Treatment system and treatment method for denitrification embedding carrier and production wastewater

Abstract

The invention discloses a denitrification embedding carrier and a treatment system and a treatment method for production wastewater. The method comprises the following steps: conveying a carbon source and high-nitrate and high-surfactant fluorine chemical industry production wastewater to a denitrification reaction tank through a water inlet pump, and stirring and aerating a carrier in the denitrification reaction tank through an air-entrapping integrated stirring device; adjusting the operation condition of the denitrification reaction tank to enable the embedded carrier in the denitrification reaction tank to enter an activation period; after the activation of the embedded carrier is finished, increasing the water inlet amount conveyed by a water inlet pump, so that the embedded carrier in the denitrification reaction tank enters a domestication period; after the domestication of the embedding carrier is finished, the water inflow of a water inlet pump is increased, and the high-nitrate high-surfactant fluorine chemical industry production wastewater is treated; the system has the characteristics of efficient and stable denitrification, low effluent concentration and small occupied area.

Description

Technical Field

[0001] This invention relates to the field of biological denitrification treatment technology for industrial nitrogen-containing wastewater, and particularly to a denitrification encapsulation carrier and a treatment method and system for industrial wastewater, applicable to the treatment of high nitrate, high surfactant, fluorochemical production wastewater. Background Technology

[0002] In the production of fluorinated polymer material fluorinated ethylene propylene, a large amount of high nitrate nitrogen wastewater is generated during the washing and condensation processes. This type of wastewater is characterized by high nitrate nitrogen concentration, low biodegradability, and the presence of fluoride ions and high concentrations of surfactants. It exhibits typical characteristics of high toxicity, high salinity, and high intensity. The nitrate nitrogen concentration in this type of wastewater can reach 500–2000 mg / L, and some fluorinated additives, surfactants, and polymerization byproducts show certain biological toxicity, making it difficult for conventional activated sludge to maintain a stable microbial community structure.

[0003] Traditional denitrification methods typically rely on suspended activated sludge systems. However, under conditions of high nitrate shocks or the presence of toxic substances, problems such as denitrifying bacteria inactivation, shortened sludge age, and sludge disintegration can easily occur. Furthermore, suspended sludge is prone to biomass loss under high load conditions, leading to significant fluctuations in system nitrogen removal efficiency. On the other hand, high nitrate nitrogen wastewater requires higher COD / NO3 ratios. - Complete denitrification requires a C / N ratio, making traditional processes prohibitively expensive in terms of carbon source costs and resulting in poor economic efficiency. Therefore, existing technologies for treating high-nitrate, high-surfactant fluorinated ethylene propylene wastewater suffer from problems such as poor shock resistance, high carbon source consumption, low denitrification load, and insufficient system stability.

[0004] Therefore, there is an urgent need for a treatment method suitable for fluoride chemical production wastewater with high nitrate and high surfactant content, which can achieve rapid acclimatization, resistance to toxic shocks, high-load operation, and stable effluent compliance, in order to overcome the shortcomings of existing technologies and improve the reliability and economy of industrial wastewater denitrification projects. Summary of the Invention

[0005] The purpose of this invention is to provide a denitrification encapsulation carrier and a method and system for treating industrial wastewater, which can achieve efficient, reliable and low-cost treatment of high-nitrate and high-surfactant fluorinated chemical production wastewater.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0007] In a first aspect, the present invention provides a denitrification embedding carrier, wherein the denitrification embedding carrier is a polymer-based nano-activated carbon hydrogel particle containing denitrifying bacteria, comprising denitrifying bacteria content of 5 g to 20 g / kg particles, nano-activated carbon content of 100 g to 300 g / kg particles, and polymer prepolymer content of 50 g / kg particles.

[0008] The denitrification carrier in the above technical solution has a stable structure, large biomass, and tolerance to fluorine-containing additives. Compared with traditional activated sludge, it has stronger shock resistance and will not cause sludge to float or run away.

[0009] Because the denitrification carrier has a stable structure and high mechanical strength, it can be intercepted by a special interception device when treating wastewater from fluorine chemical production with high nitrate and high surfactant content. This completely separates the residence time and hydraulic residence time of the denitrification carrier, preventing biomass loss under high water load, thus achieving efficient denitrification.

