Method and equipment for deep purification of qingshan spring water based on biomimetic rock stratum filtration

Abstract

The application relates to the field of water treatment and discloses a Qingshan spring water deep purification method and equipment based on bionic rock stratum filtration. After stable flow, air exhaust and primary interception are performed on Qingshan spring source water, turbidity, a pH value, conductivity, a redox potential, a dissolved oxygen content, an iron content, a manganese content and a total organic carbon content are obtained; the source water to be purified sequentially passes through a coarse-grained fissure percolation section, a micro-fissure adsorption section, an iron-manganese catalytic purification section and an organic matter buffer purification section, and main purified water is obtained; the micro-aeration intensity is adjusted according to the iron content, the manganese content and the dissolved oxygen content, and the proportion of the mineral buffer path is adjusted according to the conductivity and the pH value of the main purified water; after the mineral buffer water is mixed with bypass main purified water, the mixed water is subjected to membrane filtration and ultraviolet sterilization, and deep-purified mountain spring water is obtained. The application can adapt to Qingshan spring water quality fluctuation, and can improve the coordination of graded purification, mineral buffer and filter layer operation recovery.

Description

Technical Field

[0001] This invention relates to the field of water treatment, specifically to a method and equipment for deep purification of spring water in Qingshan based on biomimetic rock strata filtration. Background Technology

[0002] Mountain spring water usually originates from mountain fissures, shallow aquifers, or converging springs. As the water flows through the rock strata, it carries certain mineral components. It may also be affected by factors such as rainfall erosion, reduced water supply during the dry season, and changes in the water intake layer, resulting in fluctuations in turbidity, iron and manganese content, dissolved oxygen content, conductivity, and organic matter load.

[0003] Current spring water purification processes often employ a series of treatment units, including sand filtration, activated carbon filtration, iron-manganese filtration, membrane filtration, ultraviolet sterilization, or mineral filter media mineralization. These methods typically follow a fixed water flow path, and mineral filter media often operate by allowing all water to pass through or by supplementing mineralization at the end of the process.

[0004] However, when the quality of the source water fluctuates with the seasons and water intake conditions, the fixed series purification path is difficult to adapt to changes in the content of particulate matter, iron and manganese and mineral ions in the source water in a timely manner: when the turbidity of the source water increases, the fine pore filter layer is prone to premature clogging; when the iron and manganese content increases or the dissolved oxygen is insufficient, the iron and manganese purification conditions are unstable; when the conductivity of the main purified water changes, the fixed flow of all water through the mineral filter media is prone to insufficient or excessive release of minerals, which in turn affects the stability of the deep purification process of spring water. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method and equipment for deep purification of spring water in Qingshan based on biomimetic rock layer filtration, so as to solve the technical problems existing in the prior art.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: The deep purification method for spring water in Qingshan based on biomimetic rock strata filtration includes the following steps: S1: The collected spring water is subjected to flow stabilization treatment, air venting treatment and primary interception treatment to obtain the source water to be purified; S2: Perform online testing on the source water to be purified to obtain the turbidity, pH value, conductivity, oxidation-reduction potential, dissolved oxygen content, iron content, manganese content and total organic carbon content of the source water to be purified; S3: The source water to be purified enters the biomimetic rock stratum infiltration path and passes through the coarse-grained fissure infiltration section, the micro-fissure adsorption section, the iron-manganese catalytic purification section and the organic matter buffer purification section in sequence along the water flow direction to obtain the main purified water; S4: Control the micro-aeration intensity on the inlet side of the iron-manganese catalytic purification section based on the iron content, manganese content, and dissolved oxygen content. S5: Based on the conductivity and pH value of the main purified water, control the proportion of the main purified water entering the mineral buffer path; when the main purified water enters the mineral buffer path, make the main purified water entering the mineral buffer path pass through the carbonate mineral buffer section and the silicate mineral buffer section in sequence to obtain mineral buffer water. S6: Mix the mineral buffer water with the main purified water that did not enter the mineral buffer path to obtain mixed purified water; S7: Membrane filtration and ultraviolet sterilization are performed on the recycled purified water to obtain deeply purified spring water; Specifically, the operating pressure difference between the inlet and outlet sides of the coarse-grained fissure infiltration section, the micro-fissure adsorption section, and the iron-manganese catalytic purification section are obtained respectively, and the biomimetic rock stratum infiltration path is controlled by pulse loosening or backwashing according to the preset pressure difference control rules.

[0007] Preferably, the collected Qingshan Spring water undergoes flow stabilization treatment, venting treatment, and primary interception treatment, including: The collected spring water is introduced into the source water buffer chamber and left to stand in the source water buffer chamber for 3 to 10 minutes. During the retention of the spring water in Qingshan, the gas accumulated in the upper part of the spring water buffer chamber is discharged. After the exhaust gas is released, the source water from Qingshan Spring passes through a primary interceptor with a pore size of 80μm to 200μm to obtain the source water to be purified.

[0008] Preferably, when conducting online testing of the source water to be purified, the turbidity, pH value, conductivity, oxidation-reduction potential, dissolved oxygen content, iron content, manganese content and total organic carbon content of the source water to be purified are obtained in the same sampling cycle of 30s to 300s, and the water quality parameters obtained in the same sampling cycle are used as a set of water quality data.

[0009] Preferably, when the source water to be purified passes through the biomimetic rock stratum infiltration path, the apparent flow rate through the coarse-grained fissure infiltration section is 4 m / h to 8 m / h, the apparent flow rate through the micro-fissure adsorption section is 2 m / h to 5 m / h, the apparent flow rate through the iron-manganese catalytic purification section is 2 m / h to 4 m / h, and the apparent flow rate through the organic matter buffer purification section is 3 m / h to 6 m / h.

[0010] Preferably, the coarse-grained fissure infiltration section includes a first inorganic particle layer and a second inorganic particle layer arranged sequentially along the water flow direction, wherein the particle size of the first inorganic particle layer is 3 mm to 8 mm and the particle size of the second inorganic particle layer is 1 mm to 3 mm. The microcrack adsorption section includes a porous ceramic particle layer and a zeolite particle layer arranged sequentially along the water flow direction. The iron-manganese catalytic purification section includes a layer of manganese sand particles; The organic matter buffer purification section includes a granular activated carbon layer.

