System and method for cooperatively processing intercooling water through multi-stage bypass

Abstract

The invention belongs to the technical field of inter-cooling water treatment, and relates to a system and method for cooperatively treating inter-cooling water through multi-stage bypasses. Comprising a gradient filtering unit, a modified adsorption unit and a composite adsorption unit which are sequentially connected, a bottom outlet of the gradient filtering unit is connected with a bottom inlet of the modified adsorption unit; a top outlet of the modified adsorption unit is connected with a top inlet of the composite adsorption unit; the gradient filtering unit sequentially comprises a manganese sand layer and a quartz sand layer from top to bottom; the modified adsorption unit is filled with a coal gangue modified straw biochar material; the composite adsorption unit is internally filled with a microcapsule-embedded calcium alginate-vinasse biochar composite material. According to the invention, three-stage cooperative treatment of iron suspended matter interception, sulfate radical adsorption and iron ion chelation is realized, and low-cost, green and sustainable indirect cooling water deep purification is realized by using the solid waste-based functional material.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of intercooling water treatment, and relates to a system and method for multi-stage bypass collaborative treatment of intercooling water. BACKGROUND

[0002] Intercooling water systems play a crucial role in the cooling process of industrial fields, especially in the power and chemical industries. The stable operation of intercooling water systems is essential for ensuring the continuity of the entire production process and the service life of equipment. However, during actual operation, intercooling water is subject to various corrosion factors, which not only reduce cooling efficiency but also cause equipment damage, leakage, and other serious problems, resulting in significant economic losses and safety hazards.

[0003] Among the various corrosion factors of intercooling water, iron oxide suspensions, sulfate ions (SO4 2- ), and dissolved iron ions (Fe 3+ ) are three key factors. Iron oxide suspensions can deposit in the system pipeline, forming a scale layer that reduces the inner diameter of the pipeline, increases water flow resistance, and reduces cooling efficiency. At the same time, the local environment under the scale layer forms an electrochemical corrosion cell, accelerating the corrosion process of metal pipelines. Sulfate ions (SO4 2- ) have strong corrosive properties, especially when coexisting with chloride ions (Cl - ), which can significantly enhance the corrosion damage to metal pipelines, shortening their service life. Dissolved iron ions (Fe 3+ ), as a strong oxidizing agent, can undergo redox reactions with metals, further exacerbating the corrosion of metal components, leading to a decline in equipment performance or even failure.

[0004] Currently, there have been some research and development on treatment techniques for intercooling water, but existing treatment methods have limitations. For example, traditional filtration methods can trap some large particles of iron oxide suspensions, but they are ineffective in removing small particles, making it difficult to achieve deep filtration and solve the problem of scale deposition. Chemical precipitation methods remove sulfate ions and iron ions by adding chemical reagents to the intercooling water, but this method consumes a large amount of chemical reagents, increasing the cost of treatment, and also generates a large amount of chemical sludge, causing secondary pollution and complicating subsequent sludge treatment. Ion exchange methods use ion exchange resins to selectively remove sulfate ions and iron ions, but the cost of ion exchange resins is high, and they are easily disturbed and contaminated by other ions in the water, requiring frequent regeneration treatment, which is complex and costly to operate.

[0005] In addition, the existing treatment technology often only targets a single corrosion factor, lacking a synergistic removal mechanism for multiple corrosion factors. In actual intercooling water systems, multiple corrosion factors are interrelated and influence each other, and a single treatment method is difficult to comprehensively and effectively solve the corrosion problems faced by intercooling water, and cannot meet the needs of industrial production for stable operation and efficient cooling of intercooling water systems. SUMMARY

[0006] To solve the problems in the prior art, the present application provides a multi-stage bypass synergistic treatment system and method for intercooling water, which realizes three-stage synergistic treatment of iron suspension interception, sulfate adsorption and iron ion chelation, and uses solid waste-based functional materials to achieve low-cost, green and sustainable deep purification of intercooling water.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: In a first aspect, the present application provides a multi-stage bypass synergistic treatment system for intercooling water, comprising a gradient filtration unit, a modified adsorption unit and a composite adsorption unit connected in sequence; the bottom outlet of the gradient filtration unit is connected to the bottom inlet of the modified adsorption unit; the top outlet of the modified adsorption unit is connected to the top inlet of the composite adsorption unit. The gradient filtration unit comprises a manganese sand layer and a quartz sand layer from top to bottom; the modified adsorption unit is filled with coal gangue modified straw biochar material; the composite adsorption unit is filled with microcapsule-embedded calcium alginate-distiller's grain biochar composite material.

