Cleaning system, settling tanks and wastewater treatment plant

Abstract

Cleaning system (100) for a wastewater treatment plant with a settling tank (102), with at least one cleaning nozzle (104) which, in its intended use, is directed towards a partition plate (106) in the settling tank (102), and with a high-pressure pump (108) fluidically connected to the cleaning nozzle (104) for the supply of water and / or a cleaning agent, wherein the cleaning nozzle (104) is attached to a bracket (110) adjustable along a trajectory, and wherein the trajectory corresponds to a course of the partition plate (106) in the settling tank (102).

Description

[0001] The invention relates to a cleaning system, a clarifier, and a sewage treatment plant. A clarifier is part of a sewage treatment plant. Clarifiers comprise primary clarifiers and secondary clarifiers. In both tanks, the water comes to rest, allowing solids to settle and be separated from the purified water. In the primary clarifier, coarse dirt sinks to the bottom and can then be pumped out. In the secondary clarifier, the activated sludge is separated from the water. The activated sludge contains microorganisms that break down pollutants in the water. During clarification, the activated sludge settles to the bottom of the secondary clarifier. The purified water flows over a baffle in both clarifiers, is monitored by measurements, and then passed on. Due to the water overflowing at the baffle, deposits and / or algae growth regularly form there.This causes pieces of these deposits and / or algae growth to break off and block or cover measuring points located downstream of the baffle. This prevents measurement of the purified water or reduces the measurement quality.

[0002] In conventional wastewater treatment plants or clarifiers, the separating plate is cleaned using a rotating brush. However, this often results in parts of the deposits and / or algae growth being torn off, blocking or covering the sensor location. Furthermore, cleaning with a brush is often insufficient, meaning that deposits and / or algae growth are sometimes not removed, or multiple cleaning processes are required before an acceptable result is achieved.

[0003] The object of the invention is therefore to provide an efficient cleaning system for a sewage treatment plant with a settling tank, which performs proper cleaning so that measuring points are not covered by deposits and / or algae growth. Furthermore, the object is to provide a settling tank and a sewage treatment plant with a corresponding cleaning system.

[0004] The object is achieved by a cleaning system having the features of claim 1, by a clarifier having the features of claim 14, and by a sewage treatment plant having the features of claim 15. Advantageous embodiments with expedient further developments of the invention are specified in the dependent claims.

[0005] The cleaning system according to the invention for a wastewater treatment plant with a settling tank comprises at least one cleaning nozzle, which, during intended use, is directed toward a separating plate in the settling tank. Furthermore, the cleaning system comprises a high-pressure pump fluidically connected to the cleaning nozzle for supplying water and / or a cleaning agent. The cleaning nozzle is attached to a holder adjustable along a trajectory, and the trajectory corresponds to a path of the separating plate in the settling tank. Thus, a cleaning system is provided in which the deposits and / or algae growth on the separating plate are reliably removed and destroyed by high-pressure cleaning, or comminuted in such a way that the measuring point is not blocked, concealed, or contaminated.

[0006] Preferably, a drive is provided that is operatively connected to the holder, allowing the holder to be adjusted by means of the drive. This allows the cleaning process to be automated.

[0007] It is advantageously provided that the bracket is attached to a pivoting arm that can rotate about a rotational axis, and the pivoting arm is adjustable by the drive. This allows the cleaning system to be easily integrated into existing clarification tanks.

[0008] In one embodiment of the invention, a control device is provided that is configured to control the drive and the high-pressure pump. This allows the cleaning system to operate fully automatically, allowing adjustment of pressure, feed rate, and a cleaning program, for example.

[0009] Preferably, the cleaning nozzle is directed toward an edge of the baffle that protrudes at least partially above the liquid present in the clarifier. This ensures that the cleaning nozzle is directed toward the area where the most deposits and / or algae growth typically occur on the baffle.

[0010] In one embodiment of the invention, at least two cleaning nozzles are provided. This allows two locations on the separating plate to be cleaned simultaneously, with a single high-pressure pump being provided that applies pressure to all of the cleaning nozzles.

[0011] In one embodiment of the invention, at least three cleaning nozzles are provided. This allows three locations on the separating plate to be cleaned simultaneously. In this case, too, it is preferably provided that the single high-pressure pump applies pressure to all of the cleaning nozzles.

