Targeted dredging system and method for urban pipe network based on DOM fluorescence tracing

Abstract

The application belongs to the technical field of municipal pipe network cleaning, and particularly relates to a city pipe network targeted dredging system and method based on DOM fluorescence tracing, which comprises a U-shaped dredging pipe, two pipe bodies of the U-shaped dredging pipe are used for being respectively installed to two sides of a manhole, and a dredging opening is arranged on a pipe wall of a bending part of the U-shaped dredging pipe; further comprising an adjusting device, the adjusting device comprises a first driving device and a spherical grinding plug, the adjusting device is used for at least closing or opening the dredging opening, so that the U-shaped dredging pipe and the manhole are disconnected or communicated, and further comprising a control system. The application solves the technical problems that the traditional pipe network dredging is not strong in pertinence and the effect evaluation is lagging, further expands the application scene of the DOM fluorescence characteristics, is suitable for multiple scenes such as municipal pipe network dredging, manhole automatic cleaning, pipe network pollution tracing and the like, has the technical advantages of simple operation, strong targeting and wide adaptability, and can effectively improve the city pipe network dredging efficiency and the pollution control ability.

Description

Technical Field

[0001] This invention belongs to the field of municipal pipeline cleaning technology, specifically a targeted dredging system and method for urban pipelines based on DOM fluorescence tracing. Background Technology

[0002] Sludge from drainage ditches is a collection of pollutants formed during the operation of municipal pipe networks by the accumulation of externally introduced particles, pipe corrosion products, and microbial metabolites. Its composition is complex, containing a large amount of fine particles, dissolved organic matter (DOM), heavy metals, and pathogenic microorganisms. Currently, pipe network dredging primarily employs traditional methods, such as manual dredging, high-pressure water flushing, and mechanical suction dredging, which generally suffer from the following technical shortcomings:

[0003] 1. Poor targeting and blindness in sludge removal: Traditional sludge removal relies on manual inspection or pipeline diagrams, which cannot accurately identify the core areas of sludge accumulation, pollution sources and sludge activity. This often leads to problems of "over-sludge removal" or "missed sludge removal", which not only wastes manpower and resources, but may also cause secondary damage to the pipeline structure. At the same time, the sludge removal strategy is not optimized for pollution sources, resulting in sludge accumulation again in a short period of time after sludge removal.

[0004] 2. Disconnection between pollution source tracing and dredging: The pollution sources of ditch sludge (such as mixed flow of domestic sewage, illegal discharge of industrial wastewater, and surface runoff) directly determine the priority of dredging and subsequent control measures. However, existing technologies lack efficient pollution source tracing methods and cannot quickly locate pollution inflow points through sludge characteristics. As a result, dredging can only remove existing sludge and cannot curb incremental pollution from the source.

[0005] 3. Lack of quantitative basis for evaluating dredging effect: Traditional dredging uses "no obvious siltation" as the judgment standard, which cannot use quantitative indicators to evaluate the degree of sludge removal and the effect of water quality improvement in the pipeline network, making it difficult to form a closed-loop management of "source tracing-dredging-evaluation".

[0006] Therefore, there is an urgent need to develop a targeted dredging system and method for urban pipe networks based on DOM fluorescence fingerprinting. This system can identify the source of sludge pollution and the core area of ​​siltation through DOM fluorescence fingerprinting, guide the precise operation of dredging equipment, and achieve quantitative evaluation of dredging effect. It can also build a complete technical system of "source tracing-location-dredging-evaluation" to make up for the shortcomings of existing technologies. Summary of the Invention

[0007] To address the fundamental shortcomings of existing technologies, this invention aims to provide a targeted dredging system and method for urban pipe networks based on DOM fluorescence tracing. The core idea of ​​this method is to accurately determine the flocculation effect by monitoring the interference peak of the flocs generated by the flocculant on the DOM fluorescence probe signal, thereby selecting the optimal dredging method to achieve distributed targeted dredging of urban pipe networks and thorough cleaning of sewage in manholes.

