HU211756B - Apparatous for biological treatment of sludges - Google Patents

Abstract

The essence of the invention is that there are at least two operationally separable components (I, II) each having at least one pre-settler (1) and a post-settler (3) and most preferably two biological cleaning units (2). One post-settler (3) has at least two, preferably four to four, sludge pockets (28). The settling space (12) of the pre-settler (1) is also designed to function as a buffer to dampen the loads resulting from the impulse arrival of the waste water by providing a drainage channel (14) therein, which provides for the delayed flow of waste water. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ X X.

Description

BACKGROUND OF THE INVENTION The present invention relates to a biological wastewater treatment plant which is preferably used for the treatment of smaller amounts (up to 2000 m ³ / day) or of seasonally discharged wastewater from municipalities.

Such features typically include the technological steps for solving wastewater treatment tasks: mechanical pre-treatment stage; followed by a biological step, followed by a post-settling or screening step. For mechanical pre-cleaning, a two-tier sedimentator is often used, which is one of the best-known artworks for wastewater treatment and has a sedimentation space and a sludge storage facility. One advantageous feature is that the sedimented material slides into the digestion space without the use of a dredging device, where it is transformed into excreted sludge in a transportable or deposited state. However, it has the disadvantage that it is extremely sensitive to impulsive masses of wastewater; they disrupt the hydraulic conditions of the settling chamber by flushing the settling material out of the object.

As a biological degree, the so-called. submersible cleaning unit, which is characterized by the fact that bacteria that perform organic decomposition and biological purification settle on a support body. which sometimes goes into the sewage, where it stands out. thus providing the bacteria with food when they are immersed and with oxygen when they rise. The energy requirements of submersible units are significantly lower than those of other biological treatment units. the disadvantage, however, is that the maximum power unit is also limited in size and is limited by the possible geometric dimensions of the rotating submersible.

The dead bacteria are transferred from the immersion unit to the post-sedimentation system together with the biologically treated wastewater, usually in a vertical flow, funnel. called. Dortmund settler. It is also a well-known and well-established art object, and since its settler or sludge adapter is bounded by steeply sloping walls, the settled sludge slides into the sludge sludge by itself. so there is no need for a dredger to move the sludge. A disadvantage, however, is that due to the large slope of the walls, there are quite large art depths. which increases construction costs. To overcome this problem, two- or four-pin artwork solutions have also been developed. which reduces the construction depth. However, it is problematic to remove the same amounts of sludge from different sludges, which is an important prerequisite for a smooth operation.

In addition to the above-described disadvantages of the individual artefacts, there are two major issues with biological wastewater treatment plants for wastewater treatment of 1000 m ³ / d and with seasonal loads. On the one hand, wastewater arrives with very large daily and seasonal fluctuations. on the other hand, at the time of design, the quality characteristics of the actual wastewater produced are generally not known. Attempting to cope with the former problem by taking the projecting peaks into account when designing artefacts results in excessively large volumes of artefacts, and the residence time of the smaller incoming quantities is too long, which is technologically unfavorable. If, on the other hand, they are scaled to smaller quantities, the efficiency of the settler deteriorates during large hydraulic shocks because the flowing water washes out the sludge. This can be counteracted by buffer storage and wastewater metering, which, however, increases installation costs and complicates operation. Concerning the second problem, it should be noted that accurate knowledge of the quality characteristics of wastewater at the time of design would primarily be required when dimensioning the biological stage, and lack of knowledge of this may lead to under- or over-scale, which reduces cleaning efficiency and investment costs.

It is known that in the case of longer power outages in biological sewage treatment plants, the activity of the bacteria is reduced and the bacteria can even be killed. This problem is even more severe for smaller plants (a few thousand m ³ / d capacity), because for economic reasons they do not use double energy supply than large plants. The use of power generators to provide power for smaller installations is also expensive, as they have to be scaled to virtually total power consumption, since the operation of activated sludge systems with fractional energy leads to sludge settling and malfunction. For drip body systems, the diffusion of wastewater to be treated in the drip body systems is also not possible with fractional energy to distribute the wastewater to be treated in the drip body.

