Filler mineralization filter tank for stabilizing desalted water

Abstract

The utility model belongs to the technical field of seawater treatment, and particularly relates to a filler mineralization filter tank for stabilizing desalted water, which comprises a filter tank body, a buffer area, a dissolved gas area, a filter area and a water and gas distribution area are sequentially arranged in the filter tank body from top to bottom, and an exhaust port and a water inlet are sequentially arranged in the buffer area of the filter tank body from top to bottom. A water outlet is formed in the water and gas distribution area of the filter tank body, the filter area is sequentially provided with a mineral substance layer, a supporting layer, a filter plate and a plurality of long-handle filter heads from top to bottom, the long-handle filter heads are transversely arranged, and a water distribution grating connected with the filter tank body through angle iron is arranged between the gas dissolving area and the water inlet; through grid flow equalization and filler diffusion, the full contact reaction of desalted water and mineralized filter materials is ensured, and the device has the characteristics of equipping, movability, diversification and the like, and is better suitable for reverse osmosis membrane method municipal water supply systems of various scales.

Description

Technical Field

[0001] This utility model belongs to the field of seawater treatment technology, specifically relating to a packed mineralization filter tank for stabilizing desalinated water. Background Technology

[0002] my country faces a severe shortage of freshwater resources, particularly in its vast coastal areas and islands. Seawater desalination technology is an effective way to address the global freshwater crisis and has become a hot research topic for scientists worldwide. Desalinated water is soft water, with significantly lower total dissolved solids and hardness than tap water. If it enters the municipal water supply network directly without treatment, it can damage the network and even cause "red water" (water contamination), releasing heavy metal ions and polluting the water supply. To prevent such accidents, mineralization treatment is necessary before the desalinated water enters the municipal water supply network to increase its chemical stability.

[0003] Today, my country's seawater desalination industry has taken initial shape, but in the existing technology, most seawater is desalinated through mineralization treatment ponds, which are immovable and have long construction cycles. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a stable demineralized water packing mineralization filter tank to solve the problems mentioned in the background art.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A packing mineralization filter for stable desalination includes a filter tank body. The filter tank body has, from top to bottom, a buffer zone, a dissolved air zone, a filtration zone, and a water and air distribution zone. The buffer zone has, from top to bottom, an exhaust port and a water inlet. The water and air distribution zone has a water outlet. The filtration zone has, from top to bottom, a mineral layer, a support layer, a filter plate, and multiple long-handled filter heads arranged horizontally. The bottom of the filter tank body has a drain port. The dissolved air zone has a feed inlet. A water distribution grid, connected to the filter tank body via angle iron, is installed between the dissolved air zone and the water inlet.

[0007] Further specifying, the exhaust port is equipped with an exhaust pipe, and the exhaust pipe is equipped with a backwash drain pipe control valve.

[0008] Furthermore, the filter tank body has a first CO2 reflux port in the dissolved gas zone.

[0009] Further specified, the top of the filter canister body is detachably connected to the middle of the filter canister body, and a pressure relief safety valve is installed and connected to the upper side of the top of the filter canister body.

[0010] Further specified, the material of the support layer is quartz sand, the thickness of the support layer is 0.1-0.2m, and the effective particle size is 2-4mm.

[0011] Furthermore, the feed inlet is connected to a sealing cap, and the sealing cap is fixed to the feed inlet by bolts.

[0012] Further specifying, the water inlet is equipped with an air inlet pipe, a water inlet pipe, and a backwash wastewater drain pipe, and the air inlet pipe, water inlet pipe, and backwash wastewater drain pipe are respectively equipped with a CO2 air inlet pipe control valve, a water inlet control valve, and a backwash wastewater drain pipe control valve.

[0013] Further specifying, the water outlet is equipped with a water outlet pipe, a backwash air pipe, and a backwash water pipe, and the water outlet pipe, backwash air pipe, and backwash water pipe are respectively equipped with a water outlet pipe control valve, a backwash air pipe control valve, and a backwash water pipe control valve.

