AU2021290368B1 - Device and method for advanced nitrogen removal based on complete nitrification coupled with endogenous partial-denitrification/anammox under low oxygen condition - Google Patents
Device and method for advanced nitrogen removal based on complete nitrification coupled with endogenous partial-denitrification/anammox under low oxygen condition Download PDFInfo
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- 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
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Abstract
A device and a method for advanced nitrogen removal based on complete
nitrification coupled with endogenous partial-denitrification/anammox under low
oxygen condition are provided. The device includes an municipal wastewater
5 tank, an anaerobic reactor and a low oxygen nitrogen removal reactor. Firstly,
municipal wastewater is pumped into the anaerobic reactor, and organic matter in
the wastewater is converted into endogenous to be stored in activated sludge, and
then, water is discharged from the anaerobic reactor in the form of activated
sludge and water mixture and enters the low oxygen nitrogen removal reactor with
10 symbiosis of anammox bacteria and complete nitrifying bacteria; a concentration
of dissolved oxygen is controlled by a controller to implement coexistence of
anammox bacteria and complete nitrifying bacteria under low oxygen conditions,
the endogenous is configured to achieve complete nitrification coupled with
endogenous partial-denitrification/anammox, so as to save energy, reduce
15 consumption and advanced nitrogen removal.
23
Description
1. Technical Field
[00011 The present disclosure generally relates to the field of wastewater
biological treatment, and especially relates to a device and a method for advanced
nitrogen removal based on complete nitrification coupled with endogenous
partial-denitrification/anammox under low oxygen condition.
2. Description of Related Art
[0002] Since complete nitrifying bacteria are discovered by two research
teams and published in ((Nature)) in 2015, the existence of complete nitrifying
bacteria has updated everyone's understanding of nitrification that has existed for
more than 100 years. At the end of the 19th century, Russian scientists isolated
two kinds of bacteria that can complete nitrification step by step, namely
ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB).
Although it has been proved in recent years that the complete nitrifying bacteria
has certain competitive advantages than AOB and NOB in microbial dynamics and
thermodynamics, long reaction path and low bacterial growth rate of the complete nitrifying bacteria may be reasons without being observed for so many years.
Since its launch of the complete nitrifying bacteria, its characteristics of low
energy consumption and low substrate concentration have attracted the attention of
many scientists, however, due to unclear physiological and biochemical
characteristics, there is no specific methods for achieving advanced nitrogen
removal using the complete nitrifying bacteria coupled with other microorganisms.
[00031 The technical problems to be solved: in view of the shortcomings of
the related art, the present disclosure relates to a device and a method for advanced
nitrogen removal based on complete nitrification coupled with endogenous
partial-denitrification/anammox under low oxygen condition which can be
expected to achieve advanced nitrogen removal under extreme low oxygen
conditions by using a combination that the organic carbon source is stored in
anaerobic stage, full nitrification under hypoxia conditions; and supply endogenous
to partial-denitrification for converting nitrate into nitrite, and then converting
nitrite and ammonium into nitrogen through anammox reaction; compared with
conventional nitrification and denitrification, partial-denitrification/anammox has
low oxygen consumption and low organic carbon source demand, at the same time,
because the complete nitrification and the partial-denitrification/anammox are simultaneously occurred, 100% nitrogen removal can be achieved in theory, and advanced nitrogen removal can be possible.