[0010] The matrix of the denitrification embedding carrier is composed of a biocompatible hydrogel with abundant internal pores and a specific surface area as high as 35.6 m². 2 It has a high biomass loading capacity and high nitrogen removal capacity, and can still maintain 2~2.6 kg NO3 in highly toxic industrial nitrogen-containing wastewater. - -N / m 3 High denitrification load (d);

[0011] The high abundance of denitrifying bacteria enriched within the denitrification carrier can effectively improve carbon source utilization, reduce carbon source addition, and maintain the optimal C / N ratio at around 3-3.5, thereby reducing carbon source usage and lowering treatment costs.

[0012] Furthermore, the water content of the polymer-based nano-activated carbon hydrogel particles is 88wt%~89.5wt%.

[0013] Furthermore, the denitrification embedding carrier is a cuboid or cubic particle with a particle size of 1.5~5mm.

[0014] In the above technical solutions, using cuboid or cubic particles with a particle size of 1.5~5mm as the denitrification encapsulation carrier is more conducive to the rapid mass transfer and penetration of pollutants, thereby improving treatment efficiency.

[0015] Furthermore, the polymer prepolymer is a polymeric material that solidifies into a hydrogel solid under aqueous conditions by adding an initiator, including one or a combination of polyvinyl alcohol, polyacrylamide, or waterborne polyurethane prepolymers.

[0016] In the above technical solution, denitrifying bacteria are embedded and fixed by polymer prepolymer, and degassing is carried out by combining an integrated aeration and stirring device to avoid the floating and accumulation of the denitrification embedding carrier. The polymer material provided in the technical solution can form a hydrogel polymer network, which is low in cost and has good biocompatibility.

[0017] Secondly, the present invention provides a wastewater treatment system, including an inlet pump, a denitrification reactor, and an integrated aeration and stirring device.

[0018] The outlet of the water inlet pump is connected to the inlet of the denitrification reactor;

[0019] The denitrification reactor is provided with the denitrification encapsulation carrier described in any of the first aspects;

[0020] The integrated aeration and stirring device is used to stir and aerate the carrier in the denitrification reactor.

[0021] Optionally, the water pump includes a carbon source material tank and a water inlet tank, with the outlet of the carbon source material tank connected to the inlet of the water inlet tank.

[0022] Optionally, the processing system also includes an insulation system that is fitted onto the denitrification reactor.

[0023] Optionally, the processing system also includes a blower connected to the integrated aeration and mixing device.

[0024] Optionally, the processing system also includes a carrier interception device, which is installed at the discharge port of the denitrification reactor.

[0025] Thirdly, the present invention provides a method for treating industrial wastewater, based on the industrial wastewater treatment system of the second aspect, comprising the following steps:

[0026] According to the preset treatment conditions, the denitrification carrier in the denitrification reactor is stirred and aerated by an integrated aeration and stirring device;

[0027] The carbon source and high nitrate and high surfactant fluorochemical production wastewater are transported to the denitrification reactor by the influent pump at a preset low load. The operating conditions of the denitrification reactor are adjusted according to the preset activation conditions so that the denitrification carrier in the denitrification reactor enters the activation period.

[0028] After the denitrification carrier is activated, the water flow rate delivered by the influent pump is increased according to the preset medium load, so that the denitrification carrier in the denitrification reactor enters the acclimatization period.

[0029] After the denitrification and embedding carrier has been acclimated, the influent flow rate of the influent pump is increased to a preset high load to treat the wastewater from the fluorinated chemical production process with high nitrate and high surfactant content.

[0030] In the above technical solution, the denitrification reaction tank uses a denitrification encapsulation carrier as the denitrification biological carrier. The denitrification encapsulation carrier has a stable structure, large biomass, and is resistant to fluorine-containing additives. Compared with traditional activated sludge, it has stronger shock resistance and will not cause sludge to float or run away.

[0031] The integrated aeration and stirring device ensures that nitrogen generated during denitrification in the polymer-based nano-activated carbon hydrogel particles containing denitrifying bacteria is effectively removed during normal operation, preventing the particles from floating. Simultaneously, aeration within the integrated aeration and stirring device prevents the accumulation of surfactants and other pollutants in the denitrification carrier, thus avoiding performance degradation.

