WO2019101948A1

WO2019101948A1 - Waste water purifying system and method for purifying waste water

Info

Publication number: WO2019101948A1
Application number: PCT/EP2018/082415
Authority: WO
Inventors: Ralf Steeg
Original assignee: Ralf Steeg
Priority date: 2017-11-24
Filing date: 2018-11-23
Publication date: 2019-05-31

Abstract

The invention relates to a waste water purifying system and a method for purifying waste water. The waste water purifying system (10) comprises an inflow device (20) for supplying waste water to a waste water purifying device (12). The waste water purifying system furthermore comprises the waste water purifying device (12) having a waste water purifying volume (14) for purifying the waste water by means of aerobic microorganisms. The waste water purifying system furthermore comprises a drain device (22) for discharging purified waste water from the waste water purifying device (12) and a tube (30). The waste water purifying device (12) comprises a ventilation device (40) for supplying oxygen to the microorganisms, which has at least one efflux element (42) arranged in the waste water purifying volume (14) for the efflux of a gas or gas mixture. The waste water purifying volume (14) is arranged in the interior of the tube (30). The waste water purifying system (10) comprises a plurality of tubes (30), in each of which a waste water purifying volume (12) is arranged.

Description

Wastewater treatment system and process for wastewater treatment

The invention relates to a wastewater treatment system and a method for

Wastewater treatment.

Wastewater treatment plants for the treatment of wastewater, in particular for capacities of more than 5,000 population equivalents, are special facilities designed for individual cases. These include a large number of pelvis and modules to be constructed and provided separately, each designed for a single system. This implies that, taking into account the respective framework conditions such as wastewater composition, effluent concentration, proportion of industrial wastewater, temperature, spatial conditions, space requirements, and much more. respective calculations, plans and dimensions valid only for the respective case. In addition, each basin to be built is individually sized and it must provide the necessary static evidence.

It can be seen that high planning and construction costs arise in this way. Planning and construction are highly dependent on the available space. Once a plant has been built, it can hardly be adapted to changing conditions. Also, due to the fixed installation of the structures, a transport of sewage treatment plants is not possible because you can not transport concrete pools.

US Pat. No. 7 510 649 B1 describes a wastewater treatment system with an open-topped bed of particulate material, through which wastewater to be treated can seep. Aquatic plants may be arranged in the treatment bed. The treatment bed is placed in a watertight container. The wastewater treatment system includes a sequencer having a vertical flow control tube with vertically spaced and selectively openable outlets for controlling the wastewater leech in the treatment bed. Thus, a control of the residence time of the wastewater in the treatment bed can be done.

US 9,675,907 discloses a modular dewatering system for removing water from a wastewater mixture of water and particulate solids. It describes a fixed bed reactor in which by means of a porous filter layer water is separated from the solids. The drainage system is modular in such a way that it can be transported in individual parts or assemblies, for example wall sections of the container. It can be assembled, used, disassembled and stored in transport racks. EP 3 005 866 A1 describes an aquaponic system for growing aquatic organisms in aquaculture and the associated cultivation of plants in hydroponic culture. The contaminated by the cultivation of organisms water is used as a nutrient for the plants and purified by the plants water is used as fresh rearing water for receiving the organisms. The pelvis for growing the organisms is designed as a biofloc basin, which can absorb in the body of water consisting of leftover food and excrement Biofloc particles.

US 2010 0 105 125 A1 and US 2011 0 068 057 A1 show systems, devices and methods for the cultivation of microorganisms. A container for cultivating microorganisms comprises a housing for receiving water and microorganisms, a feed for introducing carbon dioxide into the housing, and a growth carrier for growing algae with at least partial consumption of the carbon dioxide with an elongated section and a plurality of protruding loop elements. Also, the purification of waste water with air supply is possible. In one method, the growth carrier may be rotated within the housing.

In US 5 043 061 there is described a waste water treatment and evaporation apparatus comprising a treatment tank, a sediment layer with gravel for sedimentation of sludge, and an evaporation unit operated by capillary force to evaporate the purified waste water into the atmosphere.

US 9 556 038 B2 discloses a circulating wastewater treatment system and process for wastewater treatment. The system comprises two separation tanks connected in series and trickle material for gravity-driven flow through the wastewater to be treated. A pump conveys the wastewater from a second separation tank by means of a spray nozzle on the trickle material, from where it flows back into the first separation tank.

The so-called tower biology, also referred to as Bayer T urmbiologie describes an aerobic wastewater treatment plant, which is arranged in high closed steel containers, the so-called towers.

CN 107 001 086 describes a water treatment module with an elongated gas container having a gas inlet and two vertical walls. At least one wall is impermeable to water and is facing a gas with one side and facing water with one side. A gas-permeable membrane is disposed between the water outside the housing and the gas within the housing. The housing is spirally or convolutely defined to define a horizontal path with one or more water treatment volumes disposed on depressed sides of the housing. US 2010 0 264 084 A1 discloses a device for water treatment with a device for removing water constituents and a device for adsorption of ions. A hollow fiber module is used to separate solids such as sludge particles from water.

Furthermore, it is known that mechanical, chemical and / or biological processes can take place within the sewage system, which can serve to remove wastewater constituents.

It is the object of the invention to provide a particularly simple and cost-effective waste water purification system and a corresponding process for the purification of wastewater while remedying the disadvantages mentioned.

The object is achieved by the wastewater treatment system according to claim 1 and by the method for wastewater treatment according to claim 10. Embodiments of the wastewater treatment system are specified in subclaims 2-9.

A first aspect of the invention is a waste water purification system comprising a feed device for supplying waste water to a waste water purification device, the waste water purification device having a waste water purification volume for purifying the waste water by aerobic microorganisms, a drainage device for discharging purified waste water from the waste water purification device, and a pipe. The wastewater treatment device has a ventilation device for sow erstoffversorg u ng the microorganisms with at least one arranged in the wastewater purification volume outflow to the outflow of a gas or gas mixture. The wastewater purification volume is arranged inside the pipe. The wastewater treatment system comprises a plurality of tubes, in each of which a wastewater purification volume is arranged.

Wastewater includes municipal wastewater, any industrial or commercial wastewater or a mixture of different wastewater. It may include greywater, yellow water, black water, brown water, process water, rainwater, extraneous water, etc.

A wastewater treatment device is a device which is suitable for at least partially removing at least one substance from wastewater. In particular, a municipal and / or industrial treatment plant is meant. The purification of the wastewater means the reduction of the concentration of at least one substance contained in waste water. Typically, substance means a substance dissolved in the wastewater, such as an organic carbon compound. In particular, the wastewater treatment device is designed to remove a large number of dissolved wastewater constituents, so that they can be used as intended for the purpose of reducing sum parameters, such as chemical oxygen demand, COD, biochemical oxygen demand, BOD ₅ , and / or dissolved organic carbon, DOC, so that limits can be met in treated wastewater. These can be official or predetermined valid limit values or self-imposed limit values.

A wastewater purification volume means a volume for wastewater treatment. It can be at least partially bounded by the wall of the pipe. In particular, it is completely bounded along the radial direction by the wall of the tube.

The wastewater treatment system may include a plurality of wastewater treatment facilities that may be connected in series or in parallel. It may also have other devices or modules for wastewater treatment.

