Pilot-scale experiment device for wastewater treatment

Abstract

The invention provides a pilot plant test device for wastewater treatment. The device comprises a water inlet system, a coagulating sedimentation system and a tubular microfiltration system which are connected in sequence, the coagulating sedimentation system comprises a reaction assembly and a dosing assembly, the reaction assembly is respectively connected with the water inlet system and the dosing assembly, the water inlet system is used for adding wastewater into the reaction assembly, and the dosing assembly is used for adding a water treatment agent for coagulating or flocculating the wastewater into the reaction assembly; the tubular microfiltration system comprises a tubular microfiltration membrane assembly, a water producing tank and a concentrated water tank, an inlet of the tubular microfiltration membrane assembly is connected with the reaction assembly, and an outlet of the tubular microfiltration membrane assembly is respectively connected with the water producing tank and the concentrated water tank. The device can couple a coagulation and flocculation precipitation process with a tubular microfiltration process, so that the filtering effect of a microfiltration membrane is improved, the effluent quality is improved, meanwhile, the membrane pollution is slowed down, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, in particular to a pilot plant device for wastewater treatment. Background Art

[0002] With the acceleration of my country's industrialization, the environmental impact of industrial wastewater discharge is becoming increasingly prominent. Industrial wastewater commonly contains large amounts of suspended solids, heavy metals, and other hazardous substances. If discharged directly into the environment without prior treatment, it will cause serious pollution to water, soil, and air, endangering the balance of ecosystems and human health. Further efforts are needed to further improve wastewater treatment and recycling, and to promote advanced technologies such as efficient extraction and separation. Therefore, the advanced treatment and recycling of industrial wastewater is a critical environmental issue.

[0003] In the prior art, microfiltration is a commonly used filtration method that can continuously remove suspended matter and pathogens from water. However, when performing wastewater microfiltration, membrane fouling in the microfiltration device will significantly increase its running and operating costs, hindering the widespread application of this filtration method. In addition, coagulation and flocculation is a commonly used pretreatment method to reduce membrane fouling. This method can reduce membrane pore blockage, reduce filter layer resistance, and improve backwashing efficiency. Currently, in the treatment of industrial wastewater, it is often necessary to separately perform coagulation and flocculation treatment and tubular microfiltration membrane treatment on the wastewater, resulting in cumbersome steps and complicated operations. Summary of the Invention

[0004] To solve the above problems, the present invention provides a pilot experimental device for wastewater treatment, which can couple the coagulation flocculation sedimentation process with the tubular microfiltration process to enhance the filtration effect of the microfiltration membrane, improve the effluent quality, slow down the occurrence of membrane fouling, and extend the service life of the equipment.

[0005] To achieve the above-mentioned objectives, the present invention provides a pilot experimental device for wastewater treatment, comprising a water inlet system, a coagulation and sedimentation system and a tubular microfiltration system connected in sequence; the coagulation and sedimentation system comprises a reaction component and a dosing component, the reaction component is respectively connected to the water inlet system and the dosing component, the water inlet system is used to add wastewater into the reaction component, and the dosing component is used to add a water treatment agent into the reaction component to cause the wastewater to coagulate or flocculate; the tubular microfiltration system comprises a tubular microfiltration membrane assembly, a water production tank and a concentrated water tank, the inlet of the tubular microfiltration membrane assembly is connected to the reaction assembly, and the outlet of the tubular microfiltration membrane assembly is respectively connected to the water production tank and the concentrated water tank.

[0006] Optionally, the pilot plant device further includes a pump assembly, which includes a backwash pump, and the backwash pump is arranged between the outlet of the production water tank and the inlet of the tubular microfiltration membrane assembly; the backwash pump is used to transport the production water in the production water tank to the tubular microfiltration membrane assembly to clean the tubular microfiltration membrane assembly.

[0007] Optionally, the reaction assembly includes a plurality of reaction tanks and concentration tanks connected to each other, and the plurality of reaction tanks and concentration tanks are connected in an up-and-down staggered manner in the series direction; the reaction tank is connected to the water inlet system, and the outlet of the concentration tank is connected to the inlet of the tubular microfiltration membrane assembly and is used to transport liquid to the tubular microfiltration membrane assembly.

[0008] Optionally, the reaction tank includes a primary reaction tank, a secondary reaction tank and a tertiary reaction tank, the primary reaction tank is connected to the water inlet system, the primary reaction tank and the secondary reaction tank are provided with an overflow port at the upper end of the secondary reaction tank, the secondary reaction tank and the tertiary reaction tank are provided with a bottom flow port at the lower end of the tertiary reaction tank, and the tertiary reaction tank and the concentration tank are provided with the overflow port at the upper end of the concentration tank.

[0009] Optionally, the pump assembly further includes a circulation pump, one end of which is connected to the outlet of the concentration tank and the other end is connected to the inlet of the tubular microfiltration membrane assembly, and the circulation pump is used to transport the liquid in the concentration tank to the tubular microfiltration membrane assembly.

[0010] Optionally, the coagulation and sedimentation system further includes a sludge discharge assembly, which is connected to the concentration tank and is used to discharge the sediment in the concentration tank.

[0011] Optionally, the outlet of the tubular microfiltration membrane assembly is connected to the inlet of the concentration tank, and the tubular microfiltration membrane assembly is used to transport the cleaning liquid of the tubular microfiltration membrane assembly to the concentration tank and discharge it through the mud discharge assembly.