[0032] Because the denitrification carrier has a stable structure and high mechanical strength, it can be intercepted by a special carrier interception device, completely separating the sludge retention time and hydraulic retention time. This can prevent biomass loss under high water load, thereby achieving efficient denitrification.

[0033] The denitrification embedding carrier matrix is ​​composed of a biocompatible hydrogel with abundant internal pores and a specific surface area as high as 35.6 m². 2 It has a high biomass loading capacity and high nitrogen removal capacity, and can still maintain 2~2.6 kg NO3 in highly toxic industrial nitrogen-containing wastewater. - -N / m 3 ·d high denitrification load.

[0034] The high abundance of denitrifying bacteria in the carrier can effectively improve carbon source utilization and reduce carbon source addition. The optimal C / N ratio can be maintained at around 3 to 3.5, reducing carbon source usage and lowering treatment costs.

[0035] Optionally, the ratio of the carbon source to the high-nitrate, high-surfactant fluorochemical production wastewater is carbon / nitrogen = 3~4.

[0036] Furthermore, the preset low load is 0.56~0.58 kg NO3. - -N / m 3 ·d;

[0037] The preset medium load is 0.99~1.16 kg NO3. - -N / m 3 ·d;

[0038] The preset high load is 2~2.6 kg NO3. - -N / m 3 ·d.

[0039] In the above technical solution, the low, medium, and high load ranges are suitable loads for activating, acclimating, and treating high-nitrate, high-surfactant fluorine chemical production wastewater, as determined through testing. Low load is used to activate the denitrification carrier, avoiding the low treatment capacity of the unactivated denitrification carrier and its inability to fully utilize its performance. Medium load is used to gradually acclimate the denitrification carrier to the treatment state, enabling the treatment of large quantities of high-nitrate, high-surfactant fluorine chemical production wastewater under high load.

[0040] Furthermore, the preset treatment conditions are: stirring speed 20~25 rpm, aeration frequency 1~2 times / day, aeration duration 5~30min / time.

[0041] The above technical solution is based on experimental testing of the activated and domesticated denitrification carrier, and the suitable conditions for treating high-nitrate, high-surfactant fluorine chemical production wastewater. Under the above stirring speed, the high-nitrate, high-surfactant fluorine chemical production wastewater can fully contact the denitrification carrier. Aeration can prevent pollutants such as surfactants from accumulating in the denitrification carrier and causing performance degradation, so as to achieve continuous denitrification treatment of high-nitrate, high-surfactant fluorine chemical production wastewater. Under the above aeration frequency and time conditions, ideal results can be obtained, and continuous aeration can avoid wasting energy.

[0042] Furthermore, the preset activation conditions are: denitrification reactor temperature 25~35℃, denitrification reactor pH 7~9; hydraulic retention time 24~48h, aeration device not turned on, stirring speed 20~25 rpm.

[0043] The above scheme represents the suitable conditions for the treatment process of high-nitrate, high-surfactant fluorochemical production wastewater obtained through experimental testing. Under these conditions, the activation and acclimatization of the denitrification and encapsulation carrier can be completed quickly, achieving a high wastewater treatment capacity.

[0044] Optionally, the treatment method for wastewater from high nitrate and high surfactant fluorochemical production also includes adjusting the operating conditions of the denitrification reactor according to preset acclimation conditions when increasing the influent flow rate delivered by the influent pump according to preset medium load.

[0045] Optionally, the preset acclimatization conditions are: adjusting the hydraulic residence time to 12~48h.

[0046] In the above technical solution, the activated denitrification carrier has increased processing capacity, shortened residence time to save energy, and improved efficiency. The appropriate hydraulic residence time obtained through experimental testing can avoid overload and deactivation of the denitrification carrier.

[0047] Optionally, the treatment method for wastewater from high-nitrate, high-surfactant fluorochemical production also includes adjusting the operating conditions of the denitrification reactor according to preset denitrification conditions when increasing the influent flow rate of the influent pump at a preset high load.

[0048] Optionally, the preset denitrification condition is: adjusting the hydraulic retention time to 12~36h.

[0049] In the above technical solutions, the processing capacity of the domesticated denitrification and embedding carrier increases, the residence time is shortened to save energy, and the efficiency is improved.

[0050] Furthermore, the denitrification embedding carrier occupies 20% to 50% of the volume of the denitrification reactor.

