Desalted seawater conditioning system and conditioning method

Abstract

The invention belongs to the field of seawater desalination, and particularly relates to a seawater desalination water conditioning system and a conditioning method. The desalinated seawater conditioning system comprises carbon dioxide adding equipment and conditioning and filtering equipment. The carbon dioxide adding equipment is used for dissolving carbon dioxide in the seawater desalination water to realize accurate adding of the carbon dioxide, and the conditioning and filtering equipment is used for performing conditioning treatment on the seawater desalination water dissolved with the carbon dioxide and comprises a conditioning filter; the tempering filter sequentially comprises a quartz sand filling layer and a natural mineralized material filling layer from bottom to top. The natural mineralization material comprises zeolite and calcined limonite, and the mass ratio of the zeolite to the limonite is (1: 3)-(1: 5). In the desalinated sea water conditioning system, the conditioning filter equipment has higher impact load resistance, the natural mineralized material filling layer is easy to backwash, the backwash water consumption can be reduced, the conditioning filter equipment has a good conditioning effect, and the desalinated sea water subjected to conditioning treatment can reach the national drinking water standard.

Description

Technical Field

[0001] The invention relates to the technical field of seawater desalination, and in particular to a seawater desalination water conditioning system and a conditioning method. Background Art

[0002] Desalination technology can remove most of the dissolved salts in seawater through reverse osmosis and other technologies, making the salt content of the desalinated water extremely low. However, the desalinated water used as drinking water is bland and tasteless, lacks essential minerals such as Ca 2+ and Mg 2+ In addition, the quality of desalinated water is unstable and highly corrosive and erosive, especially to metal pipes. When desalinated water is used alone or mixed with other water sources, it may cause corrosion of the pipe network of the water supply system, which will not only shorten the service life of the equipment, but also cause the "red water" phenomenon, seriously affecting normal use.

[0003] The prior art generally adjusts the pH, alkalinity and hardness of desalinated water by conditioning it to prevent corrosion of the pipe network of its water delivery system and is beneficial to human health. Current desalinated water conditioning methods include adding reagents, mixing with other water sources, and dissolving ore methods. Among them, the dissolving ore method is currently the simplest and most widely used method for conditioning desalinated water. The ore commonly used in the dissolving ore method is food-grade limestone. However, the impact load resistance of food-grade limestone is not high. In the case of a sudden increase in the amount of water to be treated, the effluent water quality may not meet the standard, and the backwashing efficiency is low, resulting in a large amount of backwashing water consumption.

[0004] Therefore, it is necessary to provide a seawater desalination water conditioning system and method with stronger impact load resistance and higher backwashing efficiency. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the above technical problems, the present invention provides a desalination water conditioning system and conditioning method, which can improve the impact load resistance, improve the backwashing efficiency, and reduce the water consumption of backwashing.

[0006] (II) Technical solution In order to achieve the above object, the main technical solutions adopted by the present invention include: In a first aspect, the present invention provides a desalinated water conditioning system, including a carbon dioxide dosing device and a conditioning and filtering device; The carbon dioxide dosing equipment is used to dissolve carbon dioxide in desalinated water; The conditioning and filtering equipment is used to condition desalinated seawater containing dissolved carbon dioxide, and the conditioning and filtering equipment comprises a conditioning filter, and the conditioning filter comprises a quartz sand filling layer and a natural mineralized material filling layer in order from bottom to top; In the natural mineralized material filling layer, the natural mineralized material includes zeolite and calcined wooden fish stone, and the mass ratio of zeolite to wooden fish stone is 1:3-1:5.

[0007] In the desalination water conditioning system as described above, preferably, the calcination temperature of the wooden fish stone is 400-600° C., and the calcination time is 1-2 hours.

[0008] In the desalination water conditioning system as described above, preferably, the thickness of the quartz sand filling layer is 0.15-0.25m, and the particle size of the quartz sand in the quartz sand filling layer is 2.5-5.0mm; the thickness of the natural mineralized material filling layer is 1.8-2.2m, and the particle size of the zeolite and wooden fish stone is 0.5-1.5mm. The particle sizes of the quartz sand, zeolite and wooden fish stone can be selected from any value in the respective limited ranges, or can be distributed in the entire particle size range.

[0009] In the desalination water conditioning system as described above, preferably, the carbon dioxide dosing equipment comprises a reverse osmosis water production bypass pressurizing device and a carbon dioxide storage device, a carbon dioxide conversion device and a carbon dioxide dosing mixing device connected in sequence; Both ends of the reverse osmosis water production bypass booster device are respectively connected to the seawater desalination water production bypass pipeline and the carbon dioxide dosing and mixing device.

[0010] In the desalination water conditioning system as described above, preferably, the reverse osmosis water production bypass boosting device includes a first boosting pump, the carbon dioxide storage device includes a carbon dioxide storage tank, and the carbon dioxide conversion device includes an evaporator and a pressure reducing and stabilizing component; The other end of the carbon dioxide dosing and mixing device is connected to the desalinated water main pipeline, and the desalinated water main pipeline is also connected to the conditioning filter.

