CN111153495A - Sequencing batch reaction process and device for single-step denitrification without moving part - Google Patents
Sequencing batch reaction process and device for single-step denitrification without moving part Download PDFInfo
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- 238000012163 sequencing technique Methods 0.000 title claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 119
- 238000005273 aeration Methods 0.000 claims abstract description 56
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000010802 sludge Substances 0.000 claims abstract description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 241001052560 Thallis Species 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000010923 batch production Methods 0.000 claims 1
- 238000010907 mechanical stirring Methods 0.000 abstract description 12
- 239000010865 sewage Substances 0.000 abstract description 9
- 239000002351 wastewater Substances 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 238000005276 aerator Methods 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- 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
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1263—Sequencing batch reactors [SBR]
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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
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- C02F2101/30—Organic compounds
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/22—O2
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Abstract
The invention discloses a sequencing batch reaction process and a sequencing batch reaction device for single-step denitrification without moving parts, which comprise a reactor main body, a water inlet device, a water outlet device, a blast device, a sludge discharge device and a control device, wherein the reactor main body is provided with a water inlet pipe and a water outlet pipe; the bottom of the reactor main body is provided with an aeration device, the upper part of the reactor main body is provided with a fixed water collecting device, and a dissolved oxygen or ORP sensor and an ammonia nitrogen sensor are arranged below the liquid level in the reactor main body; the water inlet device is positioned at the lower part of the reactor main body, and the water outlet device is positioned at one side of the middle part of the reactor main body and is connected with the water collecting device; the blower unit is connected to the aerator on the top of the reactor body. The equipment is highly simplified, a mechanical stirring device and a decanter of the traditional SBR are not provided, any moving part is not arranged in the tank, the maintenance is easy, and the failure rate is low; has good regulating capacity, can effectively remove organic matters, particularly ammonia nitrogen and total nitrogen, and can be used for centralized and dispersed treatment of polluted water such as domestic sewage, non-point source pollution, organic wastewater and the like.
Description
Technical Field
The invention belongs to the technical field of resources and environment, and particularly relates to a sequencing batch reaction process and a sequencing batch reaction device for single-step denitrification without mechanical stirring, a decanter and moving parts in a pool, which are suitable for treating domestic sewage, various organic wastewater, mixed flow sewage and black and odorous water in cities and towns.
Background
The traditional sewage treatment process comprises 3 types of activated sludge method, membrane method, natural treatment and the like. The former two have high treatment load and small occupied area, but have large equipment quantity, complex maintenance, low adaptability to impact load and high energy consumption, and the effluent quality is reduced in a period of time when the peak load is high or after the peak load is low; the latter has low energy consumption, certain load resisting capacity, large occupied area and low processing load.
However, in a large number of places needing to be treated at present, the water quality change range and the water quantity change range are large, the use area is limited, particularly for protecting the water quality, strict limit values for pollutants such as BOD, ammonia nitrogen, total nitrogen and the like are often needed, the strength of field personnel is limited, and the requirements promote the wide application of the sequencing batch reaction process and the device of single-step denitrification without mechanical stirring, a decanter and moving parts in a pool.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a single-step denitrification sequencing batch reactor without moving parts, the equipment is highly simplified, a mechanical stirring device and a decanter of the traditional SBR are not provided, no moving part is arranged in a tank, the maintenance is easy, and the failure rate is low.
Correspondingly, the invention also provides a sequencing batch reaction process of single-step denitrification without moving parts, which has good regulating capacity, can effectively remove organic matters, particularly ammonia nitrogen and total nitrogen, and can be used for centralized and dispersed treatment of polluted water such as domestic sewage, non-point source pollution, organic wastewater and the like.
In order to achieve the purpose, the invention adopts the following technical measures:
the invention relates to a sequencing batch reaction process for single-step denitrification without moving parts, which comprises the following steps:
A. in the initial aeration stage, the blower blows air into the reactor main body through the aeration device to realize the stirring and mixing of water in the reactor main body; after the initial aeration period, the organic matters are adsorbed by the thalli; the dissolved oxygen concentration in the reactor main body at the stage is 0-1.2 mg/L or the detection value of an ORP sensor is-200-100 mV;
B. in the middle period of aeration, along with the aeration, organic matters are degraded and total nitrogen is removed; the dissolved oxygen concentration in the reactor main body at the stage is 1.5-3.5 mg/L, the detection value of an ORP sensor is 200-400 mV, or the ammonia nitrogen of the effluent detected by the ammonia nitrogen sensor is lower than 15% of the target value;
C. in the later period of aeration, residual ammonia nitrogen is effectively removed along with the aeration, and the content of the residual ammonia nitrogen is within 1 mg/L; the dissolved oxygen concentration in the reactor main body at the stage is 2.5-4 mg/L, the detection value of an ORP sensor is 300-450 mV, or the ammonia nitrogen of effluent detected by an ammonia nitrogen sensor is lower than more than 15% of a target value;
D. along with the water treatment process, the sludge is increased, and is periodically discharged through a sludge discharge device, so that the proper sludge concentration in the reactor main body is maintained and the activity is kept.
