Liquid hazardous waste collection and transport system and method

Abstract

The application provides a liquid hazardous waste collecting and transferring system and method, which comprises a control and management unit, a plurality of negative pressure collecting units, a plurality of branch negative pressure conveying pipelines, a plurality of main negative pressure conveying pipelines, a negative pressure power unit, a monitoring unit, a transferring device and a gas filtering device; each negative pressure collecting unit is connected with a branch negative pressure conveying pipeline, the plurality of branch negative pressure conveying pipelines are connected with the input end of a main negative pressure conveying pipeline, the output end of the main negative pressure conveying pipeline is connected with one end of the negative pressure power unit, the other end of the negative pressure power unit is connected with the transferring device and the gas filtering device respectively, and the monitoring unit comprises a plurality of monitoring sensors arranged on the main negative pressure conveying pipeline and the negative pressure power unit. The application solves the problems that the liquid hazardous waste collecting and loading and unloading in the prior art depend on manual operation, the whole process is not monitored, the positive pressure conveying mode has leakage hidden dangers, and the pollution diffusion speed is high after leakage.

Description

Technical Field

[0001] This invention relates to the field of hazardous waste treatment, and more particularly to a system and method for collecting and transferring liquid hazardous waste. Background Technology

[0002] Currently, the conventional treatment methods for liquid hazardous waste by enterprises mainly fall into two categories: one is to directly pour the generated liquid hazardous waste into collection containers or temporary storage tanks, obtain approval procedures when necessary, and then transport it by vehicle to an external disposal unit; the other is to collect the liquid hazardous waste into containers and then manually transport it to a hazardous waste warehouse for weighing, coding, and storage. Both of these methods require a large amount of manpower, and leaks are prone to occur during handling and transportation, posing a risk of polluting the external environment. To address the aforementioned issues, existing technologies also employ positive pressure conveying to automate the collection and transfer of liquid hazardous waste. This involves temporarily storing the liquid hazardous waste generated by the waste-generating unit in an intermediate tank, then using booster pumps and flow meters to control its transport through pipelines to storage tanks, internal utilization units, or external disposal units. Simultaneously, temperature and level sensors, along with video monitoring, are used to monitor the storage tank's operational status in real time, enabling continuous and automated collection and transfer of liquid hazardous waste. This reduces manual loading and unloading, registration and approval processes, and vehicle transfer procedures, thereby mitigating the risk of hazardous waste leakage and environmental pollution. However, the existing models for the collection, transportation, and management of liquid hazardous waste still have many shortcomings: First, the collection and unloading of liquid hazardous waste rely on manual operation, which can easily cause environmental pollution and harm to personnel during the collection, transportation, and transfer process; second, the operating status and storage conditions of storage tanks lack real-time and effective monitoring, making it difficult to accurately grasp the storage status of hazardous waste; third, the positive pressure transportation method has the potential for leakage, and once leakage occurs, the pollution spreads rapidly, posing a high environmental risk. Summary of the Invention

[0003] Based on the above problems, this invention proposes a liquid hazardous waste collection and transfer system and method, which solves the problem that the collection and unloading of liquid hazardous waste in the prior art relies on manual operation, solves the problem that there is no monitoring in the whole process, solves the problem that the positive pressure transportation method has the risk of leakage, and that the pollution spreads quickly after leakage occurs, resulting in a high environmental risk.

[0004] This invention proposes a liquid hazardous waste collection and transfer system, comprising: The control and management unit, along with multiple negative pressure collection units, multiple branch negative pressure delivery pipelines, multiple main negative pressure delivery pipelines, a negative pressure power unit, a monitoring unit, a transfer device, and a filtration device, all connected to the control and management unit, have fewer branch negative pressure delivery pipelines than main negative pressure delivery pipelines. Each negative pressure collection unit is connected to a branch negative pressure delivery pipeline. Multiple branch negative pressure delivery pipelines are connected to the input end of a main negative pressure delivery pipeline. The output end of the main negative pressure delivery pipeline is connected to one end of the negative pressure power unit. The other end of the negative pressure power unit is connected to the transfer device and the air filtration device respectively. The monitoring unit includes multiple monitoring sensors installed on the main negative pressure delivery pipeline and the negative pressure power unit. During operation, the negative pressure power unit provides negative pressure power to the negative pressure collection unit through the main negative pressure conveying pipeline and branch negative pressure conveying pipelines. This allows the negative pressure collection unit, located at the point of liquid hazardous waste generation, to collect the liquid hazardous waste under negative pressure. The liquid hazardous waste is then transferred to the main negative pressure conveying pipeline through the branch negative pressure conveying pipelines. The main negative pressure conveying pipeline collects the liquid hazardous waste into the negative pressure power unit, which then discharges the liquid hazardous waste to the transfer device and transports the gaseous waste gas to the gas filtration device. The control and management unit receives signals from the monitoring unit and controls the system operation according to the signals.

[0005] In addition, the negative pressure collection unit includes: a pressure sensing device, a collection chamber, a controller, a delivery pipe, a delivery valve, and a negative pressure power pipe; The lower end of the pressure sensing device is set in the collection chamber, and the upper end is connected to the input end of the controller. The output end of the controller is connected to the input end of the delivery valve and the negative pressure power pipe respectively. The output end of the negative pressure power pipe is connected to the input end of the main negative pressure delivery pipeline. The lower end of the delivery pipe is connected to the collection chamber, and the upper end is connected to the negative pressure power pipe. The delivery valve is set in the pipeline of the delivery pipe. External liquid hazardous waste enters the collection chamber through the inlet. The controller receives the pressure value detected by the pressure sensor in the collection chamber. If the pressure value is higher than the pressure threshold, the negative pressure power pipe is activated, the delivery valve is opened, and the negative pressure power pipe draws liquid from the collection chamber to the branch negative pressure delivery pipeline.