[0012] Optionally, the dosing assembly includes at least one dispensing tank, and the pump assembly further includes at least one dosing pump, with one end of each dosing pump connected to a corresponding reaction tank or concentration tank, and the other end connected to a corresponding dispensing tank. Optionally, the water inlet system includes a raw water tank, and the pump assembly further includes a water supply pump, which is disposed between the raw water tank and the reaction assembly and is used to transport wastewater in the raw water tank to the reaction assembly.

[0013] Optionally, the pilot test device also includes a connected liquid level detection device and a controller, the controller is used to be connected to the pump assembly; the liquid level detection device is arranged in the raw water tank and / or the concentrated water tank, and is used to detect the liquid level in the raw water tank and / or the concentrated water tank, and the controller is used to control the operating state of the pump assembly according to the detection result of the liquid level detection device.

[0014] The present invention provides a pilot plant device that couples a coagulation, flocculation, and sedimentation process with a tubular microfiltration process. This device not only enables the superposition of the two processes, improving pilot plant efficiency, but also enables independent and stable operation of the two processes. The device simplifies operation and offers high versatility. Adding the coagulation, flocculation, and sedimentation process before the tubular microfiltration process enhances the filtration efficiency of the microfiltration membrane, improves effluent quality, mitigates membrane fouling, and extends the life of the equipment.

[0015] In engineering applications, coagulation, flocculation, sedimentation, and tubular microfiltration processes typically require process optimization based on operating conditions such as incoming water quality, coagulant type, and coagulant residence time to achieve optimal treatment results. This pilot test device can predetermine the parameters of various operating conditions and easily adjust process parameters to meet the varying treatment requirements of incoming water. This improves the reliability of the industrial device, ensures the accuracy of experimental results, and facilitates industrial application.

[0016] In addition, the pilot test device can automatically control the water flow rate of the water inlet system and the dosage of the dosing component through the pump component, and can monitor the basic water quality information of each step in the wastewater treatment process in real time, which helps to control and adjust the wastewater treatment process in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a process flow chart of a pilot test device in a preferred embodiment of the present invention;

[0018] Figure 2 This is a schematic structural diagram of a pilot test device in a preferred embodiment of the present invention;

[0019] Figure 3 This is a schematic structural diagram of a dosing assembly in a preferred embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the structure of the reaction component in a preferred embodiment of the present invention.

[0021] In the picture:

[0022] Water inlet system 1; raw water tank 11; coagulation and sedimentation system 2; reaction component 21; reaction tank 211; primary reaction tank 2111; secondary reaction tank 2112; tertiary reaction tank 2113; concentration tank 212; dosing component 22; drug dispensing box 221; sludge discharge component 23; sludge collection box 231; tubular microfiltration system 3; tubular microfiltration membrane component 31; water production tank 32; concentrated water tank 33; pump component 4; backwash pump 41; circulation pump 42; sewage pump 43; dosing pump 44; water supply pump 45; liquid level detection device 51; stirring device 52. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are only used to facilitate and clearly illustrate the embodiments of the present invention.

[0024] The terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred mechanism or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "fixed," and the like should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] As used in this specification, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the absence of conflict, the following embodiments and features therein may complement or be combined with each other.

[0028] Reference Figure 1 and Figure 2 As shown, a preferred embodiment of the present invention provides a pilot test device for wastewater treatment, comprising a water inlet system 1, a coagulation and sedimentation system 2, and a tubular microfiltration system 3 connected in sequence. The coagulation and sedimentation system 2 comprises a reaction component 21 and a dosing component 22. The reaction component 21 is connected to the water inlet system 1 and the dosing component 22, respectively. The water inlet system 1 is used to add wastewater (i.e., industrial wastewater to be treated) into the reaction component 21, and the dosing component 22 is used to add a water treatment agent to the reaction component 21 to cause coagulation or flocculation of the wastewater. The tubular microfiltration system 3 comprises a tubular microfiltration membrane assembly 31, a water production tank 32, and a concentrated water tank 33. The inlet of the tubular microfiltration membrane assembly 31 is connected to the reaction component 21, and the outlet of the tubular microfiltration membrane assembly 31 is connected to the water production tank 32 and the concentrated water tank 33, respectively.

[0029] More specifically, the inlet of the tubular microfiltration membrane assembly 31 is connected to the outlet of the concentrator tank 212 via a pipeline. The tubular microfiltration membrane assembly 31 has a concentrate side and a product side, with the product side connected to a product tank 32. The product tank 32 collects the product water produced after filtration by the tubular microfiltration membrane assembly 31, while the concentrate tank 33 collects the concentrate produced after filtration by the tubular microfiltration membrane assembly 31.

[0030] The present invention provides a pilot plant for wastewater treatment that couples a coagulation, flocculation, and sedimentation process with a tubular microfiltration process. This not only allows for the combined operation of the two processes, improving pilot plant efficiency, but also enables independent and stable operation of the two processes. The process is simple to operate and highly versatile. Adding the coagulation, flocculation, and sedimentation process prior to the tubular microfiltration process enhances the filtration efficiency of the microfiltration membrane, improves effluent quality, mitigates membrane fouling, and extends the life of the equipment.

[0031] In engineering applications, coagulation, flocculation, sedimentation, and tubular microfiltration typically require process optimization based on operating conditions such as incoming water quality, coagulant type, and coagulant residence time to achieve optimal treatment results. This pilot test device can predetermine parameters for various operating conditions and easily adjust process parameters to meet varying incoming water treatment requirements. This improves the reliability of industrial equipment, ensures the accuracy of experimental results, and facilitates industrial application.