[0014] Further specifying, the buffer zone is provided with a second CO2 reflux port, and a CO2 reflux pipe is connected between the second CO2 reflux port and the first CO2 reflux port. The CO2 reflux pipe is connected to a water jet injector, and the water jet injector is equipped with a power water pipe.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This utility model ensures full contact and reaction between desalinated water and mineralized filter media through grid flow equalization and packing diffusion. At the same time, it integrates and equips conventional civil engineering mineralized filter tanks, which can not only reduce civil engineering investment and shorten the construction period, but also has the characteristics of equipment, mobility and versatility, making it more suitable for municipal water supply systems of various scales using reverse osmosis membranes.

[0017] 2. This utility model has a wide range of applications, including mineralization of desalinated water in small and medium-sized seawater desalination plants and municipal water supply plants, as well as direct drinking water systems in public buildings.

[0018] 3. The design parameters of the mineralization filter tank basically meet the mineralization requirements of demineralized water, and it can operate stably with good results.

[0019] 4. Compared with civil engineering filter tanks, the use of storage tanks has advantages in terms of reducing land area, reducing civil engineering investment, and shortening construction period.

[0020] 5. Equipped with an air-water flushing system, which can perform single air flushing or single water flushing according to the operating conditions, thereby achieving functions such as flushing the filter media and preventing filter media caking. Attached Figure Description

[0021] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0022] Figure 1 This is a schematic diagram of the structure of a packing mineralization filter tank for stabilizing demineralized water according to the present invention;

[0023] Figure 2 This is a cross-sectional structural diagram of the filter area of ​​this utility model;

[0024] Figure 3 This is a schematic diagram of the component structure of this utility model connected to the water inlet;

[0025] Figure 4 This is a schematic diagram of the component structure of this utility model connected to the water outlet;

[0026] Figure 5 This is a schematic diagram of the component structure of this utility model connected to the second CO2 reflux port 23;

[0027] The symbols for the main components are explained below:

[0028] Filter tank body 1;

[0029] Buffer zone 2, exhaust port 21, exhaust pipe 211, backwash drain pipe control valve 213, water inlet 22, air inlet pipe 221, water inlet pipe 222, backwash waste drain pipe 223, CO2 air inlet pipe control valve 224, water inlet control valve 225, backwash waste water pipe control valve 226, second CO2 return port 23, CO2 return pipe 231, water jet injector 232, power water pipe 233;

[0030] Dissolved gas zone 3, feed inlet 31, first CO2 reflux port 32, sealing cap 33;

[0031] Filtration zone 4, mineral layer 41, support layer 42, filter plate 43, long-handled filter head 44;

[0032] Water and air distribution area 5, water outlet 51, water outlet pipe 511, backwash air pipe 512, backwash water pipe 513, water outlet pipe control valve 514, backwash air pipe control valve 515, backwash water pipe control valve 516;

[0033] 6. Sewage outlet; 7. Water distribution grid; 8. Pressure relief safety valve. Detailed Implementation

[0034] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] like Figure 1-5As shown, a packing mineralization filter for stable desalination includes a filter body 1. Inside the filter body 1, from top to bottom, there are a buffer zone 2, a dissolved air zone 3, a filtration zone 4, and a water and air distribution zone 5. The buffer zone 2 of the filter body 1 has an exhaust port 21 and a water inlet 22 from top to bottom. The water and air distribution zone 5 of the filter body 1 has a water outlet 51. The filtration zone 4 has a mineral layer 41, a support layer 42, a filter plate 43, and a long-handled filter head 44 from top to bottom. There are multiple long-handled filter heads 44 arranged horizontally. The bottom of the filter body 1 has a drain port 6. The dissolved air zone 3 of the filter body 1 has a feed inlet 31. A water distribution grid 7 connected to the filter body 1 by angle iron is provided between the dissolved air zone 3 and the water inlet 22.