[00041 The technical solution adopted for solving technical problems of the
present disclosure is: a device for advanced nitrogen removal based on complete
nitrification coupled with partial-denitrification/anammox under low oxygen
condition includes an municipal wastewater tank, an anaerobic reactor and a low
oxygen nitrogen removal reactor; the municipal wastewater tank including a box, a
first overflow pipe, a vent pipe and an intake pump, both the first overflow pipe
and the vent pipe arranged on the box, and the inlet pump configured to transport
the wastewater in the municipal wastewater tank to the anaerobic reactor; the
anaerobic reactor including an anaerobic reaction vessel, an inlet valve, a first
stirrer and a second overflow pipe, the second overflow pipe arranged on the
anaerobic reaction vessel, and stirring blades of the first stirrer located inside the
anaerobic reaction vessel; the low oxygen nitrogen removal reactor including a low
oxygen nitrogen removal reaction vessel, a second stirrer, an aeration device, an air
compressor, a gas flowmeter, a controller, a third overflow pipe, an outlet valve, a
membrane module and a sludge return pump; the air compressor, the gas
flowmeter and the aeration device successively connected through pipelines, the
aeration device located inside the low oxygen nitrogen removal reaction vessel, the
controller connected with both a dissolved oxygen sensor and the air compressor; the controller configured to control the air compressor through a dissolved oxygen value of the dissolved oxygen sensor, when a concentration of the dissolved oxygen is greater than 0.07mg/L, the air compressor stopped to work, when the concentration of the dissolved oxygen is lower than 0.02mg/L, the air compressor starting to work; stirring blades of the second stirrer located inside the low oxygen nitrogen removal reaction vessel; the membrane module installed on an inner wall of the low oxygen nitrogen removal reaction vessel; and the municipal wastewater tank connected with an inlet pipe of the anaerobic reactor; the outlet pipe of the anaerobic reactor connected with the low oxygen nitrogen removal reaction vessel; the sludge reflux pump connected with all of the low oxygen nitrogen removal reaction vessel, the municipal wastewater tank and the anaerobic reactor through pipelines. The membrane module is used to discharge water; the present disclosure adopts the controller to control the dissolved oxygen in the low oxygen nitrogen removal reactor to ensure that the complete nitrifying bacteria can is perform nitrification, so that the anammox can't be inhibited by oxygen. The box of the municipal wastewater tank is connected with inlet pipes of the anaerobic reaction vessel of the anaerobic reactor through the inlet pump, and the water pump is used to transport the wastewater in the municipal wastewater tank to the anaerobic reactor; the outlet pipe of the anaerobic reactor is connected with the low oxygen nitrogen removal reaction vessel; the sludge reflux pump is connected with all the low oxygen nitrogen removal reaction vessel, the inlet pump of the municipal wastewater tank and the inlet valve of the anaerobic reactor through pipelines.
[00051 Wherein the membrane module is composed of a polyethylene
hollow fiber membrane, with an aperture diameter of the membrane fiber of 0.1
pm, so that microbial cells can be intercepted, and be unable to pass there through
to be stayed in the reactor, and a long sludge age of the reactor can be obtained.
Growth rates of the anammox bacteria and the complete nitrifying bacteria are
slow, so as to avoid low nitrogen removal efficiency that is caused by biomass
loss.
[00061 Wherein the membrane module is connected with a peristaltic pump
to keep a constant water level in a membrane bioreactor.
[00071 A method for advanced nitrogen removal based on complete
nitrification coupled with endogenous partial-denitrification/anammox under low
oxygen condition is applied to a device for advanced nitrogen removal based on
complete nitrification coupled with endogenous partial-denitrification/anammox
under the low oxygen condition, the device including an municipal wastewater
tank, an anaerobic reactor and a low oxygen nitrogen removal reactor; the
municipal wastewater tank including a box, a first overflow pipe, a vent pipe and
an intake pump, both the first overflow pipe and the vent pipe arranged on the box, and the inlet pump configured to transport the wastewater in the municipal wastewater tank to the anaerobic reactor; the anaerobic reactor including an anaerobic reaction vessel, an inlet valve, a first stirrer and a second overflow pipe, the second overflow pipe arranged on the anaerobic reaction vessel, and stirring blades of the first stirrer located inside the anaerobic reaction vessel; the low oxygen nitrogen removal reactor including a low oxygen nitrogen removal reaction vessel, a second stirrer, an aeration device, an air compressor, a gas flowmeter, a controller, a third overflow pipe, an outlet valve, a membrane module and a sludge return pump; the air compressor, the gas flowmeter and the aeration device successively connected through pipelines, the aeration device located inside the low oxygen nitrogen removal reaction vessel, the controller connected with both a dissolved oxygen sensor and the air compressor; the controller configured to control the air compressor through a dissolved oxygen value of the dissolved oxygen sensor, when a concentration of the dissolved oxygen is greater than 0.07mg/L, the air compressor stopped to work, when the concentration of the dissolved oxygen is lower than 0.02mg/L, the air compressor starting to work; stirring blades of the second stirrer located inside the low oxygen nitrogen removal reaction vessel; the membrane module installed on an inner wall of the low oxygen nitrogen removal reaction vessel; and the municipal wastewater tank connected with an inlet pipe of the anaerobic reactor; the outlet pipe of the anaerobic reactor connected with the low oxygen nitrogen removal reaction vessel; the sludge reflux pump connected with all of the low oxygen nitrogen removal reaction vessel, the municipal wastewater tank and the anaerobic reactor through pipelines; the method performs the following steps through the above device:
[00081 starting up a system: inoculating ordinary activated sludge of a
municipal wastewater plant and then adding to the anaerobic reaction vessel
located in the anaerobic reactor to make a concentration of the sludge be
2000-4000mg/L; mixing anammox sludge with enriched and cultivated complete
nitrification sludge and then adding to the low oxygen nitrogen removal vessel to
make the sludge concentration reach 1500-3000mg/L; and adjusting a sludge
concentration of anaerobic ammonium oxidizing bacteria and complete nitrifying
bacteria within the above sludge concentration range, so that a ratio of an aerobic
ammonium oxidation rate to an anaerobic ammonium oxidation rate in the low
oxygen nitrogen removal reactor is 1. 1-1.5.