[0032] It should be noted that a pilot plant refers to a device that conducts semi-industrial scale testing and verification of wastewater treatment technologies, processes or equipment based on small-scale laboratory experiments.

[0033] It should also be noted that the tubular microfiltration membrane assembly 31 can use the micropores of the tubular microfiltration membrane to filter the incoming water. The tubular microfiltration membrane assembly 31 can allow the incoming water to pass through the membrane pores under the drive of the pressure difference. In this process, pollutants such as suspended matter, colloids and bacteria are intercepted on the membrane surface and cannot pass through. Therefore, the incoming water can be microfiltered to achieve solid-liquid separation of the incoming water.

[0034] Preferably, the water inlet system 1, the coagulation and sedimentation system 2 and the tubular microfiltration system 3 can all be arranged in a movable metal frame to facilitate the movement of the pilot test device and meet the pilot test requirements of various types of wastewater.

[0035] Furthermore, the pilot plant for wastewater treatment also includes a pump assembly 4, which includes a backwash pump 41. Backwash pump 41 is positioned between the outlet of the production water tank 32 and the inlet (e.g., the production water inlet) of the tubular microfiltration membrane assembly 31. Backwash pump 41 is used to transport the production water in the production water tank 32 to the tubular microfiltration membrane assembly 31 to clean the tubular microfiltration membrane assembly 31.

[0036] Specifically, when flushing the tubular microfiltration membrane assembly 31 , the backwash pump 41 may be turned on to allow the produced water in the produced water tank 32 to enter the tubular microfiltration membrane assembly 31 , thereby flushing the tubular microfiltration membrane assembly 31 .

[0037] The present invention arranges the conveying process and backwashing process of the tubular microfiltration membrane assembly 31 in the tubular microfiltration system 3 and shares a set of pipelines, thereby simplifying the structure of the pilot test device and reducing the difficulty of operation and maintenance of the pilot test device.

[0038] In a preferred embodiment, an opening (not numbered) is preferably provided on the top of the water production tank 32. In actual operation, a water intake device (not shown) can be inserted into the water production tank 32 through the opening as needed to extract the produced water formed after the wastewater is treated by tubular microfiltration.

[0039] The present application does not impose any restrictions on the membrane pore size and membrane area of the tubular microfiltration membrane assembly 31. In one example, the membrane pore size of the tubular microfiltration membrane assembly 31 is 0.1 μm and the membrane area is 0.3 μm. 2 .

[0040] Continue to refer to Figure 1 The reaction assembly 21 includes a plurality of interconnected reaction tanks 211 and concentrating tanks 212. These multiple reaction tanks 211 and concentrating tanks 212 are sequentially connected in a staggered manner in the series direction, so that wastewater entering the reaction tanks 211 flows in a staggered manner in the series direction. The reaction tanks 211 are connected to the water inlet system 1, and the outlets of the concentrating tanks 212 are connected to the inlets of the tubular microfiltration membrane modules 31, thereby transporting liquid to the tubular microfiltration membrane modules 31.

[0041] Reference Figure 1 and Figure 4 As shown, as a preferred embodiment, the reaction tank 211 includes a primary reaction tank 2111, a secondary reaction tank 2112, and a tertiary reaction tank 2113, which are sequentially connected. In one example, the primary reaction tank 2111 and the secondary reaction tank 2112 are each connected to a dosing assembly 22, which is used to deliver water treatment agents into the primary reaction tank 2111 and the secondary reaction tank 2112, respectively. In another embodiment, the concentration tank 212 and / or the tertiary reaction tank 2113 may also be connected to the dosing assembly 22.

[0042] Reference Figure 1 and Figure 4 As shown, in one example, the primary reaction tank 211 is connected to the water inlet system 1, and a first overflow port (unnumbered) is provided at the upper end of the partition (unnumbered) between the primary reaction tank 211 and the secondary reaction tank 211, through which the primary reaction tank 2111 and the secondary reaction tank 2112 can communicate. An underflow port (unnumbered) is provided at the lower end of the partition between the secondary reaction tank 2112 and the tertiary reaction tank 2113, through which the secondary reaction tank 2112 and the tertiary reaction tank 2113 can communicate. The underflow port is provided at the bottom opposite to the first overflow port. A second overflow port is provided at the upper end of the partition between the tertiary reaction tank 2113 and the concentration tank 212, through which the tertiary reaction tank 2113 and the concentration tank 212 can communicate. The second overflow port 213 is provided at the top opposite to the underflow port 214.

[0043] Reference Figure 1 As shown, the pump assembly 4 preferably also includes a circulation pump 42, one end of the circulation pump 42 is connected to the outlet of the concentrated water tank 212, and the other end is connected to the inlet of the tubular microfiltration membrane assembly 31. The circulation pump 42 is used to transport the liquid in the concentrated water tank 212 to the tubular microfiltration membrane assembly 31 for filtration.

[0044] Continue to refer to Figure 1 The coagulation and sedimentation system 2 further includes a mud discharge component 23 , which is connected to the concentration tank 212 and is used to discharge the sediment in the concentration tank 212 .