It is an object of the present invention to provide a biological wastewater treatment plant that requires low investment and operational (primarily electric power) costs, minimal space, and efficiently and perfectly safe treatment of smaller amounts of wastewater of the order of 1000 m ³ / d. there is a significant fluctuation in the amount of wastewater per season and large irregularities in the daily runoff.

The invention is based on the following recognition:

If the unit has at least two pre-setters and at least two post-setters that are designed for the highest amount of waste water discharged during the year (for example: summer), they can be staggered to provide favorable cleaning technology conditions (for example, in winter) avoiding too long a run-off due to wastewater, etc.), but with the right hydraulic sizing to achieve an artwork season! in the event of a temporary outage, do not completely paralyze the equipment.

It is further recognized that if the geometric characteristics (length, width, height and volume ratio) of pre- and post-setters are

EN 211 756 Β, the unit can be implemented in a block form, which offers the advantage of minimal space requirements and lower construction costs.

We also find it important to realize that by using at least two, preferably three, three biological treatment units for the pre- and post-settling pairs and dimensioning them for a hydraulic load of 50-500 d / m ³ , the biological grade of the sewage treatment plant can in addition, the plant can be economically expanded and cleaning can be economically intensified, particularly when the plant has to be sized for waste water of known quality.

It has also been found that by using a buffer trough, preferably floating, that extends across the entire width of the settling area of the two-tier sedimenter, a settler having a constant removal of sedimented water is provided, which means that the biological stage is uniformly loaded. at the same time, the risk of flushing the sludge tank, thereby removing the sludge to be sludge from the sump space, is eliminated. If said floating drainage trough is able to move up and down while the serrated drainage edge also makes an angular rotation, then, when properly formed, the incoming water will change depending on the position of the floating water (also provided as a buffer). but it produces a variable amount of water in proportion to the varying amount of water.

A further realization is that if a settler is formed with two or rather four bundles and provided. in order to extract the same amount of sludge from each sludge (for recycling), the depth of the sludge can be much smaller than usual, thus its construction is cheaper, and the equal amount of sludge ensures the favorable operation of the sludge hydraulic and wastewater technology. Otherwise, the equality of sludge uptake from the individual sumps can be ensured, for example, by the recirculation lines of the sumps for the post-setters. to transfer the sludge to the common vertical geometric center axis of the sumps, whereby a space separated from the settling area of the post-settler is provided for receiving the recirculation pump. or out of this space is a suction pipe connected to the recirculation pump. If the number of manholes after pre-setters (which divide pre-sedimentation wastewater into biological treatment units) is greater than the number of biological treatment units required by design, it is possible to expand the biological grade and intensify the wastewater treatment process in a simple manner.

If biological purification units are submersible units. and technology, and by providing an engine (motor drive unit) for rotating the submersibles that allows the speed to be set to a value less than the operating speed, the power requirement of the drive can be significantly reduced, without the need to kill or damage the because the submerged body is periodically submerged in the wastewater with the bacteria on it, even if less frequently, but for a longer period of time, this allows for low energy savings at low load and low power (cheap) custom power generator .

Further, if the rotors of the submersibles are so designed that all or part of the rotor can be easily disassembled, anoxic zones can be created within the biological unit, which play a role in the removal of nitrogen contamination of the wastewater. Incidentally, anoxic zones can be created within the submersible units if it is possible to connect the biological units not only in parallel but also in series if the oxygen supply (filler fill, air blasting, etc.) is eliminated.

Finally, it is also important to realize that by controlling the operation of the recirculation pumps (which is not permanently needed) so that they can only be transported when the unit receives an average or smaller amount of wastewater, we can eliminate or at least significantly reduce the the harmful effects of loads (peaks) on technology.

Based on the above findings, the object of the present invention has been solved by a wastewater treatment plant having a pre-settler, a biological purification unit and a post-settler comprising a settling area and a sludge storage tank, and for feeding raw wastewater, removing the purified wastewater and means for serving, characterized in that the apparatus comprises at least two operably separable components, each comprising at least one pre-settler and post-settler, and at least two biological cleaning units; each post-settler having at least two preferably four to four sludge sumps, and the pre-settling sump space also serving as a buffer space for dampening the loads resulting from the impulsive arrival of the effluent by modifying the drainage trough therein. Preferably, the components have a common manifold, which is inserted between their pre-setters and is operatively connected to them by means of openings and closures. Biological purification units should preferably be submersible biological units. In a preferred embodiment of the apparatus, a manhole is inserted between the biological purification units and the associated pre-setters. In this case, it is expedient. if the manhole has a larger manhole and several associated mineshells, and the conduit to the pre-settler ends into the common manhole, and the smaller manholes are provided with additional wires, each with a biological cleaning unit

EN 211 756 Β and if the manhole has more smaller manholes than the number of biological cleaning units the manifold has.

