On-line monitoring device and method for sludge concentration and flow in channel type internal return of sewage plant

Abstract

This invention discloses an online monitoring device and method for the concentration and flow rate of sludge in a channel-type internal return system in a wastewater treatment plant. The device includes a biological treatment tank; the biological treatment tank contains multiple anaerobic tanks, multiple anoxic tanks, and multiple aerobic tanks connected sequentially; a mixed liquor internal return channel is provided between the first anoxic tank and the last aerobic tank; the mixed liquor internal return channel is used to return the mixed liquor from the corresponding aerobic tank to the corresponding anoxic tank; a wedge-shaped ultrasonic sensor is installed in the mixed liquor internal return channel; the wedge-shaped ultrasonic sensor scans the mixed liquor in the mixed liquor internal return channel and converts the scanning result into an electrical signal, which is then uploaded to the wastewater treatment plant's central control room. The wastewater treatment plant's central control room detects and calculates the flow rate and concentration by comparing the interrelationships between multiple images or echo patterns ordered chronologically. This invention not only enables rapid and accurate acquisition of flow rate data but also allows for quick disassembly and maintenance.

Description

Technical Field

[0001] This invention relates to the field of urban wastewater treatment plant construction and operation technology, and in particular to an online monitoring device and method for the concentration and flow rate of channel-type internal return sludge in wastewater treatment plants. Background Technology

[0002] Flow measurement in wastewater treatment processes is relatively limited. In terms of measurement locations, water line flow measurement is generally limited to measuring the influent flow before pretreatment, i.e., after the fine screen well and grit chamber; effluent flow measurement is located at the tailwater discharge channel (well); and sludge line flow measurement is mostly for the amount of residual sludge discharged from the secondary sedimentation tank. The measurement method primarily uses channel-type electromagnetic flowmeters.

[0003] In the most critical unit of a wastewater treatment plant—the biological treatment tank—key parameters affecting carbon removal, biological nitrogen and phosphorus removal, and equipment operating energy consumption, such as the influent flow rate of each individual biological treatment tank (the total influent flow rate distributed among all individual biological treatment tanks), the mixed liquor internal return flow rate (affecting biological nitrogen and phosphorus removal efficiency), and the sludge external return flow rate, are rarely measured. When used for control, flow rates are mostly obtained through manual calculations, derived from pump motor speed or operating power current, which cannot achieve accurate data. The number and location of installations are relatively limited, and electromagnetic flow meters are the most common type. However, due to the complexity and harshness of the wastewater environment at the site, the accuracy of electromagnetic flow meters cannot be guaranteed during long-term use.

[0004] Given the above reasons, how to solve the deficiency of existing technologies in obtaining accurate biochemical pool reflux data has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the present invention provides an online monitoring device and method for the concentration and flow rate of sludge in the channel-type internal return sludge of sewage treatment plants. The purpose is to solve the deficiency of the prior art in obtaining accurate biological treatment tank return data. It can not only obtain flow data quickly and accurately, but also realize the detection of water line and sludge line flow rate that can be quickly disassembled and maintained and is adaptable to various sewage treatment processes.

[0006] To achieve the above objectives, the present invention discloses an online monitoring device for the concentration and flow rate of sludge in a channel-type internal return system of a wastewater treatment plant, comprising a biological treatment tank; the biological treatment tank is provided with multiple anaerobic tanks, multiple anoxic tanks and multiple aerobic tanks connected in sequence.

[0007] A mixed liquor recirculation channel is provided between the first anoxic tank in the plurality of anoxic tanks and the last aerobic tank in the plurality of aerobic tanks;

[0008] The internal reflux channel for the mixed liquor is used to return the mixed liquor in the corresponding aerobic tank to the corresponding anoxic tank.

[0009] The last aerobic tank is equipped with an internal reflux pump, which pumps the mixed liquor into the internal reflux channel.

[0010] A wedge-shaped ultrasonic sensor is installed in the internal reflux channel of the mixture.