[0045] As a specific example, the sludge discharge assembly 23 includes a sludge collection tank 231, and the pump assembly 4 also includes a sewage pump 43. The sludge collection tank 231 is connected to the sewage pump 43. The sewage pump 43 is used to extract sediment from the concentration tank 212 and input the sediment into the sludge collection tank 231. The bottom of the sludge collection tank 231 is provided with a sludge discharge outlet (unnumbered), and the sludge collection tank 231 is connected to an external sludge treatment system through the sludge discharge outlet.

[0046] like Figure 1As shown, the outlet of the tubular microfiltration membrane assembly 31 (specifically the concentrated water outlet) is connected to the inlet of the concentration tank 212 (specifically the backwash sewage reflux port), and the tubular microfiltration membrane assembly 31 is used to transport the cleaning liquid of the tubular microfiltration membrane assembly 31 to the concentration tank 212 and discharge it through the mud discharge assembly 23.

[0047] Optionally, each reaction tank 211 may be connected to a sludge collection box 231 or an external collection device to discharge the liquid in the reaction tank 211 .

[0048] Furthermore, the raw water tank 11 , the sludge collection tank 231 , the produced water tank 32 and the concentrated water tank 33 are preferably connected to drainage pipelines, which are used to discharge the solution or sludge in each tank.

[0049] In addition, a water intake may be provided on the concentration tank 212 , and the water intake is used to connect to a water intake device so as to extract produced water formed after the wastewater undergoes coagulation and flocculation treatment through the water intake device.

[0050] Furthermore, the dosing assembly 22 includes at least one dispensing box 221, and the pump assembly 4 also includes at least one dosing pump 44. Each dosing pump 44 is disposed between a corresponding reaction tank 211 and a corresponding dispensing box 221. The dispensing box 1 is configured to contain and mix water treatment agents, and the dosing pump 2 is configured to transport the water treatment agents in the dispensing box 1 to the reaction assembly 21. The advantage of this design is that different agents can be added to the dispensing box 221, thereby allowing different agents to be added to the reaction tank 211 according to different incoming water, thereby improving the versatility of the device.

[0051] During actual operation, one or more water treatment agents can be added into the drug dispensing box 221. When there are multiple water treatment agents, the drug dispensing box 221 can mix the water treatment agents.

[0052] In other embodiments, the dosing pump 44 may also be directly connected to an external drug supply device. In this case, the water treatment agent may be directly provided to the reaction tank 211 through the external drug supply device and the dosing pump 44 .

[0053] In a preferred embodiment, there are multiple drug dispensing boxes 221 and multiple dosing pumps 44, and each drug dispensing box 221 is connected to a corresponding dosing pump 44. Among all the dosing pumps 44, some are connected to the drug inlet at the top of the primary reaction tank 2111 and are used to transport water treatment agents into the primary reaction tank 2111; another part of the dosing pumps 44 is connected to the drug inlet at the top of the secondary reaction tank 2112 and is used to transport water treatment agents into the secondary reaction tank 2112.

[0054] The present invention is provided with multiple reaction tanks 211 so that the pilot test device has multiple dosing points. The type of medicine in the medicine dispensing box 221 can be adjusted according to the type of wastewater. The flow rate of the medicine is also adjusted by the dosing pump 44 to achieve precise control of the dosing position and dosing amount in the reaction component 21. The basic water quality information of each step in the wastewater treatment process can be monitored in real time, which is helpful to control and adjust the wastewater treatment process in real time, improve the treatment effect of the pilot test device, and improve the practicality and versatility of the pilot test device.

[0055] In one specific example, the dosing pump 44 is connected to the reaction tank 211 via a hose. In actual use, the connection between the reaction tank 211 and the dispensing box 221 can be adjusted by changing the position of the hose. For example, the dosing pump 44 originally connected to the primary reaction tank 2111 can be adjusted to connect to the secondary reaction tank 2112. This adjusts the dosing position of the dispensing box 221 on the reaction assembly 21, thereby meeting the different coagulation and flocculation requirements of wastewater with different proportions, thereby improving the versatility and practicality of the pilot test device.

[0056] It should be noted that the types of water treatment agents in the drug dispensing box 221 connected to the primary reaction tank 2111 and the drug dispensing box 221 connected to the secondary reaction tank 2112 are different. In this way, different types of water treatment agents can be added in different treatment steps of the wastewater to realize the coagulation, flocculation and sedimentation process of the wastewater.

[0057] Furthermore, the water inlet system 1 includes a raw water tank 11, and the pump assembly 4 further includes a water supply pump 45. The water supply pump 45 is disposed between the raw water tank 11 and the reaction assembly 21 and is used to transport wastewater in the raw water tank 11 to the reaction assembly 21. In other embodiments, the water supply pump 45 can also be directly connected to an external water supply device. In this case, wastewater can be provided to the reaction assembly 21 through the external water supply device and the water supply pump 45.

[0058] In a preferred example, the dosing pump 44 and the water supply pump 45 can both be centrifugal pumps. In another preferred example, the dosing pump 44 and the water supply pump 45 can also be other types of pump devices.

[0059] When tubular microfiltration is not required for wastewater treatment, the circulation pump 42 can be shut down, thereby disconnecting the tubular microfiltration system 3. Concentration tank 212 can then serve as the water production end for the coagulation, flocculation, and sedimentation steps. When coagulation, flocculation, and sedimentation are not required for wastewater treatment, the water supply pump 45 and dosing pump 44 can be shut down, thereby disconnecting the water inlet system 1 and dosing assembly 22. Concentration tank 212 can then serve as the raw water end for the tubular microfiltration step.

