DE1912584A1 - Device for treating waste water or the like. - Google Patents

Description

The invention relates generally to the treatment of sewage and in particular the Belüftungsbenandlung of solids relates to waste water containing or other! En liquid ₀

There are already devices for treating wastewater or the like are known, z _o B <> ο from US Patent 2,574,685, these known devices typically include a treatment tank in which a serving for ventilation portion and serving to clarify section are provided " In the aeration section a continuous aeration of the liquid containing solids is carried out in such a way that a sludge is formed. Furthermore, it is ensured that a continuous flow of the liquid carrying the sludge enters the clarification section, in which the sludge can settle. The sludge is returned and mixed with the contents of the aeration section while the liquid above the sludge is withdrawn from the top of the clarification section.

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Generally similar devices for treating wastewater or the like, showing significant improvements represent compared to the device according to the aforementioned UοS.A. patent, are also already known. For example, such improved devices for treating wastewater are disclosed in the IJ.S.A. patents 3 161 590 and 3 195 727 described,

The sewage treatment apparatus of the present invention provides an improvement over all of these already known devices. The main object of the invention is to create a wastewater treatment

™ treatment device that provides a more effective treatment of wastewater enabled with activated mud. The invention also provides a device of the type mentioned, in which the hydraulic movement of the sewage from the aeration section to the clarification section of the tank as well as the return of the sludge to the aeration section can be controlled in a more efficient manner. The invention also provides an improved wastewater treatment device that is simpler than known devices and can be manufactured at lower costs before, which comprises an improved extraction device, by means of which the surface of the liquid in the clearing section is skimmed to the

) floating solids from the clarification section in to redirect the ventilation section.

Generally speaking, the invention provides a "novel manner" clearing section which is used in conjunction with a vent section of substantially known construction. More specifically, is used the area of the clearing section acting as a chamber for absorbing energy through a deflector construction delimited, which is designed so that a uniform distribution of the flow achieved over the entire width of the chamber will. This deflector construction includes inlet slots serving for throttling, by means of which the hydraulic

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Flow from the ventilation section to the clarification outlet cut can be regulated precisely. This flow is generated below the surface of the liquid, so that Only small amounts of foam and light solid substances can get into the energy absorption chamber causes the liquid containing the heavier solids to laminar along a main deflector flows to a point from which it is withdrawn again from the chamber and fed to the ventilation section, that at a return opening due to the in the ventilation section caused the flow course a suction electricity is generated. The flow of the exiting liquid to the outlet weir is also prevented by the deflector arrangement precisely regulated. In a variant of the invention, the clearing section is between the ends of the ventilation section arranged so that an energy absorption chamber faces each half of the ventilation section. In this modified one Embodiment causes the flow course in the Klärungsabs cut and at the ends of the ventilation section as a whole, that the solid entrained by the liquid Substances from the from the clarification section on a common Exit the mouth of this section.

The invention and advantageous details of the invention are shown in the following on -π-and schematic drawings explained in more detail using exemplary embodiments.

Fig. 1 is a vertical longitudinal section through a treatment container according to the invention.

Fig. 2 shows the treatment container according to FIG. 1 in outline

3 shows a modified embodiment of a treatment container in a vertical longitudinal section the invention.

Fig. 4 shows part of the plan of the treatment tank after l * 'ig. 3 «

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Fig «, 5 shows a front view of a first deflector, which in the treatment container according to i * 'ig. 3 and 4 is arranged _e

In Fig. 1 and 2, an inventive container for Treatment of wastewater shown and designated as a whole by 10. The container 10 is made of sheet steel in a known manner or the like and comprises a bottom 12, two similar side walls 13, an end wall 15 arranged at the inlet end and an a: m outlet end arranged End wall 16.

According to Pig. 1 and 2, the container 10 is essentially open at its upper end 20. However, it is also contemplated that the container can be provided with a cover, not shown, during use. The side walls 13 and the end wall 15 at the inlet end are arranged vertically, while the end wall 16 assigned to the outlet end according to S ¹ Ig. 1 is inclined with respect to the container 10 outward.

The container is the solid substances entrained raw water or the liquid in a known manner via a .Pipe 23 supplied. In this way, the wastewater supplied arrives on the end wall 15 on the inlet side into the container 10. The waste water first enters the ventilation section 30 of the container 10, which is defined by the bottom 12, parts of the side walls 13, the end wall 15 at the inlet end of the container and an inwardly inclined partition or deflector 31 is delimited. The deflector 31 is between the Sidewalls 13 of the container 10 are disposed and extend downwardly from the open top end 20 of the container to a lower edge 32 which is arranged at a small distance above the bottom 12 of the container 10.

