Electric flocculation system coupled with solid electrolyte and deep phosphorus removal method for phosphorus-containing wastewater
By introducing an adsorbent-type solid electrolyte layer into the electrocoagulation system, the ion conduction and mass transfer pathways were optimized, solving the problem of high power consumption in low-concentration phosphorus-containing water bodies and achieving low-cost and efficient phosphate removal.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SOUTHERN UNIVERSITY OF SCIENCE AND TECHNOLOGY
- Filing Date
- 2026-01-13
- Publication Date
- 2026-05-12
AI Technical Summary
Existing electrocoagulation systems consume a lot of electricity and anodes when treating water with low concentrations of phosphorus. Furthermore, the low conductivity of low-concentration water leads to high energy consumption in traditional electrocoagulation methods, making it difficult to efficiently remove phosphate.
An electrocoagulation system coupled with a solid electrolyte is employed, using an anion exchange resin with phosphorus adsorption capacity as the adsorbent-type solid electrolyte layer, which is coupled with the cathode of the electrocoagulation system. By introducing the adsorbent-type solid electrolyte layer, ion conduction is enhanced, the ion mass transfer path is optimized, and the local enrichment and rapid removal of phosphate are achieved.
It reduced system energy consumption, increased phosphate removal rate, reduced anode consumption and sludge production, and achieved efficient phosphorus removal in water with low phosphate concentration.
Smart Images
Figure CN122010251A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wastewater treatment technology, and in particular to an electrocoagulation system coupled with a solid electrolyte and a method for deep phosphorus removal from phosphorus-containing wastewater. Background Technology
[0002] Excessive phosphorus concentration is a major cause of eutrophication in water bodies, and various methods and technologies for removing phosphate from wastewater have been developed over the past few decades. However, these methods often face challenges of low efficiency and high input costs when dealing with wastewater containing low concentrations of phosphate.
[0003] Among these technologies, adsorption is best suited for treating low-concentration phosphorus wastewater due to its high treatment efficiency, selectively removing and recovering phosphorus from wastewater while reducing phosphorus concentration to extremely low levels. However, achieving this goal in practical applications requires the development of adsorbents with high capacity and a specific preference for phosphate. Furthermore, the complex operating procedures, high regeneration costs associated with alkaline desorbents, and the need for further treatment to recover phosphorus from alkaline desorbents limit the widespread application of this method.
[0004] Electrocoagulation, utilizing renewable electricity to achieve high phosphate removal efficiency, is considered a promising green strategy due to its ease of operation, adaptability, and environmental friendliness. Furthermore, the electrocoagulation process can simultaneously remove and recover phosphate without consuming any chemical reagents. Its working mechanism primarily relies on the oxidation of iron ions at the iron anode upon energization, followed by the removal of phosphate ions through co-precipitation or adsorption, thereby transferring phosphorus from the liquid phase to the solid phase. However, when treating low-concentration phosphorus-containing water bodies, such as eutrophic waters, the electrocoagulation process requires a long operating time to generate sufficient iron ions to further reduce the phosphate concentration. This results in extremely high power consumption and iron anode depletion, and the production of large amounts of sludge with very low phosphorus content, significantly limiting its application in treating low-concentration phosphorus-containing water bodies. Simultaneously, low-concentration natural water bodies often exhibit low conductivity, leading to the high energy consumption required for traditional electrocoagulation methods when treating such water bodies.
[0005] Therefore, existing technologies still need to be improved and developed. Summary of the Invention
[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide an electrocoagulation system coupled with a solid electrolyte and a method for deep phosphorus removal from phosphorus-containing wastewater, aiming to solve the problems of high power consumption and large anode consumption when the existing electrocoagulation system treats low-concentration phosphorus-containing water.
[0007] The technical solution of the present invention is as follows: An electrocoagulation system coupled with a solid electrolyte includes an anode and a cathode coupled with an adsorbent-type solid electrolyte layer; the adsorbent-type solid electrolyte layer is an anion exchange resin with phosphorus adsorption capacity; the electrocoagulation system is used for phosphorus-containing wastewater with a phosphorus concentration of less than 100 mg / L and / or a conductivity of less than 3000 μS / cm.
[0008] In the electrocoagulation system with coupled solid electrolyte, the anode and the cathode are spaced apart, and the adsorbent-type solid electrolyte layer is disposed on the side of the cathode closer to the anode.
[0009] In the electrocoagulation system with coupled solid electrolyte, the distance between the anode and the cathode is 0.1cm-10cm.
