A geothermal water purification treatment method and device based on cation and anion adsorption precipitation

Abstract

This invention provides a method and apparatus for geothermal water purification based on anion and cation adsorption and precipitation, belonging to the field of geothermal water treatment technology. It includes a first filter tank and a second filter tank connected in sequence. The first outlet of the first filter tank is connected to the second inlet of the second filter tank. The first filter tank includes a manganese sand layer and an iron-based anion exchange resin layer filled from top to bottom. The second filter tank includes a zeolite layer, an activated bauxite layer, and an activated carbon layer filled from top to bottom. Geothermal water flows through the first and second filter tanks in the direction of water flow, enabling the geothermal water discharge to meet or exceed the Class III standard of GB8978 "Integrated Wastewater Discharge Standard".

Description

Technical Field

[0001] This invention relates to the field of geothermal water treatment technology, specifically to a geothermal water purification method and apparatus based on anion and cation adsorption and precipitation. Background Technology

[0002] Geothermal water resources, as a clean, environmentally friendly, energy-saving, and renewable new energy source, are receiving increasing attention for their development and utilization. Compared with traditional energy sources, geothermal water resources have the advantages of relatively continuous and stable energy supply, efficient recycling, renewability, and low operating costs, and can be used for various purposes such as power generation, heating, bathing, aquaculture, and healthcare. To a certain extent, geothermal energy is expected to become an important direction for future energy development. However, in geothermal well water supply projects, the water returned from the geothermal wells may contain scale particles, be colored or odorous, and have excessive levels of pollutants. Direct discharge of such water could have a certain impact on urban sewage treatment systems or the surface environment, which does not meet the requirements for high-quality green development of the industry.

[0003] Current research on geothermal water treatment is limited, and existing methods and materials generally only address specific harmful components in the water, with solutions often prepared in the laboratory. Various treatment technologies, including precipitation, ion exchange, membrane technology, adsorption, and electrodialysis, are used to remove fluoride from geothermal water. Pascua et al. used Swartman iron ore to treat arsenic in geothermal water; Kabay et al., Koseoglu et al., Ipek et al., and Samatya et al. conducted experimental studies on boron removal from geothermal water using electrocoagulation, a hybrid ion exchange-microfiltration process, membrane technology, or boron-selective ion exchange resins and monodisperse porous synthetic resins, respectively. The geothermal water treatment technologies used in these studies are generally expensive or complex, and cannot reduce the content of the component to below water quality standards in a single step, making them unsuitable for preventing environmental pollution caused by harmful components from geothermal sources. In geothermal areas and surrounding regions with low economic development levels, large-scale geothermal water treatment plants or systems with high operating and maintenance costs are difficult to promote.

[0004] Moreover, geothermal water is rich in Fe 2+ During the processes of geothermal water extraction, geothermal heat exchange, and geothermal water reinjection, Fe 2 + Oxidized to Fe 3+ This forms a yellow or brown precipitate, resulting in scaling on the inner walls of wells and pipes, and within the area affected by reinjection. Therefore, it is evident that Fe... 2+ However, it becomes a pollutant. Therefore, efficient removal of Fe from geothermal water is crucial. 2+ At the same time, ensuring that the discharge of geothermal water meets the standards is an urgent problem to be solved in the development and utilization of geothermal energy. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings of the prior art by providing a geothermal water purification method and apparatus based on anion and cation adsorption and precipitation. This method can reduce the pollutant content in geothermal water to below the water quality standard in one step, thus meeting the discharge standard. Its application prospects in the field of geothermal water treatment are extremely promising.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first objective of this invention is to provide a geothermal water purification method based on anion and cation adsorption and precipitation. The method employs a geothermal water purification device comprising a first filter tank and a second filter tank connected in sequence. The first filter tank has a first inlet at the top and a first outlet at the bottom. The second filter tank has a second inlet at the top and a second outlet at the bottom. The first outlet is connected to the second inlet. The first filter tank comprises a manganese sand layer and an iron-based anion exchange resin layer filled from top to bottom. The second filter tank comprises a zeolite layer, an activated bauxite layer, and an activated carbon layer filled from top to bottom. The geothermal water flows through the first and second filter tanks in the direction of water flow, enabling the geothermal water discharge to meet or exceed the Class III standard of GB8978 "Integrated Wastewater Discharge Standard".