[0011] Preferably, controlling the micro-aeration intensity on the inlet side of the iron-manganese catalytic purification section according to the iron content, manganese content, and dissolved oxygen content includes: When the iron content is greater than 0.3 mg / L, or the manganese content is greater than 0.1 mg / L, or the dissolved oxygen content is less than 5 mg / L, micro-aeration is carried out on the inlet side of the iron-manganese catalytic purification section, and the air-water volume ratio of micro-aeration is controlled to be 0.02:1 to 0.12:1. When the iron content is no more than 0.3 mg / L, the manganese content is no more than 0.1 mg / L, and the dissolved oxygen content is no less than 5 mg / L, stop micro-aeration.

[0012] Preferably, controlling the proportion of the main purified water entering the mineral buffer path based on the conductivity and pH value of the main purified water includes: When the conductivity of the main purified water is less than 120 μS / cm and the pH value is between 6.5 and 8.5, the main purified water entering the mineral buffer path should account for 15% to 35% of the total flow rate of the main purified water. When the conductivity of the main purified water is between 120 μS / cm and 350 μS / cm, and the pH value is between 6.5 and 8.5, the main purified water entering the mineral buffer path should account for 5% to 20% of the total flow rate of the main purified water. When the conductivity of the main purified water is greater than 350 μS / cm, or the pH value is less than 6.5, or the pH value is greater than 8.5, the amount of main purified water entering the mineral buffer path shall be controlled to be 0% to 5% of the total flow rate of the main purified water.

[0013] Preferably, the residence time of the main purified water entering the mineral buffer path in the carbonate mineral buffer section is 2 to 8 minutes, and the residence time in the silicate mineral buffer section is 3 to 12 minutes. When the mineral buffer water is mixed with the main purified water that does not enter the mineral buffer path, the mineral buffer water and the main purified water that does not enter the mineral buffer path pass through the first turbulence zone and the second turbulence zone in sequence. The water flow direction of the first turbulence zone and the water flow direction of the second turbulence zone are misaligned in the direction of the water flow cross section.

[0014] Preferably, the membrane filtration and ultraviolet sterilization of the recycled purified water includes: passing the recycled purified water through an ultrafiltration membrane with a pore size of 0.02μm to 0.1μm, and then through an ultraviolet sterilization zone, wherein the ultraviolet wavelength of the ultraviolet sterilization zone is 250nm to 280nm, and the irradiation time of the recycled purified water in the ultraviolet sterilization zone is 10s to 60s. The preset differential pressure control rules include: when the operating differential pressure of the coarse-grained fissure infiltration section, micro-fissure adsorption section or iron-manganese catalytic purification section is greater than 30 kPa and not greater than 50 kPa, and the duration is greater than 5 min, the source water to be purified is stopped from entering the biomimetic rock stratum infiltration path, and a pulse water flow is input to the corresponding purification section with an operating differential pressure greater than 30 kPa and not greater than 50 kPa. When the operating pressure difference of the coarse-grained fissure infiltration section, micro-fissure adsorption section or iron-manganese catalytic purification section is greater than 50 kPa and the duration is greater than 5 min, the source water to be purified is stopped from entering the biomimetic rock layer infiltration path, and the backwash water is allowed to flow from the outlet side to the inlet side along the biomimetic rock layer infiltration path. The duration of a single pulse water flow is 3 to 10 seconds, the interval between two adjacent pulse water flows is 10 to 30 seconds, the number of pulses is 3 to 8, the apparent flow rate of the backwash water is 8 to 15 m / h, and the backwash time is 3 to 10 minutes.

[0015] The Qingshan Spring Water Deep Purification Device Based on Biomimetic Rock Layer Filtration includes: The system includes a source water pretreatment module, a water quality sensing module, a biomimetic rock strata purification module, a mineral buffering and regulation module, an end-point safety assurance module, and an operation control module. The source water pretreatment module is used to perform flow stabilization treatment, air venting treatment and primary interception treatment on the collected Qingshan Spring source water to obtain the source water to be purified. The water quality sensing module is located on the outlet side of the source water pretreatment module. It is used to obtain the turbidity, pH value, conductivity, oxidation-reduction potential, dissolved oxygen content, iron content, manganese content and total organic carbon content of the source water to be purified according to the same sampling cycle, and send the water quality parameters obtained in the same sampling cycle to the operation control module. The biomimetic rock stratum purification module is located on the outlet side of the water quality sensing module. The biomimetic rock stratum purification module includes a coarse-grained fissure infiltration section, a micro-fissure adsorption section, an iron-manganese catalytic purification section, and an organic matter buffer purification section that are connected sequentially along the water flow direction. The coarse-grained fissure infiltration section, the micro-fissure adsorption section, and the iron-manganese catalytic purification section are each equipped with a differential pressure detection unit for obtaining the operating differential pressure. The mineral buffer adjustment module is connected to the outlet side of the biomimetic rock layer purification module. The mineral buffer adjustment module includes a mineral buffer path, a main purified water bypass path, and a flow adjustment unit. The mineral buffer path includes a carbonate mineral buffer section and a silicate mineral buffer section connected sequentially along the water flow direction. The outlet side of the mineral buffer path merges with the outlet side of the main purified water bypass path. The end-of-line safety protection module is located on the outlet side after the mineral buffer path and the main purified water bypass path converge. The end-of-line safety protection module includes a membrane filtration unit and an ultraviolet sterilization unit. The operation control module includes a water quality data receiving unit, a micro-aeration control unit, a diversion control unit, and a differential pressure recovery control unit. The water quality data receiving unit is connected to the water quality sensing module, the micro-aeration control unit is connected to the micro-aeration execution unit on the inlet side of the iron-manganese catalytic purification section, the diversion control unit is connected to the flow regulation unit, and the differential pressure recovery control unit is connected to the differential pressure detection unit, the pulse loosening execution unit, and the backwashing execution unit. Among them, the micro-aeration control unit controls the air-to-water volume ratio of the micro-aeration execution unit according to the iron content, manganese content and dissolved oxygen content, the diversion control unit controls the proportion of main purified water entering the mineral buffer path according to the conductivity and pH value, and the differential pressure recovery control unit controls the pulse loosening execution unit or backwashing execution unit to operate according to the operating differential pressure.