[0006] In addition, the negative pressure collection unit also includes: a ventilation valve check ball and a ventilation valve; The ventilation valve is installed on the side wall or top of the collection chamber. One end of the ventilation valve is connected to the inside of the collection chamber, and the other end is open to the outside atmosphere. The check ball of the ventilation valve is located in the ventilation channel inside the ventilation valve, allowing outside air to enter the collection chamber and preventing gas or liquid in the collection chamber from flowing out in reverse.

[0007] In addition, the pressure sensing device is a pressure sensing tube, the controller is a vacuum control unit, the delivery valve is a vacuum duckbill valve, the pressure sensing tube is connected to the input end of the vacuum control unit through a pressure sensing line, the output end of the vacuum control unit is connected to the negative pressure power tube through a power negative pressure line, and is connected to the vacuum duckbill valve through the controller output line; Liquid hazardous waste enters the collection chamber through the inlet. When the vacuum control unit detects that the pressure value in the pressure sensing tube is higher than the set pressure threshold, the vacuum control unit activates the negative pressure power tube to create negative pressure in the conveying tube. The vacuum duckbill valve opens automatically under the action of negative pressure, and the liquid hazardous waste is drawn into the negative pressure power tube through the conveying tube.

[0008] In addition, the negative pressure power unit includes: an intermediate storage tank, a connecting pipe, a negative pressure tank, a drain pump, and a negative pressure pump; The intermediate storage tank and the negative pressure tank are connected by a connecting pipe. The outlet of the intermediate storage tank is connected to one end of the drain pump, and the other end of the drain pump is connected to the transfer device. The outlet of the negative pressure tank is connected to one end of the negative pressure pump, and the other end of the negative pressure pump is connected to the air filtration device. After the negative pressure pump starts, it generates negative pressure, which is transmitted to the main negative pressure delivery pipeline, branch negative pressure delivery pipeline and negative pressure collection unit through the negative pressure tank, connecting pipe and intermediate storage tank; After the liquid hazardous waste collected by the negative pressure collection unit is transferred to the intermediate storage tank, the liquid flows through the drain pump 7 to the transfer device, and the gas is transferred to the gas filtration device through the negative pressure pump.

[0009] In addition, the monitoring unit includes: a main negative pressure pipe pressure gauge and a main negative pressure pipe thermometer installed on the main negative pressure delivery pipeline; a negative pressure tank pressure gauge and a negative pressure tank thermometer installed on the negative pressure tank; an intermediate storage tank level gauge and an intermediate storage tank thermometer installed on the intermediate storage tank; a discharge flow meter installed at the output end of the discharge pump; and a negative pressure pump flow meter installed at the output end of the negative pressure pump.

[0010] In addition, the system also includes: a buffer unit at the front end of the negative pressure collection unit, a branch negative pressure pipeline valve before the branch negative pressure pipeline is connected to the main negative pressure pipeline, and a main negative pressure pipeline valve before the main negative pressure pipeline is connected to the negative pressure power unit.

[0011] In addition, at preset intervals, the pipes of the branch negative pressure delivery pipeline and / or the main negative pressure delivery pipeline are bent downwards to form liquid traps.

[0012] The present invention also proposes a method for collecting and transferring liquid hazardous waste using the liquid hazardous waste collection and transfer system described in any of the preceding claims, comprising: At the point of liquid hazardous waste generation, the liquid hazardous waste is automatically collected by a negative pressure collection unit; When liquid hazardous waste is transferred, the weight of the liquid hazardous waste in the transfer device is automatically obtained through the metering module; Automatically generate and print QR code labels based on the weight and other information of the liquid hazardous waste; Link the QR code label to its corresponding liquid hazardous waste; Automatically generate electronic ledgers for liquid hazardous waste and upload them to the liquid hazardous waste management system.

[0013] In addition, the method also includes risk warning; if the data collected by the monitoring unit is identified as abnormal, a warning message is issued.

[0014] This invention solves the problems of manual operation in the collection and unloading of liquid hazardous waste in existing technologies, the lack of monitoring throughout the process, and the potential for leakage in positive pressure conveying methods, which also lead to rapid pollution spread and high environmental risks after leakage. The liquid hazardous waste collection and transfer system provided by this invention automates the entire collection and transportation process, and allows for monitoring of the state of the liquid hazardous waste at different locations within the system. Furthermore, by employing the principle of negative pressure liquid suction, electronic components are not required during suction, avoiding frequent malfunctions of electronic components due to moisture. Attached Figure Description

[0015] Figure 1 A schematic diagram of a liquid hazardous waste collection and transfer system provided in one embodiment of the present invention; Figure 2 A schematic diagram of a negative pressure collection unit provided in one embodiment of the present invention; Figure 3 A schematic diagram of a liquid storage bay provided in one embodiment of the present invention; Figure 4 A flowchart illustrating a method for collecting and transferring liquid hazardous waste according to an embodiment of the present invention; Figure label: 1 Negative pressure collection unit, 2 Branch negative pressure delivery pipeline, 3 Main negative pressure delivery pipeline, 4 Intermediate storage tank, 5 Connecting pipe, 6 Negative pressure tank, 7 Drain pump, 8 Inlet valve of the drain pump, 9 Drain pump outlet check valve, 10 Discharge pump outlet valve, 11 negative pressure pump, 12 Negative pressure pump inlet valve, 13 Negative pressure pump outlet check valve, 14 Negative pressure pump outlet valve, 15 Transfer device, 16 Filtering device, 17 Drain pump inlet pipeline, 18 Drainage pump outlet pipeline, 19 Negative pressure pump inlet pipeline, 20 Negative pressure pump outlet pipeline, 21 Branch negative pressure pipeline valve, 22 Main negative pressure pipeline valves, 23 Connecting pipe valve, 24 Main negative pressure pipe pressure gauge, 25 Main negative pressure pipe thermometer, 26 Negative pressure tank pressure gauge, 27 Negative pressure tank thermometer, 28 Intermediate storage tank level gauge, 29 intermediate storage tank thermometer, 30 Drainage flow meter, 31 Negative pressure pump flow meter, 51 Imported, 52 Pressure sensor tube, 53 Collection room, 54 Controller output line, 55 delivery pipe, 56 Pressure sensing wire, 57 Ventilation valve check ball, 58 Ventilation valve, 59 Controller, 60 Delivery valve, 61 Power negative pressure line, 62 Negative pressure power pipe, 63 Bag type. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. This description is intended only to illustrate specific embodiments of the invention and does not constitute any limitation on the invention. The scope of protection of the invention is defined by the claims.