[0011] The wedge-shaped ultrasonic sensor scans the mixed liquid in the return channel and converts the scanning result into an electrical signal, which is then uploaded to the wastewater treatment plant's central control room.

[0012] Preferably, a counterweight pad is provided in the internal reflux channel of the mixture;

[0013] The wedge-shaped ultrasonic sensor is fixedly connected to the counterweight block at the bottom, and the counterweight block sinks to the bottom of the return channel in the mixture.

[0014] In practical applications, the counterweight pad is made of stainless steel and weighs 10kg. It can prevent the wedge-shaped ultrasonic sensor from being washed away and displaced when the flow rate in the channel is up to 5m / s.

[0015] More preferably, the counterweight pad is connected to a stainless steel hook on the bank of the return channel in the mixture via a stainless steel chain.

[0016] More preferably, the stainless steel chain is equipped with a chain tensioning device.

[0017] Preferably, the wedge-shaped ultrasonic sensor is connected to a field instrument control cabinet located on the bank of the return channel in the mixed liquid via a power supply and control cable, and the electrical signal is uploaded to the central control room of the wastewater treatment plant through the field instrument control cabinet.

[0018] More preferably, the power supply and control cable are fixed to the bottom and inner wall of the return channel in the mixture by multiple stainless steel pipe clamps.

[0019] Preferably, a suspension chain hoist is provided on the bank of the internal reflux channel of the mixture.

[0020] The overhead chain hoist is fixed to the bank of the return channel in the mixed liquid by footings.

[0021] The base is equipped with a rotating adjustment disc and a stainless steel straight rod in sequence.

[0022] More preferably, the upper end of the stainless steel straight rod is provided with a stainless steel inclined support rod including a lifting nylon pulley;

[0023] The stainless steel inclined support rod, including the lifting nylon pulley, is fitted with a stainless steel suspension chain;

[0024] When maintaining the internal reflux channel of the mixture, the position of the stainless steel inclined support rod is adjusted by the rotating adjustment plate, and the wedge-shaped ultrasonic sensor is suspended by the stainless steel suspension chain.

[0025] The present invention also provides a detection method for an online monitoring device for the concentration and flow rate of sludge in a channel-type internal return sludge in a wastewater treatment plant. The wedge-shaped ultrasonic sensor emits ultrasonic pulses with a fixed angle range every 1 to 10 milliseconds to scan the mixed liquid in the flange-type through-wall pipe of the internal return pump, collects the position of 16 layers of micro-particle reflectors in the mixed liquid, and saves the obtained echoes as images or electrical signals in echo mode and uploads them to the central control room of the wastewater treatment plant.

[0026] The wastewater treatment plant's central control room detects and calculates flow rate and concentration by comparing the relationships between multiple images or echo patterns ordered chronologically, based on the location of the identified 16 layers of micro-particle reflectors.

[0027] The beneficial effects of this invention are:

[0028] This invention not only enables rapid and accurate acquisition of flow data, but also allows for quick disassembly and maintenance, and is adaptable to various wastewater treatment processes for water line and sludge line flow detection.

[0029] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0030] Figure 1 A schematic diagram of an embodiment of the present invention is shown.

[0031] Figure 2 This diagram illustrates a structure in which a wedge-shaped ultrasonic sensor is installed in the reflux channel of the mixture according to an embodiment of the present invention. Detailed Implementation

[0032] Example

[0033] like Figure 1 and Figure 2 As shown, the wastewater treatment plant channel-type internal return sludge concentration and flow rate online monitoring device includes a biological treatment tank; the biological treatment tank is provided with multiple anaerobic tanks 9, multiple anoxic tanks 10 and multiple aerobic tanks 11 connected in sequence.