[0008] In a first aspect, the present invention provides a targeted dredging system for urban pipe networks based on DOM fluorescence tracing, comprising a U-shaped dredging pipe, the two pipe bodies of which are respectively installed on both sides of a manhole, and a sedimentation port is provided on the pipe wall of the bend of the U-shaped dredging pipe; it also includes an adjustment device, which comprises a first driving device and a spherical grinding plug, and the adjustment device is at least used to close or open the sedimentation port, so that the U-shaped dredging pipe and the manhole are isolated or connected; It also includes a control system, which includes: Controller: Used to receive water level data and spectral data collected by fluorescence probe, analyze peak height false height rate, full width at half maximum (FWHM) broadening, CV value, adjacent variation amplitude parameters, and match peak A / peak T thresholds; Signal acquisition and sensing unit: includes a fluorescence probe and a water level sensor, used to acquire DOM fluorescence spectra and manhole water levels, respectively; The execution drive unit includes an electromagnetic actuator, which controls the first drive device to close or open the sedimentation port according to the controller instructions; Safety warning and alarm unit: used to monitor abnormal system conditions and trigger audible and visual alarms; Power supply and communication unit: Used to supply power to the system and enable local device communication and remote data uploading.

[0009] Preferably, it also includes a mobile sludge dredging vehicle, which is equipped with an air compressor, power supply, screw press dewatering machine, vacuum filtration equipment, ultrafiltration equipment, horizontal screw centrifuge dewatering machine, input pipeline and output pipeline.

[0010] Preferably, the first driving device is an electric push rod, and the spherical grinding plug is connected to the electric push rod.

[0011] Preferably, the adjusting device further includes a rotating rod and a motor connected to the rotating rod. The rotating rod is used to rotate laterally and is installed on the inner wall of the manhole. The first driving device is fixedly installed on the rotating rod.

[0012] Preferably, it also includes a garbage basket, which is installed inside the manhole below the municipal pipeline network to intercept solid waste and prevent blockage of the sedimentation port.

[0013] A second aspect of the present invention provides a targeted dredging method for urban pipe networks based on DOM fluorescence tracing, using the system described in any of the above claims. A garbage basket is placed below the municipal pipe network, the sedimentation port is kept open, and the fluorescence probe is powered on in real time. The dredging method includes routine dredging and deep dredging. Routine dredging is performed when the water level in the manhole exceeds the bottom of the pipe network, including: A1. Close the sedimentation port; connect the input and output pipes of the mobile dredging vehicle to the two ports of the U-shaped dredging pipe respectively; A2. Turn on the air compressor of the sludge dredging truck and intermittently send air into the U-shaped sludge dredging pipe to mix the sewage and the sludge settled at the bottom of the U-shaped sludge dredging pipe evenly. Then quickly add the agent and intermittently send air to impact the sewage to cause rapid flocculation. A3. When the fluorescence intensity value meets the corresponding conditions, different solid-liquid methods are selected for dredging operations. The collection time range of the fluorescence probe is 30 seconds to 2 minutes. During the dredging operation, the collection frequency of the fluorescence probe is 1 to 5 times / second.

[0014] Preferably, when the water level in the manhole is lower than the bottom of the pipe network, deep dredging is carried out, including: B1. Repeat steps A1 and A2, first ensuring that the U-shaped sludge removal pipe is kept clean; B2. Start the motor to drive the rotating rod to rotate back and forth, so that the spherical grinding plug cleans the bottom of the manhole. Then, pump the sewage through the U-shaped sludge removal pipe to the deep cleaning suction limit. After that, control the adjustment device to close the sludge inlet of the spherical grinding plug. The deep cleaning suction limit is between 20cm and 50cm below the manhole cover. B3. Add the agent into the U-shaped sludge removal pipe and then pump it into the mobile sludge removal vehicle to complete the solid-liquid separation. B4. Repeat steps B2 and B3 until deep cleaning is complete.

[0015] Preferably, after cleaning, the fluorescent probe should be below the water level. If the water level is insufficient, a mobile sludge removal vehicle should be used to replenish the cleaning water source or reclaimed water source.

[0016] Preferably, in step A3, when the fluorescence peak detected by the fluorescence probe is within the following range, the wastewater is pumped into a mobile sludge removal vehicle and then treated using a screw press dewatering machine, vacuum filtration equipment, or ultrafiltration equipment: Peak A core parameter matching characteristics: peak height false height rate ≤10%, full width at half maximum (FWHM) broadening ≤5nm, CV ≤10%, adjacent variation amplitude ≤8%; Peak T core parameter matching characteristics: peak height false height rate ≤20%, FWHM broadening ≤10nm, CV ≤15%, adjacent variation amplitude ≤12%; Where CV is the coefficient of variation.

