CN113104966B - Efficient autotrophic nitrogen removal treatment method for urea wastewater - Google Patents

Efficient autotrophic nitrogen removal treatment method for urea wastewater Download PDF

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CN113104966B
CN113104966B CN202110243805.9A CN202110243805A CN113104966B CN 113104966 B CN113104966 B CN 113104966B CN 202110243805 A CN202110243805 A CN 202110243805A CN 113104966 B CN113104966 B CN 113104966B
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urea
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wastewater
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CN113104966A (en
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汪晓军
陈振国
陈永兴
胡浩林
邓翠兰
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South China University of Technology SCUT
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The invention belongs to the technical field of urea wastewater treatment, and discloses a high-efficiency autotrophic nitrogen removal treatment method for urea wastewater. The method comprises the following steps: 1) inoculating activated sludge into a reactor, introducing urea wastewater to be treated, aerating, and performing acclimation culture in a closed aeration mode, wherein the acclimation culture is successful when the urea removal rate reaches 95% or more and the total nitrogen removal rate reaches 75% or more; when the acclimatization culture is carried out by aeration, the wastewater in the reactor is internally circulated; the activated sludge is anaerobic ammonium oxidation sludge or a mixture of urea hydrolysis sludge, nitrification sludge and anaerobic ammonium oxidation sludge; 2) continuously introducing the urea wastewater to be treated into the reactor successfully cultured in the step 1), controlling the hydraulic retention time, adjusting the aeration amount, reacting, discharging water, and realizing the efficient autotrophic nitrogen removal of the urea wastewater. The method realizes autotrophic denitrification treatment of the urea wastewater with medium and high concentration, thoroughly converts the urea in the wastewater into nitrogen to be removed, and has high urea removal rate.

Description

Efficient autotrophic nitrogen removal treatment method for urea wastewater
Technical Field
The invention belongs to the technical field of environmental protection urea wastewater treatment, relates to a biological denitrification treatment method for urea wastewater, and particularly relates to a high-efficiency autotrophic denitrification treatment method for urea wastewater.
Technical Field
The fields of urea production process, printing and dyeing printing process and the like all discharge a large amount of high-concentration urea wastewater. Since urea is very easy to be aminated into ammonia nitrogen, a large amount of urea waste water will aggravate the nitrogen pollution degree of the water body and destroy the environmental quality of the water body. Currently, common urea wastewater treatment methods include thermal hydrolysis, chemical oxidation, urease hydrolysis, biological treatment, and the like. The thermal hydrolysis and the chemical oxidation need to consume a large amount of energy, have high operation cost, are suitable for high-concentration urea wastewater, and are used for recovering ammonia and carbon dioxide. Since the isolation and purification technology of urease is still in the laboratory research stage, the use of urease hydrolysis method for treating urea wastewater is not mature. The biological treatment method has the advantages of more economical and reliable treatment of the urea wastewater. Both the anaerobic biological method and the aerobic biological method convert urea in the wastewater into ammonia nitrogen and carbon dioxide through the action of microorganisms. The ammonia nitrogen is a typical water nitrogen pollutant, so that the urea wastewater is difficult to completely treat by using a common biological hydrolysis method at present, and the nitrogen pollution of the water body can be avoided only by converting the urea in the wastewater into another pollutant, namely the ammonia nitrogen, and further treating the converted ammonia nitrogen. In addition, the nitrogen content of the urea is about 46.67 percent, namely a large amount of ammonia nitrogen is generated after the conventional biological treatment of the urea, so that the urea wastewater is converted into high-concentration ammonia nitrogen wastewater after the conventional biological treatment, and the treatment difficulty and the treatment cost of the urea wastewater are increased. Therefore, a biological treatment method capable of thoroughly and harmlessly treating urea is urgently needed to synchronously remove urea, ammonia nitrogen and total nitrogen in the wastewater.
Disclosure of Invention
In order to solve the limitation that the conventional biological treatment method is used for treating the urea wastewater and realize economic and efficient denitrification treatment of the urea wastewater, the invention aims to provide a high-efficiency autotrophic denitrification method for the urea wastewater. The invention can realize the whole-process autotrophic nitrogen removal of the medium-high concentration urea wastewater by the wastewater biological treatment reactor which simultaneously collects three nitrogen conversion processes of urea hydrolysis, ammonia oxidation and anaerobic ammonia oxidation, and can remove most of the urea in the wastewater by converting the urea into nitrogen, and no medicament is required to be added in the whole treatment process, so the treatment efficiency is high, and the treatment cost is low.
