Anaerobic ammonia oxidation rapid start-up system and method based on composite pvdc network filler

Abstract

The application relates to the sewage treatment technical field and discloses an anaerobic ammonia oxidation rapid starting system and method based on a composite PVDC net-shaped filler, wherein the PVDC net-shaped filler is modified by liquid sulfur spraying coupling with pyrrhotite powder; the composite PVDC net-shaped filler is loaded on a biological rotating disc and is further applied to the anaerobic ammonia oxidation rapid starting system, so that the sulfur autotrophic short-cut denitrification and the anaerobic ammonia oxidation are synergized, the starting period is greatly shortened, the ammonia nitrogen removal rate is improved, and the method is suitable for the advanced treatment and standard upgrading and reconstruction of low carbon-nitrogen ratio sewage.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, specifically to a rapid start-up system and method for anaerobic ammonia oxidation based on composite PVDC mesh packing. Background Technology

[0002] Against the backdrop of escalating global eutrophication, anaerobic ammonia oxidation technology has emerged as a potential technology for treating high ammonia nitrogen wastewater due to its advantages such as no need for external organic carbon sources, low energy consumption, and low sludge production. However, the slow growth and environmental sensitivity of anaerobic ammonia oxidizing bacteria result in reactor start-up cycles that can last for several months, limiting the technology's widespread adoption.

[0003] In recent years, researchers have accelerated the start-up process by optimizing reactor configuration, introducing functionalized biological packing materials, or adding chemical promoters. Among these methods, biological packing materials, as carriers for microbial attachment, directly affect the enrichment efficiency of anaerobic ammonia-oxidizing bacteria due to their surface properties. Existing start-up methods suffer from problems such as small specific surface area, low mass transfer efficiency, and surface properties unfavorable for bacterial attachment and enrichment. Furthermore, solid sulfur, when used as a sulfur source, dissolves slowly and is unevenly distributed, easily causing local inhibition or nutrient deficiency.

[0004] Chinese patent application CN115557606A discloses a coupled nitrogen removal method of sulfur autotrophic denitrification and anaerobic ammonia oxidation, using a mixed flocculent sludge of sulfur autotrophic denitrification and anaerobic ammonia oxidation as inoculum sludge, with a mass ratio of 1:1 to 1:4, and using sulfur-containing... 2- NO3 - and NH4 + The wastewater is the influent, and the wastewater contains sulfur (S). 2- NO3 - and NH4 + The molar ratio of hydroxylamine hydrochloride to sulfuric acid is (0.8–2.2):(0.8–1.2):(0.3–0.8). Hydroxylamine hydrochloride is simultaneously added to the wastewater, with the dosage based on the ratio of hydroxylamine hydrochloride to sulfuric acid. 2- With a mass ratio of 1:30 to 1:40, the anaerobic reactor was started. The addition of hydroxylamine hydrochloride promoted the expression of the SQR and NapA genes in sulfur-autotrophic denitrifying bacteria, as well as the HDH activity of anaerobic ammonia oxidizing bacteria. This significantly increased the activity of anaerobic ammonia oxidizing bacteria under the influence of sulfides, and also improved the accumulation rate of nitrite and elemental sulfur in the sulfur-autotrophic denitrification process, promoting their synergistic effect. This resulted in a shorter start-up time, more stable operation, and higher total nitrogen removal and elemental sulfur accumulation rates in the coupled system. However, the technical solution in this application mainly enhances the sulfur-autotrophic denitrification process through hydroxylamine hydrochloride, and it still fails to effectively solve the problems of small specific surface area, low mass transfer efficiency, and unfavorable surface properties for bacterial attachment and enrichment in traditional packing materials.

[0005] Therefore, it is urgent to develop a novel composite packing system that combines efficient microbial enrichment capacity with sulfur metabolism regulation function, and to establish an anaerobic ammonia oxidation rapid start-up system based on this. Summary of the Invention

[0006] In summary, this application aims to provide a rapid start-up system and method for anaerobic ammonia oxidation based on composite PVDC mesh packing. The PVDC mesh packing is modified by coupling liquid sulfur spray with pyrrhotite powder; the composite PVDC mesh packing is then loaded onto a biological rotating disc and further applied to the rapid start-up system for anaerobic ammonia oxidation, thereby achieving a synergistic effect of sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation, significantly shortening the start-up cycle, improving ammonia nitrogen removal rate, and making it suitable for advanced treatment and upgrading of low C / N ratio wastewater.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] In a first aspect, this application provides a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, comprising a denitrification tank and a biological rotating disc placed in the denitrification tank, wherein the biological rotating disc is loaded with composite PVDC mesh packing, the composite PVDC mesh packing being prepared by a packing composite device, the packing composite device comprising a temperature control unit, an atomizing nozzle, and a rapid cooling unit; the method for preparing the composite PVDC mesh packing includes:

