DE102020122940A1 - rainwater purification system and rainwater purification system - Google Patents

Abstract

The invention relates to a rainwater treatment plant (1) comprising a first cleaning device (30) for rainwater or mixed water, a rainwater tank (20) for rainwater or mixed water with an overflow (22) in the tank outlet (clarifier overflow) and/or in the tank inlet (tank overflow) and a system controller (40) for controlling the operational interaction of the first cleaning device (30) and the rainwater tank (20).

Description

The invention relates to a rainwater treatment system comprising a rainwater tank and at least one first cleaning device.

Furthermore, the invention relates to a rainwater treatment device, comprising a rainwater tank and at least one first cleaning device.

In rainy weather, sewage treatment plants only treat a small amount of rainwater, which is in the order of 0.1 l/s/ha. However, due to their intensity, most rains lead to runoff of 1 to 10 l/s/ha. Only a third of the rain or the annual amount of rain leads to runoff over 10 l/s/ha. The limit of the performance of a rainwater or mixed water sewer system is reached at the latest at a magnitude of 100 l/s/ha. Excessive rain can lead to flooding.

Every slightly heavier rain leads to the filling of the sewers. In the past, sewage systems had special rainwater overflows that could divert rainwater from the sewer into neighboring bodies of water at suitable points in order to avoid overloading the sewage system. This then led to pollution and fish kills in the waters, especially after summer thunderstorms. In general, moderately cleaned or uncleaned discharges and discharges have introduced and continue to add significant amounts of solids/fines to water bodies.

Around the 1980s, the treatment of stormwater from combined sewer systems began. Up to the so-called critical rain of 7.5 and later 15 l/s/ha, i.e. up to a greater dilution of the dirty water, the overflowing rainwater then had to be routed through the so-called rain overflow basin (RÜB) and sedimented there. The correspondingly cleaned rainwater is referred to as sewage overflow (KÜ). Only rarer, heavier rains may continue to be discharged into the water bodies without treatment. This overflowing rainwater is referred to as rain or pool overflows (RÜ / BÜ).

When it became clear that rainwater from separate sewerage systems is similarly polluted as dirty water diluted by rain, a counterpart to the stormwater overflow basins (RÜB) in combined sewerage systems was created with rainwater settling tanks (RKB) in separate sewerage systems.

Both RKB and RÜB work well as long as they catch the rain without rain overflow occurring. However, the sedimentation capacity of the basins in the sewage overflow is rather low, so that overall they mainly act by retaining rain. Only about 20% of the filterable fines (AFS) are sedimented from the basin flow. Therefore, there are approaches to optimize the RKB, e.g. by installing inclined separators and cleaning the clarifier overflows better.

After the rain, the basins empty towards the sewage treatment plant. The actual cleaning of the rainwater thus takes place in the sewage treatment plant, which experiences an unfavorable increase in the load as a result.

There are also approaches to separate storage and cleaning from one another and to shift cleaning to a separate lamella separator, which is fed from the storage via a pump. The separator, which is dimensioned for emptying at about 1 l/s/ha and thus for a relatively small throughput, then takes over the more or less complete cleaning of the rainwater. As a result, however, it silts up heavily, which is why special cleaning processes for the separator (pivoting techniques) are proposed and use in the mixing system does not make sense. In connection with the separation of storage and separation, there is constant operation of the lamellar separator during the rain and the basin emptying when it rains.

In some sewer networks, an attempt is made to store rainwater by damming up the maximum volume available in the sewers by controlling the sewer network so that less rainwater overflows. Recently, the controls are also intended to reduce the actual dirt loads more specifically than the simple amounts of water in the overflows. For this purpose, quality-dependent control systems for the sewer networks with various stormwater overflows and basins are being tested. All of these systems are faced with a certain complexity of the network control and a considerable variability and forecasting uncertainty with regard to the input parameters, which makes it difficult to find an optimal control variant for the network.

At the same time, there are approaches to avoid deposits in sewers and dry periods caused by damming up when there is weak rain and flushing surges generated afterwards, so that combined sewer systems have fewer deposits during critical and supercritical rain events, remobilize them and relieve them by overflowing into the water bodies.

At present there are also attempts to replace the clarifiers with large filter systems. In addition, there have been smaller centralized and smaller decentralized systems with high performance for a long time (filters, lamella separators, pipe sedimentation systems/sedipipes). The systems achieve efficiencies of over 80% AFS, but are very complex for large systems and are therefore used on smaller scales.

For around 20 years now, instead of rainwater tanks (RÜB/RKB), very efficient retention soil filters (RBF) have been used, which also achieve cleaning levels of over 80%, are also suitable for large systems and do not require or have a drain to the sewage treatment plant. The good efficiency of the RBF is achieved, among other things, by the relatively large retention volume in combination with the downstream filtration. The disadvantage of the RBF is the relatively large area required, problems with long dry periods and the maintenance effort in general.

Analogously working, technical filters with upstream retention basins are conceivable, but are not built. The disadvantage here is again the large requirement for upstream retention volume and the upstream pre-cleaning that is customary here.

Either way, the RÜB / RKB are getting on in years, so that the efforts towards an improvement of the rain treatment are intensifying. Also, there is still a great need for rainwater treatment for rainwater from roads outside of towns.

The use of the RBF is currently considered to be the obvious solution, with a small settling tank (with light liquid separation) often being installed upstream.

Due to increasing periods of drought and the general maintenance effort, however, efficient, drought-resistant, low-maintenance technical alternatives to the RBF and to improve rainwater treatment as a whole should be sought. For reasons of economy and feasibility, it is generally necessary to keep the necessary retention volumes as small as possible and to make the rainwater treatment as variable as possible so that it can be adapted to the respective rain and load situation. At the same time, the concepts should allow a practicable retrofitting of existing systems.

Proceeding from this, the invention is based on the object of creating a solution that allows improved rainwater treatment and can be retrofitted to existing rainwater treatment systems.

This object is achieved by the rainwater treatment system according to claim 1. Furthermore, this object is achieved by the rain clearing device according to claim 11. Advantageous refinements and developments are the subject of the respective dependent claims.

According to the invention, a rainwater treatment system is provided comprising a first cleaning device for rainwater or mixed water, a rainwater tank for rainwater or mixed water with an overflow in the tank outlet (clarifier overflow) and/or in the tank inlet (tank overflow) and a system control for controlling the operational interaction of the first cleaning device and the rain basin.

Furthermore, according to the invention, a rainwater treatment device is provided, comprising a rainwater tank and at least one first cleaning device, the at least one first cleaning device being integrated into the rainwater tank.

In a development of the rainwater treatment system, the rainwater tank can be a rainwater treatment tank or a rainwater overflow tank or a rainwater retention tank and can preferably be designed as a catchment, flow-through or composite tank. The rainwater tank of the rainwater treatment plant can also be designed as a rainwater retention channel or as a rainwater backwater channel or as a storage channel with overflow or a combination of the two types of system. The first cleaning device can be designed as a pipe sedimentation, lamellar separator, filter or a combination thereof.

