DE202019005624U1 - System for the treatment of residual concrete water - Google Patents

Abstract

System for the treatment (10) of residual concrete water (12), which occurs as waste water (14) in the fresh concrete production and contains fresh return or residual concrete, comprising a collecting device (16) for collecting the residual concrete water (12) and a cleaning device (28) for Cleaning of the residual concrete water (12), which cleaning device (28) is designed to clean the residual concrete water (12) by separating off solids, which cleaning device (28) is a solidifying device (32) for forming solid bodies (34) from the separated solids (30) wherein the system (10) comprises a comminution device (36) for comminuting the solid bodies (34) into solid grains (38), characterized in that the comminution device (36) is arranged or formed directly downstream of the solidification device (32) without the interposition of a conveyor device is.

Description

The present invention relates to a system for processing residual concrete water, which occurs as waste water in fresh concrete production and contains fresh back or residual concrete, comprising a collecting device for collecting the residual concrete water and a cleaning device for cleaning the residual concrete water, which cleaning device is designed to clean the residual concrete water through Separation of solids, which cleaning device comprises a solidification device for forming solid bodies from the separated solids, the system comprising a comminution device for comminuting the solid bodies into solid grains.

Furthermore, a method for treating residual concrete water is described, which occurs as waste water in fresh concrete production and contains fresh back or residual concrete, in which method residual concrete water is collected and cleaned, when cleaning the residual concrete water contained in this sedimentable solids are separated or removed and from the separated or removed sedimentable solids solid bodies are formed, wherein the solid bodies are comminuted to solid grains.

When fresh concrete is produced in a concrete plant, a not inconsiderable amount of so-called fresh back or residual concrete is produced every day. This is concrete that has not or never set and is therefore still in a viscous form.

It is known to clean fresh, not yet set concrete, which is rinsed out with water when cleaning a concrete mixing plant or a truck mixer, in a concrete recycling plant. In such systems, the adhering cement and the fine sand grains are separated from the coarse rock and sand by washing out by adding water in countercurrent. Coarse components of the original fresh concrete such as pebbles and the like can be used for the renewed concrete production.

However, all fine particles or fine particles, which in particular have a diameter of less than 0.2 mm, are rinsed out with the water and collected. Since this water is increasingly enriched with fine particles and particles with every rinsing or cleaning process, the water density increases. Therefore, this so-called residual concrete water cannot be used indefinitely to flush the washed-out fresh concrete. Operators of such recycling systems are therefore forced to supply this cleaning cycle with fresh water every day. As a result, the amount of residual concrete water is constantly increasing.

The residual concrete water can only be used for concrete production within narrow limits, depending on its density. In addition, large amounts of residual concrete water are left over, which can no longer be used. Since it is forbidden to feed the residual concrete water into the sewer system, only a complex and expensive disposal of this residual concrete water by specialist companies is possible. This can cost several hundred euros per ton of sedimented solids.

From the U.S. 5,554,297 methods and systems of the type described above are known in which solid bodies in the form of filter cakes are formed from the residual concrete water. These are conveyed from the solidification device by means of a transport step using an active mechanical conveying device to the comminution device, where they are comminuted into solid grains. The conveyance of the filter cakes is therefore very expensive, in particular, because the filter cakes must be prevented from sticking or sticking to the conveying device with an additional powdering device. With this, the conveyor device is sprinkled with dry, non-adhering powder made of concrete granulate before the filter cakes are picked up. The filter cakes then fall onto the powder which is discharged on the conveying device and which protects the conveying device so that the filter cakes cannot adhere to the conveying device.

In a method of the type described at the outset, it is proposed that the solid bodies formed be comminuted directly after their formation without the interposition of a transport step.

The proposed further development makes it possible in particular to continue to use the sedimentable solids that were previously to be disposed of as hazardous waste, in particular for concrete production. For this purpose, as proposed, the solid bodies which are formed from the sedimentable solid are comminuted in order to form solid grains which can be used as larger components in the production of concrete, in particular fresh concrete. For example, the solid bodies can be formed in solid grains the size of pebbles in order to replace part of the gravel required for the production of concrete. In particular, plate-shaped solid bodies which are formed from the separated or removed sedimentable solids can be comminuted in the desired manner. The disposal of such Solid body panels are then no longer required. In principle, the solid grains can have any shape. Irregularly shaped, fissured solid grains are just as possible as spherical, egg-shaped or cuboid or essentially spherical, egg-shaped or cuboid solid grains. Furthermore, it is optionally also possible to carry out the method without the steps of collecting and cleaning. The usability of the sedimentable solids results in particular from the comminution of the solids into solid grains of the desired size. Dispensing with the interposition of a transport step between the formation of the solid bodies and the comminution of the same has the particular advantage that no expensive conveying device has to be provided for this. Furthermore, it is not necessary that the U.S. 5,554,297 to solve complex problems of sticking or caking of the solid bodies formed, that is to say in particular the solid cake, to the conveying device. In other words, the proposed further developed method for treating residual concrete water is possible without an active conveyance or without an active conveyance step of the solid bodies from the step of forming the solid bodies to the step of comminuting the solid bodies into solid grains. This makes the process particularly simple. Furthermore, an installation or a system with which the method is carried out can be designed to be particularly compact. For example, a conventional transport container is sufficient for such a system. Such a system can, in particular, be used in a mobile manner for the treatment of residual concrete water in the manner described.

It is favorable if the formation of the solid bodies, based on the direction of gravity, is carried out directly above or above the comminution of the solid bodies into solid grains. Such a further development of the method for processing residual concrete water makes it possible in particular to use the force of gravity acting on the solid bodies formed in order to pass them passively to the comminution step, in particular directly or via an insertion aid, such as a filling funnel. No active funding system is required for this. The movement of the solid bodies, for example in the form of filter cakes, from their formation to the comminution takes place exclusively by gravity, therefore by the weight of the respective solid bodies. Filter cakes that have formed can thus be comminuted directly after they have been formed, without the need for a transport device.

It is advantageous if the solid grains are produced or formed with an average grain size in a range from approximately 4 mm to approximately 50 mm by comminution. In particular, they can be produced with a mean grain size in a range from approximately 6 mm to approximately 25 mm by comminution or formed by appropriate shaping. Such solid grains can in particular be used as a gravel substitute for the production of hardened concrete.

The mean grain size is preferably specified. In this way, substitutes for concrete production can be specifically formed from the sedimentable solids.

The solid bodies can be comminuted in a simple manner if they are comminuted mechanically. In particular, this can be done by the action of at least one comminuting element for comminuting the solid bodies into solid grains. For example, the at least one comminuting element can be designed in the form of a crusher roller or a press ram. Furthermore, any number of comminuting elements can be provided.

It is favorable if the solid bodies are comminuted in a comminution chamber in which the at least one comminution element is arranged or formed. This makes it possible in particular to carry out the comminution in a defined space, namely in a comminution space defined by the comminution chamber. In particular, a compact system for treating residual concrete water can be created.

It is advantageous if the at least one comminution element is moved to comminute the solid body. In particular, it can be moved or rotated. If several comminution elements are provided, these can in particular be moved in opposite directions or rotated in opposite directions in order to comminute the solid bodies into solid grains.

The solid bodies are preferably introduced into the comminution chamber through at least one filling opening. In particular, the filling opening can be closed during the comminution, so that it must first be opened before the solid bodies are introduced.

According to a further preferred embodiment it can be provided that the solid bodies are introduced into the comminution chamber exclusively by the acting gravity through a filling opening that is open opposite or essentially opposite to the direction of gravity. This procedure makes it possible in particular to completely dispense with any transport device in order to move the solid bodies from the location where they are trained to bring to the place where they are comminuted, namely in the comminution chamber.

In order to make the introduction of the solids into the shredding chamber particularly simple, it is advantageous if the solids have a hopper which has a hopper inlet and a hopper outlet, the hopper inlet defining a larger free cross-sectional area than the hopper outlet, through the hopper opening into the shredding chamber become. In particular, a guide or sliding surface defined by the filling funnel can be used to introduce solid bodies that are transferred directly above the filling opening into the crushing chamber by the force of gravity acting on them by means of the filling funnel without the aid of active conveying devices or conveying elements through the filling opening.

