CN113387439A - Deep denitrification system device and denitrification process for high ammonia nitrogen wastewater - Google Patents

Deep denitrification system device and denitrification process for high ammonia nitrogen wastewater Download PDF

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Publication number
CN113387439A
CN113387439A CN202110535458.7A CN202110535458A CN113387439A CN 113387439 A CN113387439 A CN 113387439A CN 202110535458 A CN202110535458 A CN 202110535458A CN 113387439 A CN113387439 A CN 113387439A
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denitrification
wastewater
water inlet
water
reactor
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陆立海
夏兴良
林宏飞
李坤
农斌
王志洪
喻来波
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Guangxi Bossco Environmental Protection Technology Co Ltd
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Guangxi Bossco Environmental Protection Technology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • C02F3/286Anaerobic digestion processes including two or more steps
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • C02F3/307Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/20Nature of the water, waste water, sewage or sludge to be treated from animal husbandry

Abstract

The invention discloses a deep denitrification system device for high ammonia nitrogen wastewater, which comprises a nitrification reactor, a denitrification anaerobic reactor and a denitrification biological filter, wherein a water inlet of the nitrification reactor is connected with a water inlet pump, a water outlet of the nitrification reactor is connected with a water outlet pump, the water outlet pump is communicated with the denitrification anaerobic reactor, square anaerobic ammonium oxidation bacteria embedded body suspension filler is added in the denitrification anaerobic reactor, a circulating water inlet area, a biological reaction area and a water outlet area are arranged in the denitrification biological filter, the circulating water inlet area is communicated with the biological reaction area, and a pipeline with a circulating pump is arranged at the bottom of the circulating water inlet area and is communicated with a water inlet of the denitrification anaerobic reactor. The system device and the process thereof have the effects of strong adaptability, no need of precise aeration, organic load impact resistance, low dissolved oxygen influence, high denitrification efficiency and the like when the high-ammonia-nitrogen wastewater is treated, and the total nitrogen of the effluent meets the discharge standard.

Description

Deep denitrification system device and denitrification process for high ammonia nitrogen wastewater
Technical Field
The invention relates to the technical field of biological sewage treatment and denitrification, in particular to a deep denitrification system device and a denitrification process for high ammonia nitrogen wastewater.
Background
The high-concentration ammonia nitrogen wastewater mainly comes from the industries of garbage percolate, sludge fermentation liquor, monosodium glutamate production, chemical fertilizer production, livestock and poultry breeding and the like. The excessive discharge of nitrogen in the wastewater is one of the main reasons for water eutrophication and environmental pollution. The current denitrification technology for sewage mainly comprises a physical method, a chemical method and a biological method, and relatively speaking, the biological denitrification technology is the most economical and efficient and is widely applied. But for high-concentration ammonia nitrogen wastewater, the concentration is high, the components are complex, and the conventional organisms are inhibited or treated by adding a large amount of carbon sources, so that the limitation is caused.
The discovery of autotrophic anammox bacteria provides a new direction for the biological treatment method of high-concentration ammonia nitrogen wastewater, but anaerobic anammox bacteria have strict requirements on the ratio of nitrite nitrogen to ammonia nitrogen in the incoming water. Therefore, the technical field develops shortcut nitrification based on anaerobic ammonium oxidation bacteria, and forms various denitrification combined processes such as shortcut nitrification-anaerobic ammonium-oxygen oxidation, semi-shortcut nitrification-anaerobic ammonium oxidation and the like. However, these combined processes also often have the following problems: (1) the short-cut nitrification process section needs strict DO control and accurate aeration, and is influenced by an organic carbon source of incoming water, and the excessive aeration or insufficient carbon source can directly cause the generation of nitrate nitrogen in short-cut nitrification effluent; (2) anaerobic ammonia oxidizing bacteria are greatly influenced by dissolved oxygen of incoming water and inhibition of an organic carbon source, and have weak adaptability, and meanwhile, nitrite nitrogen and ammonia nitrogen in the incoming water are unbalanced in proportion, so that unsatisfactory denitrification is caused; (3) the pure anaerobic ammonia oxidation denitrification of the incoming water which meets the proportion of nitrate nitrogen and ammonia nitrogen is incomplete, the effluent still contains about 11 percent of nitrate nitrogen, and the method is also one of the reasons for causing the total nitrogen of the effluent to not reach the standard.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the deep denitrification system device and the denitrification process for the high ammonia-nitrogen wastewater, which have the advantages of strong adaptability, no need of accurate aeration, resistance to organic load impact, low influence of dissolved oxygen, high denitrification efficiency and capability of meeting the discharge standard of total nitrogen in effluent.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the utility model provides a degree of depth denitrogenation system device of high ammonia-nitrogen concentration waste water, its characterized in that, including nitration reactor, denitrogenation anaerobic reactor, denitrification biological filter, the water inlet of nitration reactor is connected with the intake pump, and the delivery port department of this nitration reactor is connected with out the water pump, go out water pump intercommunication denitrogenation anaerobic reactor, it packs to add the cubic anaerobic ammonium oxidation fungus embedding body suspension of square in the denitrogenation anaerobic reactor, be equipped with circulation intake zone, biological reaction district and play water zone in the denitrification biological filter, this denitrogenation anaerobic reactor and the circulation intake zone intercommunication of denitrification biological filter, circulation intake zone and biological reaction district intercommunication, the bottom in this circulation intake zone sets up the pipeline that has the circulating pump and the water inlet intercommunication of denitrogenation anaerobic reactor.