[0009] Solid sulfur particles are heated under the action of a temperature control unit and turn into liquid sulfur;

[0010] Liquid sulfur is sprayed onto the modified PVDC mesh filler through an atomizing nozzle to form a porous sulfur layer, while pyrrhotite powder is added to the modified PVDC mesh filler at the same time.

[0011] After spraying, the modified PVDC mesh filler is cooled to room temperature by a rapid cooling unit, thus obtaining the composite PVDC mesh filler.

[0012] Secondly, this application provides a rapid start-up method for anaerobic ammonia oxidation, implemented through a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, comprising the following steps:

[0013] Activated sludge containing anaerobic ammonia oxidizing bacteria is inoculated into a biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0014] Place the inoculated biological rotating disc into the denitrification tank;

[0015] Start the biological rotating disc after inoculation and control the disc speed, dissolved oxygen concentration and temperature in the denitrification tank;

[0016] The wastewater to be treated is introduced, and the performance indicators before and after wastewater treatment are monitored and reported.

[0017] Compared with the prior art, the beneficial effects of this application include:

[0018] 1. Significantly shortens the start-up cycle and improves nitrogen removal performance.

[0019] Traditional anaerobic ammonia oxidation processes require 60–90 days to enrich microbial strains. This application achieves efficient coupling of sulfur autotrophic short-cut denitrification and anaerobic ammonia oxidation through precise loading of liquid sulfur and enhancement with pyrrhotite, shortening the start-up cycle to less than 15 days and significantly improving engineering application efficiency. Furthermore, during steady-state operation, ammonia nitrogen (NH4+) is reduced. + Removal rate of -N) > 98%, nitrate (NO3) - Nitrogen removal rate > 93%, suitable for efficient denitrification treatment of wastewater.

[0020] 2. Improve sulfur source utilization and inhibit caking

[0021] Liquid sulfur is atomized and sprayed at 120-158℃ and rapidly cooled to form a porous sulfur layer on the PVDC mesh filler, which greatly increases the specific surface area of ​​the resulting composite PVDC mesh filler, which is conducive to the attachment and enrichment of microorganisms. Moreover, it makes the sulfur release rate controllable and avoids the problem of easy caking of traditional sulfur particles, ensuring a stable supply of nitrite.

[0022] 3. Inhibits sulfate formation and improves effluent quality.

[0023] Pyrrhotite powder incorporated into the PVDC mesh filler can act as an electron mediator, through Fe... 3+ / Fe 2+ The activity of sulfate-reducing bacteria is inhibited in a cyclic manner, thereby controlling the sulfate (SO42-) concentration to <250mg / L and reducing the negative impact on the quality of the effluent.

[0024] 4. Enhanced biofilm adhesion and low-temperature adaptability, stable operation and convenient maintenance.

[0025] After being modified with pyrrhotite, the biofilm adhesion of PVDC packing material is improved. Combined with the dynamic biofilm formation on the biological rotating disc, stable operation at low temperature is achieved. Furthermore, the backwashing cycle of the biological rotating disc in this application can be extended to 60 days, reducing operation and maintenance costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the packing composite device.

[0027] Figure 2 This is a physical image of the composite PVDC mesh filler. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the application will be further described in detail below with reference to embodiments. However, this should not be construed as limiting the scope of this application to the following examples. All other embodiments obtained by those skilled in the art without creative effort without departing from the above-described methodological spirit of this application are within the scope of protection of this application.

[0029] In this application, the terminology used is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0031] Furthermore, the singular forms “for,” “or,” “a,” “any,” and “the” used in this application and the appended claims are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] In a first aspect, this application provides a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, comprising a denitrification tank and a biological rotating disc placed in the denitrification tank, wherein the biological rotating disc is loaded with composite PVDC mesh packing, and the composite PVDC mesh packing is subjected to... Figure 1 The prepared filler composite device shown includes a temperature control unit 1, an atomizing nozzle 2, and a rapid cooling unit 3; the preparation method of the composite PVDC mesh filler includes:

[0033] Solid sulfur particles 4 are heated under the action of temperature control unit 1 and become liquid sulfur 5;

[0034] Liquid sulfur 5 is sprayed onto the modified PVDC mesh filler 7 through the atomizing nozzle 2 to form a porous sulfur layer, while pyrrhotite powder 6 is added to the modified PVDC mesh filler 7 at the same time.