The partition or deflector 31 comprises an upper portion 40, which in the direction of the end wall 15 at the inlet end of the container 10 is inclined, a substantially

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perpendicular central portion 41 and a lower portion 42 which is generally parallel to the inclined end wall 16 extends at the outlet end and is arranged at a small distance from this end wall, so that it, together with the end wall 16, has an outlet or mouth 46 for the clarifying section 47 of the container 10 which leads to the ventilation section 30. According to Mg. 1, the deflector 51 and the end wall 16 delimit the Outlet end a generally wedge-shaped clearing section 47.

When the supplied wastewater enters the ventilation section 30 of the container 10, it encounters an upwardly rising flow which consists of liquid and air which carry solid substances with it; 1, the air is discharged from an air distributor 50 which extends across the ventilation chamber 30 near the floor 12 and the end wall 15. The air distributor 50 is supplied with the air from an external source in any suitable manner and it gives the supplied air near the end wall 15 to the liquid. The upwardly rising column 51 formed by the air bubbles causes the waste water containing solid substances in the aeration chamber 30 to rotate counterclockwise, as indicated by arrows _{in Mg 0 1.}

While the wastewater flows counterclockwise through the aeration chamber 30, the wastewater being aerated in a known manner so that a sludge is generated, the wastewater stream hits the partition or deflector 31 · The deflector 31 is designed and under such a wall Angled arranged that it causes the sewage to continue its counterclockwise flowing movement in the BeIUftungskammer 30. At the same time, however, rectangular inlet openings 55 in the upper part 40 of the deflector 31, which are distributed at transverse distances, allow an ^x 'part of the wastewater participating in this rotating movement to enter the clarification section via these openings

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transgresses. However, the inlet openings 55 are dimensioned so that they cause a throttling of the flow. According to the invention there is a throttling of the flow in the manner causes the liquid to tend to form a laminar flow when in the clarification section 47 is deflected down along the deflector 31 so that no turbulent flow of the boundary layer is formed. The openings 55 are below the surface L of the sewage arranged to prevent large amounts of foam and light solids from entering the clarification section 47

The speed at which this liquid enters the Clarification section 47 enters is reduced by a second deflector 60, which is arranged in the clarification section and extending between the side walls 13 of the container 10. This second deflector 60 is essentially at the same angle as the end wall 16 at the outlet end with its upper part 61 from the partition 31 inclined away, while a lower part 62 runs essentially parallel to the upper part 40 of the deflector 31. Of the The lower part 62 of the second deflector 60, together with the upper part 40 of the deflector 31, delimits an opening or opening. an inlet 65 · The second deflector 60 thus forms, together with the partition wall 31, an inlet chamber 68 which is connected to the Clarification section 47 is in communication.

The second deflector 60 has the effect not only of reducing the flow rate of the liquid supplied and of the solid substances contained therein, but also of changing the direction of flow. Since the "^ eil 61 of the deflector 60 is inclined away from the incoming waste stream, it causes the wastewater flows initially upwardly so that a uniform distribution of the waste stream is obtained over the whole width of the chamber 68 _e In this way, the flow velocity is further and the air carried by the liquid can easily escape

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Deflector 60 deflected downward so that it flows along the upper part 40 of the deflector 31 through the inlet slot 65. This slowed flow of liquid moves slowly along with the solids it contains Deflector 31 downwards, in the form of a laminar flow, which is primarily due to the initial guiding effect of the second deflector 60, the effect of gravity and a hydraulic "suction" is due to it caused at the mouth 46 by the fact that the liquid passing through the mouth 46 with the waste water flow circulating counterclockwise in the aeration chamber mixes.

The heavier ones entering the cooling section 47 Solids move along this flow path and return via the mouth 46 to the vent section 30 return. At the same time, the liquid located further up is gradually led upwards because of a difference in flow velocity is present because the liquid is at rest in the actual clarification section is located. This water rotates slowly upwards and flows over into the clarification section 47 provided drainage weir 75 »to leave the container 10 after the end of the treatment. Because the inlet ports 5b »are provided on both sides of the clarification section, preventing the laminar flow of the sludge entrained Liquid along both sides of deflector 31 and downward that secondary flows in the transverse direction form that would give rise to the occurrence of turbulence. All of these factors contribute to the settle solids in the clarification section 47 to a maximum extent.