[0010] In the electrocoagulation system coupled with a solid electrolyte, the anion exchange resin is selected from one or more of IRA-402 resin, D-201 resin, A-107 resin, IRA-400 resin, IRA-900 resin, 201×7 resin, and RTA-200 resin.
[0011] In the electrocoagulation system coupled with a solid electrolyte, the anode is made of iron, aluminum, or an alloy of iron and aluminum; the cathode is made of titanium, an inert metal, or carbon cloth.
[0012] In the electrocoagulation system with coupled solid electrolyte, the thickness of the adsorbent-type solid electrolyte layer is 0.1cm-10cm.
[0013] A method for deep phosphorus removal from phosphorus-containing wastewater based on an electrocoagulation system coupled with a solid electrolyte, comprising the following steps; Provide phosphorus-containing wastewater; The anode and the cathode coupled with an adsorbent-type solid electrolyte layer are immersed in the phosphorus-containing wastewater; A constant current or constant voltage is applied to the anode and the cathode to complete the deep phosphorus removal of phosphorus-containing wastewater.
[0014] In the aforementioned deep phosphorus removal method for phosphorus-containing wastewater, the constant current is 0.01A-10A.
[0015] In the aforementioned deep phosphorus removal method for phosphorus-containing wastewater, the constant voltage is 1V-30V.
[0016] The method for deep phosphorus removal from phosphorus-containing wastewater, wherein the phosphorus concentration of the phosphorus-containing wastewater is less than 100 mg / L.
[0017] Beneficial Effects: This invention provides an electrocoagulation system coupled with a solid electrolyte and a method for deep phosphorus removal from phosphorus-containing wastewater. The electrocoagulation system includes an anode and a cathode coupled with an adsorbent-type solid electrolyte layer. The adsorbent-type solid electrolyte layer is an anion exchange resin with phosphorus adsorption capacity. The electrocoagulation system is used for phosphorus-containing wastewater with a phosphorus concentration below 100 mg / L and / or a conductivity less than 3000 μS / cm. This invention applies the solid electrolyte electrocoagulation system to phosphorus-containing wastewater with low phosphate concentrations. By fully utilizing the advantages and characteristics of the adsorbent-type solid electrolyte and the electrocoagulation system, phosphate enrichment can be achieved, thereby accelerating the phosphate removal rate. Furthermore, addressing the high energy consumption problem of ordinary electrocoagulation systems caused by the low conductivity of low-concentration phosphorus-containing wastewater, the solid electrolyte electrocoagulation system of this invention significantly reduces system energy consumption by introducing an adsorbent-type solid electrolyte layer to enhance ion conduction. Using anion exchange resin as an adsorbent-based solid electrolyte offers numerous ion exchange groups, excellent chemical stability, and strong mechanical properties. It can both conduct ions to promote electrochemical processes and enrich phosphate ions through ion exchange. By leveraging the adsorption properties of the adsorbent-based solid electrolyte layer for phosphate ions and coupling it with a cathode that generates a localized alkaline environment, localized enrichment of low-concentration phosphate ions in the reaction zone is achieved. This accelerates phosphorus removal efficiency, reduces anode consumption and sludge production, and simultaneously increases sludge phosphorus content. Furthermore, the adsorbent-based solid electrolyte layer optimizes the mass transfer path between electrodes, lowering the voltage required for the reaction and achieving lower energy consumption for phosphorus removal. Therefore, this electrocoagulation system coupled with a solid electrolyte can achieve efficient phosphorus removal from low-concentration phosphate water at a faster rate and lower cost. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of an electrocoagulation system coupled with a solid electrolyte according to the present invention; Figure 2 This is a schematic diagram of the process for a deep phosphorus removal method for phosphorus-containing wastewater based on an electrocoagulation system coupled with a solid electrolyte, according to the present invention. Figure 3 This is a comparison diagram of the phosphorus removal effects of the electrocoagulation system coupled with a solid electrolyte in Example 1 and the traditional electrocoagulation system; Figure 4 This is a graph showing the effect of phosphorus removal from river water using an electrocoagulation system coupled with a solid electrolyte in Example 2. Figure 5 This is a graph showing the effect of phosphorus removal from lake water using an electrocoagulation system coupled with a solid electrolyte in Example 3. Figure 6 This is a graph showing the effect of using an electrocoagulation system coupled with a solid electrolyte for phosphorus removal from seawater in Example 4. Figure 7 This is a graph showing the phosphorus removal effect in Example 5. Detailed Implementation
[0019] This invention provides an electrocoagulation system coupled with a solid electrolyte and a method for deep phosphorus removal from phosphorus-containing wastewater. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0020] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.
