CN113716810A - Dephosphorization and denitrification integrated A2O process - Google Patents
Dephosphorization and denitrification integrated A2O process Download PDFInfo
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Abstract
The invention discloses a dephosphorization and denitrification integrated A2O process, which comprises the following steps: removing impurities; carrying out anoxic treatment; anaerobic treatment; aerobic treatment; carrying out precipitation treatment; and (3) adsorption treatment, wherein the anoxic treatment adopts the tourmaline particles which take titanium dioxide as a shell and tourmaline powder as an inner core and form a shell-core structure. The method utilizes the difficulty of the existing A2O treatment process and utilizes the tourmaline particles with the shell-core structure to effectively promote the treatment of denitrifying bacteria, thereby greatly improving the treatment efficiency of nitrate radicals, simultaneously improving the treatment capacity of the nitrate radicals and avoiding the subsequent reflux treatment.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a process for removing phosphorus and nitrogen by using a picture A2O.
Background
At present, both countries and common people pay attention to environmental protection, waste water in 'three wastes' is the key point of attention of people, people cannot leave water, pollutants in water can directly or indirectly damage human beings and natural organisms, and great harm is brought to the environment. Water resources are increasingly in shortage, and sewage treatment discharge reaching standards and reclaimed water recycling are increasingly necessary.
The A2O process is formed by sequentially linking anaerobic/anoxic/aerobic functional zones, and achieves the purpose of removing pollutants through phosphorus release in the anaerobic zone, denitrification and denitrification in the anoxic zone, phosphorus absorption in the aerobic zone and nitrification. And the A2O process has higher removal rate of nitrogen, COD and organic matters in the domestic sewage, and can remove phosphorus while denitriding. However, the A2O wastewater denitrification process has a low denitrification rate and requires multiple denitrification treatments for wastewater, and therefore, a plurality of aerobic tanks and anoxic tanks are required, which results in high wastewater denitrification cost.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a dephosphorization and denitrification integrated A2O process, which solves the difficulty of the existing A2O treatment process, effectively promotes the treatment of denitrifying bacteria by using tourmaline particles with a shell-core structure, greatly improves the treatment efficiency of nitrate radicals, simultaneously improves the treatment capacity of the nitrate radicals, and does not need subsequent reflux treatment.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a dephosphorization and denitrification integrated A2O process comprises the following steps:
step 1, removing impurities: removing impurities from the wastewater to be treated, filtering, adjusting the pH value to 6-8,
step 2, anoxic treatment: discharging the waste water after impurity removal into an anoxic tank, and performing internal circulation by using denitrifying bacteria in the tankNitrate radical conversion treatment is carried out on the ring system, and tourmaline particles are fixed in the anoxic pond; the tourmaline has the discharge performance, the discharge performance is from the conversion of electrons, under the condition that the using amount of tourmaline powder is far lower than the content of denitrifying bacteria, under the condition of extremely small amount of electric stimulation, the denitrifying bacteria are under the condition of sufficient carbon source, the treatment of nitrate radical can be accelerated, and the bacteria can be promoted to be rapidly propagated, so that the effect of improving anoxic treatment is achieved, further, the tourmaline powder is fixed in an anoxic tank and is contacted with different denitrifying bacteria in the internal circulation process, the uniform stimulation effect can be obtained, no over stimulation is caused to local bacteria, meanwhile, the loss of tourmaline particles cannot be caused by the fixed structure, and the continuous recycling is formed; the tourmaline particles take titanium dioxide as a shell and tourmaline powder as an inner core to form a shell-core structure, the tourmaline powder in the shell-core structure transfers charges of the tourmaline powder outwards by utilizing the self conductive performance of the titanium dioxide, so that the rapid electric transfer is realized, the contact area between denitrifying bacteria and the tourmaline particles is increased, and the preparation method of the tourmaline particles comprises the following steps; 1, adding tourmaline powder into anhydrous ether, uniformly stirring, and performing ball milling and refining treatment to obtain slurry, wherein the mass ratio of the tourmaline powder to the anhydrous ether is 3:2-5, the uniform stirring speed is 2000r/min, the ball milling and refining temperature is 5-10 ℃, and the pressure is 0.4-0.7 