[0011] In the desalinated water conditioning system as described above, preferably, the conditioning and filtering equipment further comprises a water-gas distribution layer disposed below the quartz sand filling layer; The water vapor distribution layer includes a filter plate and a plurality of water distribution structures arranged on the filter plate.

[0012] In the desalinated water conditioning system as described above, preferably, the conditioning filter further comprises a natural mineralized material dosing device located above the natural mineralized material filling layer; The natural mineralized material dosing device comprises a storage bin and a feeding pipe connected to the storage bin. The natural mineralized material is stored in the storage bin. An automatic feeding port is also provided at the upper end of the storage bin.

[0013] The desalination water conditioning system as described above preferably further comprises an air-water combined backwashing device connected to the conditioning filter; The air-water combined backwashing equipment comprises a backwashing fan and a backwashing water booster pump.

[0014] In a second aspect, the present invention further provides a method for conditioning seawater desalinated water using the above-mentioned seawater desalinated water conditioning system, comprising the following steps: S1: adding carbon dioxide to desalinated water through a carbon dioxide dosing device to obtain desalinated water containing dissolved carbon dioxide; S2: Desalinated seawater containing dissolved carbon dioxide passes through the quartz sand filling layer and the natural mineral material filling layer of the conditioning filter in turn, and is filtered and tempered to obtain drinking water that meets drinking standards.

[0015] In the desalinated water conditioning method as described above, preferably, in step S1, carbon dioxide is added to the desalinated water from the desalinated water bypass pipeline by a carbon dioxide adding device to obtain desalinated water containing dissolved carbon dioxide; In step S2, desalinated water containing dissolved carbon dioxide enters the desalinated water main pipeline, and then passes through the quartz sand filling layer and the natural mineral material filling layer of the conditioning filter in sequence, and is filtered and tempered to obtain drinking water that meets drinking standards.

[0016] (III) Beneficial effects The desalination water conditioning system of the present invention uses zeolite and calcined woodfish stone as natural mineralized materials. Compared with existing chemical agents, zeolite and woodfish stone as mineralized materials have stronger impact load resistance. Even if the water intake suddenly increases to 120% of the normal treatment flow, the effluent water quality can still stably meet the standards. This high stability and adaptability provide a guarantee for the wide application of the system under different conditions.

[0017] The backwashing of the natural mineralized material filling composed of zeolite and calcined wood fish stone is more efficient, which can greatly reduce the water consumption for backwashing, effectively reduce the burden of water treatment, and improve the efficiency of water resource utilization.

[0018] Zeolite and calcined wooden fish stone contain a variety of mineral components. The surface of the calcined wooden fish stone becomes loose and porous, which is conducive to the entry of water molecules and enhances the dissolution of minerals. Due to its own structural characteristics and the imbalance of coordination bonds, zeolite, when used in combination with calcined wooden fish stone, can balance the ion concentration in the water body, effectively increase the hardness of the water, and adjust the low pH value of desalinated water to a range suitable for drinking. At the same time, zeolite and calcined wooden fish stone can also add an appropriate amount of alkaline substances to help stabilize the alkalinity in the water quality and prevent pipeline corrosion. After being tempered by the tempering and filtration equipment, the pH value, alkalinity and hardness of the desalinated water can meet the requirements of the national drinking water standards, with a good tempering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the desalination water conditioning system of the present invention; Figure 2 This is a flow chart of carbon dioxide addition in the present invention; Figure 3 It is a flow chart of the conditioning and filtering process in the present invention.

[0020] [Description of Reference Numerals] 1: CO2 storage tank; 2: Evaporator; 3: First booster pump; 4: CO2 dosing and mixing device; 5: Backwash water booster pump; 6: Conditioning filter; 7: Backwash fan; 8: Water production tank; 9: Water supply pump; 10: UV sterilizer; 11: First desalinated water inlet; 12: Second desalinated water inlet; 13: Third desalinated water inlet 14: Conditioning water outlet. DETAILED DESCRIPTION

[0021] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figure 1-Figure 3 As shown, the present invention provides a desalinated water conditioning system, including a carbon dioxide dosing device and a conditioning and filtering device. The carbon dioxide dosing device is used to dissolve carbon dioxide in desalinated water and accurately add carbon dioxide to the desalinated water. The conditioning and filtering device is used to condition the desalinated water dissolved with carbon dioxide, and the conditioning and filtering device includes a conditioning filter 6, and the conditioning filter 6 includes a quartz sand filling layer and a natural mineralized material filling layer from bottom to top. In the natural mineralized material filling layer, the natural mineralized material includes zeolite and calcined wooden fish stone, and the mass ratio of zeolite to wooden fish stone is 1:3-1:5.

[0023] The present invention uses zeolite and calcined wooden fish stone as natural mineralized materials. Compared with existing chemical agents, zeolite and wooden fish stone as mineralized materials have stronger impact load resistance. Even if the inlet water volume suddenly increases to 120% of the normal treatment flow, the effluent water quality is still stable and meets the standards. This high stability and adaptability provide a guarantee for the wide application of the system under different conditions.