[0021] like Figure 1 As shown, the present invention provides an electrocoagulation system coupled with a solid electrolyte, including an anode 10 and a cathode 30 coupled with an adsorbent-type solid electrolyte layer 20; the adsorbent-type solid electrolyte layer 20 is an anion exchange resin with phosphorus adsorption capacity; the electrocoagulation system is used for phosphorus-containing wastewater with a phosphorus concentration of less than 100 mg / L and / or a conductivity of less than 3000 μS / cm.
[0022] In this embodiment, the solid electrolyte electrocoagulation system is used in phosphorus-containing wastewater with low phosphate concentration. By fully utilizing the advantages and characteristics of the adsorbent-type solid electrolyte and the electrocoagulation system, phosphate enrichment can be achieved, thereby accelerating the phosphate removal rate. Furthermore, addressing the high energy consumption problem of ordinary electrocoagulation systems caused by the low conductivity of low-concentration phosphorus-containing wastewater, the solid electrolyte electrocoagulation system of this invention significantly reduces system energy consumption by introducing an adsorbent-type solid electrolyte layer to enhance ion conduction. Using anion exchange resin as the adsorbent-type solid electrolyte, due to its abundant ion exchange groups, good chemical stability, and mechanical properties, it can both conduct ions to promote the electrochemical process and enrich phosphate ions through ion exchange. Utilizing the adsorption characteristics of the adsorbent-type solid electrolyte layer for phosphate ions, coupled with a cathode that can generate a localized alkaline environment, local enrichment of low-concentration phosphate ions in the reaction zone is achieved, thereby accelerating the phosphorus removal reaction efficiency, reducing anode consumption and sludge production, and increasing sludge phosphorus content. Simultaneously, the adsorbent-type solid electrolyte layer optimizes the mass transfer path of ions between electrodes, reducing the voltage required for the reaction and achieving a lower energy consumption phosphorus removal effect. Therefore, this electrocoagulation system coupled with a solid electrolyte can achieve efficient phosphorus removal from water with low phosphate concentrations at a faster speed and lower cost.
[0023] Specifically, this invention utilizes a combination of electrocoagulation and adsorption, employing anion exchange resin as an adsorbent-type solid electrolyte coupled to the cathode of the electrocoagulation system. By fully leveraging the resin's phosphorus adsorption properties and the cathode's alkali production characteristics, local enrichment of low-concentration phosphate ions is achieved. Furthermore, by combining the characteristic of the electrocoagulation system's anode generating ferrous ions as a flocculant, it facilitates the one-step in-situ efficient removal of low-concentration phosphate ions. Moreover, the anion exchange resin, as a solid electrolyte, optimizes the mass transfer path of ions between electrodes, significantly reducing the energy consumption required for the system to operate in water bodies with low conductivity, thus achieving efficient in-situ phosphorus removal.
[0024] In some embodiments, the anode and the cathode are spaced apart, and the adsorbent-type solid electrolyte layer is disposed on the cathode side closer to the anode. This structure can utilize the phosphorus adsorption characteristics of the anion exchange resin and the alkali production characteristics of the cathode to achieve local enrichment of low-concentration phosphate ions.
[0025] In some embodiments, the distance between the anode and the cathode is 0.1 cm to 10 cm. In practical applications, the distance between the anode and the cathode can be adjusted according to their sizes; the smaller the electrode spacing, the lower the energy consumption.
[0026] In a preferred embodiment, the distance between the anode and the cathode is 5 mm.
[0027] In some embodiments, the anion exchange resin is selected from, but not limited to, one or more of IRA-402 resin, D-201 resin, A-107 resin, IRA-400 resin, IRA-900 resin, 201×7 resin, and RTA-200 resin. The above-mentioned anion exchange resins have phosphorus adsorption capacity and possess abundant ion exchange groups, good chemical stability, and mechanical properties. They can both conduct ions to promote electrochemical processes and enrich phosphate ions through ion exchange.
[0028] In another embodiment, the anion exchange resin may be selected from various modified anion exchange resins that have been loaded with metal oxides or metal hydroxides. Preferably, the metal element is selected from, but is not limited to, at least one of iron, lanthanum, and zirconium.
