Device for removing refractory organic matters in wastewater

Abstract

The invention belongs to the technical field of wastewater treatment devices, and particularly relates to a device for removing refractory organic matters in wastewater. According to the technical scheme, the device for removing the refractory organic matters in the wastewater comprises a water inlet adjusting unit, a liquid inlet pressurizing and scattering unit, a rectifying unit and an electro-catalysis core treatment unit which are sequentially arranged from bottom to top, an S-ZVI feed port, a wastewater feed port and an oxidant feed port are formed in the water inlet adjusting unit, and a water discharge port is formed in the electro-catalysis core treatment unit. The invention provides a device for efficiently removing refractory organic matters in wastewater through electro-catalysis reinforced sulfurized zero-valent iron.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment devices, and in particular relates to a device for removing refractory organic matter in wastewater. Background Art

[0002] The process and device of electrocatalytically enhanced zero-valent iron sulfide for removing refractory organic matter from high-fluorine and high-salt wastewater is mainly dedicated to solving the key technical bottlenecks in the field of deep treatment of industrial wastewater. In the wastewater produced by industries such as semiconductors, petrochemicals and pesticides, there are generally characteristics of fluoride ion concentrations of 500-2000 mg / L, conductivity of 20-50 mS / cm, COD concentrations of 1000-5000 mg / L, BOD concentrations of 500-1000 mg / L, and SS concentrations of 800-1000 mg / L. Such complex water quality conditions severely restrict the application of traditional treatment processes.

[0003] At present, mainstream technologies face many difficulties in treating this type of wastewater. Although the chemical precipitation method is easy to operate, it is not ideal for removing difficult-to-degrade organic matter, and it will produce a large amount of chemical sludge that requires secondary treatment. The traditional Fenton oxidation process requires the continuous addition of a large amount of hydrogen peroxide, which not only has high operating costs, but also significantly reduces the oxidation efficiency in a high-salt environment. The biological treatment process encounters dual inhibition from high salt and high fluoride ions, making it difficult to maintain microbial activity. Membrane separation technology requires frequent cleaning and replacement due to membrane fouling and scaling problems, resulting in excessively high operating and maintenance costs.

[0004] The closest zero-valent iron sulfide / hydrogen peroxide treatment system, although it improves the stability of zero-valent iron through sulfide modification, still fails to completely solve the problem of material deactivation under high-salt conditions, and the continuous increase in hydrogen peroxide greatly increases the operating cost. The technology is also relatively limited in its effect on the removal of fluoride ions and cannot meet the strict emission standards. At the same time, the control accuracy of the reaction process is insufficient, making it difficult to adapt to the fluctuations in the quality of the influent water.

[0005] In summary, the prior art has the following disadvantages:

[0006] First, the material has poor stability and short service life: In the existing technology, zero-valent iron is very easy to passivate and agglomerate under high salt conditions, resulting in a reduction in active sites and a rapid decrease in reaction efficiency. Although traditional surface modification methods can improve material stability to a certain extent, the effect is not ideal and the service life of the catalyst is generally short.

[0007] Second, the problem of low treatment efficiency and high energy consumption: When treating high-salt and high-fluoride wastewater, traditional Fenton oxidation, electrochemical oxidation and other processes often require the addition of a large amount of oxidant or the application of a higher voltage to achieve the ideal treatment effect, which not only has high energy consumption but also has low treatment efficiency.

[0008] Third, the problem of poor adaptability to water quality and weak anti-interference ability: the existing technology is very sensitive to fluctuations in influent water quality, especially under complex water quality conditions such as high salt and high fluoride, the treatment effect is often not stable enough.

[0009] Fourth, the problem of poor fluoride ion removal effect: The conventional process is generally not ideal for fluoride ion removal, especially in a high-salt environment, the fluoride ion removal rate is often difficult to meet emission standard requirements.

[0010] Fifth, the problem of complex process and low degree of automation: Traditional processes often require frequent adjustment of operating parameters, complex operations and low degree of automation. Summary of the invention

[0011] In order to solve the above problems existing in the prior art, the object of the present invention is to provide a device for efficiently removing refractory organic matter in wastewater by electrocatalytically enhancing zero-valent iron sulfide.