[0008] Preferably, the volume ratio of the manganese sand layer to the quartz sand layer is 1: (1.5-2.0).

[0009] Preferably, the particle size of the manganese sand layer is 1-2 mm; the particle size of the quartz sand layer is 0.5 mm.

[0010] Preferably, the preparation method of the coal gangue modified straw biochar material is as follows: The straw is crushed and pyrolyzed under anaerobic conditions to obtain straw biochar; The coal gangue is pulverized and ball milled to obtain coal gangue powder; The coal gangue powder and the straw biochar are mixed and pyrolyzed under anaerobic conditions, and after cooling, the coal gangue modified straw biochar material is obtained after acid pickling, washing and drying.

[0011] Preferably, the mass ratio of the coal gangue powder to the straw biochar is 2:5.

[0012] Preferably, the acid pickling method is as follows: soaking in a 1 mol / L dilute hydrochloric acid solution for 24-48 hours.

[0013] Preferably, the preparation method of the microencapsulated calcium alginate-distiller's grains biochar composite material is as follows: The distiller's grains is pyrolyzed under anaerobic condition after drying and crushing to obtain the distiller's grains biochar; The sodium alginate suspension and the distiller's grains biochar are mixed to obtain a mixed solution; the mixed solution is dropped into a CaCl2 solution to perform a solidification reaction, and the microencapsulated calcium alginate-distiller's grains biochar composite material is obtained after washing, freezing and drying.

[0014] Preferably, the mass concentration of the sodium alginate suspension is 0.5% to 1.5%, and the mass ratio of the sodium alginate suspension to the distiller's grains biochar is (3 to 5):1.

[0015] In a second aspect, the present application provides a method for treating intercooled water in multiple stages by bypass, comprising the following steps: The intercooled water to be treated is filtered through a manganese sand layer and a quartz sand layer in sequence to intercept iron oxide suspensions and perform deep filtration; The filtered intercooled water is introduced into a modified adsorption unit, and SO4 2- in the water is adsorbed by the coal gangue modified straw biochar material in a specific direction; Then, the intercooled water is introduced into a composite adsorption unit, and dissolved Fe 3+ is removed by specific chelation of the microencapsulated calcium alginate-distiller's grains biochar composite material.

[0016] Preferably, when the adsorption capacity of the modified adsorption unit decreases to 70% to 75% of the initial value, backwashing regeneration is adopted; the backwashing parameters are as follows: the backwashing period is 24 to 48 hours, and the backwashing intensity is 8 to 12 L / (m 2 ·s); When the adsorption capacity of the composite adsorption unit decreases to 70% to 75% of the initial value, citric acid solution soaking regeneration is adopted; the soaking parameters are as follows: the intercooled water is soaked in a citric acid solution with a mass concentration of 5% for 2 to 4 hours, and then washed with clean water until the effluent is neutral.

[0017] Compared with the prior art, the present application has the following beneficial effects: The gradient filtration unit realizes the hierarchical interception of iron suspensions through manganese sand-quartz sand double-layer gradient filtration, the modified adsorption unit realizes the selective adsorption of SO4 2- through the specific pore size distribution and surface functional groups of the coal gangue modified straw biochar, and the composite adsorption unit realizes the specific chelation of Fe 3+ through the microcapsule structure of the microencapsulated calcium alginate-distiller's grains biochar composite material. Through the synergistic mechanism of physical interception-chemical adsorption-coordination chelation, the present application realizes the removal of suspensions, SO4 2- and Fe 3+Three key corrosion factors are synchronously removed, and solid waste-based functional materials are simultaneously used to realize resource utilization, so that a comprehensive solution integrating efficient treatment, low-cost operation and green sustainability is formed. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 A schematic diagram of a system for multi-stage bypass cooperative treatment of intercooling water according to the present application; Figure 2 A removal effect diagram of SO4 2- in intercooling water at different pH values by the system according to the present application; Figure 3 A removal effect diagram of Fe 3+ in intercooling water at different pH values by the system according to the present application.