The invention relates to a single-step denitrification sequencing batch reactor without moving parts, which comprises a reactor main body, a water inlet device, a water outlet device, a blast device, a sludge discharge device and a control device, wherein the reactor main body is provided with a water inlet pipe and a water outlet pipe;
an aeration device is arranged at the bottom of the reactor main body, a fixed water collecting device is arranged at the upper part of the reactor main body, and a dissolved oxygen or ORP sensor and an ammonia nitrogen sensor are arranged below the liquid level in the reactor main body;
the water inlet device is positioned on one side of the lower part of the reactor main body and is connected with the inner cavity of the reactor main body shell;
the water outlet device is positioned on one side of the middle part of the reactor main body and is connected with the water collecting device in the reactor main body;
the blowing device is positioned at the top of the reactor main body and is connected with the aeration device in the reactor main body;
the sludge discharge device is positioned on the other side of the lower part of the reactor main body and is connected with the inner cavity of the reactor main body shell;
the control device is respectively connected with the water inlet device, the water outlet device, the blowing device, the dissolved oxygen or ORP sensor and the ammonia nitrogen sensor.
Furthermore, the water inlet device comprises a water inlet pipe connected with the inner cavity of the reactor main body shell, and a water inlet valve is arranged on the water inlet pipe.
The water outlet device comprises a water outlet pipe connected with the water collecting device in the reactor main body, and a water outlet valve is arranged on the water outlet pipe.
The air blowing device comprises an air pipeline connected with the aeration device in the reactor main body, and the other end of the air pipeline is connected with the air blower.
The sludge discharge device comprises a sludge discharge pipeline connected with the inner cavity of the reactor main body shell, and a sludge discharge valve is arranged on the sludge discharge pipeline.
The control device comprises a PLC (programmable logic controller), the PLC is connected with the air blower through a first control line, the PLC is connected with the water inlet valve through a second control line, the PLC is connected with the water outlet valve through a third control line, the PLC is connected with the ammonia nitrogen sensor through a fourth control line, and the PLC is connected with the dissolved oxygen or ORP sensor through a fifth control line.
The key technical scheme of the technical measures adopted by the invention is as follows:
(1) the PLC is used for controlling the blower to realize limited aeration or intermittent aeration so as to replace a mechanical stirring device;
(2) a fixed water collecting device and a water outlet device controlled by a PLC are combined to replace a decanter;
(3) each period comprises 3-stage modes of water inlet/outlet, aeration and precipitation, or 5-stage modes of water inlet, aeration, precipitation, water outlet, idling and the like, and the steps are repeated in this way to realize the purification of water, and the control parameters are as follows: the single water inflow or water outflow does not exceed 46 percent of the total tank volume, the overflow rate does not exceed 1.7m/h, the settling time is 15-60 min, and the idle time is generally 0-360 min (the water inflow is high, the water inflow is low, and the water inflow is low, the water outflow is long);
(4) the aeration stage is divided into 3 sub-stages, namely an early stage (a mixing stage), a middle stage (a carbonization and synchronous nitrification/denitrification stage), a later stage (a complete nitrification stage) and the like, and different aeration parameters are respectively adopted.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the equipment of the invention is highly simplified, and has no equipment such as a mechanical stirring device, a decanter and the like of the traditional SBR, and no moving part is arranged in the whole pool, so the invention has the advantages of easy maintenance, high operation reliability and low failure rate; through three-stage aeration control, COD/TN removal and ammonia nitrogen removal can be effectively realized in stages, the operation control is flexible, the adaptability to impact load of water quality and water quantity is strong, and the treatment effect is stable; compared with the traditional sequencing batch reactor, the denitrification efficiency is improved by more than 10-20% under the condition of low C/N ratio; the energy consumption for unit water treatment is reduced by more than 10%.
The invention has small installed power and lower requirement on the external line of the power supply; meanwhile, the composite material has good regulating capacity, can effectively remove organic matters, particularly ammonia nitrogen and total nitrogen, and can be used for centralized and dispersed treatment of polluted water such as domestic sewage, non-point source pollution, organic wastewater and the like.