is [00091 An operation is adjusted as follows:
[00101 (1) a sludge age of the anaerobic reactor is controlled at 3-10d, a
sludge age of the low oxygen nitrogen removal reactor controlled at 10-30d, a
hydraulic retention time is 30-60min, and a reflux ratio of the sludge is 30-100%.
[00111 (2) wastewater including ammonium and organic carbon source is
added to the municipal wastewater tank;
[0012] (3) the wastewater passes through the municipal wastewater tank, the
anaerobic reactor and the low oxygen nitrogen removal reactor in turn;
[0013] (4) turning on a power supply of the dissolved oxygen controller to
start the air compressor, filling the low oxygen nitrogen removal reactor with
oxygen, and monitoring and controlling concentration changes of the dissolved
oxygen in the reactor, to maintain the concentration of the dissolved oxygen
between 0.02-0.07mg/L;
[0014] (5) turning on the sludge return pump of the low oxygen nitrogen
removal reactor, returning the activated sludge in the low oxygen nitrogen
removal reactor to the anaerobic reactor, and supplementing an amount of bacteria
in the anaerobic reactor to ensure that the endogenous can be completely stored in
the anaerobic reactor; when a concentration of effluent nitrate nitrogen increases,
the reflux ratio of the sludge is increased, and an initial reflux ratio of the sludge
is set to 30%.
is [0015] A nitrogen removal principle of the present disclosure is that: firstly,
municipal wastewater is pumped into the anaerobic reactor, and organic matter in
the wastewater is converted into endogenous to be stored in activated sludge, and
then, water is discharged from the anaerobic reactor in the form of activated
sludge and water mixture and enters the low oxygen nitrogen removal reactor
with symbiosis of anammox bacteria and complete nitrifying bacteria; a concentration of dissolved oxygen is controlled by a controller to implement coexistence of anammox bacteria and complete nitrifying bacteria under low oxygen conditions, the endogenous is configured to achieve complete nitrification coupled with endogenous partial-denitrification/anammox, so as to save energy, achieve advanced nitrogen removal.
[0016] The present disclosure provides the advantages as below:
[0017] Compared with the conventional traditional biological nitrogen
removal process, the following advantages of the present disclosure are shown:
[0018] 1) The demand of carbon source is reduced by the endogenous
partial-denitrification/anammox, so that organic carbon sources can be saved
during the nitrogen removal process of the present disclosure;
[0019] 2) The anammox reaction makes part of ammonium do not need
aerobic oxidation, so that the oxygen demand can be reduced, so as to reduce
aeration capacity of the present disclosure;
is [0020] 3) The complete nitrification and the endogenous
partial-denitrification/anammox can be occurred simultaneously, so that 100%
nitrogen removal efficiency can be achieved in theory, and advanced nitrogen
removal can be possible;
[0021] 4) N 2 0 emission in the anammox process is small, so that greenhouse
gas emission in the wastewater treatment process of the present disclosure can be reduced, which is conducive to achieving a goal of carbon peak and carbon neutralization.
[0022] FIG. 1 is a schematic view of a device for advanced nitrogen removal
based on complete nitrification coupled with endogenous
partial-denitrification/anammox under low oxygen condition in accordance with an
embodiment of the present disclosure.