[0036] In this embodiment, the filter tank body is made of 316L stainless steel. Furthermore, the filter tank body 1 can be composed of multiple tanks for combined use, thus achieving compartmentalized operation of the mineralization process. The seawater to be treated enters the filter tank body 1 through the inlet 22. The seawater passes through the water distribution grid 7, which removes impurities from the seawater, thus filtering it. Simultaneously, the water flow from the inlet 22 is dispersed, and then the water reaches the dissolved air zone 3, which is filled with carbon dioxide gas, allowing the water and carbon dioxide to mix thoroughly. The main principle of mineralization is as follows: Because most ions in the desalinated water are removed, it contains virtually no minerals, resulting in a significant reduction in alkalinity and hardness, extremely poor water stability, and strong corrosiveness to water supply pipelines. Therefore, it is necessary to increase the hardness and alkalinity of the desalinated water to stabilize the water. This process is called mineralization. The mineralization process in this invention mainly uses limestone, natural shells, and other materials with CaCO3 and MgCO3 as the main components as filter media. Simultaneously, because the dissolved air zone 3 is filled with CO2... 2， The following reaction occurs in the water:

[0037] CaCO3 + 2CO2 + H2O = Ca(HCO3)2 - )2

[0038] MgCO3 + 2CO2 + H2O = Mg(HCO3) - )2

[0039] This process requires a small amount of CO2 and can achieve Ca 2+ Mg 2+ and CO3 2-The dissolution of plasma increases the alkalinity and hardness of the desalinated water, thus stabilizing the desalinated water. After passing through the dissolved air zone 3, the water then reaches the filtration zone 4, sequentially passing through the mineral layer 41, the support layer 42, the filter plate 43, and the long-handled filter head 44. The filter media of the mineral layer 41 is one of natural seashells, limestone, dolomite, or a combination of multiple filter media with similar physical properties. Specifically, the main components of the mineral layer should be calcium carbonate, magnesium carbonate, etc., and the non-carbonate components are insoluble in water. The thickness of the mineral layer is 2.0-2.7 μm, the particle size of the filter media is 4-6 mm, and the filtration rate should be determined by calculation. The filtration rate should ensure that the expansion rate of the filter media is not less than 10%, and the backwashing rate should maintain the expansion rate of the filter media at 30%. The support layer 42 mainly serves a supporting function, and the filter plate 43 is used for the water body... Filtration is performed, with filter plate 43 preferably made of 316L stainless steel. The water filtered by filter plate 43 then reaches long-handled filter head 44. The drain port 6 is used to open the valve connected to the drain port 6 after rinsing the filter tank body 1, draining the wastewater in the filter tank body. The inlet of dissolved air zone 3 is used to put bagged limestone or shell filter media. The filter zone 4 and its lower part of the filter tank body 1 are detachable, allowing the filter media in the filter zone 4 to be replaced. The filter tank body 1 is also connected to a backwashing component and a carbon dioxide air intake component to realize the introduction of carbon dioxide gas and the rinsing of the filter tank body 1. At the same time, CO2 is added to the inlet water of the filter tank body 1, and the amount of CO2 added should be adjusted according to the pH, alkalinity, and hardness of the effluent, so that the desalinated water undergoes the following chemical reactions during the residence time of the filter media layer:

[0040] CaCO3 + 2CO2 + H2O = Ca(HCO3)2 - )2.

[0041] Reference Figure 1 The exhaust port 21 is connected to an exhaust pipe 211, and the exhaust pipe 211 is connected to a backwash drain pipe control valve 213. In this embodiment, the backwash drain pipe control valve 213 is used to control the gas discharge.

[0042] Reference Figure 1 The filter tank body 1 has a first CO2 reflux port 32 in the dissolved gas zone 3.