[0016] In summary, the present invention has the following main beneficial effects: This application sequentially processes the source water from Qingshan Spring through a process involving stable flow degassing, primary interception, coarse-particle fissure filtration, micro-fissure adsorption, iron-manganese catalytic purification, and organic matter buffering purification. This allows the source water to first disperse and intercept large particles in a larger pore layer before entering a smaller pore layer for contact adsorption. The micro-aeration intensity is adjusted based on iron, manganese, and dissolved oxygen content before the iron-manganese catalytic purification stage. This ensures that even when the source water quality changes due to rainfall, low water levels, or water intake conditions, the purification process continues in a phased manner, following the sequence of particulate matter interception, colloidal adsorption, iron-manganese oxidation interception, and organic matter adsorption. This avoids the direct entry of the source water into the fine-pore filter layer, which could cause rapid clogging at the front end. It also prevents insufficient reaction conditions in the iron-manganese catalytic purification stage when iron-manganese content is high or dissolved oxygen is insufficient. This results in a clear, segmented treatment path and adaptability to different water quality conditions during the deep purification process.

[0017] This application establishes a mineral buffer path and a main purified water bypass path on the outlet side of a biomimetic rock strata purification module. The proportion of main purified water entering the mineral buffer path is controlled based on the conductivity and pH value of the main purified water. This allows a portion of the main purified water to sequentially pass through carbonate and silicate mineral buffer sections when needed, before being back-mixed with the main purified water that did not enter the mineral buffer path. This achieves the effect of preserving the mineral characteristics of spring water while reducing the risks of mineral release fluctuations and pH shifts caused by the entire water flow consistently passing through mineral filter media. Compared to methods that first perform complete desalination and then replenish minerals, this application does not simply add purified water post-processing. Instead, it uses the real-time conductivity and pH value of the main purified water as the basis for diversion, matching the mineral buffering process with the state of the source water itself. This makes the operation of the mineral buffer path more suitable for the deep purification needs under fluctuating spring water quality conditions.

[0018] This application obtains the operating pressure difference between the inlet and outlet sides of the coarse-grained fractured infiltration section, the micro-fractured adsorption section, and the iron-manganese catalytic purification section, respectively, and controls pulse loosening or backwashing according to the range of operating pressure difference. This allows the biomimetic rock stratum infiltration path to undergo staged recovery when the pressure difference increases, thereby reducing the risk of localized caking, short-circuiting, and continuous blockage of the filter layer. When the operating pressure difference is in a low abnormal range, the corresponding purification section is intermittently disturbed by pulsed water flow. When the operating pressure difference further increases, backwash water flows from the outlet side to the inlet side for recovery. The above control method ensures that the filter layer recovery action corresponds to the degree of blockage, avoiding direct strong backwashing that would cause interlayer disturbance when the pressure difference is slightly abnormal, and also avoiding weak disturbance that fails to restore the water flow state when the pressure difference continues to rise. Attached Figure Description

[0019] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 refer to Figure 1 A deep purification method for spring water from Qingshan Mountain based on biomimetic rock strata filtration includes the following steps: S1: The collected spring water is subjected to flow stabilization treatment, air venting treatment and primary interception treatment to obtain the source water to be purified; S2: Perform online testing on the source water to be purified to obtain the turbidity, pH value, conductivity, oxidation-reduction potential, dissolved oxygen content, iron content, manganese content and total organic carbon content of the source water to be purified; S3: The source water to be purified enters the biomimetic rock stratum infiltration path and passes through the coarse-grained fissure infiltration section, the micro-fissure adsorption section, the iron-manganese catalytic purification section and the organic matter buffer purification section in sequence along the water flow direction to obtain the main purified water; S4: Control the micro-aeration intensity on the inlet side of the iron-manganese catalytic purification section based on the iron content, manganese content, and dissolved oxygen content. S5: Based on the conductivity and pH value of the main purified water, control the proportion of the main purified water entering the mineral buffer path; when the main purified water enters the mineral buffer path, make the main purified water entering the mineral buffer path pass through the carbonate mineral buffer section and the silicate mineral buffer section in sequence to obtain mineral buffer water. S6: Mix the mineral buffer water with the main purified water that did not enter the mineral buffer path to obtain mixed purified water; S7: Membrane filtration and ultraviolet sterilization are performed on the recycled purified water to obtain deeply purified spring water; Specifically, the operating pressure difference between the inlet and outlet sides of the coarse-grained fissure infiltration section, the micro-fissure adsorption section, and the iron-manganese catalytic purification section are obtained respectively, and the biomimetic rock stratum infiltration path is controlled by pulse loosening or backwashing according to the preset pressure difference control rules.

[0022] This method is suitable for deep purification of water sourced from mountain fissures, shallow springs, or collected mountain spring water. The turbidity, iron content, manganese content, dissolved oxygen content, conductivity, and organic matter load of the mountain spring water source will change during rainfall, dry seasons, water level fluctuations, and changes in water intake points. If a fixed series filtration path is used, problems such as localized clogging of the filter layer, unstable iron and manganese removal conditions, and difficulty in controlling the degree of mineral release can easily occur when the source water fluctuates. This embodiment uses a parallel operation of a main purification path and a mineral buffer path. The main purification path undertakes staged infiltration, iron and manganese catalytic purification, and organic matter buffer purification. The mineral buffer path only receives a portion of the main purified water allocated according to conductivity and pH value, and mixes it with the main purified water before the final safety protection module.