Furthermore, in an embodiment of the rainwater treatment plant, it can be provided that the system controller is designed to control or regulate the rainwater throughput through the rainwater tank and the first cleaning device.

The system control can be designed for (direct) influencing the flow through the first cleaning device and (indirect) influencing the pool inflow and/or overflow.

In an embodiment, the rainwater treatment system can provide that the system control has at least one throughflow control or throughflow regulating device.

This can be formed from at least one adjustable control element as a slider/valve or throttle or pump. The inflow to the first cleaning device is preferably designed to be significantly smaller than the inflow to the rainwater tank.

Furthermore, the rainwater treatment plant or its rainwater overflow in the mixed system can have a throttled waste water outlet to a treatment plant and/or generally an emptying or rinsing water or sludge discharge to a treatment plant.

Furthermore, a light matter flotation or baffle can be formed in the stormwater basin and/or fine screening system can be formed on one or both overflows (clarifier/basin overflow).

The rainwater purification system can also have a second cleaning device, such as a filter and/or adsorber, which is preferably connected downstream of the system control so that the inflow to the cleaning device can be regulated or controlled.

The rainwater treatment plant can also have a flushing water, sludge or sludge treatment device and/or a flushing water, sludge or sludge storage device, which is designed separately from the first cleaning device and the second cleaning device. As a result, the rainwater treatment plant is independent of a derivation or emptying to a sewage treatment plant.

• Insbesondere bei größeren Regenkläranlagen kann sich die Einrichtung spezieller Spülwasser- und Schlammaufbereitungen lohnen, damit die Kläranlage auch nach dem Regen nicht durch Schlammwasser belastet wird. In Trennkanalisationen, insbesondere bei der Regenwasserbehandlungsanlagen für Straßen außerorts, besteht oft auch gar keine Möglichkeit zur Entleerung des Spülschlamms in Richtung einer Kläranlage.

Due to the level of rainwater treatment in the RKA, it is no longer necessary to empty the rainwater tank contents of the RKA in the direction of the sewage treatment plant. In principle, when using RKA, the inflows to the sewage treatment plant in rainy weather can be much closer to the dry weather level, which favors the cleaning performance of the sewage treatment plants in rainy weather. Only the flushing sludge from the RKA should possibly be routed to the sewage treatment plant. But again, this is not essential:

• In the case of larger rainwater treatment plants in particular, it can be worthwhile setting up special rinsing water and sludge treatment so that the treatment plant is not polluted by sludge water even after it has rained. In separate sewage systems, especially in rainwater treatment systems for out-of-town roads, there is often no possibility of emptying the flushing sludge in the direction of a sewage treatment plant.

• Zur Schlamm- bzw. Spülwasserspeicherung und -aufbereitung können (z.B. vertikal durchströmte) Sedimentertanks vorgesehen werden, deren Überstände wieder durch die Regenkläranlage geführt werden. Bei horizontal beschickten Sedimentern können Krählwerke die Eindickung verbessern.

The processing of the flushing sludge of the individual stages is usually provided in a separate part of the plant outside the rainwater cleaning facilities:

• Sedimentation tanks (e.g. with a vertical flow) can be provided for storing and processing sludge or flushing water, and the residues are fed back through the rainwater treatment plant. In the case of horizontally fed sedimenters, rabble rakes can improve thickening.

Alternatively, drilling sludge can also be fed into drained infiltration basins, in which the sludge dries and is “ground”.

An additional, but optional lime admixture in the sedimenter inlet or the flushing sludge conveyance to the infiltration basin can promote the retention of heavy metals and fine particles and stabilize the sludge.

Thickened sedimentary sludge must be pumped out of the sedimenter regularly with tankers and, for example, fed to further sludge dewatering in a sewage treatment plant. Dried, grounded sludge can be removed from the drained infiltration basin at greater intervals and sent directly to incineration.

Furthermore, in the design of the rainwater treatment system it can be provided that the first cleaning device and the rainwater tank are connected directly to the rainwater overflow, i.e. are arranged in parallel. A bypass line can connect the rainwater tank to the first cleaning device, wherein the first cleaning device can be charged with rainwater from the rainwater tank depending on the fill level of the rainwater tank. This happens during the filling of the rainwater tank and in particular when it is emptied if the rainwater tank is lower than the cleaning device.

A parallel connection within the meaning of the invention means that a connection is formed between the inlet of the rainwater tank and the inlet of the first cleaning device.

Furthermore, the rainwater treatment system can provide for the rainwater tank and the first cleaning device to be connected in series with the rainwater overflow.

A series connection within the meaning of the invention means that a connection is formed from the outflow zone of the stormwater tank or an overflow area of the stormwater tank upstream of the clarifier overflow to the inlet of the cleaning device or from the clarifier overflow of the stormwater tank to the inlet of the cleaning device.

Furthermore, a mixed series circuit can be formed, so that a connection between the outlet zone of the stormwater tank and the inlet of the cleaning device and between the sewage overflow of the rainwater tank and the inlet of the cleaning device.

Furthermore, the rainwater treatment plant can have a mixing circuit. A mixed circuit within the meaning of the invention means that there is at least one cleaning device in the above-mentioned parallel connection and at least one further cleaning device in the above-mentioned series connection.

In a further development of the rainwater purification system, it can be provided that the system control is combined centrally and is preferably connected directly downstream of the first cleaning device for outflow control from the first cleaning device.

Furthermore, if a second cleaning device is configured, the system control is arranged in front of the second cleaning device so that it can also be controlled or regulated via the system control.

Furthermore, in a further development of the rainwater treatment system, it can be provided that the first cleaning device is connected to the rainwater tank in such a way that, depending on the situation, in particular depending on the season and/or the degree of pollution of the catchment area or the quantity or pollution of the water discharge, the first cleaning device is treated with rain - or mixed water from the inflow or outflow of the rainwater tank can be applied.

The system control can be designed, depending on the amount and dirt load of the rain inflow measured at the rainwater treatment plant (in m ³ or kg) and/or the course of inflow and degree of pollution measured at the rainwater treatment plant (in l/s or g/l ) to control or regulate.

Furthermore, the system controller can be designed to control or regulate depending on the amount of rain and/or dirt (in m ³ or kg) expected for the rainwater treatment system according to rain forecasts or according to the rain radar.

The system controller can also be designed to control or regulate depending on the course of rain and/or dirt inflow (in l/s or g/l) expected for the rainwater treatment system according to rain forecasts or according to the rain radar.

The system controller can also be designed to control or regulate as a function of the outflows and/or degrees of contamination measured in the rainwater treatment system outflows.

In a development of the rainwater treatment plant, it can also be provided that the first cleaning device is structurally integrated into the rainwater tank.

In a development of the rain clearing device, it can be provided that the at least one first cleaning device is at least one pipe sedimentation system.

Furthermore, the rain clearing device can provide that the at least one first cleaning device is elevated.