[0051] The above scheme is the appropriate volume obtained from experimental testing for treating fluorinated chemical production wastewater with high nitrate and high surfactant content. It avoids the problems of incomplete treatment due to insufficient denitrification and embedding carrier, as well as waste due to excessive denitrification and embedding carrier.

[0052] Optionally, the nitrate nitrogen concentration of the high nitrate and high surfactant fluorochemical production wastewater is 900-1300 mg / L, the ammonia nitrogen concentration is 30-60 mg / L, the nitrite nitrogen concentration is 0-10 mg / L, the total nitrogen concentration is 900-1400 mg / L, the fluoride ion concentration is 50-140 mg / L, and the anionic surfactant concentration is 30-100 mg / L.

[0053] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0054] The denitrification reactor uses a denitrification encapsulation carrier as the denitrification biological carrier. The denitrification encapsulation carrier has a stable structure, large biomass, and is resistant to fluorine-containing additives. Compared with traditional activated sludge, it has stronger shock resistance and will not cause sludge to float or run away.

[0055] The integrated aeration and stirring device ensures that nitrogen generated during denitrification in the polymer-based nano-activated carbon hydrogel particles containing denitrifying bacteria is effectively removed during normal operation, preventing the particles from floating. Simultaneously, aeration within the integrated aeration and stirring device prevents the accumulation of surfactants and other pollutants in the denitrification carrier, thus avoiding performance degradation.

[0056] Because the denitrification carrier has a stable structure and high mechanical strength, it can be intercepted by a special carrier interception device, completely separating the sludge retention time and hydraulic retention time. This can prevent biomass loss under high water load, thereby achieving efficient denitrification.

[0057] The denitrification embedding carrier matrix is ​​composed of a biocompatible hydrogel with abundant internal pores and a specific surface area as high as 35.6 m². 2 It has a high biomass loading capacity and high nitrogen removal capacity, and can still maintain 2~2.6 kg NO3 in highly toxic industrial nitrogen-containing wastewater. - -N / m3 ·d high denitrification load.

[0058] The high abundance of denitrifying bacteria in the carrier can effectively improve carbon source utilization and reduce carbon source addition. The optimal C / N ratio can be maintained at around 3 to 3.5, reducing carbon source usage and lowering treatment costs. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 This is a schematic diagram of the structure of a treatment system according to some embodiments of a method for treating wastewater from fluorine chemical production with high nitrate and high surfactant content provided by the present invention.

[0061] Figure 2 This is a trend chart showing the nitrate nitrogen removal effect of some embodiments of a method for treating wastewater from fluorochemical production with high nitrate and high surfactant content, provided by the present invention.

[0062] Figure 3 These are electron microscope images of denitrification embedding carriers from some embodiments of a method for treating wastewater from high-nitrate, high-surfactant fluorochemical production provided by this invention.

[0063] Explanation of reference numerals in the attached figures:

[0064] 1. Water inlet tank; 2. Carbon source raw material tank; 3. Integrated aeration and stirring device; 4. Denitrification reaction tank; 5. Insulation system; 6. Carrier interception device; 7. Denitrification encapsulation carrier; 8. Fan. Detailed Implementation

[0065] The above content is further illustrated below with specific embodiments, but it should not be construed as limiting the scope of the invention to the following embodiments. All technologies implemented based on the above content of this invention fall within the scope of this invention.

[0066] It should be understood that all experimental procedures not detailed in the experiment are routine experimental procedures well known to those skilled in the art.

[0067] Example 1

[0068] This embodiment provides a denitrification embedding carrier for treating wastewater from fluoride chemical production with high nitrate and high surfactant content. The denitrification embedding carrier 7 is a polymer-based nano-activated carbon hydrogel particle containing denitrifying bacteria. Each kilogram of polymer-based nano-activated carbon hydrogel particle includes 10g of denitrifying bacteria, 200g of nano-activated carbon, and 150g of polymer prepolymer.

[0069] The water content of the polymer-based nano-activated carbon hydrogel particles is 89 wt%.

[0070] The denitrification carrier 7 is a cuboid or cubic particle with a particle size of 1.5~5mm.

[0071] In this embodiment, the polymer prepolymer is an aqueous polyurethane prepolymer. In other embodiments, the polymer prepolymer is polyvinyl alcohol or polyacrylamide.

