DE102019108120A1 - Storage / infiltration system and method for the intermediate storage of a fluid in a storage / infiltration system - Google Patents

Abstract

The invention relates to a storage / infiltration system (10) for a fluid (14), comprising a storage / infiltration stage (12) and a cleaning stage (18), the storage / infiltration stage (12) being designed to carry the fluid ( 14) to be taken up for intermediate storage and to be discharged for infiltration into a soil (16) surrounding the storage / infiltration system (10), into a sewer network or into a drainage system, the cleaning stage (18) being designed to convey the fluid (14) to clean of foreign matter (20) before the fluid (14) is taken up by the storage / infiltration stage (12), characterized in that the cleaning stage (18) is integrated into the storage / infiltration stage (12) or that the storage / Infiltration stage (12) is integrated into the cleaning stage (18). The invention also relates to a method for the intermediate storage of a fluid (14) in a storage / infiltration system (10), the storage / infiltration system (10) comprising a storage / infiltration stage (12) and a cleaning stage (18), and the The cleaning stage (18) is integrated into the storage / infiltration stage (12) or the storage / infiltration stage (12) is integrated into the cleaning stage (18), comprising the steps:
- cleaning the fluid (14) from foreign substances (20) in the cleaning stage (18),
- Intermediate storage of the fluid (14) in the storage / infiltration stage (12) and
- Dispensing of the fluid (14) to a soil (16) surrounding the storage / infiltration system (10) or into a sewer network.

Description

The invention relates to a storage / infiltration system for a fluid, preferably for rainwater.

The invention also relates to a method for the intermediate storage of a fluid in a storage / infiltration system.

For the intermediate storage and infiltration of rainwater, trenches are often used in practice, which contain distribution pipes and are filled either with gravel or with infiltration devices (hollow bodies). Modern storage / infiltration systems often contain modular hollow bodies, which together form the static retention of the container and, depending on the application, are encased with an open-pored membrane, for example a nonwoven (infiltration system) or foils (storage system). Due to their design, these hollow bodies contain a large number of different struts that serve to absorb or dissipate forces. They are often designed as boxes that can be laid or fastened one on top of the other and one above the other, which together form the supply channels and the required cavity for the rainwater. They are usually so stable that the area above them can be used as a roadway or parking lot.

Such storage / infiltration systems are sensitive to contamination from solid deposits and the entry of oil or other light liquids. The infiltration systems are equipped with a coating made of water-permeable material (open-pored membrane) through which the temporarily stored rainwater can infiltrate into the ground in a defined amount and speed. If a corresponding amount of dirt is brought into the system by a rain event, solids are deposited as sediment. As a result, after a short time, the water-permeable sheathing becomes so kolmatized that water can no longer run off or only to a limited extent.

In the case of a storage system that is equipped with a watertight, tight casing, the storage unit gradually silts up over its entire base area until the entire storage volume is blocked. Since storage tanks are generally used for retention and time-delayed discharge, the blockage disrupts the drainage and storage function and significantly reduces the performance of such a system.

A cleaning of the storage / infiltration systems is hardly or not at all possible in practice due to the structural design through the hollow body with numerous struts.

Based on this situation, it is an object of the invention to provide a storage / infiltration system and a method for the intermediate storage of a fluid which remains functional over the long term.

The object is achieved by the features of the independent claims. Advantageous refinements are given in the subclaims.

According to the invention, the object is achieved by a storage / infiltration system for a fluid, comprising a storage / infiltration stage and a purification stage, the storage / infiltration stage being designed to receive the fluid for intermediate storage and to infiltrate it into a storage tank. Soil surrounding the infiltration system, into a sewer network or into a drainage system, the cleaning stage being designed to clean the fluid from foreign matter before the fluid is absorbed by the storage / infiltration stage, and the cleaning stage being integrated into the storage / infiltration stage or where the storage / infiltration stage is integrated into the cleaning stage.

