A dynamic membrane dynamic operation system

Abstract

The utility model discloses a kind of dynamic membrane dynamic operation systems, including raw water pool, material sorter, pre-coating agent tank, particle size separator and dynamic membrane reaction device;Dynamic membrane reaction device includes dynamic membrane reactor, the water outlet is opened in the top of dynamic membrane reactor, the water outlet is opened in the top of upper end, the water inlet is opened in the bottom;Water quality on-line monitoring instrument is arranged in raw water pool.Through the above-mentioned dynamic membrane operation system, the original dynamic membrane operating device can be dynamically adjusted according to the characteristics of water quality and water volume, and the advantages of dynamic membrane are maximized.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a dynamic membrane dynamic operation system. Background Technology

[0002] Dynamic membranes refer to membranes formed by circulating solid particles or particles generated during a reaction onto the surface of a porous support to create a new membrane, thereby improving the filtration performance of the porous support. They are also known as dynamically formed membranes. Based on their formation method, they can be divided into two categories: pre-coated dynamic membranes and self-generated dynamic membranes. Pre-coated dynamic membranes involve immersing the membrane matrix in a suspension or colloidal solution containing a pre-coating agent. The membrane matrix then forms a dynamic membrane on the matrix surface through adsorption, deposition, and concentration polarization during cross-flow filtration.

[0003] The operation of a dynamic membrane typically involves a cycle of three stages: pre-coating, filtration, and backwashing. Once these three stages are completed, a full dynamic membrane operation is finished, followed by a continuous cycle. Pre-coating refers to the deposition of film-forming particles on the substrate membrane surface under suction pressure or applied head, forming a cake layer of a certain thickness and solid-liquid separation capability. The formation of the dynamic membrane is indicated by the effluent turbidity reaching a set standard. After dynamic membrane pre-coating, the system enters the dynamic membrane filtration stage. Under applied suction pressure or applied head, the mixture in the reactor undergoes solid-liquid separation via the dynamic membrane, and the effluent turbidity meets water quality standards. As filtration progresses, impurities in the mixture gradually clog the filter channels of the dynamic membrane cake, causing an increase in filtration resistance, which in turn leads to an increase in transmembrane pressure and a decrease in membrane flux. When the filtration pressure reaches a preset value, the dynamic membrane stops filtration, followed by backwashing. The backwash water or air flows in the opposite direction to the dynamic membrane filtration direction. The resulting reverse force causes the dynamic membrane to peel off from the base membrane, thus achieving the purpose of backwashing.

[0004] In existing dynamic membrane operation, the pre-coating, filtration, and backwashing stages have fixed cycles, and the pre-coating parameters remain constant between cycles. This prevents the dynamic membrane operation device from dynamically adjusting the pre-coating parameters according to the characteristics of the influent water quality and quantity, thus failing to maximize the advantages of the "dynamic formation" of the dynamic membrane. Furthermore, as the dynamic membrane peels off from the base membrane surface, the pre-coating agent contained within it is also removed from the system, failing to achieve efficient reuse of the pre-coating agent. Utility Model Content

[0005] To address the aforementioned problems, this invention provides a dynamic membrane dynamic operation system.

[0006] The technical solution adopted in this utility model is: a dynamic membrane dynamic operation system, including a raw water tank, a material separator, a pre-coating agent tank, a particle size separator, and a dynamic membrane reaction device; the dynamic membrane reaction device includes a dynamic membrane reactor, with an outlet at the top, a product water outlet at the upper end, and an inlet at the bottom; an online water quality monitoring instrument is installed in the raw water tank; the dynamic membrane reactor includes a base membrane;

[0007] The bottom outlet of the raw water tank is connected to the bottom inlet of the dynamic membrane reactor via a raw water pipeline, and a raw water pump is installed on the raw water pipeline; the outlet of the dynamic membrane reactor is connected to the top inlet of the raw water tank and the upper feed inlet of the material separator via a return pipeline; the product water outlet is connected to the top inlet of the raw water tank via a first product water pipeline; and an outlet valve is installed after the outlet of the dynamic membrane reactor.

[0008] The top overflow port of the material separator is connected to the top inlet of the raw water tank through a first pipeline; the bottom overflow port of the material separator is connected to the top inlet of the pre-coating agent tank through a second pipeline; the top overflow port of the material separator is connected to the top inlet of the pre-coating agent tank through a third pipeline; preferably, a backwash return valve is provided on the first pipeline;

[0009] The lower outlet of the pre-coating agent tank is connected to the upper inlet of the particle size separator via a fourth pipe, and a pre-coating agent pump is installed on the fourth pipe; the bottom outlet of the particle size separator is connected to the top inlet of the pre-coating agent tank; the top overflow outlet of the particle size separator is connected to the bottom inlet of the dynamic membrane reactor via a first feed pipeline and a raw water pipeline at the rear end of the raw water pump, and a feed pump is installed on the first feed pipeline, which is connected to the raw water pipeline at the rear end of the raw water pump.

[0010] The online monitoring instruments in the raw water tank are connected to the pre-coating pump via a PLC control system.