[0017] Reference Figure 1 This invention proposes a liquid hazardous waste collection and transfer system, comprising: The control and management unit, along with multiple negative pressure collection units 1, multiple branch negative pressure delivery pipelines 2, multiple main negative pressure delivery pipelines 3, a negative pressure power unit, a monitoring unit, a transfer device 15, and a filter device 16, all connected to the control and management unit. The number of branch negative pressure delivery pipelines 2 is less than the number of main negative pressure delivery pipelines 3. Each negative pressure collection unit 1 is connected to a branch negative pressure delivery pipeline 2. Multiple branch negative pressure delivery pipelines 2 are connected to the input end of a main negative pressure delivery pipeline 3. The output end of the main negative pressure delivery pipeline 3 is connected to one end of the negative pressure power unit. The other end of the negative pressure power unit is connected to the transfer device 15 and the air filtration device 16 respectively. The monitoring unit includes multiple monitoring sensors installed on the main negative pressure delivery pipeline 3 and the negative pressure power unit. During operation, the negative pressure power unit provides negative pressure power to the negative pressure collection unit 1 through the main negative pressure conveying pipeline 3 and the branch negative pressure conveying pipeline 2, so that the negative pressure collection unit 1, which is set at the point of liquid hazardous waste generation, collects liquid hazardous waste through negative pressure. The liquid hazardous waste is then transferred to the main negative pressure conveying pipeline 3 through the branch negative pressure conveying pipeline 2. The main negative pressure conveying pipeline 3 collects the liquid hazardous waste into the negative pressure power unit, and the negative pressure power unit discharges the liquid hazardous waste to the transfer device 15 and transports the gaseous waste gas to the gas filtration device 16. The control and management unit receives signals from the monitoring unit and controls the system operation according to the signals.

[0018] The negative pressure power unit provides negative pressure to the entire system. The generated negative pressure is transmitted to the negative pressure collection unit 1 through the main negative pressure transmission pipeline 3 and the branch negative pressure transmission pipeline 2. Optionally, the negative pressure is provided continuously or periodically.

[0019] Optionally, refer to Figure 2 The negative pressure collection unit 1 includes: a pressure sensing device, a collection chamber 53, a controller 59, a conveying pipe 55, a conveying valve 60, and a negative pressure power pipe 62. The lower end of the pressure sensing device is located inside the collection chamber 53, and the upper end is connected to the input end of the controller 59. The output end of the controller 59 is connected to the input end of the conveying valve 60 and the negative pressure power pipe 62, respectively. The output end of the negative pressure power pipe 62 is connected to the input end of the main negative pressure conveying pipeline. The lower end of the conveying pipe 55 is connected to the collection chamber 53, and the upper end is connected to the negative pressure power pipe 62. The conveying valve 60 is located in the pipe of the conveying pipe 55. External liquid hazardous waste enters the collection chamber 53 through the inlet 51 of the collection chamber 53. The controller 59 receives the pressure value detected by the pressure sensing device in the collection chamber 53. If the pressure value is higher than the pressure threshold, the negative pressure power pipe 62 is activated, the conveying valve 60 is opened, and the negative pressure power pipe 62 draws liquid from the collection chamber 53 from the conveying pipe 55 to the branch negative pressure conveying pipeline.

[0020] The internal pressure sensing device of the negative pressure collection unit 1 monitors the pressure value of the collection chamber 53. If the pressure value is higher than the pressure threshold, the negative pressure power pipe 62 is activated, the delivery valve 60 is opened, and the negative pressure power pipe 62 draws the liquid from the collection chamber 53 to the branch negative pressure delivery pipeline from the delivery pipe 55.

[0021] The monitoring unit is responsible for monitoring whether the entire system is operating normally, such as monitoring whether the temperature of the main negative pressure delivery pipeline 3 is normal. The monitoring unit contains sensors such as pressure sensors, temperature sensors, and flow sensors.

[0022] Optionally, the control and management unit can be a programmable logic controller (PLC), a microcontroller, a personal computer, a distributed control system, etc. Optionally, the personal computer's operating system uses the Android system and mainly includes management system software.

[0023] Optionally, the transfer device 15 is a transfer tank, and the filtration device 16 is a biological filtration tank. Optionally, the biological filtration tank adopts a layered filtration method, mainly including gravel, pebbles, crushed stone, activated carbon, peat, crushed bark, vegetation, etc.

[0024] This invention employs a negative pressure control method. By opening and closing the terminal negative pressure collection unit 1, liquid hazardous waste is drawn into the branch negative pressure conveying pipeline 2. No electrical components are required on the terminal negative pressure collection unit 1, thus avoiding the problem of frequent malfunctions of electronic components due to the humid working environment, which affects operations. Because pure liquid experiences high friction within the pipe during transport, negative pressure is rapidly depleted. The negative pressure collection unit 1 introduces air; the air bubbles support the liquid, reducing friction between the liquid and the pipeline, and thus assisting in the transport of liquid hazardous waste.

