High-ammonia-nitrogen wastewater treatment process

Abstract

The invention discloses a high-ammonia-nitrogen wastewater treatment process, and belongs to the technical field of pyridine wastewater treatment, and the high-ammonia-nitrogen wastewater treatment process comprises the following steps: preparing hydrotalcite: weighing cobalt nitrate, magnesium nitrate and aluminum nitrate, adding distilled water, and stirring to obtain a salt solution; weighing sodium hydroxide and anhydrous sodium carbonate, adding distilled water, and stirring to obtain alkali liquor; pumping the salt solution and the alkali solution into a round-bottom flask, and heating and dispersing the round-bottom flask on an oil bath pan; putting the ground sample into a ceramic crucible, calcining in a muffle furnace, weighing a silver-ammonia solution and acetaldehyde, and pouring into a round-bottom flask; the pyridine wastewater is weighed, the hydrotalcite is added, stirring adsorption is performed for 20 min, the hydrogen peroxide is added, suction filtration is performed after the reaction, and the hydrotalcite is filtered and separated out for recycling. The problem that existing wastewater treatment is difficult is solved. The method has the advantages of high catalytic activity, easiness in recovery and reutilization of hydrotalcite, no need of adding any auxiliary chemical reagent, mild reaction conditions, low cost and convenience in operation, and can meet the requirements of industrial production.

Description

Technical Field

[0001] The invention relates to the technical field of pyridine wastewater treatment, and in particular to a high-ammonia nitrogen wastewater treatment process. Background Art

[0002] A large amount of pyridine-containing wastewater is generated during the pyridine production process. The COD of the wastewater is 60,000 ppm and the ammonia nitrogen is around 5,000 ppm. These wastewaters with high COD, high ammonia nitrogen, high color and containing substances such as pyridine and benzene are difficult to treat.

[0003] Currently, pyridine wastewater is primarily treated through adsorption, distillation, and incineration. However, due to the high volume of water in the wastewater, the adsorption method requires a correspondingly large amount of adsorbent, which is difficult to regenerate and results in high treatment costs. The high design temperature and volume required for incinerators also increase treatment costs.

[0004] Among them, Chinese patent application publication number CN102923917A discloses a wastewater treatment method, which first pre-treats the wastewater to remove suspended matter, then adjusts the salinity and pH so that pyridine forms a cometabolism matrix with nitrate and nitrite. After anaerobic cometabolism, the wastewater enters an aerobic process for nitrification, and the generated nitrate returns to the anaerobic process to repeat the cometabolism reaction; the ammonia nitrogen degradation rate can reach 97%, but this method has a long microbial acclimation cycle, poor shock resistance and low applicable concentration.

[0005] Among them, Chinese patent application CN106554078A discloses a method for combining in-situ oxygen production regulated by microcurrent with traditional anaerobic pyridine degradation. This involves anaerobic acclimation of sludge and the slow application of a 0.1-0.4 mA DC current to achieve pyridine and ammonia degradation. However, this method is currently only in the experimental stage and industrialization is difficult, resulting in ammonia degradation efficiency of only 22%. Summary of the Invention

[0006] The purpose of the present invention is to provide a high ammonia nitrogen wastewater treatment process, which can effectively reduce the ammonia nitrogen content and reduce the amount of wastewater incinerated without affecting the subsequent biochemical treatment, so that the wastewater meets the discharge standards, and can solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high-ammonia nitrogen wastewater treatment process, comprising:

[0009] Preparation of hydrotalcite:

[0010] Weigh a certain molar amount of cobalt nitrate, magnesium nitrate, and aluminum nitrate into a 500ml clean beaker, add 300ml of distilled water, and stir evenly with a glass rod to obtain a salt solution;

[0011] Weigh a certain molar amount of sodium hydroxide and anhydrous sodium carbonate into a 1000ml clean beaker, add 600ml of distilled water, and stir evenly with a glass rod to obtain lye;

[0012] Use a peristaltic pump to pump the salt solution and alkali solution into a clean round-bottom flask respectively, and place it in an oil bath to heat and disperse. After filtering, wash it thoroughly with distilled water, dry it, and then take it out to cool.