The purpose of the invention is realized by the following technical scheme:
a high-efficiency autotrophic nitrogen removal treatment method for urea wastewater comprises the following steps:
1) inoculating activated sludge into a wastewater biological treatment reactor, introducing urea wastewater to be treated, aerating, and performing acclimation culture in a closed aeration mode, wherein when the urea removal rate reaches 95% or more and the total nitrogen removal rate reaches 75% or more, the acclimation culture in the reactor is successful; when the domestication culture of the aeration is carried out, the wastewater in the reactor is subjected to internal circulation, and particularly the wastewater at the water outlet end and the wastewater at the water inlet end in the reactor are subjected to internal circulation through a circulating device;
2) continuously introducing the urea wastewater to be treated into the reactor successfully cultured in the step 1), controlling the hydraulic retention time, adjusting the aeration rate to control the dissolved oxygen concentration in the reactor, reacting, and discharging water to realize the high-efficiency autotrophic nitrogen removal of the urea wastewater.
In the step 2), the concentration of urea and total nitrogen in the effluent is gradually reduced along with the reaction, the final urea removal rate can be stabilized to be more than 95%, the total nitrogen removal rate can be stabilized to be more than 80%, and the efficient autotrophic nitrogen removal of the urea wastewater is realized.
The activated sludge in the step 1) is anaerobic ammonium oxidation sludge or a mixture of urea hydrolysis sludge, nitrification sludge and anaerobic ammonium oxidation sludge; the activated sludge is domesticated mature activated sludge;
when the activated sludge is a mixture of urea hydrolyzed sludge, nitrified sludge and anaerobic ammonium oxidation sludge, the volume ratio of the urea hydrolyzed sludge to the nitrified sludge to the anaerobic ammonium oxidation sludge is (0.5-2) to (1-4).
When the activated sludge is mixed sludge, the concentration MLSS of the urea hydrolysis sludge is 2500-4000mg/L, the concentration MLSS of the nitrification sludge is 3000-4000mg/L, and the concentration MLSS of the anaerobic ammonia oxidation sludge is 1400-2500 mg/L.
When the activated sludge is the anaerobic ammonia oxidation sludge alone, the sludge concentration MLSS is 1500-4000 mg/L.
The urea wastewater to be treated in the step 1) refers to the wastewater with the urea concentration of 400-4000mg/L, and the adding amount of the urea wastewater is 1/8-1/2 of the volume of the reactor;
before aeration in the step 1), the concentration of urea in the mixture of the bioreactor is 200-600 mg/L, when the urea wastewater is added into the bioreactor, the concentration of urea is not within 200-600 mg/L, water is added, and the concentration of urea is adjusted to meet the requirement.
Or when the concentration of the urea in the urea waste water is higher (such as 600-4000 mg/L), water can be added to ensure that the concentration of the urea in the waste water is 200-800 mg/L.
The aeration conditions in the step 1): when the activated sludge is a mixture of urea hydrolysis sludge, nitrification sludge and anaerobic ammonium oxidation sludge, the concentration of dissolved oxygen is 1-6 mg/L; when the activated sludge is anaerobic ammonium oxidation sludge alone, the concentration of dissolved oxygen is 0.5-3 mg/L.
The inoculation amount of the activated sludge is 1/10-1/2 of the volume of the bioreactor.
The stuffy aeration time in the step 1) is 8-48 h;
the urea wastewater to be treated in the step 2) refers to the wastewater with the urea concentration of 400-4000 mg/L;
the hydraulic retention time in the step 2) is 4-24 h; the specific hydraulic retention time is related to the nitrogen load of the reactor, and the nitrogen volume load of the reactor is 1.2-2.0kgN/m 3 A day;
the concrete steps of the step 2) are that the urea wastewater to be treated is continuously introduced into the reactor successfully cultured in the step 1), the hydraulic retention time and the internal circulation are controlled, the hydraulic retention time and the internal circulation ratio are controlled, the aeration amount is adjusted to control the dissolved oxygen concentration in the reactor, the reaction is carried out, the water is discharged, and the high-efficiency autotrophic nitrogen removal of the urea wastewater is realized.