Further, the denitrification anaerobic reactor comprises a water inlet, a water outlet device, a solid-liquid separator, a gas-solid separator, a positive and negative pressure protector, a communicating pipe and a circulating pump, wherein the solid-liquid separator is positioned at the bottom of the denitrification anaerobic reactor and is connected with the gas-solid separator positioned at the upper part of the denitrification anaerobic reactor; the water outlet device is connected with the upper right part of the solid-liquid separator through a communicating pipe; and a positive and negative pressure protector is arranged at the top of the denitrification anaerobic reactor.
Further, the solid-liquid separator is a closed hollow shell, wherein the top of the hollow shell is communicated with the solid-liquid separator, and the bottom of the hollow shell is provided with a sludge discharge pipe.
Furthermore, a plurality of layers of filter plates are arranged in the gas-liquid separator, so that the water entering from the gas-liquid separator can travel to the gas-liquid separator and filter flocculent sludge in the water after passing through the filter plates layer by layer.
Furthermore, the water inlet of the denitrification biological filter is arranged at the upper part of the water inlet area, an upflow channel is arranged between the water inlet area and the water outlet area to guide the water in the water inlet area into the water outlet area, and an upflow channel is also arranged at the water outlet of the water outlet area.
The deep denitrification process of the high ammonia nitrogen wastewater comprises the following steps:
(1) nitration reaction: the main stream wastewater enters a short-cut nitrification reactor through a main stream wastewater inlet pump to carry out short-cut nitrification reaction, non-precise continuous timing aeration is adopted in the short-cut nitrification reactor, the hydraulic retention time is controlled for 4.5-6 hours, the produced wastewater containing nitrate nitrogen and nitrite nitrogen flows out through a water outlet pump, and forms mixed wastewater with side stream wastewater and incoming water of a circulating water inlet area to enter the high-efficiency denitrification anaerobic reactor together through a water inlet;
(2) and (3) denitrification reaction: in the liquid phase in the efficient denitrification anaerobic reactor, denitrifying bacteria perform short-range denitrification reaction on organic matters in the side stream wastewater and nitrate nitrogen in the circulating water of the short-range nitrification reactor effluent and circulating water inlet area to convert the organic matters into nitrite nitrogen, and the nitrite nitrogen further performs anaerobic ammoxidation reaction on the solid-liquid interface of the anaerobic ammonia oxidizing bacteria embedded body suspension filler with ammonia nitrogen in the side stream wastewater to convert the nitrite nitrogen into nitrogen;
(3) solid-liquid separation: after the mixed wastewater is subjected to high-efficiency denitrification reaction in the high-efficiency denitrification anaerobic reactor, the mixed wastewater is separated by the solid-liquid separator and reaches the water outlet device through the communicating pipe, the outlet water of the water outlet device enters a circulating water inlet area at the front section of the denitrification biological filter, and the generated nitrogen passes through the gas-solid separator and then is directly discharged by the positive and negative pressure protector;
(4) and (3) discharging wastewater: the wastewater in the circulating water inlet area is connected to a water inlet through a circulating pump to perform partial circulating water inlet, part of the wastewater enters the biological reaction area through the upflow channel to perform denitrification to remove residual nitrate nitrogen in the water, and finally the wastewater passes through the water outlet area to be discharged after reaching the standard.