MPa; 2, adding ethyl cellulose into the slurry, rapidly stirring to form viscous slurry, drying and granulating to form core particles, wherein the adding amount of the ethyl cellulose is 2-5% of the mass of the tourmaline powder, the rapid stirring speed is 1000-3000r/min, the temperature is 5-10 ℃, and the drying and granulating temperature is 40-50 ℃; 3, adding n-butyl titanate into ether, stirring uniformly to form titanium-ether liquid, then spraying the titanium-ether liquid on the surface of inner core particles, standing at constant temperature for 10-20min to obtain coated particles, wherein the concentration of n-butyl titanate in the titanium-ether liquid is 200-400g/L, the spraying amount is 20-40mL/min, and the titanium-ether liquid is treated by adopting a small amount of treatment for many times, and the temperature of the constant-temperature standing is 50-80 ℃; a4, standing the coated particles in a reaction kettle for 20-30min at constant temperature, then blowing ultraviolet light for 2-5h to obtain tourmaline particles,atmosphere in the reaction kettle: the volume of the water vapor accounts for 10-15%, the balance is nitrogen, and the constant-temperature standing temperature is 100-200 ℃; the blowing adopts air blowing, the temperature of the ultraviolet light is 200-250 ℃, and the light intensity is 2-6W/cm2。
Step 3, anaerobic treatment: introducing the wastewater after the anoxic treatment into an anaerobic tank, adding a composite carbon source for circulating anaerobic treatment for 2-4h, removing part of BOD, and performing denitrification reaction on part of nitrogen-containing compounds; the composite carbon source comprises C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol;
step 4, aerobic treatment: dissolving the wastewater after anaerobic treatment into an aerobic tank, and carrying out aeration dephosphorization treatment, wherein the dephosphorization adopts microorganisms to remove phosphorus, the aeration treatment is matched in the microorganism dephosphorization process, the gas speed of the aeration treatment is 2-5mL/min, in the step, the oxygen in the air is quickly removed from the wastewater in the aeration treatment process, the dissolved oxygen is increased, meanwhile, the existence of organic matters can provide energy for the microorganisms, the microorganisms absorb phosphorus from the water, and the phosphorus enters cell tissues and is enriched in the microorganisms.
Step 5, standing and precipitating the wastewater after the aerobic treatment, discharging the wastewater from the system in a form of phosphorus-rich sludge after precipitation and separation, and refluxing the residual sludge to an anoxic tank through a peristaltic pump;
step 6, directly discharging the precipitated wastewater after adsorption by activated carbon, wherein the activated carbon is vermiculite composite activated carbon, pores of the activated carbon are opened by using the expansion characteristic of vermiculite to form extensive protection, so that the adsorption area of the activated carbon is increased, the adsorption effect of the activated carbon is improved, the vermiculite activated carbon after use can play a role in contraction, impurities are completely contracted into the activated carbon, and secondary pollution is avoided; the preparation method of the vermiculite composite activated carbon comprises the following steps: b1, uniformly stirring vermiculite and activated carbon, then adding ethanol, performing ball milling reaction for 20-40min, and drying to obtain a mixture; the mass ratio of the vermiculite to the activated carbon is 3:5-7, the stirring speed is 1000-2000r/min, the adding amount of the ethanol is 3-6 times of the mass of the activated carbon, the pressure of the ball milling reaction is 0.5-0.8MPa, and the temperature is 40-50 ℃; b2 of the first group of the Chinese characters,adding ethyl cellulose into ether, uniformly stirring, then adding the mixture, uniformly stirring, granulating and drying to obtain mixed particles, wherein the concentration of the ethyl cellulose in the ether is 300-500g/L, the ethyl cellulose accounts for 20-40% of the mass of the mixture, and the granulating and drying temperature is 70-90 ℃; b3, adding ethyl cellulose into ether, then adding fine vermiculite powder, and uniformly stirring to form slurry; then coating the mixture on the mixed particles, and drying to form coated particles; the concentration of the ethyl cellulose on the ethyl ether is 400-500g/L, the addition amount of the vermiculite fine powder is 4-9 times of the mass of the ethyl cellulose, and the coating amount is 3-6g/cm2(ii) a b4, performing illumination treatment on the coated particles for 3-6 hours to obtain the vermiculite composite activated carbon, wherein the illumination intensity is 5-10W/cm 2.
Before denitrifying bacteria are added into the anoxic tank in the step 2, the tourmaline particles are electrified for 3-5min, the electrification voltage is 0.2-0.5V, the electrification treatment prompts the titanium dioxide to nitrify the nitride and convert the nitride into nitrate, and meanwhile, the short-time and low-voltage arrangement ensures that the treatment only aims at the nitride which is not nitrate.