[0012] The technical solution adopted by the present invention is:

[0013] A device for removing refractory organic matter in wastewater comprises a water inlet regulating unit, a liquid inlet pressurizing and spreading unit, a rectifying unit and an electrocatalytic core treatment unit which are arranged in sequence from bottom to top; the water inlet regulating unit is provided with an S-ZVI feed port, a wastewater feed port and an oxidant feed port, and the electrocatalytic core treatment unit is provided with a drain port.

[0014] The present invention is committed to developing an integrated treatment process that can achieve efficient removal of refractory organic matter under high-salt and high-fluorine conditions, has good material stability, low operating costs, high intelligence, and has the function of waste gas resource utilization, so as to meet the increasingly stringent environmental protection requirements and economic needs in the field of industrial wastewater treatment. During wastewater treatment, nano S-ZVI material is added through the S-ZVI feed port, wastewater is added through the wastewater feed port, and oxidant is added through the oxidant feed port. The mixed liquid is sequentially treated by the water inlet regulating unit, the liquid inlet pressurization and spreading unit, the rectifier unit, and the electrocatalytic core treatment unit to effectively remove refractory organic matter in high-fluorine and high-salt wastewater.

[0015] The present invention successfully solves the problem of material stability through an innovative sulfurized modified zero-valent iron process + a new treatment device, thereby increasing the service life of the catalyst by more than 50% and significantly reducing operating costs.

[0016] The present invention organically combines zero-valent iron sulfide with electrocatalytic technology, and by optimizing the electrode structure and process parameters, it can achieve efficient removal of COD under conditions of relatively low energy consumption, and the treatment efficiency is improved by more than 30%.

[0017] Through innovative process design, the present invention enables the system to have a strong ability to resist shock loads. Even when the inlet water quality fluctuates greatly, it can still maintain a stable treatment effect, and all indicators of the effluent can stably meet the standards.

[0018] The present invention significantly improves the removal efficiency of fluoride ions through sulfurization modification and electrocatalytic strengthening, and the removal rate can reach more than 85%, which is much higher than the traditional process level.

[0019] As a preferred embodiment of the present invention, the water inlet regulating unit includes a water inlet regulating cylinder, which is connected to the lower side of the liquid inlet pressurizing and spreading unit, and the S-ZVI feed port, the wastewater feed port and the oxidant feed port are all connected to the water inlet regulating cylinder, and an ultrasonic disperser is installed in the water inlet regulating cylinder. The ultrasonic disperser can fully disperse and mix the S-ZVI, wastewater and oxidant added to the water inlet regulating cylinder.

[0020] As a preferred embodiment of the present invention, the liquid inlet pressurization and spreading unit includes a pressurization and spreading cylinder, which is connected between the water inlet regulating unit and the rectifier unit. A nozzle fixing plate is installed in the pressurization and spreading cylinder, and a pressurization impeller is rotatably connected to the lower side of the nozzle fixing plate. A plurality of oblique nozzles are arranged on the upper side of the nozzle fixing plate. The pressurization impeller rotates in a fixed direction to generate upward pressure on the wastewater; at the same time, it plays a role of further mixing. The liquid generates a swirl in the cavity through a plurality of oblique nozzles, so that the materials are more fully mixed and flow upward.

[0021] As a preferred solution of the present invention, the flow rates of the plurality of oblique nozzles decrease successively from the inner circle to the outer circle.

[0022] As a preferred embodiment of the present invention, the rectification unit includes a rectification cylinder, which is connected between the liquid inlet pressurization and spreading unit and the electrocatalytic core treatment unit. A water pipeline is provided in the middle of the overall cylinder, and a rectification spiral is arranged on the outer wall of the water pipeline. The number of rectification spiral layers is determined according to the average wastewater treatment flow rate, and the material is rectified by the rectification spirals with a determined number of layers. The edge flow rate and flow velocity are relatively large, while the middle flow rate and flow velocity are relatively small. By arranging a water pipeline in the middle, the middle part is directly connected to reduce the head loss in the middle part.

[0023] As a preferred embodiment of the present invention, the electrocatalytic core treatment unit comprises an electrocatalytic cylinder, a cathode is installed in the middle of the electrocatalytic cylinder, a drain port is arranged at the top of the cathode, and an anode assembly is arranged in the cathode outer shell.

