• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for dewatering sludge, wherein a sludge is added to a defined amount of flocculant, after which the sludge is at least partially dewatered. In order to achieve optimal dewatering, it is provided according to the invention that a change in weight of the sludge is measured during dewatering of the sludge and the amount of flocculant is adjusted depending on the measured weight change. Furthermore, the invention relates to a device (1) for dewatering sludge.
    公开号:AT514909A1
    申请号:T763/2013
    申请日:2013-10-03
    公开日:2015-04-15
    发明作者:Artur Salawa；Erich Grasmuck；Christoph Spielmann
    申请人:Andritz Ag Maschf；
    IPC主号:
    专利说明:

    Sludge dewatering method and apparatus therefor
    The invention relates to a method for dewatering sludge, wherein a sludge is added to a defined amount of flocculant, after which the sludge is at least partially dewatered.
    Furthermore, the invention relates to a device for dewatering of sludge, comprising a Flockungsmittelzuführeinrichtung, with which a certain amount of flocculant is fed to the sludge, and one of the Flockungsmittelzuführeinrichtung downstream sieve, wherein the sieve for separating materials of different consistency is formed and wherein sludge along a conveying direction is movable with the sieve.
    Methods for dewatering sludges have become known in the prior art in which sludges such as sewage sludge or paper pulp are dewatered with the addition of a flocculant. In a first step, the flocculant is added to the sludge to cause flocculation in the sludge, after which the sludge is moved over a strainer or sieve so that liquid in the sludge drains through the strainer while dry flocs of sludge on the strainer remain. As a result, the mud is dried or dehydrated.
    In such methods, dosage of the flocculant is an important parameter. On the one hand, a desired dry content can be achieved only with a correct dosage, since both an over flocculation and an under flocculation adversely affect an efficiency of dewatering or a Seihvorganges. On the other hand, the flocculant itself causes costs, so that an excessive admixture of the flocculant in addition to an increase in the cost of the process leads. Usually, a flocculant amount added to the sludge is manually adjusted by an operator who visually detects a flocculation state of the sludge. However, there are high demands on the operator both in terms of a judgment ability of a proper flocculation state and in terms of endurance and alertness. Such is the impact of a change
    Flockungsmittelmenge usually only after several minutes recognizable, because after an admixture of the flocculant at a mixing position several minutes pass, in which the flocculation occurs before the sludge reaches the sieve. This dead time between a change in the amount of flocculant and the detection of a change in a drainage performance achieved thereby leads to great problems in known systems. In addition, it is usually not apparent to an operator whether the dewatering performance can be improved by increasing or reducing the amount of flocculant, as both overdosing and underdosing of flocculant will result in poor dewatering performance. As a result, proper metering of the flocculant is difficult to achieve in prior art processes, which generally do not operate the processes at an optimum operating point, so that only low dewatering performance or high flocculant consumption is achieved.
    The object of the invention is therefore to provide a method of the type mentioned, in which a proper amount of flocculant is guaranteed, so that an optimal drainage performance is achieved.
    Next, a device of the type mentioned above, with which such a method can be implemented.
    The first object is inventively achieved in that in a method of the type mentioned a change in weight of the sludge during dewatering of the sludge is measured and the amount of flocculant is adjusted depending on the measured weight change.
    By measuring the change in weight is given an objective value of the drainage performance, which is used to adjust or change the amount of flocculant. An error-prone assessment of the flocculation state by the operating personnel is thus no longer mandatory to adjust the flocculant, so that due to the correct amount of flocculant in the process improved drainage performance is achieved. The dewatering capacity indicates the amount of liquid which is removed from the sludge per unit time in the process. Furthermore, the method according to the invention can also be carried out automatically, because with the measured change in weight there is an objectively measurable controlled variable which can be incorporated into a regulation of a flocculant supply device. The weight change of the sludge between two points in time essentially corresponds to the weight of the liquid or of the water which leaves the sludge through the sieve between these times and is proportional to the dewatering capacity. A sludge remaining on the sieve thus has a lower water content with increasing time.
