Desalination experiment device based on FCDI

Abstract

The utility model belongs to the technical field of desalination experiment equipment, particularly relates to a desalination experiment device based on FCDI, and provides the following scheme aiming at the problem of lack of further research on optimization and the like of technological parameters of an FCDI device in the prior art: the desalination experiment device comprises a supporting table, and an inverted U-shaped frame is arranged at the top end of the supporting table; a first peristaltic pump, a second peristaltic pump and a third peristaltic pump are sequentially arranged on the inverted U-shaped frame, three accommodating bottles are arranged at the next part of the inverted U-shaped frame, and the three accommodating bottles are respectively used for accommodating an anode flowing electrode solution, a cathode flowing electrode solution and saline water; according to the RO-FCDI process, compared with a secondary reverse osmosis process, the RO-FCDI process needs less membrane cleaning and maintenance, the service life of the membrane can be prolonged by about 20%, the cost can be reduced in long-term operation, the service life of one reverse osmosis membrane is about 2-5 years, the cost is about 1000 yuan, and 200 yuan of membrane maintenance cost can be saved every year by using the RO-FCDI process.

Description

Technical Field

[0001] The utility model relates to the technical field of desalination experimental equipment, in particular to a desalination experimental device based on FCDI. Background Art

[0002] In the fields of environmental engineering and water treatment technology, freshwater shortages and water pollution are becoming increasingly serious, especially in arid and semi-arid regions. Freshwater scarcity has become a key constraint on socioeconomic development. Approximately 98% of the world's water resources are brackish water, seawater, and other saltwater sources with high salinity that are not directly drinkable. Therefore, developing a low-energy, efficient, and environmentally friendly desalination technology is crucial for addressing the global water crisis.

[0003] In order to solve the problems existing in traditional CDI technology, a small number of scholars abroad have prepared carbon suspensions (carbon slurries) as mobile electrodes and applied them to CDI processes, also known as mobile electrode capacitive deionization (FCDI) processes. The FCDI process uses carbon materials suspended in the pores engraved on the surface of the collector as electrodes. Under the condition of applied voltage, ions in the electrolyte migrate through the ion exchange membrane, enter the mobile electrode, and are adsorbed by the carbon materials suspended therein, thereby achieving the effect of desalination. However, research on the FCDI process is still in its infancy. There are few domestic reports on FCDI desalination research, and foreign reports also mainly focus on the development of FCDI devices and the preparation of ion exchange membranes, and lack further research on the optimization of its process parameters. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art, such as lack of further research on the optimization of process parameters of FCDI devices, and to propose a desalination experimental device based on FCDI.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A desalination experimental device based on FCDI includes a support platform, an inverted U-frame is fixed on the top of the support platform, and a first peristaltic pump, a second peristaltic pump and a third peristaltic pump are sequentially arranged on the inverted U-frame. Three accommodating bottles are sequentially arranged on the lower side of the inverted U-frame, and the three accommodating bottles are respectively used to accommodate anode flowing electrode liquid, cathode flowing electrode liquid and brine. Three connecting pipes are fixed in the inverted U-frame, and the three connecting pipes are respectively connected to the three accommodating bottles, and the three connecting pipes are respectively connected to the water inlets of the first peristaltic pump, the second peristaltic pump and the third peristaltic pump. An FCDI device is fixed on the top of the inverted U-frame, and two organic glass bottles are provided on the FCDI device. A fixing device, wherein the two organic glass fixing devices are used to fix the electrode sheet on the FCDI device, the outlet pipes of the first peristaltic pump and the second peristaltic pump are respectively connected to the stainless steel interfaces at the lower ends of the two organic glass fixing devices, the water inlet of the third peristaltic pump is connected to the accommodating bottle containing saline, and the water outlet of the third peristaltic pump is connected to the FCDI device, and the first return pipe, the second return pipe and the third return pipe are fixed in the inverted U-frame, and the first return pipe, the second return pipe and the third return pipe are all connected to the FCDI device, and the first return pipe, the second return pipe and the third return pipe are respectively connected to the three accommodating bottles;

[0007] A DC regulated power supply is fixed at the top of the inverted U-frame, and a positive electrode and a negative electrode are provided in the FCDI device. The positive electrode and the negative electrode in the DC regulated power supply are electrically connected to the positive electrode and the negative electrode in the FCDI device respectively.

[0008] Three groups of connection components are provided in the inverted U frame, and the three groups of connection components are used to fix three accommodating bottles on the lower side of the inverted U frame respectively.

[0009] In a possible design, a conductivity meter for measuring the salt concentration of the outlet water is fixed to the top of the inverted U-frame.