According to a further preferred embodiment it can be provided that the solid bodies are comminuted in the comminution chamber, which comminution chamber defines a comminution chamber and comprises at least one comminution chamber wall, the at least one comminution chamber wall defining an inner wall surface delimiting the comminution chamber and the inner wall surface being provided with a solid body anti-adhesive coating is. Crushing the large solid bodies produced in such a crushing chamber has the particular advantage that neither the solid bodies nor the solid grains formed from them by crushing can adhere to the at least one crushing chamber wall. The comminution of the solids can be done easily and safely. Furthermore, the amount of energy required for this can also be minimized.

The solid bodies are preferably comminuted with at least one comminuting element which is provided with a solid body non-stick coating. Crushing the solid bodies with one or more such comminuting elements has the particular advantage that neither the solid bodies nor the solid grains formed from them can adhere to the at least one comminuting element. This allows the process to be carried out reliably. In particular, continuous comminution of solid bodies is possible.

It is favorable if the solid bodies are introduced into the comminution chamber through the filling funnel, which defines at least one inner filling funnel surface and which inner filling funnel surface is provided with a solid body anti-adhesive coating. If such a filling funnel is used, the risk that solid bodies can stick or stick to an inner filling funnel surface when using such a filling funnel is minimal. Solid bodies can therefore be easily and safely introduced into the comminution chamber.

In order to keep the sedimentable solids as evenly distributed as possible in the residual concrete water, it is advantageous if the residual concrete water collected is kept in motion. In particular, this can be done by stirring.

It is favorable if the separation of sedimentable solids from the residual concrete water is carried out in at least one separation step or in at least one separation stage. In order to further reduce the density of the residual concrete water in particular, it is advantageous if two, three or more such separation steps or separation stages are provided.

Preferably, sedimentable solids in the form of fine and / or suspended particles are separated or removed from the residual concrete water. These preferably have a mean diameter of a maximum of 0.5 mm, in particular a maximum of 0.2 mm.

It is advantageous if sedimentable solids are separated or removed from the residual concrete water by inclined and / or lamellar clarifiers and / or hydrocyclones. With such devices, the sedimentable solids can be separated or removed from the residual concrete water in a simple manner.

It is favorable if the separated or removed sedimentable solids are pressed or pressed in order to form solid bodies or solid grains. For example, the sedimentable solids can be pressed into solid bodies in the form of plates. In particular, this can be done by means of a filter press. With the filter press, the solids can be separated on the one hand and compressed and dehydrated to a certain extent on the other. Residual moisture in the solid bodies can thus be in a range from approximately 45% to approximately 50%. The solid bodies can optionally be stored for further processing. Furthermore, solid grains can also be formed directly by pressing, for example by pressing through appropriate matrices or by filling and pressing in appropriate molds. In this way, solid grains can be easily formed in the desired size and shape.

The sedimentable solids which have been separated off are advantageously dried. In this way, they can be further processed with as little water as possible or even almost without water.

It is favorable if the solid bodies are dried before comminution or if the solid grains are dried. The solid bodies are harder when they are dried before being comminuted, but are less likely to bake together, which can happen in particular if they still have a certain amount of residual moisture.

In order to improve the formation of solid bodies and solid grains, it is advantageous if the separated sedimentable solids are thickened before solid bodies are formed.

In order to be able to continue using the purified residual concrete water, in particular as purified fresh water, hereinafter also referred to as residual water, and optionally also to be able to feed it directly into the sewer system, it is advantageous if the purified residual concrete water is filtered.

In order to be able to develop a closed process cycle in particular, it is advantageous if the cleaned residual concrete water is collected and / or stored as residual water. In particular, it can be stored in a residual water collection container. This can in particular be a basin or a tank.

In particular, it can be advantageous if a density of the residual water is measured. In particular, it can be ensured that the collected and stored residual water does not exceed a certain water density, which would not be permissible for the production of fresh concrete.

In order to have to use as little fresh water as possible in the process for treating residual concrete water, it is advantageous if the residual water is added to the residual concrete water before and / or during cleaning. Fresh water can be saved by using the purified residual water from the concrete, i.e. the residual water. The residual water can be added to the process in practically every step to which fresh water would also be added.

The pH of the residual water is preferably measured. This makes it possible to determine whether the residual water has a high or basic or essentially neutral pH value.

It is also advantageous if the residual water is neutralized or essentially neutralized as a function of the measured pH value. In particular, this can follow by adding a base. For example, if a pH value of the residual water is very acidic, pH values of the order of magnitude of about 2 are not uncommon, the residual water can be neutralized by adding a base or lye, i.e. its pH value can be reduced to one value in one Range from about 6 to 8, preferably to a value of about 7, can be set.

It is also advantageous if the density of the residual concrete water is measured before cleaning and / or during cleaning. In particular, this measurement can be carried out continuously or discontinuously. An actual water density value measured in this way can then be used to specifically supply fresh water or residual water to the residual concrete water, for example.

According to a further preferred variant of the method it can be provided that a water density target value for the residual concrete water is specified and that the residual concrete water is cleaned until a measured actual water density value of the purified residual concrete water corresponds to the water density target value or is less than the water density target value is. With this procedure, it can be achieved in particular that an actual water density value of the residual concrete water does not or does not significantly exceed a desired water density value.

It is also advantageous if at least one binder is added to the separated sedimentable solids before solid bodies or solid grains are formed. Two, three or even more different binders can also be added. The at least one binder makes it possible in particular to form solid bodies or solid grains with higher strength. In this way, in particular, the dimensional stability of the solid bodies and solid grains can be improved.

It is favorable if at least one binder is added to the uncleaned residual concrete water and / or if at least one binder is added to the residual concrete water during cleaning. The at least one binding agent, as described, can also be different or more binding agents, can be added to the residual water of the concrete before solid bodies or solid grains are formed. In this way, particularly good mixing of the sedimentable solids with binding agent can be achieved.

It is also advantageous if at least one binder is added to the solid grains. In particular, smaller solid grains can be bound together to form larger solid grains.

Cement is preferably added as at least one binding agent. In particular, fresh cement can be added. This makes it possible in particular to use the solid grains again for concrete production.

Furthermore, it can be advantageous if at least one filler and / or at least one insulating material is added to the solid grains before and / or after they are formed. In particular, insulating materials or raw materials for the brick industry or the building materials industry can be developed. From the originally no longer usable waste material, which represented the sedimentable solids, high-quality raw or starting materials can now be formed.

It is favorable if the solid bodies are designed in the form of plates. In particular, the cleaned and separated sedimentable solids can be easily filled into molds and, in particular, pressed. Panels also have the advantage that they can be handled and stored in a simple manner, in particular in a compact manner.

Furthermore, the use of solid grains produced by one of the methods described above is proposed as an aggregate for producing concrete, in particular fresh concrete, or for producing road surfaces. In particular, it is possible for the sedimentable solids that are separated or removed from the residual concrete water to be completely or essentially completely used for further useful purposes. In this way, costly disposal as hazardous waste can be effectively avoided. In particular, the use of solid grains, which are formed by comminuting solid bodies or by corresponding shape-forming production, is also proposed as an aggregate for producing concrete, in particular fresh concrete, or for producing road surfaces.

The object set at the beginning is achieved according to the invention in a system of the type described at the beginning in that the comminution device is arranged or formed directly downstream of the solidification device without the interposition of a conveyor device.

Such a further developed system makes it possible, in particular, to comminute the solid bodies formed and to continue to use the solid grains formed in this way. Alternatively, solid grains can also be formed directly with the solidification device. In this way, the breaking up of the solid bodies into solid grains can be avoided. In particular, the system can also only comprise the solidification device for forming solid grains from the sedimentable solids or the comminution device for comminuting solid bodies from sedimentable solids. Furthermore, such a system for treating residual concrete water makes it possible to transfer the solid bodies from the solidifying device to the comminuting device without any conveying effort. The system can be made particularly compact in this way. A complex transport mechanism, like the one from the U.S. 5,554,297 known system is the case is completely superfluous. For example, only the force of gravity acting on the solid body can be used to transfer the solid body from the solidification device to the comminution device, so that an active conveying device, as is known from the prior art, is completely superfluous.