[0035] After spraying, the modified PVDC mesh filler 7 is cooled to room temperature by the rapid cooling unit 3, thus obtaining the composite PVDC mesh filler.

[0036] In one possible implementation, the temperature of the liquid sulfur 5 is controlled between 120 and 158°C. Maintaining the temperature above 120°C ensures complete liquefaction of the sulfur, preventing partial solidification due to excessively low temperatures, which could lead to pipe blockage or uneven spraying. Keeping the temperature below 158°C prevents the sulfur from reacting at excessively high temperatures to generate harmful byproducts, ensuring the purity of the material. Furthermore, within this temperature range, the viscosity of the liquid sulfur 5 is suitable (minimum viscosity range: 0.1–0.5 Pa·s), avoiding both excessively high viscosity causing nozzle blockage or atomization difficulties, and excessively low viscosity leading to rapid droplet dispersion and increased control difficulty.

[0037] In one possible implementation, the amount of liquid sulfur 5 sprayed is 2 to 8% of the total mass of the modified PVDC mesh filler 7.

[0038] In one possible implementation, the modified PVDC mesh filler 7 is obtained by soaking PVDC mesh filler in an acidic potassium permanganate solution and then spraying the surface with silane coupling agent KH-580; the concentration of the acidic potassium permanganate solution is 0.1 mol / L; and the amount of silane coupling agent KH-580 is 2-4% of the total mass of the PVDC mesh filler. After soaking in the acidic potassium permanganate solution, hydroxyl groups are generated on the surface of the PVDC mesh filler, which allows it to react more smoothly with the silane coupling agent KH-580, achieving the effect of surface modification of the PVDC mesh filler. Ultimately, liquid sulfur can be chemically bonded to the hydroxyl groups generated on the PVDC mesh filler through the mercapto groups in the silane coupling agent KH-580, and the tightness of the bond is much higher than that of ordinary physical coating or filling.

[0039] In one possible implementation, the atomizing nozzle 2 has an aperture size of 50–100 μm. This aperture range of the atomizing nozzle 2 is compatible with the liquid sulfur 5 in the aforementioned temperature range, allowing for the spraying of smaller sulfur droplets without clogging. It also has a larger specific surface area, which accelerates mass / heat transfer efficiency and facilitates chemical reactions or cooling and solidification.

[0040] In one possible implementation, the thickness of the porous sulfur layer is 50–200 μm; the porosity of the porous sulfur layer is 30–40%.

[0041] In one possible implementation, the pyrrhotite powder 6 has a mesh size of 200 mesh; the mass of the pyrrhotite powder 6 is 5-10% of the total mass of the modified PVDC mesh filler 7. The 200-mesh pyrrhotite powder 6 has a larger specific surface area, enabling it to fully contact the sulfur layer and microorganisms, significantly enhancing electron transfer capability; the 5%-10% proportion provides sufficient electron transfer capability while avoiding a decrease in filler porosity due to excessive addition; furthermore, selecting a 200-mesh particle size and a 5%-10% proportion avoids material waste and reduces filler preparation costs while ensuring functionality.

[0042] In one possible implementation, the cooling rate of the sprayed modified PVDC mesh filler 7 is ≥20℃ / s. Rapid cooling can disrupt the orderly arrangement of sulfur molecules during the slow solidification process, preventing them from forming a dense crystalline structure, thereby avoiding the caking problem caused by slow cooling of traditional sulfur particles.

[0043] Secondly, this application provides a rapid start-up method for anaerobic ammonia oxidation, implemented through a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, comprising the following steps:

[0044] Activated sludge containing anaerobic ammonia oxidizing bacteria is inoculated into a biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0045] Place the inoculated biological rotating disc into the denitrification tank;

[0046] Start the biological rotating disc after inoculation and control the disc speed, dissolved oxygen concentration and temperature in the denitrification tank;

[0047] The wastewater to be treated is introduced, and the performance indicators before and after wastewater treatment are monitored and reported.