[0072] The denitrification embedding carrier matrix is ​​composed of a biocompatible hydrogel with abundant internal pores and a specific surface area as high as 35.6 m². 2 / g.

[0073] Example 2

[0074] This embodiment provides a treatment system for wastewater from fluorinated chemical production with high nitrate and high surfactant content, such as... Figure 1 As shown, it includes an inlet pump, a denitrification reactor 4, and an integrated aeration and stirring device 3;

[0075] The outlet of the water inlet pump is connected to the inlet of the denitrification reactor 4;

[0076] The denitrification reaction vessel 4 is equipped with a denitrification embedding carrier 7 as described in Example 1;

[0077] The integrated aeration and stirring device 3 is used to stir and aerate the carrier in the denitrification reaction tank 4.

[0078] Example 3

[0079] This embodiment provides a treatment system for wastewater from fluorinated chemical production with high nitrate and high surfactant content, such as... Figure 1 As shown, it includes an inlet water tank 1, a carbon source raw material tank 2, an integrated aeration and stirring device 3, a denitrification reaction tank 4, a heat preservation system 5, a carrier interception device 6, a denitrification encapsulation carrier of Example 1 7, and a blower 8.

[0080] The outlet of the carbon source raw material tank 2 is connected to the inlet of the water inlet tank 1, and the outlet of the water inlet tank 1 is connected to the inlet of the denitrification reactor 4. The integrated aeration and stirring device 3 is installed above the denitrification reactor 4 and is used to stir and aerate the carrier in the denitrification reactor 4. The blower 8 is connected to the integrated aeration and stirring device 3. The heat preservation system 5 is sleeved on the outside of the denitrification reactor 4. The carrier interception device 6 is installed at the outlet of the denitrification reactor 4 and is used to separate the denitrification and embedding carrier 7 and the high nitrate and high surfactant fluorochemical production wastewater from the carbon source.

[0081] Example 4

[0082] This embodiment provides a treatment method for high-nitrate, high-surfactant fluorochemical production wastewater based on the treatment system of Embodiment 3, including the following steps:

[0083] The denitrification device is filled with a denitrification embedding carrier 7 at a volume ratio of 22%;

[0084] The carbon source is transported from the carbon source raw material tank 2 into the inlet water tank 1. The carbon source is a composite carbon source. The C / N ratio in the carbon source dosage refers to the C / N ratio in the inlet water. That is, based on the nitrogen content of the high nitrate and high surfactant fluorine chemical production wastewater in the inlet water, the C / N ratio of the carbon source and the high nitrate and high surfactant fluorine chemical production wastewater in the water tank is about 3.3. The production wastewater used in this embodiment is freshly discharged wastewater. The daily changes in the inlet water quality of the production wastewater will cause the C / N ratio of the inlet water to change, ranging from 3 to 3.5. The C / N ratio in the entire experimental process is about 3.3.

[0085] According to the preset treatment conditions, the denitrification carrier 7 in the denitrification reaction tank 4 is stirred and aerated by the integrated aeration and stirring device 3;

[0086] The carbon source and high nitrate and high surfactant fluorine chemical production wastewater are transported to the denitrification reactor 4 by the influent pump at a preset low load to activate the denitrification carrier 7. The operating conditions of the denitrification reactor 4 are adjusted according to the preset activation conditions so that the denitrification carrier 7 in the denitrification reactor 4 enters the activation period and fully restores the activity of denitrifying bacteria in the denitrification carrier 7.

[0087] After the denitrification carrier 7 is activated, that is, after the denitrification carrier 7 is restored to its activity, the water volume delivered by the influent pump is gradually increased according to the step load increase strategy to reach the preset medium load, so that the denitrification carrier 7 in the denitrification reaction tank 4 enters the acclimatization period, so as to acclimatize the denitrification carrier 7 and increase the denitrification treatment load.

[0088] After the denitrification carrier 7 has been acclimated, the influent flow rate of the influent pump is increased according to the preset high load to treat the high nitrate and high surfactant fluorine chemical production wastewater. This allows the denitrification reactor 4 to operate stably under high load conditions, enabling continuous denitrification treatment of the high nitrate and high surfactant fluorine chemical production wastewater, while ensuring that the effluent quality meets the drainage standards.