In particular, the wastewater treatment device has a multiplicity of tubes in which wastewater purification volumes are arranged. These can be connected in parallel.

In particular, the wastewater treatment device is designed for at least partial biological or biochemical removal of the at least one substance by means of microorganisms, ie in particular by means of the metabolic activity of aerobic chemoorganoheterotrophic microorganisms, which are also referred to as activated sludge. In other words, the wastewater treatment facility has a biological stage for aerobic biological wastewater treatment. The wastewater treatment device is suitable for removing wastewater constituents under aerobic conditions, in particular under the supply of air or oxygen. It is especially designed for continuous operation.

A tube according to the invention is an elongate hollow body whose length is typically greater than the diameter thereof. Typically, a tube has a constant cross-section over its longitudinal extent or length. It may nevertheless have cross-sectional extensions. This may be a circular cross section, but other cross sections such as an egg profile, a mouth profile or any other cross sections are possible. A circular cross-section is characterized by a low surface-to-volume ratio, optimum strength and stiffness properties as well as good transportability. A pipe according to the invention is characterized by the industrial, factory manufacturability of the entire pipe cross-section. In particular, hollow sections which are composed of individual segments or which have been constructed in sections or in layers over relatively long periods of time are not pipes in the sense of the invention. A segment here means a part which extends at a radial angle of less than 360 °, in other words a radially non-closed cross section. A round, poured concrete and / or brick basin is not a pipe in the context of the invention. Typically, seamless tubes are meant.

The total length of the pipe may be between 10 m and 500 m, in particular between 25 m and 150 m, and in one embodiment between 40 m and 65 m. In this way, suitable wastewater purification capacities for villages and towns can be made available.

The ventilation device is adapted for introducing oxygen or oxygen-containing gas or gas mixture into wastewater to be purified, in partially purified wastewater or in a wastewater-microorganism mixture. In particular, air is meant so that the ventilation device is arranged to introduce ambient air. This may be connected to a compressor for compressing ambient air to provide compressed air, which may also be included in the ventilation device. This is in particular also arranged in the interior of the tube.

The outflow element means the one outflow opening to the outflow of the gas or gas mixture forming material. This can have a plurality of outflow openings. It can be configured as a surface aerator or depth aerator, for example as a disk ventilator or plate aerator.

In particular, the wastewater purification volume is arranged in a section of the pipe. In other sections, further aggregates or modules may be arranged. In particular, the entire wastewater treatment device is arranged inside the tube. Since the discharge element is arranged in the wastewater purification volume, which in turn is arranged in the interior of the tube, the discharge element is also arranged in the interior of the tube. In particular, it is an independent unit which is fixed in the interior of the pipe, for example on its inner wall. The wastewater purification volume may be delimited at least partially and in particular substantially from an inner wall of the pipe.

The wastewater purification volume is designed to accommodate aerobic microorganisms that can remove water constituents while supplying oxygen. During normal operation, it is typically substantially filled, ie at least 70%, in particular at least 80%, and in one example at least 90% of the maximum fill level, in the case of a pipe section of its diameter. The wastewater treatment system can have at least one anoxic volume, which in particular is likewise arranged in a pipe or in the pipe. This is designed to absorb anoxic or anaerobic microorganisms and is used for denitrification. Furthermore, the wastewater treatment device may comprise a separation device for separating the microorganisms, for example by means of gravity-driven separation, for example settling tanks, centrifugal-driven separation, for example cyclones, by means of membrane separation processes such as ultrafiltration or microfiltration or by means of flotation. The wastewater purification volume and the separator are fluidically connected, for example by means of a pipeline. The separating device is in particular arranged completely inside the tube. Typically, membrane modules are used. These can be immersed in separating basins, which are also arranged in particular inside the tube.

In particular, the wastewater treatment facility is adapted for wastewater purification by means of the activated sludge process. The wastewater treatment volume is designed in this case as an aeration tank. The separating device may have a separating volume in which, at least in some areas, a higher solids concentration can be realized than in the activation region. In particular, the biological stage comprises a recirculation device, typically comprising a recirculation pump, for recycling activated sludge from the separation volume into the activation area. The recirculation device can be set up such that a sludge age of between 10 and 90 days is achievable, in particular between 20 and 65 days and, for example, between 30 and 55 days. In this way, an aerobic sludge stabilization can take place, which is advantageous in terms of sludge disposal.

The tube may have an inner or outer diameter between 2 m and 8 m, in particular between 3 m and 5 m and in one example between 3.5 m and 4.5 m. In this way, it is possible to realize a wastewater treatment system that is easy to transport on a truck and otherwise dimensioned on the one hand, which is suitable for cleaning at least 50 m ³ / d, in particular at least several hundred m ³ / d of wastewater.

The wastewater treatment system or the wastewater treatment device can be designed to reduce the BOD ₅ concentration to below 10 mg / L, in particular below 5 mg / L. They can be designed to reduce the COD concentration to below 60 mg / L, in particular below 30 mg / L. It can be set up to reduce COD by at least 90%. Furthermore, the wastewater treatment system or the wastewater treatment device can be set up for nitrogen removal. They may or may be adapted to reduce the total nitrogen concentration below 20 mg / L, in particular below 10 mg / L. They can or can be set up to realize a degree of nitrogen degradation of more than 70%, in particular more than 80%. They can or can be set to reduce the ammonium nitrogen concentration to below 6 mg / L, in particular below 1, 5 mg / L his. Furthermore, the wastewater treatment system or the wastewater treatment device can be set up for phosphorus removal. They may or may be adapted to reduce the total phosphorus concentration to below 2 mg / L, in particular below 1 mg / L.

The inlet device and the drainage device are line elements for conducting wastewater or purified wastewater. The inlet device serves to supply the waste water to the wastewater treatment device. The wastewater can be, for example, from an entry point, such as a mouth of a sewer or pipe or a pretreatment stage, be conducted to the inlet device. It may also be deliverable from another module of the wastewater treatment system, such as a mechanical pre-treatment device. The drain device is used for the discharge of the purified wastewater from the wastewater treatment facility to a drain point, such as a drainage structure or an outlet into a body of water. It may also be arranged to drain to another module, such as a downstream treatment stage, of the wastewater treatment system.

It can be arranged within the tube, at least one conduit element, such as a hose or hose section or a pipe or pipe section, which is suitable for supplying or discharging the wastewater to or from the wastewater treatment device. Here, not the pipe itself, in which the wastewater treatment device is seconded, serves as a conduit element for the supply or discharge of the wastewater or purified wastewater.

In particular, the wastewater treatment system or the wastewater purification device is set up so that at least one parameter of the distance can be set. In this way, for example, the concentration reduction of the at least one substance in terms of feed quality, amount, be adapted to the desired effluent quality and / or conditions such as the temperature.

In other words, an aeration tank arranged at least substantially in a pipe or a sewage treatment plant or purification stage arranged essentially in a pipe is made available. The wastewater treatment device, the associated modules such as aeration devices and other units, line elements, etc. are particularly firmly installed in the pipe so that they are transportable with the pipe. They can be arranged one behind the other in different sections of the pipe. In particular, the wastewater treatment system comprises such additional facilities, so that it is set up for a complete wastewater treatment in accordance with the respectively valid requirements. In this way, a simple and flexible transportable and quickly and inexpensively installable wastewater treatment system provided.