[0043] Reference Figure 1 The top of the filter tank body 1 is detachably connected to the middle of the filter tank body 1, and a pressure relief safety valve 8 is installed on the upper side of the top of the filter tank body 1. In this embodiment, the pressure relief safety valve 8 is used to adjust the internal pressure of the filter tank body 1 to ensure safety.

[0044] The support layer 42 is made of quartz sand, with a thickness of 0.1-0.2 μm and an effective particle size of 2-4 mm. In this embodiment, the support layer 42 is further defined, preferably with a thickness of 0.1 to 0.2 μm.

[0045] Reference Figure 1 The feed inlet 31 is connected to a sealing cover 33, which is fixed to the feed inlet 31 by bolts. In this embodiment, the sealing cover 33 seals the feed inlet 31. When feeding is required, the sealing cover 33 can be opened. Preferably, the sealing cover 33 is connected to the filter tank body 1 by a flange.

[0046] Reference Figure 3 The inlet 22 is equipped with an air inlet pipe 221, a water inlet pipe 222, and a backwash wastewater drain pipe 223. The air inlet pipe 221, water inlet pipe 222, and backwash wastewater drain pipe 223 are respectively equipped with a CO2 air inlet control valve 224, a water inlet control valve 225, and a backwash wastewater drain pipe control valve 226. In this embodiment, the air inlet pipe 221, water inlet pipe 222, and backwash wastewater drain pipe 223 are installed at one inlet 22. The discharge of gas and wastewater is controlled by controlling the CO2 air inlet control valve 224, the water inlet control valve 225, and the backwash wastewater drain pipe control valve 226.

[0047] Reference Figure 4 The outlet 51 is equipped with an outlet pipe 511, a backwash air pipe 512, and a backwash water pipe 513. The outlet pipe 511, backwash air pipe 512, and backwash water pipe 513 are respectively equipped with an outlet pipe control valve 514, a backwash air pipe control valve 515, and a backwash water pipe control valve 516. In this embodiment, the backwash water pipe 513 cooperates with the backwash waste drain pipe 223. Water entering from the backwash water pipe 513 is discharged from the backwash waste drain pipe 223, and gas 512 enters the filter tank body 1 from the backwash air pipe 512 and then exits from the exhaust pipe 211. The air flushing and water flushing structure is to prevent residue in the filter media from affecting the turbidity of the effluent during the initial addition of filter media and to prevent the filter media from caking due to prolonged shutdown of the filter tank.

[0048] Reference Figure 5 Buffer zone 2 is equipped with a second CO2 reflux port 23. A CO2 reflux pipe 231 connects the second CO2 reflux port 23 to the first CO2 reflux port 32. The CO2 reflux pipe 231 is connected to a water jet injector 232, and the water jet injector 232 is equipped with a power water pipe 233. In this embodiment, the CO2 reflux pipe 231 connects the second CO2 reflux port 23 to the first CO2 reflux port 32, allowing for the reuse of incompletely reacted carbon dioxide gas, reducing reagent consumption, and recovering the gas discharged from the second CO2 reflux port 23 back into the dissolved gas zone.

[0049] The flushing operation process is as follows: Close the inlet water pipe control valve 225, CO2 inlet air pipe control valve 224, outlet water pipe control valve 514, backwash water pipe control valve 516, sewage pipe control valve, and backwash wastewater pipe control valve 226. Open the backwash air pipe control valve 515. Gas enters the water and air distribution area through the backwash air pipe 512 and the inlet water port 22. The water flushing port and air flushing port are located in the same position as the inlet water port 22. The mineral layer 41 is flushed through the long-handled filter head 44 and the support layer 42. The air flushing intensity is 60 m3 / m2·h, and the air flushing time is 2 minutes. After the air flushing is completed, close the backwash air pipe control valve 515 and open the backwash air pipe control valve 515. The backwash water pipe control valve 516 and the backwash wastewater pipe control valve 226 are used to control the backwash water. The backwash water enters the water and air distribution area 5 from the backwash water pipe 513 and the inlet 22 (i.e., the water flushing and air flushing port). It flushes the mineral layer 41 through the long-handled filter head 44 and the support layer 42. The water flushing intensity is 25 m3 / m2·h and the water flushing time is 6 minutes. The flushed wastewater is discharged through the outlet 51 and the backwash wastewater pipe 223. Finally, the backwash water pipe control valve 516 and the backwash wastewater pipe control valve are closed, and the drain pipe control valve is opened to discharge the residual water in the tank. After the water is discharged, the drain outlet 6 control valve is closed, and the backwashing operation ends.