    Preferably, the sludge is moved after admixture of the flocculant with a sieve along a conveying direction, wherein at least partially dehydration takes place. By the movement of the sludge during dewatering on the one hand, an improved drainage performance can be achieved. On the other hand, this also makes a process easy to implement, wherein a continuous sludge flow is continuously moved and thereby dehydrated.
    In order to achieve a very good dewatering performance with an optimized amount of flocculant, it has proved to be advantageous if an optical appearance of the sludge during dewatering is detected and the amount of flocculant is also changed depending on the optical appearance of the sludge. Because, in addition to the weight difference, a further parameter for assessing a flocculation behavior is present, a regulation of the flocculant quantity can be adapted particularly precisely to the flocculation state of the sludge. It is advantageous if the sludge is moved after introduction of the flocculant with a sieve past at least one chicane, wherein the sludge flows around the at least one chicane, wherein a ratio of a sludge-covered surface of the sieve to a non-sludge-covered surface the sieve is optically detected in a defined control area behind the at least one chicane and the amount of flocculant is also changed depending on this ratio. From the ratio of a sludge-covered surface to a non-sludge-covered surface, the viscosity of the sludge can be measured in a particularly simple manner in a range which is relevant for a good dewatering performance of the process. Although no precise value of the viscosity of the sludge can be determined with this method, it is still possible to reliably obtain a sufficiently accurate value
    Determination of the viscosity to optimally adapt the flocculant to the flocculation state. For example, if the amount of flocculant is too small, the sludge will evenly drain behind the baffles on the screen, which usually forms a silt zone, so that one surface of the screen is completely covered by mud. However, from a certain amount of flocculant, the sludge suddenly begins to granulate more and more, so that the sludge no longer completely drains behind the at least one chicane in the conveying direction and part of the surface of the sieve is recognizable. In this operating state, an effect of the flocculant is already pronounced and a machine on which the process is implemented, although the sludge is still too wet at this operating point, so that no optimal operation is possible.
    As the amount of flocculant increases further, the sludge dries, making a larger portion of the surface of the screen visible in the control area behind the baffles. Overdose is seen when, despite the increase in flocculant level, there is no further enlargement of a non-slurry covered surface of the sieve or the ratio of a sludge-covered surface of the sieve to a non-slurry-covered surface of the sieve no longer changes.
    Because the ratio of a sludge-covered surface of the sieve to a non-sludge-covered surface of the sieve varies greatly with little change in the amount of flocculant, a control that takes this ratio into account is very well suited to maintaining a pre-defined operating point. Due to the stable corner points of the control, the creation of a sludge-free surface and the achievement of a maximum sludge-free surface of the sieve, the control remains robust, so that both overdosing and underdosing of flocculants can be detected easily and reliably. A very robust method is achieved when a camera, in particular a digital camera, continuously detects the control area and the ratio of sludge-covered surface to non-sludge-covered surface is determined by pixel evaluation, preferably using a color criterion between sludge covered surface and not covered by mud
    Surface is differentiated. The control area is usually a rectangle in a camera-generated image of the device in the conveying direction behind the chicane. It is understood that if multiple baffles are provided, several areas behind bullying can also be used for the evaluation, which are detected by one or more digital cameras. Typically, an automated distinction is made between the mud-covered surface and the non-mud-covered surface by the use of a color criterion, which classifies pixels of the area as either a mud-covered surface or a non-mud-covered surface. By counting the thus classified pixels, the ratio can then be easily formed. For this purpose, it is advantageous if the surface of the screen has a well distinguishable from the mud color and / or a different brightness. It has been found that a control in consideration of this ratio is stable even if the conveying speed of the sludge or the changed amount of sludge per unit time is changed, if a defined ratio is selected as the desired value.