[0048] In one possible implementation, the biofilm adheres to the packing material at a concentration ≥15 g / L; and the relative abundance of anaerobic ammonia-oxidizing bacteria on the biofilm is >40%.

[0049] In one possible implementation, the inoculated biological rotating disc has a water depth coverage of 70%-80% in the nitrification tank; the rotation speed of the inoculated biological rotating disc is 1-3 r / min.

[0050] In one possible implementation, the dissolved oxygen concentration in the denitrification tank is controlled at 0.2–0.5 mg / L; and the temperature in the denitrification tank is controlled at 10–35°C.

[0051] The following will describe in detail, with different examples, a rapid start-up method for anaerobic ammonia oxidation provided in this application, which is implemented through a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing.

[0052] Example 1:

[0053] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0054] 1. Solid sulfur particles 4 are heated to 130°C under the action of temperature control unit 1 in the liquid sulfur spray module, and become liquid sulfur 5;

[0055] 2. Liquid sulfur 5 is sprayed onto the modified PVDC mesh filler 7 through the atomizing nozzle 2 to form a porous sulfur layer. At the same time, pyrrhotite powder 6 (5% of the total mass of the PVDC mesh filler) is added to the modified PVDC mesh filler 7.

[0056] 3. The modified PVDC mesh filler 7 after spraying is cooled down to room temperature (cooling rate 20℃ / s) by the rapid cooling unit 3 in the liquid sulfur spray module to obtain the composite PVDC mesh filler.

[0057] 4. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into the biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0058] 5. Place the inoculated biological rotating disc into the denitrification tank;

[0059] 6. Start the biological rotating disc after inoculation and control the disc speed to 1 r / min. The dissolved oxygen concentration in the denitrification tank is 0.2 mg / L and the temperature is 20℃.

[0060] 7. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0061] Example 2:

[0062] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0063] 1. Solid sulfur particles 4 are heated to 150°C under the action of temperature control unit 1 in the liquid sulfur spray module, and become liquid sulfur 5;

[0064] 2. Liquid sulfur 5 is sprayed onto the modified PVDC mesh filler 7 through the atomizing nozzle 2 to form a porous sulfur layer. At the same time, pyrrhotite powder 6 (8% of the total mass of the PVDC mesh filler) is added to the modified PVDC mesh filler 7.

[0065] 3. The modified PVDC mesh filler 7 after spraying is cooled down to room temperature (cooling rate 23℃ / s) by the rapid cooling unit 3 in the liquid sulfur spray module to obtain the composite PVDC mesh filler.

[0066] 4. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into the biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0067] 5. Place the inoculated biological rotating disc into the denitrification tank;

[0068] 6. Start the biological rotating disc after inoculation and control the disc speed to 2 r / min. The dissolved oxygen concentration in the denitrification tank is 0.35 mg / L and the temperature is 25℃.

[0069] 7. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0070] Example 3:

[0071] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0072] 1. Solid sulfur particles 4 are heated to 120°C under the action of temperature control unit 1 in the liquid sulfur spray module, and become liquid sulfur 5;

[0073] 2. Liquid sulfur 5 is sprayed onto the modified PVDC mesh filler 7 through the atomizing nozzle 2 to form a porous sulfur layer. At the same time, pyrrhotite powder 6 (6% of the total mass of the PVDC mesh filler) is added to the modified PVDC mesh filler 7.

[0074] 3. The modified PVDC mesh filler 7 after spraying is cooled down to room temperature (cooling rate 25℃ / s) by the rapid cooling unit 3 in the liquid sulfur spray module to obtain the composite PVDC mesh filler.

[0075] 4. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into the biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0076] 5. Place the inoculated biological rotating disc into the denitrification tank;

[0077] 6. Start the biological rotating disc after inoculation and control the disc speed to 1.5 r / min. The dissolved oxygen concentration in the denitrification tank is 0.4 mg / L and the temperature is 10℃.

[0078] 7. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0079] Example 4:

[0080] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0081] 1. Solid sulfur particles 4 are heated to 158°C under the action of temperature control unit 1 in the liquid sulfur spray module, and become liquid sulfur 5;

[0082] 2. Liquid sulfur 5 is sprayed onto the modified PVDC mesh filler 7 through the atomizing nozzle 2 to form a porous sulfur layer. At the same time, pyrrhotite powder 6 (10% of the total mass of the PVDC mesh filler) is added to the modified PVDC mesh filler 7.