The invention has high treatment efficiency aiming at pollutants such as COD, BOD, ammonia nitrogen, TN and the like, is particularly suitable for places with strict limit values on BOD, ammonia nitrogen and total nitrogen, and has the characteristics of water quality and water quantity impact load resistance, low energy consumption, easy management and less occupied area.
Drawings
FIG. 1 is a schematic view of a single-step denitrification sequencing batch reactor without moving parts according to the present invention.
Wherein: 1-a reactor main body, 2-a water inlet device, 3-a water outlet device, 4-a blower device, 5-a sludge discharge device, 6-a control device, 7-a reactor main body shell, 8-an aeration device, 9-a fixed water collecting device, 10-a dissolved oxygen or ORP sensor, 11-a water inlet valve, 12-a water inlet pipe, 13-a water outlet valve, 14-a water outlet pipe, 15-an air blower, 16-an air pipeline, 17-a sludge discharge valve, 18-a sludge discharge pipeline, 19-a PLC, 20-an ammonia nitrogen sensor, 21-a first control line, 22-a second control line, 23-a third control line, 24-a fourth control line and 25-a fifth control line.
Detailed Description
Example 1:
referring to fig. 1, the present invention adopts a single step denitrification sequencing batch reaction process and apparatus without mechanical agitation, decanter and moving parts in the tank, and the technical scheme is as follows:
(1) the PLC is used for controlling the blower 15 to realize the limited aeration or the intermittent aeration so as to replace a mechanical stirring device;
(2) the fixed water collecting device 9 and the water outlet device controlled by the PLC are combined to replace a decanter;
(3) each period comprises 3-stage modes of water inlet/outlet, aeration and precipitation, or 5-stage modes of water inlet, aeration, precipitation, water outlet, idling and the like, and the steps are repeated in this way to realize the purification of water;
(4) the aeration stage is divided into 3 sub-stages, namely an early stage (a mixing stage), a middle stage (a carbonization and synchronous nitrification/denitrification stage), a later stage (a complete nitrification stage) and the like, and different aeration parameters are respectively adopted.
Preferably, the aeration phase early and middle of each cycle is assisted by dissolved oxygen or feedback from ORP sensor 10 to control aeration. The feedback of the dissolved oxygen or ORP sensor 10 and the ammonia nitrogen sensor 20 is combined to assist in controlling the blast at the later stage of the aeration period of each period.
The invention relates to a sequencing batch reaction process for single-step denitrification without mechanical stirring, decanter and moving parts in a pool, which comprises the following steps:
① each period comprises 3-stage modes of water inlet/outlet, aeration and precipitation, or 5-stage modes of water inlet, aeration, precipitation, water outlet, idling and the like, and the purification of water is realized by repeating the steps;
② in the initial aeration stage, the blower 15 blows air into the reactor through the aeration device 8 to realize stirring and mixing of water, and at the end of the initial aeration stage, more than 60% of organic matters are adsorbed by the thalli, and in the stage, the aeration limiting parameters are preset according to the dissolved oxygen concentration in the reactor body 1 or controlled according to the upper limit value and the lower limit value detected by the ORP sensor 10, wherein the dissolved oxygen concentration in the reactor body 1 in the initial aeration stage is 0-1.2 mg/L or the detection value of the ORP sensor 10 is-200-100 mV;
③ in the middle period of aeration, organic matters are effectively degraded and total nitrogen is effectively removed along with the aeration, the limited aeration parameter is preset according to the dissolved oxygen concentration in the reactor main body 1 or is controlled according to the upper limit value and the lower limit value detected by an ORP (oxygen reduction potential) or ammonia nitrogen sensor, the dissolved oxygen concentration in the reactor main body 1 in the middle period of aeration is 1.5-3.5 mg/L or the detection value of the ORP sensor 10 is 200-400 mV or the ammonia nitrogen in the effluent detected by the ammonia nitrogen sensor 20 is lower than 15% of the target value;
④ in the later period of aeration, residual ammonia nitrogen is effectively removed along with the aeration and can reach within 1mg/L, the limited aeration parameter is preset according to the dissolved oxygen concentration in the reactor main body 1 or is controlled according to the ORP or the upper limit value and the lower limit value detected by an ammonia nitrogen sensor, the dissolved oxygen concentration in the reactor main body 1 in the later period of aeration is 2.5-4 mg/L or the detection value of the ORP sensor 10 is 300-450 mV or the ammonia nitrogen in the effluent detected by the ammonia nitrogen sensor 20 is less than 15% of the target value;
⑤ sludge will increase with the water treatment process and be periodically removed by sludge removal device 5 to maintain proper sludge concentration and activity in the reactor.