[0024] The backwashing of the natural mineralized material filling composed of zeolite and calcined wood fish stone is more efficient, which can greatly reduce the water consumption for backwashing, effectively reduce the burden of water treatment, and improve the efficiency of water resource utilization.

[0025] The invention patent application with publication number CN111392934A believes that the precipitation amount of various mineral elements of wooden fish stone is not prominent, and it is not suitable for the mineralization treatment of desalinated seawater. However, the researchers of the present invention have found through long-term research and experiments that wooden fish stone can be calcined to improve its solubility. Wooden fish stone contains multiple mineral components. The surface of the calcined wooden fish stone becomes loose and porous, which is conducive to the entry of water molecules, and the solubility of the minerals therein is enhanced. In addition to calcining, the present invention also uses wooden fish stone and zeolite in combination as filter material. Zeolite, due to its own structural characteristics and the imbalance of coordination bonds, is used in combination with the calcined wooden fish stone, which can balance the ion concentration in the water body, effectively improve the hardness of water, and adjust the too low pH value of seawater desalination water to make it reach a suitable range for drinking. At the same time, zeolite and the calcined wooden fish stone can also supplement an appropriate amount of alkaline substances to help stabilize the alkalinity in the water quality and prevent pipeline corrosion. After being tempered by the tempering and filtration equipment, the pH value, alkalinity and hardness of the desalinated seawater can meet the requirements of the national drinking water standards, and has a good tempering effect.

[0026] In the present invention, the best conditioning effect on desalinated water is achieved when zeolite and calcined wooden fish stone are mixed in a mass ratio of 1:3-1:5. If the mass ratio is exceeded or uncalcined wooden fish stone is used, the conditioning effect may be affected.

[0027] It should be noted that the desalinated seawater of the present invention can be an aqueous solution obtained by treating seawater by reverse osmosis, electrodialysis, distillation, freezing separation and the like.

[0028] Preferably, the calcination temperature of the wooden fish stone in the present invention is 400-600°C, and the calcination time is 1-2h. The thickness of the quartz sand filling layer is 0.15-0.25m, the particle size of the quartz sand in the quartz sand filling layer is 2.5-5.0mm, the thickness of the natural mineralized material filling layer is 1.8-2.2m, and the particle size of the zeolite and wooden fish stone is 0.5-1.5mm.

[0029] The carbon dioxide dosing equipment adds carbon dioxide to the desalinated water. Carbon dioxide dissolves in water to form carbonic acid, which helps to increase the bicarbonate ions in the water and improve the alkalinity. In addition, carbonic acid can also promote the mineralization of natural mineralized materials. Zeolite and calcined wooden fish stone can better release trace elements beneficial to the human body in desalinated water with dissolved carbon dioxide, such as calcium, magnesium, silicate, strontium, molybdenum, zinc, selenium, etc., to increase the hardness and mineral content of the water body and further optimize the water quality.

[0030] Preferably, the carbon dioxide dosing equipment includes a reverse osmosis water production bypass boosting device and a carbon dioxide storage device, a carbon dioxide conversion device and a carbon dioxide dosing mixing device 4 connected in sequence. The two ends of the reverse osmosis water production bypass boosting device are respectively connected to the desalination water production bypass pipeline and the carbon dioxide dosing mixing device 4. The above-mentioned devices can be connected and adjusted through relevant pipelines, valves and other components, and control instruments can also be set to monitor and control each process.

[0031] The carbon dioxide dosing equipment also includes related monitoring instruments such as pressure gauges, temperature meters, pH meters, flow meters, and control modules.

[0032] The reverse osmosis water production bypass booster device specifically includes a first booster pump 3, a carbon dioxide storage device includes a carbon dioxide storage tank 1, and a carbon dioxide conversion device includes an evaporator 2 and a pressure reducing and stabilizing component. The evaporator 2 is connected to the carbon dioxide storage tank 1 and the pressure reducing and stabilizing component through pipelines and valves, and the pressure reducing and stabilizing component is connected to the carbon dioxide dosing and mixing device 4. The carbon dioxide storage tank 1 can adopt a dedicated vacuum insulation low-temperature storage tank, and various valves and joints for operation can be set to supply liquid to the vaporizer, and a pressure gauge, a liquid level gauge, etc. are provided to observe the pressure and liquid level in the tank. In addition. Safety devices can also be set in the inner and outer cylinders to ensure safe use by users. The evaporator 2 can be an integrated evaporator 2 for converting low-temperature liquid CO2 into high-pressure gaseous CO2. The other end of the carbon dioxide dosing and mixing device 4 is connected to the desalination water main line, and the desalination water main line is also connected to the conditioning filter 6.

[0033] Low-temperature liquid CO2 is stored in a carbon dioxide storage device, and the liquid CO2 can be converted into high-pressure gaseous CO2 through a valve group and an evaporator 2. The high-pressure gaseous CO2 is converted into low-pressure gaseous CO2 through a pressure reducing and stabilizing component, and then the low-pressure gaseous CO2 is quantitatively added to the carbon dioxide dosing and mixing device 4 through a regulating valve, a flow meter, and a microporous doser.