[0089] The preset treatment conditions are as follows: the stirring speed of the integrated aeration and stirring device 3 is 21 rpm, the blower 8 is started twice a day, and each start lasts for 5 minutes; the preset activation conditions are as follows: the temperature inside the denitrification reactor 4 is 30℃, the pH value inside the denitrification reactor 4 is 8, the hydraulic retention time (HRT) is 48h, and the blower 8 is turned off.

[0090] The average nitrate nitrogen concentration, average ammonia nitrogen concentration, average nitrite nitrogen concentration, average nitrite nitrogen concentration, average total nitrogen concentration, average fluoride ion concentration, average anionic surfactant concentration, and average anionic surfactant concentration of 61 mg / L are in the high nitrate and high surfactant fluoride chemical production wastewater introduced into the inlet water tank 1.

[0091] During activation, the nitrate nitrogen volumetric loading was low, ranging from 0.56 to 0.58 kg NO3. - -N / m 3 During the acclimatization period, the volumetric loading of nitrate nitrogen was a medium load of 0.99~1.16 kg NO3. - -N / m 3 ·d. After successful acclimatization, the denitrification load of denitrification reactor 4 is a high load of 2~2.6 kg NO3. - -N / m 3 ·d, due to slight differences in the quality of daily production wastewater, the actual nitrate nitrogen volumetric load during operation is within the range mentioned above.

[0092] The specific experimental procedure is as follows:

[0093] The effective volume is 1.6 m³. 3The denitrification reactor 4 is filled with denitrification carrier 7 at a volumetric filling rate of 22%, totaling 350L. Under continuous flow operation, the denitrification carrier 7 is activated in the denitrification reactor 4 with an initial residence time of 48 hours. The average nitrate nitrogen concentration, average ammonia nitrogen concentration, average nitrite nitrogen concentration, average total nitrogen concentration, average fluoride ion concentration, average anionic surfactant concentration, and average anionic surfactant concentration of 61mg / L in the high-nitrate, high-surfactant fluorochemical wastewater fed into the denitrification reactor 4 are 1247 mg / L, 56 mg / L, 2.9 mg / L, 1366 mg / L, 78 mg / L, and 0.57 kg NO3. - -N / m 3 •d, Select a composite carbon source as the carbon source, with an addition amount of C / N=3.3, and keep the stirring and degassing system continuously stirred at 21 rpm.

[0094] On the fourth day of operation, a significant amount of nitrate nitrogen was observed to be removed, with the nitrate nitrogen removal rate increasing from the initial 19.8% to 80.4%. This indicates that the denitrification carrier 7 has regained its activity. The trend of nitrate nitrogen removal effect is shown in the figure below. Figure 2 As shown; from day 5 to 9, the influent flow rate was further increased and the retention time shortened to 24 hours. Blower 8 was started twice a day for 5 minutes each time to further acclimate the denitrification carrier 7 to high-intensity wastewater, with an average nitrate nitrogen load of 1.1 kg NO3. - -N / m 3 On the first day of the load increase, the nitrate nitrogen removal rate was not affected by the load increase and remained at 76.1%. On the 9th day, the nitrate nitrogen removal rate increased to 96.3%.

[0095] On the 10th day of operation, the influent flow rate was further increased, shortening the retention time to 12 hours. Fan 8 was started twice daily for 5 minutes each time to meet design requirements. At this time, the average nitrogen load was 2.29 kg NO3. - -N / m 3 On day 1 after increasing the load, the nitrate nitrogen removal rate slightly decreased to 89.5%, but by day 14, it rapidly increased to 97.8%. In subsequent operations, the nitrate nitrogen load was maintained at 2–2.6 kg NO3. - -N / m 3 Between 1000 and 1000 days, the nitrate nitrogen removal rate was greater than 95%, and there was no significant accumulation of nitrite nitrogen.

[0096] Electron micrographs of the denitrification embedding carrier 7 at different stages in this embodiment are shown below. Figure 3 As shown, where, Figure 3 a is an electron microscope image of the surface of the denitrification embedding support 7 during the activation stage. Figure 3 b is an electron microscope image of the interior of the denitrification embedding carrier 7 during the activation stage. Figure 3 Electron micrograph of the interior of the denitrification embedding carrier 7 during the high-load stage. Figure 3 Image d shows an electron micrograph of the surface of the denitrification embedding carrier 7 during the high-load stage. As can be seen from the image, a large number of microorganisms were observed to colonize the surface and interior of the denitrification embedding carrier 7 during the high-load stage. The surface microorganisms are mainly short rod-shaped bacteria and are densely distributed. During the activation stage, the surface and interior microorganisms of the denitrification embedding carrier 7 are relatively sparse. It can be seen that the denitrification embedding carrier 7 after successful cultivation has a larger and denser microorganism content, thus effectively promoting the denitrification efficiency.