[0012] It is advantageously provided that a first cleaning nozzle is directed toward a surface of the separating plate facing inward relative to the clarifier. In this way, the first cleaning nozzle is directed toward the area of ​​the separating plate where deposits and / or algae growth quickly accumulate during normal use.

[0013] In one embodiment of the invention, a second cleaning nozzle is directed toward a surface of the separating plate facing outward relative to the clarifier. Thus, the second cleaning nozzle is directed toward a location where deposits and / or algal growth also quickly form.

[0014] Preferably, the separating plate forms one leg of a channel running along one edge of the clarifier, with a third cleaning nozzle directed toward a second leg of the channel. In this way, the entire separating plate is cleaned.

[0015] In one embodiment of the invention, a fourth cleaning nozzle is directed at a sheet metal guard located in the clarifier. This also cleans the sheet metal guard by the cleaning system and removes deposits and algae growth. The fourth cleaning nozzle is also pressurized by the single high-pressure pump.

[0016] It is advantageously provided that a sieve is attached to the holder and is adjustable within the channel formed by the separating plate. In this way, the sieve captures the pieces of deposits and / or algae growth that could not be properly destroyed or shredded during the high-pressure cleaning process.

[0017] Preferably, the orientation of one of the cleaning nozzle's nozzle heads is adjustable. This allows the nozzle heads to be precisely aligned so that they are directed at the desired location. If a suitable actuator is available, the nozzle heads can even be adjusted during operation.

[0018] A clarifier according to the invention comprises the purification system according to the invention. A wastewater treatment plant according to the invention accordingly comprises the clarifier according to the invention with the purification system according to the invention. The advantages, advantageous configurations, and effects mentioned above in connection with the purification system thus also apply to the clarifier according to the invention and to the wastewater treatment plant according to the invention.

[0019] The features and feature combinations mentioned above in the description, as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the invention. Thus, embodiments are also to be considered encompassed and disclosed by the invention that are not explicitly shown or explained in the figures, but which emerge and can be produced from the explained embodiments through separate feature combinations.

[0020] Further advantages, features, and details of the invention will become apparent from the claims, the following description of preferred embodiments, and the drawings. These show: Fig. 1 a schematic sectional view of a clarifier with a first embodiment of the cleaning system with four cleaning nozzles, Fig. 2 a simplified schematic plan view of the clarifier from Fig. 1, and Fig. 3 a perspective view of the free end of the holder of a second embodiment of the cleaning system, to which three of the cleaning nozzles are attached.

[0021] Fig. 1 shows a cleaning system 100 of a clarifier 102, which is part of a sewage treatment plant not shown in detail.

[0022] The clarification tank 102 has a tank edge 126 and is formed as a round tank in the embodiment shown, as well as in Fig. 2. However, it is also possible for the settling tank 102 to be formed as a rectangular tank. A liquid 120 is present in the settling tank 102, which, in its intended use, is a settling liquid, i.e., a mixture of water and sludge.

[0023] In the clarification tank 102, a separating plate 106 is arranged on the inner circumference of the tank edge 126, which comprises two legs 130, 131 and a bottom 137 and essentially forms a channel 128 running along the tank edge 126. Therefore, in the embodiment shown, the separating plate 106 has a ring shape in a plan view, which in Fig. 2. The separating plate 106 is positioned in the settling tank 102 such that it protrudes at least partially from the liquid 120. In other words, the edge 118 protrudes from the liquid 120 present in the settling tank 102. The surface of the liquid 120 is illustrated by dotted lines. In the embodiment shown, a pre-plate 132 is arranged on the inner circumference of the separating plate 106, which includes a further base 138 and a single leg.

[0024] Connected to the channel 128, which is formed by the separating plate 106, is a channel in which a measuring point S is arranged. Various sensors are arranged at the measuring point S, for example, to determine the properties or purity of the purified liquid 120.

[0025] Furthermore, a drive 112 is provided, which in the embodiment shown is arranged on a block in the center of the settling tank 102. However, the drive can also be arranged outside the settling tank 102 or at the tank edge 126 and can be designed, for example, as a motor. The drive 112 is also operatively connected to a pivot arm 114 and can adjust it in rotation about the rotation axis A. A bracket 110 is attached to the outward-facing end region of the pivot arm 114 in the area above the partition plate 106.