[0011] During normal production, the dynamic membrane system operates dynamically by controlling the feed rate of the pre-coating pump based on data from online monitoring instruments. When the raw water quality is poor and the pollutant concentration is high, the pre-coating pump operates at high frequency to further reduce the overflow particle size, thereby obtaining a denser dynamic membrane and enhancing the removal of pollutants from the raw water tank. When the raw water quality is good and the pollutant concentration is low, the pre-coating pump operates at low frequency to obtain a looser dynamic membrane and enhance water production capacity. A material separator is installed to separate and recover the pre-coating agent and functional agents in the dynamic membrane damaged during the backwashing stage.

[0012] Preferably, the online water quality monitoring instrument can be one or more of the following: an online COD monitor, an online NH3-N monitor, and / or an online TP monitor.

[0013] Preferably, the pre-coating agent container contains a pre-coating agent, which includes one or more of kaolin, manganese dioxide, thermal alumina, and / or thermal iron oxide.

[0014] Preferably, the bottom outlet of the material separator is connected to the top inlet of the functional agent tank via a second pipeline; the top overflow outlet of the material separator is connected to the top inlet of the functional agent tank via a third pipeline; the bottom outlet of the functional agent tank is connected to the bottom inlet of the dynamic membrane reactor via a first feed pipeline, a second feed pipeline, and a raw water pipeline at the rear end of the raw water pump; the second feed pipeline is connected to the first feed pipeline, and a functional agent pump is installed on the second feed pipeline; a first feed valve and a third feed valve are installed on the second pipeline, and a second feed valve and a fourth feed valve are installed on the third pipeline; the online monitoring instruments in the raw water tank are connected to the functional agent pump via a PLC control system.

[0015] The addition of a functional agent tank allows for the replenishment of particles with high retention rates for characteristic pollutants in the influent, enhancing pollutant removal. During normal production, the dynamic membrane system can be dynamically operated by controlling the feed rate of the functional agent pump based on online monitoring instrument data. When the raw water quality is poor and the pollutant concentration is high, the functional agent pump operates at high frequency to enhance pollutant removal from the raw water tank. Furthermore, a material separator and four feed valves (first, second, third, and fourth) are installed to separate the mixture of pollutants, pre-coating agent, and functional agent during the backwashing stage, enabling the recovery of the pre-coating agent and functional agent.

[0016] Preferably, the first feed pipeline is equipped with a recovery control valve and a suspended solids concentration meter.

[0017] Preferably, the functional agent container contains functional agents, including one or more of activated carbon, zeolite, diatomaceous earth and / or polyvinylidene fluoride.

[0018] Preferably, the dynamic membrane reactor further includes an upper vent valve, an inlet valve, a lower vent valve, a defective product water valve, a qualified product water valve, a turbidity meter, an aeration unit, and a backwash unit. The upper vent valve is located on the outlet pipe at the rear end of the outlet, the inlet valve is located on the raw water pipe at the front end of the inlet, the lower vent valve is located on the outlet pipe at the front end of the inlet, the turbidity meter is located at the outlet at the upper end of the dynamic membrane reactor, the defective product water valve is located on the first product water pipe at the rear end of the turbidity meter, and the qualified product water valve is located on the second product water pipe at the rear end of the turbidity meter. An air inlet is located at the bottom of the dynamic membrane reactor, and the aeration unit is connected to the air inlet through an air inlet pipe. A backwash water inlet is located at the lower end of the dynamic membrane reactor, and the backwash water inlet is connected to the backwash unit through a backwash water pipe. The product water outlet at the upper end of the dynamic membrane reactor is connected to the backwash unit through a second product water pipe.

[0019] Setting a non-compliant water production valve allows the non-compliant water filtered by the dynamic membrane in the initial stage of filtration to be returned to the raw water tank.

[0020] Preferably, the aeration unit includes a blower and a gas flow meter, which are installed on the air inlet pipe.

[0021] During the pre-coating stage, turning on the fan can blow away any loose or peeling dynamic film.

[0022] Preferably, the backwash unit includes a backwash water tank, a backwash pump, and a backwash valve; the lower outlet of the backwash water tank is connected to the lower backwash water inlet of the dynamic membrane reactor, and the upper inlet of the backwash water tank is connected to the upper product water outlet of the dynamic membrane reactor; the backwash pump and the backwash valve are installed on the backwash water pipeline.

[0023] Preferably, a water supply valve is installed on the second water production pipeline.

[0024] The beneficial effects of this utility model are:

[0025] 1. The dynamic membrane operation device of this application dynamically adjusts according to the characteristics of water quality and quantity to maximize the advantages of dynamic membrane.

[0026] 2. This application adds functional agents, which can supplement particles with high retention rates for characteristic pollutants in the influent, thereby enhancing the removal of pollutants, based on the characteristics of the influent water quality.

[0027] 3. This application includes a material sorter that can separate and recover the pre-coating agent and functional agent in the dynamic membrane that is damaged during the backwashing stage, thereby achieving efficient reuse of the pre-coating agent and functional agent. Attached Figure Description

[0028] Figure 1 This is a diagram showing the material flow during the pre-coating stage of a dynamic membrane operating system.