[0008] Furthermore, the manganese sand in the manganese sand layer has a particle size of 0.1mm~1mm and the iron-based anion exchange resin layer has a particle size of 50 mesh~150 mesh; the laying height ratio of the manganese sand layer to the iron-based anion exchange resin layer is (1~2):1, fixed according to the cross-sectional area of ​​the first filter tank.

[0009] Furthermore, the zeolite in the zeolite layer has a particle size of 0.5 mm to 3 mm, the bauxite in the activated bauxite layer has a particle size of 1 mm to 5 mm, and the activated carbon in the activated carbon layer has a particle size of 10 mesh to 80 mesh.

[0010] Furthermore, based on the fixed cross-sectional area of ​​the second filter tank, the laying height ratio of the zeolite layer, the activated bauxite layer, and the activated carbon layer is (1~1.2):(1~1.2):(1~1.2).

[0011] Furthermore, the flow velocity of the geothermal water into the first filter tank is 45~50 m. 3 / h.

[0012] Furthermore, the geothermal water purification treatment method removes ferrous ions from geothermal water at a rate of at least 99.9%.

[0013] Furthermore, the geothermal water is return water from sandstone or limestone geothermal water supply wells.

[0014] Furthermore, grids are provided between the manganese sand layer and the iron-based anion exchange resin layer, between the zeolite layer and the activated bauxite layer, and between the activated bauxite layer and the activated carbon layer.

[0015] Furthermore, a second objective of this invention is to provide a geothermal water purification device that operates using the aforementioned treatment method. The geothermal water purification device includes a vertical multi-stage booster pump, a first filter tank, a second filter tank, a precision filter, a rotor flow meter, and a pipeline ultraviolet disinfection lamp, all connected in sequence. The vertical multi-stage booster pump, the first filter tank, and the second filter tank are connected sequentially along the water flow direction. A pipeline ball valve is provided between the inlet and the vertical multi-stage booster pump to control the entry of geothermal water. A high-pressure protection switch, a conductivity sensor A, a rotor flow meter, and a pointer pressure gauge are provided between the vertical multi-stage booster pump and the second filter tank. Both the first and second filter tanks have automatic filter valves at their tops to flush the filter media. A pressure relief valve with a pointer pressure gauge is connected above the precision filter, and the rotor flow meter is connected to its left end. The front end of the pipeline ultraviolet disinfection lamp is connected to a conductivity sensor B, and the rear end is connected to the equipment outlet. The geothermal water purification device also includes an industrial process electrical control box that can monitor the real-time operating status of the geothermal water treatment equipment.

[0016] Compared with the prior art, the beneficial effects of the technical solution provided by the present invention are as follows:

[0017] (1) The present invention provides a geothermal water purification method based on anion and cation adsorption and precipitation, comprising a first filter tank and a second filter tank connected in sequence. The first outlet of the first filter tank is connected to the second inlet of the second filter tank. The first filter tank includes a manganese sand layer and an iron-based anion exchange resin layer filled from top to bottom. The second filter tank includes a zeolite layer, an activated bauxite layer and an activated carbon layer filled from top to bottom. The geothermal water flows through the first filter tank and the second filter tank in the direction of water flow. The manganese sand layer can reduce hydrodynamic force, construct a microporous network, block suspended solids and some suspended colloids, and continuously fall from the pores. At the same time, the manganese sand also has the catalytic oxidation of Fe. 2+ The effect of promoting Fe 2+ Precipitation occurs; the iron-based anion exchange resin layer can remove ions such as fluorine, tungsten, antimony, and boron from geothermal water, reducing the content of pollutants and the salinity of the geothermal water. Simultaneously, it can reduce the Fe content in the geothermal water. 2+ Partial oxidation forms flocs; the zeolite layer adsorbs and removes iron and manganese ions, as well as their flocs, from geothermal water; the activated bauxite layer further reduces the Fe and Mn content in the geothermal water and removes F. - HS - The activated carbon layer removes and purifies residual suspended solids, colloids, flocculants, color, and odor. After passing through this five-layer filter, the Fe in the geothermal water... 2+Ions that easily form precipitates and scale are significantly removed, and the content of some polluting elements is significantly reduced, enabling the discharge of geothermal water to meet or exceed the Class III standard in GB8978 "Integrated Wastewater Discharge Standard".