In one embodiment, all the facilities required for the treatment of the wastewater, as described in the present application, arranged in the interior of the tube or tubes.

In addition, there is the advantage that the wastewater treatment system is encapsulated odor-tight due to the arrangement of the discharge elements in the pipe. In other words, structurally created the possibility to avoid the resulting in conventional wastewater treatment systems or sewage treatment odors of the environment in a very simple manner. For example, an exhaust air purification device for conditioning the resulting exhaust air may be arranged in fluidic connection with the pipe or the pipes.

Furthermore, the arrangement of the outflow elements in the tube has the advantage of improved gas introduction, since a flow of the gas bubbles along the inner wall of the tube is possible. With a pipe diameter of 4 m, a theoretical flow path along the inner wall of more than 6 m can thus be realized. The efficiency of the gas input in the wastewater treatment device according to the invention is thus comparable to significantly lower levels of conventional wastewater treatment facilities, which are associated with significantly higher costs. Also, the gas input is improved because unused oxygen can not easily escape into the atmosphere, as is the case with conventional activated sludge tanks. The gas input is easier to control because the exhaust air composition is easily measurable due to the described encapsulation.

In the wastewater treatment device according to the invention no algae growth takes place in comparison to conventional sewage treatment plants, since no light falls on the wastewater to be treated or treated. This significantly reduces the necessary maintenance and thus enables cost-effective operation.

Another advantage of the wastewater treatment system according to the invention is the possibility of standardized dimensioning and high volume production. The aggregates and facilities of the wastewater treatment system, such as the wastewater treatment facility with the aeration device, can be optimally matched to each other and a proven system can be used in different areas. A suitably dimensioned system can be produced at significantly lower costs than conventional sewage treatment plants due to the high quantities.

Also, only little to no concrete is used for the production, so that formwork, introduction of reinforcing steel and concreting work accounts and no time is needed for curing or drying of concrete. In this way, the commissioning can be done much faster. It is of course not excluded that some structures, such as inlet and / or drain structures or service buildings, are made of concrete in a conventional manner.

Also, a large part of previously customary planning tasks, as the static calculation of buildings due to the pipes used, which are prefabricated structures, can be reduced to a minimum. Once carried out static calculations can be transferred to other produced wastewater treatment systems. Typically, there are known static characteristics for pipes, so that they can be used without their own calculations.

In particular, the wastewater purification volumes arranged in a plurality of pipes can be connected to one another in such a way that they can be operated in parallel. The

Wastewater treatment system can be a distributor for dividing a to be cleaned

Have volume flow of the waste water to a plurality of wastewater treatment volumes, wherein the manifold is designed in particular as a pipe with a plurality of openings for connecting a respective wastewater treatment volume. The wastewater treatment system may have a collecting device for combining a plurality of purified volume flows from a plurality of wastewater purification volumes, wherein the collecting device is configured, in particular, as a pipe with a plurality of openings for connecting a respective wastewater purification volume.

The wastewater treatment system may comprise at least one sensor for detecting information about a concentration or cargo of at least one ingredient of the wastewater to be purified and a control device for controlling the

Flow control devices for the purpose of regulating the flow path of the wastewater to be purified in the wastewater treatment system, so that the wastewater purification volume and / or anoxic volume required to maintain at least one predetermined effluent quality parameter of the purified wastewater is adjustable. For example, a cargo of organic matter could be determined, such as by spectral analysis, and selectively provide the required pelvic volume by opening or closing suitable flow control devices for use or exclusion of certain tubes or pipe sections to meet predetermined drainage levels.

The parallel operation of the tubes makes it possible to carry out a large number of parallel examinations or test and / or measurement series, since a separate aerobic and / or anaerobic or anoxic wastewater treatment can be carried out in each of the tubes. In particular, at least one tube and, for example, all tubes are subdivided by means of suitable separating plates and have an anoxic volume for denitrification in addition to the aerated or aerated wastewater purification volume. A partition plate means a partition wall or an arbitrarily shaped separating device. It can completely close the pipe cross-section or form an opening in the upper area, for example leave the top 20 cm of the pipe cross-section open, so that the wastewater to be cleaned or at least partially cleaned can flow freely above this threshold above a certain level.

The connections between pipes and manifolds and / or between multiple pipes may be manually and / or automatically opened or closed by means of flow control devices such as valves or valves. Outflow elements can be manually and / or automatically switched on or off. In this way, during operation of the wastewater treatment system, the ventilated volume, the anoxic volume and / or any other volume can be increased or decreased.

In one embodiment, the pipes having wastewater purification volumes are arranged such that respective longitudinal axes of the pipes are arranged parallel to one another. In this case, the tubes can be arranged next to one another and / or one above the other. In particular, distributors and / or collectors are aligned and connected substantially at right angles to the tubes having wastewater purification volumes.

In other words, in order to purify large amounts of the waste water, the wastewater treatment system includes a plurality of wastewater purification volumes arranged inside respective tubes. Thus, the entire wastewater purification volume of the wastewater treatment plant or the wastewater treatment system can be provided by pipes.

Typically, the wastewater treatment system has a plurality of tubes with corresponding wastewater purification volumes. For example, the wastewater treatment system may include more than 50 pipes with respective wastewater treatment volumes to achieve sufficient wastewater purification capacity for the wastewater of several million inhabitants. The wastewater treatment system may comprise a plurality of tubes, in each of which a wastewater purification volume of a wastewater treatment device is arranged. These can be arranged one behind the other, side by side and / or one above the other.

An embodiment of the wastewater treatment system is characterized in that the wastewater treatment system at least two waterproof connected to the pipe Having end plates for sealing at least the wastewater treatment device from the environment. Thus, the wastewater treatment system can be operated in an at least partially submerged state of the pipe. In particular, the end plates are arranged such that they seal substantially the entire volume enclosed by the tube from the environment. Thus, at each boundary of the longitudinal extent of the tube in each case a water-tight connected to the pipe end plate for sealing the volume enclosed by the tube may be arranged.

In other words, along the longitudinal extent of the tube, at least two end plates are arranged, which waterproof seal a portion of the tube between each other. They seal the cross-section of the tube waterproof and in particular airtight. At least the end plates are set up to seal the wastewater treatment volume from the environment. They can be aligned perpendicular to the longitudinal direction of the tube. In particular, they have a shape which corresponds to the cross-sectional shape of the tube, in particular a circle.

In one embodiment, the end plates are arranged at both ends of the tube. In this case, slight distances between the end plate and the boundary of the tube, ie tube end, of less than 10%, in particular less than 5% and typically less than 2% of the total length of the tube are possible. An arrangement of the end plate with a slight distance from the boundary of the tube, so not quite at the end, but slightly indented, for example, can serve to increase the rigidity and / or improved attachment or sealing.

This serves to seal off at least the section of the pipe in which the wastewater treatment device is arranged from the environment of the pipe or wastewater treatment device, so that the operation of the wastewater treatment device or the waste water purification system is not prevented by media located in the environment, such as z. As water or soil, is impaired and no wastewater from the pipe can penetrate into the environment. In particular, all other openings or accesses in the pipe wall are watertight sealed or closed. However, this does not rule out that the wastewater treatment system has a discharge for the targeted discharge of the purified waste water in the surrounding water pipe. The drainage device may be fluidly connected to such a drainage device, which may be included in the wastewater treatment system.