From the above description, it can be seen that the present invention has the following advantages:
1. the method utilizes the difficulty of the existing A2O treatment process and utilizes the tourmaline particles with the shell-core structure to effectively promote the treatment of denitrifying bacteria, thereby greatly improving the treatment efficiency of nitrate radicals, simultaneously improving the treatment capacity of the nitrate radicals and avoiding the subsequent reflux treatment.
2. According to the invention, activated carbon amplification can be formed by using vermiculite composite activated carbon, so that the activated carbon adsorption effect is ensured, and the activated carbon is tiled and expanded, so that the action range of the activated carbon is enlarged, and the treatment effect is improved.
3. According to the invention, the tourmaline particles are electrified to be oxidized before bacteria are added, so that internal nitrate radicals are homogenized, the bearing pressure of post-treatment is reduced, the treatment efficiency is improved, and the electrified tourmaline particles can form an activation effect.
Detailed Description
The present invention is described in detail with reference to examples, but the present invention is not limited to the claims.
Example 1
A dephosphorization and denitrification integrated A2O process comprises the following steps:
step 1, removing impurities: removing impurities from the wastewater to be treated, filtering, adjusting the pH value to 6,
step 2, anoxic treatment: discharging the waste water after impurity removal into an anoxic tank, and performing nitrate radical conversion treatment of an internal circulation system by using denitrifying bacteria in the tank, wherein tourmaline particles are fixed in the anoxic tank; the tourmaline particle takes titanium dioxide as a shell and tourmaline powder as an inner core to form a shell-core structure, and the preparation method of the tourmaline particle comprises the following steps; 1, adding tourmaline powder into anhydrous ether, uniformly stirring, and performing ball milling and refining treatment to obtain slurry, wherein the mass ratio of the tourmaline powder to the anhydrous ether is 3:2, the uniform stirring speed is 1000r/min, the ball milling and refining temperature is 5 ℃, and the pressure is 0.4 MPa; 2, adding ethyl cellulose into the slurry, rapidly stirring to form viscous slurry, drying and granulating to form core particles, wherein the adding amount of the ethyl cellulose is 2% of the mass of the tourmaline powder, the rapid stirring speed is 1000r/min, the temperature is 5 ℃, and the drying and granulating temperature is 40 ℃; a3, adding n-butyl titanate into diethyl ether, stirring uniformly to form titanium-diethyl ether liquid, spraying the titanium-diethyl ether liquid on the surface of inner core particles, and standing at a constant temperature for 10min to obtain coated particles, wherein the concentration of n-butyl titanate in the titanium-diethyl ether liquid is 200g/L, the spraying amount is 20mL/min, the titanium-diethyl ether liquid is treated in a small amount for multiple times, and the temperature of standing at the constant temperature is 50 ℃; a4, standing the coated particles in a reaction kettle for 20min at constant temperature, and then blowing ultraviolet light for 2h to obtain the tourmaline particles, wherein the atmosphere in the reaction kettle is as follows: the volume ratio of the water vapor is 10-15%, the balance is nitrogen, and the temperature of constant temperature standing is 100 ℃; the blowing adopts air blowing, the temperature of ultraviolet illumination is 200 ℃, and the illumination intensity is 2W/cm2；
Step 3, anaerobic treatment: introducing the wastewater after the anoxic treatment into an anaerobic tank, adding a composite carbon source for circulating anaerobic treatment for 2 hours, removing part of BOD, and performing denitrification reaction on part of nitrogen-containing compounds; the composite carbon source comprises C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol;
step 4, aerobic treatment: dissolving the wastewater after the anaerobic treatment into an aerobic tank, and carrying out aeration dephosphorization treatment, wherein the dephosphorization adopts microorganism dephosphorization, the aeration treatment is matched in the microorganism dephosphorization process, and the gas speed of the aeration treatment is 2 mL/min;
step 5, standing and precipitating the wastewater after the aerobic treatment, discharging the wastewater from the system in a form of phosphorus-rich sludge after precipitation and separation, and refluxing the residual sludge to an anoxic tank through a peristaltic pump;