[0024] The cathode liquid and anode components interact with each other to fully electrocatalytically treat the wastewater. The present invention organically combines sulfide zero-valent iron with electrocatalytic technology, and by optimizing the electrode structure and process parameters, it can achieve efficient removal of COD under low energy consumption conditions, and the treatment efficiency is improved by more than 30%. The present invention significantly improves the removal efficiency of fluoride ions through sulfidation modification and electrocatalytic enhancement, and the removal rate can reach more than 85%, which is much higher than the traditional process level.

[0025] As a preferred solution of the present invention, the anode assembly comprises two layers of anode plate brackets, an inner anode plate is mounted on the inner anode plate bracket, and an outer anode plate is mounted on the outer anode plate bracket.

[0026] As a preferred solution of the present invention, the upper section of the electrocatalytic cylinder is connected with a plurality of integrated water quality detection probes, which detect the pH, DO, temperature, etc. of the treated wastewater.

[0027] As a preferred solution of the present invention, the upper section of the electrocatalytic cylinder is connected with a plurality of temporary drain ports, which can discharge liquid when the flow rate is too large.

[0028] As a preferred embodiment of the present invention, a heating pipeline is wound around the outer wall of the electrocatalytic cylinder, the wastewater feed port is connected to the wastewater pipeline, and one end of the heating pipeline is connected to the wastewater pipeline. The electrocatalytic unit releases heat, which is used to heat the heating pipeline, so that the wastewater sent to the water inlet regulating unit is heated, thereby improving the wastewater treatment effect.

[0029] The beneficial effects of the present invention are:

[0030] 1. The water inlet regulating unit, liquid inlet pressurizing and spreading unit, rectifying unit and electrocatalytic core processing unit are sequentially arranged in the present invention. Through the innovative sulfurized modified zero-valent iron process + new processing device, the material stability problem is successfully solved, the service life of the catalyst is increased by more than 50%, and the operating cost is greatly reduced. The present invention innovatively designs a multi-stage composite exhaust gas treatment system, which not only realizes the efficient treatment of exhaust gas, but also reduces the treatment cost through resource utilization.

[0031] 2. The present invention adds nano S-ZVI material to the water inlet regulating unit, and electrocatalytically treats the wastewater through the electrocatalytic core treatment unit, organically combines sulfide zero-valent iron with electrocatalytic technology, and optimizes the electrode structure and process parameters to achieve efficient removal of COD under low energy consumption conditions, and the treatment efficiency is improved by more than 30%. The present invention significantly improves the removal efficiency of fluoride ions through sulfidation modification and electrocatalytic enhancement, and the removal rate can reach more than 85%, which is much higher than the traditional process level.

[0032] 3. The present invention is provided with a water inlet regulating unit, a liquid inlet pressurizing and spreading unit, and a rectifying unit. Through innovative process design, the system has a strong ability to resist shock loads. Even when the inlet water quality fluctuates greatly, it can still maintain a stable treatment effect, and various indicators of the effluent can stably meet the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic cross-sectional structural diagram of the first direction of the present invention;

[0034] Figure 2 is a schematic cross-sectional structural diagram of the second direction of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the water inlet regulating unit;

[0036] Figure 4 It is a schematic diagram of the structure of the liquid inlet pressurization and spreading unit in the first direction;

[0037] Figure 5 It is a schematic diagram of the structure of the second direction of the liquid inlet pressurization and spreading unit;

[0038] Figure 6 It is a cross-sectional structural diagram of the rectifier unit;

[0039] Figure 7 is a schematic diagram of the structure of the electrocatalytic core processing unit;

[0040] Figure 8 It is a schematic diagram of the structure of the cathode and anode components.