[0018] (2) The geothermal water purification device provided by the present invention has a simple structure, is easy to operate, has low cost, is made from widely available materials, is small and easy to transport, and has good operability.

[0019] (3) The geothermal water purification device provided by the present invention can reduce the content of the components to be treated to below the water quality standard in one go. The removal rates of iron ions and manganese ions can reach 99.95% and 96.30%, respectively, and the removal rate of chloride ions can reach 92.89%. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a geothermal water purification device provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the filter structure provided by the present invention;

[0022] Figure 3 This is a structural diagram of the field operation device provided by the present invention.

[0023] In the diagram: 1. Geothermal water treatment device; 2. Vertical multi-stage booster pump; 3. Automatic filter valve; 4. First filter tank; 41. First inlet; 42. First outlet; 43. Manganese sand layer; 44. Iron-based anion exchange resin layer; 5. Second filter tank; 51. Second inlet; 52. Second outlet; 53. Zeolite layer; 54. Activated bauxite layer; 55. Activated carbon layer; 6. Precision filter; 7. High-pressure protection switch; 8. Rotor flow meter; 9. Conductivity sensor A; 10. Pipeline ball valve; 11. Pressure relief valve; 12. Rotor flow meter; 13. Conductivity sensor B; 14. Pointer pressure gauge; 15. Pipeline ultraviolet disinfection lamp; 16. Equipment outlet; 17. Industrial process electrical control box; 18. Grille. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the specific embodiments and accompanying drawings are described in further detail below. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0025] refer to Figure 1A geothermal water purification device 1 based on anion and cation adsorption and precipitation includes: a vertical multi-stage booster pump 2, a first filter tank 4, a second filter tank 5, a precision filter 6, a rotor flow meter 12, a pipeline ultraviolet disinfection lamp 15, and an industrial process electrical control box 17, which are connected end to end in sequence. A vertical multistage booster pump 2, a first filter tank 4, and a second filter tank 5 are connected in sequence. A ball valve 10 is installed between the inlet and the vertical multistage booster pump 2 to control the entry of geothermal water. A high-pressure protection switch 7, a conductivity sensor A9, a rotor flow meter 8, and a pointer pressure gauge 14 are installed between the vertical multistage booster pump 2 and the second filter tank 5. The first filter tank 4 and the second filter tank 5 are filled with an appropriate amount of filter media according to the corresponding ratio, and each is equipped with an automatic filter valve 3 to flush the filter media. A pressure relief valve 11 with a pointer pressure gauge is connected to the top of the precision filter 6, and a rotor flow meter 12 is connected to the left end. A pipeline ultraviolet disinfection lamp 15 is connected to a conductivity sensor B13 at the front end and connected to the equipment outlet 16 at the rear end. In addition, there is an industrial process electrical control box 17 that can monitor the operation status of the geothermal water treatment equipment in real time.