and 6, directly discharging the precipitated wastewater after adsorption by using activated carbon, wherein the activated carbon is vermiculite composite activated carbon, and the preparation method of the vermiculite composite activated carbon comprises the following steps: b1, uniformly stirring vermiculite and activated carbon, then adding ethanol, carrying out ball milling reaction for 20min, and drying to obtain a mixture; the mass ratio of the vermiculite to the activated carbon is 3:7, the stirring speed is 1000r/min, the adding amount of the ethanol is 3 times of the mass of the activated carbon, the pressure of the ball milling reaction is 0.5MPa, and the temperature is 40 ℃; b2, adding ethyl cellulose into diethyl ether, uniformly stirring, adding the mixture, uniformly stirring, granulating and drying to obtain mixed particles, wherein the concentration of the ethyl cellulose in the diethyl ether is 300g/L, the ethyl cellulose accounts for 20% of the mass of the mixture, and the granulating and drying temperature is 70 ℃; b3, adding ethyl cellulose into ether, then adding fine vermiculite powder, and uniformly stirring to form slurry; then coating the mixture on the mixed particles, and drying to form coated particles; the concentration of the ethyl cellulose on the ethyl ether is 400-/L, the addition amount of the vermiculite fine powder is 4 times of the mass of the ethyl cellulose, and the coating amount is 3g/cm2(ii) a b4, performing illumination treatment on the coated particles for 3 hours to obtain the vermiculite composite activated carbon, wherein the illumination intensity is 5W/cm2。
And (3) before denitrifying bacteria are added into the anoxic tank in the step (2), electrifying the tourmaline particles for 3min at an electrifying voltage of 0.2V.
In the embodiment, the average COD content in the inlet water of the municipal sewage is 413.7mg/L, the average ammonia nitrogen content is 33.5mg/L, the average total nitrogen content is 39.3mg/L, the total phosphorus content is 5.1mg/L, after treatment, the COD content of the outlet water is 36.1mg/L, the ammonia nitrogen content is 2.6mg/L, the total nitrogen content is 11.2mg/L, and the total phosphorus content is 0.2mg/L, which reaches the first-level A standard of pollutant discharge Standard of municipal Sewage treatment plant.
Example 2
A dephosphorization and denitrification integrated A2O process comprises the following steps:
step 1, removing impurities: removing impurities from the wastewater to be treated, filtering, and adjusting the pH value to 8;
step 2, anoxic treatment: discharging the waste water after impurity removal into an anoxic tank, and performing nitrate radical conversion treatment of an internal circulation system by using denitrifying bacteria in the tank, wherein tourmaline particles are fixed in the anoxic tank; the tourmaline particle takes titanium dioxide as a shell and tourmaline powder as an inner core to form a shell-core structure, and the preparation method of the tourmaline particle comprises the following steps; 1, adding tourmaline powder into anhydrous ether, uniformly stirring, and performing ball milling and refining treatment to obtain slurry, wherein the mass ratio of the tourmaline powder to the anhydrous ether is 3:5, the uniform stirring speed is 2000r/min, the ball milling and refining temperature is 10 ℃, and the pressure is 0.7 MPa; 2, adding ethyl cellulose into the slurry, rapidly stirring to form viscous slurry, drying and granulating to form core particles, wherein the adding amount of the ethyl cellulose is 5% of the mass of the tourmaline powder, the rapid stirring speed is 3000r/min, the temperature is 10 ℃, and the drying and granulating temperature is 50 ℃; a3, adding n-butyl titanate into diethyl ether, stirring uniformly to form titanium-diethyl ether liquid, spraying the titanium-diethyl ether liquid on the surface of inner core particles, and standing at a constant temperature for 20min to obtain coated particles, wherein the concentration of n-butyl titanate in the titanium-diethyl ether liquid is 400g/L, the spraying amount is 40mL/min, the titanium-diethyl ether liquid is treated in a small amount for multiple times, and the temperature of standing at the constant temperature is 80 ℃; a4, standing the coated particles in a reaction kettle at constant temperature for 30min, and then blowing ultraviolet light for 5h to obtain the tourmaline particles, wherein the atmosphere in the reaction kettle is as follows: the volume percentage of the water vapor is 15 percent, the balance is nitrogen, and the temperature of constant temperature standing is 200 ℃; the blowing adopts air blowing, the temperature of ultraviolet illumination is 250 ℃, and the illumination intensity is 6W/cm2。
