 alternate at certain intervals as a water inlet or outlet. so that each of the raw water side end regions in the treatment plant represents a temporary inlet end area, loaded to a greater extent by impurity particles, while the raw water outlet area can be flushed. In this way, even when the cleaning water is very dirty, it is possible to ensure even use of the membrane 11 and its longer service life. which favorably affects the continuous circulation of the purification water in the washing line 16. In order to supply raw water in the raw water region 12 in a certain direction towards the membrane

11. connects the multi-way valve 21 to the line section 20a and the line section 19b is connected via the valve 22 to the return line 23. Raw water flowing to the diaphragm flows in the opposite direction if the multi-way valve 21 connects the line 3 to the line section 19a and the multi-way the valve 22 connects the pipe section 20b to the return pipe 23. In order to flush and clean the membrane 11 in the treatment plant 9 of FIG. 3, by briefly flushing, there is the possibility of briefly and suddenly reducing at certain time intervals the static water pressure on the raw water side 12 in the treatment plant 9 as compared to the static pressure on the clean water side 13. In the water production phase, there is an inverse ratio of static pressure in the raw and clean water area at the treatment plant 9. pure water is transferred from the clean water area 13 to the raw water area 12 and cleans the membrane 11. This means that when purifying the treatment plant 9 of FIG. 3, the valves 21, 22 and the shut-off valve 24 associated with the clean water outlet 10 are closed, thereby approximately equalizing the water pressure on both the raw and clean water side 12, 13 of the diaphragm 11. If at this time the valves 21, 22 in both flow directions open. According to the equation against static pressure on the net of pure water 13, the static pressure of the water on the raw water side will be lower, allowing the membrane to be pierced with pure water. To reduce the static water pressure on the raw water side 12, it is possible to increase the flow rate and thus the dynamic pressure of the raw water flowing in one of the blades 11 to the membrane. Particularly at a high salt content in the trapped purification water, it is advantageous for the treatment plant 9 in FIG. 3, pure water or low salt water to be flushed with the opposite flow direction will be fed for a short time as the raw water, especially during a short-term drop in the static water pressure on the raw water side 12 as compared to the water pressure on the clean water side. It is preferred that the time intervals for reversing the flow direction or changing the pressure on the membrane or the values of the pressure change on the membrane 11 are selected depending on the degree of contamination of the purification water collected after the washing procedures and fed to the treatment plant 9 as raw water. In FIG. 3 it is stated that between the clean water area 13, the clean water outlet shut-off valve 24 there is an auxiliary tank connected to the clean water area 13 in the treatment plant 9, preferably without a check valve. which provides a larger amount of pure water or permeation for flushing the membrane when flushing. Very efficient flushing can be achieved if the shut-off valves are designed as ball valves or a similar quick-closing fitting which favorably affects the pressure change in the region of the diaphragm 11. As shown in FIG. 3, it is not necessary to place a strainer or other filter common to the reversible osmosis technique prior to the treatment plant 9, since the treatment plant 9 and its membrane 11 are cleaned at certain intervals by reversing the flow direction and pressure reversal on the raw and clean water side 12. 9 can be further prevented by adding chemical alluvia, adsorbents or absorbing agents such as activated carbon in the powder downstream of the membrane to the downstream raw water, which will absorb some of the impurities, and remain in reverse flow direction upstream of the membrane. As washing lines 1, 14 and 25, the treatment line 9 of the washing line 16 in FIG. 3 a conventional wound module that can be. placed in the housing of the treatment plant 9 and which is connected to the inlet and outlet pipes, which is not shown in this figure. In the annular gap between the winding module and the housing of the device there is a seal which seals in only one direction of flow and is permeable in the opposite direction. In this way, the raw water is also flushed and cleaned with a circular gap between the cleaned circular wound module and the housing of the device. if the raw water flows through the treatment plant 9 in the appropriate direction. Advantageously, at least one flow fulfills the function of Figure 4, said two steps being provided with a front wall of the wound module in the direction of the alluvial or auxiliary filter. For a washing line 25 of which the treatment plant 9 and each stage has a wound module or semi-permeable membrane 11a. 11b - The membrane 11a is in the first stage of treatment and the membrane 11b is in the second stage. The raw water area 12 in the first treatment stage is connected at the inlet and outlet to the catcher 6 of the washing line 25 and the clean water area 13 is connected to the raw water area 12 in the second treatment stage