[0013] The ground sample was placed in a ceramic crucible using a mortar and pestle, and calcined in a muffle furnace. A certain amount of silver ammonia solution and acetaldehyde were weighed and poured into a 100 ml round-bottom flask. The mixture was stirred and aged in an oil bath, filtered, washed, and dried in an oven.

[0014] Synergistic reaction of hydrotalcite and hydrogen peroxide:

[0015] A certain amount of pyridine wastewater is weighed, suspended matter is filtered, large particles of impurities are removed, and the wastewater is placed in a reactor. A certain amount of hydrotalcite is added, stirred and adsorbed for 20 minutes, hydrogen peroxide is added, and the reaction is carried out at a certain stirring speed. After the reaction is completed, suction is filtered to separate the hydrotalcite, and the hydrotalcite is recycled to achieve an ammonia nitrogen removal rate of more than 95% in the treated wastewater.

[0016] Preferably, the molar amount of cobalt is 2-3.

[0017] Preferably, the salt solution is pink and turns blue-brown after being heated and dispersed.

[0018] Preferably, the calcination temperature is 500-700° C., and the calcination time is 4 hours.

[0019] Preferably, the Ag content in the silver ammonia solution is 0.5%-2%.

[0020] Preferably, the amount of hydrogen peroxide added is 1%-5% of the mass of the wastewater.

[0021] Preferably, the diameter of the hydrotalcite particles is 20-50 μm, and the amount of hydrotalcite added is 1%-5%.

[0022] Preferably, the stirring speed is 800 rpm, the reaction time is 5-10 hours, and the temperature is 20-40°C.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The invention has high catalytic activity, and the hydrotalcite is easy to recycle and reuse. Metal ions in the solution are regenerated under the action of hydrogen peroxide and re-adsorbed onto the surface of the hydrotalcite. The process does not require the addition of any auxiliary chemical reagents, and has mild reaction conditions, low cost, and convenient operation. The hydrotalcite and hydrogen peroxide can be combined in adsorption-oxidation, and the catalytic oxidation fully exerts a synergistic effect, which can meet the needs of industrial production, greatly reduce production costs, reduce material and energy consumption, achieve clean production, and reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a comparison diagram of TG thermogravimetric analysis of different cobalt molar amounts of the present invention;

[0026] Figure 2 This is a DTA differential thermal analysis comparison diagram of different cobalt molar amounts of the present invention;

[0027] Figure 3 This is a comparison diagram of the oxidation reaction of unloaded LSV with a cobalt molar amount of 2.5 at different temperatures according to the present invention;

[0028] Figure 4 This is a comparison diagram of the reduction reaction of unloaded LSV with a cobalt molar amount of 2.5 at different temperatures according to the present invention. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In order to solve the existing wastewater COD of 60000ppm, ammonia nitrogen of about 5000ppm, high COD, high ammonia nitrogen, high color and containing pyridine, benzene and other substances, the problem of high difficulty in treating wastewater, please refer to Figure 1-4 , this embodiment provides the following technical solutions:

[0031] Example 1

[0032] Weigh 2 moles of cobalt nitrate, magnesium nitrate, and aluminum nitrate into a 500ml clean beaker, add 300ml of distilled water, and stir evenly with a glass rod to obtain a salt solution;

[0033] Weigh 2 mol of sodium hydroxide and 0.1 mol of anhydrous sodium carbonate respectively into a 1000 ml clean beaker, add 600 ml of distilled water, and stir evenly with a glass rod to obtain lye;

[0034] The salt solution and alkali solution prepared above were pumped into a clean round-bottom flask using two peristaltic pumps, respectively, at a pump speed of 2 rpm for the salt solution and 4 rpm for the alkali solution. The flasks were then placed in an oil bath and heated at 80°C for 4 h. The mixture was filtered, washed thoroughly with distilled water, dried at 100°C for 10 h, and cooled. The ground sample was placed in a ceramic crucible using a mortar and calcined in a muffle furnace at 700°C for 4 h.