[0025] Liquid hazardous waste is transported to the negative pressure power unit via branch negative pressure transport pipeline 2 and main negative pressure transport pipeline 3. The collected liquid hazardous waste is then transported to transfer device 15 or other equipment, while the collected air is discharged to air filtration device 16, thereby reducing the environmental pollution and odor problems that may occur during the transport of liquid hazardous waste. The air filtration device 16 purifies the gas before discharging it.

[0026] This invention solves the problems of manual operation in the collection and unloading of liquid hazardous waste in existing technologies, the lack of monitoring throughout the process, and the potential for leakage in positive pressure conveying methods, which also lead to rapid pollution spread and high environmental risks after leakage. The liquid hazardous waste collection and transfer system provided by this invention automates the entire collection and transportation process, and allows for monitoring of the state of the liquid hazardous waste at different locations within the system. Furthermore, by employing the principle of negative pressure liquid suction, electronic components are not required during suction, avoiding frequent malfunctions of electronic components due to moisture.

[0027] Reference Figure 2 In one embodiment, the negative pressure collection unit includes: a pressure sensing device, a collection chamber 53, a controller 59, a delivery pipe 55, a delivery valve 60, and a negative pressure power pipe 62; The lower end of the pressure sensing device is set in the collection chamber 53, and the upper end is connected to the input end of the controller 59. The output end of the controller 59 is connected to the input end of the delivery valve 60 and the negative pressure power pipe 62 respectively. The output end of the negative pressure power pipe 62 is connected to the input end of the main negative pressure delivery pipeline. The lower end of the delivery pipe 55 is connected to the collection chamber 53, and the upper end is connected to the negative pressure power pipe 62. The delivery valve 60 is set in the pipeline of the delivery pipe 55. External liquid hazardous waste enters the collection chamber 53 through the inlet 51. The controller 59 receives the pressure value inside the collection chamber 53 detected by the pressure sensing device. If the pressure value is higher than the pressure threshold, the negative pressure power pipe 62 is activated, the delivery valve 60 is opened, and the negative pressure power pipe 62 draws liquid from the collection chamber 53 to the branch negative pressure delivery pipeline 2 from the delivery pipe 55.

[0028] This embodiment uses a pressure sensing device to monitor the liquid level in the collection chamber in real time. When the threshold is reached, negative pressure suction of liquid hazardous waste is automatically initiated, and when the level falls below the threshold, it automatically stops, requiring no manual intervention. The entire process uses negative pressure closed-loop transportation, effectively preventing leakage, volatilization, and odor diffusion of liquid hazardous waste, avoiding environmental pollution and harm to human health, and meeting the safety regulations for hazardous waste treatment. Suction is achieved solely through the linkage of pressure sensing, controller, delivery valve, and negative pressure power pipe, resulting in a simple structure, low failure rate, and adaptability to various scenarios for liquid hazardous waste collection. Negative pressure is activated only when the liquid level in the collection chamber reaches the standard, avoiding energy consumption during idling. The pressure threshold can be flexibly adjusted according to the type of hazardous waste and the collection volume.

[0029] In one embodiment, the negative pressure collection unit further includes: a ventilation valve check ball 57 and a ventilation valve 58; Ventilation valve 58 is installed on the side wall or top of collection chamber 53. One end of ventilation valve 58 is connected to the inside of collection chamber 53, and the other end is connected to the outside atmosphere. Ventilation valve check ball 57 is located in the ventilation channel inside ventilation valve 58, allowing outside air to enter collection chamber 53 and preventing gas or liquid in collection chamber 53 from flowing out in reverse.

[0030] During negative pressure suction, a vacuum is formed in the collection chamber. The ventilation valve can introduce external air to prevent the liquid from not flowing or the suction efficiency from decreasing due to excessive internal vacuum. The ventilation valve check ball 57 has a one-way structure, allowing only air to enter. This effectively prevents liquid hazardous waste, toxic gases, or odors in the collection chamber from leaking or flowing back out through the ventilation opening. It also prevents the collection chamber from deforming or being damaged due to excessive negative pressure, while preventing liquid from flowing back into the negative pressure pipeline, thus protecting downstream equipment. Automatic opening and closing is achieved using gravity and air pressure difference, requiring no electricity, resulting in a low failure rate and suitability for the harsh working conditions of hazardous waste treatment.

[0031] In one embodiment, the pressure sensing device is a pressure sensing tube 52, the controller 59 is a vacuum control unit, the delivery valve 60 is a vacuum duckbill valve, the pressure sensing tube 52 is connected to the input end of the vacuum control unit through a pressure sensing line 56, the output end of the vacuum control unit is connected to the negative pressure power tube 62 through a power negative pressure line 61, and is connected to the vacuum duckbill valve through a controller output line 54. Liquid hazardous waste enters the collection chamber 53 through the inlet 51. When the vacuum control unit detects that the pressure value in the pressure sensing tube 52 is higher than the set pressure threshold, the vacuum control unit activates the negative pressure power tube 62 to create a negative pressure in the delivery tube 55. The vacuum duckbill valve opens automatically under the action of negative pressure, and the liquid hazardous waste is drawn into the negative pressure power tube 62 through the delivery tube 55.

[0032] The system uses a pressure sensor to directly collect the internal air pressure, and changes in liquid level are directly reflected in pressure changes. The vacuum duckbill valve does not require separate electrical control; it automatically opens based on the negative pressure formed in the delivery pipe, avoiding suction failure caused by malfunctions of the electrically controlled valve. The vacuum control unit forms a closed-loop control system of "pressure detection—negative pressure start—valve opening—liquid delivery".