[0020] 1, gradient filtration unit; 2, modified adsorption unit; 3, composite adsorption unit. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art on the basis of the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0023] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, if the terms "arrangement", "installation", "connection", "connection" appear, they should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] The present application will be described in further detail below with reference to the accompanying drawings: The first object of the present application is to provide a multi-stage bypass collaborative treatment of inter-cooled water system, as shown in Figure 1 The gradient filtration unit 1, the modified adsorption unit 2 and the composite adsorption unit 3 are connected in sequence; the bottom outlet of the gradient filtration unit 1 is connected with the bottom inlet of the modified adsorption unit 2; the top outlet of the modified adsorption unit 2 is connected with the top inlet of the composite adsorption unit 3; The gradient filtration unit 1 comprises a manganese sand layer and a quartz sand layer from top to bottom; the modified adsorption unit 2 is filled with coal gangue modified straw biochar material; the composite adsorption unit 3 is filled with microcapsule-embedded calcium alginate-distiller's grain biochar composite material.

[0028] The present application realizes efficient removal of key corrosion factors in intercooling water through a three-stage synergistic system of gradient filtration unit 1, modified adsorption unit 2 and composite adsorption unit 3. The gradient filtration unit 1 adopts a double-layer filter bed structure of manganese sand-quartz sand, first intercepts large particle iron oxide suspended solids through the upper layer of manganese sand, and then deeply filters through the lower layer of quartz sand to ensure efficient interception of suspended solids; the modified adsorption unit 2 is internally filled with coal gangue modified straw biochar material, which has high specific surface area and surface functional groups to directionally adsorb SO4 2- , reducing the corrosion risk of sulfate to metal pipelines; the composite adsorption unit 3 is internally filled with microcapsule-embedded calcium alginate-distiller's grains biochar composite material, which specifically captures dissolved Fe 3+ by virtue of the chelating ability of calcium alginate, preventing it from intensifying system corrosion as an oxidizing agent. The system synchronously controls corrosion factors such as suspended solids, SO4 2- and Fe 3+ through multi-stage synergistic effect, simultaneously uses industrial solid waste regenerated materials (straw, coal gangue, distiller's grains) as filler, has the advantages of low cost and environmental protection, and significantly improves the stability and safety of the intercooling water system.

[0029] In addition, the system of the present application realizes alternating change of water flow direction (intercooling water enters from the top of the gradient filtration unit 1 and exits from the bottom; enters from the bottom of the modified adsorption unit 2 and exits from the top; enters from the top of the composite adsorption unit 3 and exits from the bottom) through the design of the flow channel, thereby enhancing the mass transfer efficiency.

[0030] The volume ratio of the manganese sand layer 11 and the quartz sand layer 12 is 1: (1.5-2.0), and the particle size of the manganese sand layer 11 is 1-2 mm, and the particle size of the quartz sand layer 12 is 0.5 mm. Through the synergistic effect of coarse filtration of the upper layer of manganese sand with large particle size and fine filtration of the lower layer of fine quartz sand, both high iron suspended solids interception efficiency and prevention of premature clogging of the filter layer are ensured.

[0031] The preparation method of the coal gangue modified straw biochar material is as follows: The straw is crushed to 80-100 mesh, pyrolyzed at 600-800 DEG C under anaerobic conditions for 2-4 hours to obtain straw biochar; The coal gangue is crushed and ball milled to obtain coal gangue powder; The coal gangue powder and the straw biochar are mixed in a mass ratio of 2:5, pyrolyzed at 600-800 DEG C under anaerobic conditions for 2-4 hours, and then cooled, acid washed (such as soaked in 1 mol / L dilute hydrochloric acid for 24-48 hours), washed and dried to obtain the coal gangue modified straw biochar material.

[0032] The present application adopts the synergistic pyrolysis treatment of straw and coal gangue, so that the coal gangue modified straw biochar material has the porous properties of biochar and the mineral activity of coal gangue, not only improves the conductivity and specific surface area of the electrode, but also enhances the specific adsorption capacity of the electrode to SO4 2- . The staged anaerobic pyrolysis process ensures the stability of the carbon skeleton structure, and the subsequent acid washing process not only effectively activates the surface of the material, but also significantly improves the conductivity and ion exchange capacity of the electrode.