[0026] Alternatively, it is possible for the holder 110 to be attached to a drive 112 which is arranged on the pool edge 126 and moves along the pool edge 126.

[0027] In Fig. 1 it can be seen that four cleaning nozzles 104 are arranged on the holder 110, each having a nozzle head 136.

[0028] The cleaning nozzles 104 are fluidically connected to a high-pressure pump 108, which delivers water and / or cleaning agent under high pressure, e.g., 100 to 150 bar, to the nozzle heads 136. In the illustrated embodiment, the high-pressure pump 108 is arranged on the bracket 110. However, the high-pressure pump 108 can also be arranged outside the clarifier 102 or at the edge 126 of the clarifier 102, or inside the clarifier 102, e.g., on the block in the center of the clarifier 102.

[0029] In Fig. 3 or in Fig. 1 shows that a first cleaning nozzle 104, 104a is directed toward a surface 122 of the partition plate 106 facing inward relative to the clarifier 102. The nozzle head 136 of the first cleaning nozzle 104, 104a is oriented such that the edge 118 of the partition plate 106 and the inward-facing surface 122 of the partition plate 106 are contacted by water and / or cleaning agent sprayed from the cleaning nozzle 104, 104a.

[0030] A second cleaning nozzle 104, 104b is directed toward a surface 124 of the partition plate 106 facing outward relative to the clarifier 102. The nozzle head 136 of the second cleaning nozzle 104, 104b is oriented such that the edge 118 of the partition plate 106 and the outward-facing surface 122 of the partition plate 106 are contacted by water and / or cleaning agent sprayed from the cleaning nozzle 104, 104b.

[0031] A third cleaning nozzle 104, 104c is directed toward a second leg 131 of the channel 128, which is directed outward relative to the clarifier 102. The nozzle head 136 of the third cleaning nozzle 104, 104c is oriented such that the upper edge of the second leg 131 and the inward surface of the second leg 131 are contacted by water and / or cleaning agent sprayed from the cleaning nozzle 104, 104c.

[0032] In Fig.1. It can be seen that a fourth cleaning nozzle 104, 104d is directed at the sheet metal preform 132. The nozzle head 136 of the fourth cleaning nozzle 104, 104d is oriented such that the upper edge of the sheet metal preform 132 and the outwardly facing surface of the sheet metal preform 132 are captured by the water and / or cleaning agent sprayed from the cleaning nozzle 104, 104d.

[0033] However, it is also possible to adjust the orientation of the nozzle heads 136 so that other areas are covered by the sprayed water and / or cleaning agent.

[0034] Furthermore, a control device 116 is provided, which is configured to control the drive 112 and the high-pressure pump 108. For example, the feed rate, pressure, and cleaning program can be adjusted, and the cleaning process can be carried out fully automatically by the cleaning system 100. This can also be done, for example, via an app on a mobile phone.

[0035] Optionally, a sieve 134 is provided which is connected to the holder 110 and is arranged so that it can be adjusted by the groove 128 formed by the separating plate 116.

[0036] The function of the cleaning system 100 is explained below.

[0037] First, the nozzle heads 136 of the cleaning nozzles 104 are aligned to the desired position. This can, for example, be the locations on the separating plate 106 and the front plate 132 where deposits and / or algae growth have accumulated.

[0038] The pressure, feed rate, and cleaning program are then adjusted using the control device 116. However, it is also possible for no control device 116 to be present and for the drive 112 and the high-pressure pump 108 to be adjusted separately.

[0039] Cleaning is then started, and the high-pressure pump 108 delivers water and / or cleaning agent to the nozzle heads 136 of the cleaning nozzles 104. Depending on the setting, each cleaning nozzle 104 can be supplied separately. It is therefore possible to use all cleaning nozzles 104 or, for example, only the first cleaning nozzle 104a or only the second cleaning nozzle 104b, or even the first cleaning nozzle 104a and the third cleaning nozzle 104c. All combinations are configurable.

[0040] At the same time, the drive 112 adjusts the swivel arm 114 and thus the holder 110 with the cleaning nozzles 104 along the trajectory of the separating plate 106. The cleaning nozzles 104 are therefore in the desired orientation relative to the separating plate 106 at all times.