[0033] In one embodiment, the negative pressure power unit includes: an intermediate storage tank 4, a connecting pipe 5, a negative pressure tank 6, a drain pump 7, and a negative pressure pump 11; Intermediate storage tank 4 and negative pressure tank 6 are connected by connecting pipe 5. The output port of intermediate storage tank 4 is connected to one end of drainage pump 7, and the other end of drainage pump 7 is connected to transfer device. The output port of negative pressure tank 6 is connected to one end of negative pressure pump 11, and the other end of negative pressure pump 11 is connected to air filtration device. After the negative pressure pump 11 starts, it generates negative pressure, which is transmitted to the main negative pressure delivery pipeline, the branch negative pressure delivery pipeline and the negative pressure collection unit through the negative pressure tank 6, the connecting pipe 5 and the intermediate storage tank 4. After the liquid hazardous waste collected by the negative pressure collection unit is transferred to the intermediate storage tank 4, the liquid flows through the drain pump 7 to the transfer device, and the gas is transferred to the gas filtration device through the negative pressure pump 11.

[0034] Optionally, the inlet of the discharge pump 7 is equipped with a discharge pump inlet valve 8, and the outlet is equipped with a discharge pump outlet check valve 9. The discharge pump inlet valve 8 can disconnect the intermediate storage tank 4 from the discharge pump 7 and control the flow rate of liquid hazardous waste entering the discharge pump. The discharge pump outlet check valve 9 can prevent liquid backflow.

[0035] Optionally, the inlet of the negative pressure pump 11 is also equipped with a negative pressure pump inlet valve 12, and the outlet is equipped with a negative pressure pump outlet check valve 13 and a negative pressure pump outlet valve 14, which, in conjunction with the start and stop of the negative pressure pump, control the flow of gas. The negative pressure pump outlet check valve 13 effectively prevents the backflow of gas, liquid, or impurities from the filtration device side. The negative pressure pump outlet valve 14, in conjunction with the outlet check valve 13, assists in regulating the outlet airflow pressure. In case of abnormalities (such as excessive pressure or gas leakage), this valve can be quickly closed for emergency shut-off to prevent the spread of risk.

[0036] Optionally, the discharge pump 7 is further equipped with a discharge pump inlet line 17 and a discharge pump outlet line 18. The discharge pump inlet line 17 ensures stable delivery of liquid hazardous waste. The inlet line is typically designed to be short, straight, and thick, minimizing bends and valves to reduce suction resistance. A filter (screen) is installed on this line to prevent impurities from entering the pump body and damaging the impeller. The discharge pump outlet line 18 prevents liquid from flowing back into the pump body and causing damage when the pump stops, and regulates the flow rate and pressure.

[0037] Optionally, a negative pressure pump inlet pipeline 19 and a negative pressure pump outlet pipeline 20 are also provided before and after the negative pressure pump.

[0038] The intermediate storage tank, connecting pipes, negative pressure tank, drain pump, and negative pressure pump constitute the negative pressure power source of the system. Intermediate storage tanks, connecting pipes, and negative pressure tanks are made of materials suitable for storing liquid hazardous waste, or are protected against corrosion using processes such as carbon steel lined with rubber, enamel, or plastic.

[0039] Optionally, the intermediate storage tank and the negative pressure tank are made of cladding or stainless steel; the liquid level inside the intermediate storage tank is between 10-50% of the tank's volume.

[0040] Optionally, a metering pump or a corrosion-resistant pump can be used as the drainage pump, and an oil-free vacuum pump can be used as the negative pressure pump.

[0041] Optionally, the negative pressure in the intermediate storage tank and the negative pressure tank is set at 0.6-0.8 bar.

[0042] In one embodiment, the monitoring unit includes: a main negative pressure pipe pressure gauge 24 and a main negative pressure pipe thermometer 25 installed on the main negative pressure delivery pipeline; a negative pressure tank pressure gauge 26 and a negative pressure tank thermometer 27 installed on the negative pressure tank 6; an intermediate storage tank level gauge 28 and an intermediate storage tank thermometer 29 installed on the intermediate storage tank; a discharge flow meter 30 installed at the output end of the discharge pump 7; and a negative pressure pump flow meter 31 installed at the output end of the negative pressure pump 11.

[0043] This embodiment enables real-time sensing of pressure, temperature, and flow data throughout the entire process of collecting and transporting liquid hazardous waste, ensuring that the entire negative pressure conveying system can operate safely, stably, and efficiently.

[0044] The main negative pressure pipe pressure gauge 24 monitors the negative pressure value in the main negative pressure conveying pipeline to determine whether the suction force is sufficient; it prevents the material from being conveyed poorly due to low pressure, or the system from failing due to high pressure (close to atmospheric pressure).

[0045] The main negative pressure pipe thermometer 25 monitors the temperature during the transportation of liquid hazardous waste to prevent deterioration, volatilization or damage to the pipeline due to high temperature, and solidification and blockage of the pipeline due to low temperature.

[0046] The pressure gauge 26 of the negative pressure tank is used to monitor the vacuum pressure inside the negative pressure tank to ensure that the set negative pressure is maintained inside the tank and that the material can be sucked in.

[0047] The negative pressure tank thermometer 27 is used to monitor the temperature inside the negative pressure tank to prevent the liquid from overheating and boiling or overcooling and crystallizing.

[0048] The intermediate storage tank level gauge 28 is used to monitor the height of the liquid hazardous waste in the intermediate storage tank. When the liquid level is too high, the linkage drain pump 7 increases the discharge volume to prevent liquid overflow; when the liquid level is too low, the linkage drain pump 7 stops or slows down to prevent the pump from running dry and burning out.

[0049] The intermediate storage tank thermometer 29 is used to monitor the temperature of liquid hazardous waste in the intermediate storage tank.

[0050] The discharge flow meter 30 is used to monitor the flow rate of the discharged liquid, adjust the speed of the discharge pump, and maintain the liquid level balance in the intermediate tank.