An essential aspect of the invention is the cleaning stage, which in a first variant is integrated into the storage / infiltration stage. In a second variant, the storage / infiltration stage is integrated into the cleaning stage. The cleaning stage removes foreign matter from the fluid before it is absorbed by the storage / infiltration stage. This protects the storage / infiltration system from colmation or blockage and the storage / infiltration system remains efficient over the long term. Because the cleaning stage is integrated into the storage / infiltration stage, or that the storage / infiltration stage is integrated in the cleaning stage, the storage / infiltration system does not require any increased space. Furthermore, in comparison to a storage / infiltration system with a non-integrated cleaning stage or non-integrated storage / infiltration stage such as an upstream cleaning stage, the operating and investment costs are lower. The integration of the cleaning stage or storage / infiltration stage also results in a significant reduction in the installation effort. The cleaning stage is preferably integrated into the storage / infiltration stage.

The storage / infiltration system, also called buffer storage, is therefore particularly suitable for intermediate storage or infiltration of Suitable for rainwater. In principle, the storage / infiltration system can also be used in addition to an upstream cleaning device. In this case, there is an overall higher cleaning performance, especially for fine particles that can be deposited and filtered off.

In a preferred development of the invention, the storage / infiltration system comprises an inlet that feeds the fluid to the cleaning stage. In order to effectively protect the storage / infiltration system from colmation, the fluid is fed to the cleaning stage via an inlet. The inlet can comprise, for example, a channel, an inlet shaft or a sewer system. It can be provided that the storage / infiltration system is connected to the sewer network of a municipality.

In a preferred development of the invention, the storage / infiltration system comprises a post-cleaning stage which is designed to clean the fluid from further foreign substances after it has been discharged from the storage / infiltration stage. This post-cleaning stage cleans the fluid before it is introduced into the ground, the sewer network or the drainage water to seep away. Particularly preferably, the post-cleaning stage is also integrated into the storage / infiltration stage. Because the post-cleaning stage is integrated into the storage / infiltration stage, the storage / infiltration system does not require any increased space. The post-purification stage is more preferably a biofiltration stage.

In principle, the storage / infiltration system for the intermediate storage of the fluid can comprise a tank with a drain. In a preferred development of the invention, however, it is provided that the storage / infiltration system comprises one or more hollow bodies that keep a volume in the ground free. Storage / infiltration systems are usually installed underground in built-up areas, for example streets or parking lots. Due to the overbuilding, the static loads on the storage / infiltration system are very high. In order to withstand these loads, the hollow bodies have lattice-like struts and / or supports. This results in a high level of strength of the overall system, which allows for building over. The hollow bodies can be flushed through or around the fluid due to the holes. The storage / infiltration system and / or the hollow body can be equipped with a casing made of fluid-permeable material, through which the temporarily stored fluid can infiltrate into the ground in a defined amount and speed. The fluid-permeable material can be a fleece or a fluid-permeable, open-pored membrane.

In order to clean the fluid from foreign substances, a preferred development of the invention provides that the cleaning stage is designed to clean the fluid from solids, light liquids and / or dissolved substances. When it rains, a lot of foreign matter, both solid and dissolved, is carried into the storage / infiltration system from the surface. Some of the foreign matter was organic material, e.g. Leaves, bark and pollen, as well as inorganic material such as e.g. Sand, rock and a wide variety of heavy metals such as copper, zinc or lead. Heavy metals can occur in precipitation water in dissolved form, but above all in particulate form. Road traffic in particular, with its entry from e.g. the abrasion of tires or brake systems as well as light fluids such as mineral oil hydrocarbons (MKW) and polycyclic aromatic hydrocarbons (PAH), for a large part of the foreign substances contained in rainwater. Furthermore, a large number of different substances from industry and agriculture are entered into the storage / seepage system with the rainwater. The cleaning stage is designed to clean the fluid from these foreign substances. The foreign matter is removed before the fluid is absorbed by the storage / infiltration stage.