[0033] The preparation method of the microencapsulated calcium alginate-distiller's grains biochar composite material is as follows: The distiller's grains are dried at 60-80 DEG C, crushed to 1-5 mm, and pyrolyzed at 300-600 DEG C under anaerobic conditions for 2-4 h to obtain distiller's grains biochar; A mixed solution is obtained by mixing a sodium alginate suspension with a mass concentration of 0.5%-1.5% and distiller's grains biochar at a mass ratio of (3-5):1; the mixed solution is dropped into a calcium chloride (CaCl2) solution at a rate of 10 mL / min for solidification for 10-20 h, and after washing with desalted water, the microencapsulated calcium alginate-distiller's grains biochar composite material is obtained by freezing and drying.

[0034] The present application uses distiller's grains biochar as the core substrate, uniformly coated with sodium alginate solution and cross-linked with calcium ions to form a stable three-dimensional network structure. It not only retains the high adsorption properties of distiller's grains biochar, but also enhances the selective capture capacity of the material to Fe 3+ through the ion exchange action of the calcium alginate gel layer.

[0035] The second object of the present application is to provide a method for treating intercooled water in multiple stages by bypass, comprising the following steps: The intercooled water to be treated is filtered through a manganese sand layer and a quartz sand layer in sequence to intercept iron oxide suspensions and perform deep filtration; The filtered intercooled water is introduced into a modified adsorption unit 2, and SO4 2- in the water is adsorbed by the coal gangue modified straw biochar material; Then it is introduced into a composite adsorption unit 3, and dissolved Fe 3+ is removed by specific chelation of the microencapsulated calcium alginate-distiller's grains biochar composite material.

[0036] The intercooled water is filtered through a manganese sand-quartz sand double-layer gradient, effectively intercepting iron oxide suspensions to avoid their deposition and under-deposit corrosion in the system; subsequently, the water flows through the modified adsorption unit 2, and the coal gangue modified straw biochar, with its optimized pore structure and surface properties, efficiently adsorbs SO4 2- , blocking its combination with Cl -The synergistic corrosion effect; finally, the calcium alginate-distillers' grains biochar composite material in composite adsorption unit 3 precisely removes dissolved Fe through chelation. 3+ This method eliminates the risk of corrosion to metal components by acting as an oxidant. Through multi-stage synergistic treatment, it significantly improves corrosion control efficiency without the need for complex chemical regeneration. Furthermore, it utilizes solid waste-based functional materials throughout the process, combining process simplicity with environmental friendliness, providing a reliable solution for the long-term stable operation of intercooled water systems.

[0037] For example, when the adsorption capacity of the modified adsorption unit 2 drops to 70%~75% of its initial value, backwashing regeneration is employed; the backwashing parameters are: a backwashing cycle of 24~48 hours and a backwashing intensity of 8~12 L / (m²). 2 •s); Coal gangue modified straw biochar material in adsorbing SO4 2- During the process, pollutants gradually clog the surface active sites and internal pore channels, leading to a decrease in adsorption efficiency. Backwashing regeneration generates moderate hydraulic shear force, effectively stripping the pollutant layer attached to the packing surface and flushing out the blockages in the pores, thus re-exposing the covered active sites and restoring their surface chemisorption activity.

[0038] When the adsorption capacity of composite adsorption unit 3 drops to 70%~75% of its initial value, it is regenerated by soaking in citric acid solution. The soaking parameters are: soaking in a 5% citric acid solution for 2~4 hours, followed by rinsing with water until the effluent is neutral. The calcium alginate-distillers' grains biochar composite material in chelating Fe... 3+ During the process, Fe 3+ It can form stable coordination bonds with active groups such as carboxyl groups on the surface of materials. The polycarboxyl structure of citric acid is utilized to... 3+ Stronger complexing ability, dissociating Fe bound to the material surface through competitive coordination. 3+ Rinsing with clean water can thoroughly remove the desorbed Fe. 3+ It also removes residual citric acid and restores the chelating ability of active sites on the material surface.