    Advantageously, a rotating sieve is used. As a result, a simple and easy controllable conveying the sludge is possible. As a rule, a drain for liquid removed from the sludge is provided under the sieve. In most cases, the rotating sieve is guided over three deflection rollers, so that the sieve essentially describes a triangular path.
    The method is particularly easy to implement if a weight load of the sieve is measured to measure the change in weight at at least two, preferably three positions along the conveying direction. In this case, a measurement of the absolute weight of the sludge is not required, so that bearing forces of the sieve can be measured. Furthermore, only a deformation of the sieve can be measured at several positions and thereby be deduced to a load at the respective position. Over a distance between the positions at which the weight load is measured, and the conveying speed, with which the sludge is moved along the conveying direction, the weight change per unit time can be determined. Although a weight load at any number of positions can be measured, has a
    Measurement at two to four, usually three positions along the conveying direction proved to be advantageous in order to achieve high accuracy with little effort.
    In principle, the weight load can be determined with a wide variety of known sensors. However, it has been shown that a robust and reliable method is achieved if at least one, preferably two to four, in particular three load cells are used to measure the change in weight. Such sensors are cheap and reliable.
    To achieve an optimal flocculant amount, it has been proven that the amount of flocculant with variable step size is changed until a maximum of weight change is reached. Usually, the amount of flocculant in one direction, in the direction of higher or lower flocculant, changed and determined by detecting the change in weight of the sludge and possibly other parameters, an effect of this change. For this purpose, changes in weight are usually stored or temporarily stored, so that a change in weight after a change in the amount of flocculant can be compared with a change in weight before a change in the amount of flocculant. If a change in the amount of flocculant leads to an increase in the weight change, the amount of flocculant is changed again in the same direction and the effect is analyzed again. Only when the change in the amount of flocculant in the same direction causes no increase in the weight change, the flocculant is no longer changed in the same direction. It can then be provided that the amount of flocculant is not changed further. Alternatively, the amount of flocculant may also be changed in a smaller increment in the same direction or in the opposite direction. This may be repeated several times to achieve an operating point at which a maximum weight change or amount of flocculant is present and a change in the amount of flocculant in each direction results in a reduction in the weight change. By changing the step size, on the one hand, a favorable range is quickly reached, so that the process is never operated for a long time in a region with very poor drainage performance. On the other hand, a reduction of the step size close to the optimum operating point allows a precise adjustment of the method to the optimum operating point, wherein a
    Settling takes place with small steps of modification of the flocculant. This also ensures that no major fluctuations occur during operation. Such a regulation, wherein a manipulated variable, here the amount of flocculant, with variable step size is changed taking into account a controlled variable until a maximum of the controlled variable is reached, is also called optimizing iterator.
    It can also be provided that the amount of flocculant is further changed in small steps after reaching the optimum operating point to constantly check whether the optimum operating point has changed and a change in the flocculant in one direction an increase in weight change, which also called dry difference will result in. As a result, operation of the method at an operating point with optimum flocculant amount is possible even under changing operating conditions.
    The further object is achieved in that in a device of the type mentioned a means for detecting a change in weight of befindlichem on the sieve sludge is provided and the flocculant is variable depending on the measured weight change. About the change in weight, the drainage performance of the method is measurable, so that the control of the process can be done reliably. By way of example, the device may comprise one or more force measuring devices which are connected to the screen such that a change in weight of the sludge during dewatering on the screen can be detected. For a stable operation of the device, however, it has proven to be that the screen is designed as a rotating sieve. As a result, dry sludge remains on the screen while water leaving the sludge flows through the screen and is thus separated from the sludge. In a device according to the invention, dehydration is usually gravitational, and not in a vacuum assisted manner. The device is therefore also called Gravity Table.