[0034] like Figure 2As shown, the desalinated water in the desalinated water bypass pipeline is pressurized by the reverse osmosis water bypass pressurizing device and then enters the carbon dioxide dosing and mixing device 4. At the same time, low-pressure gaseous CO2 also enters the carbon dioxide dosing and mixing device 4. Under the action of the carbon dioxide dosing and mixing device 4, the desalinated water from the desalinated water bypass pipeline is fully mixed with CO2. The effluent of the carbon dioxide dosing and mixing device 4, that is, the desalinated water with dissolved CO2, is connected to the desalinated water main pipeline. The desalinated water with dissolved CO2 enters the tempering filter 6 along with the desalinated water in the water main pipeline for tempering treatment.

[0035] Preferably, the conditioning and filtering equipment also includes a water vapor distribution layer arranged below the quartz sand filling layer, and a natural mineralized material dosing device located above the natural mineralized material filling layer. The water vapor distribution layer includes a filter plate, and a plurality of water distribution structures arranged on the filter plate, and the water distribution structure can be a water distribution cap, etc. The natural mineralized material dosing device includes a storage bin and a feeding pipe connected to the storage bin, and the storage bin stores natural mineralized materials. An automatic feed port is also provided at the upper end of the storage bin. Similarly, the conditioning and filtering equipment also includes relevant monitoring instruments and control modules such as pressure gauges, temperature meters, pH meters, flow meters, etc.

[0036] The main function of the conditioning and filtering equipment is to condition the desalinated seawater water with CO2 added. The conditioning and filtering equipment includes a conditioning filter 6. After water / air enters from the bottom of the conditioning filter 6, the conditioning filter 6 can be divided into the following areas from bottom to top: water / air distribution area, quartz sand filling area, natural mineralized material filling area, upper water rising overflow area after conditioning, and natural mineralized material delivery area. The water / air distribution area corresponds to the area where the water vapor distribution layer is located. The filter plate and the multiple water distribution caps arranged on the filter plate can form a flat air / water distribution platform. The various components of the water vapor distribution layer and its contact surface with the wall of the conditioning filter 6 need to be sealed with lining rubber. The quartz sand filling layer is directly filled on the water vapor distribution layer. The quartz sand can promote uniform distribution of gas and water, remove tiny particles in the water body, prevent fine impurities and sol substances from clogging the water distribution cap, and ensure uniform and smooth water distribution. The natural mineralized material filling layer is located above the quartz sand filling layer. The overflow area of ​​the upper water after conditioning refers to the space between the natural mineralized material filling layer area and the overflow channel of the conditioned water after the conditioning treatment. The overflow area of ​​the upper water after conditioning has a certain thickness, which can avoid the overflow of fine particles and impurities dissolved in zeolite and wooden fish stone, and ensure that the turbidity of the outlet water is less than 1NTU. The natural mineralized material delivery area corresponds to the area where the natural mineralized material dosing device is located. The natural mineralized materials stored in the storage bin can fall directly onto the natural mineralized material filling layer through the feeding pipe under the action of gravity to replenish the natural mineralized materials. The natural mineralized materials in the feeding pipe cross the overflow area of ​​the upper water after conditioning and directly reach the surface of the natural mineralized material filling layer, so that even if the natural mineralized materials fall, it will not cause turbidity in the water layer.

[0037] Further preferably, the conditioning filter device further comprises an air-water combined backwashing device connected to the conditioning filter 6, the air-water combined backwashing device specifically comprising a backwashing fan 7 and a backwashing water booster pump 5, the backwashing fan 7 may be a Roots blower. The air-water combined backwashing process can remove impurities remaining in the conditioning filter 6 due to long-term operation, so as to restore the pollution interception capacity of the conditioning filter 6. Figure 3 As shown, the backwash water of the air-water combined backwashing equipment comes from seawater desalination water. According to actual operation data, the air-water combined backwashing times of the conditioning and filtering equipment of the present invention is 2-3 times per year, with high flushing efficiency and less water required for flushing.

[0038] like Figure 1-Figure 3 As shown, the desalinated water in the present invention enters different structures from multiple inlets for different treatments. Figure 1The arrows in the middle indicate the flow directions of desalinated water and tempered water. Specifically, desalinated water can enter the first booster pump 3 from the first desalinated water inlet 11 for boosting treatment; desalinated water can enter the evaporator 2 from the second desalinated water inlet 12 for initial contact with carbon dioxide; desalinated water can also enter the tempering filter 6 from the second desalinated water inlet 12, mix with desalinated water in which carbon dioxide is dissolved, and perform tempering and filtering treatment in the tempering filter 6; desalinated water can also enter the backwash water booster pump 5 from the third desalinated water inlet 13 for backwashing.

[0039] The present invention also provides a method for conditioning seawater desalination water using the above-mentioned seawater desalination water conditioning system, comprising the following steps: S1: adding carbon dioxide into desalinated water through a carbon dioxide dosing device to obtain desalinated water containing dissolved carbon dioxide.

[0040] S2: The desalinated seawater containing dissolved carbon dioxide passes through the quartz sand filling layer and the natural mineralized material filling layer of the conditioning filter 6 in sequence, and is filtered and tempered to obtain drinking water that meets drinking standards.