In the step 2), the internal circulation ratio is 5-20: 1;
the dissolved oxygen concentration in step 2): when the activated sludge is a mixture of urea hydrolysis sludge, nitrification sludge and anaerobic ammonium oxidation sludge, the concentration of dissolved oxygen is 1-6 mg/L; when the activated sludge is anaerobic ammonia oxidation sludge alone, the concentration of the activated sludge is 0.5-3 mg/L.
The principle is as follows: in the invention, mature activated sludge (anaerobic ammonium oxidation sludge or mixed sludge of urea hydrolysis sludge, nitrification sludge and ammonium oxidation sludge) is inoculated, a certain amount of urea wastewater is introduced, the reactor sludge is washed and maintained under the condition of low dissolved oxygen by combining internal circulation, after acclimation, the sludge in the reactor is gradually changed into sludge taking three bacteria of urea hydrolysis bacteria, ammonia oxidation bacteria and anaerobic ammonium oxidation bacteria as dominant microorganisms, and the system collects three functions of urea hydrolysis, ammonia oxidation, anaerobic ammonium oxidation and the like. After the urea wastewater to be treated enters a reactor, urea is firstly hydrolyzed by urea hydrolytic bacteria in sludge and converted into ammonia nitrogen and carbon dioxide; then, ammonia oxidizing bacteria convert part of ammonia nitrogen into nitrite nitrogen by taking carbon dioxide obtained by urea conversion as alkalinity; and finally, anaerobic ammonium oxidation bacteria in the sludge perform anaerobic ammonium oxidation reaction by using the residual ammonia nitrogen and nitrite nitrogen obtained by the conversion of the ammonium oxidation bacteria, and convert the nitrite nitrogen into nitrogen to be removed, so that the harmless treatment of the urea in the wastewater is realized. The invention realizes the synergistic effect of urea hydrolysis, ammonia oxidation and anaerobic ammonia oxidation, thereby achieving the aim of economically and efficiently removing urea and total nitrogen in one reactor.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention successfully couples three nitrogen conversion processes of urea hydrolysis, ammonia oxidation, anaerobic ammonia oxidation and the like, can realize the full-flow autotrophic nitrogen removal treatment of the medium-high concentration urea wastewater, and completely converts the urea in the wastewater into nitrogen to be removed;
(2) the method realizes the autotrophic denitrification treatment of the urea in the same reactor, does not need to add an additional medicament, has the technical advantages of high treatment efficiency, strong economy, stable treatment effect and the like, and can greatly reduce the treatment energy consumption and the treatment cost of the medium-high concentration urea wastewater.
Drawings
FIG. 1 is a schematic view of an apparatus for carrying out a process for the efficient autotrophic nitrogen removal treatment of urea-containing wastewater according to the present invention; 1-water storage device filled with urea wastewater, 2-water inlet pump, 3-bioreactor, 4-internal circulating pump, 5-air compressor, 6-aeration head, 7-water outlet, and 8-sludge layer in reactor.
Detailed Description
The present invention is further described below with reference to specific examples, but the embodiments of the present invention are not limited thereto.
FIG. 1 is a schematic view of an apparatus for carrying out a process for the efficient autotrophic nitrogen removal treatment of urea-containing wastewater according to the present invention. The device comprises a water storage device 1 and a bioreactor 3, wherein a water outlet of the water storage device 1 is connected with a water inlet end of the bioreactor 3 through a water inlet pump 2, an aeration head 6 is arranged at the bottom of the bioreactor 3, the aeration head 6 is connected with an air compressor 5, and a sludge layer 8 is arranged in the bioreactor 3; the upper end of the bioreactor 3 is provided with a water outlet 7; the device also comprises an internal circulation pump 4, and the wastewater at the upper end and the lower end of the bioreactor 3 is circulated by the internal circulation pump 4 (the wastewater at the water outlet end and the wastewater at the water inlet end in the reactor are internally circulated by the circulation pump).
As shown in fig. 1, after acclimation is completed, urea wastewater to be treated in a wastewater pool (water storage device) 1 is pumped into a bioreactor 3 through a water inlet pump 2, meanwhile, a large amount of effluent from the top end of the bioreactor is conveyed to a water inlet port under the action of an internal circulation pump 4, the effluent is mixed with the wastewater to be treated and then enters the bioreactor, an aeration head 6 generates a large amount of bubbles to provide oxygen for the bioreactor under the action of an air compressor 5, urea hydrolytic bacteria, ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria in a sludge layer 8 in the bioreactor exert synergistic effect to gradually convert urea, the urea is finally converted into nitrogen to be removed from the bioreactor, complete denitrification treatment of the urea wastewater is realized, and treated effluent is discharged through a water outlet 7.