[0035] Then, a silver ammonia solution with a silver content of 0.5% and acetaldehyde were poured into a 100 ml round-bottom flask, stirred and aged in an oil bath at 60°C for 2 h, filtered, washed, and dried in an oven;

[0036] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L, and a certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 40 μm were added to the reactor, wherein the hydrogen peroxide accounted for 2% of the wastewater mass and the hydrotalcite accounted for 2% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours, and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 40 mg / L, and the ammonia nitrogen removal rate was greater than 99.2%.

[0037] It should be noted that hydrotalcite is a layered double hydroxide (LDH) with Lewis acid (metal site) and Base (hydroxyl or interlayer anion) can activate H2O2; H2O2 itself has limited oxidizing ability, but the metal in the hydrotalcite layer can catalyze the decomposition of H2O2 to produce highly active oxygen species (such as ·OH, O2· - ), and the alkaline environment of hydrotalcite (OH - ) can promote the homolytic decomposition of H2O2 to generate ·OH radicals. Hydrotalcite provides highly dispersed metal active centers to avoid ineffective decomposition of H2O2 and increase the yield of ·OH. Interlayer anions can stabilize active intermediates and prolong the life of free radicals. It has a strong adsorption capacity for organic pollutants, enriches the target on the surface, and reacts closely with the active oxygen generated by H2O2 to improve the degradation efficiency. The thermal stability and recyclability of hydrotalcite enable it to remain active in multiple cycles, and H2O2, as a green oxidant, eventually decomposes into H2O and O2 without secondary pollution. The transition metals in hydrotalcite catalyze H2O2 to produce highly active hydroxyl radicals (·OH) through a Fenton-like reaction, and organic matter is completely oxidized by ·OH to CO2 and H2O, directly reducing COD. ·OH can oxidize ammonia nitrogen to nitrite or nitrate, and the interlayer anions of LDH can react with NH4 + Exchange, ammonia nitrogen is adsorbed, the metal sites on the surface of hydrotalcite form complexes with ammonia nitrogen, and oxidize ammonia nitrogen to N2 or NO3 -It's not just adsorption. OH can indiscriminately attack the pyridine ring, decomposing it into small acid molecules through a ring-opening reaction or ultimately mineralizing into CO2 and H2O. The rupture of the pyridine ring may generate small nitrogen-containing molecules, which are further oxidized to N2 in the alkaline environment of LDH. The layered structure and alkaline surface of LDH can adsorb pyridine-like organics, enriching them on the catalyst surface, increasing the local reaction concentration, and accelerating degradation. The high-valent metals in hydrotalcite can directly participate in electron transfer, promoting the oxidation of organic matter.

[0038] This method has high catalytic activity, and the hydrotalcite is easily recovered and reused. Metal ions in the solution are regenerated by hydrogen peroxide and re-adsorbed onto the hydrotalcite surface. This process does not require the addition of any auxiliary chemical reagents. The reaction conditions are mild, cost-effective, and easy to operate. The hydrotalcite and hydrogen peroxide combine for adsorption-oxidation, fully leveraging the synergistic catalytic oxidation effect. This method can meet the needs of industrial production, significantly reducing production costs, energy consumption, and energy consumption, achieving clean production and minimizing environmental pollution.

[0039] Example 2

[0040] Hydrotalcite was prepared according to the method of Example 1, except that: in Example 2, a silver ammonia solution with a silver content of 2% was added;

[0041] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L. A certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 40 μm were added to the reactor, wherein the hydrogen peroxide accounted for 2% of the wastewater mass and the hydrotalcite accounted for 2% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours, and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 210 mg / L, and the ammonia nitrogen removal rate was greater than 95.8%.

[0042] Example 3

[0043] Hydrotalcite was prepared according to the method of Example 1, except that: in Example 2, a silver ammonia solution with a silver content of 1% was added;

[0044] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L. A certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 40 μm were added to the reactor, wherein the hydrogen peroxide accounted for 2% of the wastewater mass and the hydrotalcite accounted for 2% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours, and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 175 mg / L, and the ammonia nitrogen removal rate was greater than 96.5%.