[0060] Furthermore, the pilot test apparatus also includes a connected liquid level detection device 51 and a controller, which is connected to the pump assembly 4. The liquid level detection device 51 is disposed in the raw water tank 11 and / or the concentrate tank 33 and is used to detect the liquid level in the raw water tank 11 and / or the concentrate tank 33. The controller is used to control the operating state of the pump assembly 4 based on the detection results of the liquid level detection device 51.

[0061] Specifically, the liquid level detection device 51 may trigger a liquid level alarm when the liquid level in the raw water tank 11 and / or the concentrated water tank 33 is lower than a preset liquid level, and shut down a corresponding pump assembly 4 .

[0062] At the same time, the pilot test device can control and adjust the water supply pump 45 and the dosing pump 44 through the controller, thereby regulating the water flow of the water inlet system 1 and the dosing amount of the dosing component 33.

[0063] The pilot plant also includes a valve assembly, at least some of which is opened during the coagulation, flocculation, sedimentation, or tubular microfiltration process to complete the wastewater treatment steps within the pilot plant. The agitator 51 and the valve assembly are preferably both controlled by a controller, which can control the opening and closing of the agitator 51 and the valves according to desired conditions.

[0064] In a non-limiting embodiment, the wastewater treatment step is preferably as follows: after adding the water treatment agent to the dispensing box 221, the dosing pump 44 and the water supply pump 45 are turned on, and the wastewater is transported to the reaction component 21 under the drive of the water supply pump 45, and the water treatment agent is transported to the reaction component 21 under the drive of the dosing pump 44. The stirring device 51 is turned on to mix the wastewater and the water treatment agent. The water treatment agent can interact with the wastewater in the reaction component 21 to remove particles and suspended matter in the wastewater. The wastewater after coagulation and flocculation is transported to the tubular microfiltration membrane assembly 31 for microfiltration under the drive of the circulation pump 42. Subsequently, the produced water after filtration by the tubular microfiltration membrane assembly 31 is collected in the produced water tank 32, and the concentrated water before filtration by the tubular microfiltration membrane assembly 31 is collected in the concentrated water tank 33.

[0065] When the tubular microfiltration membrane assembly 31 needs to be flushed, the backwash pump 41 can be turned on and the circulation pump 22 can be turned off. At this time, the backwash pump 41 can transport the produced water in the water tank 42 to the tubular microfiltration membrane assembly 41, thereby cleaning the tubular microfiltration membrane assembly 31. The cleaning liquid of the tubular microfiltration membrane assembly (i.e., the cleaned sewage) can be transported to the concentration tank 212 through the pipeline and discharged through the mud discharge assembly 23 at the bottom of the concentration tank 212.

[0066] Further preferably, a plurality of control nodes are provided on the connecting pipelines in the pilot test device, and the control nodes may include one or more of a pressure control node, a flow control node and a pH detection node.

[0067] Reference Figure 1 As shown, a flow control node (e.g., a flow transmitter FT) may be installed in the pipeline between the raw water tank 11 and the reaction tank 211 to detect the flow rate of the solution entering the reaction tank 211. A liquid level detection device 51 (e.g., a liquid level switch LS) may be installed in the raw water tank 11, the concentrate tank 212, and / or the product water tank 32 to obtain the liquid level values in the raw water tank 11, the concentrate tank 212, and / or the product water tank 32. A stirring device 52 is installed in at least one of the reaction tanks 211 to mix the water treatment agent and wastewater in the reaction tank 211.

[0068] Preferably, a pressure control node (e.g., a pressure indicating transmitter PIT), a flow control node (e.g., a flow display device FI), and a pH detection node (e.g., a pH monitor) are provided on the pipeline between the outlet of the concentrate tank 212 and the inlet of the tubular microfiltration membrane assembly 31 to detect the pressure, pH, and flow values on the pipeline. A pressure control node (e.g., a pressure indicating transmitter PIT) is provided on the pipeline between the inlet of the concentrate tank 212 and the outlet of the tubular filtration membrane assembly 31 to detect the pressure of the liquid flowing into and out of the tubular microfiltration membrane assembly 31.

[0069] Further preferably, a flow control node (e.g., flow transmitter FT) is provided on the pipeline between the outlet of the tubular microfiltration membrane assembly 31 and the inlet of the production water tank 32 to detect the flow rate of the solution entering the production water tank 32. A turbidity monitoring device (NTU) is also provided at the outlet of the tubular microfiltration membrane assembly 31 to facilitate measurement and analysis of the turbidity of the solution at the outlet. A flow control node (e.g., flow display device FI) can be provided on the pipeline between the inlet and outlet of the tubular microfiltration membrane assembly 31 to display the flow rate of the solution in the pipeline during backwashing of the tubular microfiltration membrane assembly 31.

[0070] The liquid level switch LS, the flow transmitter FT, the pressure indicating transmitter PIT, the flow display device FI and the pH monitor are respectively connected to the controller and used to transmit the pressure signal, the liquid level signal, the flow signal and the pH signal to the controller.

[0071] Preferably, the valve assembly is configured as an electric valve and is controlled by a controller. In this configuration, the controller can also control the opening and closing of each valve according to the pressure signal, the pH signal, and the flow signal.

[0072] The pressure detection nodes, flow detection nodes, and pH detection nodes in this application can all be controlled by conventional instruments, which will not be described in detail here.