[0041] In the figure: 1-water inlet regulating unit; 2-liquid pressurization and spreading unit; 3-rectifier unit; 4-electrocatalytic core treatment unit; 11-water inlet regulating cylinder; 12-S-ZVI feed port; 13-wastewater feed port; 14-oxidant feed port; 15-wastewater pipeline; 16-ultrasonic disperser; 21-pressurization and spreading cylinder; 22-nozzle fixing plate; 23-pressurization impeller; 24-oblique nozzle; 31-rectifier cylinder; 32-water pipeline; 33-rectifier spiral; 41-electrocatalytic cylinder; 42-cathode; 43-drain outlet; 44-anode plate bracket; 45-inner anode plate; 46-outer anode plate; 47-integrated water quality detection probe; 48-temporary liquid discharge outlet; 49-heating pipeline. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0044] like Figure 1 and Figure 2 As shown, the device for removing difficult-to-degrade organic matter in wastewater of this embodiment includes a water inlet regulating unit 1, a liquid pressurizing and spreading unit 2, a rectifying unit 3 and an electrocatalytic core treatment unit 4 which are arranged in sequence from bottom to top; the water inlet regulating unit 1 is provided with an S-ZVI feed port 12, a wastewater feed port 13 and an oxidant feed port 14, and the electrocatalytic core treatment unit 4 is provided with a drain port 43.

[0045] The present invention is committed to developing an integrated treatment process that can achieve efficient removal of refractory organic matter under high-salt and high-fluorine conditions, has good material stability, low operating cost, high intelligence, and has the function of waste gas resource utilization, so as to meet the increasingly stringent environmental protection requirements and economic needs in the field of industrial wastewater treatment. During wastewater treatment, nano S-ZVI material is added through the S-ZVI feed port 12, wastewater is added through the wastewater feed port 13, and oxidant is added through the oxidant feed port 14. The mixed liquid is sequentially treated by the water inlet regulating unit 1, the liquid inlet pressurization and spreading unit 2, the rectification unit 3 and the electrocatalytic core treatment unit 4 to effectively remove refractory organic matter in high-fluorine and high-salt wastewater.

[0046] The present invention successfully solves the problem of material stability through an innovative sulfurized modified zero-valent iron process + a new treatment device, thereby increasing the service life of the catalyst by more than 50% and significantly reducing operating costs.

[0047] The present invention organically combines zero-valent iron sulfide with electrocatalytic technology, and by optimizing the electrode structure and process parameters, it can achieve efficient removal of COD under conditions of relatively low energy consumption, and the treatment efficiency is improved by more than 30%.

[0048] Through innovative process design, the present invention enables the system to have a strong ability to resist shock loads. Even when the inlet water quality fluctuates greatly, it can still maintain a stable treatment effect, and all indicators of the effluent can stably meet the standards.

[0049] The present invention significantly improves the removal efficiency of fluoride ions through sulfurization modification and electrocatalytic strengthening, and the removal rate can reach more than 85%, which is much higher than the traditional process level.

[0050] Specifically, Figure 3 As shown, the water inlet regulating unit 1 includes a water inlet regulating cylinder 11, which is connected to the lower side of the liquid inlet pressurizing and spreading unit 2, and the S-ZVI feed port 12, the wastewater feed port 13 and the oxidant feed port 14 are all connected to the water inlet regulating cylinder 11, the wastewater feed port 13 is connected to the wastewater pipeline 15, and an ultrasonic disperser 16 is installed in the water inlet regulating cylinder 11. The ultrasonic disperser 16 can fully disperse and mix the S-ZVI, wastewater and oxidant added to the water inlet regulating cylinder 11.

[0051] Among them, the nano-S-ZVI material is mixed in deionized water in advance to facilitate subsequent ultrasonic dispersion. The dosage is 2-5% of the wastewater COD. A step-by-step dosage strategy is recommended. Initial stage (0-30min): COD <2000mg / L: 2%; COD2000-3500mg / L: 2.5%; COD>3500mg / L: 3%. Intermediate stage (30-60min): adjust according to COD removal rate; removal rate <40%: increase 0.5%; removal rate >60%: reduce 0.3%. Late stage (>60min): maintain the minimum effective dose; monitor the COD change trend; it is recommended not to exceed 50% of the initial dosage.

[0052] Treated / untreated wastewater first passes through the electrocatalytic reaction zone, and after being appropriately heated, enters the water distribution zone through the wastewater feed port 13 .

[0053] The oxidant can be hydrogen peroxide, peroxymonosulfate, peroxydisulfate, periodate, etc., and HCl or NaOH is added according to the pH of the influent wastewater to keep the pH of the wastewater in the influent adjustment zone between 3 and 4.