The functional dominant bacteria in the sludge flocs of the sludge layer in the bioreactor comprise urea hydrolysis bacteria, ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria. After urea enters a reactor, the urea is firstly converted into ammonia nitrogen and carbon dioxide by urea hydrolytic bacteria under aerobic conditions; then, under the action of ammonia oxidizing bacteria, converting ammonia nitrogen into nitrite nitrogen by using oxygen; finally, the residual ammonia nitrogen and the nitrite nitrogen obtained by conversion are utilized by the anaerobic ammonium oxidation bacteria and are converted into nitrogen, so that the urea is completely removed from the wastewater.
Example 1
A high-efficiency autotrophic nitrogen removal treatment method for urea wastewater comprises the following steps:
(1) 500mL of domesticated mature anaerobic ammonium oxidation sludge (MLSS is 2000mg/L) is directly added into a 1L bioreactor for inoculation, 500mL of wastewater with the urea concentration of 400mg/L is introduced, aeration and internal circulation are started, the dissolved oxygen concentration is controlled to be 0.5mg/L, the reactor is subjected to closed aeration domestication culture, after 8 hours, the urea removal rate reaches 99.2%, the total nitrogen removal rate reaches 85.4%, and the reactor domestication culture is successful;
(2) continuously introducing wastewater with the urea concentration of 400mg/L into the step (1) to successfully cultureIn the reactor, the hydraulic retention time is controlled to be 5h, and the volume load of the inlet water nitrogen is about 1.92kgN/m 3 And on a day, controlling the concentration of dissolved oxygen in the reactor to be 0.5-0.8mg/L by adjusting the aeration rate, gradually reducing the concentrations of urea and total nitrogen in the effluent along with the reaction, and obviously improving the removal effect of the urea and the total nitrogen in the treated effluent after 3 days. The average urea removal rate is stabilized at 99.4 percent and the average total nitrogen removal rate is stabilized at 82.4 percent in the subsequent continuous 120-day operation process, so that the high-efficiency autotrophic nitrogen removal of the urea wastewater is realized.
Example 2
A high-efficiency autotrophic nitrogen removal treatment method for urea wastewater comprises the following steps:
(1) adding 800mL of domesticated mature anaerobic ammonia oxidation sludge (MLSS is 2400mg/L) into a 3L bioreactor for inoculation, introducing 500mL of wastewater with urea concentration of 1500mg/L and 1700mL of tap water, opening aeration and internal circulation, controlling the dissolved oxygen concentration to be 0.5mg/L, performing closed aeration domestication culture on the reactor, and after 16 hours, ensuring that the urea removal rate reaches 97.2%, the total nitrogen removal rate reaches 80.4%, and successfully performing domestication culture on the reactor;
(2) the wastewater with the urea concentration of 1500mg/L is continuously introduced into the reactor successfully cultured in the step (1), the hydraulic retention time is controlled to be 16h, the dissolved oxygen concentration in the reactor is controlled to be 1.0-1.5mg/L by adjusting the aeration rate, the urea and total nitrogen concentration in the treated effluent can be gradually reduced, the urea and total nitrogen removal effect in the treated effluent is remarkably improved after 8 days, the average urea removal rate is stabilized at 98.4% and the average total nitrogen removal rate is stabilized at 81.1% in the subsequent continuous 95-day operation process, and the high-efficiency autotrophic nitrogen removal of the urea wastewater is realized.