Solids can be cleaned from the fluid, for example, by means of density separation. This results in a floating of substances that have a lower density than the fluid, while substances with a greater density sink and settle. Another way of separating solids is filtration. When it comes to filtration, a distinction is made between depth filtration and cake filtration. In the case of depth filtration, the solids are separated inside the filter material, with the solids contained in the fluid being adsorptively attached to the filter medium. While in cake filtration, solids are first deposited on a filter fabric due to their diameter. This is followed by further solids separation on and in the filter cake that is being formed.

The cleaning of the fluid from light liquids such as mineral oil hydrocarbons, oils and gasoline can also be carried out by means of density separation. With a suitable construction on baffles, the fluid that is heavier than the light liquids can be passed on and the separated light liquids remain in the separating device. Another option for separating light liquids is to use a coalescence separator. This is where the adherence and thus the separation of Light liquids on a corresponding fine-meshed coalescing fabric.

The removal of dissolved substances from the fluid can take place by means of sorption. During sorption, dissolved substances from the fluid are deposited on the surface of a sorption material. Both organically dissolved substances and inorganically dissolved substances such as heavy metals can be removed by means of sorption. Furthermore, an ion exchange surface can also be used to remove dissolved substances, the removal of the dissolved substances being based on an ion exchange process. For example, when heavy metals accumulate on the ion exchange surfaces, calcium ions can be released from the ion exchange surface.

For the purpose of cleaning the fluid from foreign substances, a preferred development of the invention provides that the cleaning stage comprises several sections, the sections each having a maintenance option. Due to the fact that the foreign matter is a mix of different types of contamination, the cleaning stage comprises several sections which, in combination, clean the fluid from the foreign matter. With regard to their cleaning performance and cleaning principle, the sections can be tailored to the expected foreign matter. Different physical and chemical-physical mechanisms of action can be used. Due to the modular structure of the cleaning stage, the storage / infiltration system is very flexible and can meet different requirements. Each section has a maintenance facility so that access for maintenance of the sections is guaranteed. For example, a maintenance opening can be provided for each section or maintenance of a section can be carried out via the inlet or outlet of the section. For example, the retained solids can be sucked off or removed thanks to the maintenance option. Furthermore, due to the maintenance option, a filter membrane can also be replaced, for example.

In this context, a preferred development of the invention provides that the cleaning stage comprises a sedimentation section, a sorption section and / or a membrane filter section. The sedimentation section is designed to retain sedimentable solids. The solids settled in the sedimentation section as sediment on the bottom of the section. The maintenance option allows the sediments to be sucked off or removed during maintenance.

The sorption section is designed to retain light liquids and extremely fine particulate solids, preferably in the size range of less than 1 μm, particularly preferably in the size range of less than 0.63 μm, and dissolved substances. In addition, the sorption section serves to separate the sedimentation section from the membrane filter section, so that no coarser or less in quantity foreign substances reach the membrane filter section, which then have a negative effect on the service life. In principle, the sorption section can comprise a filter layer, for example a sorption substrate for removing heavy metals. However, the sorption section is preferably constructed in several layers in order to meet different requirements. For this purpose, the sorption section is made up of multiple layers of different filter layers. The sorption section comprises, for example, a layer of coalescence fabric, a layer of sorption fabric and an ion exchange surface. In particular, it is provided that the sorption section can be checked and / or replaced by the maintenance option. Alternatively, it can be provided that a sorption section is also integrated in the sedimentation section. For example, an oil separator can be integrated in the sedimentation section. In the downstream sorption section, for example, a further separation of light liquids can then take place by means of coalescing fabric. As a further alternative, it can be provided that the sorption section is also connected downstream of the storage / infiltration stage. This should then enable, for example, a more extensive biological treatment of the fluid by means of biofiltration.

Furthermore, the cleaning stage can comprise a membrane filter section in order to remove further foreign substances by means of a membrane. The membrane should be designed in such a way that foreign substances which cannot be removed by sedimentation and / or filtration are effectively removed from the fluid. In particular, the foreign matter in the size range of less than 0.63 µm. The pores of the membrane must therefore be designed in such a way that foreign substances in the size range of less than 0.63 µm can be deposited. However, the separated foreign matter must not lead to a blockage, i.e. an excessive hydraulic influence on the membrane. Cleaning, preferably by flushing, must also be possible.