[0026] refer to Figure 2 Geothermal water enters the first filter tank 4 under the action of the vertical multi-stage booster pump 2. The first filter tank 4 is filled from top to bottom with a manganese sand layer 43 and an iron-based anion exchange resin layer 44. Grilles 18 are installed between the manganese sand layer 43 and the iron-based anion exchange resin layer 44, and between the manganese sand layer 43 and the first inlet 41. The grilles 18 prevent the packing material from escaping. The pore size is 0.1~0.2mm. The manganese sand and iron-based anion exchange resin (Fe-LDH) replace fluorine, tungsten, antimony, and boron ions in the geothermal water. The manganese sand contains MnO2, which is converted into high-valence manganese under the action of dissolved oxygen in the water. The high-valence manganese then converts Fe... 2+ Oxidized to Fe 3+ Simultaneously, high-valence manganese compounds are reduced back to MnO2. As iron removal continues, a yellow film forms on the surface of the manganese sand. This film is formed after iron oxidation, and its main component is γ-FeOOH, which can absorb Fe from the water. 2+ Ion exchange occurs. The geothermal water discharged from the first outlet 42 of the first filter tank 4 then enters the second filter tank 5 through the second inlet 51. The second filter tank 5 is filled from top to bottom with a zeolite layer 53, an activated bauxite layer 54, and an activated carbon layer 55. Through oxidation-reduction reactions, the zeolite and activated bauxite react with Ba in the water... 2+ Pb 2+ Cd 2+ Cu 2+ Zn 2+ It reacts with heavy metal ions, fluoride ions, oils, and other organic substances. Activated carbon removes irritating H2S gas and other odorous and taste-producing substances from the water.

[0027] After the reaction, the geothermal water is further softened in the precision filter 6 to reduce the water's mineralization. Then, it is disinfected and sterilized by ultraviolet lamps in the pipeline. A portion of the water sample is collected from the device's outlet 16, and the anions and cations of the geothermal water can be analyzed using a Dionex ion chromatograph (model: ICS1100) and an inductively coupled plasma optical emission spectrometer (ICP-OES, model: ICAP6300).

[0028] The filter media used in this invention are: manganese sand: DFL-0203, iron-based anion exchange resin: 201×7(OH)717, zeolite: XF-801, activated bauxite: LA-γ-Al2O3, and activated carbon: N330, all of which are commercially available.

[0029] Example 1

[0030] The geothermal water treatment device provided by this invention was used to treat geothermal water in a certain area of ​​Xiong'an, Hebei Province. The geothermal water treatment device is referenced below. Figure 3 .

[0031] The geothermal water treatment unit has a processing flow rate of 50 m³ / h. 3 / h. The tank diameter is 1.2~1.5m, and the tank height is 1.2~1.6m. In the filtration structure, the first filter tank 4 is filled from top to bottom with a manganese sand layer and an iron-based anion exchange resin (Fe-LDH) layer. The second filter tank 5 is filled from top to bottom with a zeolite layer, an activated bauxite layer, and an activated carbon layer. The tank diameter is 1.2m, the manganese sand layer thickness is 0.5m (particle size 0.5mm), the iron-based anion exchange resin (Fe-LDH) thickness is 0.5m (particle size 100 mesh), the zeolite layer thickness is 0.5m (particle size 1mm), the activated bauxite layer thickness is 0.5m (particle size 3mm), and the activated carbon layer thickness is 0.5m (particle size 50 mesh).

[0032] Comparative Example: Basically the same as Example 1, except for the order in which the manganese sand layer, iron-based anion exchange resin layer, zeolite layer, activated bauxite layer, and activated carbon layer were laid, as follows:

[0033] Comparative Example 1: The first filter tank 4 is laid with an iron-based anion exchange resin layer and a zeolite layer from top to bottom; the second filter tank 5 is laid with an activated bauxite layer, a manganese sand layer and an activated carbon layer from top to bottom.

[0034] Comparative Example 2: The first filter tank 4 is laid with a zeolite layer and a manganese sand layer from top to bottom; the second filter tank 5 is laid with an iron-based anion exchange resin layer, an activated bauxite layer, and an activated carbon layer from top to bottom.

[0035] Comparative Example 3: The first filter tank 4 is laid with an activated bauxite layer and a manganese sand layer from top to bottom; the second filter tank 5 is laid with an iron-based anion exchange resin layer, a zeolite layer, and an activated carbon layer from top to bottom.

[0036] Comparative Example 4: The first filter tank 4 is laid with a manganese sand layer and a zeolite layer from top to bottom; the second filter tank 5 is laid with an iron-based anion exchange resin layer, an activated bauxite layer, and an activated carbon layer from top to bottom.