[0023] The device in this embodiment includes a source water pretreatment module, a water quality sensing module, a biomimetic rock stratum purification module, a mineral buffer regulation module, an end-point safety assurance module, and an operation control module. The effluent side of the source water pretreatment module is connected to the water quality sensing module, and the effluent side of the water quality sensing module is connected to the biomimetic rock stratum purification module. The effluent side of the biomimetic rock stratum purification module is connected to both the mineral buffer regulation module and the main purified water bypass path. The effluent side of the mineral buffer regulation module merges with the effluent side of the main purified water bypass path, and the merged water flow enters the end-point safety assurance module. The operation control module receives water quality data output from the water quality sensing module and operating pressure difference data output from the biomimetic rock stratum purification module, and sends control signals to the micro-aeration execution unit, flow regulation unit, pulse loosening execution unit, and backwashing execution unit.

[0024] In practice, the collected Qingshan Spring water first enters the source water pretreatment module. The source water pretreatment module includes a source water buffer chamber, an exhaust channel, and a primary interception device. The source water buffer chamber receives the Qingshan Spring water, which remains in the buffer chamber for 3 to 10 minutes. The residence time in the source water buffer chamber is determined according to the following formula: ; In the formula, The residence time of Qingshan Spring water in the source water buffer chamber, in minutes; The effective volume of the source water buffer chamber is expressed in liters (L). This refers to the flow rate of Qingshan Spring water entering the source water buffer chamber, expressed in L / min. By adjusting the effective volume of the source water buffer chamber or the inflow rate of Qingshan Spring water, the... Keep it within 3 to 10 minutes.

[0025] During the residence of the Qingshan Spring water source within the buffer chamber, the gas entrained in the water accumulates at the top of the buffer chamber and is discharged through the venting channel. The discharged Qingshan Spring water then passes through a primary interceptor. The primary interceptor has pore sizes ranging from 80μm to 200μm and is used to intercept leaf debris, mud and sand aggregates, and large particulate impurities. After flow stabilization, venting, and primary interception treatments, the purified source water is obtained.

[0026] The source water to be purified enters the water quality sensing module. This module includes a detection flow chamber and connected detectors for turbidity, pH, conductivity, oxidation-reduction potential, dissolved oxygen, iron, manganese, and total organic carbon. The detection flow chamber allows the source water to flow continuously through the detection areas of each detector. Each detector collects data according to the same sampling cycle, ranging from 30 to 300 seconds. The turbidity, pH, conductivity, oxidation-reduction potential, dissolved oxygen, iron, manganese, and total organic carbon data acquired within each sampling cycle are sent as a set of water quality data to the operation control module.

[0027] A set of water quality data is expressed by the following formula: ; In the formula, Indicates the first A set of water quality data generated within a sampling period; Indicates the first Turbidity within a sampling period; This represents the pH value during the i-th sampling period; Indicates the first Conductivity within each sampling period; Indicates the first Redox potential within each sampling cycle; Indicates the first Dissolved oxygen content within a sampling period; Indicates the first Iron content within a sampling period; Indicates the first Manganese content within each sampling period; Indicates the first Total organic carbon content within each sampling period. All of the above parameters were obtained directly from the corresponding detectors.

[0028] In this embodiment, turbidity, redox potential, and total organic carbon content are used as auxiliary monitoring parameters for the operating status of the source water to be purified. Turbidity is used to determine changes in the particulate matter load of the source water, redox potential is used to help determine the oxidation environment on the inlet side of the iron-manganese catalytic purification section, and total organic carbon content is used to help determine the inlet load of the organic matter buffer purification section. When the operation control module performs micro-aeration control, diversion control, and differential pressure recovery control, it uses iron content, manganese content, dissolved oxygen content, conductivity, pH value, and operating differential pressure as direct control basis, and turbidity, redox potential, and total organic carbon content as the basis for operation records and operating condition verification.

[0029] After online testing is completed, the source water to be purified enters the biomimetic rock stratum purification module. This module forms a biomimetic rock stratum infiltration path, which, along the water flow direction, sequentially comprises a coarse-grained fissure infiltration section, a micro-fissure adsorption section, an iron-manganese catalytic purification section, and an organic matter buffer purification section. These purification sections are connected sequentially according to the water flow direction, ensuring that the source water first passes through the larger particle size infiltration area, then through the smaller pore size adsorption area, then through the iron-manganese catalytic purification area, and finally through the organic matter buffer adsorption area.

[0030] The apparent flow rate of each purification section is determined according to the following formula: ; In the formula, For the first The apparent flow rate of each purification section is expressed in m / h. To enter the The flow rate of each purification section, in m³ / s. h; For the first The effective cross-sectional area of ​​each purification section, in m². . No. Each purification section is a coarse-grained fissure infiltration section, a micro-fissure adsorption section, an iron-manganese catalytic purification section, or an organic matter buffer purification section. By adjusting the water flow rate or setting the effective cross-sectional area of ​​the corresponding purification section, the apparent flow velocity of the coarse-grained fissure infiltration section is 4 m / h to 8 m / h, the apparent flow velocity of the micro-fissure adsorption section is 2 m / h to 5 m / h, the apparent flow velocity of the iron-manganese catalytic purification section is 2 m / h to 4 m / h, and the apparent flow velocity of the organic matter buffer purification section is 3 m / h to 6 m / h.

[0031] The coarse-grained fissure infiltration section includes a first inorganic particle layer and a second inorganic particle layer arranged sequentially along the water flow direction. The particle size of the first inorganic particle layer is 3mm to 8mm, and the particle size of the second inorganic particle layer is 1mm to 3mm. The first inorganic particle layer can be composed of gravel particles, quartz sand particles, or sintered ceramic particles, and the second inorganic particle layer can be composed of quartz sand particles or sintered ceramic particles. In this embodiment, the inorganic particles referred to in the first and second inorganic particle layers are mineral particles or sintered ceramic particles that do not undergo significant dissolution and maintain their particle shape under the purification operation conditions of this embodiment. The first inorganic particle layer is used to form water passage channels with larger pores, and the second inorganic particle layer is used to receive the water effluent from the first inorganic particle layer and form water passage channels with smaller pores. When a permeable separator is provided between the first and second inorganic particle layers, the pore size of the permeable separator is smaller than the minimum particle size of both the first and second inorganic particle layers.