[0051] The negative pressure pump flow meter 31 is used to monitor the air flow rate and determine the working efficiency of the negative pressure pump. Abnormal flow rate may indicate pump failure or system leakage.

[0052] Optionally, the intermediate storage tank and the negative pressure tank are marked with basic information, which is used to mark the basic data of the intermediate storage tank and the negative pressure tank, as well as the liquid hazardous waste transportation process and set process parameters. The transfer manifest record records the discharge from the intermediate storage tank to the transfer tank.

[0053] In one embodiment, the system further includes: a buffer unit at the front end of the negative pressure collection unit 1; a branch negative pressure pipeline valve 21 before the branch negative pressure delivery pipeline 2 connects to the main negative pressure delivery pipeline 3; and a main negative pressure pipeline valve 22 before the main negative pressure delivery pipeline 3 connects to the negative pressure power unit. Optionally, a shut-off valve is connected to the top or upper part of the intermediate storage tank 4, and a drain pump 7 is connected to the bottom or lower part of the intermediate storage tank 4. Optionally, the shut-off valve is a connecting pipe valve 23 installed on the connecting pipe 5. The top shut-off valve can control the air intake and depressurization of the intermediate storage tank 4, balance the pressure inside the tank, and prevent excessive negative pressure or excessive air intake inside the tank.

[0054] The buffer unit can stabilize the airflow fluctuations at the front end of the negative pressure collection unit 1, and prevent material impact and airflow pulsation from impacting the negative pressure collection unit 1.

[0055] The branch negative pressure pipeline valve 21 and the main negative pressure pipeline valve 22 can independently open and close the branch negative pressure transmission pipeline 2 and the main negative pressure transmission pipeline 3, and regulate the flow rate. This facilitates regional maintenance and start-up / shutdown, and avoids the impact of a single branch failure on the operation of the entire negative pressure transmission system. Optionally, the valves are gate valves.

[0056] The negative pressure collection unit collects liquid hazardous waste by gravity flow and, through the controller of the negative pressure collection unit, uses pressure to intermittently transport the liquid hazardous waste to branch conveying pipelines and main conveying pipelines; then to intermediate storage tanks, and finally to transfer devices.

[0057] Branch negative pressure pipeline valve 21 and main negative pressure pipeline valve 22 are soft-seal gate valves, and the valve plate wrapping is selected according to the type of liquid hazardous waste; the preferred soft-seal gate valve has no grooves inside.

[0058] In one embodiment, the pipes of the branch negative pressure delivery pipeline 2 and / or the main negative pressure delivery pipeline 3 are bent downwards at preset intervals to form liquid traps.

[0059] Optionally, bag-type 63 lifting devices are used at intervals on the branch negative pressure conveying pipeline 2 and / or the main negative pressure conveying pipeline 3. Because the pipeline is very long when conveying over long distances, problems such as large negative pressure loss and inability to pump liquid are likely to occur. The liquid trap (bag type) can allow the liquid to naturally settle at the bottom of the trap, forming a liquid seal, and maintaining stable negative pressure without leakage.

[0060] This embodiment can form a stable liquid seal in the pipeline to prevent negative pressure leakage and gas short circuit, effectively utilize the negative pressure provided by the negative pressure tank 6, reduce pressure loss along the pipeline, and thus realize long-distance negative pressure transportation of liquid hazardous waste.

[0061] Optionally, in the material selection and connection process of the branch negative pressure conveying pipeline 2 and the main negative pressure conveying pipeline 3, the characteristics of the liquid hazardous waste should be fully considered. High-density polyethylene (HDPE) and rigid polyvinyl chloride (UPVC) pipes are generally selected as the negative pressure conveying pipelines. Other materials, such as stainless steel pipes, can also be considered, but their price will be higher. Regarding the connection process of the negative pressure conveying pipelines, the pipelines are required to meet the following characteristics: smooth inner wall, low frictional resistance, and the ability to withstand a negative pressure of not less than 0.07 MPa. At the same time, there are also certain requirements for the connection method of the negative pressure conveying pipelines: good sealing, no protrusions at the connection points, easy on-site processing and assembly, and long service life.

[0062] Branch negative pressure delivery pipeline 2 and main negative pressure delivery pipeline 3 are controlled by the control and management unit and can be managed in real time in the background through the control and management unit.

[0063] Bag-type liquid traps are installed every 20-30 meters in the negative pressure delivery pipeline to achieve long-distance negative pressure delivery; preferably, bag-type liquid traps are installed every 25 meters.

[0064] Reference Figure 3 The present invention also proposes a method for collecting and transferring liquid hazardous waste using the liquid hazardous waste collection and transfer system described in any of the preceding claims, comprising: Step S001: At the point where the liquid hazardous waste is generated, the liquid hazardous waste is automatically collected by a negative pressure collection unit; Step S002: When the liquid hazardous waste is transferred, the weight of the liquid hazardous waste in the transfer device is automatically obtained through the metering module; Step S003: Automatically generate and print QR code labels based on the weight of the liquid hazardous waste and other information; Step S004: Bind the QR code label to its corresponding liquid hazardous waste; Step S005: Automatically generate an electronic ledger for liquid hazardous waste and upload it to the liquid hazardous waste management system.

[0065] Optionally, the metering module is a metering pump, and the discharge pump 7 is also a metering pump. The weight of the liquid hazardous waste can be obtained by acquiring data from the discharge pump 7. The metering pump automatically transmits the data to the control and management unit or an external management system, or automatically sends a transfer order to the staff.

[0066] This invention solves the problems of manual operation in the collection and unloading of liquid hazardous waste in existing technologies, the lack of monitoring throughout the process, and the potential for leakage in positive pressure conveying methods, which also lead to rapid pollution spread and high environmental risks after leakage. The liquid hazardous waste collection and transfer system provided by this invention automates the entire collection and transportation process, and allows for monitoring of the state of the liquid hazardous waste at different locations within the system. Furthermore, by employing the principle of negative pressure liquid suction, electronic components are not required during suction, avoiding frequent malfunctions of electronic components due to moisture.

