Liquid level change monitoring device for MBBR (moving bed biofilm reactor) biochemical system

Abstract

The utility model discloses a liquid level change monitoring device for an MBBR (Moving Bed Biofilm Reactor) biochemical system, which is characterized in that a device shell is fixedly connected in a biochemical pool, a laser distance sensor is fixedly arranged at the inner top of the device shell, an upper limiting plate is arranged at the inner upper part of the device shell, and a lower limiting plate is arranged at the inner lower part of the device shell; and a density-adjustable floater is arranged between the upper limiting plate and the lower limiting plate. A reflecting plate is arranged at the top of the density-adjustable floater, and an aeration cleaner is arranged in the device shell below the lower limiting plate; a sludge discharge structure is arranged in the device shell below the aeration cleaner, the sludge discharge structure comprises a plurality of sludge discharge guide plates which are obliquely arranged, and the bottom of the device shell is bent to form a sludge discharge port. According to the utility model, the real-time liquid level change can be monitored according to the floating of the sewage liquid level, the detection interference of float sludge and foam on the non-contact type sensor can be completely avoided, the replacement frequency of the static pressure type liquid level meter can be reduced, and the liquid level change monitoring accuracy can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a device for monitoring liquid level changes in an MBBR biochemical system. Background Technology

[0002] Biological treatment methods are commonly used in the treatment of domestic sewage and industrial wastewater. Among them, MBBR is an important component of the biofilm method for removing total nitrogen. Sewage is prone to forming sludge in the anoxic zone and foam in the aerobic zone. MBBR requires an interception device when in use. In both anoxic and aerobic zones, an accurate liquid level monitoring device is needed to detect changes in liquid level and protect the interception screen.

[0003] In biological treatment tanks for domestic sewage and industrial wastewater, the presence of scum, sludge, and corrosive substances in the wastewater makes it difficult for non-contact level sensors to accurately measure the actual liquid level. Furthermore, the presence of corrosive substances in the water often causes contact-type hydrostatic level sensors to display abnormalities. Therefore, there is an urgent need for a solution to accurately test the liquid level protection system of the MBBR (Multi-Level Bioreactor) to monitor its stable operation. Utility Model Content

[0004] To address the problem that existing liquid level sensors cannot accurately measure actual liquid levels, this invention provides a liquid level change monitoring device for MBBR biochemical systems. It can monitor real-time liquid level changes based on the floating of wastewater surface, completely avoid interference from floating sludge and foam on non-contact sensors, reduce the replacement frequency of hydrostatic level gauges, and improve the accuracy of liquid level change monitoring.

[0005] The present invention adopts the following technical solution:

[0006] A device for monitoring liquid level changes in an MBBR biochemical system includes a device housing fixedly connected inside the biochemical tank. A laser distance sensor is fixedly installed on the top inner part of the device housing. An upper limit plate is installed on the upper inner part of the device housing, and a lower limit plate is installed on the lower inner part of the device housing. A density-adjustable float is installed inside the device housing between the upper limit plate and the lower limit plate.

[0007] The top of the density-adjustable float is equipped with a reflector, and a liquid inlet is opened on the reflector. The density-adjustable float is hollow inside, and liquid can be poured into the density-adjustable float through the liquid inlet to adjust the density of the density-adjustable float.

[0008] An aeration cleaner is installed inside the device housing below the lower limit plate, and the aeration cleaner is connected to an air supply pipe; a sludge discharge structure is installed inside the device housing below the aeration cleaner, the sludge discharge structure includes multiple inclined sludge discharge guide plates, the bottom of the device housing is bent to form a sludge discharge port, and multiple sludge discharge holes are provided on the sludge discharge port.

[0009] Preferably, the laser distance sensor is connected to a signal acquisition device via a signal transmission cable, and the signal acquisition device is connected to a host computer.

[0010] Preferably, the upper limit plate has a circular hole in the middle, and the lower limit plate has a cross baffle in the middle.