In other words, the wastewater treatment system is adapted to realize its intended operation in an at least partially and possibly completely immersed in water condition of the tube. The intended operation means the wastewater treatment, ie the reduction of the concentration of at least one substance contained in wastewater, by means of aerobic microorganisms, possibly the ventilation, and in particular the supply of waste water to the wastewater treatment device by means of the feed device and the discharge of purified wastewater by means of the drainage device.

The wastewater treatment system may include other means necessary or useful for realizing submerged operation of the pipe, such as a gas discharge means for discharging gases from an aeration tank to the atmosphere and / or suitable sealing members for sealing the wall of the pipe or the like End plates passing through line elements.

Of course, the positioning of the sewage treatment system is not limited to the arrangement of the pipe in the water, but the pipe can also be placed underground or above ground. The wastewater treatment system can be coupled to a foundation to fix it at its destination position. The foundation can for example be attached to the bottom of a body of water in which water the pipe should be arranged. The wastewater treatment system may comprise the foundation.

This results in the advantage that the wastewater treatment system can be variably positioned. In particular, no space on land is necessary. Thus, no excavation or civil engineering to install the wastewater treatment system is necessary, which significantly reduces the cost. Also, the availability of suitable land plots is often problematic, especially in cities that have been underserved so far despite their size with wastewater treatment capacity and in which the future installation of suitable wastewater treatment plants is necessary. On the other hand, the system according to the invention makes it easy to resort to river or lake areas, which moreover often are communal property, and over which it may be easier to dispose of them. Another advantage is that the supply of wastewater to be cleaned is often possible without major investment, since the wastewater in the absence of a sewage treatment plant anyway takes the way to the next watercourse. Thus, the wastewater treatment system according to the invention may optionally be installed where the wastewater is produced anyway. Since the wastewater treatment system can be positioned where the existing sewage system discharges into the water, no new pipes have to be built to connect the plants to the existing sewage system. Also, the discharge of the purified wastewater is easier and cheaper than conventional sewage treatment plants, as a simple direct introduction into the surrounding water pipe is possible. The wastewater treatment system can clean at low wastewater attack, such as at night, additional water, such as water of a water body in which the wastewater purification volume having pipe is located. In one embodiment of the wastewater treatment system, the wastewater treatment device is designed and arranged in the tube so that it can be operated in a horizontal orientation of the tube.

In other words, the wastewater treatment device is designed and arranged in the pipe that it is adapted for wastewater treatment in a horizontal orientation of the tube. The intended operation is therefore carried out in a horizontal orientation of the tube. For this purpose, in particular, the wastewater treatment device and at least some of the possibly present upstream or downstream devices and the line elements for transporting the wastewater or the purified waste water are arranged one behind the other along the longitudinal extent of the tube in the interior. The term wastewater hereby includes partially purified or treated water qualities or streams. The outflow elements are fastened in particular in the interior of the tube on the wall thereof.

The horizontal orientation of the tube means a horizontal orientation of the longitudinal axis of the tube. Horizontal means perpendicular to the respective gravity direction.

This has the advantage that, despite the low overall height and the associated low static requirements, large tank volumes and thus high volumetric cleaning capacities can be achieved. The transport of the tubes, which are at least partially prefabricated or equipped with corresponding modules or devices, can take place in the intended orientation, so that it is further simplified or less preparatory measures have to be taken in the tube. The installation and fixation is simple and inexpensive. There are no civil engineering works necessary because it is built only in relatively small height and thus a deep anchorage is not necessary.

In one embodiment of the wastewater treatment system, the wastewater treatment device is designed and arranged in the tube so that it can be operated in a vertical orientation of the tube.

In other words, the wastewater treatment device is configured and arranged in the pipe so that it is adapted for wastewater treatment in a vertical orientation of the pipe. The intended operation is therefore in vertical alignment of the tube. For this purpose, in particular the outflow elements in the interior of the tube at its arranged at the axial end wall, in particular on a front plate, attached.

The vertical orientation of the tube means a vertical orientation of the longitudinal axis of the tube. Vertical means along the current direction of gravity. This embodiment has the advantage that a particularly space-saving wastewater treatment facility can be provided, which is desirable, for example, in densely populated areas such as large cities. In addition, the efficiency of the gas input in the ventilation through the longer flow path compared to conventional wastewater treatment plants is significantly increased.

Another embodiment of the wastewater treatment system is characterized in that the tube is made essentially of plastic, in particular of a fiber-plastic composite such as glass fiber reinforced plastic.

The tube may for example consist of polyethylene. In particular, however, due to their good material properties meant fiber-plastic composites of at least one plastic and glass fibers, which are also known as GRP pipes. The plastics may be, for example, thermosetting plastics such as polyester resin or epoxy resin or thermoplastics such as polyamide. Also carbon fiber reinforced plastic is possible. In this way, a simple, cost-effective and proven standard industrial product can be used, which continues to be characterized by low weight and high strength or rigidity. In addition, the realization of special forms, such as inlet openings, coupling elements, manhole entry in the area of a manhole or domes for working positions in comparison to other materials easily and inexpensively possible. Also, the corrosion resistance of glass fiber reinforced plastics is higher, especially against biogenic hydrogen sulfide, so that the arrangement of additional protective layers is not necessary. Furthermore, the abrasion resistance is high. Long lifetimes are achieved. The manufacturing accuracy is also very high.

In particular, the fiber-plastic composite comprises at least one additive, such as quartz sand. It may be constructed as a multilayer material, wherein, for example, a core layer of aggregates and plastic or resin of two reinforced layers, consisting of glass fibers and resin is enclosed. The tube may be made by spin coating or winding.

In one embodiment, the wastewater purification device is designed as a membrane activation reactor.

A membrane revitalization reactor, also referred to in English as membrane bioreactor or membrane bioreactor, comprises an activation area, ie the aerated wastewater purification volume in which the activated sludge is disposed during normal operation, and a membrane for separating the water-solid mixture, ie for separation of purified wastewater from activated sludge flakes. The membrane is for example a microfiltration membrane or an ultrafiltration membrane. These can be dipped in separating basins or set up dry. In particular, the wastewater treatment system comprises at least one pump for backwashing the membrane.

In a membrane bioreactor, both the activation area, ie the wastewater purification volume, and the membrane are typically arranged in closed containers. This serves to protect the membrane, which can be damaged if foreign objects larger than 2 mm penetrate. The solution according to the invention has the advantage that both the wastewater purification volume and the membrane modules are completely enclosed by the tube and thus no additional covering device is necessary.

A membrane bioreactor reactor has the advantage that only a fraction, for example about 25% -35%, of the tank volume required for conventional biological stages is necessary for a comparable cleaning performance of the wastewater. Thus, despite the limited available space of the system arranged in the pipe, a high cleaning capacity can be achieved. A secondary clarifier is no longer necessary.