[0023] FIG. 2 is a schematic view of a method for advanced nitrogen
removal based on complete nitrification coupled with endogenous
partial-denitrification/anammox under low oxygen condition in accordance with an
embodiment of the present disclosure.
[0024] The element labels according to the embodiments of the present
disclosure shown as below:
1 municipal wastewater tank, 2 anaerobic reactor, 3 low oxygen
nitrogen removal reactor, 10 box, 11 first overflow pipe, 12 vent pipe, 13 intake
pump, 20 anaerobic reaction vessel, 21 inlet valve, 22 first stirrer, 23 second
overflow pipe, 30 low oxygen nitrogen removal reaction vessel, 31 second stirrer,
32 aeration device, 33 gas flowmeter, 34 air compressor, 35 controller, 36 third
overflow pipe, 37 outlet valve, 38 membrane module, 310 sludge return pump, 311
dissolved oxygen sensor.
[0025] In order to more clearly understand the technical solution hereinafter
in embodiments of the present disclosure, reference will now be made in detail to
embodiments to further explain the present disclosure.
[0026] Unless otherwise specified, experimental methods used in the
embodiment of the present disclosure are conventional methods.
[0027] The materials and reagents used in the embodiment of the present
disclosure can be obtained from commercial sources, unless otherwise specified.
[0028] Referring to FIG. 1, a device for advanced nitrogen removal based on
complete nitrification coupled with endogenous partial-denitrification/anammox
under low oxygen condition in accordance with an embodiment of the present
disclosure includes an municipal wastewater tank 1, an anaerobic reactor 20 and a
low oxygen nitrogen removal reactor 3. The municipal wastewater tank 1
is includes a box 10, a first overflow pipe 11, a vent pipe 12 and an intake pump 13,
the first overflow pipe 11 arranged on an upper end of the box 1, the vent pipe 12
arranged on a lower portion of the box 1, and the inlet pump 13 arranged below the
box 1. The anaerobic reactor 2 includes an anaerobic reaction vessel 20, an inlet
valve 21, a first stirrer 22 and a second overflow pipe 23, the second overflow pipe
23 arranged on a top end of the anaerobic reaction vessel 20, and stirring blades of the first stiffer 22 located inside the anaerobic reaction vessel 20. The low oxygen nitrogen removal reactor 3 includes a low oxygen nitrogen removal reaction vessel 30, a second stiffer 31, an aeration device 32, a gas flowmeter 33, an air compressor 34, a controller 35, a third overflow pipe 36, an outlet valve 37, a membrane module 38, a sludge return pump 310 and a sludge return pump 311.
The air compressor 34, the gas flowmeter 33 and the aeration device 32
successively connected through pipelines, the aeration device 32 located inside the
low oxygen nitrogen removal reaction vessel 30, the controller 35 is a dissolved
oxygen controller and connected with both the dissolved oxygen sensor 311 and
the air compressor 34. The controller 35 is configured to control the air
compressor 34 through a dissolved oxygen value of the dissolved oxygen sensor
311, when a concentration of the dissolved oxygen is greater than 0.07mg/L, the
air compressor 34 stops to work, when the concentration of the dissolved oxygen is
lower than 0.02mg/L, the air compressor 34 starts to work. Stirring blades of the
is second stiffer 31 are located inside the low oxygen nitrogen removal reaction
vessel 30; the membrane module 38 is composed of a polyethylene hollow fiber
membrane and installed on an inner wall of the low oxygen nitrogen removal
reaction vessel 30. The membrane module 38 is connected with a peristaltic
pump to keep a constant water level in a membrane bioreactor. The box 10 of the
municipal wastewater tank 1 is connected with an inlet pipe of the anaerobic reactor 20 via the intake pump 13; the outlet pipe of the anaerobic reactor 20 is connected with the low oxygen nitrogen removal reaction vessel 30; the sludge reflux pump 310 connected with all of the low oxygen nitrogen removal reaction vessel 30, the intake pump 13 of the municipal wastewater tank 1 and the anaerobic reactor 20 through pipelines. The municipal wastewater tank 1 is connected with inlet pipes of the anaerobic reactor 20, and the outlet pipe of the anaerobic reactor 20 is connected with the low oxygen nitrogen removal reaction vessel 30; the sludge reflux pump 310 is connected with all the low oxygen nitrogen removal reaction vessel 30, the municipal wastewater tank 1 and the anaerobic reactor 20 through pipelines.