[0017] Preferably, in step A3, when the fluorescence peak detected by the fluorescence probe is within the following range, the wastewater is pumped into the mobile sludge removal vehicle and then treated using a centrifugal dewatering machine: Peak A core parameter matching characteristics: peak height false height rate ≥30%, full width at half maximum (FWHM) broadening ≥15nm, CV ≥30%, adjacent variation amplitude ≥20%; Peak T core parameter matching characteristics: peak height false height rate ≥50%, FWHM broadening ≥20nm, CV ≥35%, adjacent variation amplitude ≥30%; Where CV is the coefficient of variation.

[0018] The beneficial effects of this invention are as follows: 1. This invention solves the technical problems of traditional pipeline dredging being untargeted and having a delayed effect evaluation. It also expands the application scenarios of DOM (dissolved organic matter) fluorescence characteristics, and innovatively applies its fluorescence source tracing characteristics to collaborative management of dredging. It is applicable to multiple scenarios such as municipal pipeline dredging, automatic manhole cleaning, and pipeline pollution source tracing. It has the technical advantages of simple operation, strong targeting, and wide adaptability, and can effectively improve the efficiency of urban pipeline dredging and pollution control capabilities.

[0019] 2. This invention, through the separable design of the U-shaped dredging pipe and manhole, combined with DOM fluorescence tracing technology, achieves precise identification and targeted dredging of sludge in urban pipe networks, fundamentally solving the problems of blindness and low efficiency in traditional dredging operations. The fluorescence probe collects DOM spectral data in real time, and by analyzing core parameters such as peak height false height rate, half-peak width broadening, and CV value, it accurately matches sludge conditions with different pollution levels and automatically selects the optimal solid-liquid separation process. This avoids resource waste caused by over-dredging and enables enhanced treatment in heavily polluted areas, significantly improving the targeting and efficiency of dredging operations.

[0020] 3. This invention achieves flexible switching between routine dredging and deep dredging through the multi-functional design of the adjustment device, adapting to the pipeline operation and maintenance needs under different water level conditions: the spherical grinding plug has both sealing and bottom cleaning and scraping functions, and can efficiently disturb stubborn sludge at the bottom of the manhole during deep dredging. Combined with the rapid docking and solid-liquid separation capabilities of the mobile dredging vehicle, it significantly shortens on-site operation time, reduces long-term operation and maintenance costs, and improves the flood resistance and pollution prevention capabilities of the urban drainage system.

[0021] 4. The scope of application of this patent is a multi-purpose device / method for municipal pipeline dredging, pipeline pollution source tracing and automatic manhole cleaning. It is applicable to the treatment of sludge at nodes of urban rainwater, sewage and combined sewer systems, pollutant source tracing and intelligent maintenance of manholes. Attached Figure Description

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the application state of the present invention.

[0024] In the diagram: 10. U-shaped sludge removal pipe; 11. Sedimentation port; 12. Spherical ground plug; 13. Fluorescent probe; 14. Rotating rod; 15. Motor; 16. Garbage basket; 17. First drive device; 20. Mobile sludge removal vehicle; 21. Input pipe; 22. Output pipe; a. Manhole; b. Municipal pipe network; c. Municipal pipe network water level line. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] The definition of DOM (dissolved organic matter) is limited to organic matter that can pass through 0.22μm or 0.45μm filter membranes. Therefore, filtration is a necessary preliminary step for DOM fluorescence fingerprinting, especially for high-SS water samples. In practice, it is difficult to have such pre-filtration conditions. Generally, the fluorescence probe is optimized with an anti-interference excitation-emission wavelength combination, a blank baseline background subtraction mode is enabled, and a turbidity-fluorescence intensity correction model and PCA / PLSR multivariate statistical algorithm are used to eliminate interference from pipeline water samples and improve the accuracy of DOM fluorescence source tracing.

[0027] The interference of suspended particulate matter (SS) on fluorescence detection does not increase at a uniform rate. 3000 mg / L is a critical threshold. Above this concentration, the interference increases exponentially with the rise of SS. This is the upper limit of SS that needs to be strictly controlled in pipeline fluorescence tracing. When SS reaches 3000 mg / L or above, a large number of suspended particulate matter will cause a triple problem of strong scattering, spectral superposition, and probe contamination. The fluorescence peak intensity deviation is >50%, and the peak position shift can reach 5–20 nm. The fluorescence fingerprint spectrum becomes chaotic, and even with complex algorithm correction, it is difficult to completely restore the true fluorescence characteristics of DOM. When SS >5000 mg / L, the interference will reach saturation, and fluorescence detection will basically lose its significance for quantitative and qualitative analysis.