[0034] A mixed liquor recirculation channel 12 is provided between the first anoxic pool 10 among the plurality of anoxic pools 10 and the last aerobic pool 11 among the plurality of aerobic pools 11;

[0035] The mixed liquor recirculation channel 12 is used to return the mixed liquor 8.7 in the corresponding aerobic tank 11 to the corresponding anoxic tank 10;

[0036] The last aerobic tank 11 is equipped with an internal reflux pump 8, which pumps the mixed liquid 8.7 into the mixed liquid internal reflux channel 12.

[0037] A wedge-shaped ultrasonic sensor 8.1 is installed in the internal reflux channel 12 of the mixture;

[0038] The wedge-shaped ultrasonic sensor 8.1 scans the mixed liquid 8.7 in the mixed liquid return channel 12 and converts the scanning result into an electrical signal and uploads it to the wastewater treatment plant control room.

[0039] In practical applications, the housing of the wedge-shaped ultrasonic sensor 8.1 is made of waterproof polypropylene or engineering plastic, with an insulation and protection rating of not less than IP68.

[0040] This invention is applicable to both new and existing projects. Embedding a high-frequency continuous pulse ultrasonic cross-correlation flow detection device in a channel enables rapid installation and accurate detection.

[0041] In some embodiments, a weighted pad 8.3 is provided in the internal reflux channel 12 of the mixture; the lower part of the wedge-shaped ultrasonic sensor 8.1 is fixedly connected to the weighted pad 8.3, and the weighted pad 8.3 sinks to the bottom of the internal reflux channel 12 of the mixture.

[0042] The wedge-shaped ultrasonic sensor 8.1 is placed in the channel by a weighted pad 8.3, so it will not be washed away by the water flow.

[0043] In practical applications, the counterweight pad 8.3 is made of stainless steel and weighs 10kg. It can prevent the wedge-shaped ultrasonic sensor 8.1 from being washed away and displaced when the channel has a maximum flow rate of 5m / s.

[0044] In some embodiments, the counterweight pad 8.3 is connected to a stainless steel hook 8.8.6 on the bank of the return channel 12 of the mixture via a stainless steel chain 8.8.7.

[0045] In some embodiments, the stainless steel chain 8.8.7 is provided with a chain tensioning device 8.8.8.

[0046] In some embodiments, the wedge-shaped ultrasonic sensor 8.1 is connected to a field instrument control cabinet 8.2 located on the bank of the return channel 12 in the mixed liquid via a power supply and control cable 8.4, and the field instrument control cabinet 8.2 transmits electrical signals to the central control room of the wastewater treatment plant.

[0047] In some embodiments, the power supply and control cable 8.4 is secured to the bottom and inner wall of the reflux channel 12 in the mixture by a plurality of stainless steel pipe clamps 8.5.

[0048] In some embodiments, a suspension chain hoist 8.8 is provided on the bank of the internal reflux channel 12 of the mixture.

[0049] The overhead chain hoist 8.8 is fixed to the bank of the return channel 12 in the mixed liquid via foot 8.8.2;

[0050] The foot 8.8.2 is provided with a rotating adjustment disc 8.8.3 and a stainless steel straight rod 8.8.4 in sequence.

[0051] In some embodiments, the upper end of the stainless steel straight rod 8.8.4 is provided with a stainless steel inclined support rod 8.8.5 including a lifting nylon pulley;

[0052] The stainless steel inclined support rod 8.8.5, including the lifting nylon pulley, is fitted with a stainless steel suspension chain 8.8.1;

[0053] When maintaining the internal reflux channel 12 of the mixture, the position of the stainless steel inclined support rod 8.8.5 is adjusted by the rotating adjustment plate 8.8.3, and the wedge-shaped ultrasonic sensor 8.1 is suspended by the stainless steel suspension chain 8.8.1.

[0054] In practical applications, the overhead chain hoist 8.8 can lift the wedge-shaped ultrasonic sensor 8.1 at any position by rotating the adjusting disc 8.8.3 around 360°.

[0055] When maintenance of the wedge-shaped ultrasonic sensor 8.1 is required, stop the operation of the internal reflux pump 8 and lift the wedge-shaped ultrasonic sensor 8.1 using the overhead chain hoist 8.8.