[0073] The present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0074] <Example 1>

[0075] In this embodiment, a pilot plant is used to perform coagulation, flocculation and sedimentation treatment and tubular microfiltration treatment on wastewater to remove magnesium ions and calcium ions from industrial wastewater.

[0076] In this embodiment, the dosing assembly 22 includes two dosing boxes 221 and a dosing pump 44. The primary dosing pump is connected to the primary dosing box and the primary reaction tank 2111, respectively, and is used to add a water treatment agent, such as a 5% sodium hydroxide solution, to the primary reaction tank 2111. The secondary dosing pump is connected to the secondary dosing box and the secondary reaction tank 2112, respectively, and is used to add another water treatment agent, such as a 10% sodium carbonate solution, to the secondary reaction tank 2112.

[0077] In a non-limiting embodiment, the process of sequentially subjecting wastewater to a coagulation, flocculation, sedimentation process and a tubular microfiltration process includes:

[0078] Before the wastewater entered the pilot test device, the calcium ion concentration in the wastewater was measured to be 441 mg / L and the magnesium ion concentration was 121 mg / L.

[0079] According to the composition ratio of the wastewater, a sodium hydroxide solution with a composition of 5% is selected as the water treatment agent in the primary reaction tank 2111, and a sodium carbonate solution with a composition of 10% is selected as the water treatment agent in the secondary reaction tank 2112.

[0080] First, turn on the water pump 45 and the primary dosing pump. Wastewater is added to the primary reaction tank 2111 via the water pump 45. The primary dosing pump also adds 5% sodium hydroxide solution as a pH adjuster. The amount of 5% sodium hydroxide solution added can be adjusted by controlling the frequency of the primary dosing pump. Turn on the stirring device 52 in the primary reaction tank 2111 to thoroughly mix the wastewater and sodium hydroxide solution. The mixed solution flows through the first overflow port at the top of the primary reaction tank 2111 into the secondary reaction tank 2112.

[0081] Next, the secondary dosing pump is turned on and 10% sodium carbonate solution is added to the secondary reaction tank 2112 as a coagulant. The amount of 10% sodium carbonate solution added can be adjusted by controlling the frequency of the secondary dosing pump. The stirring device 52 in the secondary reaction tank 2112 is turned on to thoroughly mix the wastewater and sodium carbonate solution. The mixed solution flows through the underflow port at the bottom of the secondary reaction tank 2112 into the tertiary reaction tank 2113.

[0082] Subsequently, the stirring device 52 in the tertiary reaction tank 2113 is turned on to allow the mixed solution to undergo a thorough mixing reaction. The mixed solution flows through the second overflow port at the top of the tertiary reaction tank 2113 and enters the concentration tank 212. The sludge in the concentration tank 212 is transported by the sewage pump 43 to the sludge collection tank 231 for centralized treatment.

[0083] Then, circulation pump 42 is turned on to transport the produced water generated by the coagulation and flocculation process in concentrating tank 212 to tubular microfiltration membrane assembly 31 for microfiltration. The pore size of the filter membrane in tubular microfiltration membrane assembly 31 is 0.1 μm, and the transmembrane pressure difference is controlled at 0.3 MPa. The produced water after microfiltration by tubular microfiltration membrane assembly 31 enters produced water tank 32, and the concentrated water after microfiltration by tubular microfiltration membrane assembly 31 enters concentrated water tank 33. After the wastewater is treated through the coagulation and flocculation process and the tubular microfiltration process, the calcium ion removal efficiency of the produced water in produced water tank 32 is 91.5%, and the magnesium ion removal efficiency of the produced water in produced water tank 32 is 88.0%.

[0084] After the pilot test, the tubular microfiltration membrane assembly 31 needs to be cleaned. In actual operation, the circulation valve 42 is closed, the backwash valve 41 is opened, and the produced water tank 32 is used as a backwash tank. The produced water in the produced water tank 32 is transported to the tubular microfiltration membrane assembly 31 through the backwash valve 41 to clean the tubular microfiltration membrane assembly 31. The cleaned wastewater can be collected through a pipeline into the concentration tank 212 and discharged to the outside through the sewage discharge assembly 23 at the bottom of the concentration tank 212.

[0085] <Example 2>

[0086] In this embodiment, a pilot test device can be used to perform coagulation, flocculation and sedimentation treatment on wastewater to remove metallic thallium from industrial wastewater.

[0087] In this embodiment, the position of the hose connected to the dosing pump is changed, and the first-level dosing pump or the second-level dosing pump is connected to the concentration tank 212. A coagulant (for example, 0.05% PAM solution, i.e., polyacrylamide solution) is added to the concentration tank 212 through the dosing pipeline. The coagulant helps to increase the sedimentation efficiency so that more sediment in the wastewater is deposited at the bottom of the concentration tank 212.

[0088] More specifically, the dosing assembly 22 includes three dosing tanks 221 and three dosing pumps 44. The primary dosing pump is connected to the primary dosing tank 221 and the primary reaction tank 2111, respectively, and is used to add a water treatment agent, such as a 10% lime milk solution, to the primary reaction tank 2111. The secondary dosing pump is connected to the secondary dosing tank 221 and the secondary reaction tank 2112, respectively, and is used to add another water treatment agent, such as a 10% sodium sulfide solution, to the secondary reaction tank 2112. The tertiary dosing pump is connected to the tertiary dosing tank 221 and the concentration tank 212, respectively, and is used to add yet another water treatment agent, such as a 0.05% PAM solution, to the concentration tank 212.