Advantageously, the solidifying device is arranged or formed directly above or above the comminuting device in relation to the direction of gravity. This configuration of the system makes it possible, in particular, to implement a particularly compact structure, since an active conveying device can be completely dispensed with. To transfer the solid bodies from the solidification device to the comminution device, only gravity, hence the weight of the solid body, can be used.

It is favorable if the solidification device and / or comminution device are designed to produce solid grains with an average grain size in the range from approximately 4 mm to approximately 50 mm. In particular, the grain size can also be in the range from approximately 6 mm to approximately 25 mm. The further use of the solid grains can depend in particular on their mean grain size.

The system preferably comprises an input device for specifying the mean grain size of the solid grains. In particular, the input device can be designed to interact with the solidification device and / or the comminution device, so that solid grains with the desired mean core size can be formed by comminution and / or directly by shaping.

The solid bodies can be comminuted in a simple manner if the comminution device is designed in the form of a mechanical comminution device. In particular, this can comprise at least one crusher roller and / or at least one press ram. Of course, two, three or more breaker rollers and / or press rams can also be provided.

It is favorable if the mechanical comminution device comprises at least one comminution element for comminuting the solid bodies into solid grains. In particular, two or more comminuting elements can be provided. Depending on the configuration of the at least one comminuting element, solid grains in a desired size range, that is to say with a desired grain size, can be formed from the solid bodies by comminuting.

The comminution device preferably comprises two, three, four, five, six or more comminution elements. The plurality of comminution elements can in particular be arranged and designed to interact with one another in order to comminute the solid bodies between them to form solid grains. For example, they can be arranged or designed to be movable relative to one another for this purpose.

The system can be designed in a particularly simple and compact manner if the at least one comminution element is designed in the form of a worm shaft. Such a screw shaft can, similar to a screw conveyor, be designed with a spiral conveyor wall arranged on a rotating shaft. The conveying wall can have a plurality of perforations. An edge of the spiral conveyor wall pointing away from the rotating shaft can in particular be structured in order to comminute the solid bodies in a defined manner into solid grains.

The comminution of the solid bodies can be achieved in a simple and safe manner, in particular, in that the worm shaft is designed in a spiral shape and is provided with a plurality of comminution members on its outer circumference.

It is favorable if the plurality of comminuting members is designed in the form of saw teeth pointing in the radial direction away from a longitudinal axis defined by the worm shaft. For example, a grain size of the solid grains can be specified by the shape and size of the saw teeth.

It is favorable if the comminution device comprises a comminution chamber and if the at least one comminution element is arranged or formed in the comminution chamber. This configuration enables, in particular, a compact design of the system. Furthermore, the comminution of the solid bodies can take place in a defined space, namely in a comminution space defined by the comminution chamber.

The at least one comminuting element is advantageously arranged or designed to be movable. In particular, it can be arranged or designed to be rotatable, displaceable or reciprocable. In this way, solid bodies can be easily and safely comminuted into solid grains.

For automatic operation of the system, it is particularly advantageous if the comminution device comprises a drive device for driving the at least one comminution element. The at least one comminution element can be moved in the desired manner with the drive device. For example, two or more comminution elements can be provided, which can be rotated with the drive device towards one another and away from one another again or in particular in opposite directions relative to one another.

It is advantageous if the comminution device has at least one filling opening for introducing the solid bodies into the comminution chamber. The filling opening can in particular be designed to be closable with a closure element. This means that only solid bodies can be introduced into the shredding chamber when the filling opening is open.

Preferably, the filling opening is opened facing counter to or essentially counter to the direction of gravity. This makes it possible, in particular, to introduce solid bodies from the solidification device through the filling opening into the comminution chamber exclusively by the weight force acting on the solid bodies.

According to a further preferred embodiment of the system it can be provided that the system comprises a filling funnel, that the filling funnel has a filling funnel inlet and a filling funnel outlet, that the filling funnel inlet defines a larger free cross-sectional area than the filling funnel outlet and that the filling funnel inlet is arranged at a greater distance from the filling opening than the hopper outlet. In this way, with the filling funnel, solid bodies can be introduced into the comminution chamber safely and without scattering losses through the filling opening in a defined manner, in particular solely due to the force of gravity.

It is favorable if the filling funnel outlet is arranged or formed against the direction of gravity above or above the filling opening, in particular directly. Such a configuration makes it possible, in particular, to introduce solid bodies into the comminution chamber completely and without scattering losses through the filling opening.

According to a further preferred embodiment of the invention it can be provided that the solidification device has a solidification device outlet and that the solidification device outlet is arranged or formed counter to the direction of gravity above or above the filling opening. This configuration makes it possible, in particular, to transfer solid bodies safely from the solidification device into the comminution chamber by means of a filling funnel.

It is advantageous if the solidifying device outlet is arranged or formed counter to the direction of gravity above or above the filling funnel inlet. This configuration enables solid bodies to fall directly from the solidifying device outlet into the filling funnel inlet due to the force of gravity.

It is favorable if the comminution device has a solid grain outlet for discharging the solid grains from the comminution device. For example, they can be heaped up after being discharged from the shredding device.

The solid grains can be discharged from the comminution chamber in a simple manner, in particular, in that the solid grain outlet is arranged or formed at the bottom of the comminution chamber in relation to the direction of gravity. In particular, the solid grain outlet can be arranged or formed on a floor of the comminution chamber.

It is favorable if the comminution chamber defines a comminution chamber and comprises at least one comminution chamber wall, if the at least one comminution chamber wall defines an inner wall surface delimiting the comminution chamber and if the inner wall surface is provided with a solid body anti-adhesive coating. This development makes it possible in particular to prevent the solid bodies from sticking or sticking to the at least one comminution chamber wall. The solid body anti-adhesive coating makes it possible in particular to crush solid bodies in the crushing device without additional precautions, for example such as sprinkling with dry granulate. This allows the system to be operated with a minimum of energy.

In particular, it can be provided that the at least one comminution chamber wall is designed in the form of a base of the comminution chamber. For example, the bottom of the comminution chamber can also be provided with a solid body anti-adhesive coating.

In order to further improve the safe operation of the system, it is advantageous if the at least one comminuting element is provided with a solid body anti-adhesive coating. The solid body anti-adhesive coating can in particular effectively prevent solid bodies or even already comminuted solid grains which still have a relatively high residual moisture in the order of about 40% to about 55% from adhering or sticking to the at least one comminuting element.

It is also advantageous if the filling funnel defines at least one inner filling funnel surface and if the at least one inner filling funnel surface is provided with a solid body anti-adhesive coating. Providing a solid body non-stick coating on the at least one inner hopper surface, in particular on all inner hopper surfaces, has the advantage, for example, that freshly formed solid bodies with a still high residual moisture cannot adhere to the at least one inner hopper surface when the hopper is used. Solid bodies that do not fall directly through the filling funnel through the filling opening into the crushing chamber without touching it can slide onto the at least one inner filling funnel surface and slide along it until they enter the crushing chamber through the filling opening.

The solid body anti-adhesive coating can be formed simply and inexpensively, in particular from at least one plastic, at least one ceramic and / or from at least one metal. In particular, materials or material combinations can be selected that have the lowest possible wear for operation of such a comminution device, so that the comminution device has the longest possible service life.

The at least one plastic is advantageously or contains polyethylene (PE), in particular ultra-high molecular weight polyethylene (UHMWPE), urethane and / or polyurethane (PU). Such plastics or plastic combinations can be produced easily and inexpensively and used to coat the comminution chamber of the at least one comminution element and / or the filling funnel.

Particularly long service lives of the shredding device and other components of the system can be achieved, for example, if the at least one metal is zinc or contains a zinc alloy.