[0011] Preferably, the outer casing of the device is fixed to the inner wall of the biochemical tank by a fixing bracket.

[0012] Preferably, the aeration cleaner is provided with multiple aeration holes and multiple sewage discharge holes.

[0013] Preferably, the outer shell, density-adjustable float, aerator, and sludge discharge guide plate of the device are all made of corrosion-resistant materials.

[0014] The beneficial effects of this utility model are:

[0015] (1) The outer shell, density adjustable float, aerator and sludge discharge guide plate of the device are all made of stainless steel, which has low cost, low energy consumption and long service life.

[0016] (2) Easy to install: The device has a simple overall structure and small size. It is fixed to the wall of the biochemical tank with stainless steel expansion bolts or chemical bolts, making it easy to install and maintain.

[0017] (3) High detection accuracy: The rise and fall of the density adjustable float is detected by a laser distance sensor, which can accurately detect changes in liquid level.

[0018] (4) Good use and maintenance effect: Regularly use the aeration cleaner to clean the internal floating mud, which is cheaper than replacing the static pressure level gauge. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the usage status of a liquid level change monitoring device for an MBBR biochemical system.

[0021] Figure 2 This is a schematic diagram of the upper limit plate.

[0022] Figure 3 This is a schematic diagram of the lower limit plate.

[0023] Figure 4 This is a schematic diagram of an aeration cleaner.

[0024] Figure 5 This is a schematic diagram of the sludge discharge port. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments:

[0026] Combination Figures 1 to 5 A device for monitoring liquid level changes in an MBBR biochemical system has a housing 6 fixedly connected inside the biochemical tank 4. Specifically, the housing 6 is fixed to the inner wall of the biochemical tank 4 by a fixing bracket 5.

[0027] A laser distance sensor 7 is fixedly installed on the top inner part of the device housing 6, an upper limit plate 12 is installed on the upper inner part of the device housing 6, and a lower limit plate 20 is installed on the lower inner part of the device housing.

[0028] The laser distance sensor 7 is connected to the signal acquisition device 1 via the signal transmission cable 3. The signal acquisition device is connected to the host computer and is fixed by the bracket 2.

[0029] A density-adjustable float 8 is installed inside the housing of the device between the upper limit plate 12 and the lower limit plate 20.

[0030] The upper limit plate 12 and the lower limit plate 20 serve to limit the position of the density adjustable float 8, which can move up and down with the liquid level within the device housing between the upper limit plate 12 and the lower limit plate 20.

[0031] A circular hole 13 is provided in the middle of the upper limit plate so that the laser distance sensor 7 can detect the density adjustable float 8 through the circular hole.

[0032] A cross baffle 14 is provided in the middle of the lower limit plate. The cross baffle is hollow around its perimeter to allow sludge and other substances to pass through.

[0033] The top of the density-adjustable float 8 is equipped with a reflector 9, which facilitates detection by the laser distance sensor 7.

[0034] The reflector is provided with a liquid inlet 10. The density-adjustable float is hollow inside. Liquid can be poured into the density-adjustable float through the liquid inlet to adjust the density of the float.

[0035] Adjust the density of the adjustable float to meet the needs of various water qualities so that the adjustable float can float normally on various water surfaces. The reflector 9 should be 3-5 cm away from the sewage surface of the biological treatment tank.

[0036] An aerator 18 is installed inside the housing of the device below the lower limit plate. An air supply pipe 19 is connected to the bottom of the aerator 18 and extends to the outside of the biochemical tank to connect to the air supply equipment.

[0037] The aeration cleaner is equipped with multiple aeration holes 21 and multiple sludge discharge holes 22. The sludge discharge holes run through the entire aeration cleaner so that the sludge can fall into the sludge discharge structure from the sludge discharge holes.