[0045] Example 4

[0046] Hydrotalcite was prepared according to the method of Example 1;

[0047] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L. A certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 40 μm were added to the reactor, wherein the hydrogen peroxide accounted for 1% of the wastewater mass and the hydrotalcite accounted for 2% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 290 mg / L, and the ammonia nitrogen removal rate was greater than 94.2%.

[0048] Example 5

[0049] Hydrotalcite was prepared according to the method of Example 1;

[0050] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L. A certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 40 μm were added to the reactor, wherein the hydrogen peroxide accounted for 5% of the wastewater mass and the hydrotalcite accounted for 2% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours, and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 80 mg / L, and the ammonia nitrogen removal rate was greater than 98.4%.

[0051] Example 6

[0052] Hydrotalcite was prepared according to the method of Example 1;

[0053] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L. A certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 20 μm were added to the reactor, wherein the hydrogen peroxide accounted for 2% of the wastewater mass and the hydrotalcite accounted for 2% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 180 mg / L, and the ammonia nitrogen removal rate was greater than 96.4%.

[0054] Example 7

[0055] Hydrotalcite was prepared according to the method of Example 1;

[0056] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L. A certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 50 μm were added to the reactor, wherein the hydrogen peroxide accounted for 2% of the wastewater mass and the hydrotalcite accounted for 2% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 155 mg / L, and the ammonia nitrogen removal rate was greater than 96.9%.

[0057] Example 8

[0058] Hydrotalcite was prepared according to the method of Example 1;

[0059] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L. A certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 40 μm were added to the reactor, wherein the hydrogen peroxide accounted for 2% of the wastewater mass and the hydrotalcite accounted for 1% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 145 mg / L, and the ammonia nitrogen removal rate was greater than 97.1%.

[0060] Embodiment 9

[0061] Hydrotalcite was prepared according to the method of Example 1;

[0062] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L. A certain amount of hydrogen peroxide and a certain amount of hydrotalcite with a particle diameter of 40 μm were added to the reactor, wherein the hydrogen peroxide accounted for 2% of the wastewater mass and the hydrotalcite accounted for 5% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 115 mg / L, and the ammonia nitrogen removal rate was greater than 97.7%.

[0063] Comparative Example 1

[0064] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L, and a certain amount of hydrogen peroxide was added, wherein the hydrogen peroxide was 2% of the wastewater mass. The reaction was carried out at a stirring speed of 800 rpm for 6 hours, and the reaction temperature was controlled at 30°C. After the reaction was completed, the ammonia nitrogen content of the treated wastewater was 4200 mg / L, and the ammonia nitrogen removal rate was <20%.

[0065] Comparative Example 2

[0066] Hydrotalcite was prepared according to the method of Example 1;

[0067] A certain amount of pyridine wastewater was placed in a reactor, wherein the ammonia nitrogen content in the pyridine wastewater was 5000 mg / L, and a certain amount of hydrotalcite with a particle diameter of 40 μm was added to the reactor, wherein the hydrotalcite was 2% of the mass of the wastewater. The reaction was carried out at a stirring speed of 800 rpm for 6 hours, and the reaction temperature was controlled at 30°C. After the reaction was completed, the hydrotalcite was filtered and separated during filtration. The ammonia nitrogen content of the treated wastewater was 4300 mg / L, and the ammonia nitrogen removal rate was less than 15%.

[0068] In Comparative Example 1, only hydrogen peroxide was added without hydrotalcite, and the single oxidation resulted in a low ammonia nitrogen removal rate. In Comparative Example 2, only hydrotalcite was added without hydrogen peroxide. Chinese patent application publication number CN104445428A uses thermally activated Mg-Al hydrotalcite, with an initial ammonia nitrogen of 100 mg / L and a removal rate of 85%-90%. However, the adsorption capacity of hydrotalcite for ammonia nitrogen is limited, typically 10-50 mg / g, and high-concentration wastewater requires frequent regeneration, resulting in a low ammonia nitrogen removal rate.