[0097] Figure 3 In the diagram, EHT is the accelerating voltage, WD is the working distance, Mag is the magnification, Signal A=InLens is the In-Lens detector selected for generating the electron microscope image, Aperture Size is the aperture size, and Date is the date the electron microscope image was generated.

[0098] The above experimental results show that the treatment method for high nitrate and high surfactant fluorochemical production wastewater of the present invention maintains a nitrate nitrogen removal rate of ≥95% under high load conditions.

[0099] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0100] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A denitrification embedding carrier, characterized in that, The denitrification embedding carrier (7) is a polymer-based nano-activated carbon hydrogel particle containing denitrifying bacteria. Each kilogram of polymer-based nano-activated carbon hydrogel particle includes 5g~20g of denitrifying bacteria, 100g~300g of nano-activated carbon, and 50~200g of polymer prepolymer.

2. The denitrification embedding carrier according to claim 1, characterized in that, The water content of the polymer-based nano-activated carbon hydrogel particles is 88wt%~89.5wt%.

3. The denitrification embedding carrier according to claim 1, characterized in that, The denitrification embedding carrier (7) is a cuboid or cubic particle with a particle size of 1.5~5mm.

4. The denitrification embedding carrier according to claim 1, characterized in that, The polymer prepolymer is a polymeric material that solidifies into a hydrogel solid under aqueous conditions by adding an initiator, including one or a combination of polyvinyl alcohol, polyacrylamide, and waterborne polyurethane prepolymers.

5. A wastewater treatment system, characterized in that, It includes an inlet pump, a denitrification reactor (4), and an integrated aeration and stirring device (3). The outlet of the water pump is connected to the inlet of the denitrification reactor (4); The denitrification reactor (4) is provided with a denitrification encapsulation carrier (7) as described in any one of claims 1-4. The integrated aeration and stirring device (3) is used to stir and aerate the carrier in the denitrification reaction tank (4).

6. A method for treating industrial wastewater, based on the industrial wastewater treatment system of claim 5, characterized in that, Includes the following steps: According to the preset treatment conditions, the denitrification carrier (7) in the denitrification reaction tank (4) is stirred and aerated by the integrated aeration and stirring device (3); The carbon source and high nitrate and high surfactant fluorine chemical production wastewater are transported to the denitrification reactor (4) by the influent pump at a preset low load. The operating conditions of the denitrification reactor (4) are adjusted according to the preset activation conditions so that the denitrification carrier (7) in the denitrification reactor (4) enters the activation period. After the denitrification carrier (7) is activated, the water flow rate delivered by the inlet pump is increased according to the preset medium load, so that the denitrification carrier (7) in the denitrification reaction tank (4) enters the acclimatization period; After the denitrification and embedding carrier (7) has been acclimated, the water inlet pump is increased according to the preset high load to treat the wastewater from the high nitrate and high surfactant fluorine chemical production.

7. The method for treating production wastewater according to claim 6, characterized in that, The preset low load is 0.56~0.58 kg NO3. - -N / m 3 ·d; The preset medium load is 0.99~1.16 kg NO3. - -N / m 3 ·d; The preset high load is 2~2.6 kg NO3. - -N / m 3 ·d.

8. The method for treating production wastewater according to claim 6, characterized in that, The preset treatment conditions are: stirring speed 20~25 rpm, aeration frequency 1~2 times / day, aeration duration 5~30min / time.

9. The method for treating production wastewater according to claim 6, characterized in that, The preset activation conditions are: the temperature of the denitrification reactor (4) is 25~35℃, the pH value inside the denitrification reactor (4) is 7~9; the hydraulic retention time is 24~48h, the aeration device is not turned on, and the stirring speed is 20~25 rpm.

10. The method for treating production wastewater according to claim 6, characterized in that, The denitrification carrier (7) occupies 20% to 50% of the volume of the denitrification reactor (4).

Images