Step 3, anaerobic treatment: introducing the wastewater after the anoxic treatment into an anaerobic tank, adding a composite carbon source for circulating anaerobic treatment for 4 hours, removing part of BOD, and performing denitrification reaction on part of nitrogen-containing compounds; the composite carbon source comprises C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol;
step 4, aerobic treatment: dissolving the wastewater after the anaerobic treatment into an aerobic tank, and carrying out aeration dephosphorization treatment, wherein the dephosphorization adopts microorganism dephosphorization, the aeration treatment is matched in the microorganism dephosphorization process, and the gas speed of the aeration treatment is 5 mL/min;
step 5, standing and precipitating the wastewater after the aerobic treatment, discharging the wastewater from the system in a form of phosphorus-rich sludge after precipitation and separation, and refluxing the residual sludge to an anoxic tank through a peristaltic pump;
and 6, directly discharging the precipitated wastewater after adsorption by using activated carbon, wherein the activated carbon is vermiculite composite activated carbon, and the preparation method of the vermiculite composite activated carbon comprises the following steps: b1, uniformly stirring vermiculite and activated carbon, then adding ethanol, performing ball milling reaction for 40min, and drying to obtain a mixture; the mass ratio of the vermiculite to the activated carbon is 3:5, the stirring speed is 2000r/min, the adding amount of the ethanol is 6 times of the mass of the activated carbon, the pressure of the ball milling reaction is 0.8MPa, and the temperature is 50 ℃; b2, adding ethyl cellulose into diethyl ether, uniformly stirring, adding the mixture, uniformly stirring, granulating and drying to obtain mixed particles, wherein the concentration of the ethyl cellulose in the diethyl ether is 500g/L, the ethyl cellulose accounts for 40% of the mass of the mixture, and the granulating and drying temperature is 90 ℃; b3, adding ethyl cellulose into ether, then adding fine vermiculite powder, and uniformly stirring to form slurry; then coating the mixture on the mixed particles, and drying to form coated particles; the concentration of the ethyl cellulose on the ethyl ether is 500g/L, the addition amount of the vermiculite fine powder is 9 times of the mass of the ethyl cellulose, and the coating amount is 6g/cm2(ii) a b4, performing illumination treatment on the coated particles for 6 hours to obtain the vermiculite composite activated carbon, wherein the illumination intensity is 10W/cm2。
And (3) before denitrifying bacteria are added into the anoxic tank in the step (2), electrifying the tourmaline particles for 5min at an electrifying voltage of 0.5V.
In the embodiment, the average COD content in the inlet water of the municipal sewage is 425.1mg/L, the average ammonia nitrogen content is 36.2mg/L, the average total nitrogen content is 43.2mg/L, the total phosphorus content is 5.2mg/L, after treatment, the COD content of the outlet water is 27.7mg/L, the ammonia nitrogen content is 2.2mg/L, the total nitrogen content is 9.8mg/L, and the total phosphorus content is 0.2mg/L, which reaches the first-level A standard of pollutant discharge Standard of municipal Sewage treatment plant.
Example 3
A dephosphorization and denitrification integrated A2O process comprises the following steps:
step 1, removing impurities: removing impurities from the wastewater to be treated, filtering, adjusting the pH value to 7,
step 2, anoxic treatment: discharging the waste water after impurity removal into an anoxic tank, and performing nitrate radical conversion treatment of an internal circulation system by using denitrifying bacteria in the tank, wherein tourmaline particles are fixed in the anoxic tank; the tourmaline particle takes titanium dioxide as a shell and tourmaline powder as an inner core to form a shell-core structure, and the preparation method of the tourmaline particle comprises the following steps; 1, adding tourmaline powder into anhydrous ether, uniformly stirring, and performing ball milling refining treatment to obtain slurry, wherein the mass ratio of the tourmaline powder to the anhydrous ether is 3:4, the uniform stirring speed is 1500r/min, the ball milling refining temperature is 8 ℃, and the pressure is 0.6 MPa; 2, adding ethyl cellulose into the slurry, rapidly stirring to form viscous slurry, drying and granulating to form core particles, wherein the adding amount of the ethyl cellulose is 4% of the mass of the tourmaline powder, the rapid stirring speed is 2000r/min, the temperature is 8 ℃, and the drying and granulating temperature is 45 ℃; a3, adding n-butyl titanate into diethyl ether, stirring uniformly to form titanium-diethyl ether liquid, spraying the titanium-diethyl ether liquid on the surface of inner core particles, and standing at a constant temperature for 15min to obtain coated particles, wherein the concentration