However, not all solid substances are discharged from the clarification section in the manner just described. Some light, buoyant solids rise in the inlet chimney 68 and the actual clarification section 47 up. These floating solids are the

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Ventilation section 30 using one of the "two sections of the container 10 common discharge device 80 fed back.

The discharge device 80 comprises a channel-shaped ^x rog 81 which extends through the partition wall 31 and is arranged essentially at the same level as the surface 1 of the liquid in the container 10 in the middle between the inlet openings 55 of the deflector 31 '. The outer end 82 of the trough 81 is arranged in the ventilation section 30, while its inner end 83 protruded into the clearing section 47

The inlet end 83 of the trough 81 protrudes through a matching opening of the second deflector 60. The side walls

84 of the trough are within the inlet chamber 68 with slots

85 provided. The inner side walls 86 converge near the slots 85 within the trough 81 and extend then again parallel to one another so that they delimit an inner trough 87.

Opposite the open mouth 82 of the trough 81, a plate 90 is arranged directly in the flow path of the wastewater rotating counterclockwise in the ventilation section 30. According to I ¹ Ig. 2, the plate 90 in plan view is wedge-shaped and their ends 91 protrude to both sides over the end 82 of the tray 81 out _o The plate 90 is connected to the trough 81 by a base plate 93 which forms a port setting of the bottom of the trough 81st

Since the sewage moves counterclockwise in its flow in the ventilation section 30 past the wedge-shaped plate 90 of the discharge device, it entrains the ^{liquid located in the x} 'rog 81, so that liquid and light floating solids from the inlet chamber 68 - suctioned through the open slots 85 and the ^1J -'rog 81 and fed to the ventilation section 30. The development of this flow is also supported by the natural action of the fluid,

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through the inlet openings 55 into the inlet chamber 68 flows and thereby pushes the light solids on the surface of the liquid to the central part of the inlet chamber.

At the same time, the light floating solid substances which are in the actual clarifying section 47 are sucked into the trough 87, since a current is generated in this trough. These light floating solids flow through the ^x 'rog 87 and open end 82 of the evacuator to the vent section

It should be noted that the treatment vessel 10 comprises only a small number of components that are simple in construction and can be manufactured at low cost. ^In spite of this, the container according to the invention enables wastewater to be treated with a high degree of efficiency. The flow of the wastewater treated in the aeration section 30 of the container 10 creates a downward flow of the sludge carried by the liquid in the clarification section 47 of the container. This downward flow of the sludge and the fact that the sludge is eventually returned to the aeration section 30 is produced so that the liquid moves steadily and relatively slowly, with pressure surges or the like occurring only to a minimum so that a maximum Efficiency is achieved. The course of the flow causing this effect is achieved by the arrangement of the inlet openings and the second deflector 60. With this arrangement the flow hugs the deflector £ nr due to the Goanda effect, so that it is not necessary to provide a second deflector of great "length" which extended to a very low point in the liquid

In the arrangement according to the invention, a high fluid flow rate of the clarification section 47 is achieved. In the section 47, the solids also settle quickly. Therefore, the wastewater only needs during

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a minimum period of time in the clearing section 47 remain in which the solids settle? This is of considerable importance in the case of arrangements of the type described here that work on a biological basis.

The fact that there is no turbulence where the liquid occurs contributes to this high liquid throughput through the outlet or orifice 46 to enter the aeration chamber 30. The appearance of turbulence is thereby avoided that both liquid flows move in the same direction, and that a reversal the direction of flow is prevented by circulating currents.

In Fig. 3 to 5 is designated a total of 110 Modified embodiment of a container for the treatment of waste water or the like shown. The container 110 is similar to container 10 in that it includes a bottom 112 and side walls 113 of the same shape. He differentiates however, differs from the container 10 in that it has vertically arranged end walls 115 and 115a.

Another difference is the container 110 in that the halves 130 and 130a of the ventilation section are adjacent to the end walls 115 and 115a of the container 10 and are delimited by these walls and corresponding partition walls 131 and 131a. The partitions or deflectors 131 and 131a converge downwards to vertically arranged lower sections 142 which are parallel extend and delimit an outlet or orifice 146 which is located at one between the partitions joint clarification section 147 follows "

The supplied wastewater enters each HSIfte 130 and 120a of the ventilation section in the vicinity of the associated end wall 115 or 115a, where the supplied current occurs meets an upwardly moving stream of liquid that carries solid matter with it and contains air j which becomes air

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from air distributor !! 150 and 150a, which are in each Half of the ventilation section close to the associated one Extending the front wall in the transverse direction «, The sewage flows clockwise in half 130, while it is counterclockwise in half 130a of the ventilation section emotional.