Example 3
A high-efficiency autotrophic nitrogen removal treatment method for urea wastewater comprises the following steps:
(1) pouring a mixture of 350mL of domesticated mature anaerobic ammonia oxidation sludge (MLSS is 3500mg/L) into a 2L bioreactor for inoculation, introducing 250mL of waste water with urea concentration of 4000mg/L and 1400mL of tap water, opening aeration and internal circulation, controlling the dissolved oxygen concentration to be 0.8mg/L, carrying out closed aeration domestication culture on the reactor, and after 24 hours, ensuring that the urea removal rate reaches 96.9%, the total nitrogen removal rate reaches 77.4%, and successfully domesticating and culturing the reactor;
(2) continuously introducing the wastewater with the urea concentration of 4000mg/L into the reactor successfully cultured in the step (1), controlling the hydraulic retention time to be 24h, controlling the dissolved oxygen concentration in the reactor to be 2.5-3.0mg/L by adjusting the aeration rate, finding that the concentrations of urea and total nitrogen in treated effluent are gradually reduced, obviously improving the removal effect of urea and total nitrogen in the treated effluent after 14 days, stabilizing the average removal rate of the urea at 98.1% and the average removal rate of the total nitrogen at 80.6% in the subsequent continuous 110-day operation process, and realizing the high-efficiency autotrophic nitrogen removal of the urea wastewater.
Example 4
A high-efficiency autotrophic nitrogen removal treatment method for urea wastewater comprises the following steps:
(1) pouring 200mL of anaerobic ammonia oxidation sludge (MLSS is 4000mg/L) into a 2L bioreactor for inoculation, introducing 500mL of wastewater with urea concentration of 800mg/L and 1300mL of tap water, opening aeration and internal circulation, controlling the dissolved oxygen concentration to be 0.8mg/L, performing closed aeration domestication culture on the reactor, and after 20 hours, ensuring that the urea removal rate reaches 99.2%, the total nitrogen removal rate reaches 82.4%, and successfully performing domestication culture on the reactor;
(2) continuously introducing the wastewater with the urea concentration of 800mg/L into the reactor successfully cultured in the step (1), controlling the hydraulic retention time to be 12h, controlling the dissolved oxygen concentration in the reactor to be 1.0-1.5mg/L by adjusting the aeration rate, finding that the concentrations of urea and total nitrogen in treated effluent are gradually reduced, obviously improving the removal effect of urea and total nitrogen in the treated effluent after 5 days, stabilizing the average removal rate of urea at 99.4% and the average removal rate of total nitrogen at 83.8% in the subsequent continuous 150-day operation process, and realizing the high-efficiency autotrophic nitrogen removal of the urea wastewater.
Example 5
A high-efficiency autotrophic nitrogen removal treatment method for urea wastewater comprises the following steps:
(1) directly mixing 50mL of domesticated mature urea hydrolysis sludge (MLSS-2500 mg/L), 50mL of nitrifying sludge (MLSS-3100 mg/L) and 100mL of anaerobic ammonia oxidation sludge (MLSS-1400 mg/L), adding the mixture into a 1L bioreactor for inoculation, introducing 500mL of wastewater with the urea concentration of 400mg/L, opening aeration and internal circulation, controlling the dissolved oxygen concentration to be 1.0-1.5mg/L, performing closed aeration domestication culture on the reactor, and after 8 hours, ensuring that the urea removal rate reaches 99.6%, the total nitrogen removal rate reaches 86%, and successfully performing domestication culture on the reactor;
(2) continuously introducing the wastewater with the urea concentration of 400mg/L into the reactor successfully cultured in the step (1), controlling the hydraulic retention time to be 4h, controlling the dissolved oxygen concentration in the reactor to be 1.0-1.5mg/L by adjusting the aeration amount, gradually reducing the concentrations of urea and total nitrogen in the effluent along with the reaction, and obviously improving the removal effect of the urea and the total nitrogen in the treated effluent after 3 days. The average urea removal rate is stabilized at 99.5 percent and the average total nitrogen removal rate is stabilized at 82.7 percent in the subsequent continuous 125-day operation process, so that the high-efficiency autotrophic nitrogen removal of the urea wastewater is realized.
According to the invention, mature urea hydrolysis sludge, mature nitrification sludge and mature ammonia oxidation sludge are inoculated, urea wastewater is introduced, the sludge in the reactor is washed by combining with internal circulation, and after acclimation, the sludge in the reactor is sequentially urea hydrolysis bacteria, ammonia oxidation bacteria and anaerobic ammonia oxidation bacteria from outside to inside. Thus being beneficial to removing nitrogen in the urea wastewater.
When the urea wastewater is continuously introduced into a reactor which is successfully domesticated and cultured, the internal circulation is started when the urea wastewater is treated, the wastewater at the upper end and the lower end in the reactor is subjected to the internal circulation, the hydraulic retention time and the internal circulation are controlled, the hydraulic retention time and the internal circulation ratio are controlled, the aeration amount is adjusted to control the dissolved oxygen concentration in the reactor, the reaction is carried out, the water is discharged, and the efficient autotrophic nitrogen removal of the urea wastewater is realized. The internal circulation ratio is 5-20: 1.