In order to keep the residual concrete water in motion, it is advantageous if the system comprises a movement device for moving the collected residual concrete water. In particular, the movement device can be designed in the form of a stirring device.

The cleaning device can in particular be designed in one stage. It is advantageous if it is designed in several stages. In this way, solids and in particular sedimentable solids can be separated or removed from the residual concrete water in a more targeted and effective manner.

It is favorable if the cleaning device comprises a separating device for separating sedimentable solids in the form of fine and / or suspended particles from the residual concrete water. In particular, these fine and / or suspended particles can have a maximum diameter of 0.5 mm, in particular a maximum of 0.2 mm.

The residual concrete water can be cleaned in a simple manner if the cleaning device comprises at least one inclined clarifier and / or at least one lamellar clarifier and / or at least one hydrocyclone.

To form solid bodies, it is advantageous if the solidification device comprises a pressing device for pressing or compressing the separated or removed sedimentable solids in order to form solid bodies. When the solid bodies are pressed or pressed, even more water can in particular be pressed out of the still moist material. The sedimentable solids can be attached easily and safely and in the desired form.

The cleaning device is expediently designed in the form of a filter press. With the filter press, the solids can be separated on the one hand and compressed and dehydrated to a certain extent on the other. A residual moisture content of the solid bodies can thus be in a range from approximately 40% to approximately 55%.

It is also advantageous if the system comprises a drying device for drying the separated sedimentable solids. The drying device can in particular be designed to dry the sedimentable solids, for example before or after the comminution.

It is therefore advantageous if the drying device is connected upstream or downstream of the comminuting device. Optionally, several drying devices can also be provided, which dry the solid bodies before and the solid grains after the comminution.

In order to reduce a water content of the sedimentable solids before the solid bodies are formed, it is advantageous if the system comprises a thickening device for thickening the separated sedimentable solids before the solid bodies are formed.

The system preferably comprises at least one filter device for filtering the purified residual concrete water. The filter device can be used to further improve the quality of the purified residual concrete water, which, as already mentioned, is also referred to as residual water. In particular, it can be supplied to concrete production or to the system at any point where fresh water would otherwise have to be supplied or, if necessary, it can also be discharged into the sewer system.

It is favorable if the system comprises a residual water collection and / or residual water storage device for collecting and / or storing the purified residual concrete water as residual water. In particular, the residual water collection and / or residual water storage device can be designed in the form of a residual water collection container, for example as a tank or basin.

It is advantageous if the system comprises a first water density measuring device for measuring a density of the residual water in the residual water collecting and / or residual water storage device. The first water density measuring device makes it possible in particular to measure the water density of the residual water and thus to draw conclusions about the quality of the residual water.

Furthermore, it can be advantageous if the system comprises a residual water supply device for supplying residual water from the residual water collection and / or residual water storage device to the collecting device and / or to the cleaning device. In particular, the residual water supply device can be designed in the form of a line system which comprises one or more pumps for conveying the residual water.

It is advantageous if the system includes a pH value measuring device for measuring a pH value of the residual water. In particular, the pH value measuring device can be arranged or formed in or on the residual water collection and / or residual water storage device. In this way, a pH value of the residual water can be determined in order to then decide whether it is necessary to neutralize the residual water, for example if it is strong is angry. In particular, such a neutralization can also take place in an automated manner.

The system preferably comprises a neutralization device for neutralizing or essentially for neutralizing the residual water. In particular, the neutralization can take place automatically as a function of the pH value measured with the pH value measuring device. For example, the neutralization device can comprise a metering device for metering acids and / or alkalis for neutralizing basic or acidic residual water.

According to a further preferred embodiment of the invention it can be provided that the system comprises a second water density measuring device for measuring a density of the residual concrete water in the cleaning device. In particular, the second water density measuring device can be designed in the form of a continuously or discontinuously measuring second water density measuring device. The second water density measuring device can in particular be used to control and / or regulate the addition of fresh water or residual water as a function of the measured water density.

It is advantageous if the system comprises a water density target value specification device for specifying a water density target value of the residual concrete water and a control and / or regulating device interacting with the water density target value specification device for controlling and / or regulating the cleaning device in such a way that the Residual concrete water is cleaned until an actual water density value of the cleaned residual concrete water measured with the first or second water density measuring device corresponds to the water density target value or is less than the water density target value. For example, the setting of the actual water density value can be set by adding fresh and / or residual water. In particular, for this purpose the control and / or regulating device can be arranged or designed to cooperate with a fresh water or the residual water supply device.

Furthermore, it is advantageous if the system comprises a binder feed device for adding at least one binder to the separated sedimentable solids before and / or after the formation of solid bodies or solid grains. The binder supply device makes it possible, in particular, to add one or more binders or binder mixtures to the solids in order to form solid bodies or solid grains that are more dimensionally stable and solid.

It is advantageous if the binding agent supply device is in fluid connection with the collecting device and / or the cleaning device. This makes it possible in particular to add binding agents to the residual concrete water collected in the collecting device or when cleaning the residual concrete water.

The binder feed device is preferably designed in the form of a cement feed device. This makes it possible, in particular, to add binding agents in the form of cement to the residual concrete water in every stage of the process described above.

Furthermore, it is advantageous if the system comprises a filler and / or insulating material feed device for adding at least one filler and / or at least one insulating material to the solid grains before and / or after they are formed. In particular, all types of fillers or insulating materials that are conceivable for the formation of insulating materials or starting materials for the brick making industry or the building materials industry are conceivable here.

Solid body plates can be formed in a simple manner if the solidification device is designed in the form of a plate solidification device for forming the solid body in the form of plates. For example, the consolidation device can be designed in the form of a plate press.

Furthermore, the use of one of the systems described above for carrying out one of the methods described above is proposed. In particular, the system can be designed or operated as a closed system or an essentially closed system. In this way, the amount of fresh water required for treating the residual concrete water can be significantly reduced.

All of the feed devices described above can in particular be designed in the form of metering devices with which a quantity of the substances to be added or fed can be metered. In particular, the feed devices can be designed to interact with the control and / or regulating device in order to control and / or regulate an addition of the respective substances.

• 1: eine schematische Darstellung eines Ausführungsbeispiels eines Systems zur Aufbereitung von Betonrestwasser;
• 2: eine schematische Darstellung eines weiteren Ausführungsbeispiels eines Systems zur Aufbereitung von Betonrestwasser;
• 3: eine schematische Darstellung des Ablaufs einer Variante eines Verfahrens zur Aufbereitung von Betonrestwasser;
• 4: eine schematische Darstellung des Ablaufs einer weiteren Variante eines Verfahrens zur Aufbereitung von Betonrestwasser;
• 5: eine schematische Darstellung eines weiteren Ausführungsbeispiels eines Systems zur Aufbereitung von Betonrestwasser;
• 6: eine schematische Darstellung eines zweiten Ausführungsbeispiels eines Systems zur Aufbereitung von Betonrestwasser;
• 7: eine schematische Darstellung eines Ausführungsbeispiels einer Zerkleinerungseinrichtung eines Systems zur Aufbereitung von Betonrestwasser; und
• 8: eine schematische Darstellung eines Ausführungsbeispiels eines Einfülltrichters.

The following description of preferred embodiments of the invention is used in conjunction with the drawings to provide a more detailed explanation. Show it:

• 1 : a schematic representation of an embodiment of a system for treating residual concrete water;
• 2 : a schematic representation of a further exemplary embodiment of a system for processing residual concrete water;
• 3 : a schematic representation of the sequence of a variant of a method for treating residual concrete water;
• 4th : a schematic representation of the sequence of a further variant of a method for treating residual concrete water;
• 5 : a schematic representation of a further exemplary embodiment of a system for processing residual concrete water;
• 6th : a schematic representation of a second embodiment of a system for treating residual concrete water;
• 7th : a schematic representation of an embodiment of a comminution device of a system for processing residual concrete water; and
• 8th : a schematic representation of an embodiment of a filling funnel.

In 1 is schematically an embodiment of a total of the reference number 10 Designated system for the treatment of residual concrete water 12th shown, which in fresh concrete production as wastewater 14th accrues and contains fresh concrete or residual concrete.