[0069] Specifically, thermogravimetric analysis and differential thermal analysis were performed using precursors with different cobalt molar amounts. From the TG thermogravimetric analysis comparison chart, it can be seen that when the cobalt molar amount is 2, the weight loss and residue content in each stage are relatively low, indicating that when the cobalt molar amount is 2, a reaction occurs at around 0-250 degrees. After 600 degrees, the curve becomes flat, indicating that the reaction is over, and the sample obtained thereafter is a more stable desired sample. When the cobalt is at other molar amounts, the residue content is higher, probably because the cobalt molar amount is too high. From the DTA differential thermal analysis comparison chart, it can be seen that there is an endothermic peak at 226°C and an exothermic peak at 254°C. In summary, from the thermogravimetric analysis, it can be seen that when the cobalt molar amount is 2, it is more stable and has a better effect.

[0070] Specifically, the LSV redox conditions at different calcination temperatures when the cobalt molar weight was 2.5 were used. From the oxidation reaction, it can be seen that, except for the blank sample, the LSV slope at 700 degrees is the smallest, and its catalytic effect is the best; in the reduction reaction, since it is in a reducing state, the LSV slope at 700 degrees is the smallest; in summary, under the condition of 700 degrees, the precursor has the best catalytic effect.

[0071] Therefore, the method has high catalytic activity, and the hydrotalcite is easy to recover and reuse. The metal ions in the solution are regenerated under the action of hydrogen peroxide and re-adsorbed onto the surface of the hydrotalcite. The process does not require the addition of any auxiliary chemical reagents, and the reaction conditions are mild, the cost is low, and the operation is convenient. The hydrotalcite and hydrogen peroxide can be combined for adsorption-oxidation, and the catalytic oxidation fully exerts a synergistic effect, which can meet the needs of industrial production, greatly reduce production costs, reduce material and energy consumption, achieve clean production, and reduce environmental pollution.

[0072] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high ammonia nitrogen wastewater treatment process, characterized in that: include: Weigh a certain molar amount of cobalt nitrate, magnesium nitrate, and aluminum nitrate into a 500ml clean beaker, add 300ml of distilled water, and stir evenly with a glass rod to obtain a salt solution; Weigh sodium hydroxide and anhydrous sodium carbonate into a 1000ml clean beaker, add 600ml of distilled water, and stir evenly with a glass rod to obtain lye; Use a peristaltic pump to pump the salt solution and alkali solution into a round-bottom flask respectively, and place it in an oil bath to heat and disperse. After filtering, wash it thoroughly with distilled water, dry it, and then take it out to cool. The ground sample was placed in a ceramic crucible using a mortar and calcined in a muffle furnace. A certain amount of silver ammonia solution and acetaldehyde were weighed and poured into a 100 ml round-bottom flask. The mixture was stirred and aged in an oil bath, filtered, washed, and dried in an oven to obtain hydrotalcite. Weigh a certain amount of pyridine wastewater, filter the suspended matter, remove large particle impurities, and place it in a reactor. Add a certain amount of hydrotalcite, stir and adsorb for 20 minutes, add hydrogen peroxide, react at a certain stirring speed, filter after the reaction, filter and separate the hydrotalcite, and recycle the hydrotalcite.

2. A high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: The molar amount of cobalt is 2-3 respectively.

3. A high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: The salt solution is pink and turns blue-brown after being heated and dispersed.

4. A high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: The calcination temperature is 500-700° C., and the calcination time is 4 hours.

5. A high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: The Ag content in the silver ammonia solution is 0.5%-2%.

6. A high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: The amount of hydrogen peroxide added is 1%-5% of the mass of the wastewater.

7. A high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: The particle diameter of the hydrotalcite is 20-50 μm, and the amount of hydrotalcite added is 1%-5% of the mass of the wastewater.

8. A high ammonia nitrogen wastewater treatment process according to claim 1, characterized in that: The stirring speed is 800 rpm, the reaction time is 5-10 hours, and the temperature is 20-40°C.

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