[0029] In some embodiments, the anode is made of iron, aluminum, or various alloys of iron and aluminum; the cathode is made of titanium, inert metal, or carbon cloth. Utilizing the cations generated by the anode under constant pressure or constant current as a flocculant facilitates the one-step, in-situ, and efficient removal of phosphate ions. Furthermore, the cathode made of the aforementioned materials can generate a localized alkaline environment, which, after coupling with the adsorbent-type solid electrolyte layer, can achieve local enrichment of low-concentration phosphate ions in the reaction zone, thereby accelerating the phosphorus removal reaction rate, reducing anode consumption and sludge production, and increasing the phosphorus content of the sludge.
[0030] In some embodiments, the thickness of the adsorbent-type solid electrolyte layer is 0.1 cm to 10 cm. This thickness range allows for better adsorption of phosphate ions and stronger ion conductivity, promoting electrochemical processes and enriching phosphate ions through ion exchange.
[0031] In addition, such as Figure 2 As shown, the present invention also provides a method for deep phosphorus removal from phosphorus-containing wastewater based on an electrocoagulation system coupled with a solid electrolyte, comprising the following steps; Step S10: Provide phosphorus-containing wastewater; Step S20: Immerse the anode and the cathode coupled with the adsorbent-type solid electrolyte layer in the phosphorus-containing wastewater; Step S30: Apply a constant current or a constant voltage to the anode and the cathode to complete the deep phosphorus removal of phosphorus-containing wastewater.
[0032] In this embodiment, the electrocoagulation system coupled with the solid electrolyte, under constant current or constant pressure conditions, utilizes the adsorption characteristics of the adsorbent-type solid electrolyte layer for phosphate ions. Coupled with a cathode that generates a localized alkaline environment, it achieves local enrichment of low-concentration phosphate ions in the reaction zone, thereby accelerating the phosphorus removal reaction efficiency, reducing anode consumption and sludge production, and increasing the phosphorus content of the sludge. Simultaneously, the adsorbent-type solid electrolyte layer optimizes the mass transfer path of ions between electrodes, reducing the voltage required for the reaction and achieving a lower energy consumption phosphorus removal effect. Furthermore, this deep phosphorus removal method is highly scalable and can be applied on a large scale, and can be used in various scenarios such as lake water, river water, and seawater.
[0033] In some embodiments, the constant current is 0.01A-10A. Under constant current, this electrocoagulation system coupled with a solid electrolyte can achieve efficient phosphorus removal from water with low phosphate concentrations at a faster speed and lower cost.
[0034] In a preferred embodiment, the constant current is 0.05A.
[0035] In some embodiments, the constant voltage is 1V-30V. Under constant voltage, this electrocoagulation system coupled with a solid electrolyte can achieve efficient phosphorus removal from low-concentration phosphate water at a faster speed and lower cost.
[0036] In a preferred embodiment, the constant voltage is 5V.
[0037] In some embodiments, the phosphorus-containing wastewater can be of any concentration; preferably, the electrocoagulation system coupled with a solid electrolyte is suitable for phosphorus-containing wastewater with a phosphorus concentration of less than 100 mg / L.
[0038] In some embodiments, the electrocoagulation system coupled with a solid electrolyte and / or the deep phosphorus removal method for phosphorus-containing wastewater provided by the present invention can be used in decentralized scenarios, such as the treatment of pollution in rivers, lakes and seas; it can also be used in centralized scenarios such as phosphorus-contaminated soil or groundwater in phosphogypsum mines.
[0039] The following examples further illustrate the present invention in detail. It should also be understood that the following examples are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention.
[0040] Example 1 This embodiment compares the phosphorus removal efficiency of an electrocoagulation system coupled with a solid electrolyte with that of a traditional electrocoagulation system by preparing a phosphorus-containing solution with a concentration of 5 mg / L. The details are as follows: A phosphorus-containing solution with a concentration of 5 mg / L was prepared, and its conductivity was adjusted to approximately 600 μS / cm using NaCl. This solution was used to prepare low-concentration phosphorus-containing wastewater. Adjusting the conductivity to 600 μS / cm was to simulate the conductivity characteristics of naturally eutrophic water bodies.
[0041] Take 600 mL of the above-mentioned phosphorus-containing wastewater into a reaction vessel, use an iron sheet as the anode and a titanium sheet cathode coupled with 1 g of IRA-402 resin as the electrode, set the electrode spacing to 5 mm, and carry out the phosphorus removal reaction under a constant current of 0.05 A.