[0041] Preferably, in step S1, carbon dioxide is added to the desalinated water from the desalinated water bypass pipeline by a carbon dioxide adding device to obtain desalinated water dissolved with carbon dioxide. In step S2, the desalinated water dissolved with carbon dioxide enters the desalinated water main pipeline, and the water enters from the bottom of the conditioning filter 6, passes through the water vapor distribution layer, the quartz sand filling layer and the natural mineralized material filling layer in sequence, and is filtered and tempered. The treated water enters the water production tank 8, and then enters the ultraviolet sterilizer 10 through the water delivery pump 9 for sterilization, so as to obtain drinking water that meets the drinking standards for users, and the obtained tempered water / drinking water flows out from the tempered water outlet 14.

[0042] The control module in the desalination water conditioning system can be controlled by PLC, and a DCS communication interface is reserved on the PLC end to access the DCS auxiliary control water network. The start and stop control, operation status display, alarm and control under abnormal or accident conditions of the desalination water conditioning system can be completed on the local terminal and auxiliary control network, and the operation of the whole system is automatically controlled to the extent of unmanned operation.

[0043] In order to further clarify the scheme of the present invention and its technical advancement, the following is a description in conjunction with specific embodiments and technical effects.

[0044] Example 1

[0045] This embodiment provides a desalinated water conditioning system, including a carbon dioxide dosing device and a conditioning and filtering device.

[0046] The carbon dioxide dosing equipment includes a reverse osmosis water production bypass booster, a carbon dioxide storage tank, a carbon dioxide conversion device and a carbon dioxide dosing mixing device connected in sequence, as well as a pressure gauge, a temperature meter, a pH meter, a flow meter and a control module.

[0047] The reverse osmosis water production bypass booster device includes a first booster pump, and both ends of the first booster pump are connected to the seawater desalination water production bypass pipeline and the carbon dioxide dosing and mixing device through pipelines and valves. Low-temperature liquid CO2 is stored in the carbon dioxide storage device, and the carbon dioxide conversion device includes an evaporator and a pressure reducing and stabilizing component. The evaporator is connected to the carbon dioxide storage tank and the pressure reducing and stabilizing component through pipelines and valves, and the pressure reducing and stabilizing component is connected to the carbon dioxide dosing and mixing device. The water outlet of the carbon dioxide dosing and mixing device is connected to the seawater desalination water production main pipeline, and the seawater desalination water production main pipeline is also connected to the bottom water inlet of the conditioning filter.

[0048] The conditioning and filtration equipment includes a conditioning filter, which includes, from bottom to top, a water-gas distribution layer, a quartz sand filling layer, a natural mineralized material filling layer, and a natural mineralized material dosing device located above the natural mineralized material filling layer, and also includes related pressure gauges, temperature meters, pH meters, flow meters and control modules. The conditioning filter is also connected to a gas-water combined backwashing device, which includes a Roots blower and a backwash water booster pump. The water flow after conditioning treatment is confined to the space between the natural mineralized material filling layer and the conditioning water overflow channel. The water-gas distribution layer includes a filter plate, and a plurality of water distribution caps arranged on the filter plate. The natural mineralized material dosing device includes a storage bin and a feeding pipe connected to the storage bin, in which the natural mineralized material is stored, and an automatic feed port is also provided at the upper end of the storage bin.

[0049] The natural mineralized materials in the natural mineralized material filling layer include zeolite and calcined wooden fish stone, and the mass ratio of zeolite to wooden fish stone is 1:4. The calcination temperature of wooden fish stone is 500℃, and the calcination time is 2h. The thickness of the quartz sand filling layer is 0.2m, and the average particle size of the quartz sand in the quartz sand filling layer is 4.2mm. The thickness of the natural mineralized material filling layer is 2.0m, and the average particle size of zeolite and wooden fish stone is 1.0mm.

[0050] The above control modules are all controlled by PLC, and a DCS communication interface is reserved on the PLC end.

[0051] The desalinated water is tempered by the desalinated water conditioning system of this embodiment, and the tempered water enters the water production tank, and then enters the ultraviolet sterilizer through the water delivery pump for sterilization to obtain drinking water. The pH value of the desalinated water before the conditioning is 6.58, the total hardness is 6.52 mg / L, the total alkalinity is 4.03 mg / L, the total dissolved solids are 141.91 mg / L, the LSI is -2.53, the sodium content is 52.38 mg / L, the calcium content is 1.21 mg / L, the magnesium content is 0.85 mg / L, the metasilicic acid content is <1 mg / L, and the strontium content is <0.05 mg / L.

[0052] The pH value of the drinking water obtained by the tempering treatment in this embodiment is 7.98, the total hardness is 191.91 mg / L, the total alkalinity is 62.33 mg / L, the total dissolved solids are 382.53 mg / L, the LSI is 0.05, the sodium content is 52.37 mg / L, the calcium content is 56.68 mg / L, the magnesium content is 12.23 mg / L, the metasilicic acid content is 5.3 mg / L, the strontium content is 0.28 mg / L, and the turbidity is <1NTU.