The cleaning stage particularly preferably comprises a sedimentation section, a sorption section and a membrane filter section.

In a preferred development of the invention it is provided that the cleaning stage is designed to fall dry and / or that the cleaning stage is designed to discharge the fluid essentially completely to the storage / infiltration stage. If the cleaning stage falls dry means that the cleaning stage does not have to be permanently flooded for its cleaning function, i.e. it does not have to be permanently filled with fluid. The cleaning stage therefore essentially completely releases the fluid to the storage / infiltration stage. This results in aerobic conditions in the cleaning stage, so oxygen is supplied to the foreign substances that are retained by the cleaning stage during the cleaning process. For example, there is a supply of oxygen to the coarser solids that are retained by the sedimentation section. The aerobic conditions improve the biological degradation and biological conversion of the foreign substances in the cleaning stage. Drying the cleaning stage is particularly important for the biological degradation of light liquids such as oils, fats and all other hydrophobic organic materials. While these float on the fluid and are therefore difficult to reach for the microorganisms that are responsible for the breakdown, the hydrophobic materials lay down as a film over the retained solids and the filter fabric when they dry out. This increases the contact area between the microorganisms responsible for degradation and the light liquids, which promotes degradation. In addition, the falling dry causes a negative pressure due to the falling fluid level, which supplies the retained solids with atmospheric oxygen in order to further support the aerobic biological degradation. The drying of the cleaning stage is in particular independent of the amount of foreign matter that has already been retained. The cleaning stage particularly preferably falls dry over the membrane filter section. For this purpose, the membrane filter section is arranged in such a way that this is possible hydraulically. Since the membrane of the membrane filter section has a filter effect, the cleaning effect remains independent of the fluid level, even if the cleaning stage falls dry.

The cleaning stage is not only designed to fall dry while maintaining its function, but according to a preferred development of the invention it is also provided that the cleaning stage is designed to receive the fluid for intermediate storage. This leads to the fact that, despite the integration of the cleaning stage in the storage / infiltration stage, essentially the same storage volume is available as in a storage / infiltration system with comparable dimensions and without a cleaning stage or a non-integrated cleaning stage. Essentially the same storage volume is guaranteed by the fact that the cleaning stage falls dry and fills up again with the fluid when it rains again. The volume of the cleaning stage is therefore also available as a retention volume for intermediate storage, without the cleaning ability being lost as a result.

In order to ensure that no foreign substances that are already in the cleaning stage are released and thus entered into the storage / infiltration stage, a preferred development of the invention provides that the cleaning stage is designed in such a way that the foreign substances from the cleaning stage be held back. In particular, this is understood to mean a sustained retention of the foreign matter. The cleaning stage is designed in such a way that a renewed entry of fluid does not lead to a remobilization of the previously sedimented solids or a renewed dissolution of the adsorbed substances. Remobilization is also prevented during drying out in order to prevent the foreign matter from being transported on. The sorption section connected upstream of the membrane filter section preferably ensures that foreign substances from the sedimentation area do not get into the membrane filter section during the drying process.

In this context, a preferred development of the invention provides that flow-inhibiting structures are provided in the inlet and / or in the cleaning stage. The inlet and / or the cleaning stage are therefore equipped with mechanical or structural elements that reduce the flow of the fluid. This ensures that the flow is low enough so that foreign substances in the cleaning stage, in particular solids that have already settled, do not remobilize. The flow-inhibiting structures have an influence on the flow geometry of the cleaning stage, for example, so that there is a defined flow without turbulence. The flow-restricting structures can be, for example, flow separators, baffle walls, diving or mud walls. These internals serve the hydraulic and qualitative optimization of the feed and / or the cleaning stage. Furthermore, obstacles can be provided in the inlet and / or in the cleaning stage which inhibit the flow rate of the fluid. These can be grooves, elevations, depressions or similar roughness.