[0054] Specifically, Figure 4 and Figure 5 As shown, the liquid inlet pressurizing and spreading unit 2 includes a pressurizing and spreading cylinder 21, which is connected between the water inlet regulating unit 1 and the rectifier unit 3. A nozzle fixing plate 22 is installed in the pressurizing and spreading cylinder 21, and a pressurizing impeller 23 is rotatably connected to the lower side of the nozzle fixing plate 22. A plurality of oblique nozzles 24 are arranged on the upper side of the nozzle fixing plate 22.

[0055] The pressurizing impeller 23 rotates in a fixed direction, generating upward pressure on the wastewater and further mixing the wastewater. The liquid generates a swirl in the cavity through a plurality of oblique nozzles 24, so that the materials are more fully mixed and flow upward.

[0056] The flow rates of the plurality of oblique nozzles 24 decrease from the inner circle to the outer circle. According to empirical parameters: the flow rate of the nozzles in the first circle is Q; the flow rate of the nozzles in the second circle is 1.05-1.1Q; the flow rate of the nozzles in the third circle is 1.2-1.4Q; and the flow rate of the nozzles in the fourth circle is 1.3-1.5Q.

[0057] Specifically, Figure 6 As shown, the rectifying unit 3 includes a rectifying cylinder 31, which is connected between the liquid inlet pressurization and spreading unit 2 and the electrocatalytic core treatment unit 4. A water pipeline 32 is arranged in the middle of the whole cylinder, and a rectifying spiral 33 is arranged on the outer wall of the water pipeline 32. According to the average treatment flow of the wastewater, the number of layers of the rectifying spiral 33 is determined according to the existing test data, and the materials are rectified by the rectifying spiral 33 with the determined number of layers. The edge flow and flow velocity are larger, while the middle flow and flow velocity are smaller. By arranging a water pipeline 32 in the middle, the middle is directly connected to reduce the head loss in the middle.

[0058] The optimization of the number of layers of the rectifying spiral 33 is determined based on the hydraulic retention time (HRT):

[0059] Less than 5m 3 / Daily processing volume:

[0060] 1st layer: HRT = 4 to 6 hours, suitable for low pollution;

[0061] Layer 2: HRT = 6 to 8 hours, suitable for moderate pollution;

[0062] Layer 3: HRT = 8 to 10 hours, suitable for high pollution.

[0063] 5~10m 3 / Daily processing volume:

[0064] 3rd layer: HRT = 3-4 hours, to ensure the basic treatment effect;

[0065] 4th layer: HRT = 4-5 hours, improving processing efficiency;

[0066] 5th layer: HRT = 5-6 hours, for treating difficult-to-degrade pollutants.

[0067] 10~20m 3 / Daily processing volume:

[0068] Level 6: HRT = 2.5 to 3 hours, meeting basic needs;

[0069] 7th layer: HRT = 3-4 hours, improving processing efficiency;

[0070] 8th layer: HRT = 4-5 hours, to ensure deep treatment.

[0071] Specifically, Figure 7 and Figure 8 As shown, the electrocatalytic core processing unit 4 includes an electrocatalytic cylinder 41, a cathode 42 is installed in the middle of the electrocatalytic cylinder 41, a drain port 43 is arranged at the top of the cathode 42, and an anode assembly is arranged on the outer shell of the cathode 42.

[0072] The cathode 42 is made of graphite material, has a millimeter-level pore size, and collects treated wastewater.

[0073] The current density of the anode assembly is 5-20 mA / cm 2 :

[0074] Segment settings according to different water quality conditions:

[0075] Low concentration pollutants (COD < 2000 mg / L): 5-8 mA / cm 2 : Avoid energy waste, reduce electrode loss, and be suitable for degradation of conventional pollutants.

[0076] Medium concentration (COD 2000~3500mg / L): 8~15mA / cm 2 : Provides sufficient oxidation capacity, maintains good current efficiency, and is suitable for most industrial wastewater.

[0077] High concentration pollutants (COD>3500mg / L): 15~20mA / cm 2 : Ensure sufficient oxidative degradation capacity, suitable for the treatment of difficult-to-degrade organic matter, and it is recommended to cooperate with temperature control (controlled at 35-40℃).