[0083] 3. The modified PVDC mesh filler 7 after spraying is cooled down to room temperature (cooling rate 26℃ / s) by the rapid cooling unit 3 in the liquid sulfur spray module to obtain the composite PVDC mesh filler.

[0084] 4. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into the biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0085] 5. Place the inoculated biological rotating disc into the denitrification tank;

[0086] 6. Start the biological rotating disc after inoculation and control the disc speed to 3 r / min. The dissolved oxygen concentration in the denitrification tank is 0.5 mg / L and the temperature is 35℃.

[0087] 7. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0088] Example 5:

[0089] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0090] 1. Solid sulfur particles 4 are heated to 140°C under the action of temperature control unit 1 in the liquid sulfur spray module, and become liquid sulfur 5;

[0091] 2. Liquid sulfur 5 is sprayed onto the modified PVDC mesh filler 7 through the atomizing nozzle 2 to form a porous sulfur layer. At the same time, pyrrhotite powder 6 (7% of the total mass of the PVDC mesh filler) is added to the modified PVDC mesh filler 7.

[0092] 3. The modified PVDC mesh filler 7 after spraying is cooled down to room temperature (cooling rate 28℃ / s) by the rapid cooling unit 3 in the liquid sulfur spray module to obtain the composite PVDC mesh filler.

[0093] 4. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into the biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0094] 5. Place the inoculated biological rotating disc into the denitrification tank;

[0095] 6. Start the biological rotating disc after inoculation and control the disc speed to 2.5 r / min. The dissolved oxygen concentration in the denitrification tank is 0.25 mg / L and the temperature is 30℃.

[0096] 7. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0097] Example 6:

[0098] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0099] 1. Solid sulfur particles 4 are heated to 135°C under the action of temperature control unit 1 in the liquid sulfur spray module, and become liquid sulfur 5;

[0100] 2. Liquid sulfur 5 is sprayed onto the modified PVDC mesh filler 7 through the atomizing nozzle 2 to form a porous sulfur layer. At the same time, pyrrhotite powder 6 (9% of the total mass of the PVDC mesh filler) is added to the modified PVDC mesh filler 7.

[0101] 3. The modified PVDC mesh filler 7 after spraying is cooled down to room temperature (cooling rate 30℃ / s) by the rapid cooling unit 3 in the liquid sulfur spray module to obtain the composite PVDC mesh filler.

[0102] 4. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into the biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0103] 5. Place the inoculated biological rotating disc into the denitrification tank;

[0104] 6. Start the biological rotating disc after inoculation and control the disc speed to 2 r / min. The dissolved oxygen concentration in the denitrification tank is 0.3 mg / L and the temperature is 15℃.

[0105] 7. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0106] Comparative Example 1:

[0107] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0108] 1. Solid sulfur particles 4 are added to the modified PVDC mesh filler 7, and pyrrhotite powder 6 (5% of the total mass of the PVDC mesh filler) is added to the modified PVDC mesh filler 7 to obtain a composite PVDC mesh filler.

[0109] 2. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into a biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0110] 3. Place the inoculated biological rotating disc into the denitrification tank;

[0111] 4. Start the biological rotating disc after inoculation and control the disc speed to 1 r / min. The dissolved oxygen concentration in the denitrification tank is 0.2 mg / L and the temperature is 20℃.

[0112] 5. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0113] Comparative Example 2:

[0114] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0115] 1. Solid sulfur particles 4 are heated to 120°C under the action of temperature control unit 1 in the liquid sulfur spray module, and become liquid sulfur 5;

[0116] 2. Liquid sulfur 5 is sprayed onto the modified PVDC mesh filler 7 through atomizing nozzle 2 to form a porous sulfur layer;

[0117] 3. The modified PVDC mesh filler 7 after spraying is cooled down to room temperature (cooling rate 25℃ / s) by the rapid cooling unit 3 in the liquid sulfur spray module to obtain the composite PVDC mesh filler.

[0118] 4. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into the biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0119] 5. Place the inoculated biological rotating disc into the denitrification tank;

[0120] 6. Start the biological rotating disc after inoculation and control the disc speed to 1.5 r / min. The dissolved oxygen concentration in the denitrification tank is 0.4 mg / L and the temperature is 10℃.