[0053] Example 2

[0054] This embodiment provides a desalination water conditioning system, which is different from the embodiment 1 in that the mass ratio of zeolite to wooden fish stone in the natural mineralized material is 1:3, the calcination temperature of wooden fish stone is 600°C, and the calcination time is 1h. The thickness of the quartz sand filling layer is 0.15m, the average particle size of the quartz sand in the quartz sand filling layer is 2.5mm, the thickness of the natural mineralized material filling layer is 1.8m, and the average particle size of zeolite and wooden fish stone is 1.5mm.

[0055] The desalinated water is tempered by the desalinated water conditioning system of this embodiment, and the water after the conditioning enters the water production tank, and then enters the ultraviolet sterilizer through the water delivery pump for sterilization to obtain drinking water. The pH value of the desalinated water before the conditioning is 6.89, the total hardness is 8.66 mg / L, the total alkalinity is 8.30 mg / L, the total dissolved solids are 163.05 mg / L, the LSI is -3.42, the sodium content is 58.23 mg / L, the calcium content is 1.62 mg / L, the magnesium content is 1.12 mg / L, the metasilicic acid content is <1 mg / L, and the strontium content is <0.05 mg / L.

[0056] The pH value of the drinking water obtained by the tempering treatment in this embodiment is 8.14, the total hardness is 209.15 mg / L, the total alkalinity is 65.52 mg / L, the total dissolved solids are 417.59 mg / L, the LSI is 0.24, the sodium content is 58.20 mg / L, the calcium content is 60.12 mg / L, the magnesium content is 14.33 mg / L, the metasilicic acid content is 6.3 mg / L, the strontium content is 0.36 mg / L, and the turbidity is <1NTU.

[0057] Example 3

[0058] This embodiment provides a desalination water conditioning system, which is different from the embodiment 1 in that the water inlet flow rate is 110% of that in the embodiment 1, the mass ratio of zeolite to wooden fish stone in the natural mineralized material is 1:5, the calcination temperature of wooden fish stone is 400°C, and the calcination time is 2h. The thickness of the quartz sand filling layer is 0.25m, the average particle size of the quartz sand in the quartz sand filling layer is 5.0mm, the thickness of the natural mineralized material filling layer is 2.2m, and the average particle size of the zeolite and wooden fish stone is 0.5mm.

[0059] The desalinated water is tempered by the desalinated water conditioning system of this embodiment, and the tempered water enters the water production tank, and then enters the ultraviolet sterilizer through the water delivery pump for sterilization to obtain drinking water. The pH value of the desalinated water before the conditioning is 6.74, the total hardness is 11.30 mg / L, the total alkalinity is 10.58 mg / L, the total dissolved solids are 167.09 mg / L, the LSI is -3.28, the sodium content is 58.97 mg / L, the calcium content is 2.45 mg / L, the magnesium content is 1.26 mg / L, the metasilicic acid content is <1 mg / L, and the strontium content is <0.05 mg / L.

[0060] The pH value of the drinking water obtained by the tempering treatment in this embodiment is 8.07, the total hardness is 247.01 mg / L, the total alkalinity is 80.87 mg / L, the total dissolved solids are 446.16 mg / L, the LSI is 0.29, the sodium content is 58.92 mg / L, the calcium content is 69.20 mg / L, the magnesium content is 15.38 mg / L, the metasilicic acid content is 6.8 mg / L, the strontium content is 0.46 mg / L, and the turbidity is <1NTU.

[0061] Example 4

[0062] This embodiment provides a desalination water conditioning system, which is different from the embodiment 1 in that the water inlet flow rate is 120% of that in the embodiment 1, the mass ratio of zeolite to wooden fish stone in the natural mineralized material is 1:4.5, the calcination temperature of wooden fish stone is 450°C, and the calcination time is 1.5h. The thickness of the quartz sand filling layer is 0.22m, the average particle size of the quartz sand in the quartz sand filling layer is 3.0mm, the thickness of the natural mineralized material filling layer is 1.9m, and the average particle size of the zeolite and wooden fish stone is 1.2mm.

[0063] The desalinated water is tempered by the desalinated water conditioning system of this embodiment, and the water after the conditioning enters the water production tank, and then enters the ultraviolet sterilizer through the water delivery pump for sterilization to obtain drinking water. The pH value of the desalinated water before the conditioning is 6.71, the total hardness is 15.37 mg / L, the total alkalinity is 13.92 mg / L, the total dissolved solids are 203.14 mg / L, the LSI is -3.09, the sodium content is 70.86 mg / L, the calcium content is 3.22 mg / L, the magnesium content is 1.78 mg / L, the metasilicic acid content is <1 mg / L, and the strontium content is <0.05 mg / L.

[0064] The pH value of the drinking water obtained by the tempering treatment in this embodiment is 7.86, the total hardness is 207.51 mg / L, the total alkalinity is 72.07 mg / L, the total dissolved solids are 444.10 mg / L, the LSI is 0.01, the sodium content is 70.81 mg / L, the calcium content is 59.63 mg / L, the magnesium content is 14.23 mg / L, the metasilicic acid content is 6.52 mg / L, the strontium content is 0.33 mg / L, and the turbidity is <1NTU.