    In order to be able to use an optical appearance of the sludge for a control, it is favorable if a camera optically detecting the sieve is provided and the amount of flocculant is also changeable depending on an image taken by the camera. In general, the camera is arranged for this purpose above the screen and designed as a digital camera. Typically, electronics are provided for evaluating an image taken with the digital camera to distinguish a mud-covered surface from a non-slurry-coated surface to account for a viscosity of the slurry that is replaceable to control the amount of flocculant.
    Conveniently, at least two, preferably three positions of the screen along the conveying direction force measuring devices are provided which comprise force sensors, in particular load cells, to measure the change in weight of the sludge. This ensures a structurally simple and reliable detection of the change in weight of the sludge. Usually, the force measuring devices are approximately evenly spaced along the conveying direction distributed on the screen to follow the on-screen drainage by detecting the change in weight. If the sieve is designed as a circumferential sieve, it may be expedient for the sieve to be supported at several positions along the conveying direction by the force-measuring devices, so that a load of the sieve can be measured by the force sensors. Normally, in each case a force-measuring device has a sliding plate supporting the sieve, wherein the sliding plate is connected to a substrate supporting the device via a load cell, so that a load on the sieve can be measured by a deformation of the weighing cells. This results in a structurally particularly simple construction. Furthermore, existing systems can thus be easily retrofitted with a weight measurement in order to enable a method according to the invention to be carried out thereon as well.
    Advantageously, a control is provided, with which a flocculant quantity can be changed depending on the measured weight change in different sized steps in order to achieve a maximum change in weight by changing the amount of flocculant. This makes it easy to set an optimal amount of flocculant automatically.
    In particular, when using the device in a sewage treatment plant, in a paper pulper or in a flotation, it has proved favorable if the device has an inlet and at least two separate processes, so that water can be discharged separately from at least partially dried sludge from the device. This ensures a safe separation of water and sludge after drainage.
    Due to the improved drainage performance of the device and the achievable reduction of flocculant, it has proven particularly useful when the inventive device for dewatering sewage sludge or for dewatering a paper pulp is used.
    Further features, advantages and effects of the invention will become apparent from the embodiment illustrated below. In the drawings, to which reference is made, show:
    1 shows a device according to the invention in an isometric view;
    Fig. 2 is a plan view of a device according to the invention;
    FIG. 3 shows a sectional view of a device along the line III-III in FIG. 2; FIG.
    4 shows a further sectional view of a device according to the invention;
    5 and 6 show a detail of a device according to the invention in different views; 7 and 8 are plan views of a device according to the invention.
    Fig. 1 shows schematically an inventive device 1 for dewatering of sludge in isometric view. It can be seen that the device 1 has an inlet 9, through which sludge can be fed continuously to the device 1. From the inlet 9 of the sludge is fed to a Seihtisch. On the Seihtisch a revolving screen 2 is provided, which promotes the mud along a conveying direction 5 on the Seihtisch. As the slurry on the screen 2 is moved along the direction of conveyance 5, the slurry is gravitationally dewatered so that the slurry at one end of the string table is drier and lighter than the slurry at an inlet to the string table. This dewatering takes place under the action of a flocculant previously introduced into the sludge in a flocculant supply device (not shown). The basic amount of flocculant results from the sludge throughput.
    Because optimum dewatering is only possible by a proper choice of a quantity of flocculant added to the sludge, in which neither overflocking nor underflocculation occurs, a regulation for the correct setting of the sludge
    Flocculant provided. In this regulation, a change in weight of the sludge along the conveying direction 5 is a controlled variable. This has been found to be useful because the change in weight of the slurry on the wire 2 substantially indicates the weight of the water leaving the slurry through the wire 2. This weight change is also called dry difference or dewatering difference. A high weight change is thus synonymous with a good drainage performance of the device 1. In addition to the weight change and the sieve speed is in the scheme. When an optimal amount of flocculant is reached, the screen speed is subsequently changed to achieve a further improvement in drainage. Optionally, this can further reduce the amount of flocculant added.