[0032] The microfracture adsorption section comprises a porous ceramic particle layer and a zeolite particle layer arranged sequentially along the water flow direction. The porous ceramic particle layer is located on the inlet side of the microfracture adsorption section, and the zeolite particle layer is located on the outlet side of the porous ceramic particle layer. When the source water to be purified enters the microfracture adsorption section from the coarse-grained fracture filtration section, the water flow changes from a state of filtration through larger pores to a state of contact through smaller pores, preventing the source water from directly entering the fine-pore adsorption layer and causing rapid blockage at the front end of the microfracture adsorption section.

[0033] The iron-manganese catalytic purification section includes a manganese sand particle layer, which is located on the effluent side of the micro-fracture adsorption section. A micro-aeration unit is installed on the influent side of the iron-manganese catalytic purification section. This unit includes a main aeration pipe, branch aeration pipes, and micro-aeration valves. The main aeration pipe is connected to the air supply end, multiple branch aeration pipes are spaced apart along the influent cross-section of the iron-manganese catalytic purification section, and the micro-aeration valves are connected to the operation control module.

[0034] The operation control module controls the micro-aeration intensity on the inlet side of the iron-manganese catalytic purification section based on the iron, manganese, and dissolved oxygen content. Specifically, when... Greater than 0.3 mg / L, or Greater than 0.1 mg / L, or When the concentration is less than 5 mg / L, the operation control module controls the micro-aeration valve to open, enabling micro-aeration on the inlet side of the iron-manganese catalytic purification section, and controlling the air-to-water volume ratio of the micro-aeration to be between 0.02:1 and 0.12:1. Not more than 0.3 mg / L Not greater than 0.1 mg / L and When the concentration is not less than 5 mg / L, the operation control module controls the micro-aeration valve to close and stop micro-aeration.

[0035] In this embodiment, the iron content of 0.3 mg / L, the manganese content of 0.1 mg / L, and the pH value of 6.5 to 8.5 are used as the operating control boundaries, derived from the conventional limit requirements for iron, manganese, and pH in drinking water quality control. These values ​​are used in this embodiment to determine whether to increase the oxidation conditions on the inlet side of the iron-manganese catalytic purification section and whether to reduce the inlet proportion of the mineral buffer path; they do not imply that this embodiment can only treat source water that has already met the above-mentioned limit requirements.

[0036] The air-to-water volume ratio for micro-aeration is determined by the following formula: ; In the formula, This indicates the air-to-water volume ratio in micro-aeration. This represents the volume of gas entering the inlet side of the iron-manganese catalytic purification section within one control cycle, expressed in L. This represents the volume of water entering the iron-manganese catalytic purification section within the same control cycle, expressed in liters (L). In actual control, the gas-to-water volume ratio for micro-aeration can also be determined based on the gas and water flow rates, calculated as follows: ; In the formula, This represents the gas flow rate entering the inlet side of the iron-manganese catalytic purification section within one control cycle, expressed in L / min. This indicates the water flow rate entering the iron-manganese catalytic purification section within the same control cycle, expressed in L / min. The operation control module adjusts the opening of the micro-aeration valve or the output flow rate at the air supply end to... Keep it within the range of 0.02:1 to 0.12:1.

[0037] The organic matter buffer purification section includes a granular activated carbon layer, which is located on the effluent side of the iron-manganese catalytic purification section. The source water to be purified passes sequentially through the coarse-grained fissure filtration section, the micro-fissure adsorption section, the iron-manganese catalytic purification section, and the organic matter buffer purification section to obtain the main purified water.

[0038] After the main purified water flows out from the outlet side of the biomimetic rock strata purification module, it can enter either the mineral buffer path or the main purified water bypass path. The mineral buffer path and the main purified water bypass path are parallel waterways; not all main purified water is forced to pass through the mineral buffer path. The operation control module controls the proportion of main purified water entering the mineral buffer path based on the conductivity and pH value of the main purified water.

[0039] The proportion of minerals entering the buffer path is determined by the following formula: ; In the formula, This indicates the proportion of the main purified water entering the mineral buffer path to the total flow rate of the main purified water. This indicates the main purified water flow rate entering the mineral buffer path, in L / min; This indicates the total flow rate of the main purified water output by the biomimetic rock strata purification module, in L / min. This includes the flow rate entering the mineral buffer path and the flow rate entering the main purified water bypass path.

[0040] When the conductivity of the main purified water is less than 120 μS / cm and the pH value is between 6.5 and 8.5, the operation control module controls... The percentage is 15% to 35%. When the conductivity of the main purified water is 120 μS / cm to 350 μS / cm and the pH value is 6.5 to 8.5, the operation control module controls... The percentage is 5% to 20%. When the conductivity of the main purified water is greater than 350 μS / cm, or the pH value is less than 6.5, or the pH value is greater than 8.5, the operation control module will activate. It ranges from 0% to 5%. When When the concentration is 0%, the main purified water does not enter the mineral buffer path; instead, it enters subsequent treatment via the main purified water bypass path. When the concentration is greater than 0%, the main purified water entering the mineral buffer path passes through the carbonate mineral buffer section and the silicate mineral buffer section in sequence.

[0041] In this embodiment, 120 μS / cm and 350 μS / cm are used as preset conductivity boundaries for the mineral buffer path diversion control. Conductivity is used to characterize the changing trend of the total ion content in the main purified water. When the conductivity is below 120 μS / cm, the operation control module determines the main purified water to be in a low conductivity state and increases the proportion entering the mineral buffer path; when the conductivity is between 120 μS / cm and 350 μS / cm, the operation control module determines the main purified water to be in an intermediate conductivity state and maintains a lower proportion of mineral buffer; when the conductivity is above 350 μS / cm, the operation control module reduces or shuts down the mineral buffer path. The above conductivity boundaries are process settings used for diversion control in this embodiment, and their function is to determine the influent proportion of the mineral buffer path, rather than to evaluate whether the effluent is qualified.