[0121] 7. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0122] Comparative Example 3:

[0123] A rapid start-up method for anaerobic ammonia oxidation, implemented using a rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, includes the following steps:

[0124] 1. Solid sulfur particles 4 are incorporated into modified PVDC mesh filler 7 to obtain composite PVDC mesh filler;

[0125] 2. Inoculate activated sludge containing anaerobic ammonia oxidizing bacteria into a biological rotating disc loaded with composite PVDC mesh packing to form a biofilm;

[0126] 3. Place the inoculated biological rotating disc into the denitrification tank;

[0127] 4. Start the biological rotating disc after inoculation and control the disc speed to 2 r / min. The dissolved oxygen concentration in the denitrification tank is 0.3 mg / L and the temperature is 15℃.

[0128] 5. Introduce the wastewater to be treated, monitor and provide feedback on the performance indicators before and after wastewater treatment.

[0129] Refer to HJ 535-2009 for the determination of NH4 in wastewater before and after rapid start-up of anaerobic ammonium oxidation. + -N content; NO3 content in wastewater before and after rapid start-up of anaerobic ammonia oxidation was determined according to HJ / T346-2007. - -N content; SO4 content in wastewater before and after rapid start-up of anaerobic ammonia oxidation was determined according to HJ / T342-2007. 2- content.

[0130] The NH4 content of the wastewater before and after the rapid start-up of the anaerobic ammonium oxidation process in the biofilter rotary disc system was measured. + -N content and NO3 - The -N content was analyzed, the removal rate of the corresponding indicators was calculated, and the SO4 content in the wastewater before and after the rapid start-up of anaerobic ammonia oxidation was measured. 2- The content reflects the actual effect of the anaerobic ammonia oxidation rapid start-up system and method, as shown in Tables 1 to 3 below.

[0131] Table 1. NH4 content in wastewater before and after rapid start-up of anaerobic ammonium oxidation + -N content and NH4 + -N removal rate

[0132]

[0133]

[0134] Table 2. NO3--N content and NO3--N removal rate in wastewater before and after rapid start-up of anaerobic ammonium oxidation.

[0135]

[0136] Table 3. SO4 content in wastewater before and after rapid start-up of anaerobic ammonium oxidation 2- content

[0137] Example 1 177 236 Example 2 173 231 Example 3 169 224 Example 4 176 235 Example 5 179 242 Example 6 172 229 Comparative Example 1 193 267 Comparative Example 2 231 358 Comparative Example 3 317 473

[0138] As shown in Tables 1 to 3, the NH4 in Examples 1 to 6 +-N removal rates are generally above 98%, NO3--N removal rates are generally around 97%, and SO4 removal rates are around 15 days. 2- The content is generally below 250 mg / L; and all of the above indicators are far superior to those of comparative examples 1 to 3.

[0139] This is because Examples 1-6 achieve highly efficient coupling of short-range sulfur autotrophic denitrification and anaerobic ammonia oxidation through precise loading of liquid sulfur and enhancement with pyrrhotite, shortening the start-up cycle to less than 15 days and significantly improving engineering application efficiency. Liquid sulfur is atomized and sprayed at 120-158℃ and rapidly cooled to form a porous sulfur layer on the PVDC mesh packing, greatly increasing the specific surface area of ​​the resulting composite PVDC mesh packing, which is beneficial for bacterial adhesion and enrichment. Furthermore, it allows for controllable sulfur release rates and avoids the problem of easy caking of traditional sulfur particles, ensuring a stable supply of nitrite. Moreover, the pyrrhotite powder incorporated into the PVDC mesh packing can act as an electron mediator, through Fe... 3+ / Fe 2+ The activity of sulfate-reducing bacteria is inhibited by the circulation, thereby controlling the sulfate (SO42-) concentration and reducing the negative impact on the quality of the effluent.

[0140] In Comparative Example 1, liquid sulfur was not sprayed onto the PVDC mesh packing; instead, solid sulfur was directly incorporated. Therefore, a porous sulfur layer could not be formed. Consequently, it was not as conducive to bacterial adhesion and accumulation as a porous sulfur layer. Furthermore, directly incorporating solid sulfur into the PVDC mesh packing could not ensure a controllable sulfur release rate and could not avoid the problem of easy caking. Therefore, ultimately, NH4... + The 15-day removal rates of SO4-N and NO3-N both decreased to some extent; on day 15, SO4... 2- The content increased to some extent.