The rainwater treatment device can also provide that the at least one first cleaning device is arranged in such a way that it can be charged with water from the rainwater basin.

Furthermore, the rain clearing device can be designed in such a way that the rain clearing device has an outlet which is connected to the at least one first cleaning device and has a pump and/or a pressure line which is/are designed to draw off the water from the first cleaning device.

In an embodiment of the rain clearing device it can be provided that the first cleaning device is only partially integrated into the rain basin.

• Bei Regenbecken mit Klärüberlauf zielt die Ablaufsteuerung und Dimensionierung der parallelgeschalteten Reinigungseinrichtung auf eine möglichst weitgehende Vermeidung des Anspringens des Beckenüberlaufs/Regenüberlaufs ab. Dabei kann eine Vergrößerung des Klärüberlaufs auch über das aktuell vorgesehene Niveau von z.B. rund 15 1/s/ha hinaus sinnvoll sein. Eine wesentliche Aufgabe der Ablaufsteuerung bildet also eine Vermeidung bzw. Verhinderung eines Becken-/Regenüberlaufs. Daneben verfolgt die Steuerung noch diverse weitere Aufgaben:
  • • die Minimierung der (Klär-)Überlaufmenge
  • • die Minimierung des Schmutzaustrags im (Klär-)Überlauf
  • • die Minimierung des Schmutzaustrags der RKA insgesamt
  • • die Minimierung der Verschlammung der Reinigungseinrichtungen
  • • die Optimierung der Behandlung in der/den Reinigungseinrichtungen
  • • die Optimierung der Entleerung des Regenbeckens vor evtl. Folgeregen
  • • die Optimierung einer automatischen Beckenreinigung und der Spülschlammbehandlung

The configuration according to the invention results in the following advantageous effects:

• In the case of rainwater tanks with a sewage overflow, the process control and dimensioning of the cleaning device connected in parallel aims to avoid the tank overflow/rainwater overflow from starting as far as possible. In this context, an increase in the sewage overflow above the currently planned level of around 15 l/s/ha, for example, can also make sense. An essential task of the sequence control is therefore the avoidance or prevention of a pool/rain overflow. In addition, the controller also performs various other tasks:
  • • the minimization of the (sewage) overflow quantity
  • • the minimization of dirt discharge in the (clarification) overflow
  • • the minimization of the dirt discharge from the RKA as a whole
  • • minimizing silting up of cleaning facilities
  • • the optimization of the treatment in the purification facility(ies).
  • • the optimization of the emptying of the rainwater basin before possible subsequent rain
  • • the optimization of an automatic pool cleaning and mud treatment

Since the flow control controls several streams and thus the entire operation of the RKA, it is more appropriately referred to as "plant control" (AS).

By minimizing the sewage overflow and avoiding/preventing the overflow of the basin, a reduction in hydraulic water pollution is ensured in addition to the improvement in rainwater treatment. Particularly in combination with a sewer network control or even storage sewerage, significant reductions in hydraulic water pollution can be achieved when using the RKA. This can mean that an RKA makes a large-volume rainwater retention basin, which would otherwise be required, unnecessary. The separate sewage system will probably also become unnecessary, since the hydraulic and material efficiency of the rainwater treatment in the RKA is similar to that of a sewage treatment plant. As a result, the usual emptying of the basin to the sewage treatment plant can be omitted and the sewage treatment plant can be relieved by the RKA, which in turn also improves its cleaning performance in rainy weather.

• • Regenvorhersagen/Regenradar (Regenhöhe, Regenverlauf, Übertragung der Regen- bzw. Steuerdaten z.B. per SIM-Karte von einer Zentrale an die SPS)
• • Abstände zu erwarteten Nachregen, d.h. verfügbarer Entleerungszeitraum (Vorhersage/Regenradar)
• • Abstände zu Vorregen, resultierende / saisonale Oberflächenverschmutzung im Einzugsgebiet (Prognosen)
• • Schmutzkonzentration in Durchflüssen in der Anlage über Trübung (optisch), Leitfähigkeit, pH-Wert etc. (an der Anlagensteuerung sowie optional im Gesamtzulauf)
• • Regendurchfluss im Gesamtzulauf (z.B. per Zuflusshöhenmessung) und an der Anlagensteuerung (z.B. per MID) sowie Füllstand im Regenbecken

The system control AS should generally control the flows via slides/valves and/or pumps. These control elements are operated, for example, via a local PLC or similar, which dynamically divides the flow. The following sensors or measured variables are conceivable as control parameters:

• • Rain forecasts/rain radar (height of rain, course of rain, transmission of rain or control data, e.g. via SIM card from a control center to the PLC)
• • Distances to expected after-rain, ie available emptying period (forecast/rain radar)
• • Distances to pre-rain, resulting / seasonal surface pollution in the catchment area (forecasts)
• • Contamination concentration in the flow in the system via turbidity (optical), conductivity, pH value etc. (on the system control and optionally in the total inflow)
• • Rain flow in the total inflow (e.g. by measuring the inflow height) and at the system control (e.g. by MID) as well as the fill level in the rain basin

• Regenbecken zur Reinigung von rund 15 I/s/ha werden mit einem spezifischen Volumen von z.B. 25 m³/ha ausgelegt und laufen z.B. etwa 25 Mal jährlich über, wobei Regen erst ab etwa einer Stunde Dauer aufgrund ihrer Volumina relevant für Überläufe der Regenbecken werden. Dabei werden dann neben den 25 m³/ha im Regenbecken z.B. noch 25 m³/ha im Kanal und ca. 40 m³/ha auf den Oberflächen des Einzugsgebietes zurückgehalten, in der Summe also rund 90 m³/ha. Ein 1stündiger Regen, der 2 Mal im Jahr auftritt, hat eine Regenhöhe/Ergiebigkeit von z.B. 12 mm entsprechend 120 m³/ha.

The operating and control concept of a rainwater treatment plant works, for example, as follows:

• Rainwater tanks for cleaning around 15 l/s/ha are designed with a specific volume of, for example, 25 m ³ /ha and overflow, for example, about 25 times a year, with rain only becoming relevant for overflows in the rainwater tanks from a duration of around one hour due to its volume . In addition to the 25 m ³ /ha in the stormwater basin, for example, another 25 m ³ /ha in the sewer and approx. 40 m ³ /ha on the surface of the catchment area are retained, ie around 90 m ³ /ha in total. A 1-hour rain that occurs twice a year has a rain depth/coverage of 12 mm, for example, corresponding to 120 m ³ /ha.

This means that in this case, for example, 30 m ³ /ha of the 120 m ³ /ha flow off via the sewage overflow of a conventional rainwater tank and are only moderately settled and cleaned. In the case of prolonged heavy rain, this amount and its share in the rain can increase significantly.

In order to also clean the amount of rain of 30 m ³ /ha, a preferably parallel cleaning device for 30 m ³ /ha/h or iM 8 l/s/ha is required in the aforementioned case. This corresponds to only about half the design value of the rainwater tank. This value would be even lower if it rained for longer periods of time, because the rain depths increase only slightly when it rains for more than an hour.