The possibility of drying out applies not only to the cleaning stage but also to the post-cleaning stage. In a preferred development of the invention, it is provided that the Post-cleaning stage is designed to fall dry and / or that the post-cleaning stage is designed to release the fluid essentially completely to the ground, the sewer network or the receiving water. In a preferred development of the invention, it is also provided that the post-cleaning stage is designed to receive the fluid for intermediate storage. With regard to the advantages and technical effects, reference is made to the above sections on the cleaning stage.

• - Reinigen des Fluids von Fremdstoffen in der Reinigungsstufe,
• - Zwischenspeichern des Fluids in der Speicher-/Versickerungsstufe und
• - Abgeben des Fluids an ein das Speicher-/Versickerungssystem umgebendes Erdreich oder in ein Kanalnetz.

According to the invention, a method for the intermediate storage of a fluid in a storage / infiltration system is also specified, wherein the storage / infiltration system comprises a storage / infiltration stage and a cleaning stage, and the cleaning stage is integrated in the storage / infiltration stage or the storage / infiltration stage is integrated into the cleaning stage, comprising the steps:

• - cleaning the fluid of foreign matter in the cleaning stage,
• - Intermediate storage of the fluid in the storage / infiltration stage and
• - Delivery of the fluid to a soil surrounding the storage / infiltration system or into a sewer network.

The fluid is cleaned of foreign matter before it is temporarily stored in the storage / infiltration stage and then released into the surrounding soil or into a sewer network. The method according to the invention effectively protects the storage / infiltration system from colmation and remains efficient in the long term.

In a preferred development of the invention, it is provided that the cleaning of the fluid from foreign substances in the cleaning stage comprises cleaning the fluid from solids, light liquids and / or dissolved substances. The method thus cleans the fluid from various foreign substances. As a result, the method can be used very flexibly, since it can be adapted to the foreign matter to be expected. Furthermore, the cleaning of the fluid from solids, light liquids and dissolved substances leads to a particularly good cleaning performance being achieved with the process. This means that the storage / infiltration system remains very well protected against colmation and is therefore functional for a very long time.

In a preferred development of the invention it is provided that the method additionally comprises the step of downstream cleaning of the fluid from foreign substances in a post-cleaning stage. It is preferably a downstream cleaning in a biofiltration stage. The downstream cleaning takes place after the fluid has been temporarily stored in the storage / infiltration stage and before the fluid has been released into the ground or into the sewer network. This enables particularly good cleaning performance.

In a preferred development of the invention it is provided that the method comprises the step of drying the cleaning stage and / or essentially completely releasing the fluid to the storage / infiltration stage. This step creates aerobic conditions in the cleaning stage. So there is a supply of oxygen to the foreign substances that are retained by the cleaning stage. The aerobic conditions improve the biological degradation or conversion of the foreign substances in the cleaning stage. In addition, the falling dry causes a negative pressure in the cleaning stage as a result of the falling fluid level, which supplies the retained solids with atmospheric oxygen in order to further support the aerobic biodegradation. By falling dry, the process ensures particularly good biological degradation of the foreign matter, which reduces maintenance costs.

In this context, a further preferred development of the invention provides that the method includes the step of taking up the fluid for intermediate storage in the cleaning stage. This leads to the fact that, despite the integration of the cleaning stage in the storage / infiltration stage, essentially the same storage volume is available as in a storage / infiltration system with comparable dimensions and without a cleaning stage or a non-integrated cleaning stage. Essentially the same storage volume is guaranteed by the fact that the cleaning stage falls dry and fills up again with the fluid when it rains again. The volume of the cleaning stage is therefore also available as a retention volume for intermediate storage without the cleaning ability of the cleaning stage being lost as a result.

In a preferred development of the invention it is provided that the cleaning of the fluid from foreign substances in the cleaning stage includes a retention of foreign substances in the cleaning stage. In particular, retention is understood to mean a sustained retention of the foreign matter. With a renewed entry of fluid, there is no remobilization of the previously sedimented solids or a renewed dissolution of the adsorbed substances in the cleaning stage.