According to another aspect of the invention, the motor drive units for rotating the submersibles of the submersible units are of variable speed - devices for adjusting the submersibles to a speed lower than the operating speed.

The biological cleaning units can be connected to the pre-settler either in parallel or in series.

A preferred embodiment of the apparatus according to the invention is a level switch located in the buffer region of the settling space of the two-stage pre-settler and operating in conjunction with a recirculation pump for the post-settler by stopping its operation by saturating the buffer space with sewage.

Another embodiment of the apparatus is typical. that a central central space is formed in the post-settler, which is obstructed from the rest of the post-settler space; the common recirculation pump is located in this central space, or the pump suction pipe extends into this central space, which is connected to the sludge sumps by sludge inlet pipes; and the sludge sludges are hydraulically spaced from the recirculation pump.

An embodiment of the apparatus is also preferred. characterized in that the drainage trough is connected up and down to allow its float to be connected to rods hinged in the region of its outer end, a float body, preferably an air reservoir, and adjustable means for adjusting and relieving load, preferably tanks. and the device has stops for lowering and uppering the trough movement. The rods are connected to the trough either hingedly or rigidly, and thus angularly rotated as the trough leading edge moves up and down. Alternatively, the trough is fixed and has holes in the lower part of its masonry, preferably in its bottom, preferably in an inclined portion thereof, and in line with one another. Preferably the width of the trough is equal to or approximately the width of the settling space of the pre-settler. Usually the trough has a notched buck.

The invention will now be described in more detail with reference to the accompanying drawings, which illustrate embodiments of the device and some structural details. 1 is a schematic top view of an embodiment of the apparatus;

Figure 2 is a schematic top plan view of another embodiment of the apparatus;

3a. Figure 2 is a sectional view taken along the line A-A in Figure 2;

3b. 3a. Fig. 4 is a sectional view taken along the line B-B in Fig. 4B;

4a. 3a. Figure 4b is a larger scale view of the drainage trough shown in Figure 4b. Fig. 6 is a sectional view taken along the line C-C in Fig. 4A;

4b. 4a. Fig. 6 is a sectional view taken along the line D-D in Fig. 4A;

FIG. FIG. 2A is a perspective view of another embodiment of a drain trough; FIG.

Figure 6 shows the drainage trough of Figure 5 in a larger scale and in its lower and upper end positions;

6a. Figure 6 is a view of a portion of the drain trough of Figure 6, viewed in the direction of arrow E in Figure 6;

6b. 6a. FIG. 6 is a view similar to FIG. 6 but viewed from the direction of arrow F in FIG. 6;

6c. Fig. 2A is a vertical sectional view of another embodiment of the drainage trough;

7a. Figure 1 is a top plan view of one of the post-settlers of the apparatus of Figure 1. shown in more detail;

7b. 7a. Fig. 6 is a sectional view taken along the line Y-Y in Fig. 4A;

8a. 7a. Fig. 6 is a sectional view taken along the line Z-Z in Fig. 2B;

8b. and 8c. Figures 8a and 8b show a recirculation pump; Figure 3B shows similar but different placement possibilities.

The apparatus of Fig. 1 has two sub-assemblies I, II, which are symmetrical with respect to the vertical geometric center plane X. For each of the components I, II there is one two-level pre-settler 1. one with 3 post-sedimentation units and three with three biological purification units 2. Between the pre-setters 1 and the biological purification units 2 there are inserted manholes 4 or manhole rows 4, i.e. the partially purified water from the pre-settler 1 first enters a common shaft space through line 6a and from there into smaller shaft spaces arranged side by side. and from these smaller manholes the water is delivered in equal or substantially equal amounts to the three biological treatment units 2. Each of the solutions of FIG. 1 and FIG. 2 has more than two biological treatment units with a smaller manhole space, which at a later date provides an opportunity to expand the biological grade by adding a new biological treatment unit and thus simply intensifying wastewater treatment.