If one assumes that the cleaning device connected in parallel is designed for a separation of 80% AFS at a throughput of 4 l/s/ha, then the separation rate would be reduced to eg 50% AFS at a throughput of 8 l/s/ha . However, this rate is significantly higher than the 20% AFS separation that the rainwater tank would achieve in the overflow case considered. (A throughput of 4 l/s/ha is well below the 15 l/s/ha, so that there is not a great disadvantage for the rainwater tank from a series connection, since this is only possible with a series connection, for example with 19 instead of 15 l/ s/ha is applied.)

All in all, the control is about selecting the flow through the cleaning device in such a way that the best overall separation performance is achieved over the expected rain. The previously considered case of one-hour rain already corresponds to a very unfavorable case. If it rains for a shorter or longer period of time, the cleaning device would be subjected to less load or extensively clean significantly more rain volume over the duration of the rain. The system control thus allows adaptation to the respective local conditions as well as to the rain and its course.

• In Phasen eher schwach verschmutzten Zulaufs wird der Durchsatz durch die erste Reinigungseinrichtung gesteigert, um in Phasen stärker verschmutzten Regens mehr Rückhaltevolumen verfügbar zu haben und um den Durchsatz durch die erste Reinigungseinrichtung dann zugunsten einer besseren Abscheidung senken zu können. Eine auf z.B. 4 I/s/ha bemessene erste Reinigungseinrichtung wird deshalb insgesamt ausreichen, um sowohl vom Abscheidegrad als auch von der Regenmenge eine erhebliche Verbesserung der Regenwasserbehandlung zu erzielen.

The degrees of separation of the rainwater tanks and the first cleaning devices and their dependence on the throughput are generally known. However, by measuring the turbidity in the outlet of the first cleaning device, the throughput can be controlled in a more controlled and event-specific manner. In particular, load situations that change over the duration of the rain can be used as follows:

• The throughput through the first cleaning device is increased in phases of rather weakly soiled inflow in order to have more retention volume available in phases of more heavily soiled rain and to then be able to reduce the throughput through the first cleaning device in favor of better separation. A first cleaning device rated at, for example, 4 l/s/ha will therefore be sufficient overall to achieve a significant improvement in rainwater treatment, both in terms of the degree of separation and the amount of rain.

• Durch die optimierte Vorsedimentation im Regenbecken und die optimierte Abscheidung in der ersten Reinigungseinrichtung wird eine nachgeschaltete zweite Reinigungsseinrichtung (F/Ad) sowohl hydraulisch als auch stofflich nur noch schwach beaufschlagt. Dies kommt der Praktikabilität des Baus und Betriebs einer solchen Stufe sehr entgegen, da so weniger Schlamm in den hierfür betrieblich sensibleren Feinstufen anfällt. Die Regenwasserbehandlung würde darüber hinaus sehr weitgehend sein und das Niveau eines Retentionsbodenfilters oder gar einer Kläranlage erreichen. Insgesamt würden sich mit der nachgeschalteten Feinstufe mindestens 90 % der Jahresniederschläge behandeln lassen, wobei diese aber aufgrund der Vorbehandlung aber nur noch mit maximal 10 % der Schmutzfracht belastet sind. Eine entsprechende Regenwasserbehandlung kann Wirkungsgrade von über 95 % bezogen auf die Feinstoffe erreichen und dennoch betriebssicher arbeiten und sich wirtschaftlich errichten und betreiben lassen.

The second cleaning device (e.g. filtration) is designed to treat "only" normal rain as far as possible. It is therefore measured at 1 l/s/ha, for example. When it rains more than 1 l/s/ha, the rainwater settling tank serves as a retention or buffer volume, with good pre-sedimentation already taking place there. The system control then throttles the throughput through the first and the downstream second cleaning device to 1 l/s/ha. The first cleaning device then also achieves maximum efficiency. If there is sufficient emptying time before the subsequent rain, RKA can completely catch a lot of rain and then treat it slowly and thus to a large extent in the RKA. The system control ensures that the separation locations are always optimal:

• Due to the optimized pre-sedimentation in the stormwater tank and the optimized separation in the first cleaning device, a downstream second cleaning device (F/Ad) is only slightly loaded, both hydraulically and materially. This is very much in line with the practicability of constructing and operating such a stage, since less sludge is produced in the fine stages, which are more sensitive operationally for this purpose. The rainwater treatment would also be very extensive and reach the level of a retention soil filter or even a sewage treatment plant. Overall, at least 90% of the annual precipitation could be treated with the downstream fine stage, although this is only polluted with a maximum of 10% of the dirt load due to the pre-treatment. A corresponding rainwater treatment can achieve efficiencies of over 95% based on the fines and still work reliably and can be built and operated economically.

The combination of graduated, first and second cleaning devices and the system control described above can thus achieve a very comprehensive rainwater treatment, which is why this is referred to as a rainwater treatment system.

For the sake of simplicity, the system control of the rainwater treatment plant and its metrological focus should be between the first and the second cleaning device. Basically, however, decentralized positions of the sensors and control elements distributed over the system are also conceivable. In particular in connection with hydraulic losses in filtration, controlled pumps can be useful or necessary instead of control valves, which compensate for these losses.

• Rohrsedimentationsanlagen (RSA) sind i.d.R. aus Kunststoff und für den Erdeinbau konstruiert, können aber bei Ausführung in Stahl bzw. Edelstahl auch in Regenbecken eingebaut/nachgerüstet werden. Die RSA werden dazu ohne den üblichen Startschacht in gewissen Abständen über den Beckenboden verteilt aufgeständert, so dass der Zufluss direkt aus dem Becken in die RSA erfolgt und die RSA sich bei Beckenentleerung zusammen mit dem Becken entleeren.

In the foregoing, it was initially assumed that the cleaning equipment of the rainwater treatment plant would be built next to the rainwater or storage tank or as a small system. However, further cleaning devices can also be installed directly in rainwater tanks. Appropriate integrated constructions are possible, for example, with rainwater tanks and pipe sedimentation systems:

• Pipe sedimentation systems (RSA) are usually made of plastic and designed for underground installation, but can also be installed/retrofitted in rainwater tanks if they are made of steel or stainless steel. For this purpose, the RSA are distributed over the tank floor at certain intervals without the usual starting shaft, so that the inflow takes place directly from the tank into the RSA and the RSA empty together with the tank when the tank is emptied.

The elevations can be designed in such a way that the flushing devices that are usually present in the rainwater tanks (such as flushing buckets or vortex jets) can continue to be used and only small dead zones form behind the elevations of the RSA. Subsequent installation of RSA is usually possible in the required number of the usual lengths as well as the widths and depths of the pools and RSA. If necessary, additional RSA are to be installed in the ground.