    Next harassment 3 are provided on Seihtisch above the screen 2, which are rigidly connected to the Seihtisch and are flowed around by the mud when it is moved along the conveying direction 5 on the Seihtisch. This is on the one hand appropriate to achieve a good circulation of the mud. On the other hand, based on a flow of the sludge behind the baffles 3 visually also a viscosity can be assessed, which is a measure of optimal flocculation. For optical detection of the sludge, therefore, a digital camera 4 is provided, with which a sludge-covered surface 14 of the screen 2 from a non-sludge-covered surface 15 of the screen 2 is distinguishable. In a preferred embodiment, the viscosity thus determined also enters the control of the amount of flocculant as a controlled variable. Thus, an optimal operating point can be set and maintained.
    To drain the water removed from the sludge, a water outlet 10 is provided on the device 1. Separated from the water outlet 10, a not shown, connected to an outlet of the Seihtisches sludge outlet is provided through which the at least partially dewatered sludge leaves the device 1. i
    Fig. 2 shows the device 1 according to FIG. 1 in a plan view, wherein the baffles 3 and the screen 2 are not shown, which is why below the screen 2 arranged force measuring means 6 can be seen, by which a change in weight of the sludge on the wire 2 along the Conveying direction 5 is measurable. In the illustrated
    Embodiment three force measuring devices 6 are provided. As a result, a change in weight in a first region of the screen 2 and a further change in weight in a second region of the screen 2 can be determined. This has proven to be a good compromise between a high measurement accuracy and a low design effort for producing the device 1.
    The illustrated force measuring devices 6 have sliding plates 8 which support the wire 2 and over which the wire 2 slides. The sliding plates 8 are each connected via a force sensor, in particular a load cell 7, with a substrate or a foundation, so that a weight of the wire 2 is derived at a corresponding position on the slide plate 8 and the force sensor, wherein the force is measured. By difference formation between the individual measured force values can be concluded in a simple manner on a change in weight of the sludge along the conveying direction 5.
    A regulation of the amount of flocculant is usually carried out in such a way that it is regulated to a maximum change in weight. Advantageously, for this purpose, the amount of flocculant in one direction, for example in the direction of higher flocculant, changed and determines an effect of this change on the change in weight of the sludge. If the change in flocculant quantity results in an increase in the weight change, the amount of flocculant is again changed in the same direction until further change in the amount of flocculant in the same direction no longer results in an increase in the change in weight.
    As a result, the amount of flocculant is regulated in each case to an optimal operating point. From this optimal operating point, the controller will normally continue to attempt to change the amount of flocculant, preferably in small increments. If a corresponding change results in a deterioration of the dewatering performance or a reduction in the change in weight, the amount of flocculant is reset to a previous value or changed in the opposite direction. As a result, the method settles quickly even with changing operating conditions to an optimal operating point, with the scheme an optimal flocculant is set.
    Fig. 3 shows a section through an inventive device 1 along the line Ulli! in Fig. 2. It can be seen, the three force measuring devices 6, which support the wire 2, and the rotating screen 2, which is guided by three guide rollers 11 on a substantially triangular path.
    4 shows a detail of the device 1 according to FIG. 3. In this illustration, only the revolving screen 2 together with deflecting rollers 11 and the three force measuring devices 6 are shown, which support the screen 2. In this case, the load cells 7 are shown in the force measuring devices 6. Next, the sliding plates 8 can be seen, which support the wire 2 and on which the wire 2 slides.