[0067] This invention solves the problems in the existing technology of cumbersome approval processes for generation, storage, transportation, and disposal, which are mostly done manually, resulting in poor information sharing and insufficient supervision, large gaps in data such as the amount of hazardous waste generated, stored, and treated, and low overall disposal efficiency. It also solves the problems of data being easily interfered with by humans and the inability to guarantee accuracy. Furthermore, it solves the problems of data delays and extraction errors that are prone to occur in manual record keeping, resulting in poor data validity.

[0068] In one embodiment, the method further includes a risk warning, which issues a warning message if the data collected by the monitoring unit is identified as abnormal.

[0069] Risk warnings are used to monitor environmental temperature, internal pressure, liquid level, and storage expiration. When the collected data is identified as abnormal, such as when the detected parameter value exceeds the set value, a warning message is issued.

[0070] Hazardous waste: Hazardous waste refers to waste that has hazardous characteristics such as corrosivity, toxicity, flammability, reactivity, or infectivity.

[0071] Negative pressure: Below the existing atmospheric pressure or below its rarefaction, generally providing a negative pressure of 0~1 bar.

[0072] Optionally, the liquid hazardous waste applicable to this embodiment mainly includes hazardous waste with low liquid viscosity, and is not applicable to high-viscosity liquid hazardous waste such as oils.

[0073] The liquid hazardous waste collection and transfer methods also record basic information: the enterprise account and permission configuration module is used to configure the account's operation and / or viewing rights, and the scope of operation / viewing permissions. The storage tank basic information is used to set the basic data of intermediate storage tanks and negative pressure tanks, the liquid hazardous waste transportation process is displayed and the process parameters are set, and the transfer manifest record records the discharge from the intermediate storage tank to the transfer tank; Risk warning includes: relying on the monitoring system and ledger management system, pushing warning information to the main interface. At the same time, it can realize real-time viewing of alarm monitoring videos of storage tanks and alarms, and playback of alarm video recordings; alarms include combustible gas alarms and toxic gas alarms; the alarm rules are: when the infrared thermal imager detects a leak in the storage tank, or the video monitoring detects an alarm, the video is captured and recorded, and the abnormal recording module alarms once.

[0074] Storage tank information maintenance includes: storage tank name, storage tank code, affiliated unit, storage capacity, tank bottom area, and tank height; initial inventory includes initial time and initial tank capacity; transportation process includes the name, number, person in charge, affiliated unit, pipeline name, pipeline number, and the internal treatment facility or external disposal unit to which the waste is transported.

[0075] The liquid hazardous waste generation ledger includes: generation batch code, generation time, name of liquid hazardous waste, waste category, waste code, main chemical components and content, hazardous characteristics, generation quantity, generation unit and generation unit code; When printing labels, it supports printing hazardous waste labels that meet the latest regulatory requirements, meets the requirements for thermal label printing, supports one-click printing operation, and is compatible with printing labels of 10*10cm, 15*15cm and 20*20cm sizes. In terms of communication, data is uploaded via a data switch. The equipment configuration fully considers the requirements of domestically produced chips and information technology-based systems, ensuring the system's security, stability, and independent controllability. The printer uses domestically produced chips and supports QR code printing, which not only enhances the equipment's independent controllability but also meets national information security requirements. It can seamlessly connect with the provincial solid waste management information platform, meeting environmental regulatory requirements. A user authentication and authorization mechanism is adopted, and encryption algorithms are used during data transmission and storage to ensure data security and integrity. Data backup and categorized management are supported, with different access permissions set to prevent data leakage and tampering.

[0076] In terms of hardware, the integrated device design integrates the metering module, label printer, touch screen, and data communication module into a local control cabinet, supporting deployment in harsh outdoor environments.

[0077] We use domestically produced chips and an information-based operating system to ensure data security and independent controllability.

[0078] Achieve fully automated management of hazardous waste throughout the entire process: The standardized "five-instant" process (instant generation, instant packaging, instant weighing, instant coding, and instant warehousing) has been automated, including: the weighing process is automatically triggered when liquid hazardous waste is generated, avoiding delays or errors caused by manual intervention. Label printing is completed simultaneously with hazardous waste packaging, ensuring "one item, one code" binding.

[0079] Blockchain-based data storage technology: Tamper-proof data chain: Key data on hazardous waste transfer (such as weighing value, operator, and timestamp) are encrypted using a hash algorithm and written into the blockchain to achieve data immutability and judicial-grade evidence preservation capabilities.

[0080] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0081] The above description is merely the principle and preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principle of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A liquid hazardous waste collection and transfer system, characterized in that, include: The control and management unit, along with multiple negative pressure collection units, multiple branch negative pressure delivery pipelines, multiple main negative pressure delivery pipelines, a negative pressure power unit, a monitoring unit, a transfer device, and a filtration device, all connected to the control and management unit, have fewer branch negative pressure delivery pipelines than main negative pressure delivery pipelines. Each negative pressure collection unit is connected to a branch negative pressure delivery pipeline. Multiple branch negative pressure delivery pipelines are connected to the input end of a main negative pressure delivery pipeline. The output end of the main negative pressure delivery pipeline is connected to one end of the negative pressure power unit. The other end of the negative pressure power unit is connected to the transfer device and the air filtration device respectively. The monitoring unit includes multiple monitoring sensors installed on the main negative pressure delivery pipeline and the negative pressure power unit. During operation, the negative pressure power unit provides negative pressure power to the negative pressure collection unit through the main negative pressure conveying pipeline and branch negative pressure conveying pipelines. This allows the negative pressure collection unit, located at the point of liquid hazardous waste generation, to collect the liquid hazardous waste under negative pressure. The liquid hazardous waste is then transferred to the main negative pressure conveying pipeline through the branch negative pressure conveying pipelines. The main negative pressure conveying pipeline collects the liquid hazardous waste into the negative pressure power unit, which then discharges the liquid hazardous waste to the transfer device and transports the gaseous waste gas to the gas filtration device. The control and management unit receives signals from the monitoring unit and controls the system operation according to the signals.