Just like the tank bottoms of the rainwater tanks, the RSA rise slightly towards the outlet, so that there are usually no large elevation heights. In addition, the RSA running empty with the pools consume almost no storage volume ments of the stormwater tank and may even improve the flow and sedimentation in the tank by reducing the flow velocities in the lower tank area and then allowing the rainwater tank itself to act like a pipe sedimentation.

Only the construction of the drains of the RSA from the rainwater basin requires greater effort. Pumps and pressure lines are usually the simplest way to control the discharge of the RSA in a controllable manner and independently of the sewage overflow from the rainwater tank. A pump can draw off discharges from two or more RSA together and forward them via a common pressure line. The pressure lines are smaller and more variable in terms of routing than gravity lines, which have to be routed out of the basin through low-lying and sufficiently large wall crossings.

In some cases, the RSA can also be discharged through a lateral tank wall or the rear tank wall below the clarification slot, e.g. into the channel behind it, where or from where pipe-bound forwarding takes place.

In any case, a pump solution allows and simplifies the realization of an automated flushing of the RSA and the loading of the downstream cleaning device. The pumps do not have to be located at the end of the RSA or in the rainwater tank. It is sufficient if the suction lines between the RSA and the pumps can fill up and vent freely when the pool is backed up.

A RSA connected in parallel to the stormwater tank can therefore basically also be installed in a stormwater tank or retrofitted to an existing stormwater tank. In the case of RSA consisting of several units, a divided installation in and next to the rainwater tank or divided in a parallel and downstream arrangement to the rainwater tank is also conceivable.

An integration of the system control and/or the second cleaning device in the stormwater tank is on the one hand rather complex and on the other hand only necessary in exceptional cases due to the small space requirement and the flexible positioning when using feed pumps in/on the stormwater tank.

• Eine kleine Regenkläranlage kann in ihrer einfachsten Form z.B. aus einer Rohrsedimentationsanlage (als erste Reinigungseinrichtung) bestehen, deren Startschacht vergrößert ist oder der ein separater Speicherraum/-schacht (als Regenbecken) vorgeschaltet ist. Der Startschacht erhält einen zweiten, höherliegenden Ablauf, der als Becken- bzw. Klärüberlauf zum Gewässer dient. In den Endschacht kann ein Filter integriert oder diesem nachgeschaltet sein. Bei integriertem Filter (als zweiter Reinigungseinrichtung) wird dem Ablauf des Endschachtes ein Drosselschacht (zur Anlagensteuerung) nachgeschaltet. Bei nachgeschaltetem Filter kann ein zweiter Drosselschacht für eine flexiblere Anlagensteuerung nachgeschaltet sein.

In a further development of the rainwater treatment plant, a simplified plant control system can be provided with passive throttles instead of with active sliders/valves or pumps. To compensate, the individual system components are dimensioned somewhat more generously, which is more economical and efficient than a complex system control system. The simplified system control is particularly suitable for use with smaller rainwater treatment systems. Structurally, a small rainwater treatment plant basically corresponds to a larger one:

• In its simplest form, a small rainwater treatment plant can consist of a pipe sedimentation plant (as the first cleaning device) with an enlarged starting shaft or a separate storage space/shaft (as a rainwater tank) upstream. The starting shaft has a second, higher outlet that serves as a basin or clarification overflow to the body of water. A filter can be integrated into the end shaft or can be connected downstream of it. With an integrated filter (as a second cleaning device), a throttle shaft (for system control) is installed downstream of the end shaft outlet. With a downstream filter, a second throttle shaft can be downstream for more flexible system control.

Alternatively, the end shaft can be enlarged so that a throttle can be arranged in this shaft at the outlet of the sedimentation pipe and at the inlet of the filter. All flows are then determined from the end manhole.

In all variants, the throttles are set to specific, fixed flow rates. A smart and/or dynamic control is relatively complex for smaller RKA.

Further details and advantages of the solution result from the following exemplary embodiments explained with reference to figures.

• 1 eine schematische Darstellung einer Regenwasserbehandlung gemäß Stand der Technik;
• 2 eine schematische Darstellung einer Regenkläranlage gemäß einer ersten erfindungsgemäßen Ausführungsform;
• 2a eine schematische Darstellung einer Regenkläranlage gemäß einer zweiten erfindungsgemäßen Ausführungsform;
• 2b eine schematische Darstellung einer Regenkläranlage gemäß einer dritten erfindungsgemäßen Ausführungsform;
• 2c eine schematische Darstellung einer Regenkläranlage gemäß einer vierten erfindungsgemäßen Ausführungsform;
• 3 eine schematische Darstellung einer Regenkläranlage gemäß einer fünften erfindungsgemäßen Ausführungsform;
• 4a eine schematische Darstellung einer Regenkläranlage gemäß einer sechsten erfindungsgemäßen Ausführungsform;
• 4b eine schematische Darstellung einer Regenkläranlage gemäß einer siebten erfindungsgemäßen Ausführungsform;
• 5a eine schematische Schnittdarstellung in Seitenansicht einer Regenkläranlage gemäß einer achten erfindungsgemäßen Ausführungsform;
• 5b eine schematische Schnittdarstellung in Seitenansicht einer Regenkläranlage gemäß einer neunten erfindungsgemäßen Ausführungsform;
• 5c eine schematische Schnittdarstellung in Seitenansicht einer Regenkläranlage gemäß einer zehnten erfindungsgemäßen Ausführungsform;
• 6a eine schematische Schnittdarstellung in Seitenansicht einer erfindungsgemäßen Regenkläreinrichtung; und
• 6b eine schematische Schnittdarstellung in Draufsicht einer erfindungsgemäßen Regenkläreinrichtung.

Show it:

• 1 a schematic representation of a rainwater treatment according to the prior art;
• 2 a schematic representation of a rainwater treatment plant according to a first embodiment of the invention;
• 2a a schematic representation of a rainwater treatment plant according to a second embodiment of the invention;
• 2 B a schematic representation of a rainwater treatment plant according to a third embodiment of the invention;
• 2c a schematic representation of a rainwater treatment plant according to a fourth embodiment of the invention;
• 3 a schematic representation of a rainwater treatment plant according to a fifth embodiment of the invention;
• 4a a schematic representation of a rainwater treatment plant according to a sixth embodiment of the invention;
• 4b a schematic representation of a rainwater treatment plant according to a seventh embodiment of the invention;
• 5a a schematic sectional representation in side view of a rainwater treatment plant according to an eighth embodiment of the invention;
• 5b a schematic sectional representation in side view of a rainwater treatment plant according to a ninth embodiment of the invention;
• 5c a schematic sectional representation in side view of a rainwater treatment plant according to a tenth embodiment of the invention;
• 6a a schematic sectional representation in side view of a rain clarifier according to the invention; and
• 6b a schematic sectional representation in plan view of a rain clarifier according to the invention.