[0039] Example 1 Straw was crushed to 100 mesh and pyrolyzed at 600℃ under anaerobic conditions for 4 hours to obtain straw biochar. Coal gangue was pulverized, ball-milled for 3 hours to obtain powder, and then mixed with straw biochar at a mass ratio of 2:5. The mixture was then pyrolyzed at 600℃ under anaerobic conditions for 4 hours. After cooling, the mixture was soaked in a 1 mol / L dilute hydrochloric acid solution for 24 hours, washed until neutral, and then dried to obtain coal gangue-modified straw biochar material.

[0040] The distiller's grains are dried at 80°C, ground into 3mm pieces, pyrolyzed at 600°C under oxygen-free conditions for 4 hours to obtain distiller's grains biochar. A sodium alginate suspension with a mass concentration of 1.0% is mixed with the distiller's grains biochar at a mass ratio of 4:1, and is dropped into a 0.1mol / L calcium chloride solution at a rate of 10mL / min, and solidified for 10 hours. After salt water washing, the microencapsulated calcium alginate-distiller's grains biochar composite material is obtained through freezing and drying.

[0041] The upper layer of the gradient filtration unit 1 is filled with 1mm manganese sand filter material, and the lower layer is filled with 0.5mm quartz sand; the modified adsorption unit 2 is internally filled with coal gangue modified straw biochar material, and the composite adsorption unit 3 is internally filled with microencapsulated calcium alginate-distiller's grains biochar composite material.

[0042] The system of the present application is used to treat different pH (5, 7 and 9) of intercooling water, as shown in the table. Figures 2-3 As shown in the table, the removal rates of SO4 2- are 99.12%, 91.50% and 80.56% respectively, and the removal rates of Fe 3+ are 56.67%, 93.67% and 99.17% respectively. In summary, the device of the present application has a good treatment effect on intercooling water at different pH, and the treatment effect is more ideal at pH of 7 and 9.

[0043] Example 2 The straw is crushed to 80 mesh, pyrolyzed at 800°C under oxygen-free conditions for 2 hours to obtain straw biochar. The coal gangue is crushed, ball milled for 4 hours into powder, mixed with the straw biochar at a mass ratio of 2:5, and pyrolyzed at 800°C under oxygen-free conditions for 2 hours. After cooling, it is soaked in 1mol / L dilute hydrochloric acid solution for 48 hours, washed to neutral, and dried to obtain coal gangue modified straw biochar material.

[0044] The distiller's grains are dried at 60°C, ground into 1mm pieces, pyrolyzed at 300°C under oxygen-free conditions for 2 hours to obtain distiller's grains biochar. A sodium alginate suspension with a mass concentration of 1.5% is mixed with the distiller's grains biochar at a mass ratio of 3:1, and is dropped into a 0.1mol / L calcium chloride solution at a rate of 10mL / min, and solidified for 20 hours. After salt water washing, the calcium alginate-distiller's grains biochar composite material is obtained through freezing and drying.

[0045] The upper layer of the gradient filtration unit 1 is filled with 1mm manganese sand filter material, and the lower layer is filled with 0.5mm quartz sand; the modified adsorption unit 2 is internally filled with coal gangue modified straw biochar material, and the composite adsorption unit 3 is internally filled with microencapsulated calcium alginate-distiller's grains biochar composite material.

[0046] Example 3 The straw was crushed to 90 mesh, pyrolyzed at 700°C under anaerobic conditions for 3 hours to obtain straw biochar. The coal gangue was crushed and ball milled to powder for 2 hours, then mixed with straw biochar at a mass ratio of 2:5, pyrolyzed at 700°C under anaerobic conditions for 3 hours. After cooling, it was soaked in 1 mol / L dilute hydrochloric acid solution for 36 hours, washed to neutral and dried to obtain coal gangue modified straw biochar material.

[0047] The vinasse was dried at 70°C, ground into 5mm fragments, pyrolyzed at 300°C under anaerobic conditions for 2 hours to obtain vinasse biochar. A 0.5% mass concentration sodium alginate suspension was mixed with vinasse biochar at a mass ratio of 5:1, and dropped into a 0.1 mol / L calcium chloride solution at a rate of 10 mL / min, and solidified for 20 hours. After salt water washing, freezing and drying, a calcium alginate-vinasse biochar composite material was obtained.