[0010] In a possible design, each group of the connecting components includes a connecting ring fixed in an inverted U-frame, an internal thread is provided in the connecting ring, a threaded ring is fixed on the surface of the accommodating bottle, and the threaded ring is threadedly connected in the connecting ring.

[0011] In a possible design, the three containing bottles are all made of transparent glass.

[0012] In a possible design, a PLC automatic control device is provided in the inverted U-frame, and the PLC automatic control device is electrically connected to the first peristaltic pump, the second peristaltic pump, the third peristaltic pump and the DC regulated power supply respectively.

[0013] Beneficial effects

[0014] In the present invention, the FCDI-based desalination experimental device, the RO-FCDI combined process combines the advantages of reverse osmosis and capacitive deionization technology, which can reduce the pressure and energy consumption required for the reverse osmosis process, thereby reducing overall energy consumption. The energy efficiency range of the FCDI device for treating seawater is 0.22-0.46kWh / m3, and the energy consumption range of the secondary reverse osmosis is 3-6kWh / m3. Compared with the traditional secondary reverse osmosis process, it consumes 1.28-2.54kWh / m3 less energy and shows higher energy efficiency. Assuming that one device processes 500L of seawater per day, the device saves 456.3 kWh of electricity per year, and the carbon emissions for each kWh of electricity consumed are about 960g, that is, the system can reduce carbon emissions by 437.5 kg per year, which is equivalent to planting 272.9 square meters of forest;

[0015] In this utility model, the FCDI-based desalination experimental device uses chemical reagents such as disinfectants and scale inhibitors in the traditional two-stage reverse osmosis process. Improper use of these chemicals can pollute the environment. However, the RO-FCDI process can reduce the use of chemicals by approximately 10%-30%, effectively reducing the burden on the mineralization process.

[0016] In this utility model, the RO-FCDI process requires less membrane cleaning and maintenance than a two-stage reverse osmosis process, extending membrane life by approximately 20%, which reduces costs in the long term. A reverse osmosis membrane has a lifespan of approximately 2-5 years and costs approximately 1,000 yuan. This means that using the RO-FCDI process can save 200 yuan annually in membrane maintenance costs. Onboard ships, RO-FCDI installations can solve daily drinking water problems. Assuming a medium-sized ship requires 500 liters of drinking water, using this system can save 13,200 yuan annually compared to purchasing drinking water directly, increasing economic benefits by approximately 72%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a main perspective view of a desalination experimental device based on FCDI proposed in the utility model;

[0018] Figure 2 This is a partial cross-sectional view of a desalination experimental device based on FCDI proposed in the utility model;

[0019] Figure 3 This is a diagram of the FCDI desalination effect at salt concentrations of 500 mg / L and 750 mg / L for an FCDI-based desalination experimental device proposed in the utility model.

[0020] In the figure: 1. Support table; 2. Inverted U-frame; 3. First peristaltic pump; 4. Second peristaltic pump; 5. Third peristaltic pump; 6. Accommodating bottle; 7. Connecting ring; 8. Connecting pipe; 9. Threaded ring; 10. FCDI device; 11. DC regulated power supply; 12. Conductivity meter; 13. First reflux pipe; 14. Second reflux pipe; 15. Third reflux pipe. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Example 1

[0023] Reference Figure 1-Figure 3 , a desalination experimental device based on FCDI, which uses the technical field of desalination experimental equipment, includes a support platform 1, an inverted U-frame 2 is fixed on the top of the support platform 1, and a first peristaltic pump 3, a second peristaltic pump 4 and a third peristaltic pump 5 are sequentially arranged on the inverted U-frame 2. Three accommodating bottles 6 are sequentially arranged on the lower side of the inverted U-frame 2. The three accommodating bottles 6 are respectively used to accommodate the anode flowing electrode liquid, the cathode flowing electrode liquid and the brine. Three connecting pipes 8 are fixed in the inverted U-frame 2, and the three connecting pipes 8 are respectively connected to the three accommodating bottles 6. The three connecting pipes 8 are respectively connected to the water inlets of the first peristaltic pump 3, the second peristaltic pump 4 and the third peristaltic pump 5. An FCDI device 10 is fixed on the top of the inverted U-frame 2. The FCDI device 10 is provided with two Organic glass fixtures, both of which are used to fix the electrode sheets on the FCDI device 10, the outlet pipes of the first peristaltic pump 3 and the second peristaltic pump 4 are respectively connected to the stainless steel interfaces at the lower ends of the two organic glass fixtures, the water inlet of the third peristaltic pump 5 is connected to the accommodating bottle 6 for containing saline, and the water outlet of the third peristaltic pump 5 is connected to the FCDI device 10, and the first return pipe 13, the second return pipe 14 and the third return pipe 15 are fixed in the inverted U-frame 2, and the first return pipe 13, the second return pipe 14 and the third return pipe 15 are all connected to the FCDI device 10, and the first return pipe 13, the second return pipe 14 and the third return pipe 15 are respectively connected to the three accommodating bottles 6;

[0024] A DC regulated power supply 11 is fixed to the top of the inverted U-frame 2. A positive electrode and a negative electrode are provided in the FCDI device 10. The positive and negative electrodes in the DC regulated power supply 11 are electrically connected to the positive and negative electrodes in the FCDI device 10, respectively.