Further, the main stream wastewater and the side stream wastewater are both derived from original high ammonia nitrogen wastewater, the flow ratio of the main stream wastewater and the side stream wastewater is 2-3, and the ammonia nitrogen concentration of the original high ammonia nitrogen wastewater is 50-4000 mg/L.
Furthermore, the hydraulic retention time in the high-efficiency denitrification anaerobic reactor is 6-12h, the reaction temperature is 30-38 ℃, and the addition amount of the suspended filler of the anaerobic ammonium oxidation bacteria embedding body accounts for 5-20% by volume.
Further, in the step (4), the hydraulic retention time of the biological reaction zone is 4.5-6 h.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) the short-cut nitrification process section of the invention adopts non-precise continuous timing aeration, has wide requirement range for the content of the organic carbon source of the incoming water, and even if excessive aeration or insufficient carbon source causes the short-cut nitrification effluent to contain ammonia nitrogen and nitrate nitrogen, the total denitrification performance of the system is not influenced.
(2) The wastewater discharged from the water circulation tank is circularly diluted and enters the high-efficiency denitrification anaerobic reactor together with the discharged water of the short-cut nitrification process section and the side stream wastewater, so that the aim of diluting the dissolved oxygen in the incoming water can be fulfilled, and the influence of the dissolved oxygen on anaerobic ammonium oxidation bacteria in the system is reduced;
(3) the anaerobic ammonium oxidation bacteria are added into the efficient denitrification anaerobic reactor in the form of square embedding body suspension filler with large specific surface area, so that the impact load of the anaerobic ammonium oxidation bacteria on dissolved oxygen of incoming water and an organic carbon source is improved.
(4) In the invention, denitrifying bacteria in a liquid phase in the efficient denitrification anaerobic reactor can simultaneously utilize an organic carbon source of side flow wastewater and nitrate nitrogen generated by short-cut nitrification and anaerobic ammonia oxidation to carry out short-cut denitrification to generate nitrite nitrogen, and the nitrite nitrogen further generates anaerobic ammonia oxidation with ammonia nitrogen in the side flow wastewater on a solid-liquid interface of the anaerobic ammonia oxidation bacteria inclusion suspension filler, so that the denitrification load efficiency is improved, and the purpose of deep and efficient denitrification of a system is realized;
(5) the denitrification biological filter is arranged at the tail end of the anaerobic reactor, so that residual nitrate nitrogen in the effluent of anaerobic ammoxidation in the high-efficiency denitrification anaerobic reactor is further removed, and the final effluent total nitrogen of the whole system is ensured to be discharged after reaching the standard.
(6) The high-efficiency denitrification anaerobic reactor adopts corrosion-resistant pp parts, the service life of equipment can be prolonged, and meanwhile, the bottom of the reactor is provided with solid-liquid separation for bottom solid-liquid separation to obtain water, so that the defect that the conventional direct upper overflow drainage is lost or a water outlet pipeline is blocked due to floating of sludge caused by anaerobic ammonia oxidation bacteria gas production can be avoided.
Drawings
FIG. 1 is a schematic view of a device of an advanced denitrification system for high ammonia nitrogen wastewater according to the application.
In the drawings: 1. a nitration reactor; 1.1, a water inlet pump; 1.2, a water outlet pump; 2. a high-efficiency denitrification anaerobic reactor; 2.1 water inlet; 2.2 water outlet device; 2.3, a solid-liquid separator; 2.4, a gas-solid liquid separator; 2.5 positive and negative pressure protector; 2.6, suspending filler of the anaerobic ammonium oxidation bacteria embedding body; 2.7, communicating pipes; 2.8, a circulating pump; 2.9, a flow measuring wastewater inlet pump; 3. a denitrification biological filter; 3.1, circulating a water inlet area; 3.2, an upflow channel; 3.3, a biological reaction zone; 3.4, a water outlet area.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As shown in fig. 1, an advanced nitrogen removal system device for high ammonia nitrogen wastewater comprises a nitrification reactor 1, a nitrogen removal anaerobic reactor 2 and a denitrification biological filter 3, wherein a water inlet of the nitrification reactor 1 is connected with a water inlet pump 1.1, a water outlet of the nitrification reactor 1 is connected with a water outlet pump 1.2, the water outlet pump 1.2 is communicated with the nitrogen removal anaerobic reactor 2, a square block-shaped anaerobic ammonium oxidation bacteria embedded body suspended filler 2.6 is added in the nitrogen removal anaerobic reactor 2, a circulating water inlet area 3.1, a biological reaction area 3.3 and a water outlet area 3.4 are arranged in the denitrification biological filter 3, the nitrogen removal anaerobic reactor 2 is communicated with the circulating water inlet area 3.1 of the denitrification biological filter 3, the circulating water inlet area 3.1 is communicated with the biological reaction area 3.3, and a pipeline with a circulating pump is arranged at the bottom of the circulating water inlet area 3.1 and is communicated with a water inlet of the nitrogen removal anaerobic reactor. Wherein a branch pipeline is arranged in front of the water inlet pump 1.1 and is provided with a flow measuring wastewater inlet pump 2.9, and the branch pipeline is communicated with a water inlet of the denitrification anaerobic reactor 2. Wherein the nitration reactor 1 is a short distance nitration reactor, and the denitrification anaerobic reactor 2 is a high-efficiency denitrification anaerobic reactor.