[0042] The mineral buffer path includes a carbonate mineral buffer section and a silicate mineral buffer section arranged sequentially along the water flow direction. The carbonate mineral buffer section can contain calcium carbonate particles, calcite particles, or dolomite particles; the silicate mineral buffer section can contain maifanite particles, volcanic rock particles, or silicate ceramic particles. The residence time of the main purified water entering the mineral buffer path is 2 to 8 minutes in the carbonate mineral buffer section and 3 to 12 minutes in the silicate mineral buffer section.

[0043] The residence time for the carbonate mineral buffer zone and the silicate mineral buffer zone is determined according to the following formula: ; In the formula, For the first The residence time of each mineral buffer zone, in minutes; For the first The effective water passage volume of each mineral buffer section is expressed in liters (L). The main purified water flow rate entering the mineral buffer path, in L / min; Each mineral buffer section is either a carbonate mineral buffer section or a silicate mineral buffer section. By adjusting the effective flow volume of the mineral buffer section or the main purified water flow rate entering the mineral buffer path, the residence time of each mineral buffer section is made to fall within the corresponding range.

[0044] The main purified water entering the mineral buffer path passes sequentially through the carbonate mineral buffer section and the silicate mineral buffer section to obtain mineral buffer water. After flowing out of the mineral buffer path, the mineral buffer water is back-mixed with the main purified water that did not enter the mineral buffer path. During back-mixing, the mineral buffer water and the main purified water that did not enter the mineral buffer path enter the mixing channel together and sequentially pass through the first turbulence zone and the second turbulence zone. The flow direction of the first turbulence zone and the flow direction of the second turbulence zone are offset in the direction of the water flow cross section, so that the two water flows are mixed before entering the end safety protection module to obtain back-mixed purified water.

[0045] The re-mixed purified water enters the end-point safety protection module. This module includes a membrane filtration unit and an ultraviolet (UV) sterilization unit. The re-mixed purified water first passes through an ultrafiltration membrane with a pore size of 0.02μm to 0.1μm, and then through a UV sterilization zone. The UV wavelength in the UV sterilization zone is 250nm to 280nm, and the re-mixed purified water is irradiated in this zone for 10s to 60s. After membrane filtration and UV sterilization, deeply purified spring water is obtained.

[0046] During the operation of the biomimetic rock strata infiltration path, the operating pressure difference between the inlet and outlet sides of the coarse-grained fracture infiltration section, the micro-fracture adsorption section, and the iron-manganese catalytic purification section were obtained respectively. The operating pressure difference was determined according to the following formula: ; In the formula, Indicates the first The operating pressure difference of each purification section is expressed in kPa. ,in indicates the first The inlet pressure of each purification section is expressed in kPa. ,out indicates the first The pressure on the effluent side of each purification section, in kPa; Each purification section is either a coarse-grained fissure filtration section, a micro-fissure adsorption section, or an iron-manganese catalytic purification section.

[0047] The operation control module uses the differential pressure data continuously output by the differential pressure detection unit as the basis for judgment. When the operating differential pressure of the same purification section meets the corresponding differential pressure condition in multiple consecutive detection cycles and the cumulative duration is greater than 5 minutes, the operation control module executes the corresponding pulse loosening or backwashing action; if the operating differential pressure drops below the corresponding differential pressure condition before the cumulative duration reaches 5 minutes, the cumulative duration restarts.

[0048] When the operating pressure difference of the coarse-grained fissure infiltration section, micro-fissure adsorption section, or iron-manganese catalytic purification section is greater than 30 kPa but not greater than 50 kPa, and the duration is greater than 5 minutes, the operation control module stops the source water to be purified from entering the biomimetic rock stratum infiltration path and inputs a pulsed water flow to the corresponding purification section with an operating pressure difference greater than 30 kPa but not greater than 50 kPa. The duration of a single pulsed water flow is 3 to 10 seconds, the interval between two adjacent pulsed water flows is 10 to 30 seconds, and the number of pulses is 3 to 8. The pulsed water flow is input by the pulse loosening execution unit to the inlet side, outlet side, or lateral connection position of the corresponding purification section, and the pulse loosening process does not change the front-to-back order of the coarse-grained fissure infiltration section, micro-fissure adsorption section, iron-manganese catalytic purification section, and organic matter buffer purification section.

[0049] When the operating pressure difference in the coarse-grained fissure infiltration section, micro-fissure adsorption section, or iron-manganese catalytic purification section exceeds 50 kPa and lasts for more than 5 minutes, the operation control module stops the source water to be purified from entering the biomimetic rock stratum infiltration path and starts the backwash execution unit, causing the backwash water to flow from the outlet side to the inlet side along the biomimetic rock stratum infiltration path. The apparent flow velocity of the backwash water is 8 m / h to 15 m / h, and the backwash time is 3 minutes to 10 minutes. After the backwash is completed, the operation control module resumes the entry of the source water to be purified into the biomimetic rock stratum infiltration path and continues to acquire water quality data and operating pressure difference data according to the same sampling cycle.

[0050] In this embodiment, the operation control module can be a programmable logic controller (PLC), an industrial computer, or an embedded controller with input / output interfaces. The water quality sensing module inputs water quality data to the operation control module, the differential pressure detection unit inputs operating differential pressure data to the operation control module, and the operation control module outputs control signals to the micro-aeration execution unit, the flow regulation unit, the pulse loosening execution unit, and the backwash execution unit. The micro-aeration execution unit adjusts the micro-aeration intensity on the inlet side of the iron-manganese catalytic purification section; the flow regulation unit adjusts the ratio of main purified water entering the mineral buffer path and the main purified water bypass path; the pulse loosening execution unit inputs pulsed water flow to the corresponding purification section; and the backwash execution unit causes the backwash water to flow from the outlet side to the inlet side along the biomimetic rock strata infiltration path.