    FIGS. 5 and 6 each show one of the force measuring devices 6 according to FIG. 4 in detail in different views. Visible is the sliding plate 8, which is connected via a load cell 7 with a connection part 12 such that a vertical force on the slide plate 8 leads to a bending of the load cell 7 when the force measuring device 6 is mounted on the connection part 12 on a foundation. This has proven to be a very robust form of force measurement. By a small horizontal distance between the connecting part 12 and a bearing point 16, on which the sliding plate 8 is connected to the load cell 7, results in a low bending moment at the connection part 12, so that a high stability is achieved. This small distance is achieved by a first element 18 of the load cell 7 with the connecting part 12 connecting intermediate member 17 which is formed substantially U-shaped. A second end 19 of the load cell 7 is connected as shown at the bearing point 16 with the sliding plate 8, so that a force from the sliding plate 8 via the load cell 7, the intermediate member 17 and the connecting part 12 is transmitted to the foundation.
    FIGS. 7 and 8 show schematically a plan view of a device 1, as can be imaged with a digital camera 4 according to FIG. Here, FIG. 7 shows an operation of the device 1 in an operating point in which the sludge too little flocculant is added, so that the sludge evenly over the screen 2 and in a controlled by the digital camera 4 control area 13 behind the baffles 3 only one mud-covered surface 14 of the screen 2 can be seen. As can be seen, the control area 13 is formed in the embodiment as a rectangle. This geometric
    Shape has proven to be favorable for an assessment of the viscosity, but also other geometric shapes, such as circular or elliptical control areas 13 are possible.
    Fig. 8 shows the same area shown in Fig. 7 at an operating point in which a sufficient amount of flocculant is added to the sludge. In this case, the sludge no longer runs completely behind the baffles 3 in the conveying direction 5, so that a non-sludge-covered surface 15 of the wire 2 can be seen. This is detected by the digital camera 4.
    Preferably, to determine a ratio of a slurry-covered surface 14 to a non-slurry-covered surface 15 of the screen 2, a control region 13 detected pixel by pixel is analyzed 13 by the digital camera 4, and it is discriminated by a color criterion whether the respective pixel is one of the Mud covered surface 14 or a non-mud covered surface 15 represents. Because the size of the non-slurry covered surface 15 of the screen 2 in the control region 13 changes even with small changes in the amount of flocculant, the measurement described above has been proven to determine an operating point in which the slurry has a very favorable viscosity. Furthermore, it has proven to be advantageous if the result of this measurement is received as a controlled variable in a regulation of flocculant.
    With the method according to the invention and the device 1 for this purpose, a drainage of the sludge can be carried out in a simple manner at an optimal operating point, in which neither too much nor too little flocculant is added to the sludge. As a result, on the one hand a high dewatering performance can be achieved. On the other hand, this avoids unnecessary costs for flocculants, so that the method is also particularly economically feasible.
    Furthermore, existing devices 1 for dewatering sludge can also be easily retrofitted with the described force measuring devices 6, a digital camera 4 and a corresponding control, so that optimization is also possible with existing methods or devices 1 and an inventive method is easily implemented. The process according to the invention effects a constant and minimal flocculant dosage and leads to a more homogeneous sludge. This achieves a higher dry content and a lower flocculant consumption. Experiments have shown that with a method according to the invention or a corresponding device 1 compared to conventional methods, a reduction of the flocculant consumption by up to 30% can be achieved.
    权利要求:
    Claims (16)
    [1]
    A method for dewatering sludge, wherein a slurry is added to a defined amount flocculant, after which the sludge is at least partially dewatered, characterized in that a change in weight of the sludge during dewatering of the sludge is measured and the amount of flocculant depending on the measured weight change is set.
    [2]
    2. The method according to claim 1, characterized in that the sludge is moved after admixing of the flocculant with a sieve (2), along a conveying direction (5), wherein at least partially a dehydration takes place.
    [3]
    3. The method according to claim 1 or 2, characterized in that an optical appearance of the sludge is detected during the dewatering and the amount of the flocculant is also changed depending on the optical appearance of the sludge.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the sludge is moved after the admixture of the flocculant with a sieve (2) on at least one baffle (3), wherein the sludge flows around the at least one baffle (3) wherein a ratio of a sludge-covered surface (14) of the screen to a non-sludge-covered surface (15) of the screen in a defined control area (13) behind the at least one baffle (3) is optically detected and the amount of flocculant also depends is changed by this ratio.