The dissolved oxygen concentration in the reactor main body 1 can be detected by a dissolved oxygen sensor.
The invention relates to a sequencing batch reactor for single-step denitrification without mechanical stirring, decanter and moving parts in a pool, which comprises: the reactor comprises a reactor main body 1, a water inlet device 2, a water outlet device 3, a blower device 4, a sludge discharge device 5 and a control device 6.
An aeration device 8 is arranged at the bottom in a shell 7 of the reactor main body, a fixed water collecting device 9 is arranged at the upper part of the reactor main body 1, and a dissolved oxygen or ORP sensor 10 and an ammonia nitrogen sensor 20 are arranged below the liquid level.
The water inlet device 2 is positioned at one side of the lower part of the reactor main body 1 and is connected with the inner cavity of the reactor main body shell 7, the water inlet device 2 comprises a water inlet pipe 12, one end of the water inlet pipe 12 is connected with a water inlet valve 11, and the other end of the water inlet pipe 12 is connected with the inner cavity of the reactor main body shell 7 of the reactor main body 1.
The water outlet device 3 is positioned on one side of the middle part of the reactor main body 1 and is connected with the water collecting device 9 in the reactor main body 1, the water outlet device 3 comprises a water outlet pipe 14, one end of the water outlet pipe 14 is connected with the water collecting device 9 in the reactor main body 1, and the other end of the water outlet pipe 14 is connected with a water outlet valve 13.
The air blowing device 4 of the present invention is located at the top of the reactor main body 1 and is connected with the aeration device 8 in the reactor main body 1, the air blowing device 4 comprises an air pipe 16, one end of the air pipe 16 is connected with an air blower 15, and the other end of the air pipe 16 is connected with the aeration device 8 in the reactor main body 1.
The sludge discharge device 5 is positioned on the other side of the lower part of the reactor main body 1 and is connected with the inner cavity of the reactor main body shell 7, the sludge discharge device 5 comprises a sludge discharge pipeline 18, one end of the sludge discharge pipeline 18 is connected with the lower part of the inner cavity of the reactor main body shell 7 of the reactor main body 1, and the other end of the sludge discharge pipeline 18 is connected with a sludge discharge valve 17.
The control device 6 comprises a PLC (programmable logic controller) 19, one end of a first control line 21 is connected with the PLC 19, the other end of the first control line is connected with an air blower 15, one end of a second control line 22 is connected with the PLC 19, and the other end of the second control line is connected with a water inlet valve 11 of a water inlet device 2; one end of the third control line 23 is connected with the PLC 19, and the other end is connected with the water outlet valve 13 of the water outlet device 3; one end of a fourth control line 24 is connected with the PLC 19, and the other end is connected with the ammonia nitrogen sensor 20 in the reactor main body 1; one end of the fifth control line 25 is connected to the PLC controller 19, and the other end is connected to the dissolved oxygen or ORP sensor 10 in the reactor main body 1.
The typical treatment effect of the single-step denitrification sequencing batch reaction process and device without mechanical stirring, decanter and moving parts in the tank on the domestic sewage or confluent sewage is shown as the following table:
| item | COD | TN | Ammonia nitrogen | TP | SS |
| Inflow (mg/L) | 300 | 50 | 40 | 3.0 | 150 |
| Water outlet (mg/L) | 50 | 13 | 1 | 0.5 | 14 |
| Removal rate | 83％ | 74％ | 97％ | 83％ | 91％ |
Example 2:
example 2 the structure, connection and process are the same as example 1, and the single-step denitrification sequencing batch reaction process and device without mechanical stirring, decanter and moving parts in the tank of example 2 is used for certain organic wastewater, and the typical treatment effect is shown in the following table:
| item | COD | BOD | TP | Ammonia nitrogen | SS |
| Inflow (mg/L) | 600 | 300 | 4.0 | 60 | 300 |
| Water outlet (mg/L) | 40 | 10 | 0.5 | 0.9 | 30 |
| Removal rate | 93％ | 97％ | 87％ | 98％ | 90％ |
Example 3:
example 3 the structure, connection relationship and process are the same as those of example 1 except that a dissolved oxygen or ORP sensor 10 is provided below the liquid level in the reactor main body 1. The single-step denitrification sequencing batch reaction process and device without mechanical stirring, decanter and moving parts in the tank of example 3 was used for sewage in certain villages and towns, and the typical treatment effect is shown in the following table:
| item | COD | BOD | TP | Ammonia nitrogen | SS |
| Inflow (mg/L) | 100 | 50 | 4.0 | 30 | 180 |
| Water outlet (mg/L) | 35 | 15 | 1.0 | 5 | 20 |
| Removal rate | 65％ | 70％ | 75％ | 83％ | 89％ |
Claims (7)