[0042] The results of phosphorus removal efficiency of the electrocoagulation system coupled with solid electrolyte and the traditional electrocoagulation system are as follows: Figure 3 As shown, due to the effect of IRA-402 resin as an adsorbent and solid electrolyte, the residual phosphorus concentration in the solution decreased to 0.06 mg / L after 24 min of reaction, the phosphorus removal rate reached 0.197 mg / (L·min), the energy consumption and iron consumption were only 0.0436 kWh / g P and 7.24 g / g P, respectively, and the phosphorus content in the generated sludge was as high as 77.40 mg / g.
[0043] Under the same reaction conditions, in electrocoagulation systems without resin as an adsorbent solid electrolyte (such as...) Figure 3 As shown in the figure, after 30 minutes of reaction, the remaining phosphorus concentration in the solution was 0.71 mg / L, the phosphorus removal rate was only 0.138 mg / (L·min), and the energy consumption and iron consumption reached 0.0710 kWh / g P and 9.99 g / g P, respectively. The phosphorus content in the generated sludge was only 47.91 mg / g. Furthermore, as the reaction continues, when the phosphorus concentration drops to the 0.1 mg / L phosphorus concentration specified in the Class II surface water environmental quality standard, the phosphorus removal rate will be even slower, the iron and energy consumption will be even higher, and the phosphorus content in the sludge will be even lower.
[0044] Example 2 This embodiment utilizes an electrocoagulation system coupled with a solid electrolyte to conduct an application experiment on river water, specifically including: 600 mL of river water was placed in a reaction vessel, and its phosphorus concentration was adjusted to 5.02 mg / L with NaH₂PO₄, resulting in a conductivity of 253 μS / cm. An iron sheet was used as the anode, and a titanium cathode coupled with 1 g of IRA-402 resin was used as the electrode, with an electrode spacing of 5 mm. The phosphorus removal reaction was carried out under a constant current of 0.05 A. The phosphorus removal effect data is shown in the figure below. Figure 4 As shown, after 24 min of reaction, the residual phosphorus concentration in the solution decreased to 0.02 mg / L, the phosphorus removal rate was 0.208 mg / (L·min), and the energy consumption per unit of phosphorus removal was 0.0695 kWh / g P.
[0045] Example 3 This embodiment utilizes an electrocoagulation system coupled with a solid electrolyte to conduct an application experiment on lake water, specifically including: 600 mL of lake water was placed in a reaction vessel, and its phosphorus concentration was adjusted to 4.95 mg / L with NaH₂PO₄, resulting in a conductivity of 167 μS / cm. An iron sheet was used as the anode, and a titanium cathode coupled with 1 g of IRA-402 resin was used as the electrode, with an electrode spacing of 5 mm. The phosphorus removal reaction was carried out under a constant current of 0.05 A. The phosphorus removal effect data is shown in the figure below. Figure 5 As shown, after 24 min of reaction, the residual phosphorus concentration in the solution decreased to 0.02 mg / L, the phosphorus removal rate was 0.205 mg / (L·min), and the energy consumption per unit of phosphorus removal was 0.0591 kWh / g P.
[0046] Example 4 This embodiment utilizes an electrocoagulation system coupled with a solid electrolyte to conduct an application experiment on seawater, specifically including: 600 mL of seawater was placed in a reaction vessel, and its phosphorus concentration was adjusted to 4.80 mg / L with NaH₂PO₄, resulting in a conductivity of 34.3 mS / cm. An iron sheet was used as the anode, and a titanium cathode coupled with 1 g of IRA-402 resin was used as the electrode, with an electrode spacing of 5 mm. The phosphorus removal reaction was carried out under a constant current of 0.05 A. The phosphorus removal effect data is shown in the figure below. Figure 6 As shown, after 24 min of reaction, the residual phosphorus concentration in the solution decreased to 0.02 mg / L, the phosphorus removal rate was 0.199 mg / (L·min), and the energy consumption per unit of phosphorus removal was 0.0114 kWh / g P.
[0047] Example 5 600 mL of phosphorus-containing wastewater with a phosphorus concentration of 4.83 mg / L and a conductivity of 600 μS / cm was placed in a reaction vessel. An iron sheet was used as the anode, and a titanium cathode coupled with 1 g of D-201 resin was used as the electrode, with an electrode spacing of 5 mm. The phosphorus removal reaction was carried out under a constant current of 0.05 A. The phosphorus removal effect data is shown in the figure below. Figure 7 As shown, after 30 minutes of reaction, the residual phosphorus concentration in the solution decreased to 0.07 mg / L, the phosphorus removal rate was 0.159 mg / (L·min), and the energy consumption per unit of phosphorus removal was 0.0462 kWh / gP.