[0089] In a non-limiting embodiment, the process of coagulation, flocculation and sedimentation of wastewater includes:

[0090] Before the wastewater entered the pilot test device, the metallic thallium content in the wastewater was measured to be 3221ug / L.

[0091] According to the composition ratio of the wastewater, lime milk with a composition of 10% is selected as the water treatment agent in the primary reaction tank 2111, sodium sulfide solution with a composition of 10% is selected as the water treatment agent in the secondary reaction tank 2112, and PAM solution with a composition of 0.05% is selected as the water treatment agent in the concentrated water tank 212.

[0092] First, the circulation pump 42 and the manual valve between the concentration tank 212 and the circulation pump 42 are closed, and then the tubular microfiltration system 3 is closed. At this time, a pilot experiment is carried out on the single coagulation, flocculation and sedimentation process of the wastewater. The water sample collected in the concentration tank 212 is the produced water generated by the coagulation, flocculation and sedimentation process of the wastewater.

[0093] The industrial wastewater to be filtered for thallium metal is transferred to the raw water tank 11. The circulation pump 42 is turned off, and the water supply pump 45 and the primary dosing pump are turned on. The frequency of the water supply pump 45 is adjusted to control the water flow rate into the primary reaction tank 2111. The industrial wastewater is fed into the primary reaction tank 2111 via the water supply pump 45. A 10% lime milk solution is added to the primary reaction tank 2111 as a pH adjuster via the primary dosing pump to control the pH value in the primary reaction tank 2111 to approximately 11. The stirring device 52 in the primary reaction tank 2111 is turned on to thoroughly mix the industrial wastewater and the lime milk solution. Once the mixed solution reaches the first overflow port, it begins to overflow into the secondary reaction tank 2112.

[0094] Next, the stirring device 52 and the secondary dosing pump in the secondary reaction tank 2112 are turned on. A 10% sodium sulfide solution is added to the secondary reaction tank 2112 as a coagulant via the secondary dosing pump. The stirring device 52 thoroughly mixes the wastewater with the sodium carbonate solution. The sodium sulfide and thallium ions form a thallium sulfide precipitate, thereby removing thallium ions from the industrial wastewater. The amount of 10% sodium sulfide solution added can be adjusted by controlling the frequency of the secondary dosing pump. The mixed solution enters the tertiary reaction tank 2113 through the underflow port at the bottom of the secondary reaction tank 2112.

[0095] Then, the stirring device 52 in the tertiary reaction tank 2113 is turned on to allow the mixed solution to undergo a thorough mixing reaction. After the mixed solution reaches the overflow level, it flows into the concentration tank 212 through the second overflow port at the top of the tertiary reaction tank 2113.

[0096] Then, the tertiary dosing pump is turned on to add 0.05% PAM solution as a coagulant into the concentrated water tank 212 through the tertiary dosing pump. The PAM solution can play a coagulant role to form more sediment in the industrial wastewater.

[0097] Afterwards, the manual valves at the bottom of each stage of the reaction tank 211 , which are arranged between the reaction tank 211 and the sewage pump 43 , are opened to collect the sludge in the reaction tank 211 into the sludge collection box 231 .

[0098] After the pilot plant was operated continuously for 2 hours, the supernatant in the concentration tank 212 (i.e., the produced water in the coagulation, flocculation and sedimentation process) was taken. Through testing, it was found that the thallium content in the produced water in the supernatant was 4ug / L. Based on this, it can be known that the pilot plant can remove 99.87% of thallium ions in industrial wastewater.

[0099] <Example 3>

[0100] In this embodiment, industrial wastewater is directly added to the concentration tank 212, so that the concentration tank 212 serves as the raw water end. In this embodiment, a single tubular microfiltration process pilot test is conducted on industrial wastewater using a pilot test device to remove suspended solids after mixing and settling in the industrial wastewater.

[0101] In one non-limiting embodiment, the process of subjecting wastewater to tubular microfiltration includes:

[0102] Before the wastewater entered the pilot test device, the turbidity of the wastewater was measured to be 723.9 NTU.

[0103] First, the coagulation, flocculation and sedimentation system 2 is closed to conduct a pilot test on a single tubular microfiltration process of wastewater. At this time, the water sample collected in the production water tank 32 is the production water of the tubular microfiltration process of industrial wastewater.

[0104] Industrial wastewater is fed into the concentrate tank 212. The water supply pump 45 and the dosing pump 44 are turned off, and industrial wastewater is added to the concentrate tank 212. The circulation pump 42 and the backwash pump 41 are turned on. The circulation pump 42 transports the industrial wastewater to the tubular microfiltration membrane assembly 31 for microfiltration treatment. The treated product water is then collected in the product water tank 32. The treated product water is then piped back into the concentrate tank 212, completing the circulation cycle between the tubular microfiltration membrane assembly 31 and the concentrate tank 212. During this process, industrial wastewater can be added as needed based on the water level in the concentrate tank 212.

[0105] After the pilot test, the tubular microfiltration membrane assembly 31 needs to be cleaned. In actual operation, the circulation valve 42 is closed, the backwash valve 41 is opened, and the produced water tank 32 is used as a backwash tank. The produced water in the produced water tank 32 is transported to the tubular microfiltration membrane assembly 31 through the backwash valve 41 to clean the tubular microfiltration membrane assembly 31. The cleaned wastewater (i.e., the cleaning liquid) can flow through the pipeline into the concentration tank 212 and be discharged outward through the sewage discharge assembly 23 at the bottom of the concentration tank 212.