The system 10 comprises a collection device 16 in the form of a collecting basin 18th for collecting the residual concrete water 12th .

For cleaning a concrete mixing plant 20th or a truck mixer 22nd water is used, especially fresh water, to remove concrete from the concrete mixing plant that has not yet set 20th or the truck mixer 22nd rinse out. The sewage 14th gets into the reservoir 18th and cached there.

The residual concrete water 12th is in the collection facility 16 with a movement device 24 moved to fine particles in residual concrete water 12th to keep in suspension and a silting up of the collecting device 16 to prevent. The movement device 24 can in particular in the form of a stirring device 26th be trained.

The residual concrete water 12th becomes from the collection facility 16 to a cleaning facility 28 for cleaning the residual concrete water 12th directed. The cleaning facility 28 is designed to clean residual concrete water 12th by separating sedimentable solids 30th . In particular, it can be designed in one or more stages.

The separated or removed sedimentable solids 30th become a solidification device 32 fed. The solidification device 32 forms from the separated solids 30th Solid body 34 .

The solid body 34 are from the solidification device 32 to one of the system 10 included crusher 36 to hand over. The shredding device 36 is designed to comminute the solid body 34 in solid grains 38 . These solid grains 38 can turn to the concrete plant 20th be supplied as raw material.

The cleaned and largely freed from the sedimentable solids residual concrete water 12th is called so-called residual water 40 the collection facility 16 fed. This can reduce the density of the in the collecting device 16 collected residual concrete water 12th to be humiliated.

Optionally, the system 10 a water density meter 42 include. With this, the water density of the residual concrete water 12th in the collection facility 16 or when conveying to the cleaning device 28 or in the cleaning facility 28 be measured.

Furthermore, a binder feed device can optionally be used 44 be provided for adding at least one binding agent, for example to the residual concrete water 12th before feeding to the cleaning device 28 .

As can be seen from the schematic representation in 1 the system enables it to be recognized 10 both for cleaning a concrete plant 20th or a truck mixer 22nd used wastewater enriched with fresh concrete or residual concrete 14th to clean and both those in sewage 14th sedimentable solids 30th as well as the residual water 40 essentially completely re-usable. In particular, a closed circuit can be created for both the water and the sedimentable solids 30th form. The amount of non-reusable waste in concrete production can thus be significantly reduced.

In 2 is the schematic structure of the system 10 shown in more detail. In the 1 parts and devices of the system shown and described above 10 are in 2 denoted by identical reference numerals. Optional devices and components of the system 10 are in 2 shown in dashed lines.

The solidification device 32 can be a solid-state unit as described 46 include to form solid bodies 34 . For example, the solid-state unit 46 be designed in the form of a plate hardener 48 for forming plate-shaped solid bodies 34 .

The solidification device 32 can also have a solid grain purity 50 include. In this are from the sedimentable solids 30th solid grains directly 38 educated. In particular, the solid grain unit 50 suitable matrices for producing, for example, pellet-shaped solid grains 38 include, through which the accumulated sedimentable solids 30th be pushed through. Also other forms for the formation of solid grains 38 are conceivable, for example, forms in which the sedimentable solids 30th filled in and into solid grains 38 , for example in the form of pebbles.

Includes the system 10 a solid grain unit 50 , can optionally also be used on the shredding device 36 be waived.

The solidification device 32 as well as the shredding device 36 are preferably designed for the production of solid grains 38 with an average grain size in a range from about 4 mm to about 50 mm. The mean grain size is favorably in a range from approximately 6 mm to approximately 25 mm. The solid grains 38 can thus be fed into fresh concrete production as a pebble-like material.

The system 10 can in particular a control and / or regulating device 52 include. An input device can also cooperate with or be comprised of this 54 for specifying the mean grain size of the solid grains 38 be. The control and / or regulating device 52 is therefore optional with the consolidation device 32 , especially with the solid grain unit 50 , and with the shredding device 36 cooperatively trained. So can a user of the system 10 simply specify the desired mean grain size. The shredding device 36 and also the solidification device 32 for the formation of solid grains 38 can then be adapted mechanically in particular in such a way that the solid grains formed 38 have the desired mean grain size.

The shredding device 36 can in particular in the form of a mechanical shredding device 36 be trained. For example, this can have one or more breaker rollers 56 and / or one or more press rams 58 include to the solid body 34 that have not yet reached the size of the desired solid grains 38 are crushed to be crushed in the desired manner.

The cleaning facility 28 can in particular be designed in one or more stages and one or more cleaning stages 60 , 62 and 64 include. In 2 are the cleaning stages schematically 62 and 64 shown in dashed lines as optional cleaning stages.

The cleaning facility 28 can in particular a separating device 66 to separate the sedimentable solids 30th from the residual concrete water 12th include. The separation device 66 In particular, it enables the fine and / or suspended particles from the residual concrete water 12th disconnect or remove.

Every purification level 60 , 62 and 64 can use a suitable separating device 66 , 68 or 70 be assigned. In particular, the cleaning stages 60 , 62 , 64 also the separation devices 66 , 68 and 70 include.

The cleaning facility 28 can in particular separation devices 66 , 68 and 70 in the form of inclined clarifiers, lamellar clarifiers and / or hydrocyclones. These devices allow the separation of the finest particles and suspended matter from the residual concrete water in a simple manner 12th .

Furthermore, the solidifying device 32 a pressing device 72 include, with which the separated or removed sedimentable solids 30th from the residual concrete water to solid bodies 34 or solid grains 38 can be pressed or grouted. At the pressing device 72 it can in particular be a mechanical press for forming plate-shaped solid bodies 34 that continue to solid grains 38 Can be crushed, or a die press, directly to solid grains 38 train by pressing.

The system can also 10 optionally a drying device 74 include. This can in particular be designed around that of the solidification device 32 formed solid grains 38 to dry. Correspondingly, it is the solidifying device 32 downstream.

Will be with the solidification device 32 Solid body 34 formed that are larger than the ultimately desired solid grains 38 the drying device 74 the shredding device 36 be upstream or downstream. There is therefore the option of using the solid bodies that are still to be shredded 34 to dry before crushing or the solid grains that have already been crushed 38 to dry.

Furthermore, the system can 10 optionally a thickening device 76 for thickening the separated sedimentable solids 30th include. The thickening device 76 can in particular the solidifying device 32 be upstream.

About the purified residual concrete water 12th The system can upgrade its quality even further 10 a filter device 78 include. The purified residual concrete water 12th , hence the residual water 40 , which from the cleaning device 28 is released, can be filtered and cleaned further.

To the system 10 in particular to be able to operate continuously, it is advantageous if the system 10 furthermore a residual water collection and / or residual water storage device 80 for collecting and / or storing the residual water 40 includes. It can be used in particular as a residual water collection container 82 be trained.

Optionally, in the residual water collection and / or residual water storage device 80 a water density meter 84 be formed with the control and / or regulating device 52 is connected. This allows the remaining water to be watertight 40 determine and in particular the cleaning equipment 28 , which with the control and / or regulating device 52 is designed to cooperate, control and / or regulate accordingly.

About the remaining water 40 the collection facility 16 can also supply a residual water supply device 86 be provided. Several such residual water supply devices are optional 86 foreseeable, especially for residual water 40 from the residual water collection and / or residual water storage device 80 the cleaning device 28 to feed.

The system may further include a pH measuring device 88 for measuring a pH of the residual water 40 include. In particular, the pH value measuring device 88 can be in the residual water collection and / or residual water storage device 80 be arranged or formed. It is optional with the control and / or regulating device 52 coupled to the measured pH of the residual water 40 to be transferred to this.

The measured pH value can in particular be used with an optional neutralization device 90 the residual water 40 to neutralize or essentially to neutralize, in particular automatically, in particular as a function of the pH value measured with the pH value measuring device 88. The neutralization device 90 can in particular from the control and / or regulating device 52 can be controlled.