to the membrane 11b. The clean and raw water area of the second treatment stage is connected on the outflow side with purification water outlets 2-5, wherein the purification water outlets for the first and main wash 2, 3 are associated with a raw water area 12 and purification water outlets for wax deposition and rinsing 4 5 are connected to the clean water area of the second treatment stage. Even at high entrapment after wash 9, it exhibits permeation. or very low salt content by the concentration of salt in the water processes and fed to the water purification plant after the second treatment stage as well as the concentrate of this second treatment stage is of substantially better quality compared to filtered water. Embodiments 14 illustrate embodiments whose treatment plants 9 have clean water production sized to meet the actual need for cleaning water of the washing lines 14, 16 and 25. without the need to store the permeat treated in the treatment water treatment plant 9 or concentrate flowing into the membranes 11 in the auxiliary tank. In order to avoid the need to adjust and size the treatment plant to the peak power required rarely, it is preferable to collect the purification water supplied to the treatment plant or the clean water produced in the auxiliary tank. amount of cleaning water. Especially in the disclosed embodiments, which operate using the reversible osmosis technique, purified cleaning water or pure water has a relatively low salt content, and therefore only a small amount of detergent or similar chemicals is needed. Due to the low osmotic back pressure, the minimum salt content of the purification water supplied to the treatment plant 9 requires only a low operating pressure at reversible osmosis, which meets the requirement for simple purification water production in a practically closed water circulation.

Claims (23)

PATENT CLAIMS Method for producing and preparing cleaning water for a washing line, in particular for a car wash line, according to which the cleaning water is used in at least one washing procedure for cleaning a vehicle and is drained after each washing procedure, characterized in that in each washing process it is practically used in a closed water cycle for further washing processes that the discharged purification water is collected and fed to a filtering device or similar treatment plant (9) and that at least a portion of the filtrate or pure water produced in the treatment plant (9) is supplied in at least one washing process as purification water. The method according to claim 1, characterized in that. The purification water being discharged and collected is supplied as raw water to the treatment plant (9) with at least one semi-permeable membrane (11) so that a portion of this raw water passes under the pressure differential driving force of the membrane (11) as pure water. and that the remainder of the raw water flowing along the membrane (11) leaves the raw water area (12) as a concentrate and is recycled to the semipermeable membrane or to the subsequent washing process with predominantly lower water quality requirements. The method according to claim 1 or 2, characterized in that the pure water is fed into further washing processes with higher water quality requirements and the concentrate is fed into the washing processes. where, on the contrary, there are lower demands on water quality. Method according to claim 1 or 2, characterized in that the residual amount of concentrate flowing along the membrane (11) is added to the purification water collected after the washing procedures and is again fed to the membrane (11) as raw water. Method according to one of claims 1 to 4, characterized in that the direction of flow of the raw water flowing along the membrane (11) is reversed or changed at certain time intervals. Method according to one of claims 1 to 5, characterized in that the temporary reduction or interruption of the outflow of pure water on the membrane (11) causes an increase in the static water pressure on the pure water side (13) of the membrane (11) and pressure on the clean water side (13), especially after equalizing the static pressure on both sides of the diaphragm (11), the static water pressure on the raw water side (12) in the treatment plant (9) decreases briefly at certain intervals compared to the static water pressure on clean water side (13). Method according to any one of claims 1 to 6, characterized in that the flow rate of the raw water flowing along the membrane (11) is increased in order to reduce the static water pressure on the raw water side (12). Method according to any one of claims 1-7, characterized in that the raw and clean water runoff is shortened or intermittently at the intervals of the membrane (11) at certain time intervals, and that the open or raised runoff occurs before opening or increasing the clean water runoff. the raw water outlet of the diaphragm (11) in the opposite flow direction compared to the raw water flow direction before reducing or interrupting the outflow on the diaphragm (11). Method according to one of Claims 1 to 8, characterized in that the time intervals intended for reversing the flow direction or for changing the water pressure on the membrane (11) or for size. the water pressure variations on the membrane (11) are selected depending on the degree of contamination of the captured purification water which is fed to the treatment plant (9) as raw water. Method according to one of the claims 1-9, characterized in that pure water or water with a lower salt content is supplied to the treatment plant (9) for occasional flushing as raw or feed water compared to the raw water used up to now and with the opposite flow direction especially during the short-term decrease of the static water pressure on the raw water side (C12) compared to the static water pressure on the pure water side (C13). Method according to one of claims 1-10, characterized in that chemical alluvial agents, adsorbent agents or absorbent agents are added to the raw water downstream of the membrane (11). Method according to one of claims 1-11, characterized in that the method for producing pure water is a method of reversing another osmosis. Washing line, in particular a car wash line with at least one shower head or similar cleaning water outlet, intended for supplying cleaning water to a vehicle or a similar article to be cleaned, wherein the washing line is intended in particular for carrying out the method according to claims 1-12 characterized in that the washing line has a trap (6) for collecting purification water after each cleaning process, the trap (6) being connected to a treatment plant (9) for treating at least a portion of the collected water. and that the filtrate or pure water outlet (CIO) in the treatment plant ¢ 9) is associated with at least one purification water outlet ¢ 2. 3, 4, 5) in the wash line. Washing line according to claim 13, characterized in that. that the treatment plant has at least one semi-adhesive membrane ¢ 11) which separates the raw water area ¢ 12) from the pure water area in the treatment plant ¢ 9). wherein the clean water area f 13) of the purification water treatment plant 9) is connected to at least the first purification water outlet ¢ 4, 5) and the inflow side raw water area is connected to the trap (6) and at least to the drain outlet at least with a second purification water outlet (2, 3) or this region leads to a semipermeable membrane (11). Washing line according to claim 13 or 14, characterized in that. that the raw water region (12) in the treatment plant (9) flows into the concentrate return line flowing along the membrane (11) on the outlet side of the treatment plant (9). Washing line according to one of Claims 13-15, characterized in that. that the purification water outlets (4.5) associated with the clean water area (13) in the treatment plant (9) are intended for washing procedures or washing stations with higher water quality requirements and purification water outlets (2.3) associated with the raw water area (12) are designed for washing procedures or washing stations with lower purification water quality requirements. Washing line according to one of claims 13-16, characterized in that. that the treatment plant has at least two semi-permeable membranes (11a, 11b), one membrane (11a) being assigned to the first treatment stage and the other membrane (11b) to the second treatment stage to provide the raw water region (12) of the first treatment stage both on the inflow side so that on the outflow side it is connected to the collecting device (6) and the clean water area (13) of the treatment plant is connected to the raw water area (12) of the second treatment stage and that the clean water area (13) and the raw water area (12) of The discharge side treatment stage was associated with at least one purification water outlet (2, 3, 4, 5). 1H. The washing line according to one of claims 13 - 17, characterized in that the direction of flow of water flowing along the raw water-side membrane (11) in the treatment plant (9) can be reversed. flow reversing device, and that the openings of the device (17. 18) leading to the raw water region (12) in the treatment plant (9) can be used alternately as water inlet and outlet after certain time intervals. Washing line according to one of Claims 13 - 18, characterized in that. that for alternating treatment and changing the water pressure in both the raw and clean water areas in the water treatment plant (9) it is possible to control the clean water outlet (10) and the openings of the device (17, 18) leading to the raw water area (12) a valve or similar shut-off or regulating member (21, 22, 24). Washing line according to claim 19, characterized in that. The shut-off and regulating bodies are designed as ball valves or similar quick-acting valves. Washing line according to one of the claims 13 - 20, characterized in that an auxiliary container (26) connected to the zone is arranged between the clean water region (13) of the membrane (11) and the clean water outlet shut-off valve (24). pure water (13) of the water treatment plant (9) without using a non-return valve. Washing line according to one of claims 13 to 21, characterized in that the treatment plant (9) has at least one winding module as a semi-permeable membrane (11) and that at least one end face of the winding module serves primarily as an alluvial or pre-filter. Washing line according to claim 22, characterized in that. that the water treatment plant (9) has a device for accommodating a wound module, the interior of which is connected to a pipe for the inlet and outlet of raw or feed water, and that an annular gap between the wound module and the housing The winding module which seals the annular gap in only one flow direction and is permeable in the opposite flow direction.