[0051] The water circuit organization in this embodiment differs from the treatment method that fixes all source water or all purified water in series through mineral filter media, and also differs from the treatment method that first completely desalinates through reverse osmosis and then replenishes minerals. The main purification path undertakes the staged infiltration of source water, iron-manganese catalytic purification, and organic matter buffer purification. The mineral buffer path receives a portion of the main purified water according to conductivity and pH value, and the two are back-mixed before the end safety protection module. The micro-aeration intensity on the inlet side of the iron-manganese catalytic purification section is determined by the iron content, manganese content, and dissolved oxygen content. The inlet ratio of the mineral buffer path is determined by the conductivity and pH value of the main purified water. The recovery action of the biomimetic rock strata infiltration path is determined by the operating pressure difference. Therefore, each treatment step has clear data input, control output, and execution target.

[0052] In a specific operational example, the source water from Qingshan Spring enters the source water buffer chamber and remains for 5 minutes. After venting, it passes through a primary interceptor with a pore size of 100μm. The water quality sensing module acquires a set of water quality data every 60 seconds. The source water to be purified sequentially passes through a coarse-grained fissure infiltration section, a micro-fissure adsorption section, an iron-manganese catalytic purification section, and an organic matter buffer purification section. The apparent flow rate in the coarse-grained fissure infiltration section is 6 m / h, in the micro-fissure adsorption section it is 3 m / h, in the iron-manganese catalytic purification section it is 3 m / h, and in the organic matter buffer purification section it is 4 m / h. When the detected iron content is greater than 0.3 mg / L or the manganese content is greater than 0.1 mg / L, the operation control module controls the air-to-water volume ratio of micro-aeration to be 0.06:1. When the conductivity of the main purified water is 100 μS / cm and the pH value is 7.2, the operation control module controls the main purified water entering the mineral buffer path to account for 25% of the total flow rate of the main purified water. The main purified water entering the mineral buffer path stays in the carbonate mineral buffer section for 5 minutes and in the silicate mineral buffer section for 8 minutes. The remixed purified water passes through a 0.05 μm ultrafiltration membrane and then enters the ultraviolet sterilization zone with a wavelength of 254 nm, where it is irradiated for 30 seconds. The parameters in this specific operating example all fall within the aforementioned parameter range and are used to illustrate the implementation of this embodiment, not to limit the scope of protection of this invention.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration, characterized in that, Includes the following steps: S1: The collected spring water is subjected to flow stabilization treatment, air venting treatment and primary interception treatment to obtain the source water to be purified; S2: Perform online testing on the source water to be purified to obtain the turbidity, pH value, conductivity, oxidation-reduction potential, dissolved oxygen content, iron content, manganese content and total organic carbon content of the source water to be purified; S3: The source water to be purified enters the biomimetic rock stratum infiltration path and passes through the coarse-grained fissure infiltration section, the micro-fissure adsorption section, the iron-manganese catalytic purification section and the organic matter buffer purification section in sequence along the water flow direction to obtain the main purified water; S4: Control the micro-aeration intensity on the inlet side of the iron-manganese catalytic purification section based on the iron content, manganese content, and dissolved oxygen content. S5: Based on the conductivity and pH value of the main purified water, control the proportion of the main purified water entering the mineral buffer path; when the main purified water enters the mineral buffer path, make the main purified water entering the mineral buffer path pass through the carbonate mineral buffer section and the silicate mineral buffer section in sequence to obtain mineral buffer water. S6: Mix the mineral buffer water with the main purified water that did not enter the mineral buffer path to obtain mixed purified water; S7: Membrane filtration and ultraviolet sterilization are performed on the recycled purified water to obtain deeply purified spring water; Specifically, the operating pressure difference between the inlet and outlet sides of the coarse-grained fissure infiltration section, the micro-fissure adsorption section, and the iron-manganese catalytic purification section are obtained respectively, and the biomimetic rock stratum infiltration path is controlled by pulse loosening or backwashing according to the preset pressure difference control rules.

2. The method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration according to claim 1, characterized in that, The collected Qingshan Spring water undergoes flow stabilization treatment, venting treatment, and primary interception treatment, including: The collected spring water is introduced into the source water buffer chamber and left to stand in the source water buffer chamber for 3 to 10 minutes. During the retention of the spring water in Qingshan, the gas accumulated in the upper part of the spring water buffer chamber is discharged. After the exhaust gas is released, the source water from Qingshan Spring passes through a primary interceptor with a pore size of 80μm to 200μm to obtain the source water to be purified.

3. The method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration according to claim 2, characterized in that, When conducting online testing of the source water to be purified, the turbidity, pH value, conductivity, oxidation-reduction potential, dissolved oxygen content, iron content, manganese content and total organic carbon content of the source water to be purified are obtained in the same sampling period of 30s to 300s, and the water quality parameters obtained in the same sampling period are used as a set of water quality data.

4. The method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration according to claim 3, characterized in that, When the source water to be purified passes through the biomimetic rock strata infiltration path, the apparent flow rate through the coarse-grained fissure infiltration section is 4 m / h to 8 m / h, the apparent flow rate through the micro-fissure adsorption section is 2 m / h to 5 m / h, the apparent flow rate through the iron-manganese catalytic purification section is 2 m / h to 4 m / h, and the apparent flow rate through the organic matter buffer purification section is 3 m / h to 6 m / h.

5. The method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration according to claim 4, characterized in that, The coarse-grained fissure infiltration section includes a first inorganic particle layer and a second inorganic particle layer arranged sequentially along the water flow direction. The particle size of the first inorganic particle layer is 3mm to 8mm, and the particle size of the second inorganic particle layer is 1mm to 3mm. The microcrack adsorption section includes a porous ceramic particle layer and a zeolite particle layer arranged sequentially along the water flow direction. The iron-manganese catalytic purification section includes a layer of manganese sand particles; The organic matter buffer purification section includes a granular activated carbon layer.

6. The method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration according to claim 5, characterized in that, Based on the iron content, manganese content, and dissolved oxygen content, the micro-aeration intensity on the inlet side of the iron-manganese catalytic purification section is controlled as follows: When the iron content is greater than 0.3 mg / L, or the manganese content is greater than 0.1 mg / L, or the dissolved oxygen content is less than 5 mg / L, micro-aeration is carried out on the inlet side of the iron-manganese catalytic purification section, and the air-water volume ratio of micro-aeration is controlled to be 0.02:1 to 0.12:

1. When the iron content is no more than 0.3 mg / L, the manganese content is no more than 0.1 mg / L, and the dissolved oxygen content is no less than 5 mg / L, stop micro-aeration.