In one embodiment, the wastewater treatment system comprises a mixing and / or equalizing tank for mixing and / or balancing incoming wastewater with regard to at least one parameter of the wastewater such as the composition, the temperature, the pH, etc. This is in particular upstream of the wastewater treatment facility and / or or disposed within the tube. It may be fluidically connected to the inlet device, so that wastewater from it to the wastewater treatment device is conductive. The mixing and / or surge tank may typically be adapted to receive the incoming wastewater within several hours, for example> 4 hours, the incoming quantity being related to a design size of the wastewater treatment system. In particular, the mixing and / or expansion tank is arranged in the interior of at least one pipe or is provided by at least one pipe. This allows a simple subsequent expansion of the volume of this container, for example, to adapt it to increased precipitation in response to climate change.

In a further embodiment, the wastewater treatment system has an operating or inspection platform, which is arranged outside the pipe and connected to the pipe, and in particular can be walked on. In particular, the inspection platform extends substantially the entire length of the pipe so that all areas of the pipe can be reached by means of the platform and people ladders.

The inspection platform may comprise, for example, grid floor elements, which are suitably on the outside of the tube or on a stud and / or at least attached to a foundation for fixing the tube. It may also include a railing for fall protection.

In a further embodiment, the wastewater treatment system comprises a device for sand and / or grease separation, in particular a ventilated Langsandfang. It may also be an unvented sand trap or Langsandfang be provided in order not to affect the sedimentation. The device for sand and / or grease separation may be arranged at least substantially inside the tube.

In one embodiment, the wastewater treatment system comprises at least one metering device for metering flocculation, precipitation and / or flocculation aids for removing at least one dissolved and / or particulate substance, in particular comprising phosphorus, from the wastewater.

In a further embodiment, the wastewater treatment system comprises a pretreatment system with at least one pre-treatment device for the mechanical pretreatment of the wastewater in order to remove solids from the wastewater. The pre-treatment device is arranged upstream of the wastewater treatment device and fluidly connected to the feed device, so that pretreated wastewater can be passed to the wastewater treatment device. It may, for example, a coarse screen, for example with a mesh size> 10 mm, a fine rake, for example designed as a bar screen, rake and / or with a mesh size of 4-8 mm, and / or a fine screen, for example with a mesh size of 1 , 5-2 mm.

The pretreatment device may comprise a treatment device for the treatment, in particular for dewatering and / or compression of the removed solids, for example a screw press. In this way, the removed solids can be disposed of easily and efficiently.

The wastewater treatment system comprises in particular a

Sludge treatment device, such as a sludge press, for dewatering and / or compression of sludge, ie of solids from the activated sludge process. The sludge treatment device may comprise a polymer dosing device. The wastewater treatment system may be adapted to periodically remove the sludge from the wastewater purification volume and to supply the discharged sludge to the sludge treatment facility.

The pretreatment device and / or the sludge treatment device can be arranged in the pipe. It may also be located outside the submerged pipe on a separate platform or on adjacent land. In this way, the removal of the removed solids or the treated sludge by land by means of motor vehicles particularly simple, since they can approach directly to the respective device.

In a further embodiment, the system comprises a permeate tank arranged in particular within the tube for receiving the wastewater separated from the solids by means of the membrane, also referred to as permeate, which serves in particular as a reservoir for backflushing the membrane and / or for washing the removed solids.

A further embodiment of the wastewater treatment system is characterized in that the tube has at least one manhole for entering the interior of the pipe and / or for removing and / or inserting at least one module of the wastewater treatment system, for example for the purpose of replacement or maintenance of the module. In particular, the replacement of a membrane module may be meant.

A further embodiment of the wastewater treatment system is characterized in that the wastewater treatment device, in particular the pipe, has at least one manhole for entering the wastewater treatment device, for example the interior of the pipe, and / or for removing and / or inserting at least one module of the wastewater treatment system.

A manhole in the sense of the invention is an entry through which a person can get into the interior of the pipe from the environment of the pipe. In particular, it has a closure and suitable sealing elements for watertight sealing of the closure in the closed state of the manhole. In particular, the tube is accessible. It can have a suitable access through the manhole.

Furthermore, inspection flaps, etc. may be arranged in the pipe. The manhole can also be called a shaft entry. This embodiment leads to the advantage that necessary maintenance and inspection activities are particularly easy to implement.

In one embodiment, the wastewater treatment system comprises a control device, in particular an electronic control device, for controlling at least one parameter of the waste water flow, in particular for controlling a pump for backwashing a membrane of a membrane bioreactor.

In particular, the wastewater treatment system comprises at least one controllable device, such as a motor, a pump, a driven control element, etc., which is in operative connection with the control device for the purpose of controlling the parameter or can be brought.

By means of the control device, in particular the operation of the wastewater treatment system in a substantially automated manner control or adjustable. In particular, the control device is suitable for evaluating measured values and for generating control commands on the basis of the measured values. It can act as the central interface of the entire measuring, control and regulation technology of the wastewater treatment system.

In one embodiment, the wastewater treatment system comprises at least one measuring device for recording measured values relating to the flow rate, the temperature, the solids concentration, the pH, the concentration of at least one solute and / or at least one sum parameter such as COD, BOD ₅ , turbidity and / or a biological parameter such as E.coli of incoming, partially purified and / or fully purified effluent and / or with respect to membrane pressure, membrane flux, pump frequency, pump flow, compressor frequency, compressor flow and / or sampler in particular automated removal of aqueous or gaseous samples on at least one module of the wastewater treatment system.

In a further embodiment, the wastewater treatment system has a purification capacity between 50 m ³ / d and 1,000,000 m ³ / d, in particular between 300 m ³ / d and 2500 m ³ / d and for example between 800 m ³ / d and 1500 m ³ / d up.

For example, the cleaning capacity is between 150 m ³ / d and 100,000 m ³ / d, for example between 600 m ³ / d and 10,000 m ³ / d. In other words, the inlet device, the drainage device, the wastewater treatment device and possibly other devices for the intended cleaning of such a wastewater flow rate are designed. The wastewater treatment system therefore has in particular a capacity of more than 5000 population equivalents. This has the advantage that it can be used to treat wastewater from cities.

An embodiment of the wastewater treatment system is characterized in that the wastewater treatment system for the purification of wastewater with an inflow concentration of the chemical substance A, CSB, from 10-2000 mg / L, in particular from 100-750 mg / L, is established.

The wastewater treatment system may include a nitrification device for the bacterial oxidation of ammonia and ammonium to nitrate. It may have a denitrification facility for converting the nitrate nitrogen to molecular nitrogen. For example, a membrane bioreactor reactor may be adapted for nitrification and by means of an intermittently operable aeration device for denitrification.

In a further embodiment, the tube is composed of at least two pipe sections, wherein the pipe sections to waterproof and in particular reversible Manner are coupled together. The pipe sections are also pipes in particular. They typically have a length between 6 m and 40 m, for example between 10 m and 25 m, so that they can be transported by truck. Of course, longer pipe sections are not excluded, for example up to 50 m or 80 m, if suitable manufacturing, transport and / or laying methods are available.

The coupling of the pipe sections may comprise a form-fitting, cohesive and / or non-positive connection. For example, the pipe sections can be connected to one another by means of welded joints. They can also be connected or connectable to one another by means of mechanical couplings, wherein the connection can be reversible. For example, a coupling can be arranged or attached to one end of a respective pipe section and can be non-positively and / or positively connected to the correspondingly configured other end of the pipe section. The couplings can be designed annular and are placed for connection to appropriately configured pipe ends.