The feed 5 is used for feeding the raw sewage to be purified, and the direction of the feed is indicated by an arrow drawn on the feed. The pre-setters 1 are connected by a conduit 6a to the manholes 4 which are used for discharging the sedimented waste water. Wires 6b exit from the shaft (s) and flow into the biological cleaning units (2). Pipes 7 are used for conveying water exiting therefrom to the post-settlers 3. Purified sewage is discharged from the plant via a conduit 8 leaving the post-settler 3. 5-8. arrows drawn on the lines indicate the direction of the fluid flow.

The apparatus of FIG. 2 is from that of FIG

Since the position of the pre-setters 1 is the same in both embodiments, the reference numbers in Figure 1 are applied mutatis mutandis to Figure 2.

3a. and 3b. 1 to 4, the pre-settler 1 is shown on a larger scale. In the 9 receiving and distribution shafts (see fig

1 and 2) extends from the above-mentioned conduit 5 and an opening 9a is formed in the shaft portion through which the interior space of the receiving and dividing shaft 9 travels with the settling space 12 of the two-level pre-settler 1. Below the sedimentation space 12 is the sludge digestion storage space 12 which is bounded by the side wall 11. A closing assembly 10 is provided for opening and closing the opening 9a (Fig. 3a). (Note that the receiving and dividing shafts 9 are a common artwork of the components of Figures 1 and 2, so that Figure 3a shows two closure fittings 10, the left one for component I and the right for component II.) in the settling space, in the region of its end opposite the receiving and distribution shafts 9, a floating drainage trough 14 (Fig. 3a) is located, which can move up and down between the upper end position indicated by a drawn line and the lower end position indicated by dashed lines. the settling chamber 12 may have a minimum water level 15 and a maximum water level 16, or the water level may fluctuate between the minimum and maximum water levels 15 and 16. The length of the trough 14 is substantially the same as the width j of the settling chamber 12 (Fig. 3b). The length of the settling space 12 is shown in Fig. 3a. The distance between the extreme values of the water level fluctuation is denoted by //. 3b. Figure 12 ülepítőtérben fluid space cross-section in the lowest (minimum) water level indicated by the oblique line shading Fj reference letter, while the corresponding liquid volume between the upper level 16 and lower 15 horizontal transverse cross-hatching and reference letter F _2. It is readily apparent that the product of the settling space / length 12 and the F ₂ cross section (in other words the / x 5 x H values) gives the aforementioned buffer capacity of the unit, which allows the reduction of short, protruding sewage load peaks.

4a. 4b. 3a. A preferred embodiment of the floating drain trough 14 of FIG. The trough 14 is provided with a float 17 (e.g., a hollow body) attached to its bottom and externally and is hinged to the other end of the rod (arm) 19 connected to one end of the geometric axis of rotation 18 (see also Fig. 3a). (In fact, it is advisable to use two rods 19 at each end of the trough 14, which may be mounted on a common shaft or mounted on two separate bearings 18a, as shown in Fig. 4b.) there are two (two-piece) regulator-adjusting tanks 21 which are partly air tanks and partly heavy (load). The up and down movement of the floating drain troughs 14 is limited by the lower and upper stops 22, 23. 4a, 4b. In the exemplary embodiment of the price, the toothed roll 24 is formed. 3a, 4a, 4b. 1 to 2, which is formed here as a flexible pipe to follow the upward and downward movement of the trough 14.

The embodiment of the trough 14 according to Figures 5 and 6 is shown in Figures 4a, 4b. 9a, the rods (arms) are connected to the trough 14 by a rigid connection (e.g., by welding anchoring ribs 25); in Figure 5, reference numerals and symbols used previously are applied mutatis mutandis.

6a. 6b and 6b. FIGS. 6A and 4B show the flow conditions of the trough 14 for the highest and deepest trough positions according to FIG. 6; we will return to the detailed description of these figures when describing the operation of the apparatus.