[0037] Comparative Example 5: The first filter tank 4 is laid with a manganese sand layer and a zeolite layer from top to bottom; the second filter tank 5 is laid with an activated bauxite layer, an iron-based anion exchange resin layer and an activated carbon layer from top to bottom.

[0038] Comparative Example 6: The first filter tank 4 is laid with a layer of manganese sand and a layer of activated bauxite from top to bottom; the second filter tank 5 is laid with a layer of iron-based anion exchange resin, a layer of zeolite, and a layer of activated carbon from top to bottom.

[0039] Comparative Example 7: The first filter tank 4 is laid with a layer of manganese sand and a layer of activated bauxite from top to bottom; the second filter tank 5 is laid with a layer of zeolite, a layer of iron-based anion exchange resin and a layer of activated carbon from top to bottom.

[0040] Water samples were collected from outlet 16 of the device, and the Fe content of the geothermal water was analyzed using a Dionex ion chromatograph (model: ICS1100) and an inductively coupled plasma optical emission spectrometer (ICP-OES, model: ICAP6300). 2+ Content, examining Fe 2+ The removal effect is shown in Table 1.

[0041] Table 1. Effects of adjusting the packing sequence on Fe 2+ Removal rate.

[0042]

[0043] Clearly, as shown in Table 1, the scheme of Example 1 is effective for Fe... 2+ It has the highest removal efficiency, reaching 99.9%.

[0044] To investigate the effect of filler particle size on Fe 2+ To mitigate the impact of removal efficiency, the particle size of each filler was adjusted based on Example 1. The specific adjustments to the manganese sand particle size are as follows:

[0045] Manganese sand 1: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the manganese sand particle size to 0.1 mm;

[0046] Manganese sand 2: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the manganese sand particle size to 0.2 mm;

[0047] Manganese sand 3: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the manganese sand particle size to 0.8 mm;

[0048] Manganese sand 4: Maintain the packing sequence, particle size and thickness of Example 1, only adjust the manganese sand particle size to 1.0 mm.

[0049] The results are shown in Table 2.

[0050] Table 2. Effect of manganese sand particle size on Fe 2+ The impact of removal rate.

[0051]

[0052] The specific steps for adjusting the particle size of iron-based anion exchange resin are as follows:

[0053] Anion exchange resin 1: Maintain the filler sequence, particle size, and thickness of Example 1, only adjust the iron-based anion exchange resin particle size to 150 mesh;

[0054] Anion exchange resin 2: Maintain the filler sequence, particle size, and thickness of Example 1, only adjust the iron-based anion exchange resin particle size to 120 mesh;

[0055] Anion exchange resin 3: Maintain the filler sequence, particle size, and thickness of Example 1, only adjust the iron-based anion exchange resin particle size to 80 mesh;

[0056] Anion exchange resin 4: Maintain the filler sequence, particle size, and thickness of Example 1, only adjust the iron-based anion exchange resin particle size to 50 mesh.

[0057] The results are shown in Table 3.

[0058] Table 3. Effect of iron-based anion exchange resin particle size on Fe 2+ The impact of removal rate.

[0059]

[0060] The specific steps for adjusting the zeolite particle size are as follows:

[0061] Zeolite 1: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the zeolite particle size to 0.5 mm;

[0062] Zeolite 2: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the zeolite particle size to 1.5 mm;

[0063] Zeolite 3: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the zeolite particle size to 2 mm;

[0064] Zeolite 4: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the zeolite particle size to 3 mm.

[0065] The results are shown in Table 4.

[0066] Table 4. Effect of zeolite particle size on Fe 2+ The impact of removal rate.

[0067]

[0068] The specific adjustments to the particle size of activated bauxite are as follows:

[0069] Activated bauxite 1: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the activated bauxite particle size to 1 mm;

[0070] Activated bauxite 2: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the activated bauxite particle size to 2 mm;

[0071] Activated bauxite 3: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the activated bauxite particle size to 4 mm;

[0072] Activated bauxite 4: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the activated bauxite particle size to 5 mm;

[0073] The results are shown in Table 5.