    [5]
    5. The method according to claim 4, characterized in that a camera, in particular a digital camera (4) continuously detects the control area (13) and the ratio of sludge-covered surface (14) to non-sludge-covered surface (15) by a Pixel evaluation is determined, preferably using a color criterion between a mud-covered surface (14) and non-sludge-covered surface (15) is distinguished.
    [6]
    6. The method according to any one of claims 2 to 5, characterized in that for measuring the change in weight at least two, preferably three positions along the conveying direction (5) a weight load of the sieve (2) is measured.
    [7]
    7. The method according to any one of claims 1 to 6, characterized in that at least one, preferably two to four, in particular three load cells (7) are used to measure the change in weight.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that the flocculant quantity is varied with variable step size until a maximum of the weight change is reached.
    [9]
    9. Device (1) for dewatering of sludge, in particular for carrying out a method according to one of claims 1 to 8, comprising a Flockungsmittelzuführeinrichtung, with which the sludge a defined amount of flocculant is fed, and a downstream of the flocculant supply screen, wherein the sieve ( 2) is designed for the separation of materials of different consistency and wherein sludge along a conveying direction (5) with the sieve (2) is movable, characterized in that means for detecting a change in weight of the sieve (2) befindliches sludge is provided and the flocculant quantity can be changed depending on the measured weight change.
    [10]
    10. Device (1) according to claim 9, characterized in that the sieve is designed as a peripheral sieve (2).
    [11]
    11. Device (1) according to claim 9 or 10, characterized in that a sieve (2) optically detecting camera (4) is provided and the flocculant amount is also dependent on one of the camera (4) recorded image changeable.
    [12]
    12. Device (1) according to one of claims 9 to 11, characterized in that at least two, preferably three positions of the screen (2) along the conveying direction (5) force measuring means (6) are provided which force sensors, in particular weighing cells (7 ) to measure the weight change of the sludge.
    [13]
    13. Device (1) according to any one of claims 9 to 12, characterized in that a control is provided, with which a flocculant quantity can be changed depending on the measured weight change in different sized steps to achieve a maximum weight change by changing the Flockungsmittelmenge ,
    [14]
    14. Device (1) according to one of claims 9 to 13, characterized in that the device (1) has an inlet (9) and at least two separate processes, so that water separated from at least partially dried sludge from the device (1) dischargeable is.
    [15]
    15. Use of a device (1) according to any one of claims 9 to 14 for dewatering sewage sludge.
    [16]
    16. Use of a device (1) according to any one of claims 9 to 14 for dewatering a paper pulp.
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    DE10043142A1|2001-03-01|Stock inlet control uses pulp density sensors and flow meters to register the pulp condition for comparison with nominal values for deviations to be corrected rapidly by a control circuit
    DE2622988A1|1977-11-24|PROCEDURE AND ARRANGEMENT FOR REGULATING THE SLUDGE WEIGHT OR CONCENTRATION ON SEPARATORS
    同族专利:
    公开号 | 公开日
    AT514909B1|2018-08-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH07110400A|1993-08-19|1995-04-25|Laser Gijutsu Sogo Kenkyusho|Method and device for generating highly bright x ray or gamma ray|
    US20070090060A1|2005-10-21|2007-04-26|Clark John W|Polymer control system|DE102018112083A1|2018-05-18|2019-11-21|Wöllner Gmbh|Device for the treatment of water|JPS57110400A|1980-12-27|1982-07-09|Toshiba Corp|Chemical injection controller|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA763/2013A|AT514909B1|2013-10-03|2013-10-03|Sludge dewatering method and apparatus therefor|ATA763/2013A| AT514909B1|2013-10-03|2013-10-03|Sludge dewatering method and apparatus therefor|
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