of n-butyl titanate in the titanium-diethyl ether liquid is 300g/L, the spraying amount is 30mL/min, the titanium-diethyl ether liquid is treated in a small amount for multiple times, and the temperature of standing at the constant temperature is 70 ℃; a4, standing the coated particles in a reaction kettle for 25min at constant temperature, then blowing ultraviolet light for 4h to obtain the tourmaline particles, and reactingAtmosphere in the kettle: the volume percentage of the water vapor is 14 percent, the balance is nitrogen, and the temperature of constant temperature standing is 150 ℃; the air purging is adopted for purging, the temperature of ultraviolet illumination is 230 ℃, and the illumination intensity is 4W/cm2。
Step 3, anaerobic treatment: introducing the wastewater after the anoxic treatment into an anaerobic tank, adding a composite carbon source for circulating anaerobic treatment for 3 hours, removing part of BOD, and performing denitrification reaction on part of nitrogen-containing compounds; the composite carbon source comprises C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol;
step 4, aerobic treatment: dissolving the wastewater after the anaerobic treatment into an aerobic tank, and carrying out aeration dephosphorization treatment, wherein the dephosphorization adopts microorganism dephosphorization, the aeration treatment is matched in the microorganism dephosphorization process, and the gas speed of the aeration treatment is 4 mL/min;
step 5, standing and precipitating the wastewater after the aerobic treatment, discharging the wastewater from the system in a form of phosphorus-rich sludge after precipitation and separation, and refluxing the residual sludge to an anoxic tank through a peristaltic pump;
and 6, directly discharging the precipitated wastewater after adsorption by using activated carbon, wherein the activated carbon is vermiculite composite activated carbon, and the preparation method of the vermiculite composite activated carbon comprises the following steps: b1, uniformly stirring vermiculite and activated carbon, then adding ethanol, performing ball milling reaction for 30min, and drying to obtain a mixture; the mass ratio of the vermiculite to the activated carbon is 1:2, the stirring speed is 1500r/min, the adding amount of the ethanol is 4 times of the mass of the activated carbon, the pressure of the ball milling reaction is 0.7MPa, and the temperature is 45 ℃; b2, adding ethyl cellulose into diethyl ether, uniformly stirring, adding the mixture, uniformly stirring, granulating and drying to obtain mixed particles, wherein the concentration of the ethyl cellulose in the diethyl ether is 400g/L, the ethyl cellulose accounts for 30% of the mass of the mixture, and the granulating and drying temperature is 80 ℃; b3, adding ethyl cellulose into ether, then adding fine vermiculite powder, and uniformly stirring to form slurry; then coating the mixture on the mixed particles, and drying to form coated particles; the concentration of the ethyl cellulose on the ethyl ether is 450g/L, the addition amount of the vermiculite fine powder is 7 times of the mass of the ethyl cellulose, and the coating amount is 5g/cm2(ii) a b4, performing illumination treatment on the coated particles for 5 hours to obtain the vermiculite composite activated carbon, wherein the illumination intensity is 8W/cm 2.
And (3) before denitrifying bacteria are added into the anoxic tank in the step (2), electrifying the tourmaline particles for 4min at an electrifying voltage of 0.4V.
In the embodiment, the average COD content in the inlet water of the municipal sewage is 421.3mg/L, the average ammonia nitrogen content is 35.7mg/L, the average total nitrogen content is 41.7mg/L, and the total phosphorus content is 5.3mg/L, after treatment, the COD content of the outlet water is 34.2mg/L, the ammonia nitrogen content is 2.3mg/L, the total nitrogen content is 10.1mg/L, and the total phosphorus content is 0.2mg/L, which reaches the first-level A standard of pollutant discharge Standard of municipal Sewage treatment plant.
In summary, the invention has the following advantages:
1. the method solves the difficulty of the existing A2O treatment process, effectively promotes the treatment of denitrifying bacteria by using the tourmaline particles with the shell-core structure, greatly improves the treatment efficiency of nitrate radicals, simultaneously improves the treatment capacity of the nitrate radicals, and does not need subsequent reflux treatment.
2. According to the invention, activated carbon amplification can be formed by using vermiculite composite activated carbon, so that the activated carbon adsorption effect is ensured, and the activated carbon is tiled and expanded, so that the action range of the activated carbon is enlarged, and the treatment effect is improved.