[0048] In summary, this invention provides an electrocoagulation system coupled with a solid electrolyte and a method for deep phosphorus removal from phosphorus-containing wastewater. The electrocoagulation system coupled with a solid electrolyte includes an anode and a cathode coupled with an adsorbent-type solid electrolyte layer. The adsorbent-type solid electrolyte layer is an anion exchange resin with phosphorus adsorption capacity. The electrocoagulation system is used for phosphorus-containing wastewater with a phosphorus concentration below 100 mg / L and / or a conductivity less than 3000 μS / cm. This invention applies the solid electrolyte electrocoagulation system to phosphorus-containing wastewater with low phosphate concentrations. By fully utilizing the advantages and characteristics of the adsorbent-type solid electrolyte and the electrocoagulation system, phosphate enrichment can be achieved, thereby accelerating the phosphate removal rate. Furthermore, for the high energy consumption problem of ordinary electrocoagulation systems caused by the low conductivity of low-concentration phosphorus-containing wastewater, the solid electrolyte electrocoagulation system of this invention greatly reduces system energy consumption by introducing an adsorbent-type solid electrolyte layer to enhance ion conduction. Using anion exchange resin as an adsorbent-based solid electrolyte offers numerous ion exchange groups, excellent chemical stability, and strong mechanical properties. It can both conduct ions to promote electrochemical processes and enrich phosphate ions through ion exchange. By leveraging the adsorption properties of the adsorbent-based solid electrolyte layer for phosphate ions and coupling it with a cathode that generates a localized alkaline environment, localized enrichment of low-concentration phosphate ions in the reaction zone is achieved. This accelerates phosphorus removal efficiency, reduces anode consumption and sludge production, and simultaneously increases sludge phosphorus content. Furthermore, the adsorbent-based solid electrolyte layer optimizes the mass transfer path between electrodes, lowering the voltage required for the reaction and achieving lower energy consumption for phosphorus removal. Therefore, this electrocoagulation system coupled with a solid electrolyte can achieve efficient phosphorus removal from low-concentration phosphate water at a faster rate and lower cost.
[0049] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. An electrocoagulation system coupled with a solid electrolyte, characterized in that, The system includes an anode and a cathode coupled with an adsorbent-type solid electrolyte layer; the adsorbent-type solid electrolyte layer is an anion exchange resin with phosphorus adsorption capacity; the electrocoagulation system is used for phosphorus-containing wastewater with a phosphorus concentration of less than 100 mg / L and / or a conductivity of less than 3000 μS / cm.
2. The electrocoagulation system with coupled solid electrolyte according to claim 1, characterized in that, The anode and the cathode are spaced apart, and the adsorbent-type solid electrolyte layer is disposed on the side of the cathode closer to the anode.
3. The electrocoagulation system with coupled solid electrolyte according to claim 1, characterized in that, The distance between the anode and the cathode is 0.1cm-10cm.
4. The electrocoagulation system with coupled solid electrolyte according to claim 1, characterized in that, The anion exchange resin is selected from one or more of the following: IRA-402 resin, D-201 resin, A-107 resin, IRA-400 resin, IRA-900 resin, 201×7 resin, and RTA-200 resin.
5. The electrocoagulation system with coupled solid electrolyte according to claim 1, characterized in that, The anode is made of iron, aluminum, or an alloy of iron and aluminum; the cathode is made of titanium, an inert metal, or carbon cloth.
6. The electrocoagulation system with coupled solid electrolyte according to claim 1, characterized in that, The thickness of the adsorbent-type solid electrolyte layer is 0.1cm-10cm.
7. A method for deep phosphorus removal from phosphorus-containing wastewater based on an electrocoagulation system coupled with a solid electrolyte as described in any one of claims 1-6, characterized in that, Includes steps; Provide phosphorus-containing wastewater; The anode and the cathode coupled with an adsorbent-type solid electrolyte layer are immersed in the phosphorus-containing wastewater; A constant current or constant voltage is applied to the anode and the cathode to complete the deep phosphorus removal of phosphorus-containing wastewater.
8. The method for deep phosphorus removal from phosphorus-containing wastewater according to claim 7, characterized in that, The constant current is 0.01A-10A.
9. The method for deep phosphorus removal from phosphorus-containing wastewater according to claim 7, characterized in that, The constant voltage is 1V-30V.
10. The method for deep phosphorus removal from phosphorus-containing wastewater according to claim 7, characterized in that, The phosphorus concentration in the phosphorus-containing wastewater is less than 100 mg / L.