[0028] To address this technical drawback, this invention proposes a targeted dredging system for urban pipe networks based on DOM fluorescence tracing, such as... Figure 1 As shown, it includes a U-shaped sludge removal pipe 10, with two pipe bodies for installation on both sides of the manhole a respectively, and a sedimentation port 11 opened on the pipe wall of the bend of the U-shaped sludge removal pipe 10; it also includes an adjustment device, which includes a first drive device 17 and a spherical grinding plug 12, and the adjustment device is used at least to close or open the sedimentation port 11 so that the U-shaped sludge removal pipe 10 and the manhole a are isolated or connected; It also includes a control system, which includes: Controller: Used to receive water level data and spectral data collected by fluorescence probe 13, analyze peak height false height rate, half peak width broadening, CV value, adjacent variation amplitude parameters and match peak A / peak T thresholds; Signal acquisition and sensing unit: includes fluorescence probe 13 and water level sensor, used to acquire DOM fluorescence spectrum and manhole water level, respectively; The execution drive unit includes an electromagnetic actuator for controlling the first drive device 17 to close or open the sedimentation port according to the controller instructions; Safety warning and alarm unit: used to monitor abnormal system conditions and trigger audible and visual alarms; Power supply and communication unit: used to power the fluorescence probe and the first driving device, and to enable local device communication and remote data upload.

[0029] In the above embodiments, the U-shaped sludge dredging pipe 10 is made of corrosion-resistant high-strength PE or ductile iron, and has an overall U-shaped bent structure. Two vertical pipe bodies are pre-embedded in the manhole walls on both sides of manhole a, and the bottom bend extends to the bottom of manhole a. A sludge settling port 11 is opened on the upper pipe wall of the bend, and the edge of the sludge settling port is chamfered to facilitate sludge settling and suction. The top opening of the U-shaped sludge dredging pipe is flush with the manhole cover, and a quick-connect flange is reserved for connection with the pipeline of a mobile sludge dredging vehicle.

[0030] In this invention, the DOM fluorescence probe is a specialized sensor for in-situ, rapid detection of the fluorescence characteristics of dissolved organic matter (DOM) in water. Its original core function was to capture characteristic fluorescence signals of DOM, identifying DOM from different sources (domestic sewage, industrial wastewater, natural water body humus, etc.) to form unique fluorescent fingerprints, thus enabling source tracing of water pollution. This patent, building upon the original function, employs abnormal fluorescence signal acquisition to identify the flocculation state of sediment after chemical treatment in the pipe network. Based on the flocculation state, it determines the adsorption characteristics of suspended solids (SS) and DOM. The core function of the DOM fluorescence probe is to inversely determine the SS concentration and DOM adsorption state by detecting fluorescence parameters, thereby quickly matching suitable solid-liquid separation processes and avoiding the problems of "low SS retention failure and high SS clogging of equipment."

[0031] In some preferred embodiments, a mobile sludge dredging vehicle 20 is also included to facilitate on-site dehydration and separation. The mobile sludge dredging vehicle 20 is equipped with an air compressor, power supply, screw press dehydrator, vacuum filtration equipment, ultrafiltration equipment, horizontal screw centrifuge dehydrator, input pipe 21, and output pipe 22. The pipe ends are equipped with quick connectors that can be quickly connected to the top opening of the U-shaped sludge dredging pipe 10 to realize sewage suction, chemical dosing and solid-liquid separation operations.

[0032] The above embodiments employ distributed dredging technology, which achieves automated dredging of sludge from pipe networks through the coordinated matching of U-shaped dredging pipes and mobile dredging vehicles. Relying on the solid-liquid separation device mounted on the mobile dredging vehicle, the dredged sludge is intercepted and treated on-site, significantly reducing the overall amount of sludge generated from pipe networks, and reducing the pressure on end-of-pipe disposal and the risk of secondary pollution from transportation.

[0033] In a preferred embodiment of the present invention, the first driving device 17 is an electric push rod, which is fixedly installed in the middle of the rotating rod 14 by means of clamping or welding. The axis of the push rod is vertically downward. The spherical grinding plug 12 is connected to the electric push rod. The spherical contour is precisely fitted with the inner wall of the sedimentation port 11 to achieve sealing and isolation. The surface of the grinding plug is covered with wear-resistant rubber to improve the sealing life and cleaning and scraping effect.