1. A single-step denitrification sequencing batch reaction process without moving parts, which is characterized in that: the method comprises the following steps:
A. in the initial aeration stage, the blower (15) blows air into the reactor main body (1) through the aeration device (8) to realize stirring and mixing of water in the reactor main body (1); after the initial aeration period, the organic matters are adsorbed by the thalli; the concentration of dissolved oxygen in the reactor main body (1) at the stage is 0-1.2 mg/L or the detection value of an ORP sensor is-200-100 mV;
B. in the middle period of aeration, along with the aeration, organic matters are degraded and total nitrogen is removed; the dissolved oxygen concentration in the reactor main body (1) at the stage is 1.5-3.5 mg/L, the detection value of an ORP sensor is 200-400 mV, or the ammonia nitrogen in the effluent detected by an ammonia nitrogen sensor (20) is lower than 15% of the target value;
C. in the later period of aeration, residual ammonia nitrogen is effectively removed along with the aeration, and the content of the residual ammonia nitrogen is within 1 mg/L; the dissolved oxygen concentration in the reactor main body (1) at the stage is 2.5-4 mg/L, the detection value of an ORP sensor is 300-450 mV, or the ammonia nitrogen of effluent detected by an ammonia nitrogen sensor (20) is lower than more than 15% of a target value;
D. along with the water treatment process, the sludge is increased and is periodically discharged through the sludge discharge device (5), so that the proper sludge concentration and activity in the reactor main body (1) are maintained.
2. An apparatus for carrying out the single-step denitrification sequencing batch process without moving parts of claim 1, wherein: comprises a reactor main body (1), a water inlet device (2), a water outlet device (3), a blower device (4), a sludge discharge device (5) and a control device (6);
an aeration device (8) is arranged at the bottom of the reactor main body (1), a fixed water collecting device (9) is arranged at the upper part of the reactor main body (1), and a dissolved oxygen or ORP sensor (10) and an ammonia nitrogen sensor (20) are arranged below the liquid level in the reactor main body (1);
the water inlet device (2) is positioned on one side of the lower part of the reactor main body (1) and is connected with the inner cavity of the reactor main body shell (7);
the water outlet device (3) is positioned on one side of the middle part of the reactor main body (1) and is connected with a water collecting device (9) in the reactor main body (1);
the blower device (4) is positioned at the top of the reactor main body (1) and is connected with an aeration device (8) in the reactor main body (1);
the sludge discharge device (5) is positioned on the other side of the lower part of the reactor main body (1) and is connected with the inner cavity of the reactor main body shell (7);
the control device (6) is respectively connected with the water inlet device (2), the water outlet device (3), the air blowing device (4), the dissolved oxygen or ORP sensor (10) and the ammonia nitrogen sensor (20).
3. The sequencing batch reactor with single step denitrification without moving parts of claim 2 wherein: the water inlet device (2) comprises a water inlet pipe (12) connected with the inner cavity of the reactor main body shell (7), and a water inlet valve (11) is arranged on the water inlet pipe (12).
4. The sequencing batch reactor with single step denitrification without moving parts of claim 3 wherein: the water outlet device (3) comprises a water outlet pipe (14) connected with the water collecting device (9) in the reactor main body (1), and a water outlet valve (13) is arranged on the water outlet pipe (14).
5. The sequencing batch reactor with single step denitrification without moving parts of claim 4 wherein: the air blowing device (4) comprises an air pipeline (16) connected with an aeration device (8) in the reactor main body (1), and the other end of the air pipeline (16) is connected with an air blower (15).
6. The sequencing batch reactor with single step denitrification without moving parts of claim 5 wherein: the sludge discharge device (5) comprises a sludge discharge pipeline (18) connected with the inner cavity of the reactor main body shell (7), and a sludge discharge valve (17) is arranged on the sludge discharge pipeline (18).
7. The sequencing batch reactor with single step denitrification without moving parts of claim 6 wherein: the control device (6) comprises a PLC (programmable logic controller) (19), the PLC (19) is connected with the air blower (15) through a first control line (21), the PLC (19) is connected with the water inlet valve (11) through a second control line (22), the PLC (19) is connected with the water outlet valve (13) through a third control line (23), the PLC (19) is connected with the ammonia nitrogen sensor (20) through a fourth control line (24), and the PLC (19) is connected with the dissolved oxygen or ORP sensor (10) through a fifth control line (25).
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