7a., 7b. 8a and 8a. 1 to 2, which, like the other post-settlers, has four sludge sumps 28 and each sludge 28 has a sludge transfer (feed and feed) line 29 extending through the sludge transfer 3. The central portion 30 is formed in a central geometric central axis of k, the upper portion of which is closed by a cover 31 fitting to the oblique walls of the sumps 28. The conduit 7 for feeding the biologically treated wastewater flows into a bottom-open cylindrical chamber 38 located above the vertical geometric center axis of the settler 3 and the conduit 8 for discharging the purified wastewater out of the trough 39 it is circumferentially located above the inside of the side walls of the post-settler. 8a8c. In Figures 1 to 4, it is clearly seen that a baffle 32 is located at the bottom of the central space 30, the cone angle of which is selected with respect to the angle of insertion of the bushings 29 in a vertical plane. A recirculation pump 33 is provided for extracting sludge from the central space 30, preferably a submersible pump. The pump 33 is shown in FIG. 8b in the central space 30 itself, FIG. 8c in the chamber 38, FIG. and in the pump housing 36 outside the artwork. In each case, a discharge line 34 is connected to the pump 33; and 8c. In addition, the suction line 35 extends into the central space 30 in the embodiments of FIGS. Depending on the arrangement, a winding rope 37 is also attached to the cover 31 (Fig. 8a) or to the pump 33 (Figs. 8b and 8c).

The equipment described above is operated as follows (the flow direction of the liquid is indicated by arrows in the system):

the raw wastewater to be cleaned enters via the pipe 5 into the receiving and distribution shaft 9 of the plant pre-settler 1, which is provided with two closing fittings 10 (Fig. 3a). Depending on whether only one or both of the shut-off valves 10 are open, the waste water flows into either the pre-settler 1 of one of the components I, II, or both. If the daily load is low (for example, at a waterfront holiday resort in the winter5)

EN 211 756 Β ban), the waste water shall be treated in accordance with Figure 3a. As shown in Figures 1 to 4, it flows only into unit I of the apparatus and flows through the settling space 12 of the associated pre-settler 1. The sludge settled during the flow is shown in Fig. 3b. 4 through 4 slots 40, as is known per se, slip into the digestion space 13 of the two-storey pre-settler 1 and the pre-settled water into the drain trough 14 and from there through the line 6a to the manhole 4. When no sewage is received, the float 17 of the trough 14 rests on the lower stops 22. The lower resting water level 15 is determined by the lowest points of the triangular notches 31 of the toothed rails 24. At this time, the settling space 12 is provided with the 3b. Figure 1 shows the volume of waste water having a cross-sectional designation F \. As the amount of incoming water increases, the drop height also increases and, when the load is adjustable by the load placed in the compartments of the regulator tank (air reservoir) 21 (shown in Figures 4a, 4b and 6), the trough 14 4a, 4b, it floats by means of a controlled buoyancy by means of the regulator-adjusting tanks 21, and from that time on, the trough 14 also discharges a constant amount of water. In the example of Fig. 4a, the amount of water depends on the number of notches 31 of the toothed rake 24 and the aforementioned height of breakage h (which is indicated only in Fig. 6, but also in Fig. 4a and 4b), or increases as the water level increases, as in the case of Figures 5 and 6. The water level above the minimum water level at height h is shown in Fig. 6b. 15A. The largest cross-section of a body of water flowing through a tooth 41 is then illustrated by the hatched area 26 (Fig. 6b): the incoming water is greater than the discharge. If the amount of waste water arriving is greater than the discharge, the height H of the water to the upper water level 16 defined by the upper stop 23 (AH is also indicated in Figures 3b, 4a, 4b). water by weight of f + F _z cross-section of Figure flows through, i.e. the amount of water increases the puffertérfogattal and therefore the residence (settling) time is reduced to the incoming water quantity linearly, however, the buffering capacity makes it possible to reduce the short spikes. Thus, the solution described above prevents overloading of both the pre-sedimentation unit and the subsequent technological units in a simple manner. or shock loads. As mentioned above, the buffer volume is F ₂ x 1 (the value of l, i.e. the length of the sedimentation space 12, is denoted in Fig. 3a, and in Fig. 3a, the width of the sedimentation space 12 is denoted by s).