[0029] The test simulates municipal wastewater as raw water, and specific
water quality is as follows: a concentration of the chemical oxygen demand (COD)
is 130-280mg/L, a concentration of NH4-N is 60-89mg/L, NO-N<0.5mg/L, NO
-N <0.5mg/L. The test system is shown in FIG. 1, both the anaerobic reaction
is vessel 20 and the low oxygen nitrogen removal reaction vessel 30 are made of
plexiglass, an effective volume of the anaerobic reaction vessel 20 is 10L, an
effective volume of the low oxygen nitrogen removal reaction vessel 30 is 10L,
and an effective volume of the municipal wastewater tank is 20L.
[00301 A specific operation is as follows:
[0031] starting up a system: inoculating ordinary activated sludge of a municipal wastewater plant and then adding to the anaerobic reaction vessel 20 located in the anaerobic reactor to make a concentration of the sludge be
2000-4000mg/L; mixing anammox sludge with enriched and cultivated complete
nitrification sludge and then adding to the low oxygen nitrogen removal vessel 30
to make the sludge concentration reach 1500-3000mg/L; and adjusting a sludge
concentration of the anammox bacteria and the complete nitrifying bacteria within
the above sludge concentration range, so that a ratio of an aerobic ammonium
oxidation rate to an anaerobic ammonium oxidation rate in the low oxygen
nitrogen removal reactor is 1.1-1.5.
[0032] An operation is adjusted as follows:
[0033] 2.1) a sludge age of the anaerobic reactor 2 is controlled at 3-10d, a
sludge age of the low oxygen nitrogen removal reactor 3 controlled at 10-30d, a
hydraulic retention time is 0.5-5d, and a reflux ratio of the sludge is 30-100%.
[0034] 2.2) wastewater including ammonium and organic carbon source is
is added to the municipal wastewater tank 1;
[0035] 2.3) the wastewater passes through the municipal wastewater tank 1,
the anaerobic reactor 20 and the low oxygen nitrogen removal reactor 3 in turn;
[0036] 2.4) turning on a power supply of the dissolved oxygen controller 35
to start the air compressor 34, filling the low oxygen nitrogen removal reactor 3
with oxygen, and monitoring and controlling concentration changes of the dissolved oxygen in the low oxygen nitrogen removal reactor 3, to maintain the concentration of the dissolved oxygen between 0.02-0.07mg/L;
[00371 2.5) turning on the sludge return pump 310 of the low oxygen
nitrogen removal reactor 3, returning the activated sludge in the low oxygen
nitrogen removal reactor 3 to the anaerobic reactor 2, and supplementing an
amount of bacteria in the anaerobic reactor 2 to ensure that the endogenous can be
completely stored in the anaerobic reactor 2; when a concentration of effluent
nitrate nitrogen increases, the reflux ratio of the sludge is increased, and an initial
reflux ratio of the sludge is set to 30%.
[00381 Preferably, an aperture diameter of the membrane fiber is 0.1 pm, so
that microbial cells can be unable to pass therethrough to be stayed in the reactor.
Growth rates of the anaerobic ammonium oxidizing bacteria and the complete
nitrifying bacteria are slow, so as to avoid low advanced nitrogen removal effects
that is caused by biomass loss.
is [00391 The experimental results show that after performing stable operation,
the concentration of the chemical oxygen demand that water is discharged by the
anaerobic reactor is 30-60mg/L, the concentration of H4 -N is 55-80mg/L, the
concentration of No;2-N is 0.1-3.5mg/L, and the concentration of NO -N is
0.1-1.Omg/L; while, the concentration of the chemical oxygen demand that water is
discharged by the low oxygen nitrogen removal reactor is 20-30mg/L, the concentration of NH4-N is 0-10mg/L, the concentration of NO-N is 0-3.mg/L, and the concentration of NO-N is 0-4.mg/L. Compared with the conventional biological nitrogen removal process, in the present disclosure, 60-95% of oxygen consumption can be saved and 50% - 200% of total nitrogen in effluent can be reduced.