The watertightness measuring device already described above 42 for measuring a density of the residual concrete water 12th can especially in the cleaning facility 28 be arranged or formed. It can be designed for continuous or discontinuous measurement of the water density. In particular, the measured water density value can be applied to that with the water density measuring device 42 coupled control and / or regulating device 52 be transmitted.

The control and / or regulating device 52 In particular, a water density target value specification device can be used 92 for specifying a water density target value for the residual concrete water 12th include or be designed to cooperate with this. The control and / or regulating device 52 is designed in particular to control and / or regulate the cleaning device 28 such that the residual concrete water 12th is cleaned until one of the water density measuring devices 42 or 84 Measured actual water density of the cleaned residual concrete water 12th or the residual water 40 corresponds to the waterproof target value or is less than the specified waterproof target value.

As already described above, the optional binder feed device 44 the residual concrete water 12th in front of the cleaning facility 28 Add binder. A further binder feed device can optionally be used 44 also be arranged in such a way that they match the solid grains formed 38 Adding binder. It can therefore also be the solidifying device 32 , especially the solid grain unit 50 , or the shredding device 36 be downstream. In particular, the binder supply devices 44 the optional drying devices 74 be upstream. So can the solid grains 38 dry with the added binder.

The binder supply device 44 can in particular be designed in the form of a cement feed device to remove the residual concrete water 12th or the separated solids 30th and / or the solid grains 38 to supply the desired amount of binder in the form of cement.

The system can also 10 a filler and / or insulating material feed device 94 include one or more fillers and / or one or more insulating materials to the solid grains 38 feed, namely before these are formed, so in particular the solidifying device 32 upstream or downstream of this.

With the system described 10 In particular, the methods described above for treating residual concrete water can be used 12th carry out. In these processes, as shown schematically in 3 shown, the sedimentable solids 30th to solid bodies 34 or to solid grains 38 shaped. Are the solid bodies 34 The solid bodies become larger than the desired solid grains 34 alternative to solid grains 38 crushed.

4th shows an expanded flow chart of an exemplary embodiment of a method.

Collected residual concrete water 12th is cleaned and the sedimentable solids 30th separated by cleaning. As in 3 shown and described above for solid grains 38 are further processed.

The residual water that occurs during cleaning 40 can in particular the residual concrete water 12th are supplied to a density of the concrete residual water 12th lower. Optionally, the residual water 40 before adding to the residual concrete water 12th also be filtered.

As in particular in 4th shown schematically, a self-contained water circuit for treating the residual concrete water 12th be formed. Water losses in this cycle can be compensated for by adding fresh water, for example.

In 5 is schematically a whole with the reference number 10 Designated further embodiment of a system for the treatment of residual concrete water 12th shown schematically, which in the fresh concrete production as wastewater 14th accrues and contains fresh concrete or residual concrete. To name the system 10 and its components, the same reference numerals are used as in connection with the above-described exemplary embodiments of systems 10

The further embodiment of the system 10 comprises a collection device 16 in the form of a collecting basin 18th for collecting the residual concrete water 12th .

That for cleaning the concrete mixing plant 20th or a truck mixer 22nd used water is called sewage 14th into the reservoir 18th and cached there.

With the movement device 24 is the residual concrete water 12th moved in order to keep fine particles in suspension and a silting up of the collecting device 16 to avoid. In particular, the movement device comprises 24 a stirring device 26th .

By means of a pump 100 is the residual concrete water 12th from the collection container 16 through a connecting line 102 to the consolidation device 32 directed.

Between the pump 100 and the solidification device 32 are in the connecting line 102 a water density meter 42 and a first valve 104 interposed to ensure water tightness in the residual concrete water on the one hand 12th to determine and on the other hand the connection line 102 to open or close if necessary.

The solidification device 32 is via another connection line 106 again with the collection facility 16 connected. Through the connecting line 106 can from the residual concrete water 12th removed residual water 40 from the solidification device 32 back to the reservoir 18th be directed.

In the connecting line 106 a second valve is arranged to open or close it as required.

The connecting line 102 and the connection line 106 are via a bypass line 110 connected with each other. The bypass line 110 is between the water density meter 42 and the first valve 104 fluid-effective with the connecting line 102 connected as well as between the second valve 108 and the reservoir 18th with the connecting line 106 . For opening and closing the bypass line 110 is a third valve in this 112 arranged.

The solidification device 32 is in the form of a filter press 114 educated. This cleans the residual concrete water 12th and solidifies the sediments and fine particles contained therein into solid bodies 34 in particular in the form of filter cakes 116 are trained.

The water density measuring device 42 is used during the pumping of the residual concrete water 12th with the pump 100 from the reservoir 18th to the consolidation device 32 the water density of the incoming concrete residual water 12th to be determined continuously.

The three provided valves 104 , 108 and 112 enable in particular an operator of the system 10 to decide from which water density the concrete residual water 12th is cleaned. In particular, the system can be controlled in such a way that when a predetermined water density is exceeded, the water density measuring device 42 is determined, for example at a density of at least 1.07 kg / l, the first valve 104 is opened and the residual concrete water 12th into the filter press 114 got. The third valve 112 is closed. The solidification device 32 is put into operation and that in the residual concrete water 12th contained sediments by filtering and simultaneous pressing out of the residual concrete water 12th away.

The purified residual water 40 is through the connecting line 110 with the second valve open 108 into the reservoir 18th returned.

The cleaning process described or this operating mode of the system 10 is continued until the concrete residual water 12th that through the connecting line 102 is pumped, falls below the specified target value or limit value of the desired water density.

If the water density falls below the specified limit value determined by the water density measuring device 42 is determined, the solidifying device stops 32 . An interruption in operation of the same can take place, for example, for an adjustable time, such as in particular 30 minutes.

After the specified interruption time has elapsed, the water density is measured automatically with the water density measuring device 42 carried out. This is the first valve 104 and the second valve 108 closed, but the third valve 112 opened so that the residual concrete water 12th through the connecting line 102 , the water density meter 42 , the connecting line 110 and the connection line 106 back to the reservoir 18th can flow.

If the specified limit value for the water density is not reached, the pump can either be operated 100 can be interrupted for a specific predeterminable time, for example for five minutes or for ten minutes, and then resumed again to ensure the water density in the residual concrete water 12th to be determined in the manner described.

If the specified limit value for the water density is exceeded again, the third valve is activated 112 closed and the first valve 104 and the second valve 108 are reopened as well as the operation of the filter press 114 is started.

The filter press 114 generated as described from the residual water in the concrete 12th remaining sediments a filter cake 116 . This typically has a residual moisture content of about 45% to about 50%.

Referred to by the arrow 118 The symbolized direction of gravity is directly below or below the filter press 114 the shredding device 36 arranged. In this there is at least one shredding element 120 arranged or designed to remove the filter press 114 falling solids in the form of the filter cake 116 to shred.

The shredding device 36 can in particular have several shredding elements 120 in the form of worm shafts 122 include. A drive device 124 is with the crushing elements 120 cooperatively arranged and designed around the worm shafts 122 around its longitudinal axis 126 to rotate.

The crushing elements 120 are in a shredding chamber 128 arranged, which several shredding chamber walls 130 and in particular a floor 132 includes. The shredding chamber walls 130 and the floor 132 delimit a crushing room 129 , in which the crushing of the solid matter 34 is carried out.

In the ground 132 is a solid grain outlet 134 arranged, which can optionally be closed with a closure flap. Through the solid grain outlet 134 can be used in the shredder 36 , also as a granulator 136 designated, formed solid grains 38 be carried out.

Both interior wall surfaces 138 as well as the crushing elements 120 are with a solid body non-stick coating 140 provided to prevent the filter cake from sticking or sticking 116 as well as the solid grains comminuted from this 138 to avoid. In particular, it is possible to remove the filter cake without an additional transport device 116 , so the solid body 34 , directly from the consolidation device 32 into the shredding device 36 to hand over. For this purpose, based on the direction of gravity, at the bottom of the solidifying device 32 a solidifier outlet 142 be provided, which is closed, for example, with a closure flap, while the solidification device 32 is operated.