The refrigerant flowing in this way, waste water meets each corresponding partitions or deflectors 131 and 131 whereupon a portion of each of the circulating currents through respective sets of inlet openings 155 and 155a in Figures ¹ bumpers 131 and 131a in the clarification section 147 crossings The inlet openings 155 and 155a have the Same shape and size as the openings 55 described with reference to Fig. 1 and 2. It should be noted, however, that each partition wall 131 and 131a is provided with three such openings, which are distributed over the width of the partition wall at regular intervals. Similar to the container 10, the openings 155 and 1 ^ 5a are arranged at a small distance below the surface L of the waste water.

The speed of the liquid flow entering the clarification section is reduced by similar second deflectors 160 and 160a, which are arranged in the clarification section 147 and extend between the side walls 113. The upper ^<J -'ei "le 161 and 161a of the deflectors are disposed substantially perpendicular, while the lower portions converging 162 and 162a substantially parallel to aen file 131 and 131a extending the deflector. These lower parts 162 and 162a together define inlet slits or mouths 165 and 165a of the same type as deflectors 131 and 131a, which lead from inlet chambers 168 and 168a to the actual clearing section 147.

The supplied streams of solids entrained Liquid is deflected downward by the second deflectors 160 and 160a. Similar to the container 10

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these currents passed through the associated orifices 165 and 165a so that they are in the form of laminar flows along the associated deflectors 131 and 131a in the direction of the outlet 146 stream.

The heavier solids carried along by the liquid flow from the clarification section 147 via the outlet 146 there, v / o the halves 130 and 130a of the ventilation section are connected to one another, to the ventilation section. This flow is caused by the self-weight, the additional effect of the liquid flowing laminarly downwards towards the mouth 146, and the "suction" created at the mouth 146 by the mixing of the sewage streams which are in the halves 130 and 130a of the ventilation section move clockwise and counterclockwise, respectively, while flowing past the lower parts 142 and 142a of deflectors 131 and 131a ₀ It has been shown that these simultaneously occurring forces lead to a flow velocity that is higher than you would you would expect with the described construction of the container 11-0 *

The clearing section 147, as in the first embodiment described above, does not all become solid matter discharged in the manner described, some light and floating solid matter rise in the Inlet chambers 168 and 168a of the two halves of the actual Klärungsabüchnitts 147 upwards. These floating Solid dtoffe is collected through two pairs of evacuators 180 and 180a returned to the halves 130 and 130a of the ventilation section

Since the discharge devices 180 and 180a are of the same construction and operate in the same depth, a description of only one of these devices should suffice. Corresponding J-parts of the discharge devices are 'each with corresponding reference numbers and, if necessary, additionally by the letter a

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draws. Two such discharge devices 180 each protrude between corresponding inlet openings 155 through the first. Deflector 131 and second deflector 160. Each of the assembly comprising _o Abführungsvorricntungen 180 operates substantially in the relation to the discharge device of the container OEO manner described 10th

Each of the discharge devices associated with two sections of the container 110 comprises a channel-shaped structure Trough 181, which extends through the associated partition wall 131 and is substantially level with the Surface L of the liquid in the container 110 is arranged. The outer end 182 of the trough 181 is in half 130 of the ventilation section, while its inner end protruded into the clearing section 147

Each '^' rog 181 stands with the energy absorption chamber 168 via lateral openings 185 in connection. An extension 186 of smaller width than the '■ J-'rog 181 protrudes through a matching opening of the second deflector 160 and opens at 187 in the actual clearing section 147

The outer end 182 of each trough 131 carries directly in ütrömung3weg the rotating sewage in the half 130 of the ventilation section a wedge-shaped plate 190. When the sewage on the wedge-shaped plate 190 of the Discharge device flows past, it entrains liquid from the trough 181 and the trough extension 186, so that liquid and light floating matter from the chamber 168 and thus also from the actual clarification section 147 be sucked off.

The modified container 110 according to FIGS. 3 to 5 has all features of the invention that are also used in the ^ c-containers 10 are provided. However, the container produces 110 an additional one made up of several components Effect, which is apparently due to

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that certain forces act simultaneously in such a way that a completely unexpected and improved one Operation of the arrangement is achieved. The container therefore works with a higher degree of efficiency than the container 10, but it is a little more expensive to produce.