[0034] As another preferred embodiment of the present invention, the adjustment device of this embodiment further includes a rotating rod 14 and a motor 15 connected to the rotating rod 14. The motor 15 can be a stepper motor, which is electrically connected to the power supply and communication unit. The rotating rod 14 is used to be installed laterally on the inner wall of the manhole a. The first drive device 17 is fixedly installed on the rotating rod 14.

[0035] In some embodiments, a garbage basket 16 is also included. The garbage basket 16 is installed inside the manhole a below the municipal pipe network and intercepts solid waste to prevent blockage of the sedimentation outlet 11. The garbage basket 16 may be a stainless steel mesh basket structure, suspended and installed below the municipal pipe network b inside the manhole a, located between the vertical sections of the U-shaped dredging pipe, to intercept solid waste such as leaves and plastic bags, preventing them from entering the sedimentation outlet 11 and causing blockage. A handle is provided at the top of the basket for easy periodic manual cleaning.

[0036] As another preferred embodiment of the present invention, this embodiment provides a targeted dredging method for urban pipe networks based on DOM fluorescence tracing, using the system described in any of the above claims. First, a garbage basket 16 is placed below the municipal pipe network b, the sedimentation port 11 is normally open, and the fluorescence probe 13 is powered on in real time. The dredging method includes routine dredging and deep dredging. When the water level in manhole a exceeds the municipal pipe network water level c, routine dredging is performed, including: A1. Close the sedimentation port 11; connect the input and output pipes of the mobile sludge removal vehicle to the two ports of the U-shaped sludge removal pipe 10 respectively; A2. Turn on the air compressor of the sludge removal truck and intermittently send air into the U-shaped sludge removal pipe 10 to mix the sewage and the sludge settled at the bottom of the U-shaped sludge removal pipe 10. Then quickly add the agent and intermittently send air to impact the sewage to cause rapid flocculation. A3. When the fluorescence intensity value meets the corresponding conditions, different solid-liquid methods are selected for dredging operations. The collection time range of the fluorescence probe 13 is 30 seconds to 2 minutes. During the dredging operation, the collection frequency of the fluorescence probe 13 is 1 to 5 times / second.

[0037] Experiments show that when the probe is set to high-frequency acquisition mode (e.g., 1–5 times / second), a short time typically refers to 30 seconds to 2 minutes. Within this time period, the fluorescence intensity value will exhibit multiple irregular sudden increases and decreases. When the coefficient of variation (CV) > 30%, it indicates that the overall dispersion and stability of the continuously acquired RFU values ​​are large. Furthermore, the variation amplitude between adjacent data points exceeding 50% is a direct basis for determining irregular sudden changes in the signal. Combining these two factors can accurately determine the conditions of strong interference during dredging.

[0038] On the other hand, when the water level in manhole a is lower than the municipal pipe network water level c, deep dredging is carried out, including: B1. Repeat steps A1 and A2, first ensuring that the U-shaped sludge removal pipe 10 is kept clean; B2. Start the motor 15 to drive the rotating rod 14 to rotate back and forth, so that the spherical grinding plug 12 cleans the bottom of the manhole. Then, the sewage is pumped through the U-shaped sludge removal pipe 10 to the deep cleaning suction limit. After that, the control adjustment device closes the sedimentation port 11 with the spherical grinding plug 12. B3. Add the agent into the U-shaped sludge removal pipe 10 and then pump it into the mobile sludge removal vehicle to complete the solid-liquid separation. B4. Repeat steps B2 and B3 until deep cleaning is complete.

[0039] It should be noted that the maximum height for deep cleaning and suction is between 20cm and 50cm below the manhole cover.

[0040] After cleaning is completed, if the fluorescent probe 13 is not completely submerged below the water level, the pre-stored clean water or reclaimed water is added to the manhole by a mobile sludge removal vehicle. This water is the liquid after solid-liquid separation by the mobile sludge removal vehicle, ensuring that the probe is always underwater and maintaining real-time monitoring.

[0041] In some embodiments, in step A3, when the fluorescence peak detected by the fluorescence probe 13 is within the following range, the wastewater is pumped into a mobile sludge removal vehicle and then treated using a screw press dewatering machine, a vacuum filtration device, or an ultrafiltration device: Peak A core parameter matching characteristics: peak height false height rate ≤10%, full width at half maximum (FWHM) broadening ≤5nm, CV ≤10%, adjacent variation amplitude ≤8%; Peak T core parameter matching characteristics: peak height false height rate ≤20%, FWHM broadening ≤10nm, CV ≤15%, adjacent variation amplitude ≤12%; Where CV is the coefficient of variation.