1 shows a schematic representation of a rainwater treatment according to the prior art. The rainwater treatment includes at least one rainwater overflow 10, which provides overflowing rainwater. The rainwater can, for example, be supplied to the rain overflow 10 from a canal or a storage structure. Furthermore, the rainwater treatment includes a rainwater tank 20. Part of the rainwater that accumulates at the overflow runs through the rainwater tank 20 before it is fed to a body of water, whereas another part of the rainwater is fed directly to a body of water G.

2 shows a schematic representation of a rainwater treatment plant 1 according to a first embodiment of the invention. The rainwater treatment plant 1 comprises at least one rainwater overflow 10 and at least one rainwater tank 20 downstream of the rainwater overflow 10 for rainwater or mixed water with an overflow 22 in the tank outlet (clarification overflow).

The rainwater treatment plant 1 also has at least one cleaning device 30 . The first cleaning device 30 is arranged in such a way that water from the rainwater tank 20 can be applied to it.

Furthermore, the first cleaning device 30 is connected to the rainwater tank 20 in such a way that, depending on the situation, in particular depending on the fill level of the rainwater tank 20, the further rainwater treatment 30 can be supplied with water from the rainwater tank 20 to empty the rainwater tank 20.

The rainwater purification system 1 also has a system controller 40 . The system controller 40 is designed to control the operational interaction of the first cleaning device 30 and the rainwater basin 20 .

The system controller 40 is designed to control or regulate the rainwater throughput through the rainwater tank 20 and the first cleaning device 30 . The system controller 40 is connected downstream of the cleaning device 30 to control the outflow from the cleaning device 30 . The system controller 40 is preferably connected directly downstream of the cleaning device 30 .

The system controller 40 is connected downstream of the cleaning device 30 in order to achieve maximum cleaning performance and to prevent the rainwater basin 20 from overflowing.

The system controller 40 is designed to control and/or regulate the throughput as a function of the expected inflow of rain.

For this purpose, the system control 40 has a throughflow control or throughflow regulating device 42 . As a result, the flow through the first cleaning device 30 can be regulated or controlled depending on the expected inflow of rain.

The first cleaning device 30 is connected to the rainwater tank 20 in such a way that, depending on the situation, in particular depending on the time of year and/or the degree of pollution of the catchment area or the quantity or pollution of the water discharge, the first cleaning device 30 is filled with rainwater or combined water from the inlet or Drainage of the rain basin 20 can be acted upon.

With regard to the first embodiment, it is advantageous to dimension the first cleaning device 30 to the same throughput of (e.g. 15 l/s/ha) as the rainwater tank 20 itself (e.g. the pipe sedimentation in the rainwater tank) or the rainwater tank 20 by the post-cleaning quantity measure increased throughput.

The cleaning device 30 can be a pipe sedimentation system and/or a lamellar separator.

2a shows a schematic representation of a rainwater treatment plant 1 according to a second embodiment of the invention. The second embodiment is based on the first embodiment, only the differences between the second and the first embodiment being described below.

According to 2a the rainwater tank 20 has a clarification overflow 22 via which water can be fed to the body of water G and/or the first cleaning device 30 . The system controller 40 is designed to control or regulate how much water is supplied to the first cleaning device 30 .

The rainwater tank 20 and the first cleaning device 30 are connected in series with the rainwater overflow 10 .

The rainwater treatment system 1 also has a second cleaning device 50, such as a filter and/or adsorber, which is preferably connected downstream of the system controller 40 so that the inflow to the second cleaning device 50 can be regulated or controlled.

The system controller 40 is arranged between the first cleaning device 30 and the second cleaning device 50 . Furthermore, the system control 40 is combined centrally. Furthermore, the system controller 40 is designed to supply water directly to the body of water G, so that the system controller can supply water to the second cleaning device 50 and/or directly to the body of water.

2 B shows a schematic representation of a rainwater treatment plant 1 according to a third embodiment of the invention. The third embodiment is based on the second embodiment, only the differences between the third and the second embodiment being described below. According to 2 B the rainwater tank 20 has a double overflow 22' (clarification overflow with an upstream overflow/drain to the first cleaning device).

2c shows a schematic representation of a rainwater treatment plant 1 according to a fourth embodiment of the invention. The fourth embodiment is based on the second embodiment, only the differences between the fourth and the second embodiment being described below. 2c has the stormwater tank 20 in a mixed series connection with an inlet to the first cleaning device 30 from the inlet and/or outlet of the stormwater tank 20 and another from the clarifier overflow of the stormwater tank 20 . Here, the system control 40 usually also extends to the selection of the process.

3 shows a schematic representation of a rainwater treatment plant 1 according to a fifth embodiment of the invention.

Rainwater treatment plant 1, like the one in 2-2c Rainwater treatment plants shown at least one stormwater overflow 10 and at least one stormwater tank 20 downstream of the stormwater overflow 10 for rainwater or mixed water with overflow 22 in the tank outlet (clarifier overflow). The rainwater treatment plant 1 has at least one first cleaning device 30 for rainwater or mixed water, which is connected in parallel and arranged in such a way that water from the rainwater tank 20 and/or its inlet can be applied to it.

Furthermore, the rainwater purification system 1 has a system control 40 for controlling the operational interaction of the first cleaning device 30 and the rainwater basin 20 .

The first cleaning device 30 is connected to the rainwater tank 20 in such a way that, depending on the situation, in particular depending on the fill level of the rainwater tank 20, the first further rainwater treatment 30 can be supplied with water from the rainwater overflow 10 or from the rainwater tank 20 to empty the rainwater tank 20.

The first cleaning device 30 is connected to the stormwater tank 20 in such a way that, depending on the situation, in particular depending on the time of year and/or the degree of pollution of the catchment area or the quantity or pollution of the water discharge, the first cleaning device 30 uses rainwater or combined water from the inlet or Drainage of the rain basin 20 can be acted upon.

The first cleaning device 30 and the rainwater tank 20 are arranged directly connected to the rainwater overflow 10 in parallel, so that the water from the rainwater overflow is distributed to the rainwater tank 20 and the first cleaning device 30 .

Furthermore, a bypass line B can be provided, which connects the rainwater tank 20 to the first cleaning device 30, wherein the cleaning device 30 can be charged with rainwater from the rainwater tank 20 to empty it, depending on the fill level of the rainwater tank 20.

The rainwater purification system 1 also has a system controller 40 which is designed to to control or regulate the flow of rainwater through the first cleaning device 30 .

The system controller 40 is connected directly downstream of the cleaning device 30 for the outflow control from the cleaning device 30 . Furthermore, the system control is centralized.

The rainwater treatment plant 1 can also have a second cleaning device 50 , such as a filter and/or adsorber, which is preferably connected downstream of the plant controller 40 . The system controller 40 is arranged between the cleaning device 30 and the second cleaning device 50 . The system controller 40 can distribute the water leaving the first cleaning device 30 to the second cleaning device 50 and the body of water G in a variable manner.

The system controller 40 has a plurality of throughput control or throughput regulating devices 42 .