[0065] All indicators of the drinking water obtained in Examples 1-4 above are in compliance with the ranges specified in the "Sanitary Standard for Drinking Water" GB 5749-2022 and the "Water Quality Requirements for Reverse Osmosis Desalination Product Water" GB / T 43230-2023.

[0066] In addition, the desalination water conditioning system of Examples 1-4 needs to be backwashed 2 or 3 times per year. Compared with using food-grade limestone as the mineralizing material, the amount of desalination water consumed during backwashing in Examples 1-4 is reduced by about 30%.

[0067] Comparative Example 1 This embodiment provides a desalination water conditioning system, which is different from the embodiment 1 in that the wooden fish stone is not calcined.

[0068] The desalinated water is conditioned by the desalinated water conditioning system of this comparative example, and the conditioned water enters the water production tank, and then enters the ultraviolet sterilizer through the water delivery pump for sterilization to obtain drinking water. The pH value of the desalinated water before conditioning is 6.51, the total hardness is 9.88 mg / L, the total alkalinity is 10.10 mg / L, the total dissolved solids are 237.92 mg / L, the LSI is -3.61, the sodium content is 87.5 mg / L, the calcium content is 2.11 mg / L, the magnesium content is 1.12 mg / L, the metasilicic acid content is <1 mg / L, and the strontium content is <0.05 mg / L.

[0069] The pH value of the drinking water obtained by the conditioning treatment in this comparative example is 6.84, the total hardness is 65.53 mg / L, the total alkalinity is 37.10 mg / L, the total dissolved solids are 311.98 mg / L, the LSI is -1.90, the sodium content is 87.52 mg / L, the calcium content is 14.32 mg / L, the magnesium content is 7.23 mg / L, the orthosilicic acid content is 2.24 mg / L, the strontium content is 0.08 mg / L, and the turbidity is <1NTU.

[0070] The above water parameters show that the surface of uncalcined wooden fish stone is relatively dense, and the mineral dissolution is poor, so the overall mineralization efficiency is reduced, the total alkalinity does not reach the range specified in the "Sanitary Standard for Drinking Water" GB 5749-2022 and the "Water Quality Requirements for Reverse Osmosis Desalination Products" GB / T 43230-2023, and the mineral content is insufficient, and the supplementary effect of elements such as calcium, magnesium, orthosilicic acid, and strontium is significantly weakened. In addition, the uncalcined wooden fish stone has a poor effect on adjusting the pH value of desalinated water, which is still low.

[0071] Comparative Example 2 This embodiment provides a desalinated water conditioning system, which is different from Embodiment 1 in that the mass ratio of zeolite to wooden fish stone in the natural mineralized material is 1:1.

[0072] The desalinated water is conditioned by the desalinated water conditioning system of this comparative example, and the conditioned water enters the water production tank, and then enters the ultraviolet sterilizer through the water delivery pump for sterilization to obtain drinking water. The pH value of the desalinated water before conditioning is 6.67, the total hardness is 7.30 mg / L, the total alkalinity is 8.73 mg / L, the total dissolved solids are 178.47 mg / L, the LSI is -3.70, the sodium content is 65.48 mg / L, the calcium content is 1.32 mg / L, the magnesium content is 0.98 mg / L, the metasilicic acid content is <1 mg / L, and the strontium content is <0.05 mg / L.

[0073] The pH value of the drinking water obtained by the conditioning treatment in this comparative example is 7.35, the total hardness is 43.91 mg / L, the total alkalinity is 55.89 mg / L, the total dissolved solids are 242.17 mg / L, the LSI is -1.34, the sodium content is 65.49 mg / L, the calcium content is 10.36 mg / L, the magnesium content is 4.38 mg / L, the orthosilicic acid content is 1.21 mg / L, the strontium content is 0.06 mg / L, and the turbidity is <1NTU.

[0074] It can be seen from the above water parameters that the content of wooden fish stone in this comparative example is low, and the minerals provided by wooden fish stone are reduced, resulting in the water hardness failing to meet the range specified in the "Sanitary Standards for Drinking Water" GB 5749-2022 and the "Water Quality Requirements for Reverse Osmosis Seawater Desalination Products" GB / T 43230-2023, and there are fewer alkaline substances in the water and the mineral content is insufficient.

[0075] Comparative Example 3 This embodiment provides a desalinated water conditioning system, which is different from the embodiment 1 in that the mass ratio of zeolite to wooden fish stone in the natural mineralized material is 1:8.

[0076] The desalinated water is conditioned by the desalinated water conditioning system of this comparative example, and the conditioned water enters the water production tank, and then enters the ultraviolet sterilizer through the water delivery pump for sterilization to obtain drinking water. The pH value of the desalinated water before conditioning is 6.91, the total hardness is 9.266 mg / L, the total alkalinity is 10.09 mg / L, the total dissolved solids are 188.87 mg / L, the LSI is -3.34, the sodium content is 68.56 mg / L, the calcium content is 1.55 mg / L, the magnesium content is 1.31 mg / L, the metasilicic acid content is <1 mg / L, and the strontium content is <0.05 mg / L.