[0042] In some preferred embodiments, in step A3, when the fluorescence peak detected by the fluorescence probe 13 is within the following range, the wastewater is pumped into a mobile sludge removal vehicle and then treated using a centrifugal dewatering machine: Peak A core parameter matching characteristics: peak height false height rate ≥30%, full width at half maximum (FWHM) broadening ≥15nm, CV ≥30%, adjacent variation amplitude ≥20%; Peak T core parameter matching characteristics: peak height false height rate ≥50%, FWHM broadening ≥20nm, CV ≥35%, adjacent variation amplitude ≥30%; Where CV is the coefficient of variation.

[0043] It should be noted that the humic substance-like peak A (Ex254nm / Em450nm) and the protein-like peak T (Ex280nm / Em350nm) are both core targets for DOM recognition. When metal ions such as Fe³+ and Cu²+ bind to DOM, triggering fluorescence quenching, the fluorescence peaks exhibit characteristics of local attenuation, peak shape distortion, and proportional imbalance. The protein-like peak T (Ex280nm / Em350nm), which is most significantly affected by quenching, shows non-uniform intensity decay: the peak height may decrease directly by 30%-60%, or the peak's half-width may narrow while the peak height drops sharply, creating a significant intensity difference with the unquenched humic substance-like peak A. This patent utilizes the abnormal fluorescence peak state to calculate the SS range and the maximum adsorption capacity of DOM through gradient experiments, further calculating the appropriate solid-liquid separation method to increase the amount of deposited sludge removed from manhole dredging nodes and ensure that the dewatered water quality meets standards.

[0044] This invention overturns the traditional understanding that "severe signal fluctuations equal invalid interference" in fluorescence detection, transforming the irregular fluctuations in fluorescence intensity caused by high SS (suspended solids) into a determination of the dredging conditions of a U-shaped dredging tube. When the random scattering, sedimentation, and adsorption of a large number of suspended particles in the water sample within the U-shaped dredging tube are detected, causing irregular and severe fluctuations in the intensity signal of the DOM (dosage-induced fluorescence) characteristic peak, it can be determined that the dredging tube is ready for dredging and suction. This technology overcomes the limitation of traditional fluorescence detection that "severe signal fluctuations mean the loss of quantitative and qualitative analytical significance," transforming such interference signals into a prerequisite for determining dredging characteristics, thus opening up a completely new application direction for fluorescence detection technology in the field of pipeline dredging.

[0045] Regarding the selection and dosage of reagents in the treatment process, the table below provides a reference table for the core parameters of fluorescence peaks. Different wastewater treatment equipment, reagent types, and dosages can be selected based on the recommended range in this table.

[0046]

[0047] Example 1 In one treatment case, the SS was found to be <500mg / L after testing and calculation. PAC was selected as the agent and the dosage was 10-15mg / L.

[0048] The treatment process is as follows: First, the air compressor pushes the water flow to mix the mud and water in the U-shaped sludge removal pipe 10. Then, PAC is added for at least 2 minutes to allow the PAC hydrolysis products to adsorb SS and DOM, forming tiny flocs. The fluorescence probe initially determines that the SS concentration is in the range of [SS] < 500 mg / L. After rapid shaking for 5-10 times, it is directly sucked into the vehicle input pipe 21. The filtration separation equipment can achieve almost complete SS interception and DOM interception of about 50%.

[0049] Example 2 In another treatment case, the test results showed that 500 mg / L < SS < 3000 mg / L, so PFS was selected as the agent and the dosage was 20–30 mg / L.

[0050] The treatment process is as follows: First, the air compressor pushes the water flow to mix the mud and water in the U-shaped sludge cleaning pipe 10. Then, PFS is added to form dense flocs. When the SS concentration is initially determined to be in the range of 500mg / L < [SS] < 3000mg / L, the air compressor pushes the water flow in the U-shaped sludge cleaning pipe 10. After rapid shaking for 5-10 times, the water is directly sucked into the vehicle input pipe 21. The filter separation equipment can achieve almost complete SS interception and DOM interception of more than 55%.

[0051] Example 3 In another case, after testing and calculation, it was found that 3000mg / L≤SS<5000mg / L, and the drug price was selected as PAC+PFS combination, with an addition of 15mg / L PAC+15mg / L PFS.