[0106] After the pilot test device was continuously operated for 30 minutes, the produced water in the produced water tank 32 was extracted. Through testing, it was found that the turbidity of the produced water was 7.28 NTU. Based on this, it can be known that the pilot test device can remove 98.99% of the suspended solids in industrial wastewater.

[0107] In summary, the present invention provides a pilot plant for wastewater treatment that couples a coagulation, flocculation, and sedimentation process with a tubular microfiltration process. This not only allows for the superposition of the two processes, improving pilot plant efficiency, but also enables independent and stable operation of the two processes. The process is simple to operate and highly versatile. Adding the coagulation, flocculation, and sedimentation process prior to the tubular microfiltration process enhances the filtration efficiency of the microfiltration membrane, improves effluent quality, and mitigates membrane fouling, extending the life of the equipment.

[0108] In engineering applications, coagulation, flocculation, sedimentation, and tubular microfiltration processes typically require process optimization based on operating conditions such as incoming water quality, coagulant type, and coagulant residence time to achieve optimal treatment results. This pilot test device can predetermine parameters for various operating conditions and easily adjust process parameters to meet varying incoming water treatment requirements. This improves the reliability of industrial equipment and the accuracy of experimental results, facilitating industrial application.

[0109] In addition, the pilot test device can automatically control the water flow of the water inlet system 1 and the dosage of the dosing component 22 through the pump component 4, and can monitor the basic water quality information of each step in the wastewater treatment process in real time, which helps to control and adjust the wastewater treatment process in real time.

[0110] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure are within the scope of protection of the present invention.

Claims

1. A pilot plant for wastewater treatment, characterized in that: It includes a water inlet system, a coagulation and sedimentation system and a tubular microfiltration system connected in sequence; the coagulation and sedimentation system includes a reaction component and a dosing component, the reaction component is respectively connected to the water inlet system and the dosing component, the water inlet system is used to add wastewater into the reaction component, and the dosing component is used to add a water treatment agent into the reaction component to cause the wastewater to coagulate or flocculate; the tubular microfiltration system includes a tubular microfiltration membrane component, a water production tank and a concentrated water tank, the inlet of the tubular microfiltration membrane component is connected to the reaction component, and the outlet of the tubular microfiltration membrane component is respectively connected to the water production tank and the concentrated water tank.

2. The pilot plant for wastewater treatment according to claim 1, characterized in that: It also includes a pump assembly, which includes a backwash pump. The backwash pump is arranged between the outlet of the water production tank and the inlet of the tubular microfiltration membrane assembly; the backwash pump is used to transport the produced water in the water production tank to the tubular microfiltration membrane assembly to clean the tubular microfiltration membrane assembly.

3. The pilot plant for wastewater treatment according to claim 2, characterized in that: The reaction assembly includes a plurality of reaction tanks and concentration tanks connected to each other, and the plurality of reaction tanks and the concentration tanks are connected in an up-and-down staggered manner in the series direction; the reaction tank is connected to the water inlet system, and the outlet of the concentration tank is connected to the inlet of the tubular microfiltration membrane assembly and is used to transport liquid to the tubular microfiltration membrane assembly.

4. The pilot plant for wastewater treatment according to claim 3, wherein: The reaction tank comprises a primary reaction tank, a secondary reaction tank and a tertiary reaction tank which are connected in sequence, and the primary reaction tank and the secondary reaction tank are respectively connected to the dosing assembly.

5. The pilot plant for wastewater treatment according to claim 3, characterized in that: The pump assembly also includes a circulation pump, one end of which is connected to the outlet of the concentration tank and the other end is connected to the inlet of the tubular microfiltration membrane assembly. The circulation pump is used to transport the liquid in the concentration tank to the tubular microfiltration membrane assembly.

6. The pilot plant for wastewater treatment according to claim 3, characterized in that: The coagulation and sedimentation system further includes a mud discharge assembly, which is connected to the concentration tank and is used to discharge the sediment in the concentration tank.

7. The pilot plant for wastewater treatment according to claim 6, characterized in that: The outlet of the tubular microfiltration membrane assembly is connected to the inlet of the concentration tank. The tubular microfiltration membrane assembly is used to transport the cleaning liquid of the tubular microfiltration membrane assembly to the concentration tank and discharge it through the mud discharge assembly.

8. The pilot plant for wastewater treatment according to claim 3, wherein: The dosing component includes at least one drug dispensing box, and the pump component also includes at least one dosing pump. One end of each dosing pump is connected to a corresponding reaction tank or the concentration tank, and the other end is connected to a corresponding drug dispensing box.

9. The pilot plant for wastewater treatment according to any one of claims 2 to 8, characterized in that: The water inlet system includes a raw water tank, and the pump assembly further includes a water supply pump. The water supply pump is arranged between the raw water tank and the reaction assembly and is used to transport the wastewater in the raw water tank to the reaction assembly.

10. The pilot plant for wastewater treatment according to claim 9, characterized in that: It also includes a connected liquid level detection device and a controller, the controller is used to be connected to the pump assembly; the liquid level detection device is arranged in the raw water tank and / or the concentrated water tank, and is used to detect the liquid level in the raw water tank and / or the concentrated water tank, and the controller is used to control the operating state of the pump assembly according to the detection result of the liquid level detection device.

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