In this case, individual pipe sections can only serve to provide the wastewater treatment volume, so that the wastewater treatment volume is modular expandable. Different facilities can z. B. be arranged in different pipe sections. Thus, the capacity of the wastewater treatment system can be subsequently extended, so for example after production of the pipe or installation of the pipe at its destination and / or by reclassification of individual pieces of pipe.

The pipe sections can also be arranged side by side and / or one above the other. Thus, the arrangement can be flexibly adapted to the spatial conditions. In this case, in particular each piece of pipe has two end plates for sealing each of the volume covered by the pipe section. Between the pipe sections are suitable line elements or connecting elements for the realization of the waste water flow and possibly the compressed air volume flow and / or the volume flow of the purified wastewater.

In particular, the wastewater treatment device and / or other modules such as the ventilation device are each fixedly mounted in at least one piece of pipe, so that the wastewater treatment system by assembling and fixing the pipe sections to each other in a particularly simple and cost-effective manner can be mounted. After the preparation of the fluidic connection of an entry point at which wastewater is obtained, with the inlet device and the fluidic connection of a flow point at which purified wastewater is discharged, with the drain device and the possibly necessary connection of line elements, the operation of the wastewater treatment system can be quickly absorbed.

In other words, the wastewater treatment system is constructed separable. In this way, the transport of individual sections can be realized in a simple manner. Another advantage is that the wastewater treatment system can be increased almost indefinitely with little construction effort.

A second aspect of the invention is a process for wastewater treatment in which a wastewater treatment system according to the invention is provided and wastewater in the wastewater purification volume of the wastewater treatment facility is purified by means of aerobic microorganisms. In particular, a gas or gas mixture, for example air, flows out by means of the outflow element of the ventilation device for supplying oxygen to the microorganisms in the wastewater purification volume or the medium contained therein. In particular, the wastewater is fed by means of the feed device to the wastewater treatment device, namely the wastewater purification volume. In particular, purified wastewater is discharged by means of the drainage device from the wastewater treatment device.

A third aspect of the invention is a method for installing a wastewater treatment system, which comprises providing a wastewater treatment system according to the invention and arranging the tube in the at least partially submerged state. In particular, the method further comprises the fixation of the tube in said state, for example by means of suitable foundations. Furthermore, it may comprise the fluidic connection of an entry point, at which wastewater is obtained, with the inlet device. It may also include the fluidic connection of a drain point at which purified waste water is to be discharged, with the drain device.

A fourth aspect of the invention is the use of a pipe for arranging a wastewater purification volume of a wastewater treatment facility for the purpose of producing a wastewater treatment system according to the invention. Another aspect is the use of a pipe to provide a wastewater purification volume of a wastewater treatment system according to the invention.

A fifth aspect of the invention is a method for constructing a wastewater treatment plant, in which a wastewater treatment system according to the invention is provided and the pipes having wastewater purification volumes are laid in the ground, in particular in the grown soil. In particular, the tubes are fixed in position. They are connected to each other in such a way that the wastewater treatment volumes can be used as intended. The tubes can be at least partially and in particular completely covered, for example, with soil, wherein the soil may include in a previous step to prepare the substrate to receive the tubes excavated soil. Typically, the intermediate spaces between the pipes are completely filled with soil or liquid soil. Soil means in this context the living and / or inanimate upper layers of the earth's surface, which are also called earth or soil.

The number and / or length of the tubes or pipe sections can be selected according to the requirements. The connection with the other components of the wastewater treatment system and the combination of several wastewater treatment volumes is simple and efficient due to the standardized dimensions and connection areas. Due to the known statics of the pipes, the wastewater treatment plant can be realized without complex static design. The earthworks are due to the well-known and often proven way to lay pipes directly in the ground, minimized.

A sixth aspect of the invention is a method of reconstructing a wastewater treatment system, wherein a wastewater treatment system according to the invention is provided and wastewater purification volume is added or removed by connecting, removing or reconnecting pipes.

In other words, the usable volume for aerobic wastewater purification is changed in a simple manner. For example, to increase the wastewater treatment capacity or the total existing

Wastewater treatment volume of the wastewater treatment system at least one additional pipe are arranged and possibly connected to a distributor and / or a collector.

To reduce the wastewater treatment capacity pipe sections, pipe sections and / or pipes can be removed or closed plates by arranging appropriate separation.

It is also possible, by arranging, removing and / or moving separation plates between individual pipe sections to change the volume ratios of the pipe sections and redesign existing volume in this way, to adapt it, for example, to changing procedural requirements. For example, a ventilated volume can be increased in a simple and cost-effective manner, and an unvented volume or anoxic volume can be reduced by the same amount.

In an analogous manner, volumes of other components of the wastewater treatment system, such as volumes usable for sedimentation, volumes usable to separate solids, etc., may be added or removed. For example, several pipes or pipe sections can be fluidly connected by adapter pieces. In this way can be done in a simple way modular extensions. In addition, particularly simple large volumes for wastewater treatment can be provided.

The invention will be explained below with reference to the embodiment shown in the accompanying drawings.

Show it

1 is a partially sectioned plan view of a sewage treatment system according to the invention with partially submerged in a water pipe,

Fig. 2: a partially sectioned side view of the wastewater treatment system of Figure 1, as well

3 shows a partially cutaway front view of the waste water purification system from FIGS. 1 and 2,

4 is a perspective view of an alternative embodiment of a wastewater treatment system according to the invention,

5 shows a perspective view of the wastewater purification volumes of the wastewater treatment system from FIG. 4, FIG.

6 is a perspective view of the devices of the level -1 of

Wastewater treatment system of Figures 4-5, and

Fig. 7: a perspective view of the devices of the level -2 of

Wastewater treatment system of Figures 4-6.

FIG. 1 shows a pipe 30 in which a wastewater treatment device 12 is arranged. The tube 30 has a length of about 54 m and a diameter of about 4 m. The wastewater treatment system 10 and the wastewater treatment device 12 have a

Cleaning capacity of 1200 m ³ / d. The wastewater treatment device 12 comprises a

Wastewater treatment volume 14 for cleaning the incoming by means of the feed device 20 wastewater by means of aerobic microorganisms. For this purpose, in the wastewater purification volume 14, which is delimited along the radial direction by the inner wall of the tube 30, outflow elements 42 are arranged for outflow by means of compressors 46 of compressed ambient air. These are part of the ventilation device 40, which in addition to the compressors 46, the compressed air lines 44 includes. There are on the one hand compressed air lines 44 for supplying the compressed air to the discharge elements 42, which are designed as Plattenbelüfter and fixed to the inner pipe wall, arranged. On the other hand, compressed air lines 44 are for feeding the compressed air to the membrane modules 16 arranged. These serve in addition to the backwashing of the membrane modules 16 by means of purified wastewater cleaning the membranes.