[00401 To sum up, municipal wastewater is firstly pumped into the anaerobic
reactor, and organic matter in the wastewater is converted into endogenous to be
stored in activated sludge, and then, water is discharged from the anaerobic reactor
in the form of activated sludge and water mixture and enters the low oxygen
nitrogen removal reactor with symbiosis of anaerobic ammonium oxidizing
bacteria and complete nitrifying bacteria, so as to achieve complete nitrification
coupled with endogenous partial-denitrification/anammox; the concentration of the
dissolved oxygen is controlled by the controller to implement the coexistence of
the anaerobic ammonium oxidizing bacteria and the complete nitrifying bacteria
is under low oxygen conditions, the endogenous is configured to achieve complete
nitrification coupled with endogenous partial-denitrification/anammox, so as to
save energy, reduce consumption and advanced nitrogen removal.
[00411 Although the features and elements of the present disclosure are
described as embodiments in particular combinations, each feature or element can
be used alone or in other various combinations within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (9)
- CLAIMS What is claimed is: 1. A device for deep denitrification based on complete nitrification coupled with an internal carbon source short-range denitrification anaerobic ammonia oxidation under a low oxygen condition comprising an urban sewage raw water tank, an anaerobic reactor and a low oxygen denitrification reactor; and wherein an organic carbon source is stored in an anaerobic stage; the low oxygen denitrification reactor comprising a low oxygen denitrification reaction vessel, a second stirrer, an aeration device, an air compressor, a gas flowmeter, a controller, a third overflow pipe, an outlet valve, a membrane module and a sludge return pump; the air compressor, the gas flowmeter and the aeration device successively connected through pipelines, the aeration device located inside the low oxygen denitrification reaction vessel, the controller connected with both a dissolved oxygen sensor and the air compressor; the controller configured to control the air compressor through a dissolved oxygen value of the dissolved oxygen sensor, when a concentration of the dissolved oxygen is greater than 0.07mg/, the air compressor stopped to work, when the concentration of the dissolved oxygen is lower than 0.02mg/, the air compressor starting to work; stirring blades of the second stirrer located inside the low oxygen denitrification reaction vessel; the membrane module installed on an inner wall of the low oxygen denitrification reaction vessel; and the urban sewage raw water tank connected with an inlet pipe of the anaerobic reactor; the outlet pipe of the anaerobic reactor connected with the low oxygen denitrification reaction vessel; the sludge reflux pump connected with all of the low oxygen denitrification reaction vessel, the urban sewage raw water tank and the anaerobic reactor through pipelines.
- 2. The device as claimed in claim 1, wherein the urban sewage raw water tank comprises a box, a first overflow pipe, a vent pipe and an intake pump, both the first overflow pipe and the vent pipe arranged on the box, and the inlet pump configured to transport the sewage in the urban sewage raw water tank to the anaerobic reactor.
- 3. The device as claimed in claim 2, wherein the anaerobic reactor comprises an anaerobic reaction vessel, an inlet valve, a first stirrer and a second overflow pipe, the second overflow pipe arranged on the anaerobic reaction vessel, and stirring blades of the first stirrer located inside the anaerobic reaction vessel.
- 4. The device as claimed in claim 3, wherein the membrane module is composed of a polyethylene hollow fiber membrane, with an aperture diameter of the membrane fiber of 0.1 m, and the membrane module is connected with a peristaltic pump.
- 5. A method for deep denitrification based on complete nitrification coupled with an internal carbon source short-range denitrification anaerobic ammonia oxidation under a low oxygen condition, is applied to a device for deep denitrification based on complete nitrification coupled with the internal carbon source short-range denitrification anaerobic ammonia oxidation under the low oxygen condition, the device comprising an urban sewage raw water tank, an anaerobic reactor and a low oxygen denitrification reactor; and wherein an organic carbon source is stored in an anaerobic stage; the low oxygen denitrification reactor comprising a low oxygen denitrification reaction vessel, a second stirrer, an aeration device, an air compressor, a gas flowmeter, a controller, a third overflow pipe, an outlet valve, a membrane module and a sludge return pump; the air compressor, the gas flowmeter and the aeration device successively connected through pipelines, the aeration device located inside the low oxygen denitrification reaction vessel, the controller connected with both a dissolved oxygen sensor and the air compressor; the controller configured to control the air compressor through a dissolved oxygen value of the dissolved oxygen sensor, when a concentration of the dissolved oxygen is greater than 0.07mg/L, the air compressor stopped to work, when the concentration of the dissolved oxygen is lower than 0.02mg/L, the air compressor starting to work; stirring blades of the second stirrer located inside the low oxygen denitrification reaction vessel; the membrane module installed on an inner wall of the low oxygen denitrification reaction vessel; and the urban sewage raw water tank connected with an inlet pipe of the anaerobic reactor; the outlet pipe of the anaerobic reactor connected with the low oxygen denitrification reaction vessel; the sludge reflux pump connected with all of the low oxygen denitrification reaction vessel, the urban sewage raw water tank and the anaerobic reactor through pipelines; and wherein the method performs the following steps through the device: starting up a system: inoculating ordinary activated sludge of a urban sewage plant and then adding to the anaerobic reaction vessel located in the anaerobic reactor to make a concentration of the sludge be 2000-4000mg/L; mixing anammox sludge with enriched and cultivated complete nitrification sludge and then adding to the low-oxygen denitrification reaction vessel to make the sludge concentration reach 1500-3000mg/L; and adjusting a sludge concentration of anaerobic ammonia oxidizing bacteria and complete nitrifying bacteria within the above sludge concentration range, so that a ratio of an aerobic ammonia oxidation rate to an anaerobic ammonia oxidation rate in the low oxygen denitrification reactor is 1.1-1.5.