Further advantages, features or applications result from the following Description of the figures, with all of the features shown and mentioned being considered essential to the invention either individually or in any combination.

• 1 schematisch ein Speicher-/Versickerungssystem aus dem Stand der Technik,
• 2a schematisch ein Speicher-/Versickerungssystem gemäß einem bevorzugten Ausführungsbeispiel der Erfindung,
• 2b schematisch eine vergrößerte Darstellung eines Abschnittes des Speicher-/Versickerungssystems aus 2a, gemäß einem bevorzugten Ausführungsbeispiel der Erfindung,
• 3 schematisch das Speicher-/Versickerungssystem aus 2 während eines Regenereignisses, gemäß einem bevorzugten Ausführungsbeispiel der Erfindung,
• 4 schematisch das Speicher-/Versickerungssystem aus 2 und 3 nach einem Regenereignis, gemäß einem bevorzugten Ausführungsbeispiel der Erfindung, und
• 5 ein Flussdiagramm mit den Schritten eines Verfahrens zur Zwischenspeicherung eines Fluids in einem Speicher-/Versickerungssystem, gemäß einem bevorzugten Ausführungsbeispiel der Erfindung.

Show in the drawings

• 1 schematically a storage / infiltration system from the state of the art,
• 2a schematically a storage / infiltration system according to a preferred embodiment of the invention,
• 2 B schematically shows an enlarged representation of a section of the storage / infiltration system 2a , according to a preferred embodiment of the invention,
• 3 schematically the storage / infiltration system 2 during a rain event, according to a preferred embodiment of the invention,
• 4th schematically the storage / infiltration system 2 and 3 after a rain event, according to a preferred embodiment of the invention, and
• 5 a flowchart with the steps of a method for the intermediate storage of a fluid in a storage / infiltration system, according to a preferred embodiment of the invention.

1 shows schematically a storage / infiltration system 1 According to the state of the art. It is the storage / infiltration system 1 a multi-stage system with one cleaning stage 2 a storage / infiltration stage 3 is upstream. The polluted rainwater is cleaned in separate stages, which are not in the storage / infiltration stage 3 are integrated. As a result, the space requirements and maintenance costs of such a system are very high.

The 2 , 3 and 4th show schematically a storage / infiltration system 10 according to a preferred embodiment of the invention, wherein 2 B an enlarged view of a section 2a shows. The storage / infiltration system 10 includes a storage / infiltration stage 12 that is designed to be rainwater 14th for intermediate storage and for infiltration into a storage / infiltration system 10 surrounding soil 16 submit. It also includes the storage / infiltration system 10 a cleaning stage 18th that the rainwater 14th of foreign matter 20th cleans, the cleaning stage 18th in the storage / infiltration stage 12 is integrated. The storage / infiltration system 10 has an inlet 22nd on which the rainwater 14th the cleaning level 18th feeds. In this embodiment, the volume in the ground 16 from the storage / infiltration system 10 is taken, kept free by several hollow bodies (not shown). The storage / infiltration system 10 is on its underside with a water-permeable fleece 24 equipped, through which the temporarily stored rainwater 14th in a defined amount and speed into the ground 16 can seep away. In principle, however, it is also possible that the rainwater 14th not only on the underside but also on the sides of the storage / infiltration system 10 in the ground 16 can seep away.

About the rainwater 14th from the foreign matter 20th cleaning includes the cleaning stage 18th three sections 26th , 28 , 30th , each with its own maintenance option 32 feature. The first paragraph 26th is a sedimentation section 26th , the coarser solids 20th holding back. The solids 20th settled in the sedimentation section 26th as sediment on the bottom of the first section 26th from. To stabilize the sediments, sludge traps or sedimentation spaces can be provided on the bottom of the sedimentation section 25th be present by diving walls 23 are formed. The sludge traps or sedimentation rooms 25th ensure that the settled sediment can stabilize against hydraulic influences and is not remobilized in the event of greater hydraulic loads. Furthermore, it is possible to introduce further elements into the sedimentation section to support the sedimentation process, for example in the form of a lamella clarifier. This enables high material separation efficiency with little space requirement. In addition, the use of elements to separate the flow creates a grid structure here 27 with vertical 27a and horizontal 27b elements floating substances and light liquids are stabilized and are preferably firmly bound to cleaning elements. The vertical 27a and horizontal 27b elements of the lattice structure 27 can be introduced independently of one another. Furthermore, there is an oil separation area in the embodiment shown here 29 in the upper area of the sedimentation section 26th .