[0074] Table 5. Effect of activated bauxite particle size on Fe 2+ The impact of removal rate.

[0075]

[0076] The specific adjustments to the activated carbon particle size are as follows:

[0077] Activated carbon 1: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the activated carbon particle size to 80 mesh;

[0078] Activated carbon 2: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the activated carbon particle size to 60 mesh;

[0079] Activated carbon 3: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the activated carbon particle size to 20 mesh;

[0080] Activated carbon 4: Maintain the packing sequence, particle size, and thickness of Example 1, only adjust the activated carbon particle size to 10 mesh;

[0081] The results are shown in Table 6.

[0082] Table 6. Effect of activated carbon particle size on Fe 2+ The impact of removal rate.

[0083]

[0084] To better illustrate the effectiveness of the geothermal water purification method provided by this invention, the applicant has also conducted the following research:

[0085] Investigating the effect of packing volume on Fe 2+ The removal effect is affected.

[0086] The filter structure is basically the same as in Example 1, except that the thickness of the packing material is different, as detailed below:

[0087] Experimental Group 1: Manganese sand layer (1m), iron-based anion exchange resin layer (0.5m), zeolite layer (0.5m), activated bauxite layer (0.5m), activated carbon layer (0.5m);

[0088] Experimental Group 2: Manganese sand layer (0.5m), iron-based anion exchange resin layer (1m), zeolite layer (0.5m), activated bauxite layer (0.5m), activated carbon layer (0.5m);

[0089] Experimental Group 3: Manganese sand layer (1.2m), iron-based anion exchange resin layer (0.3m), zeolite layer (0.5m), activated bauxite layer (0.5m), activated carbon layer (0.5m);

[0090] Experimental Group 4: Manganese sand layer (0.3m), iron-based anion exchange resin layer (1.2m), zeolite layer (0.5m), activated bauxite layer (0.5m), activated carbon layer (0.5m);

[0091] Experimental group 5: manganese sand layer (1m), iron-based anion exchange resin layer (0.5m), zeolite layer (0.2m), activated bauxite layer (0.8m), activated carbon layer (0.5m);

[0092] Experimental Group 6: Manganese sand layer (0.5m), iron-based anion exchange resin layer (1m), zeolite layer (0.2m), activated bauxite layer (0.8m), activated carbon layer (0.5m);

[0093] Experimental Group 7: Manganese sand layer (1.2m), iron-based anion exchange resin layer (0.3m), zeolite layer (0.8m), activated bauxite layer (0.2m), activated carbon layer (0.5m);

[0094] Experimental Group 8: Manganese sand layer (0.3m), iron-based anion exchange resin layer (1.2m), zeolite layer (0.8m), activated bauxite layer (0.2m), activated carbon layer (0.5m).

[0095] The results are shown in Table 7.

[0096] Table 7. Effect of filler thickness on Fe 2+ The impact of removal rate.

[0097]

[0098] Clearly, as shown in Table 7, the scheme of experimental group 1 is effective for Fe. 2+ It has the highest removal efficiency, reaching 99.9%.

[0099] Using the filtration structure of Experimental Group 1, geothermal water samples were treated. The changes in the content of various elements in the geothermal water before and after treatment are shown in Table 8. Manganese sand and modified zeolite showed significant effects in removing iron and manganese ions, with removal rates of 99.95% and 96.30% for iron and manganese ions, respectively. The removal rate of chloride ions reached 92.89%, indicating that anion exchange resin has a good removal effect on chloride ions. Therefore, the geothermal water purification device based on anion and cation adsorption and precipitation with a detachable filter element can enable the discharge of geothermal water to meet or exceed the Class III standard in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

[0100] Table 8.