[0141] In Comparative Example 2, although liquid sulfur was sprayed onto the PVDC mesh filler, pyrrhotite powder was not incorporated simultaneously, therefore Fe could not pass through. 3+ / Fe 2+ The cycle inhibits the activity of sulfate-reducing bacteria, thus making it impossible to control sulfate (SO4) levels. 2- ) concentration, final NH4 + While the 15-day removal rates of -N and NO3--N decreased to some extent, SO4 removal rates on day 15 also increased. 2- The content has increased significantly.

[0142] In Comparative Example 3, neither liquid sulfur was sprayed onto the PVDC mesh packing, nor was pyrrhotite powder incorporated simultaneously; for the same reasons as Comparative Examples 1 and 2, the final NH4 + -N 15-day removal rate, NO3 --N 15-day removal rate and SO4 15-day removal rate 2- The content of all three indicators was the worst.

[0143] The above results demonstrate and describe the basic principles and main features of this application, as well as its advantages.

[0144] Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, such as producing raw materials for the biochemical industry based on this method or a modified method. All such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the equivalents of the appended claims.

Claims

1. A rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing, characterized in that, The system includes a denitrification tank and a biological rotating disc placed in the denitrification tank. The biological rotating disc is loaded with composite PVDC mesh packing. The composite PVDC mesh packing is prepared by a packing composite device, which includes a temperature control unit (1), an atomizing nozzle (2), and a rapid cooling unit (3). The preparation method of the composite PVDC mesh packing includes: Solid sulfur particles (4) are heated under the action of temperature control unit (1) and become liquid sulfur (5). Liquid sulfur (5) is sprayed onto the modified PVDC mesh filler (7) through an atomizing nozzle (2) to form a porous sulfur layer, while pyrrhotite powder (6) is added to the modified PVDC mesh filler (7). After spraying, the modified PVDC mesh filler (7) is cooled to room temperature by the rapid cooling unit (3) to obtain the composite PVDC mesh filler. The modified PVDC mesh filler (7) is obtained by soaking PVDC mesh filler in acidic potassium permanganate solution and spraying silane coupling agent KH-580 on the surface; the concentration of the acidic potassium permanganate solution is 0.1 mol / L; the amount of silane coupling agent KH-580 is 2 to 4% of the total mass of PVDC mesh filler.

2. The rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing as described in claim 1, characterized in that, The temperature of the liquid sulfur (5) is controlled at 120~158℃; the amount of liquid sulfur (5) sprayed is 2~8% of the total mass of the modified PVDC mesh filler (7).

3. The rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing as described in claim 1, characterized in that, The aperture of the atomizing nozzle (2) is 50~100μm; the thickness of the porous sulfur layer is 50~200μm; and the porosity of the porous sulfur layer is 30~40%.

4. The rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing as described in claim 1, characterized in that, The pyrrhotite powder (6) has a mesh size of 200 mesh; the mass of the pyrrhotite powder (6) is 5-10% of the total mass of the modified PVDC mesh filler (7).

5. The rapid start-up system for anaerobic ammonia oxidation based on composite PVDC mesh packing according to claim 1, characterized in that, The cooling rate of the modified PVDC mesh filler (7) after spraying is ≥20℃ / s.

6. A rapid start-up method for anaerobic ammonia oxidation, implemented using an anaerobic ammonia oxidation rapid start-up system based on composite PVDC mesh packing as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Activated sludge containing anaerobic ammonia oxidizing bacteria is inoculated into a biological rotating disc loaded with composite PVDC mesh packing to form a biofilm; Place the inoculated biological rotating disc into the denitrification tank; Start the biological rotating disc after inoculation and control the disc speed, dissolved oxygen concentration and temperature in the denitrification tank; The wastewater to be treated is introduced, and the performance indicators before and after wastewater treatment are monitored and reported.

7. The rapid start-up method for anaerobic ammonium oxidation according to claim 6, characterized in that, The biofilm has an adhesion amount of ≥15 g / L on the packing material; the relative abundance of anaerobic ammonia oxidizing bacteria on the biofilm is >40%.

8. The rapid start-up method for anaerobic ammonia oxidation according to claim 6, characterized in that, The inoculated biological rotating disc has a water depth coverage of 70%-80% in the denitrification tank; the rotation speed of the inoculated biological rotating disc is 1~3 r / min.

9. The rapid start-up method for anaerobic ammonia oxidation according to claim 6, characterized in that, In the denitrification tank, the concentration of dissolved oxygen is controlled at 0.2~0.5 mg / L; the temperature in the denitrification tank is controlled at 10~35℃.

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