[0029] Figure 2 This is a diagram showing the material flow during the initial stage of filtration in a dynamic membrane system.

[0030] Figure 3 This is a diagram showing the material flow during the backwashing stage of a dynamic membrane operating system.

[0031] Figure 4 This is a material flow diagram showing the separation of pre-coating agent and functional agent during the pre-coating and backwashing stages of a dynamic membrane operating system.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Raw water tank; 11-Raw water pump; 2-Material separator; 21-First feed valve; 22-Second feed valve; 23-Third feed valve; 24-Fourth feed valve; 3-Pre-coating agent tank; 31-Pre-coating agent pump; 4-Particle size separator; 41-Feed pump; 42-Suspended solids concentration meter; 51-Dynamic membrane reactor; 52-Upper vent valve; 53-Inlet valve; 54-Lower vent valve; 55-Unqualified product water valve; 56-Qualified product water valve; 57-Turbidity meter; 581-Fan; 582-Gas flow meter; 591-Backwash water tank; 592-Backwash pump; 593-Backwash valve; 594-Make-up water valve; 6-Online water quality monitoring instrument; 7-Functional agent tank; 71-Functional agent pump. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.

[0035] like Figure 1 As shown, in the pre-coating stage, the pre-coating agent pump 31, based on feedback from the online water quality monitoring instrument 6, pumps the pre-coating agent in the pre-coating agent tank 3 into the particle size separator 4 at a certain pumping frequency. After separation by the particle size separator 4, overflow with smaller particle size and underflow with larger particle size are obtained. The underflow returns to the pre-coating agent tank 3 through the underflow port; the overflow enters the first feed pipeline through the feed pump. Based on feedback from the online water quality monitoring instrument 6, the functional agent tank 7 pumps the functional agent in the functional agent tank 7 into the second feed pipeline at a certain pumping frequency. The second feed pipeline is connected to the first feed pipeline, and the pre-coating agent and functional agent are mixed at the connection point, and then enter the raw water pipeline, and enter the dynamic membrane reactor through the inlet valve 53. The pre-coating agent and functional agent form a dynamic membrane on the base membrane surface of the dynamic membrane reactor 51 by adsorption, deposition and concentration polarization during cross-flow filtration. The backwash return valve is closed, and the blower is turned on to purge the surface of the dynamic membrane. Excess pre-coating agent and functional agent enter material separator 2 through the return pipeline for separation and recovery, such as... Figure 4 As shown, the material is separated by the material separator 2, resulting in an overflow with a lower specific gravity and a bottom flow with a higher specific gravity. When the specific gravity of the pre-coating agent is greater than that of the functional agent, the bottom flow is the pre-coating agent and returns to the pre-coating agent tank 3 via the first feed valve 21. The overflow is the functional agent and returns to the functional agent tank 7 via the fourth feed valve 24. When the specific gravity of the pre-coating agent is less than that of the functional agent, the bottom flow is the functional agent and returns to the pre-coating agent tank 3 via the third feed valve 23. The overflow is the pre-coating agent and returns to the functional agent tank 7 via the second feed valve 22. This achieves the separation and recovery of the pre-coating agent and the functional agent.

[0036] like Figure 2As shown, in the initial stage of filtration, the raw water pump 11 pumps the water to be filtered from the raw water tank 1 into the dynamic membrane reactor 51, and opens the outlet valve after the outlet of the dynamic membrane reactor 51; part of the water to be filtered returns to the raw water tank 1 through the return pipeline, and part of the water to be filtered is discharged from the outlet at the upper end of the dynamic membrane reactor 51 after filtration by the dynamic membrane reactor 51. The discharged water is measured by the turbidity meter 57 at the outlet of the dynamic membrane reactor 51. Water with qualified turbidity flows out through the qualified product water valve 56. Preferably, this application also provides a backwash water tank 591. Water with qualified turbidity enters the backwash water tank 591 through the water replenishment valve 594 to achieve efficient reuse of qualified water; water with unqualified turbidity returns to the raw water tank 1 through the unqualified product water valve 55. Because the dynamic membrane rejection rate in the dynamic membrane reactor 51 is relatively low in the initial stage of filtration, the turbidity of the filtered water is unqualified. This part of the water returns to the raw water tank 1 through the unqualified product water valve 55.

[0037] like Figure 3 As shown, during the backwashing stage, backwash pump 592 reverses the flow of water from backwash tank 591 through the base membrane and the dynamic membrane formed on it, while simultaneously providing strong aeration to cause the dynamic membrane to detach from the base membrane. The detached dynamic membrane is a mixture of contaminants, pre-coating agent, and functional agent formed on the surface of the dynamic membrane during the filtration stage. This mixture enters the material separator 51 with the backwash water, where it is separated into an overflow with a lower specific gravity and a bottom flow with a higher specific gravity. Since the contaminants have a lower specific gravity, the overflow is composed of contaminants. At this point, the backwash return valve is opened, allowing the contaminants to return to the raw water tank through the first pipeline. The bottom flow is a mixture of pre-coating agent and functional agent, which enters the pre-coating agent tank through the first feed valve 21.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also within the protection scope of the present utility model.

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