The system controller 40 is designed to split the rainwater flowing into the rainwater treatment system 1 through the overflow 10 optimally between the storage volume of the rainwater tank 20 , the sewage overflow 22 of the rainwater tank 20 and the parallel cleaning device 30 .

According to 3 Rainwater tank 20 and cleaning device 30 can be loaded independently.

The rainwater tank 20 can be designed as a catchment, flow-through or composite tank, so that existing rainwater tanks can be used as part of a rainwater treatment plant 1 according to the invention.

The at least one cleaning device 30 can be embodied as a lamellar separator and/or as a pipe sedimentation system and can preferably have a high level of efficiency.

The design throughput through the stormwater tank 20 according to 3 only has to be flown through with 15 l/s/ha due to the parallel connection and there is no increase in flow by the flow of the first cleaning stage 30 .

The fifth embodiment of the rainwater treatment system according to the invention 3 thus offers up to six different ways in which water can flow through the rainwater treatment plant 1 in different ways.

• • Sedimentation und Flotation im Regenbecken 20 (optional mit zusätzlichem Feinrechen am Klärüberlauf 22) und/oder
• • Abscheidung in der Reinigungseinrichtung 30 (parallelgeschaltet; z.B. einer Rohrsedimentationsanlage RSA oder eines Lamellenabscheiders LA) und/oder
• • Filtration und/oder Adsorption in der nachgeschalteten zweiten Reinigungseinrichtung 50.

This results in the following process for clearing rain, with the following process steps being carried out:

• • Sedimentation and flotation in the stormwater tank 20 (optionally with additional fine screen at the clarifier overflow 22) and/or
• • Separation in the cleaning device 30 (connected in parallel; eg a pipe sedimentation plant RSA or a lamella separator LA) and/or
• • Filtration and/or adsorption in the downstream second cleaning device 50.

In a further development of the rainwater treatment plant, the rainwater tank can be a rainwater treatment tank or a rainwater overflow tank and can preferably be designed as a catchment, flow-through or composite tank or as a rainwater retention tank.
4a shows a schematic representation of a rainwater treatment plant 1 according to a sixth embodiment of the invention. The sixth embodiment is based on the second embodiment, only the differences between the sixth and the second embodiment being described below. According to the sixth embodiment, the rainwater tank 20 of the rainwater treatment plant 1 is designed as a rainwater retention channel, as a rainwater backwater channel or as a storage channel with rainwater overflow 22 . Water can be fed directly to the sewage treatment plant, the body of water G or the first cleaning device 30 from the rainwater retention channel, rainwater backwater channel or storage space channel. The system control 40 is arranged directly behind the first cleaning device 30 and the second cleaning device 50 is arranged behind the system control 40 .

4b shows a schematic representation of a rainwater treatment plant 1 according to a seventh embodiment of the invention. The seventh embodiment is based on the sixth embodiment, only the differences between the seventh and the second embodiment being described below. According to the seventh embodiment, the rainwater tank 20 of the rainwater treatment plant 1 is designed as a rainwater retention channel, as a rainwater backwater channel or as a storage channel with rainwater or sewage overflow 22 . According to the seventh embodiment, the rain or sewage overflow 22 is designed in two stages.

5a shows a schematic sectional view of a rainwater treatment plant 1 according to an eighth embodiment of the invention. The eighth specific embodiment is based on one of the previous specific embodiments, with the specifics of the implementation of the system controller 40 being explained below by way of example.

In the eighth embodiment of the rainwater purification system 1 according to the invention, a system control 40 is implemented with passive throttles 42 instead of with active sliders/valves or pumps, and the individual system components are dimensioned somewhat more generously. In the case of smaller systems, this is more economical and efficient than a complex system control 40 which provides dynamic active regulation, as has been described above. This approach is used in the 5a - 5c and the associated embodiments.

In its simplest form (tenth embodiment), a rainwater purification system 1 can, for example, comprise a pipe sedimentation system as the first cleaning device 30, the starting shaft 20 of which is enlarged to form the rainwater basin (cf. 5c ) or whose starting shaft 20 is preceded by a storage space/shaft (rain tank) (cf. 5a /5b; eighth and ninth embodiment). The starting shaft 20 receives a second, higher outlet 10, which serves as a rainwater / basin overflow 10 and clarification overflow 22 to the body of water G. A filter 50 can be integrated into the end shaft as a second cleaning device (cf. 5a) or be downstream of it (cf. 5b) . With an integrated filter 50, a throttle shaft for system control is installed downstream of the outlet of the end shaft (cf. 5a) . With a downstream filter 50, a separate second throttle shaft D ₂ can be downstream to improve system control and to stagger the flows through the first and second cleaning device 50 (cf. 5b) .

Alternatively, the end shaft can be enlarged so that a throttle Dr for system control can be arranged in this shaft at the outlet of the sedimentation pipe and at the inlet of the filter 50 (first and second cleaning device) (cf. 5c ). All flows are then determined from the end shaft E, which takes over the system control 40 (cf. 5c ).

6a shows a schematic side view in section of a rain clearing device 100 according to the invention.

6b a schematic side view in plan of the rain clarifying device 100 according to the invention, which is shown in side view in 6a is shown.

The rainwater treatment device 100 comprises a rainwater basin 20 and at least one first cleaning device 30', the at least one first cleaning device 30' being integrated into the rainwater basin 20.

The at least one first cleaning device is designed as at least one pipe sedimentation system 30'. According to 6b a plurality of tubular sedimentation plants 30', in particular five tubular sedimentation plants 30', are formed.

The at least one first cleaning device 30' is elevated. In one embodiment, each of the pipe sedimentation systems 30 ′ is elevated on stands 36 in the stormwater basin 20 .

The bottom of the rainwater tank 20 and preferably also the at least one first cleaning device 30 are arranged sloping towards the inlet of the rainwater tank 20 . A gradient of 2% is preferably formed.

Furthermore, the at least one first cleaning device 30 ′ is arranged in such a way that it can be charged with water from the rainwater tank 20 .

Furthermore, the rain clarifying device 100 has an outlet 60 which is connected to the at least one first cleaning device 30' and has at least one pump 62 and/or at least one pressure line 64 which is/are designed to discharge the water from the first cleaning device 30' to deduct.

The first cleaning device 30' can be partly integrated into the rainwater tank 20 and partly arranged next to the rainwater tank.

The pipe sedimentation systems 30' are usually made of plastic and designed for underground installation, but can also be installed/retrofitted in rainwater tanks 20 if they are made of steel or stainless steel. The pipe sedimentation systems 30' are distributed over the tank floor at certain intervals so that the inflow takes place directly from the rainwater tank 20 into the pipe sedimentation systems 30' and the pipe sedimentation systems 30' empty together with the rainwater tank 20 when the tank is emptied.