[0048] The upper layer of the gradient filtration unit 1 was filled with 1mm manganese sand filter material, and the lower layer was filled with 0.5mm quartz sand; the modified adsorption unit 2 was internally filled with coal gangue modified straw biochar material, and the composite adsorption unit 3 was internally filled with microencapsulated calcium alginate-vinasse biochar composite material.

[0049] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A system for multi-stage bypass inter-cooling water coordination processing, characterized in that, It comprises gradient filtration unit (1), modified adsorption unit (2) and composite adsorption unit (3) connected in sequence; the bottom outlet of the gradient filtration unit (1) is connected with the bottom inlet of the modified adsorption unit (2); the top outlet of the modified adsorption unit (2) is connected with the top inlet of the composite adsorption unit (3); The gradient filtration unit (1) comprises manganese sand layer and quartz sand layer from top to bottom in sequence; the modified adsorption unit (2) is filled with coal gangue modified straw biochar material; the composite adsorption unit (3) is filled with microencapsulated calcium alginate-distiller's grains biochar composite material.

2. The system for inter-cooling water bypassing co-processing in multiple stages according to claim 1, characterized in that, The volume ratio of the manganese sand layer to the quartz sand layer is 1: (1.5-2.0).

3. The system for inter-cooling water bypassing co-processing in multiple stages according to claim 1, wherein, The particle size of the manganese sand layer is 1-2 mm; the particle size of the quartz sand layer is 0.5 mm.

4. The system for inter-cooling water bypassing co-processing in multiple stages according to claim 1, wherein, The preparation method of the coal gangue modified straw biochar material is as follows: The straw is crushed and pyrolyzed under anaerobic condition to obtain straw biochar; The coal gangue is crushed and ball milled to obtain coal gangue powder; The coal gangue powder and the straw biochar are mixed and pyrolyzed under anaerobic condition, and then the mixture is cooled, washed with acid, washed, and dried to obtain the coal gangue modified straw biochar material.

5. The system for multi-stage bypass inter-processing water coordination of claim 4, wherein, The mass ratio of the coal gangue powder to the straw biochar is 2:

5.

6. The system for multi-stage bypass inter-processing water coordination of claim 4, wherein, The acid washing method is as follows: the mixture is soaked in 1 mol / L dilute hydrochloric acid solution for 24-48 hours.

7. The system for multi-stage bypass inter-processing water coordination of claim 1, wherein, The preparation method of the microencapsulated calcium alginate-distiller's grains biochar composite material is as follows: The distiller's grains are dried and crushed, and then pyrolyzed under anaerobic condition to obtain distiller's grains biochar; The sodium alginate suspension and the distiller's grains biochar are mixed to obtain a mixed solution; the mixed solution is dropped into CaCl2 solution for solidification reaction, and then washed, frozen, and dried to obtain the microencapsulated calcium alginate-distiller's grains biochar composite material.

8. The system for multi-stage bypass inter-processing water coordination of claim 7, wherein, The mass concentration of the sodium alginate suspension is 0.5%-1.5%, and the mass ratio of the sodium alginate suspension to the distiller's grains biochar is (3-5):

1.

9. A method of multi-stage bypass inter-cooling water coordination, characterized in that, The system according to any one of claims 1-8, comprising the following steps: The water to be treated is filtered through the manganese sand layer and the quartz sand layer in sequence to intercept iron oxide suspensions and perform deep filtration; The filtered intercooling water is introduced into a modified adsorption unit (2), and SO4 in the water is adsorbed by the coal gangue modified straw biochar material in a directional manner 2- ; The composite adsorption unit (3) is reconnected, and the specific chelation of the microencapsulated calcium alginate-distiller's grains biochar composite material removes dissolved Fe 3+ .

10. The method of claim 9, wherein, When the adsorption capacity of the modified adsorption unit (2) decreases to 70% to 75% of the initial value, backwashing regeneration is adopted; the backwashing parameters are: the backwashing period is 24 to 48 hours, and the backwashing intensity is 8 to 12 L / (m 2 ·s). When the adsorption capacity of the composite adsorption unit (3) decreases to 70%-75% of the initial value, the unit is regenerated by soaking in citric acid solution; the soaking parameters are as follows: the unit is soaked in 5% citric acid solution for 2-4 hours, and then washed with water until the effluent is neutral.

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