[0056] The present invention also provides a detection method for an online monitoring device for the concentration and flow rate of sludge in a channel-type internal return sludge in a wastewater treatment plant. The wedge-shaped ultrasonic sensor 8.1 emits ultrasonic pulses 8.6 with a fixed angle range every 1 to 10 milliseconds to scan the mixed liquid 8.7 in the flange-type through-wall pipe 1.7.1 of the internal return pump, collects the position of 16 layers of micro-particle reflectors in the mixed liquid 8.7, and saves the obtained echoes as images or electrical signals in echo mode and uploads them to the central control room of the wastewater treatment plant.

[0057] The wastewater treatment plant's central control room detects and calculates flow rate and concentration by comparing the relationships between multiple images or echo patterns ordered chronologically, based on the location of the 16 layers of tiny particulate reflectors identified.

[0058] This invention differs from the electromagnetic principle of traditional channel-installed electromagnetic flowmeters or the static pressure difference principle of Venturi flowmeters. It employs high-frequency continuous pulse ultrasonic cross-correlation flow detection technology, simultaneously capturing suspended particles (bubbles, colloids, etc.) in 16 layers of the flow cross section. Utilizing the echo patterns of suspended particles in each layer, a correlation inversion algorithm is used to derive the flow rate of each layer. Then, based on the geometric properties and dimensions of the flow cross section, the flow rate of each layer is digitally and analogically superimposed to obtain the true flow rate of the entire flow cross section.

[0059] The above measurement principle is similar to high-resolution radar active remote sensing technology. The difference is that this patent uses continuous pulse high-frequency ultrasound, while radar remote sensing uses pulse electromagnetic waves.

[0060] Radar pulse electromagnetic waves have long transmission distances and are susceptible to electromagnetic noise, requiring complex noise equalization processing. Furthermore, the highest resolution of reflective objects currently available is only 5nm, representing the limit of measurement accuracy. This patent employs a short-range ultrasonic emission method for flow detection, unaffected by any electromagnetic interference during transmission, resulting in a high signal-to-noise ratio and high detection accuracy.

[0061] This invention employs high-frequency continuous pulse ultrasonic cross-correlation flow detection technology to rationally arrange the online flow detection system for all water lines and sludge lines in the biological treatment unit of a wastewater treatment plant. The installation and maintenance methods of the detection equipment are explained. The accurate flow detection results obtained can serve as a big data foundation for the efficient and energy-saving operation of wastewater treatment plants, thus contributing to the digital transformation and green and low-carbon development of wastewater treatment plants through economic savings.

[0062] The wastewater treatment plant channel-type internal return sludge concentration and flow rate online monitoring device of the present invention is used to detect wastewater return. When the channel flow velocity is <1m / s, the measurement inaccuracy is ±0.5%+5mm / s of the measured value; when the channel or open channel flow velocity is >1m / s, the measurement inaccuracy is ±1% of the measured value.