The denitrification anaerobic reactor 2 comprises a water inlet 2.1, a water outlet device 2.2, a solid-liquid separator 2.3, a gas-solid separator 2.4, a positive and negative pressure protector 2.5, a communicating pipe 2.7 and a circulating pump 2.8, wherein the solid-liquid separator 2.3 is positioned at the bottom of the denitrification anaerobic reactor 2 and is connected with the gas-solid separator 2.4 positioned at the upper part of the denitrification anaerobic reactor 2; the water outlet device 2.2 is connected with the upper right part of the solid-liquid separator 2.3 through a communicating pipe; the top of the denitrification anaerobic reactor 2 is provided with a positive and negative pressure protector 2.5.
Wherein the solid-liquid separator 2.3 is a hollow shell, and the top of the solid-liquid separator is communicated with the solid-liquid separator 2.4; a plurality of layers of filter plates are arranged in the gas-liquid separator 2.4, so that water entering from the gas-liquid separator can travel to the solid-liquid separator 2.3 and filter flocculent sludge in the water after passing through the filter plates layer by layer; the water inlet of the denitrification biological filter is arranged at the upper part of the water inlet area, an upflow channel is arranged between the water inlet area and the water outlet area to guide the water in the water inlet area into the water outlet area, and an upflow channel is also arranged at the water outlet of the water outlet area. The solid-liquid separator 2.3, the gas-liquid separator 2.4, the positive and negative pressure protector 2.5 and the communicating pipe 2.7 are all made of polypropylene materials.
The deep denitrification process of the high ammonia nitrogen wastewater comprises the following steps:
(1) nitration reaction: the main stream wastewater enters a short-cut nitrification reactor through a main stream wastewater inlet pump to carry out short-cut nitrification reaction, non-precise continuous timing aeration is adopted in the short-cut nitrification reactor 1, the hydraulic retention time is controlled for 4.5-6 hours, the produced wastewater containing nitrate nitrogen and nitrite nitrogen flows out through a water outlet pump, and forms mixed wastewater with side stream wastewater and incoming water of a circulating water inlet area to enter the high-efficiency denitrification anaerobic reactor together through a water inlet;
(2) and (3) denitrification reaction: in the liquid phase in the efficient denitrification anaerobic reactor 2, denitrifying bacteria perform short-range denitrification reaction on organic matters in the side stream wastewater and nitrate nitrogen in the circulating water of the short-range nitrification reactor 1 outlet water and the circulating water inlet area to convert the organic matters into nitrite nitrogen, and the nitrite nitrogen further performs anaerobic ammoxidation reaction on a solid-liquid interface of the anaerobic ammonia oxidizing bacteria embedded body suspension filler 2.6 with ammonia nitrogen in the side stream wastewater to convert the nitrite nitrogen into nitrogen;
(3) solid-liquid separation: after the mixed wastewater is subjected to high-efficiency denitrification reaction in the high-efficiency denitrification anaerobic reactor 2, the mixed wastewater is separated by a solid-liquid separator 2.3 and reaches a water outlet device through a communicating pipe, the outlet water of the water outlet device enters a circulating water inlet area at the front section of the denitrification biological filter, and the generated nitrogen passes through the gas-liquid separator and then is directly discharged by a positive-negative pressure protector;
(4) and (3) discharging wastewater: the wastewater in the circulating water inlet area is connected to a water inlet through a circulating pump to perform partial circulating water inlet, part of the wastewater enters the biological reaction area through the upflow channel to perform denitrification to remove residual nitrate nitrogen in the water, the hydraulic retention time of the biological reaction area is 4.5-6h, and finally the effluent is discharged through the effluent area to reach the standard.