7. The method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration according to claim 6, characterized in that, Based on the conductivity and pH value of the main purified water, the proportion of main purified water entering the mineral buffer pathway is controlled as follows: When the conductivity of the main purified water is less than 120 μS / cm and the pH value is between 6.5 and 8.5, the main purified water entering the mineral buffer path should account for 15% to 35% of the total flow rate of the main purified water. When the conductivity of the main purified water is between 120 μS / cm and 350 μS / cm, and the pH value is between 6.5 and 8.5, the main purified water entering the mineral buffer path should account for 5% to 20% of the total flow rate of the main purified water. When the conductivity of the main purified water is greater than 350 μS / cm, or the pH value is less than 6.5, or the pH value is greater than 8.5, the main purified water entering the mineral buffer path is controlled to account for 0% to 5% of the total flow rate of the main purified water.

8. The method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration according to claim 7, characterized in that, The main purified water entering the mineral buffer path has a residence time of 2 to 8 minutes in the carbonate mineral buffer section and 3 to 12 minutes in the silicate mineral buffer section. When the mineral buffer water is mixed with the main purified water that does not enter the mineral buffer path, the mineral buffer water and the main purified water that does not enter the mineral buffer path pass through the first turbulence zone and the second turbulence zone in sequence. The water flow direction of the first turbulence zone and the water flow direction of the second turbulence zone are misaligned in the direction of the water flow cross section.

9. The method for deep purification of spring water in Qingshan based on biomimetic rock strata filtration according to claim 8, characterized in that, Membrane filtration and ultraviolet sterilization of the recycled purified water include: passing the recycled purified water through an ultrafiltration membrane with a pore size of 0.02μm to 0.1μm, and then through an ultraviolet sterilization zone with an ultraviolet wavelength of 250nm to 280nm, and the irradiation time of the recycled purified water in the ultraviolet sterilization zone is 10s to 60s. The preset differential pressure control rules include: when the operating differential pressure of the coarse-grained fissure infiltration section, micro-fissure adsorption section or iron-manganese catalytic purification section is greater than 30 kPa and not greater than 50 kPa, and the duration is greater than 5 min, the source water to be purified is stopped from entering the biomimetic rock stratum infiltration path, and a pulse water flow is input to the corresponding purification section with an operating differential pressure greater than 30 kPa and not greater than 50 kPa. When the operating pressure difference of the coarse-grained fissure infiltration section, micro-fissure adsorption section or iron-manganese catalytic purification section is greater than 50 kPa and the duration is greater than 5 min, the source water to be purified is stopped from entering the biomimetic rock layer infiltration path, and the backwash water is allowed to flow from the outlet side to the inlet side along the biomimetic rock layer infiltration path. The duration of a single pulse water flow is 3 to 10 seconds, the interval between two adjacent pulse water flows is 10 to 30 seconds, the number of pulses is 3 to 8, the apparent flow rate of the backwash water is 8 to 15 m / h, and the backwash time is 3 to 10 minutes.

10. A deep purification device for spring water based on biomimetic rock strata filtration, applicable to the deep purification method for spring water based on biomimetic rock strata filtration as described in any one of claims 1-9, characterized in that, include: The system includes a source water pretreatment module, a water quality sensing module, a biomimetic rock strata purification module, a mineral buffering and regulation module, an end-point safety assurance module, and an operation control module. The source water pretreatment module is used to perform flow stabilization treatment, air venting treatment and primary interception treatment on the collected Qingshan Spring source water to obtain the source water to be purified. The water quality sensing module is located on the outlet side of the source water pretreatment module. It is used to obtain the turbidity, pH value, conductivity, oxidation-reduction potential, dissolved oxygen content, iron content, manganese content and total organic carbon content of the source water to be purified according to the same sampling cycle, and send the water quality parameters obtained in the same sampling cycle to the operation control module. The biomimetic rock stratum purification module is located on the outlet side of the water quality sensing module. The biomimetic rock stratum purification module includes a coarse-grained fissure infiltration section, a micro-fissure adsorption section, an iron-manganese catalytic purification section, and an organic matter buffer purification section that are connected sequentially along the water flow direction. The coarse-grained fissure infiltration section, the micro-fissure adsorption section, and the iron-manganese catalytic purification section are each equipped with a differential pressure detection unit for obtaining the operating differential pressure. The mineral buffer adjustment module is connected to the outlet side of the biomimetic rock layer purification module. The mineral buffer adjustment module includes a mineral buffer path, a main purified water bypass path, and a flow adjustment unit. The mineral buffer path includes a carbonate mineral buffer section and a silicate mineral buffer section connected sequentially along the water flow direction. The outlet side of the mineral buffer path merges with the outlet side of the main purified water bypass path. The end-of-line safety protection module is located on the outlet side after the mineral buffer path and the main purified water bypass path converge. The end-of-line safety protection module includes a membrane filtration unit and an ultraviolet sterilization unit. The operation control module includes a water quality data receiving unit, a micro-aeration control unit, a diversion control unit, and a differential pressure recovery control unit. The water quality data receiving unit is connected to the water quality sensing module, the micro-aeration control unit is connected to the micro-aeration execution unit on the inlet side of the iron-manganese catalytic purification section, the diversion control unit is connected to the flow regulation unit, and the differential pressure recovery control unit is connected to the differential pressure detection unit, the pulse loosening execution unit, and the backwashing execution unit. Among them, the micro-aeration control unit controls the air-to-water volume ratio of the micro-aeration execution unit according to the iron content, manganese content and dissolved oxygen content, the diversion control unit controls the proportion of main purified water entering the mineral buffer path according to the conductivity and pH value, and the differential pressure recovery control unit controls the pulse loosening execution unit or backwashing execution unit to operate according to the operating differential pressure.

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