[0041] Thus, the entire separating plate 106 and also the front plate 132 are freed from deposits and / or algae growth, whereby the high pressure of the sprayed water and / or cleaning agent ensures that the deposits and / or algae growth are destroyed or shredded.

[0042] Optionally, the sieve 134 is attached to the holder 110 and is adjusted along the channel 128 in the liquid 120 within the channel 128 formed by the separating plate 106, so that deposits and / or algae growth that get into the liquid 120 in the channel 128 during the cleaning process are captured by the sieve 134.

[0043] In this way, the deposits and / or algae growth are removed properly and safely, so that the measuring point S remains free of contamination and proper measurement is ensured.

[0044] Such a cleaning system 100 is suitable for use in both primary clarifiers and secondary clarifiers. LIST OF REFERENCE SYMBOLS: 100 cleaning system 102 sewage treatment tanks 104 Cleaning nozzle 104a first cleaning nozzle 104b second cleaning nozzle 104c third cleaning nozzle 104d fourth cleaning nozzle 106 Divider plate 108 High pressure pump 110 bracket 112 drive 114 Swivel arm 116 Control device 118 edge 120 liquid 122 inward-facing surface 124 outward-facing surface 126 Pool edge 128 gutter 130 legs 131 second leg 132 sheet metal 134 Sieve 136 nozzle head 137 floor 138 Floor (pre-sheet) A rotation axis S measuring point

Claims

[1] Cleaning system (100) for a sewage treatment plant with a clarifier (102), with at least one cleaning nozzle (104) which, in its intended use, is directed towards a separating plate (106) in the clarifier (102), and with a high-pressure pump (108) fluidically connected to the cleaning nozzle (104) for providing water and / or a cleaning agent, wherein the cleaning nozzle (104) is attached to a holder (110) which is adjustable along a trajectory, and wherein the trajectory corresponds to a course of the separating plate (106) in the clarifier (102). [2] Cleaning system (100) according to claim 1, characterized by that a drive (112) is provided which is operatively connected to the holder (110) so that the holder (110) can be adjusted by means of the drive (112). [3] Cleaning system (100) according to claim 1 or 2, characterized bythat the holder (110) is attached to a pivot arm (114) rotatable about a rotation axis (A) and the pivot arm (114) is adjustable by the drive (112). [4] Cleaning system (100) according to one of claims 1 to 3, characterized by that a control device (116) is provided which is designed to control the drive (112) and the high-pressure pump (108). [5] Cleaning system (100) according to one of claims 1 to 4, characterized by that the cleaning nozzle (104) is directed towards an edge (118) of the separating plate (106) which protrudes at least partially from the liquid (120) present in the clarifier (102). [6] Cleaning system (100) according to one of claims 1 to 5, characterized by that at least two of the cleaning nozzles (104) are present. [7] Cleaning system (100) according to one of claims 1 to 6, characterized by that at least three of the cleaning nozzles (104) are present. [8] Cleaning system according to one of claims 1 to 7, characterized by that a first cleaning nozzle (104, 104a) is directed onto a surface (122) of the separating plate (106) which is directed inwardly with respect to the clarifier (102). [9] Cleaning system (100) according to one of claims 1 to 8, characterized by that a second cleaning nozzle (104, 104b) is directed onto a surface (124) of the separating plate (106) which is directed outwards with respect to the clarifier (102). [10] Cleaning system (100) according to claim 8 or 9, characterized by that the separating plate (106) forms one leg (130) of a channel (128) running along a basin edge (126) of the settling basin, and that a third cleaning nozzle (104, 104c) is directed onto a second leg (130) of the channel (128). [11] Cleaning system (100) according to one of claims 1 to 10, characterized by that a fourth cleaning nozzle (104, 104d) is directed towards a sheet metal guard (132) present in the clarifier (102). [12] Cleaning system (100) according to one of claims 1 to 11, characterized by that a sieve (134) is attached to the holder (110) and is adjustable within the channel (128) formed by the separating plate (16). [13] Cleaning system (100) according to one of claims 1 to 12, characterized by that the orientation of a nozzle head (136) of the cleaning nozzle (104) is adjustable. [14] Settling tank (102) with a cleaning system (100) according to one of claims 1 to 13. [15] A sewage treatment plant comprising a clarifier (102) according to claim 14.

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