The wastewater to be purified is mechanically pretreated by means of a pretreatment system 77 arranged on a separate second platform 52. The pretreatment system 77 comprises a sieve 72, a fine sieve 74 and a computer 71. In the pretreatment system 77, all particles> 2 mm are mechanically removed in several stages. Furthermore, the screw press 70 is arranged on the second platform 52 for dewatering the withdrawn activated sludge. As an alternative to the illustration shown here, it is possible to arrange the pretreatment system 77 inside the tube 30 or at least one further tube. All devices required directly or indirectly for wastewater treatment, including the feed device 20 and the drain device 22, can be arranged in the tube 30 or in tubes 30.

The pretreated wastewater passes by means of a pipeline into the mixing and equalizing tank 62 located in the pipe 30 and from there by means of a raw water pump 63 via the feed device 20, likewise a pipeline, into the wastewater purification volume 14, ie the activated sludge tank. This is a section of the tube 30, which is separated by means of two T rennplatten 39 arranged perpendicular to the longitudinal direction of the tube 30 T.

Along the axial direction on both sides of the wastewater purification volume 14, separated by means of the mentioned separating plates 39, respective separating basins 17 are arranged, in which submerged membrane modules 16 are arranged. These serve to separate the activated sludge flakes from the water-sludge mixture. For this purpose, this flows from the wastewater purification volume 14 into the separating basins 17. The permeate, ie the clear water, leaves the membrane modules 16 by means of the drainage devices 22, which are likewise designed as pipelines. It is conveyed to the permeate pumps 64, which generate the necessary for the membrane filtration negative pressure and ensure the function of the membrane modules 16 in this way. Subsequently, the permeate is passed into the permeate tank 66, which serves as a reservoir for the process water required for the backwashing of the membranes. The permeate tank 66 is also a portion of the tube 30 bounded by two partition plates 39 along both axial directions. In other words, the wastewater purifier 12 is configured as a membrane bioreactor reactor.

The wastewater treatment system 10 comprises two face plates 38 connected watertight to the pipe 30 for sealing the wastewater treatment device 12 from the environment. These are at each boundary 34 of the longitudinal extension 32 of the tube 30, that is at both ends of the tube 30, is arranged. Thus, penetration of water of the water 82 as well as leakage of sewage into the environment is prevented. The wastewater treatment system 10 can thus be operated in an at least partially submerged state of the pipe 30. The end plates 38 are arranged so that they seal the entire volume enclosed by the tube 30 from the environment.

It can be seen that the tube 30 with the wastewater treatment device therein is arranged in a body of water 82. The fasteners, the framework and the foundations for fixing the tube 30 are not shown in Fig. 1. Adjacent to the tube 30, the described second platform 52 is arranged, which is at least partially on the shore 80 of the water 82, so on land, set up. This is connected to the pipe 30 at least by means of the described pipes and the sludge line 69 for the realization of a discontinuous sludge discharge from the wastewater purification volume 14 to the screw press 70.

The pumps 60 are used for mixing the wastewater-sludge mixture in the wastewater purification volume 14 and / or in the separation basin 17th

FIG. 2 shows a partially sectioned side view of the described wastewater treatment system 10. In addition to the devices and modules described in connection with FIG. 1, the details for setting up the pipe 30 are shown here in particular.

The tube 30 is frame-like surrounded by a stator 87, which extends in the lower part to the (not shown) water body. For attachment or anchoring of the framework 87 is to be placed below a suitable foundation, which is also not shown here. Of course, it is also possible to anchor only piles, such as steel pipes, in the ground and in this way to fix the wastewater treatment system or the pipe 30 and to secure against up and down. The piles can be part of the framework 87. Lying on the framework 87, the operating or inspection platform 50 is arranged, which is connected to the pipe 30, for example by means of the stud frame. This is accessible and extends over the entire longitudinal extent 32 of the tube 30. It serves the accessibility of all arranged in or on the tube modules or facilities of the wastewater treatment system 10, in particular for maintenance and servicing activities. The framework 87 and the operation or inspection platform 50 project beyond the pipe by more than one meter.

Furthermore, the outside water level 83 is shown, which makes it clear that the tube 30 is partially submerged in water. In addition, the water level is 15 in Wastewater purification volume 14 shown, which corresponds to a filling level of the wastewater purification volume 14 of about 90% of the inner diameter of the tube 30. In the separation tank 17 is essentially the same water level. Of course, the water level 15 may vary depending on the operation and, for example, be significantly higher than shown. Typically, the water level 15 is higher than the outside water level 83.

FIG. 3 shows a partially cutaway front view of the wastewater treatment system 10, that is to say viewed along the axial direction of the tube 30. Here, the installation of the tube 30 with the framework 87 and the second platform 52 becomes clear. As described, the second platform 52 is connected to the shore 82, so that the disposal or the removal of the thickened or dewatered sludge and the washed and compacted screen or Siebguts is easily feasible. It can be seen that the stated solids are stored in mobile roll containers.

By contrast, the tube 30 together with the framework 87 is arranged in the water 82 so that the tube 30 with the wastewater treatment device 12 located therein is partially submerged below the outside water level 83 of the water body 82. Also shown are the inlet device 20, so the pipe for supplying the wastewater, and the sludge line 69 for discharging the withdrawn sludge for drainage. These connect the wastewater treatment device 12 with the second platform 52 and represent the flow connections to the environment.

FIG. 4 shows a sewage treatment system 10 in the form of a sewage treatment plant to be arranged substantially underground, of which only four service buildings 95 are arranged above ground. Core of the wastewater treatment system 10 are 162 parallel operated tubes 30 made of glass fiber reinforced plastic, GRP, with a diameter of 4000 mm and a length of about 100 m, which are provided with respective discharge elements (not shown) and in this way respective wastewater treatment volumes 14th provide for aerobic wastewater treatment. The tubes 30 are made of pipe pieces of 6 m in length, which are fluidly connected by means of respective couplings. They are laid in the natural soil and the spaces are filled with soil, so that the installation of the wastewater treatment system 10 according to the invention can be carried out particularly simple and inexpensive.

The effluent treatment system 10 shown here is sized for approximately 8 million inhabitants and has a purification capacity of approximately 800,000 m ³ / d at a peak inflow of up to 56,000 m ³ / h. It should be noted that in FIGS. 4 to 7, a majority of the devices are present in multiple designs and, for reasons of clarity, not all devices in the figures are designated individually by reference symbols.

The wastewater treatment system 10 comprises distributors 90 in fluid communication with the tubes 30 for distributing the wastewater to be treated to the wastewater purification volumes 14. These are aligned at right angles to the tubes 30 and are at the same height level as these. The sewage treatment system 10 further includes collecting means 92, in fluid communication with the tubes 30, for collecting the at least partially purified waste water from the tubes 30. These are also aligned at right angles to the tubes 30 and are at the same height level as these. The distributors 90 and the collectors 92 are each configured as GRP pipes with a diameter of 4000 mm and a length of about 200 m.

FIG. 5 shows the tubes 30, distributors 90 and collecting devices 92. In addition to the wastewater purification volumes 14 likewise arranged in the tubes 30, the schematically illustrated separating plates 39 are separated from the wastewater purification volumes 14 by anoxic volumes 18 which act as denitrification devices. It can be seen that by suitable arrangement or change of the arrangement of the partition plates 39, optionally with the use of suitable flow control devices such. As flaps, the shares of wastewater treatment volumes 14 and the anoxic volumes 18 can be changed in the entire volume provided by the tubes in a simple manner.