The closure flap is used to discharge the filter cake that has formed 116 opened to the solidifier outlet 142 free to give so that the filter cake 116 , hence the solid body 34 , solely because of the force of gravity acting on it 118 , therefore only by its weight, from the solidifying device 32 into the shredding device 36 through a filling opening 144 same in the crushing chamber 128 can fall.

As already mentioned several times, there is thus between solidification, i.e. the formation of a solid body 34 from the separated or removed sedimentable solids, and the step of comminuting, no additional intermediate step is required, in particular no active transport step, which is carried out in the prior art with a conveyor device, for example a conveyor belt.

The described embodiment of a system 10 can thus in particular be made particularly compact. For example, a conventional transport container, such as is used, for example, as an overseas container, is sufficient for the consolidation device 32 and the crusher 36 take up as well as the valves 104 , 108 and 112 . Corresponding connections can then be provided on the transport container with the connecting lines 106 and 102 can be fluidically connected. The bypass line 110 can also be arranged on such a container. Such an arrangement enables, in particular, a mobile use of the system 10 .

For the sake of completeness it should be mentioned that with another pump 146 uncleaned residual concrete water 12th from the collection facility 16 via a connecting line 148 the concrete plant 20th can be fed.

6th Figure 3 shows another embodiment of a system 10 , in which again the same reference numerals to designate identical or similar components as in connection with 5 described embodiment are used.

For controlling and / or regulating the system 10 the control and / or regulating device is used in particular 52 which are particularly effective in controlling with the water density measuring device via control lines 42 , the first valve 104 , the second valve 108 , the third valve 112 , the drive device 124 , a drive device 150 the solidification device 32 and the movement device 24 is connected effectively to control to set the components described in motion, to operate and to operate in the desired manner.

The collection facility 16 can in particular have an inlet 152 for the sewage 14th , an outlet 154 , which with the connecting line 148 is fluidly connected to the discharge of residual concrete water 12th by means of the pump 146 to the concrete mixing plant 20th as well as a concrete residual water outlet 156 , which with the connecting line 102 is fluidly connected, have.

Furthermore, at the collection facility 16 optionally a residual water inlet 158 , which fluidly interacts with the connecting line 106 is connected, be provided.

As mentioned, the operation of the system 10 by means of the control and / or regulating device 52 controlled and / or regulated. In particular, an input device can optionally be provided in order to set a desired limit value for the water density for starting the solidification device 32 to deposit. The system 10 can then automatically perform the operation described above.

A schematic representation of an embodiment of a comminution device 36 is in 7th shown.

The shredding device 36 includes a crushing chamber 128 with shredding chamber walls 130 , one of which in the form of a floor 132 is formed and which has a crushing chamber 129 limit. In the shredding chamber 128 are four shredding elements 120 in the form of around their longitudinal axes 126 rotating worm shafts 122 arranged.

The four worm shafts 122 are with their longitudinal axes 126 aligned parallel to each other. The worm shafts include a cylindrical shaft 160 which is a spiral 162 carries, on the edge facing away from the longitudinal axis, a plurality of comminuting members 166 in the form of saw teeth 168 are trained.

Both interior wall surfaces 138 the walls of the shredding chamber 130 as well as the worm shafts 122 are optional with a solid body non-stick coating 140 Mistake. This prevents the solid body to be comminuted from sticking 34 as well as the crushed solid grains 38 .

In another embodiment of a system 10 for the treatment of residual concrete water 12 can for simple introduction of the solid bodies 34 into the shredding device 36 between the solidifier outlet 142 and the filling opening 144 a funnel 170 be arranged, which has a hopper inlet 172 and a hopper outlet 174 having. The hopper inlet 172 has a larger free cross-sectional area than the hopper outlet 174 .

The hopper inlet 172 is the solidifier outlet 142 facing and arranged below the same in relation to the direction of gravity. The hopper outlet 174 is the filling opening 144 facing and arranged in the direction of gravity above this.

An inner hopper face 176 is preferably also with a solid body non-stick coating 140 provided to prevent sticking of the solid body 34 when coming into contact with the inner hopper surface 176 to avoid and ensure safe and continuous operation of the system 10 to enable.

The solid body non-stick coating 140 is formed, for example, from one or more plastics, at least one ceramic and / or from at least one metal.

In particular, polyethylene (PE) and in particular ultra-high molecular weight polyethylene (UHMWPE), urethane and / or polyurethane (PU) or combinations of these plastics can be used as plastics.

A suitable solid body anti-adhesive coating can be formed, for example, from TempCoat 1023 from Impreglon. It is a special fluoropolymer system with good non-stick and sliding properties.

Alternatively, ultra-high molecular weight polyethylene sold by ThyssenKrupp under the name PE 1000 is used as a solid body non-stick coating 140 for use.

Another option are urethane coatings from Tandem Products, Inc., particularly under the “RHINO HYDE ^{®” brand.}

Alternatively, the crushing elements 120 and / or the inner hopper surfaces 176 and / or the wall surfaces 138 the walls of the shredding chamber 130 be coated with zinc.

Advantageously, the solid body exhibits a non-stick coating 140 not only has the desired non-stick properties, but also sufficiently good sliding properties that allow the solid bodies to slide off optimally 34 as well as the solid grains 38 on the mentioned surfaces of the shredding device 36 and the optional feed hopper 170 enable.

An essential part of the systems 10 are the shredding device 36 or the solidification device 32 that make it possible to get out of the sedimentable solids 30th , which up to now had to be disposed of as hazardous waste in a complex or costly manner, are valuable raw materials in the form of solid grains for concrete production 38 or as raw materials in the form of solids 34 to train.

The wastewater that inevitably occurs during concrete production can be removed in the manner described 14th essentially completely reprocess, on the one hand in residual water 40 and on the other hand in solids 34 or solid grains 38 .

List of reference symbols

10

system

12th

Residual concrete water

14th

sewage

16

Collection facility

18th

Reservoir

20th

Concrete mixing plant

22nd

Truck mixer

24

Movement device

26th

Stirring device

28

Cleaning facility

30th

Solids

32

Solidifying device

34

Solid body

36

Shredding device

38

Solid grains

40

Residual water

42

Watertightness measuring device

44

Binder feed device

46

Solid state unit

48

Plate hardener

50

Solid grain unit

52

Control and / or regulating device

54

Input device

56

Crushing roller

58

Press ram

60

Cleaning level

62

Cleaning level

64

Cleaning level

66

Separation device

68

Separation device

70

Separation device

72

Pressing device

74

Drying device

76

Thickening device

78

Filter device

80

Residual water collection and / or residual water flushing device

82

Residual water collecting tank

84

Watertightness measuring device

86

Residual water supply device

88

pH value measuring device

90

Neutralization device

92

Watertightness setpoint presetting device

94

Filler and / or insulating material feed device

100

pump

102

Connecting line

104

first valve

106

Connecting line

108

second valve

110

Bypass line

112

third valve

114

Filter press

116

Filter cake

118

arrow

120

Shredding element

122

Worm shaft

124

Drive device

126

Longitudinal axis

128

Shredding chamber

129

Crushing room

130

Shredding chamber wall

132

ground

134

Solid grain outlet

136

Granulator

138

Wall surface

140

Solid body non-stick coating

142

Solidifier outlet

144

Filling opening

146

pump

148

Connecting line

150

Drive device

152

inlet

154

Outlet

156

Concrete residual water outlet

158

Residual water inlet

160

wave

162

spiral

166

Shredding link

168

Sawtooth

170

Feed hopper

172

Hopper inlet

174

Hopper outlet

176

Hopper surface

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 5554297 [0007, 0009, 0046]

Claims (49)