If the drainage of the sedimented waste water is carried out according to Figs. 4a, 4b. 2, the toothed tumbler 24 (tipping edge) of the trough 14 maintains the position of the float 17 or the regulating tank 21 (air tank) at any water level, such as the lower and upper 15 and 16 the same amount of water at each drop height h between water levels. However, if the trough 14 is configured as shown in Figures 5 and 6, i.e. the arms 19 are rigidly connected to the trough 14, the vertical angle α of the toothed tumbler plate at an elevated water level starting from 0 ° (see Figure 6). lower part) increases, so that the tipping body of water is shown in Fig. 6a. 6b in the upper position 41 of the trough 14 is shown in FIGS. 5A, and, of course, each of the flow cross-sections between the cross-sections 26 and 27 is greater than the cross-section 26 in each cut. The increase is due to the height h increasing to b and b = h / cos a; that angle is indicated in Figure 6. It is easy to calculate that for a 90'bile plate the cross section 27 for α = 35 'is 50% larger than the cross section 26 for α = 0'. The cross-sectional increase depends on the reciprocal of the cosine of the α value. 5 and 6 can be advantageous in particular if the amount of water entering the system fluctuates particularly strongly over time, because by choosing the change of angle α (the rotation of the lever 19) the waste water peaks are favorably damped and the hydraulic load under optimal conditions. The required angle α (Fig. 6) can be determined by taking into account the height H, the size c of the arm 19 (Fig. 5) and the angle β (Figs. 5 and 6), respectively.

Note that the buffer volume is shown in Fig. 6c. can also be provided by the solution shown in FIG. In this case, the portion 42a of the bottom 42 of the trough, which is aligned with the side wall 11 of the settling chamber 12, has holes 43a and the height H of the buffer space extends from the line of holes formed by these 43 holes to the tilt edge of the wall 45. the length of the sedimentation space la 12 (Fig. 3a) and the width of the sedimentation space 5 (Fig. 3b). In front of the trough 14 is a submersible wall 44 extending, as well as the trough 14, over the entire width of the settling chamber 12. A level switch 47 is mounted in the buffer space, which controls the operation of the recirculation pumps 33 mentioned above and associated with the post-settler 3 such that when the waste water, for example at a load peak, fills the buffer space, the level switch 47 stops recirculation pump 30. sludge recirculation should not further increase it.

7a-7b. and Figures 8a-8c. Figures 1 to 5 show clearly that in this embodiment of the device according to the invention there are so-called. "Dortmund" post-setters are used, in which the sediment sludge slides down the oblique walls into four sludge sludges 28. 7b. It can be readily seen from Figures 1 to 4 that if the post-settler 3 had only one slurry sludge 28, the depth of the artwork would be Λ /, (this imaginary artwork was drawn in dashed lines). By applying the four sludge sludges 28, the depth of the object is reduced to M. The uniform sludge uptake from the four sludge sumps 28 is ensured by the fact that the pump located in the central space 30

It is located at a distance of four sludge sumps 28 from the four sludge sumps, and since sludge drainage ducts are of the same length, said distances are hydraulically the same. Thus, a suction is induced in the central space 30 by actuation of the pump 33 (either by the central pump itself or, in the case of the solutions of Figures 8b, 8c, by its suction line 35), and since the central space 30 is closed a pressure drop from the post-settler space 3 in the central space 30 causes the sludge sludge 28 to start sludge flow through the pressure line 34. Because the pipes have the same geometry and the suction-producing pump or suction 33 is located in the vertical geometric centerline of the central space 30, an equal amount of sludge is emitted from each sludge sludge 28 per unit time. One of the functions of the baffle cone 32 at the bottom of the central space is to provide better flow, but it also plays a role. that the sludge conductor inlet pipes 29 may be cleaned from the top of the artwork. The cover 31, the associated recirculation pump 33, and the suction tube 35 may be removed by the winding cord 37 (Figures 8a-8c). Of course, when determining the dimensions, it should be taken into account that: - d,> d ₃ > d ₂ must be met.

Advantageous effects of the invention may be summarized as follows:

the greatest advantage of the equipment is that it can be used very favorably in settlements with high fluctuations in the amount of wastewater discharged per season and large inequalities in the daily runoff, as it assures dampening of the loads caused by the surge of wastewater.