[0063] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An online monitoring device for the concentration and flow rate of sludge in a channel-type internal return system of a wastewater treatment plant, comprising a biological treatment tank; wherein the biological treatment tank is provided with multiple anaerobic tanks (9), multiple anoxic tanks (10), and multiple aerobic tanks (11) connected in sequence; characterized in that: A mixed liquor recirculation channel (12) is provided between the first of the plurality of anoxic tanks (10) and the last of the plurality of aerobic tanks (11); The internal reflux channel (12) is used to return the mixed liquor (8.7) in the corresponding aerobic tank (11) to the corresponding anoxic tank (10); The last aerobic tank (11) is equipped with an internal reflux pump (8), through which the mixed liquor (8.7) is fed into the internal reflux channel (12); A wedge-shaped ultrasonic sensor (8.1) is installed in the internal reflux channel (12) of the mixture; The wedge-shaped ultrasonic sensor (8.1) scans the mixed liquid (8.7) in the mixed liquid return channel (12) and converts the scanning result into an electrical signal, which is then uploaded to the wastewater treatment plant control room. The internal reflux channel (12) of the mixture is equipped with a weight pad (8.3); The wedge-shaped ultrasonic sensor (8.1) is fixedly connected to the counterweight block (8.3) at its bottom, and the counterweight block (8.3) is submerged at the bottom of the return channel (12) in the mixture. The wedge-shaped ultrasonic sensor (8.1) is placed in the channel by a weight pad (8.3) and will not be washed away by the water flow. The ballast pad (8.3) is connected to a stainless steel hook (8.8.6) on the bank of the return channel (12) of the mixed liquid via a stainless steel chain (8.8.7); The stainless steel chain (8.8.7) is equipped with a chain tensioning device (8.8.8); The online monitoring device for the concentration and flow rate of the wastewater treatment plant's channel-type internal return sludge adopts high-frequency continuous pulse ultrasonic cross-correlation flow detection technology. It simultaneously captures suspended particles in 16 layers of the flow cross section. Using the echo patterns of suspended particles in each layer, the flow rate of each layer is obtained through a related inversion algorithm. Then, based on the geometric properties and size of the flow cross section, the flow rate of each layer is superimposed to obtain the true flow rate of the entire flow cross section.

2. The online monitoring device for concentration and flow rate of wastewater treatment plant channel-type internal return sludge according to claim 1, characterized in that, The wedge-shaped ultrasonic sensor (8.1) is connected to the field instrument control cabinet (8.2) located on the bank of the return channel (12) in the mixed liquid via a power supply and control cable (8.4), and the electrical signal is uploaded to the central control room of the sewage treatment plant through the field instrument control cabinet (8.2).

3. The online monitoring device for concentration and flow rate of wastewater treatment plant channel-type internal return sludge according to claim 2, characterized in that, The power supply and control cable (8.4) is fixed to the bottom and inner wall of the reflux channel (12) in the mixture by multiple stainless steel pipe clamps (8.5).

4. The online monitoring device for concentration and flow rate of wastewater treatment plant channel-type internal return sludge according to claim 1, characterized in that, The pool top suspension hoist (8.8) is installed on the bank of the internal reflux channel (12) of the mixed liquid; The overhead chain hoist (8.8) is fixed to the bank of the return channel (12) in the mixed liquid by foot (8.8.2); The foot (8.8.2) is provided with a rotating adjustment disc (8.8.3) and a stainless steel straight rod (8.8.4) in sequence.

5. The online monitoring device for concentration and flow rate of wastewater treatment plant channel-type internal return sludge according to claim 4, characterized in that, The upper end of the stainless steel straight rod (8.8.4) is provided with a stainless steel inclined support rod (8.8.5) including a lifting nylon pulley; The stainless steel inclined support rod (8.8.5), including the lifting nylon pulley, is fitted with a stainless steel catenary (8.8.1); When maintaining the internal reflux channel (12) of the mixture, the position of the stainless steel inclined support rod (8.8.5) is adjusted by the rotating adjustment plate (8.8.3), and the wedge-shaped ultrasonic sensor (8.1) is suspended by the stainless steel catenary (8.8.1).

6. The detection method of the online monitoring device for concentration and flow rate of wastewater treatment plant channel-type internal return sludge according to claim 1, characterized in that, The wedge-shaped ultrasonic sensor (8.1) emits ultrasonic pulses (8.6) with a fixed angle range every 1 to 10 milliseconds to scan the mixed liquid in the flange-type through-wall pipe (1.7.1) of the internal return pump, collect the position of 16 layers of micro-particle reflectors in the mixed liquid, and save the obtained echo as an image or an echo mode electrical signal and upload it to the central control room of the sewage treatment plant. The wastewater treatment plant's central control room detects and calculates flow rate and concentration by comparing the relationships between multiple images or echo patterns ordered chronologically, based on the location of the identified 16 layers of micro-particle reflectors.

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