The main stream wastewater and the side stream wastewater are both derived from original high ammonia nitrogen wastewater, the flow ratio of the main stream wastewater and the side stream wastewater is 2-3, and the ammonia nitrogen concentration of the original high ammonia nitrogen wastewater is 50-4000 mg/L; the hydraulic retention time in the high-efficiency denitrification anaerobic reactor is 6-12h, the reaction temperature is 30-38 ℃, and the addition amount of the suspended filler of the anaerobic ammonium oxidation bacteria inclusion body is 5-20% by volume.
Example 1 treatment of feces and urine from livestock and poultry farms
(1) The original high ammonia nitrogen wastewater is divided into main stream wastewater and side stream wastewater, and the flow ratio of the main stream wastewater to the side stream wastewater is 2.5;
(2) main stream wastewater enters a short-cut nitrification reactor 1 through a main stream wastewater inlet pump 1.1 to carry out short-cut nitrification reaction, non-precise continuous timing aeration is adopted in the short-cut nitrification reactor, the hydraulic retention time is controlled for 6 hours, the produced wastewater containing nitrate nitrogen and nitrite nitrogen flows out through a water outlet pump 1.2, and forms mixed wastewater together with side stream wastewater and incoming water of a circulating water inlet area 3.1 to enter a high-efficiency denitrification anaerobic reactor 2 through a water inlet 2.1, denitrifying bacteria in a liquid phase in the high-efficiency denitrification anaerobic reactor 2 utilize organic matters in the side stream wastewater, the nitrate nitrogen in the outlet water of the short-cut nitrification reactor and the circulating water of the circulating water inlet area 3.1 to carry out short-cut denitrification reaction to be converted into nitrite nitrogen, the nitrite nitrogen further carries out anaerobic ammoxidation reaction with ammonia nitrogen in the side stream wastewater on a solid-liquid interface of an anaerobic ammonia oxidation bacteria embedding body suspension filler 2.6 to be converted into nitrogen, the hydraulic retention time in the high-efficiency denitrification anaerobic reactor 2 is controlled to be 12h, the reaction temperature is 36 ℃, the anaerobic ammonium oxidation bacteria embedding body suspension filler 2.6 is in a square shape, and the addition amount accounts for 15% by volume.
(3) After the mixed wastewater is subjected to the high-efficiency denitrification reaction in the high-efficiency denitrification anaerobic reactor 2, the mixed wastewater is separated by a solid-liquid separator 2.3 and reaches a water outlet device 2.2 through a communicating pipe 2.7, the outlet water of the water outlet device 2.2 enters a circulating water inlet area 3.1 at the front section of the denitrification biological filter 3, and the generated nitrogen is separated by a gas-solid separator 2.4 and then is directly discharged by a positive-negative pressure protector 2.5;
(4) the wastewater in the circulating water inlet area is connected to a water inlet 2.1 through a circulating pump 2.8 to perform partial circulating water inlet, part of the wastewater enters a biological reaction area 3.3 through an upflow channel 3.2 to perform denitrification to remove residual nitrate nitrogen in water, and finally the wastewater passes through a water outlet area 3.4 to be discharged after reaching the standard, and the hydraulic retention time of the biological reaction area 3.4 is controlled to be 6 hours.
The denitrification performance of the system device and the process thereof is investigated by taking the wastewater and biogas slurry in a certain livestock and poultry breeding park as a treatment object.
Experiments show that when the ammonia nitrogen of the inlet water is 600-.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims (9)

1. The utility model provides a degree of depth denitrogenation system device of high ammonia-nitrogen concentration waste water, its characterized in that, including nitration reactor, denitrogenation anaerobic reactor, denitrification biological filter, the water inlet of nitration reactor is connected with the intake pump, and the delivery port department of this nitration reactor is connected with out the water pump, go out water pump intercommunication denitrogenation anaerobic reactor, it packs to add the cubic anaerobic ammonium oxidation fungus embedding body suspension of square in the denitrogenation anaerobic reactor, be equipped with circulation intake zone, biological reaction district and play water zone in the denitrification biological filter, this denitrogenation anaerobic reactor and the circulation intake zone intercommunication of denitrification biological filter, circulation intake zone and biological reaction district intercommunication, the bottom in this circulation intake zone sets up the pipeline that has the circulating pump and the water inlet intercommunication of denitrogenation anaerobic reactor.
