CN212246418U - Intelligent aeration denitrification system - Google Patents
Intelligent aeration denitrification system Download PDFInfo
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- CN212246418U CN212246418U CN202020769019.3U CN202020769019U CN212246418U CN 212246418 U CN212246418 U CN 212246418U CN 202020769019 U CN202020769019 U CN 202020769019U CN 212246418 U CN212246418 U CN 212246418U
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Abstract
The invention relates to the technical field of sewage treatment, in particular to an intelligent aeration denitrification system which is characterized by comprising an anaerobic zone, an aerobic zone, a flexible zone, a post anoxic zone, a secondary sedimentation tank and a carbon source adding storage tank; aeration equipment, a dissolved oxygen meter and an ammonia nitrogen meter are arranged in the aerobic zone and the flexible zone; a nitric acid nitrogen instrument and an ammonia nitrogen instrument are arranged in the back anoxic zone, the carbon source adding storage tank is communicated with the back anoxic zone, and a carbon source control valve is arranged on a carbon source pipeline; the anaerobic treatment device is characterized by further comprising a water inlet pipeline, wherein a water inlet pump is arranged at one end of the water inlet pipeline, a first branch and a second branch of the water inlet pipeline are respectively communicated with the anaerobic zone and the back anoxic zone, and the instruments and the control valves are cooperatively controlled and adjusted through a DCS (distributed control system). The denitrification system can be intelligently operated, namely, the aeration quantity, the reflux quantity and the carbon source adding quantity are self-adjusted, the consumption of an additional carbon source is reduced as much as possible, the operation cost is reduced, and the stable and energy-saving effects of a biochemical system are finally achieved.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of sewage treatment, and particularly relates to an intelligent aeration denitrification system.
[ background of the invention ]
Along with the increasing of environmental pollution, the national attention on environmental protection is higher and higher, the discharge requirements of national and local governments on sewage plants are gradually strict, and along with the improvement of the discharge requirements, the difficulty of reaching the standard of the effluent quality of the sewage plants is increased, and the operation cost of the sewage plants is also increased.
Wherein A is2the/O process is a mainstream process in the current sewage treatment process, and is provided with an anaerobic reaction tank, an anoxic reaction tank and an aerobic reaction tank, wherein phosphorus is released in the anaerobic state, nitric acid nitrogen is removed by denitrification in the anoxic state, COD and ammonia nitrogen (converted into nitric acid nitrogen) are removed in the aerobic state, and therefore pollutants in sewage are effectively removed. However, it is known that the problems of unstable quality of effluent water, excessive energy consumption, high labor intensity and the like exist in a plurality of sewage plants at present, and the phenomena of unstable quality of effluent water, high operation energy consumption and the like are caused mainly because aeration and reflux control are rough and inaccurate and adjustment is not timely enough.
Therefore, for the current situation, how to make A in sewage treatment plant, especially sewage treatment plant for treating low carbon/nitrogen sewage2The aeration quantity of the/O biochemical tank during operation is more accurate, the water outlet is stable, and the operation energy consumption is reduced, thus becoming a difficult problem which is urgently needed to be solved in the field of sewage treatment at the present stage.
[ summary of the invention ]
The invention provides an intelligent aeration denitrification system, which can automatically and accurately adjust aeration quantity, reflux quantity, carbon source adding quantity and the like, can reduce the consumption of an additional carbon source and the like as much as possible, and reduces the operation cost, thereby realizing the stable and energy-saving automatic operation of a biochemical system.
In order to achieve the purpose, the invention provides the following technical scheme: an intelligent aeration denitrification system comprises an anaerobic zone, an aerobic zone, a flexible zone, a back anoxic zone, a secondary sedimentation tank and a carbon source adding storage tank filled with a carbon source, which are sequentially communicated; aeration equipment, a dissolved oxygen meter and an ammonia nitrogen meter are arranged in the aerobic zone and the flexible zone, and the aeration equipment is connected with a fan through an aeration pipeline; aeration control valves for controlling the aeration amount of each aeration device are correspondingly arranged on the aeration pipelines; a nitric acid nitrogen instrument and an ammonia nitrogen instrument are arranged in the back anoxic zone, the carbon source adding storage tank is introduced into the back anoxic zone through a carbon source pipeline, and a carbon source control valve for adjusting the adding amount of the carbon source is arranged on the carbon source pipeline; the anaerobic zone and the back anoxic zone are communicated with each other, and a first water inlet control valve and a second water inlet control valve for controlling water inflow are arranged on the first branch and the second branch respectively; and the instruments and the control valves are cooperatively controlled and adjusted through a DCS (distributed control system).