2. The liquid hazardous waste collection and transfer system according to claim 1, characterized in that, The negative pressure collection unit includes: a pressure sensing device, a collection chamber, a controller, a delivery pipe, a delivery valve, and a negative pressure power pipe; The lower end of the pressure sensing device is set in the collection chamber, and the upper end is connected to the input end of the controller. The output end of the controller is connected to the input end of the delivery valve and the negative pressure power pipe respectively. The output end of the negative pressure power pipe is connected to the input end of the main negative pressure delivery pipeline. The lower end of the delivery pipe is connected to the collection chamber, and the upper end is connected to the negative pressure power pipe. The delivery valve is set in the pipeline of the delivery pipe. External liquid hazardous waste enters the collection chamber through the inlet. The controller receives the pressure value detected by the pressure sensor in the collection chamber. If the pressure value is higher than the pressure threshold, the negative pressure power pipe is activated, the delivery valve is opened, and the negative pressure power pipe draws liquid from the collection chamber to the branch negative pressure delivery pipeline.

3. The liquid hazardous waste collection and transfer system according to claim 2, characterized in that, The negative pressure collection unit also includes: a ventilation valve check ball and a ventilation valve; The ventilation valve is installed on the side wall or top of the collection chamber. One end of the ventilation valve is connected to the inside of the collection chamber, and the other end is open to the outside atmosphere. The check ball of the ventilation valve is located in the ventilation channel inside the ventilation valve, allowing outside air to enter the collection chamber and preventing gas or liquid in the collection chamber from flowing out in reverse.

4. The liquid hazardous waste collection and transfer system according to claim 2, characterized in that, The pressure sensing device is a pressure sensing tube, the controller is a vacuum control unit, the delivery valve is a vacuum duckbill valve, the pressure sensing tube is connected to the input end of the vacuum control unit through a pressure sensing line, the output end of the vacuum control unit is connected to the negative pressure power tube through a power negative pressure line, and is connected to the vacuum duckbill valve through the controller output line; Liquid hazardous waste enters the collection chamber through the inlet. When the vacuum control unit detects that the pressure value in the pressure sensing tube is higher than the set pressure threshold, the vacuum control unit activates the negative pressure power tube to create negative pressure in the conveying tube. The vacuum duckbill valve opens automatically under the action of negative pressure, and the liquid hazardous waste is drawn into the negative pressure power tube through the conveying tube.

5. The liquid hazardous waste collection and transfer system according to claim 1, characterized in that, The negative pressure power unit includes: an intermediate storage tank, connecting pipes, a negative pressure tank, a drain pump, and a negative pressure pump; The intermediate storage tank and the negative pressure tank are connected by a connecting pipe. The outlet of the intermediate storage tank is connected to one end of the drain pump, and the other end of the drain pump is connected to the transfer device. The outlet of the negative pressure tank is connected to one end of the negative pressure pump, and the other end of the negative pressure pump is connected to the air filtration device. After the negative pressure pump starts, it generates negative pressure, which is transmitted to the main negative pressure delivery pipeline, branch negative pressure delivery pipeline and negative pressure collection unit through the negative pressure tank, connecting pipe and intermediate storage tank; After the liquid hazardous waste collected by the negative pressure collection unit is transferred to the intermediate storage tank, the liquid flows through the drain pump 7 to the transfer device, and the gas is transferred to the gas filtration device through the negative pressure pump.

6. The liquid hazardous waste collection and transfer system according to claim 1, characterized in that, The monitoring unit includes: a main negative pressure pipe pressure gauge and a main negative pressure pipe thermometer installed on the main negative pressure delivery pipeline; a negative pressure tank pressure gauge and a negative pressure tank thermometer installed on the negative pressure tank; an intermediate storage tank level gauge and an intermediate storage tank thermometer installed on the intermediate storage tank; a discharge flow meter installed at the output end of the discharge pump; and a negative pressure pump flow meter installed at the output end of the negative pressure pump.

7. The liquid hazardous waste collection and transfer system according to claim 1, characterized in that, The system also includes: a buffer unit at the front end of the negative pressure collection unit; a branch negative pressure pipeline valve before the branch negative pressure delivery pipeline connects to the main negative pressure delivery pipeline; and a main negative pressure pipeline valve before the main negative pressure delivery pipeline connects to the negative pressure power unit.

8. The liquid hazardous waste collection and transfer system according to claim 1, characterized in that, At preset intervals, the pipes of the branch negative pressure delivery pipeline and / or the main negative pressure delivery pipeline are bent downwards to form liquid traps.

9. A method for collecting and transferring liquid hazardous waste using the liquid hazardous waste collection and transfer system as described in any one of claims 1-8, characterized in that, include: At the point of liquid hazardous waste generation, the liquid hazardous waste is automatically collected by a negative pressure collection unit; When liquid hazardous waste is transferred, the weight of the liquid hazardous waste in the transfer device is automatically obtained through the metering module; Automatically generate and print QR code labels based on the weight and other information of the liquid hazardous waste; Link the QR code label to its corresponding hazardous liquid waste; Automatically generate electronic ledgers for liquid hazardous waste and upload them to the liquid hazardous waste management system.

10. The method for collecting and transferring liquid hazardous waste according to claim 9, characterized in that, The method also includes risk warnings; if the data collected by the monitoring unit is identified as abnormal, a warning message will be issued.

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