The elevations 36 can be designed in such a way that the usual or existing cleaning/flushing devices of the rainwater basin 20 can continue to be used and only small dead zones form behind the elevations of the pipe sedimentation systems 30'. Subsequent installation of the required number of pipe sedimentation systems 30' is possible, both of the usual lengths and of the widths and depths of the stormwater tanks and pipe sedimentation systems 30'. It can also Rohrsedimentationsanlagen 30 'in addition to the Rohrsedimentations systems 30' can be installed in the ground next to the rainwater tank 20.

Just like the tank bottoms of the rainwater tanks 20, the pipe sedimentation systems 30' rise slightly towards the outlet, so that there are usually no large elevation heights. The pipe sedimentation systems 30', which run empty with the stormwater tank 20, also use up almost no storage volume of the stormwater tank 20 and may even improve the flow and sedimentation in the stormwater tank 20 by reducing the flow velocities in the lower basin area and then allowing the stormwater tank 20 itself to act like a pipe sedimentation.

Only the construction of the drains of the pipe sedimentation systems 30' from the stormwater basin 20 requires greater effort. Pumps 62 and pressure lines 64 are provided in order to direct the flow of the pipe sedimentation systems 30' in a controllable manner and independently of the sewage overflow 22 from the stormwater tank 20. A pump 62 can draw off discharges from two or more pipe sedimentation systems 30 ′ together and forward them via a common pressure line 64 . The pressure lines 64 are smaller and more variable in terms of routing than gravity lines, which must be routed out of the rainwater tank 20 through low-lying and relatively large wall crossings in the filling area.

In part, the outflow of the pipe sedimentation systems 30' can also be realized through a lateral tank wall or the rear tank wall below the clarification slot, e.g. into the channel behind it, where or from where the outflow is piped on.

In any case, a pump solution allows or simplifies the retrofitting of the rinsing of the pipe sedimentation systems 30 ′ and the feeding of a downstream second cleaning device 50 . It is sufficient if the pressure lines 64 between the pipe sedimentation systems 30' and the pumps 62 can fill up and vent freely when the basin is backed up.

A tubular sedimentation system 30' connected in parallel with the stormwater tank 20 can therefore in principle also be installed in a stormwater tank 20 or retrofitted to existing stormwater tanks 20. Split installation in and next to the rainwater tank 20 or split in a parallel and downstream arrangement are also conceivable.

An integration of the system control 40 and the downstream filtration 50 in the stormwater tank 20 can also be provided, but is relatively expensive and on the other hand due to the small space requirement and the flexible positioning when using feed pumps in/on the stormwater tank 20 only necessary in exceptional cases.

The system controller 40 has at least one flow control and/or flow control device 42 .

Furthermore, the rain clarifier 100 can include a rinsing device 24 (e.g. tipping bucket or vortex jet).

Reference List

1

rainwater treatment plant

10

Storm overflow (also basin overflow)

20

rain basin

22

sewage overflow

22'

double overflow

24

Flushing device (e.g. flushing bucket or vortex jet)

30

cleaning device

30'

tube sedimentation plant

36

stand

40

plant control

42

Flow control or flow regulation device

44

Measuring device (e.g. for level, flow, turbidity)

50

second cleaning device

60

procedure

62

pump

64

pressure line

70

sludge treatment facility

100

rain clearing device

B

bypass line

G

bodies of water

Claims (18)

Rainwater treatment plant (1) comprising: a first cleaning device (30) for rainwater or mixed water, a rainwater tank (20) for rainwater or mixed water with an overflow, in particular in the tank outlet (22) and/or in the tank inlet (10), and a system controller ( 40) to control the operational interaction of the first cleaning device (30) and the rainwater tank (20). Rainwater treatment plant (1) after claim 1 , characterized in that the rainwater tank (20) is a rainwater settling tank, a rainwater overflow tank or a rainwater retention tank and is preferably designed as a catch, flow or composite tank. Rainwater treatment plant (1) after claim 1 or 2 , characterized in that the system controller (40) is designed to control or regulate the rainwater throughput through the rainwater tank (20) and the first cleaning device (30). Rainwater treatment plant (1) according to one of the preceding claims, characterized in that the plant control (40) has at least one throughflow control or throughflow regulating device (42). Rainwater treatment system (1) according to one of the preceding claims, characterized in that the rainwater treatment system (1) also has a second cleaning device (50), such as a filter and/or adsorber, which is preferably connected downstream of the system control (40) so that the inflow to the Cleaning device (50) can be regulated or controlled. Rainwater treatment plant (1) according to one of the preceding claims, characterized in that the rainwater treatment plant (1) has a sludge treatment device (70) which is designed separately from the first cleaning device (30) and the second cleaning device (50). Rainwater treatment plant (1) according to one of the preceding claims, characterized in that the first cleaning device (30) and the stormwater tank (20) are connected directly to a stormwater overflow (10) in parallel and/or a bypass line (B) connects the stormwater tank (20 ) connects to the first cleaning device (30), wherein the first cleaning device (30) can be charged with rainwater from the rainwater tank (20) depending on the fill level of the rainwater tank (20). Rainwater treatment plant (1) according to one of the preceding claims, characterized in that the rainwater tank (20) and the first cleaning device (30) are arranged in series with a rainwater overflow (10). Rainwater treatment system (1) according to one of the preceding claims , characterized in that the system control (40) is combined centrally and the first cleaning device (30) is connected downstream of the first, preferably immediately downstream, to control the outflow from the first cleaning device (30). Rainwater treatment plant (1) according to one of the preceding claims, characterized in that the first cleaning device (30) is connected to the rainwater tank (20) in such a way that, depending on the situation, in particular depending on the season, the degree of pollution of the catchment area, the quantity or pollution of the Rain inflow as a whole, the course and/or the water outflow, the first cleaning device (30) can be acted upon with rain or mixed water from the inflow or outflow of the rain basin (20). Rainwater treatment plant (1) after claim 10 , characterized in that the first cleaning device (30) is structurally integrated into the rainwater tank (20). Rain clearing device (100), comprising a rain basin (20) and at least one first cleaning device (30'), the at least one first cleaning device (30') being integrated into the rain basin (20). Rain clarifier (100), after claim 12 , characterized in that the at least one first cleaning device (30') is at least one pipe sedimentation plant (30'). Rain clarifier (100), after claim 12 or 13 , characterized in that the at least one first cleaning device (30 ') is elevated. Rain clarifier (100), according to one of Claims 12 until 14 , characterized in that the at least one first cleaning device (30') is arranged in such a way that it can be charged with water from the rainwater tank (20). Rain clarifier (100), according to one of Claims 12 until 15 , characterized in that the rain clarifying device (100) has an outlet (60) which is connected to the at least one first cleaning device (30') and has a pump (62) and/or a pressure line (64) which is designed for this purpose / are to deduct the water from the first cleaning device (30 '). Rain clarifier (100), according to one of Claims 12 until 16 , characterized in that the first cleaning device (30 ') is only partially integrated into the rainwater tank (20). Rainwater treatment plant (1) according to one of the preceding Claims 1 - 10 , characterized in that the first cleaning device (30 ') according to one of Claims 11 until 17 is trained.

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