The second section 28 is a sorption section 28 that can be flown through hydraulically either horizontally or vertically and the light liquids 20th as well as very fine particulate solids 20th and solutes 20th holding back. The sorption section 28 is made up of several layers of different filter layers. In the exemplary embodiment preferred here, the sorption section comprises 28 a layer of coalescing fabric 34 , a layer of sorbent fabric 36 and an ion exchange surface 38 .

The third section 30th is a membrane filter section 30th , the other foreign matter 20th by means of a membrane 40 from the rainwater 14th away. The rainwater can thereby 14th the membrane 40 happen while the foreign matter 20th due to the porosity of the membrane 40 in the membrane filter section 30th due to the filter effect.

Like in particular the 3 and 4th can be seen, the cleaning level 18th fall dry. This means the purification stage 18th the rainwater 14th after a rain event essentially completely to the storage / infiltration stage 12 gives ( 4th ). Next, this also means that the cleaning stage 18th the rainwater during a rain event 14th can be included for intermediate storage ( 3 ). Thus, despite the integration of the cleaning stage 18th in the storage / infiltration stage 12 the storage volume is essentially the same as in a storage / infiltration system with comparable dimensions and without a cleaning stage. The volume of the cleaning stage 18th is also available as a retention volume for the intermediate storage of rainwater 14th to disposal.

So that when filling the cleaning stage 18th and when the cleaning stage falls dry 18th none are already in the cleaning stage 18th foreign matter 20th mobilize and into the storage / infiltration stage 12 entered is the cleaning level 18th designed such that the foreign matter 20th from the cleaning level 18th be held back. For this are in the run 22nd and in the cleaning stage 18th flow-restricting structures provided (not shown). The flow-inhibiting structures reduce the flow of rainwater 14th .

5 shows a flowchart with the steps of a method for the intermediate storage of rainwater 14th in the storage / infiltration system 10 , according to a preferred embodiment of the invention. In this embodiment, the method comprises five steps, but fewer or more steps are also possible.

When it rains, the rainwater arrives 14th in the purification stage, where the rainwater 14th in a first step of foreign matter 20th is cleaned. In this step the rainwater is used 14th cleaned of solids, light liquids and dissolved substances, the foreign substances 20th in the cleaning stage 18th be held back.

The rainwater 14th It then enters the storage / infiltration stage 12 where the rainwater 14th is cached in a further step.

In the case of persistent rain events, the precipitation water is also absorbed in a further step 14th for intermediate storage in the cleaning stage 18th instead of. The volume of the cleaning stage 18th is also available as a retention volume for the intermediate storage of rainwater 14th to disposal.

The rainwater 14th is in a further step from the storage / infiltration stage 12 to the storage / infiltration system 10 surrounding soil 16 released or released into a sewer network.

When the rain event ends, the cleaning stage dries out in a further step 18th , where the cleaning level 18th the rainwater 14th essentially completely to the storage / infiltration stage 12 gives. In particular, the cleaning stage falls dry while maintaining the cleaning function of the cleaning stage.