System for the treatment (10) of residual concrete water (12), which occurs as waste water (14) in the fresh concrete production and contains fresh return or residual concrete, comprising a collecting device (16) for collecting the residual concrete water (12) and a cleaning device (28) for Cleaning of the residual concrete water (12), which cleaning device (28) is designed to clean the residual concrete water (12) by separating off solids, which cleaning device (28) is a solidifying device (32) for forming solid bodies (34) from the separated solids (30) wherein the system (10) comprises a comminution device (36) for comminuting the solid bodies (34) into solid grains (38), characterized in that the comminution device (36) is arranged or formed directly downstream of the solidification device (32) without the interposition of a conveyor device is. System according to Claim 1 , characterized in that the solidification device (32) is arranged or formed directly above or above the comminution device (36) in relation to the direction of gravity (118). System according to one of the preceding claims, characterized in that the comminution device (36) is designed to produce solid grains (38) with an average grain size in a range from approximately 4 mm to approximately 50 mm, in particular in a range from approximately 6 mm to about 25 mm. System according to Claim 3 , characterized by an input device (54) for specifying the mean grain size of the solid grains (38). System according to one of the preceding claims, characterized in that the shredding device (36) is designed in the form of a mechanical shredding device (36). System according to Claim 5 , characterized in that the mechanical comminution device (36) comprises at least one comminution element (120) for comminuting the solid bodies (34) into solid grains (38). System according to Claim 6 , characterized in that the comminution device (36) comprises two, three, four, five, six or more comminution elements (120). System according to Claim 6 or 7th , characterized in that the at least one comminuting element (120) is designed in the form of a worm shaft (122). System according to Claim 8 , characterized in that the worm shaft (122) is spiral-shaped and is provided with a plurality of comminuting members (166) on its outer circumference. System according to Claim 9 , characterized in that the plurality of comminution members (166) is designed in the form of saw teeth (168) pointing away in the radial direction from a longitudinal axis (126) defined by the worm shaft (122). System according to one of the Claims 6 to 10 , characterized in that the comminution device (32) comprises a comminution chamber (128) and that the at least one comminution element (120) is arranged or formed in the comminution chamber (128). System according to one of the Claims 6 to 11 , characterized in that the at least one comminuting element (120) is arranged or designed to be movable, in particular rotatable. System according to one of the Claims 6 to 12th , characterized in that the comminution device (36) comprises a drive device (124) for driving the at least one comminution element (120). System according to one of the preceding claims, characterized in that the comminution device (36) has at least one filling opening (144) for introducing the solid bodies (34) into the comminution chamber (128). System according to Claim 14 , characterized in that the filling opening (144) is opened facing opposite or essentially opposite to the direction of gravity (118). System according to Claim 14 or 15th , characterized in that the system (10) comprises a hopper (170), that the hopper (170) has a hopper inlet (172) and a hopper outlet (174), that the hopper inlet (172) defines a larger free cross-sectional area than the hopper outlet (174) and that the filling funnel inlet (172) is arranged at a greater distance from the filling opening (144) than the filling funnel outlet (174). System according to Claim 16 , characterized in that the filling funnel outlet (174) is arranged or formed counter to the direction of gravity (118) above or above the filling opening (144), in particular directly. System according to one of the Claims 14 to 17th , characterized in that the solidification device (32) has a solidification device outlet (142) and that the solidification device outlet (142) is arranged or formed counter to the direction of gravity (118) above or above the filling opening (144). System according to Claim 18 , characterized in that the solidifying device outlet (142) is arranged or formed counter to the direction of gravity (118) above or above the filling funnel inlet (172) System according to one of the preceding claims, characterized in that the comminution device (36) has a solid grain outlet (134) for discharging the solid grains (38) from the comminution device (36). System according to Claim 20 , characterized in that the solid grain outlet (134) is arranged or formed at the bottom of the comminution chamber (128) in relation to the direction of gravity (118), in particular on a bottom (132) of the comminution chamber (128). System according to one of the Claims 11 to 21 , characterized in that the crushing chamber (128) defines a crushing space (129) and comprises at least one crushing chamber wall (130), that the at least one crushing chamber wall (130) defines an inner wall surface (138) delimiting the crushing space (129) and that the inner Wall surface (138) is provided with a solid body non-stick coating (140). System according to Claim 22 , characterized in that the at least one crushing chamber wall (130) is designed in the form of a floor (132) of the crushing chamber (128). System according to one of the Claims 6 to 23 , characterized in that the at least one comminuting element (120) is provided with a solid body anti-adhesive coating (140). System according to one of the Claims 16 to 24 , characterized in that the hopper (170) defines at least one inner hopper surface (176) and that the at least one inner hopper surface (176) is provided with a solid body anti-adhesive coating (140). System according to one of the Claims 22 to 25th , characterized in that the solid body anti-adhesive coating (140) is formed from at least one plastic, at least one ceramic and / or from at least one metal. System according to Claim 26 , characterized in that the at least one plastic is or contains polyethylene (PE), in particular ultra-high molecular weight polyethylene (UHMWPE), urethane and / or polyurethane (PU). System according to Claim 26 or 27 , characterized in that the at least one metal is zinc or contains a zinc alloy. System according to one of the preceding claims, characterized by a moving device (24) for moving the collected residual concrete water (12), in particular in the form of a stirring device (26). System according to one of the preceding claims, characterized in that the cleaning device (28) is designed in several stages. System according to one of the preceding claims, characterized in that the cleaning device (28) comprises a separating device (66) for separating sedimentable solids (30) in the form of fine and / or suspended particles from the residual concrete water (12). System according to one of the preceding claims, characterized in that the solidification device (32) comprises a pressing device (72) for pressing or compressing the separated or removed sedimentable solids (30) to form solid bodies (34). Device according to one of the preceding claims, characterized in that the cleaning device (28) is designed in the form of a filter press (114). System according to one of the preceding claims, characterized by a drying device (74) for drying the separated sedimentable solids (30). System according to Claim 34 , characterized in that the drying device (74) is connected upstream or downstream of the comminuting device (36). System according to one of the preceding claims, characterized by a thickening device (76) for thickening the separated sedimentable solids (30) before solid bodies (34) are formed. System according to one of the preceding claims, characterized by at least one Filter device (78) for filtering the purified residual concrete water (12). System according to one of the preceding claims, characterized by a residual water collection and / or residual water storage device (80) for collecting and / or storing the purified concrete residual water (12) as residual water (40), in particular in the form of a residual water collection container (82). System according to Claim 38 , characterized by a first water density measuring device (84) for measuring a density of the residual water (40) in the residual water collecting and / or residual water storage device (80). System according to Claim 38 or 39 , characterized by a residual water supply device (86) for supplying residual water (40) from the residual water collecting and / or residual water storage device (80) to the collecting device (16) and / or to the cleaning device (28). System according to one of the Claims 38 to 40 , characterized by a pH value measuring device (88) for measuring a pH value of the residual water (40), in particular in the residual water collecting and / or residual water storage device (80). System according to one of the Claims 38 to 41 , characterized by a neutralization device (90) for neutralizing or essentially neutralizing the residual water (40), in particular as a function of the measured pH value. System according to one of the preceding claims, characterized by a second water density measuring device (42) for measuring a density of the residual concrete water (12) in the cleaning device (28), in particular in the form of a continuously or discontinuously measuring second water density measuring device (42). System according to Claim 43 , characterized by a water density target value setting device (92) for setting a water density target value for the residual concrete water (12) and a control and / or regulating device (52) cooperating with the water density target value setting device for controlling and / or regulating the cleaning device (28) in such a way that the residual concrete water (12) is cleaned until an actual water density value of the cleaned residual concrete water (12, 40) measured with the first or second water density measuring device (42, 84) corresponds to the water density target value or less than that Watertightness setpoint is. System according to one of the preceding claims, characterized by a binder feed device (44) for adding at least one binder to the separated sedimentable solids (30) before and / or after the formation of solid bodies (34) or solid grains (38). System according to Claim 45 , characterized in that the binding agent supply device (44) is in fluid communication with the collecting device (16) and / or the cleaning device (28). System according to Claim 45 or 46 , characterized in that the binder feed device (44) is designed in the form of a cement feed device. System according to one of the preceding claims, characterized by a filler and / or insulating material feed device (94) for adding at least one filler and / or at least one insulating material to the solid grains (38) before and / or after they are formed. System according to one of the preceding claims, characterized in that the consolidation device (32) is designed in the form of a plate consolidation device (48) for forming the solid bodies (34) in the form of plates.

Images