2. The deep denitrification system device for high ammonia nitrogen wastewater as claimed in claim 1, wherein the denitrification anaerobic reactor comprises a water inlet, a water outlet, a solid-liquid separator, a gas-liquid separator, a positive and negative pressure protector, a communicating pipe and a circulating pump, the solid-liquid separator is positioned at the bottom of the denitrification anaerobic reactor and is connected with the gas-liquid separator positioned at the upper part of the denitrification anaerobic reactor; the water outlet device is connected with the upper right part of the solid-liquid separator through a communicating pipe; and a positive and negative pressure protector is arranged at the top of the denitrification anaerobic reactor.
3. The device of claim 2, wherein the solid-liquid separator is a closed hollow shell, the top of the hollow shell is communicated with the solid-liquid separator, and the bottom of the hollow shell is provided with a sludge discharge pipe.
4. The apparatus of claim 3, wherein the solid-liquid separator is provided with a plurality of inclined plates, such that water entering the solid-liquid separator passes through the inclined plates to filter and precipitate flocculent sludge in the water, and then is discharged through the sludge discharge pipe.
5. The device of claim 1, wherein the water inlet of the denitrification biological filter is arranged at the upper part of the water inlet area, an upflow channel is arranged between the water inlet area and the water outlet area to guide the water in the water inlet area into the water outlet area, and an upflow channel is also arranged at the water outlet of the water outlet area.
6. The deep denitrification process of the high ammonia nitrogen wastewater is characterized by comprising the following steps:
(1) nitration reaction: the main stream wastewater enters a short-cut nitrification reactor through a main stream wastewater inlet pump to carry out short-cut nitrification reaction, non-precise continuous timing aeration is adopted in the short-cut nitrification reactor, the hydraulic retention time is controlled for 4.5-6 hours, the produced wastewater containing nitrate nitrogen and nitrite nitrogen flows out through a water outlet pump, and forms mixed wastewater with side stream wastewater and incoming water of a circulating water inlet area to enter the high-efficiency denitrification anaerobic reactor together through a water inlet;
(2) and (3) denitrification reaction: in the liquid phase in the efficient denitrification anaerobic reactor, denitrifying bacteria perform short-range denitrification reaction on organic matters in the side stream wastewater and nitrate nitrogen in the circulating water of the short-range nitrification reactor effluent and circulating water inlet area to convert the organic matters into nitrite nitrogen, and the nitrite nitrogen further performs anaerobic ammoxidation reaction on the solid-liquid interface of the anaerobic ammonia oxidizing bacteria embedded body suspension filler with ammonia nitrogen in the side stream wastewater to convert the nitrite nitrogen into nitrogen;
(3) solid-liquid separation: after the mixed wastewater is subjected to high-efficiency denitrification reaction in the high-efficiency denitrification anaerobic reactor, the mixed wastewater is separated by the solid-liquid separator and reaches the water outlet device through the communicating pipe, the outlet water of the water outlet device enters a circulating water inlet area at the front section of the denitrification biological filter, and the generated nitrogen passes through the gas-solid separator and then is directly discharged by the positive and negative pressure protector;
(4) and (3) discharging wastewater: the wastewater in the circulating water inlet area is connected to a water inlet through a circulating pump to perform partial circulating water inlet, part of the wastewater enters the biological reaction area through the upflow channel to perform denitrification to remove residual nitrate nitrogen in the water, and finally the wastewater passes through the water outlet area to be discharged after reaching the standard.
7. The process of claim 6, wherein the main stream wastewater and the side stream wastewater are both derived from original high ammonia nitrogen wastewater, the flow ratio of the main stream wastewater to the side stream wastewater is 2-3, and the ammonia nitrogen concentration of the original high ammonia nitrogen wastewater is 50mg/L-4000 mg/L.
8. The deep denitrification process of high ammonia nitrogen wastewater according to claim 6, characterized in that the hydraulic retention time in the high-efficiency denitrification anaerobic reactor is 6-12h, the reaction temperature is 30-38 ℃, and the addition amount of the suspended filler of the anaerobic ammonia oxidizing bacteria inclusion is 5-20% by volume.
9. The process of claim 6, wherein in the step (4), the hydraulic retention time of the biological reaction zone is 4.5-6 h.
CN202110535458.7A 2021-05-17 2021-05-17 Deep denitrification system device and denitrification process for high ammonia nitrogen wastewater Pending CN113387439A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116534988A (en) * 2023-07-06 2023-08-04 山东纯江环境科技有限公司 Process for removing nitrate nitrogen from surface water

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Application publication date: 20210914