[0078] Specific selection basis: Conductivity: Every increase of 5mS / cm can reduce 2~3mA / cm 2 ; Fluoride ion concentration: For every 500mg / L increase, it is recommended to increase 2-3mA / cm 2 ; Water temperature: Every 5℃ increase can reduce 1~2mA / cm 2 .

[0079] The cathode 42 liquid and anode components interact with each other to fully electrocatalytically treat the wastewater. The present invention organically combines sulfide zero-valent iron with electrocatalytic technology, and by optimizing the electrode structure and process parameters, it can achieve efficient removal of COD under low energy consumption conditions, and the treatment efficiency is improved by more than 30%. The present invention significantly improves the removal efficiency of fluoride ions through sulfidation modification and electrocatalytic enhancement, and the removal rate can reach more than 85%, which is much higher than the traditional process level.

[0080] The anode assembly includes two layers of anode plate brackets 44, an inner layer anode plate 45 is mounted on the inner layer anode plate bracket 44, and an outer layer anode plate 46 is mounted on the outer layer anode plate bracket 44. The inner layer anode plate 45 is a titanium-based conductive material; the outer layer anode plate 46 is RuO2-IrO2 / Ti, a titanium-based conductive material. The outer layer anode plate 46 and the inner layer anode plate 45 are in an arc shape, and their angles can be adjusted.

[0081] The upper section of the electrocatalytic cylinder 41 is connected to two integrated water quality detection probes 47. The integrated water quality detection probes 47 detect the pH, DO, temperature, etc. of the treated wastewater. The upper section of the electrocatalytic cylinder 41 is connected to two temporary drain ports 48. The temporary drain ports 48 can discharge liquid when the flow rate is too large.

[0082] Furthermore, a heating pipe 49 is wound around the outer wall of the electrocatalytic cylinder 41, one end of which is connected to the wastewater pipe 15, and the heating pipe 49 has high thermal conductivity. The electrocatalytic unit releases heat, which is used to heat the heating pipe 49, so that the wastewater sent to the water inlet regulating unit 1 is heated, thereby improving the wastewater treatment effect.

[0083] Example 1 (low concentration pollutant treatment):

[0084] Influent water quality (sampling 3 times every 2 hours, taking the average value): COD: 1832±127mg / L; BOD: 587±43mg / L; fluoride ion: 778±65mg / L; conductivity: 24.7±1.8mS / cm; SS: 863±72mg / L; pH: 6.3~6.8

[0085] Operating parameters: S-ZVI dosage: 35.8±2.1mg / L; current density: 6.2±0.4mA / cm 2 ; Rectification unit 3: 2 layers; HRT: 5.8±0.3 hours; Temperature: 22~26℃.

[0086] Treatment effect (continuous operation for 72 hours, sampling every 8 hours): COD: 162±28mg / L (removal rate 91.2±1.8%); BOD: 35±5.2mg / L (removal rate 94.1±1.2%); fluoride ion: 101±12mg / L (removal rate 87.0±2.1%); SS: 42±6.8mg / L (removal rate 95.1±1.4%).

[0087] Example 2 (Medium Concentration Pollutant Treatment):

[0088] Influent water quality: COD: 3267±186mg / L; BOD: 812±58mg / L; Fluoride ion: 1478±112mg / L; Conductivity: 34.8±2.3mS / cm; SS: 938±81mg / L; pH: 7.0~7.5.

[0089] Operating parameters: S-ZVI dosage: 82.3±4.7mg / L; current density: 11.8±0.6mA / cm 2 ; Rectification unit 3: 4 layers; HRT: 4.6±0.2 hours; Temperature: 24~28℃.

[0090] Treatment effect: COD: 408±45mg / L (removal rate 87.5±2.2%); BOD: 89±11mg / L (removal rate 89.1±1.8%); fluoride ion: 238±26mg / L (removal rate 83.9±2.4%); SS: 62±8.9mg / L (removal rate 93.4±1.6%).

[0091] Example 3 (treatment of high concentration refractory pollutants):

[0092] Influent water quality: COD: 4756±243mg / L; BOD: 968±82mg / L; Fluoride ion: 1823±156mg / L; Conductivity: 44.3±3.1mS / cm; SS: 992±93mg / L; pH: 7.8~8.2.