[0038] The aeration cleaner 18 cleans the sludge adhering to the inside of the device shell and the density adjustable float by aeration through the aeration holes. The cleaned sludge falls into the sludge discharge structure through the sludge discharge hole, ensuring the normal movement of the density adjustable float and the accuracy of detection.

[0039] The aeration cleaner has a sludge discharge structure 15 inside the outer casing. The sludge discharge structure includes multiple inclined sludge discharge guide plates 16. The bottom of the outer casing is bent to form a sludge discharge port 17, and multiple sludge discharge holes 23 are provided on the sludge discharge port.

[0040] The sludge slides along the inclined sludge guide plate to the sludge discharge port, and then is discharged through the sludge discharge hole. The size of the sludge discharge hole must be large enough to prevent the MBBR packing material from entering the sludge discharge port. The sludge guide plate also prevents sludge backflow.

[0041] The outer casing, density-adjustable float, aerator, and sludge discharge guide plate are all made of corrosion-resistant stainless steel.

[0042] A water inlet 11 is provided in the middle of the device casing. The water inlet is located at the top of the aeration cleaner. When the device casing is installed, the water inlet is below the sewage level in the biological treatment tank.

[0043] If the liquid level in the biological treatment tank changes, the density-adjustable float will move vertically accordingly. The laser distance sensor can detect the floating distance of the reflector to monitor the changes in the liquid level in the biological treatment tank in real time. The operating data is transmitted to the host computer in the main control room through the cloud platform via the signal acquisition equipment.

[0044] In summary, this invention ensures accurate liquid level measurement with a detection precision below 0.5 mm, meeting the operating conditions for MBBR biological treatment systems. This invention solves the technical problem of inaccurate liquid level monitoring in biological treatment tanks caused by floating sludge, foam, and corrosive substances in the wastewater. It reduces the impact of floating sludge and foam on the instrument and improves the accuracy of wastewater level monitoring in MBBR biological treatment tanks.

[0045] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A device for monitoring liquid level changes in an MBBR biochemical system, characterized in that, A device housing is fixedly connected inside the biochemical tank. A laser distance sensor is fixedly installed on the top inner part of the device housing. An upper limit plate is installed on the upper inner part of the device housing. A lower limit plate is installed on the lower inner part of the device housing. A density adjustable float is installed inside the device housing between the upper limit plate and the lower limit plate. The top of the density-adjustable float is equipped with a reflector, and a liquid inlet is opened on the reflector. The density-adjustable float is hollow inside, and liquid can be poured into the density-adjustable float through the liquid inlet to adjust the density of the density-adjustable float. An aeration cleaner is installed inside the device housing below the lower limit plate, and the aeration cleaner is connected to an air supply pipe; a sludge discharge structure is installed inside the device housing below the aeration cleaner, the sludge discharge structure includes multiple inclined sludge discharge guide plates, the bottom of the device housing is bent to form a sludge discharge port, and multiple sludge discharge holes are provided on the sludge discharge port.

2. The device for monitoring liquid level changes in an MBBR biochemical system according to claim 1, characterized in that, The laser distance sensor is connected to a signal acquisition device via a signal transmission cable, and the signal acquisition device is connected to a host computer.

3. The device for monitoring liquid level changes in an MBBR biochemical system according to claim 1, characterized in that, The upper limit plate has a circular hole in the middle, and the lower limit plate has a cross baffle in the middle.

4. The device for monitoring liquid level changes in an MBBR biochemical system according to claim 1, characterized in that, The outer casing of the device is fixed to the inner wall of the biochemical tank by a fixing bracket.

5. A device for monitoring liquid level changes in an MBBR biochemical system according to claim 1, characterized in that, The aeration cleaner is equipped with multiple aeration holes and multiple sewage discharge holes.

6. The device for monitoring liquid level changes in an MBBR biochemical system according to claim 1, characterized in that, The outer shell, density-adjustable float, aerator, and sludge discharge guide plate of the device are all made of corrosion-resistant materials.

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