[0052] The treatment process is as follows: First, the air compressor pushes the water flow to mix the mud and water in the U-shaped sludge cleaning pipe 10. Then, a compound inorganic coagulant is added to increase the floc density. When the initial determination is that the SS concentration is in the range of 3000mg / L≤[SS]<5000mg / L, the air compressor pushes the water flow in the U-shaped sludge cleaning pipe 10. After slight shaking for 5-10 times, it can be directly sucked into the vehicle input pipe 21. A centrifugal separation device, the horizontal screw centrifuge, is set with a speed of 4000–4500r / min. Combined with an ultrafiltration device, it can achieve SS rejection of more than 85% and DOM rejection of more than 50%.

[0053] Example 3 In another treatment case, the test results showed that SS ≥ 5000 mg / L. A combination of PAFC and CPAM was used, with a dosage of PAFC 40–50 mg / L + CPAM 0.5–0.8 mg / L.

[0054] The processing procedure is as follows: First, the air compressor pushes the water flow to mix the mud and water in the U-shaped sludge cleaning pipe 10. Then, PAFC is added to strongly adsorb SS particles. When the SS concentration is initially determined to be in the range of [SS]≥5000mg / L, the air compressor pushes the water flow in the U-shaped sludge cleaning pipe 10. After slight shaking for 5-10 times, it can be directly sucked into the vehicle input pipe 21. Centrifugal separation equipment such as a horizontal screw centrifuge is used with the speed set to 4500-5000r / min. Without filtration facilities, the differential adjustment function is turned on to discharge solid sludge in a timely manner. This can achieve SS retention of more than 90% and DOM retention of more than 10% mainly by adsorption technology.

[0055] In the above embodiments, addressing the technical pain points of high fine powder content in sludge after multiple screenings, the difficulty in accumulating pollutants due to the poor sedimentation of fine powder, and low resource utilization rate, this technology fully utilizes the characteristic of fine powder in sludge that it is difficult to settle. By precisely combining metal flocculants and DOM (dissolved organic matter) adsorbent materials, the synergistic effect of flocculation and adsorption is leveraged to compress and fix all kinds of pollutants (including pollutants carried by fine powder) in the sludge cake. After treatment with this technology, the sludge can form a stable solid form that meets incineration disposal standards and has resource utilization potential. At the same time, it reduces the amount of fine powder generated at the source, solving the problem of fine powder pollution control and significantly improving the resource utilization value of sludge.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A targeted dredging system for urban pipe networks based on DOM fluorescence tracing, characterized in that, It includes a U-shaped sludge removal pipe (10), the two pipe bodies of which are respectively installed on both sides of the manhole, and a sedimentation port (11) is opened on the pipe wall of the bend of the U-shaped sludge removal pipe (10); it also includes an adjustment device, which includes a first drive device (17) and a spherical grinding plug (12), and the adjustment device is used at least to close or open the sedimentation port (11) so that the U-shaped sludge removal pipe (10) and the manhole are isolated or connected; It also includes a control system, which includes: Controller: Used to receive water level data and spectral data collected by fluorescence probe (13), analyze peak height false height rate, half peak width broadening, CV value, adjacent variation amplitude parameters and match peak A / peak T threshold; Signal acquisition and sensing unit: includes a fluorescence probe (13) and a water level sensor, used to acquire DOM fluorescence spectrum and manhole water level, respectively; The execution drive unit includes an electromagnetic actuator for controlling the first drive device (17) to close or open the sedimentation port according to the controller instructions; Safety warning and alarm unit: used to monitor abnormal system conditions and trigger audible and visual alarms; Power supply and communication unit: Used to supply power to the system and enable local device communication and remote data uploading.

2. The targeted dredging system for urban pipeline networks based on DOM fluorescence tracing according to claim 1, characterized in that, It also includes a mobile sludge removal vehicle (20), which is equipped with an air compressor, power supply, screw press dewatering machine, vacuum filtration equipment, ultrafiltration equipment, horizontal screw centrifugal dewatering machine, input pipeline (21), and output pipeline (22).

3. The targeted dredging system for urban pipeline networks based on DOM fluorescence tracing according to claim 1, characterized in that: The first drive device (17) is an electric push rod, and the spherical grinding plug (12) is connected to the electric push rod.