List of reference symbols

1

Storage / infiltration system (state of the art)

2

Cleaning level (state of the art)

3

Storage / infiltration stage (state of the art)

10

Storage / infiltration system

12th

Storage / infiltration stage

14th

Fluid, rainwater

16

soil

18th

Cleaning level

20th

Foreign matter, solids, light liquids, dissolved substances

22nd

Intake

23

Diving wall

24

water-permeable fleece

25th

Sludge trap, sedimentation room

26th

Section 1, sedimentation section

27

Lattice structure

27a

vertical element of the lattice structure

27b

horizontal element of the lattice structure

28

Section 2, sorption section

29

Oil separation area

30th

Section 3, membrane filter section

32

Maintenance possibility, maintenance opening

34

Coalescing fabric

36

Sorpion tissue

38

Ion exchange surface

40

membrane

Claims (15)

Storage / infiltration system (10) for a fluid (14), comprising a storage / infiltration stage (12) and a cleaning stage (18), the storage / infiltration stage (12) being designed to store the fluid (14) temporarily to be absorbed into itself and discharged for infiltration into a soil (16) surrounding the storage / infiltration system (10), into a sewer network or into a drainage system, the cleaning stage (18) being designed to remove the fluid (14) from foreign substances (20 ) to clean before the fluid (14) is taken up by the storage / infiltration stage (12), characterized in that the cleaning stage (18) is integrated into the storage / infiltration stage (12) or that the storage / infiltration stage (12 ) is integrated into the cleaning stage (18). Storage / infiltration system (10) according to Claim 1 characterized by an inlet (22) which supplies the fluid (14) to the cleaning stage (18). Storage / infiltration system (10) according to one of the preceding claims, characterized by one or more hollow bodies which keep a volume free in the ground (16). Storage / infiltration system (10) according to one of the preceding claims, characterized in that the cleaning stage (18) is designed to clean the fluid (14) from solids, light liquids and / or dissolved substances. Storage / infiltration system (10) according to one of the preceding claims, characterized in that the cleaning stage (18) comprises several sections (26, 28, 30), the sections (26, 28, 30) each having a maintenance facility (32) . Storage / infiltration system (10) according to one of the preceding claims, characterized in that the cleaning stage (18) comprises a sedimentation section (26), a sorption section (28) and / or a membrane filter section (30). Storage / infiltration system (10) according to one of the preceding claims, characterized in that the cleaning stage (18) is designed to fall dry and / or that the cleaning stage (18) is designed to essentially completely apply the fluid (14) to deliver the storage / infiltration stage (12). Storage / infiltration system (10) according to one of the preceding claims, characterized in that the cleaning stage (18) is designed to receive the fluid (14) for intermediate storage. Storage / infiltration system (10) according to one of the preceding claims, characterized in that the cleaning stage (18) is designed in such a way that the foreign substances (20) are retained by the cleaning stage (18). Storage / infiltration system (10) according to one of the preceding claims, characterized in that flow-inhibiting structures are provided in the inlet (22) and / or in the cleaning stage (18). Method for the intermediate storage of a fluid (14) in a storage / infiltration system (10), the storage / infiltration system (10) comprising a storage / infiltration stage (12) and a cleaning stage (18), and the cleaning stage (18) in the storage / infiltration stage (12) is integrated or the storage / infiltration stage (12) is integrated in the cleaning stage (18), comprising the steps: - cleaning the fluid (14) from foreign substances (20) in the cleaning stage (18), - Intermediate storage of the fluid (14) in the storage / infiltration stage (12) and - Dispensing of the fluid (14) to a soil (16) surrounding the storage / infiltration system (10) or into a sewer network. Procedure according to Claim 11 characterized in that the cleaning of the fluid (14) of foreign substances (20) in the cleaning stage (18) comprises cleaning of the fluid (14) of solids, light liquids and / or dissolved substances. Method according to one of the Claims 11 or 12 characterized in that the method comprises the step of drying the cleaning stage (18) and / or essentially completely releasing the fluid (14) to the storage / infiltration stage (12). Method according to one of the Claims 11 to 13 characterized in that the method comprises the step of taking up the fluid (14) for intermediate storage in the cleaning stage (18). Method according to one of the Claims 10 to 13 characterized in that the cleaning of the fluid (14) from foreign substances (20) in the cleaning stage (18) comprises a retention of foreign substances (20) in the cleaning stage (18).

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