Another advantage is that they are in a bulk construction. and central sludge suction can significantly reduce construction costs. It is also an advantageous factor that if the biological degree of immersion body technology or units is chosen, the equipment can be operated in an extremely energy-efficient manner, the operational safety of which can be guaranteed by a low-power generator, technology can easily be intensified and performance can be increased. Finally, it is advantageous that the device is easy to operate. it has a reliable plant, and sludge placement is easier than raw sludge from other technologies.

Claims (17)

PATENT CLAIMS A biological wastewater treatment plant having a pre-settler comprising a sedimentation space and a sludge digester. having a biological purification unit and a post-settler, and having means for feeding raw wastewater, for removing purified wastewater and for removing sedimented sludge, characterized in that it has at least two functionally separable subassemblies (I, II), each of which has at least one - comprising a pre-settler (1) and a post-settler (3) and at least two biological purification units (2); each of the post-settlers (3) having at least two, preferably four to four sludge sludges (28), and the settling space (12) of the pre-settling (1) being formed by a drainage trough (14) for delayed discharge of the waste water is also designed to function as a buffer space that allows for the attenuation of the resulting loads. Apparatus according to Claim 1, characterized in that the components (I, II) have a common receiving and distribution shaft (9) inserted between their pre-setters (1) and with them openings (9a) and shaker assemblies (10). through an operational relationship. Apparatus according to claim 1 or 2, characterized in that the biological purification units (2) are made of immersed biological units. 4. Apparatus according to any one of claims 1 to 3, characterized in that a manhole (4) is inserted between the biological purification units (2) and the associated pre-settling unit (1). Apparatus according to claim 4, characterized in that the manhole (4) has a larger manhole and a plurality of smaller manholes associated therewith, and a conduit (6a) connected to the pre-settler (1) extends into the common manhole and has smaller manholes. by additional wires (6b) separately connected to a biological purification unit (2). 6. Apparatus according to claim 5, characterized in that the manhole (4) has a plurality of smaller manholes than the number of biological cleaning units (2) provided by the manifold subassembly (I, II). 7. Device according to any one of claims 1 to 3, characterized in that the motor drive units for rotating the submersible bodies of the submersible assemblies are variable speed devices capable of adjusting the submersibles to a lower speed than the operating speed. 8. Apparatus according to any one of claims 1 to 4, characterized in that the biological cleaning units (2) are connected in parallel to the pre-settler (1). 9. Device according to any one of claims 1 to 3, characterized in that the biological cleaning units (2) are connected in series to the pre-settling unit (1). 10. Apparatus according to any one of claims 1 to 5, characterized in that a level switch (47) operatively connected to the recirculation pump (33) for the post-settler (3) is located in the buffer area of the settling space (12) of the two-stage pre-settler. 11. Apparatus according to any one of claims 1 to 3, characterized in that the post-settler (3) is provided with a central central space (30) enclosed by a cover (31) from the rest of the post-settler space; the common recirculation pump (33) is located in this central space (30), or the suction pipe of the pump (33) extends into this central space (30), which is connected to the sludge sumps (28) and the sludge sumps (28) a recir7 EN 211 756 Β from the coulter pump (33) in the hydraulic sense. 12. Apparatus according to any one of claims 1 to 4, characterized in that the drain trough (14) is connected to the rods (19) hinged at the outer end region hinged (18a), allowing a float body (17) to be floatable on the lower part of the trough (14). and loading and unloading rule ozone adjusting means, preferably containers (21), are attached to its sides, and the device has stops (22, 23) for lowering and lowering the upward and downward movement of the trough (14). Apparatus according to claim 12, characterized in that the rods (19) are hinged (20) to the trough (14). Apparatus according to claim 12, characterized in that the rods (19) are connected to the trough by a rigid connection, and in this way an angular rotation is provided during the upward and downward movement of the trough (14). 15. A 12-14. Apparatus according to any one of claims 1 to 4, characterized in that the trough (14) is fixed and has holes (43) in a line in the lower part of its masonry, preferably in its bottom (42), preferably in its oblique section (42a). 16. Apparatus according to any one of claims 1 to 4, characterized in that the width of the trough (14) is equal to or approximately the width (s) of the settling space (12) of the pre-settler (1). 17. A 12-16. Device according to any one of claims 1 to 3, characterized in that the trough (14) has a toothed tilt (24).