[0050] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0051] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A packed mineralization filter for stabilizing desalinated water, comprising a filter body (1), characterized in that: The filter tank body (1) is provided with a buffer zone (2), a dissolved air zone (3), a filtration zone (4) and a water and air distribution zone (5) from top to bottom. The buffer zone (2) of the filter tank body (1) is provided with an exhaust port (21) and a water inlet (22) from top to bottom. The water and air distribution zone (5) of the filter tank body (1) is provided with a water outlet (51). The filtration zone (4) is provided with a mineral layer (41), a support layer (42), a filter plate (43) and a long-handled filter head (44) from top to bottom. There are multiple long-handled filter heads (44) arranged horizontally. The bottom of the filter tank body (1) is provided with a drain port (6). The dissolved air zone (3) of the filter tank body (1) is provided with a feed inlet (31). A water distribution grid (7) connected to the filter tank body (1) by angle iron is provided between the dissolved air zone (3) and the water inlet (22).

2. The packed mineralization filter tank for stabilizing demineralized water according to claim 1, characterized in that: The exhaust port (21) is equipped with an exhaust pipe (211), and the exhaust pipe (211) is equipped with a backwash drain pipe control valve (213).

3. The packed mineralization filter tank for stabilizing demineralized water according to claim 2, characterized in that: The filter body (1) has a first CO2 reflux port (32) in the dissolved gas zone (3).

4. The packed mineralization filter tank for stabilizing demineralized water according to claim 3, characterized in that: The top of the filter tank body (1) is detachably connected to the middle part of the filter tank body (1), and a pressure relief safety valve (8) is installed on the upper side of the top of the filter tank body (1).

5. The packed mineralization filter tank for stabilizing demineralized water according to claim 3, characterized in that: The material of the support layer (42) is quartz sand, the thickness of the support layer (42) is 0.1-0.2m, and the effective particle size is 2-4mm.

6. The packed mineralization filter tank for stabilizing demineralized water according to claim 3, characterized in that: The feed inlet (31) is connected to a sealing cover (33), and the sealing cover (33) is fixed to the feed inlet (31) by bolts.

7. The packed mineralization filter tank for stabilizing demineralized water according to claim 3, characterized in that: The inlet (22) is equipped with an air inlet pipe (221), a water inlet pipe (222), and a backwash waste drain pipe (223). The air inlet pipe (221), the water inlet pipe (222), and the backwash waste drain pipe (223) are respectively equipped with a CO2 air inlet pipe control valve (224), a water inlet control valve (225), and a backwash waste water pipe control valve (226).

8. The packed mineralization filter tank for stabilizing demineralized water according to claim 3, characterized in that: The outlet (51) is equipped with an outlet pipe (511), a backwash air pipe (512), and a backwash water pipe (513). The outlet pipe (511), the backwash air pipe (512), and the backwash water pipe (513) are respectively equipped with an outlet pipe control valve (514), a backwash air pipe control valve (515), and a backwash water pipe control valve (516).

9. The packed mineralization filter for stable demineralized water according to any one of claims 1-8, characterized in that: The buffer zone (2) is provided with a second CO2 return port (23), and a CO2 return pipe (231) is connected between the second CO2 return port (23) and the first CO2 return port (32). The CO2 return pipe (231) is connected to a water jet (232), and the water jet (232) is equipped with a power water pipe (233).

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