Claims (3)

1. A high-efficiency autotrophic nitrogen removal treatment method for urea wastewater is characterized by comprising the following steps: the method comprises the following steps:
1) inoculating activated sludge into a wastewater biological treatment reactor, introducing urea wastewater to be treated, aerating, tightly aerating, acclimating and culturing, and when the urea removal rate reaches 95% or more and the total nitrogen removal rate reaches 75% or more, successfully acclimating and culturing the reactor; when the acclimatization culture is carried out by aeration, the wastewater in the reactor is internally circulated; the activated sludge in the step 1) is anaerobic ammonia oxidation sludge or a mixture of urea hydrolysis sludge, nitrification sludge and anaerobic ammonia oxidation sludge; after acclimation, the sludge in the reactor is gradually changed into sludge taking three types of bacteria, namely urea hydrolysis bacteria, ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria, as dominant microorganisms, and three functions of urea hydrolysis, ammonia oxidation and anaerobic ammonia oxidation are gathered in the system;
2) continuously introducing the urea wastewater to be treated into the reactor successfully cultured in the step 1), controlling the hydraulic retention time, adjusting the aeration amount to control the dissolved oxygen concentration in the reactor, reacting, and discharging water to realize the high-efficiency autotrophic nitrogen removal of the urea wastewater;
the internal circulation in the step 1) refers to that the wastewater at the water outlet end and the wastewater at the water inlet end in the reactor are subjected to internal circulation through a circulating device;
when the activated sludge in the step 1) is a mixture of urea hydrolyzed sludge, nitrified sludge and anaerobic ammonium oxidation sludge, the volume ratio of the urea hydrolyzed sludge to the nitrified sludge to the anaerobic ammonium oxidation sludge is (0.5-2) to (1-4);
when the activated sludge is a mixture, the concentration MLSS of the urea hydrolysis sludge is 2500-4000mg/L, the concentration MLSS of the nitrification sludge is 3000-4000mg/L, and the concentration MLSS of the anaerobic ammonia oxidation sludge is 1400-2500 mg/L;
when the activated sludge is the anaerobic ammonia oxidation sludge alone, the sludge concentration MLSS is 1500-4000 mg/L;
the urea wastewater to be treated in the step 1) refers to the wastewater with the urea concentration of 400-4000 mg/L; the adding amount of the urea wastewater to be treated is 1/8-1/2 of the volume of the reactor;
the aeration conditions in the step 1): when the activated sludge is a mixture of urea hydrolysis sludge, nitrification sludge and anaerobic ammonium oxidation sludge, the concentration of dissolved oxygen is 1-6 mg/L; when the activated sludge is anaerobic ammonium oxidation sludge alone, the concentration of dissolved oxygen is 0.5-3 mg/L;
the stuffy aeration time in the step 1) is 8-48 h;
the urea wastewater to be treated in the step 2) refers to the wastewater with the urea concentration of 400-4000 mg/L;
the hydraulic retention time in the step 2) is 4-24 h; the specific hydraulic retention time is related to the nitrogen load of the reactor, and the nitrogen volume load of the reactor is 1.2-2.0kgN/m 3 The day is one.
2. The method for the high-efficiency autotrophic nitrogen removal treatment of urea wastewater according to claim 1, wherein: the concrete steps of the step 2) are that the urea wastewater to be treated is continuously introduced into the reactor successfully cultured in the step 1), the hydraulic retention time and the internal circulation are controlled, the hydraulic retention time and the internal circulation ratio are controlled, the aeration quantity is adjusted to control the dissolved oxygen concentration in the reactor, the reaction and the water outlet are carried out, and the high-efficiency autotrophic nitrogen removal of the urea wastewater is realized.
3. The method for the high-efficiency autotrophic nitrogen removal treatment of urea wastewater according to claim 1, wherein: the dissolved oxygen concentration in step 2): when the activated sludge is a mixture of urea hydrolysis sludge, nitrification sludge and anaerobic ammonium oxidation sludge, the concentration of dissolved oxygen is 1-6 mg/L; when the activated sludge is anaerobic ammonium oxidation sludge alone, the concentration of dissolved oxygen is 0.5-3 mg/L.
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