3. According to the invention, the tourmaline particles are electrified to be oxidized before bacteria are added, so that internal nitrate radicals are homogenized, the bearing pressure of post-treatment is reduced, the treatment efficiency is improved, and the electrified tourmaline particles can form an activation effect.
It should be understood that the detailed description of the invention is merely illustrative of the invention and is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (6)
1. A dephosphorization and denitrification integrated A2O process is characterized in that: the method comprises the following steps:
step 1, removing impurities: removing impurities from the wastewater to be treated, filtering, adjusting the pH value to 6-8,
step 2, anoxic treatment: discharging the waste water after impurity removal into an anoxic tank, and performing nitrate radical conversion treatment of an internal circulation system by using denitrifying bacteria in the tank, wherein tourmaline particles are fixed in the anoxic tank; the tourmaline particles take titanium dioxide as a shell and tourmaline powder as an inner core to form a shell-core structure;
step 3, anaerobic treatment: introducing the wastewater after the anoxic treatment into an anaerobic tank, adding a composite carbon source for circulating anaerobic treatment for 2-4h, removing part of BOD, and performing denitrification reaction on part of nitrogen-containing compounds;
step 4, aerobic treatment: dissolving the wastewater after the anaerobic treatment into an aerobic tank, and carrying out aeration dephosphorization treatment, wherein the dephosphorization adopts microorganism dephosphorization, and the aeration treatment is matched in the microorganism dephosphorization process;
step 5, standing and precipitating the wastewater after the aerobic treatment, discharging the wastewater from the system in a form of phosphorus-rich sludge after precipitation and separation, and refluxing the residual sludge to an anoxic tank through a peristaltic pump;
and 6, directly discharging the precipitated wastewater after adsorption of the wastewater by activated carbon.
2. The integrated dephosphorization and denitrification A2O process according to claim 1, wherein: and (3) before denitrifying bacteria are added into the anoxic tank in the step (2), electrifying the tourmaline particles for 3-5min at the electrifying voltage of 0.2-0.5V.
3. The integrated dephosphorization and denitrification A2O process according to claim 1, wherein: the composite carbon source in the step 3 comprises C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol.
4. The integrated dephosphorization and denitrification A2O process according to claim 1, wherein: the gas velocity of the aeration treatment in the step 4 is 2-5 mL/min.
5. The integrated dephosphorization and denitrification A2O process according to claim 1, wherein: and the activated carbon in the step 5 is vermiculite composite activated carbon.
6. The integrated dephosphorization and denitrification A2O process according to claim 1, wherein: the preparation method of the tourmaline particles comprises the following steps;
1, adding tourmaline powder into anhydrous ether, uniformly stirring, and performing ball milling and refining treatment to obtain slurry, wherein the mass ratio of the tourmaline powder to the anhydrous ether is 3:2-5, the uniform stirring speed is 2000r/min, the ball milling and refining temperature is 5-10 ℃, and the pressure is 0.4-0.7 MPa;
2, adding ethyl cellulose into the slurry, rapidly stirring to form viscous slurry, drying and granulating to form core particles, wherein the adding amount of the ethyl cellulose is 2-5% of the mass of the tourmaline powder, the rapid stirring speed is 1000-3000r/min, the temperature is 5-10 ℃, and the drying and granulating temperature is 40-50 ℃;
3, adding n-butyl titanate into ether, stirring uniformly to form titanium-ether liquid, then spraying the titanium-ether liquid on the surface of inner core particles, standing at constant temperature for 10-20min to obtain coated particles, wherein the concentration of n-butyl titanate in the titanium-ether liquid is 200-400g/L, the spraying amount is 20-40mL/min, and the titanium-ether liquid is treated by adopting a small amount of treatment for many times, and the temperature of the constant-temperature standing is 50-80 ℃;
a4, standing the coated particles in a reaction kettle for 20-30min at constant temperature, then blowing ultraviolet light for 2-5h to obtain the tourmaline particles, wherein the atmosphere in the reaction kettle is as follows: the volume of the water vapor accounts for 10-15%, the balance is nitrogen, and the constant-temperature standing temperature is 100-200 ℃; the blowing adopts air blowing, the temperature of the ultraviolet light is 200-250 ℃, and the light intensity is 2-6W/cm2。
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