[0093] Operating parameters: S-ZVI dosage: 142±7.8mg / L; current density: 17.6±0.9mA / cm 2 ; Rectification unit 3: 6 layers; HRT: 3.2±0.3 hours; Temperature: 37~39℃.

[0094] Treatment effect: COD: 747±68mg / L (removal rate 84.3±2.8%); BOD: 138±18.5mg / L (removal rate 85.7±2.3%); fluoride ion: 327±34mg / L (removal rate 82.1±2.7%); SS: 86±11.2mg / L (removal rate 91.3±1.9%).

[0095] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A device for removing refractory organic matter from wastewater, characterized in that: The invention comprises a water inlet regulating unit (1), a liquid inlet pressurizing and spreading unit (2), a rectifying unit (3) and an electrocatalytic core treatment unit (4) which are arranged in sequence from bottom to top; the water inlet regulating unit (1) is provided with an S-ZVI feed port (12), a wastewater feed port (13) and an oxidant feed port (14), and the electrocatalytic core treatment unit (4) is provided with a drain port (43).

2. The device for removing refractory organic matter from wastewater according to claim 1, characterized in that: The water inlet regulating unit (1) comprises a water inlet regulating cylinder (11), the water inlet regulating cylinder (11) is connected to the lower side of the liquid inlet pressurizing and spreading unit (2), the S-ZVI feed port (12), the wastewater feed port (13) and the oxidant feed port (14) are all connected to the water inlet regulating cylinder (11), and an ultrasonic disperser (16) is installed in the water inlet regulating cylinder (11).

3. The device for removing refractory organic matter in wastewater according to claim 1, characterized in that: The liquid inlet pressurizing and spreading unit (2) comprises a pressurizing and spreading cylinder (21), the pressurizing and spreading cylinder (21) is connected between the water inlet regulating unit (1) and the rectifying unit (3), a nozzle fixing plate (22) is installed in the pressurizing and spreading cylinder (21), a pressurizing impeller (23) is rotatably connected to the lower side of the nozzle fixing plate (22), and a plurality of oblique nozzles (24) are arranged on the upper side of the nozzle fixing plate (22).

4. The device for removing refractory organic matter in wastewater according to claim 3, characterized in that: The flow rates of the plurality of oblique nozzles (24) decrease in sequence from the inner circle to the outer circle.

5. The device for removing refractory organic matter in wastewater according to claim 1, characterized in that: The rectifying unit (3) comprises a rectifying cylinder (31), the rectifying cylinder (31) being connected between the liquid inlet pressurizing and spreading unit (2) and the electrocatalytic core processing unit (4), a water pipeline (32) being arranged in the middle of the whole cylinder, and a rectifying spiral (33) being arranged on the outer wall of the water pipeline (32).

6. The device for removing refractory organic matter in wastewater according to claim 1, characterized in that: The electrocatalytic core treatment unit (4) comprises an electrocatalytic cylinder (41), a cathode (42) is installed in the middle of the electrocatalytic cylinder (41), a drain port (43) is arranged at the top of the cathode (42), and an anode assembly is arranged on the outer shell of the cathode (42).

7. The device for removing refractory organic matter in wastewater according to claim 6, characterized in that: The anode assembly comprises two layers of anode plate brackets (44), an inner layer of anode plate bracket (44) is mounted on an inner layer of anode plate bracket (44), and an outer layer of anode plate (46) is mounted on an outer layer of anode plate bracket (44).

8. The device for removing refractory organic matter in wastewater according to claim 6, characterized in that: The upper section of the electrocatalytic cylinder (41) is connected to a plurality of integrated water quality detection probes (47).

9. The device for removing refractory organic matter in wastewater according to claim 6, characterized in that: The upper section of the electrocatalytic cylinder (41) is connected to a plurality of temporary liquid discharge ports (48).

10. The device for removing refractory organic matter in wastewater according to claim 6, characterized in that: A heating pipeline (49) is wound around the outer wall of the electrocatalytic cylinder (41), the wastewater feed port (13) is connected to the wastewater pipeline (15), and one end of the heating pipeline (49) is connected to the wastewater pipeline (15).

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