[0077] The pH value of the drinking water obtained by the conditioning treatment in this comparative example is 8.46, the total hardness is 323.47 mg / L, the total alkalinity is 122.76 mg / L, the total dissolved solids are 662.62 mg / L, the LSI is 1.0, the sodium content is 96.37 mg / L, the calcium content is 89.31 mg / L, the magnesium content is 24.39 mg / L, the orthosilicic acid content is 11.54 mg / L, the strontium content is 0.76 mg / L, and the turbidity is <1NTU.

[0078] It can be seen from the above water parameters that the content of wooden fish stone in this comparative example is too high. Wooden fish stone contains more minerals and has good solubility. Excessive dissolution of minerals leads to increased total hardness and total alkalinity of the water body, unbalanced mineral precipitation, affecting taste and health, and LSI ≥ 1. The water quality does not meet the range specified in the "Sanitary Standards for Drinking Water" GB 5749-2022 and "Water Quality Requirements for Reverse Osmosis Seawater Desalination Products" GB / T 43230-2023, and there is a tendency of serious scaling.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A desalination water conditioning system, characterized in that: Including carbon dioxide dosing equipment and conditioning and filtration equipment; The carbon dioxide dosing equipment is used to dissolve carbon dioxide in desalinated water; The conditioning and filtering equipment is used to condition desalinated seawater containing dissolved carbon dioxide, the conditioning and filtering equipment comprising a conditioning filter (6), the conditioning filter (6) comprising, from bottom to top, a quartz sand filling layer and a natural mineralized material filling layer; In the natural mineralized material filling layer, the natural mineralized material includes zeolite and calcined wooden fish stone, and the mass ratio of zeolite to wooden fish stone is 1:3-1:

5.

2. The desalination water conditioning system according to claim 1, characterized in that: The calcination temperature of wooden fish stone is 400-600℃, and the calcination time is 1-2h.

3. The desalination water conditioning system according to claim 1, characterized in that: The thickness of the quartz sand filling layer is 0.15-0.25m, and the particle size of the quartz sand in the quartz sand filling layer is 2.5-5.0mm; the thickness of the natural mineralized material filling layer is 1.8-2.2m, and the particle size of zeolite and wooden fish stone is 0.5-1.5mm.

4. The desalination water conditioning system according to claim 1, characterized in that: The carbon dioxide dosing equipment comprises a reverse osmosis water production bypass pressurizing device and a carbon dioxide storage device, a carbon dioxide conversion device and a carbon dioxide dosing mixing device (4) connected in sequence; Both ends of the reverse osmosis water production bypass booster device are respectively connected to the seawater desalination water production bypass pipeline and the carbon dioxide dosing and mixing device (4).

5. The desalination water conditioning system according to claim 4, characterized in that: The reverse osmosis water production bypass boosting device comprises a first boosting pump (3), the carbon dioxide storage device comprises a carbon dioxide storage tank (1), and the carbon dioxide conversion device comprises an evaporator (2) and a pressure reducing and stabilizing component; The other end of the carbon dioxide dosing and mixing device (4) is connected to a main water pipeline of desalinated water, and the main water pipeline of desalinated water is also connected to the conditioning filter (6).

6. The desalination water conditioning system according to claim 1 or 5, characterized in that: The conditioning filter (6) further comprises a water-gas distribution layer arranged below the quartz sand filling layer; The water vapor distribution layer includes a filter plate and a plurality of water distribution structures arranged on the filter plate.

7. The desalination water conditioning system according to claim 1 or 5, characterized in that: The conditioning and filtering equipment also includes a natural mineralized material dosing device located above the natural mineralized material filling layer; The natural mineralized material dosing device comprises a storage bin and a feeding pipe connected to the storage bin. The natural mineralized material is stored in the storage bin. An automatic feeding port is also provided at the upper end of the storage bin.

8. The desalination water conditioning system according to claim 1, characterized in that: The desalinated water conditioning system further comprises an air-water combined backwashing device connected to the conditioning filter (6); The air-water combined backwashing equipment comprises a backwashing fan (7) and a backwashing water booster pump (5).

9. A method for conditioning seawater desalination water using the seawater desalination water conditioning system according to any one of claims 1 to 8, characterized in that: The steps include: S1: adding carbon dioxide to desalinated water through a carbon dioxide dosing device to obtain desalinated water containing dissolved carbon dioxide; S2: Desalinated seawater containing dissolved carbon dioxide passes through the quartz sand filling layer and the natural mineral material filling layer of the conditioning filter in turn, and is filtered and tempered to obtain drinking water that meets drinking standards.

10. The method for conditioning desalinated water according to claim 9, characterized in that: In step S1, carbon dioxide is added to the desalinated water from the desalinated water bypass pipeline by a carbon dioxide adding device to obtain desalinated water containing dissolved carbon dioxide; In step S2, desalinated water containing dissolved carbon dioxide enters the desalinated water main pipeline, and then passes through the quartz sand filling layer and the natural mineral material filling layer of the conditioning filter in sequence, and is filtered and tempered to obtain drinking water that meets drinking standards.

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