Claims; 00 9 846 / 1Ϊ33

Claims (11)

PATENT CLAIMS Device for oil treatment of waste water or the like, characterized by a treatment tank (10, 110), in which a ventilation section (30, 130, 130a) and a clearing section (47, 147) are provided are, a partition wall (30; 131, 131a), by which the ventilation section in question is separated from the adjacent clearing section, arranged in the ventilation section Devices (50; 150, 150a) for venting the solid ötofxe containing sewage, these devices serve to put the liquid in a rotating motion so that it in the upper part of the container in the direction on the partition in question, then down on one side of the partition and finally in the lower part of the The container flows away from the partition, in which or each Partition wall near the top of the container formed inlet openings (50, 155) through which a portion of the triple moving and hitting the partition wall Sewage can flow to the sewage section, one in the or each clarification section arranged device (60; 160, 160a) through which the inflowing wastewater is directed below, - as well as outlets (46; 146), which in the lower part of the container from the clearing section to the Ventilation stops so "that the solid matter moving down in the clarification section" passes through the outlet pass and get back into the ventilation section. 2. Device according to claim 1, characterized in that the arranged in the clarifying section 009846 / H33 Neten devices each comprise a second deflector (60; 160, i60a) that the "or every second deflector together with the associated partition in the clearing section delimits a chamber serving to absorb energy, that a connection (65; 165, 165a) between the power-receiving chamber (68; 168, 168a) and the remaining ^ express the clarification sabSchnitts is provided, and that this connection is formed by a lower ^lj -'eil of the or each second deflector, of the of the venting portion of fed waste water in Porm directed laminar flow along the partition and down towards the outlet 3. Apparatus according to claim 2, characterized that the outlet (46) through an inclined end wall (16) of the container and a lower part (4-2) the partition wall (31) is delimited so that the lower part of the partition wall is substantially parallel to that adjacent to it inclined end wall extends, and that the rotating sewage flow in the ventilation section (30) at the lower Part of the partition moves past and creates a suction effect such that solid substances carried along by the liquid flow via the outlet to the ventilation section ", 4. Apparatus according to claim 1, characterized in that the inlets several in the or - each Partition wall formed, transversely distributed inlet openings (55; 155, 155a) comprise. 5. Apparatus according to claim 4, characterized in that g e k en η that the inlet openings at a distance below the normal surface (L) of the sewage in the Containers are arranged. 6. Apparatus according to claim 1, characterized in that there is a discharge device (80, 180, 180a) between the or each ventilation section on the one hand and both the energy absorption chamber (68; 168, 168 ') as well as the remaining part of the clarification section 009846/1433. ... ■ (47 5 14-7) extends * 7. The device according to claim 6, characterized in that the or each discharge device comprises a trough (81; 181), the inlet (85; 185) of which is arranged in the energy absorption chamber and the outlet of which is arranged in the ventilation section, and a flow guide device (83, 84}. 186 * 187), which extends from the inlet through the flow ^{guide device (60; 169 »160a) into the remaining x} part of the clarification section. (47j 147) inside
extends » 8. Apparatus according to claim 2 $ characterized by g e k e η η. * that the second deflector is inclined away from the associated partition wall so that it is together with this delimits a generally wedge-shaped energy absorption chamber * 9 ο device according to claim 1j, thereby g e k e η η - draws that the end of the aeration of the sewage Part of the device avoids a first ventilation section forming a first half (130) and a second half (130a) forming a second ventilation system which are arranged in such a way that they deft clarification section (147) flank * 10. The device according to claim 9, characterized geke η η ■ - that the partitions have a first partition or * a first deflector (131) between the clarification section and the first half of the ventilation section and a second partition or «, a second deflector ( 131a)
include between the clearing section and the second half of the ventilation opening * 11. The device according to claim 1, characterized in that the inlet openings a plurality of formed in each of the partition walls * distributed at transverse intervals
Furnishings (1551 .155a) include,. ; . 0 0 9 8 A 8 n% i 3 912584 12, device according to claim 11, characterized in ^N , - • C draws that the inlet openings at. A distance /. · ^ · ' are located below the normal surface of the sewage in the container, _o 13 * Device according to claim 10, characterized in that g · e k e η η ζ eic h η e t that the partitions or the deflectors so converge that they delimit a wedge-shaped clearing section (147) and. to an outlet or a mouth (146) lead, which connects the clarification section near the bottom of the container with the two halves of the ventilation section ο 009846 / U33 ^Λ · ♦ Le e rs e ι te