[0025] Start the first peristaltic pump 3 and the second peristaltic pump 4 to draw the anode flow electrode liquid and the cathode flow electrode into the FCDI device 10, and use the third peristaltic pump 5 to draw brine into the FCDI device 10 for desalination. The experimental conditions are that the water inlet flow rate is controlled at 25ml / min. The electrode liquid flow rate is 40ml / min, the voltage is 1.2V, and the treated brine concentration is 500mg / L and 750mg / L. Weigh 1g of modified material, 0.3085g of 18% aqueous graphene and 0.5553g of 10% aqueous carbon nanotubes, and 10ml of 500mg / L sodium chloride solution to prepare the electrode liquid. When running, it is set to a circulating treatment device, that is, the inlet and outlet water are in the same beaker. After 6 hours of stable operation, the concentration of NaCl was measured to determine its adsorption effect. The anode and cathode flowing electrode liquids coming out of the FCDI device 10 were returned to the two containing bottles 6 containing the anode and cathode electrode liquids through the first reflux pipe 13 and the second reflux pipe 14 respectively. The brine coming out of the FCDI device 10 was returned to the containing bottle 6 containing the brine through the third reflux pipe 15.

[0026] Adsorption capacity calculation formula:

[0027]

[0028] Where:

[0029] q——adsorption capacity (mg / g);

[0030] C0——initial concentration of simulated wastewater (mg / L);

[0031] C e ——Concentration after adsorption equilibrium (mg / L);

[0032] V——water sample volume (L);

[0033] m2——the amount of adsorbent put in (g);

[0034] The system's seawater desalination process involves continuous water inflow, while the laboratory's FCDI magnetic activated carbon solution uses cyclic adsorption. Calculated residence time in the electrode solution's N module is 2.5 minutes. The adsorption capacity corresponding to this time is determined based on the experimental adsorption curve. Theoretically, the rate at which the electrode solution adsorbs salt is equal to its desalination rate (in mg / min). The specific formula is:

[0035]

[0036] Where:

[0037] T2: experimental cycle time, s;

[0038] T1 is the time for the adsorption liquid to pass through one unit chamber b, which is 96s;

[0039] t2: 10ml adsorption solution circulation time, taken as 15s;

[0040] t1: time for the adsorption liquid to pass through one unit chamber a, which is 9.6s;

[0041] q: T2 cycle time, the adsorption amount found in the adsorption curve, taken as 2.816 mg / g;

[0042] v: volume of magnetic activated carbon solution, take 10ml / g;

[0043] Q1: The flow rate of adsorption liquid is 40 ml / min;

[0044] Q2: The flow rate of saline is 25 ml / min;

[0045] C: Salt removal capacity of brine, mg / L.

[0046] Calculations show that 1L of brine passing through an FCDI unit can absorb approximately 900mg of sodium chloride. Since theoretically, higher salt concentrations lead to faster surface adsorption (this has been confirmed in adsorption experiments with 750mg / L brine), the actual amount should be greater than 900mg. The salt concentration of effluent from a reverse osmosis process varies depending on the specific operating conditions, generally ranging from 500-1000mg / L. The World Health Organization recommends a TDS of 300-500mg / L for drinking water, which is considered optimal for both taste and health. If the goal is to reduce salt removal to below 500mg / L, a salt removal rate of ≥96% is sufficient for pretreatment and primary reverse osmosis seawater. Therefore, this FCDI unit can achieve excellent tasting desalinated seawater while effectively controlling and reducing primary reverse osmosis energy consumption. With an N-module FCDI unit processing 25ml / min of brine, the total unit can process 2.5L / min of desalinated brine, generating 3.6m³ of freshwater per day. With a total unit volume of approximately 3m³, it can theoretically meet the freshwater needs of large and small vessels at sea.