[0101]

[0102] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for purifying geothermal water based on anion and cation adsorption and precipitation, characterized in that, The geothermal water is treated using a geothermal water purification device (1), which includes a filtration structure, namely a first filter tank (4) and a second filter tank (5) connected in sequence. The first filter tank (4) has a first inlet (41) at the top and a first outlet (42) at the bottom. The second filter tank (5) has a second inlet (51) at the top and a second outlet (52) at the bottom. The first outlet (42) is connected to the second inlet (51). The first filter tank (4) includes a manganese sand layer (43) and an iron-based anion exchange resin layer (44) filled from top to bottom. The second filter tank (5) includes a zeolite layer (53), an activated bauxite layer (54), and an activated carbon layer (55) filled from top to bottom. The geothermal water flows through the first filter tank (4) and the second filter tank (5) in the direction of water flow, so that the discharge of geothermal water can reach the Class III standard or above in GB8978 "Integrated Wastewater Discharge Standard".

2. The geothermal water purification method as described in claim 1, characterized in that, The manganese sand in the manganese sand layer (43) has a particle size of 0.1 mm to 1 mm and the iron-based anion exchange resin layer (44) has a particle size of 50 mesh to 150 mesh; the laying height ratio of the manganese sand layer (43) to the iron-based anion exchange resin layer (44) is (1 to 2): 1, fixed according to the cross-sectional area of ​​the first filter tank (4).

3. The geothermal water purification method as described in claim 2, characterized in that, The zeolite in the zeolite layer (53) has a particle size of 0.5 mm to 3 mm, the bauxite in the activated bauxite layer (54) has a particle size of 1 mm to 5 mm, and the activated carbon in the activated carbon layer (55) has a particle size of 10 mesh to 80 mesh.

4. The geothermal water purification method as described in claim 3, characterized in that, The cross-sectional area of ​​the second filter tank (5) is fixed, and the laying height ratio of the zeolite layer (53), the activated bauxite layer (54) and the activated carbon layer (55) is (1~1.2):(1~1.2):(1~1.2).

5. The geothermal water purification method as described in claim 4, characterized in that, The flow velocity of the geothermal water into the first filter tank (4) is 45~50 m. 3 / h.

6. The geothermal water purification method as described in claim 5, characterized in that, The geothermal water purification treatment method removes ferrous ions from geothermal water at a rate of at least 99.9%.

7. The geothermal water purification method as described in claim 6, characterized in that, The geothermal water is return water from sandstone and limestone geothermal water supply wells.

8. The geothermal water purification method as described in claim 1, characterized in that, A grid (18) is provided between the manganese sand layer (43) and the iron-based anion exchange resin layer (44), between the zeolite layer (53) and the activated bauxite layer (54), and between the activated bauxite layer (54) and the activated carbon layer (55).

9. The geothermal water purification method as described in claim 8, characterized in that, The aperture size of the grille is 0.1-0.2 mm.

10. A geothermal water purification and treatment device, characterized in that, The geothermal water purification device (1) operates according to any one of claims 1-9, comprising a vertical multistage booster pump (2), a first filter tank (4), a second filter tank (5), a precision filter (6), a rotor flow meter (12), and a pipeline ultraviolet disinfection lamp (15) connected in sequence. The vertical multistage booster pump (2), the first filter tank (4), and the second filter tank (5) are connected in sequence along the water flow direction. A pipeline ball valve (10) is provided between the inlet and the vertical multistage booster pump (2) to control the entry of geothermal water. A pipeline ball valve (10) is provided between the vertical multistage booster pump (2) and the second filter tank (5). The device includes a high-pressure protection switch (7), a conductivity sensor A (9), a rotor flow meter (8), and a pointer pressure gauge (14); the first filter tank (4) and the second filter tank (5) are equipped with automatic filter valves (3) to flush the filter media; the precision filter (6) is connected to a pressure relief valve (11) with a pointer pressure gauge, and the left end is connected to a rotor flow meter (12); the pipeline ultraviolet disinfection lamp (15) is connected to a conductivity sensor B (13) at the front end and connected to the equipment outlet (16) at the rear end; the geothermal water purification treatment device (1) also includes an industrial process electrical control box (17) that can monitor the operation status of the geothermal water treatment equipment in real time.

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