The sewage treatment system has 32 manholes 99 for entering the interior of the sewage treatment system, which are designed as watertight doors in the collectors 92. Through these manholes 99 all pipes 30 are accessible through the corresponding fluidic connections.

The tubes 30 are divided into four similar and spatially separated subsystems, which are each divided into two halves. Between these halves is in each case a service pipe 97, which does not provide wastewater purification volume but is permanently accessible to the personnel for inspection purposes and / or can accommodate piping, measuring instruments, fittings and the like.

FIG. 6 shows parts of the described wastewater treatment system at an underground level -1. In addition to the parts already described, 24 computer systems 71 are shown, which are each designed as revolving screening systems and are likewise arranged in GRP pipes with a diameter of 4000 mm. The three consecutively arranged computer systems 71 have mesh sizes of 20 mm, 2 mm and 0.5 mm. The small mesh sizes of the respective last computer systems 71 are necessary in order not to damage downstream membrane systems for solids separation. The wastewater to be purified is supplied to the computer systems 71 via at least one feed device, which is in fluid communication with the pipes of the computer systems 71.

The waste water is pumped from the computer 71 to the sand and fat separators 106, which are designed as long sand catches with a length of 60 m and are also provided by GRP pipes with a diameter of 4000 mm. Associated screenings and sand washing facilities 108 serve to treat the deposited material of the computing equipment 71 and separators 106. The cleaned material is collected in containers and provided for automated batch picking.

The mechanically pretreated wastewater is supplied via the distributor 90 to the wastewater purification volumes 14 in the interior of the tubes 30. The partially purified waste water collected in the collectors 92 is fed to vented membrane modules 16 where the solids are separated. The pressure difference required for this purpose is provided by means of the pumps 60. In other words, the wastewater purification device is configured as a membrane activation reactor.

For further treatment of the sludge separated in the membrane modules 16, sludge dewatering devices 104 and sludge containers 68 connected thereto are shown. The research containers 68 are measured for a residence time of about 20 days and in turn are associated with sludge dewatering facilities for further drainage of the sludge.

The purified wastewater freed from the solids is optionally temporarily stored in permeate tanks and / or storage tubes 102 or fed to a drainage structure (not shown). Also shown in FIG. 7 are the compressors 46 for providing compressed air for the discharge elements in the interior of the wastewater purification volumes 14 in the interior of the tubes 30 and for the membrane modules 16. In addition, storage tubes 102 are shown which provide buffer volumes for inlet tips.

The removal of separated solids takes place by means of automated vehicles, which transport the respective solids to elevators located in the elevator shafts 100, so that they can be conveyed to the service buildings 95 located above ground.

All parts of the wastewater treatment system shown at least partially outside the pipe 30 or pipes 30 in the figures can be arranged in the pipe 30 or in the pipes 30. This significantly facilitates the transport and installation of the wastewater treatment system. LIST OF REFERENCE NUMBERS

Wastewater treatment system 10

Wastewater treatment facility 12 Wastewater treatment volume 14

Water level 15

Membrane module 16

Separating basin 17

Anoxic volume 18 inlet device 20

Expiration device 22

Tube 30

Longitudinal extension 32

Limit 34 face plate 38

Partition plate 39

Ventilation device 40

Outflow element 42

Compressed Air Line 44 Compressor 46

Operating or Inspection Platform 50

Second platform 52

Pump 60

Mixing and equalizing tank 62 Raw water pump 63

Permeate pump 64

Permeate tank 66

Digestate bin 68

Sludge line 69 Screw press 70

Computer system 71

Sieve 72

Fine Screen 74 Pretreatment System 77

Shore 80

Waters 82

Outside water level 83

Stand 87 distributor 90

Collection device 92

Service building 95

Service tube 97

Manhole 99 Elevator shaft 100

Storage tube 102

Sludge dewatering device 104

Separator 106

Screenings and sand washer 108

Claims

claims

A wastewater treatment system (10) comprising

- An inlet device (20) for supplying waste water to a wastewater treatment device (12),

- the wastewater treatment device (12) with a wastewater purification volume (14) for the purification of the wastewater by means of aerobic microorganisms,

- A drain device (22) for discharging purified wastewater from the wastewater treatment device (12), and

a tube (30),

wherein the wastewater purification device (12) has a ventilation device (40) for supplying oxygen to the microorganisms with at least one outflow element (42) arranged in the wastewater purification volume (14) for the outflow of a gas or gas mixture,

characterized in that the wastewater purification volume (14) is arranged inside the tube (30),

wherein the wastewater treatment system (10) comprises a plurality of tubes (30) in each of which a wastewater purification volume (12) is arranged.

2. Wastewater treatment system (10) according to claim 1, characterized in that the wastewater treatment system (10) has at least two watertight with the pipe (30) connected end plates (38) for sealing at least the wastewater treatment device (12) from the environment, so that the wastewater treatment system ( 10) can be operated in an at least partially submerged state of the pipe (30),

wherein the end plates (38) are arranged in particular such that they seal substantially the entire volume enclosed by the tube (30) from the environment.

3. wastewater treatment system (10) according to any one of the preceding claims, characterized in that the tube (30) is made substantially of plastic, in particular of a fiber-plastic composite such as glass fiber reinforced plastic.

4. wastewater treatment system (10) according to any one of the preceding claims, characterized in that the wastewater treatment device (12) is designed as a membrane activation reactor.

5. wastewater treatment system (10) according to any one of the preceding claims, characterized in that the wastewater treatment system (10) one outside the tube

(30) arranged, connected to the pipe (30) and in particular walkable operating or inspection platform (50), wherein the operation or inspection platform (50) in particular substantially over the entire longitudinal extension (32) of the tube (30 ). 6. wastewater treatment system (10) according to any one of the preceding claims, characterized in that the wastewater treatment system (10), in particular the tube (30), at least one manhole (99) for entering an interior of the

Wastewater treatment system, for example, the interior of the pipe (30), and / or for removing and / or inserting at least one module of the wastewater treatment system (10), for example, for the purpose of replacement or maintenance of the module has.

7. Wastewater treatment system (10) according to any one of the preceding claims, characterized in that the wastewater treatment system (10) has a control device, in particular an electronic control device, for controlling at least one parameter of the waste water supply, in particular for controlling a pump for backwashing a Membrane of a membrane bioreactor.

8. wastewater treatment system (10) according to any one of the preceding claims, characterized in that the wastewater treatment system (10) has a cleaning capacity between 50 m ³ / d and 1,000,000 m ³ / d, in particular between 300 m ³ / d and 2500 m ³ / d and, for example, between 900 m ³ / d and 1500 m ³ / d. 9. wastewater treatment system (10) according to any one of the preceding claims, characterized in that the tube (30) is composed of at least two pipe sections, wherein the pipe sections are coupled together in a watertight and in particular reversible manner.

10. A method for wastewater treatment in which a waste water purification system (10) according to any one of claims 1-9 is provided and wastewater in the wastewater purification volume (14) of the wastewater treatment facility (12) is cleaned by means of aerobic microorganisms,

wherein in particular a gas or gas mixture, for example air, flows out by means of the Ausströmelements (42) of the aeration device (40) for oxygen supply of microorganisms in the wastewater purification volume (14).