[0047] Example 2

[0048] refer to Figure 1-Figure 3 Improvements were made based on Example 1: After the material reached saturation in the adsorption experiment, a concentrated electrode solution was separated from the flow electrode using magnetic separation. Compared to gravity separation, the separation efficiency under the magnetic field was approximately 2.5 times higher. Sedimentation was complete in 2 minutes. Maintaining the same experimental conditions, the internal chamber was replaced with 10ml of water. The electrodes were reversed, and the sodium chloride in the positive and negative electrode solutions began to migrate to the central chamber. Desorption was allowed to proceed for approximately 1-2 hours, and the residual sodium chloride in the electrode material after desorption was measured. Calculations showed a material regeneration rate between 90% and 97.3%.

[0049] It also includes three groups of connecting components, all of which are arranged in the inverted U frame 2, and the three groups of connecting components are respectively used to fix the three accommodating bottles 6 on the lower side of the inverted U frame 2; each group of connecting components includes a connecting ring 7 fixed in the inverted U frame 2, and an internal thread is provided in the connecting ring 7. A threaded ring 9 is fixed on the surface of the accommodating bottle 6, and the threaded ring 9 is threadedly connected to the connecting ring 7, so that the accommodating bottle 6 and the connecting pipe 8 are conveniently and quickly connected.

[0050] However, as is well known to those skilled in the art, the working principles and wiring methods of the first peristaltic pump 3, the second peristaltic pump 4, the third peristaltic pump 5, the DC regulated power supply 11 and the electrode liquid 12 are commonplace, and are all conventional means or common knowledge, and will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0051] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A desalination experimental device based on FCDI, characterized in that: include: A support platform (1) is provided with an inverted U-frame (2) fixed on the top of the support platform (1), a first peristaltic pump (3), a second peristaltic pump (4) and a third peristaltic pump (5) are sequentially provided on the inverted U-frame (2), three accommodating bottles (6) are sequentially provided on the lower side of the inverted U-frame (2), the three accommodating bottles (6) are respectively used to accommodate anode flowing electrode liquid, cathode flowing electrode liquid and brine, three connecting pipes (8) are fixed in the inverted U-frame (2), the three connecting pipes (8) are respectively connected to the three accommodating bottles (6), and the three connecting pipes (8) are respectively connected to the water inlets of the first peristaltic pump (3), the second peristaltic pump (4) and the third peristaltic pump (5), an FCDI device (10) is fixed on the top of the inverted U-frame (2), two organic glass fixing devices are provided on the FCDI device (10), and the two organic glass fixing devices are respectively connected to the water inlets of the first peristaltic pump (3), the second peristaltic pump (4) and the third peristaltic pump (5), and an FCDI device (10) is fixed on the top of the inverted U-frame (2). The glass fixing devices are used to fix the electrode sheets on the FCDI device (10); the outlet pipes of the first peristaltic pump (3) and the second peristaltic pump (4) are respectively connected to the stainless steel interfaces at the lower ends of the two organic glass fixing devices; the water inlet of the third peristaltic pump (5) is connected to the accommodating bottle (6) for accommodating saline; the water outlet of the third peristaltic pump (5) is connected to the FCDI device (10); the first reflux pipe (13), the second reflux pipe (14) and the third reflux pipe (15) are fixed in the inverted U-frame (2); the first reflux pipe (13), the second reflux pipe (14) and the third reflux pipe (15) are all connected to the FCDI device (10); the first reflux pipe (13), the second reflux pipe (14) and the third reflux pipe (15) are respectively connected to the three accommodating bottles (6); A DC regulated power supply (11) is fixed to the top of the inverted U-frame (2), a positive electrode and a negative electrode are provided in the FCDI device (10), and the positive electrode and the negative electrode in the DC regulated power supply (11) are electrically connected to the positive electrode and the negative electrode in the FCDI device (10), respectively; Three groups of connection components are provided, and the three groups of connection components are all arranged in the inverted U frame (2). The three groups of connection components are respectively used to fix three accommodating bottles (6) on the lower side of the inverted U frame (2).

2. The FCDI-based desalination experimental device according to claim 1, characterized in that: A conductivity meter (12) for measuring the salt concentration of the outlet water is fixed to the top of the inverted U-frame (2).

3. The FCDI-based desalination experimental device according to claim 2, characterized in that: Each set of the connecting components comprises a connecting ring (7) fixed in the inverted U-frame (2), an internal thread is provided in the connecting ring (7), a threaded ring (9) is fixed on the surface of the accommodating bottle (6), and the threaded ring (9) is threadedly connected in the connecting ring (7).

4. The FCDI-based desalination experimental device according to claim 3, characterized in that: The three containing bottles (6) are all made of transparent glass.

5. The FCDI-based desalination experimental device according to claim 1, characterized in that: A PLC automatic control device is provided in the inverted U-frame (2), and the PLC automatic control device is electrically connected to the first peristaltic pump (3), the second peristaltic pump (4), the third peristaltic pump (5) and the DC regulated power supply (11), respectively.

Images