4. The targeted dredging system for urban pipeline networks based on DOM fluorescence tracing according to claim 1, characterized in that: The adjustment device also includes a rotating rod (14) and a motor (15) connected to the rotating rod (14). The rotating rod (14) is used to rotate laterally and is installed on the inner wall of the manhole. The first drive device (17) is fixedly installed on the rotating rod (14).

5. The targeted dredging system for urban pipeline networks based on DOM fluorescence tracing according to claim 1, characterized in that: It also includes a garbage basket (16), which is installed in the manhole below the municipal pipeline and intercepts solid garbage to prevent blockage of the sedimentation port (11).

6. A targeted dredging method for urban pipe networks based on DOM fluorescence tracing, characterized in that, The system described in any one of claims 1-5 is used, with the garbage basket (16) placed below the municipal pipeline, the sedimentation port (11) normally open, and the fluorescent probe (13) powered on in real time; the dredging method includes daily dredging and deep dredging. When the water level in the manhole exceeds the water level of the municipal pipeline, daily dredging is carried out, including: A1. Close the sedimentation port (11); connect the input and output pipes of the mobile sludge removal vehicle to the two ports of the U-shaped sludge removal pipe (10) respectively; A2. Turn on the air compressor of the sludge cleaning vehicle and intermittently supply air into the U-shaped sludge cleaning pipe (10) to mix the sewage and the sludge settled at the bottom of the U-shaped sludge cleaning pipe (10). Then quickly add the agent and intermittently supply air to impact the sewage to cause rapid flocculation. A3. When the fluorescence intensity value meets the corresponding conditions, different solid-liquid methods are selected for dredging operations. The collection time range of the fluorescence probe (13) is 30 seconds to 2 minutes. During the dredging operation, the collection frequency of the fluorescence probe (13) is 1 to 5 times / second.

7. The targeted dredging method for urban pipe networks based on DOM fluorescence tracing according to claim 5, characterized in that: When the water level in the manhole is lower than the municipal pipe network water level, deep dredging should be carried out, including: B1. Repeat steps A1 and A2, first ensuring that the U-shaped sludge removal pipe (10) is kept clean; B2. Start the motor (15) to drive the rotating rod (14) to rotate back and forth, so that the spherical grinding plug (12) cleans the bottom of the manhole. Then, the sewage is pumped through the U-shaped sludge removal pipe (10) to the deep cleaning suction limit. The deep cleaning suction limit is between 20cm and 50cm below the manhole cover. Control the adjustment device to make the spherical grinding plug (12) close the sedimentation port (11). B3. Add the agent into the U-shaped sludge cleaning pipe (10) and then pump it into the mobile sludge cleaning vehicle to complete the solid-liquid separation; B4. Repeat steps B2 and B3 until deep cleaning is complete.

8. The targeted dredging method for urban pipe networks based on DOM fluorescence tracing according to claim 5 or 6, characterized in that: After cleaning, the fluorescent probe (13) is below the water level. If the water level is insufficient, the cleaning water source or regenerated water source is replenished by the mobile sludge removal vehicle (the liquid after solid-liquid separation is completed in the mobile sludge removal vehicle).

9. The targeted dredging method for urban pipe networks based on DOM fluorescence tracing according to claim 5, characterized in that: In step A3, when the fluorescence peak detected by the fluorescence probe (13) is within the following range, the sewage is pumped into a mobile sludge removal vehicle and then treated using a screw press dewatering machine, vacuum filtration equipment, or ultrafiltration equipment: Peak A core parameter matching characteristics: peak height false height rate ≤10%, full width at half maximum (FWHM) broadening ≤5nm, CV ≤10%, adjacent variation amplitude ≤8%; Peak T core parameter matching characteristics: peak height false height rate ≤20%, FWHM broadening ≤10nm, CV ≤15%, adjacent variation amplitude ≤12%; Where CV is the coefficient of variation.

10. The targeted dredging method for urban pipe networks based on DOM fluorescence tracing according to claim 5, characterized in that: In step A3, when the fluorescence peak detected by the fluorescence probe (13) is within the following range, the sewage is pumped into the mobile sludge removal vehicle and then treated by a centrifugal dewatering machine: Peak A core parameter matching characteristics: peak height false height rate ≥30%, full width at half maximum (FWHM) broadening ≥15nm, CV ≥30%, adjacent variation amplitude ≥20%; Peak T core parameter matching characteristics: peak height false height rate ≥50%, FWHM broadening ≥20nm, CV ≥35%, adjacent variation amplitude ≥30%; Where CV is the coefficient of variation.

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