- 6. The method as claimed in claim 5, wherein a sludge age of the anaerobic reactor is controlled at 3-10d, a sludge age of the low oxygen denitrification reactor controlled at 10-30d, a hydraulic retention time is 30-60min, and a reflux ratio of the sludge is 30-100%.
- 7. The method as claimed in claim 6, wherein wastewater comprising ammonia nitrogen and chemical oxygen demands is added to the urban sewage raw water tank, and the wastewater passes through the urban sewage raw water tank, the anaerobic reactor and the low oxygen denitrification reactor in turn.
- 8. The method as claimed in claim 7, wherein the method further comprises: turning on a power supply of the dissolved oxygen controller to start the air compressor, filling the low-oxygen denitrification reactor with oxygen, and monitoring and controlling concentration changes of the dissolved oxygen in the reactor, to maintain the concentration of the dissolved oxygen between 0.02-0.07mg/L.
- 9. The method as claimed in claim 8, wherein the method further comprises: turning on the sludge return pump of the low oxygen denitrification reactor, returning the sludge water mixture in the low oxygen denitrification reactor to the anaerobic reactor, and supplementing an amount of bacteria in the anaerobic reactor to ensure that the internal carbon source can be completely stored in the anaerobic reactor; when a concentration of effluent nitrate nitrogen increases, the reflux ratio of the sludge is increased, and an initial reflux ratio of the sludge is set to 30%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111338840.5A CN114105296B (en) | 2021-11-12 | 2021-11-12 | Device and method for deep denitrification based on low-oxygen complete nitrification and coupling of internal carbon source short-range denitrification anaerobic ammonia oxidation |
| CN202111338840.5 | 2021-11-12 | ||
| PCT/CN2021/131997 WO2023082316A1 (en) | 2021-11-12 | 2021-11-22 | Anaerobic ammonia oxidation deep denitrification method and apparatus based on low-oxygen total nitrification coupled with internal carbon source shortcut denitrification |
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| CN112250188A (en) * | 2020-10-20 | 2021-01-22 | 江苏南大华兴环保科技股份公司 | Denitrification treatment method and denitrification treatment system for thiourea-containing ammonia nitrogen wastewater |
| CN113371820A (en) * | 2021-07-06 | 2021-09-10 | 浙江工业大学 | Nitrogen and phosphorus removal device and method by coupling iron-carbon microelectrolysis with endogenous denitrification/anaerobic ammonia oxidation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111661923A (en) * | 2020-06-22 | 2020-09-15 | 浙江工业大学 | Two-stage type deep denitrification device and method with short-cut nitrification and anaerobic ammonia oxidation coupled with endogenous denitrification |
| CN112250188A (en) * | 2020-10-20 | 2021-01-22 | 江苏南大华兴环保科技股份公司 | Denitrification treatment method and denitrification treatment system for thiourea-containing ammonia nitrogen wastewater |
| CN113371820A (en) * | 2021-07-06 | 2021-09-10 | 浙江工业大学 | Nitrogen and phosphorus removal device and method by coupling iron-carbon microelectrolysis with endogenous denitrification/anaerobic ammonia oxidation |
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