Preferably, a front anoxic zone is communicated and arranged between the anaerobic zone and the aerobic zone, the front anoxic zone is communicated with the flexible zone through a return pipeline, and a return pump and a return control valve are arranged on the return pipeline.
Preferably, a dissolved oxygen meter and a nitric acid nitrogen meter are arranged in the front anoxic zone.
Preferably, the aerobic zone comprises an aerobic first zone and an aerobic second zone, and aeration equipment, a dissolved oxygen meter and an ammonia nitrogen meter are arranged in the aerobic first zone and the aerobic second zone.
Preferably, flow impellers are arranged in the anaerobic zone, the front anoxic zone and the rear anoxic zone.
Preferably, through the water inlet pipeline, the water inlet proportion of the anaerobic zone and the post-anoxic zone is (80-90): (10-20).
Preferably, an ORP meter for judging the oxidation reduction capability of the sewage is arranged in the anaerobic zone.
Preferably, the secondary sedimentation tank is respectively communicated with the rear anoxic zone and the anaerobic zone.
Preferably, a plurality of baffle plates are arranged in the aerobic zone.
Preferably, the dissolved oxygen meter and the nitric acid nitrogen meter in the front anoxic zone, the dissolved oxygen meter and the ammonia nitrogen meter in the aerobic zone, the dissolved oxygen meter and the ammonia nitrogen meter in the flexible zone, and the nitric acid nitrogen meter and the ammonia nitrogen meter in the rear anoxic zone are respectively arranged at the tail end water outlet positions in the zone.
Preferably, at least 3 aeration devices which are communicated with the aeration pipeline and connected in parallel are arranged in the flexible area, and aeration control valves are arranged on the respective parallel pipelines.
The invention has the beneficial effects that: by adopting a multi-point water inlet mode, a carbon source carried in inlet water is fully utilized to participate in denitrification reaction in the rear-end anoxic tank, the content of nitric acid and nitrogen in outlet water is reduced, and the reflux amount of nitrifying liquid can be reduced, so that the energy consumption is reduced.
By arranging a nitric acid nitrogen instrument in the front anoxic zone, the main function of the zone is to carry out denitrification reaction, NO in the wastewater2And NO3Is reduced to N under anoxic conditions and by the action of denitrifying bacteria (facultative heterotrophic bacteria)2The process of (1), which requires the consumption of a carbon source if NO NO is detected in the wastewater2And NO3If the carbon source in the sewage is residual, the return flow of the nitrifying liquid can be increased continuously, otherwise, if NO can be detected in the sewage2Or NO3If the amount of carbon source in the wastewater is insufficient or the dissolved oxygen in the wastewater is too high, it is not preferable to increase the reflux amount of the nitrifying liquid.
The DO (dissolved oxygen) target values of the two areas are respectively controlled by dividing the aerobic tank into the two areas, so that the excessive aeration in the aerobic tank is avoided as much as possible, the aeration adjustment flexibility in the aerobic tank is increased, and meanwhile, the DO value in the flexible area is controlled within an acceptable range by controlling the DO value at the tail end of the area 2 of the aerobic tank.
The DO value in the flexible zone is controlled below 0.5mg/L, so that excessive dissolved oxygen carried by the return nitrification liquid is reduced, the anoxic environment of the front-end denitrification zone is damaged, the carbon source in water is consumed, and the adverse effect on denitrification reaction is caused.
Through set up ammonia nitrogen and nitric acid nitrogen online instrument in the anoxic zone of back, confirm the inflow in the anoxic tank of back according to ammonia nitrogen and nitric acid nitrogen value in detecting the sewage, avoid causing the inflow too much and cause the water data to exceed standard.
The present invention and the conventional A2Compared with the process of the/O treatment system, the method can more fully utilize the carbon source in the inlet water, realize accurate aeration and backflow, and avoid the phenomena of energy consumption waste and unstable water quality or even standard exceeding caused by excessive or insufficient aeration and backflow. Wherein, by adding ammonia nitrogen and nitric acid nitrogen meters in each reaction zone in the tank, the water quality condition in the sewage can be directly and quickly known, so that the relevant instructions can be judged or adjusted in time, and the best water quality of the effluent can be achieved with the minimum operation energy consumption as far as possible; compared with DO detection control, the ammonia nitrogen detection control can directly know the ammonia nitrogen value in the sewage, and the control of aeration ensures that the ammonia nitrogen in the effluent is in a reasonable range, so that excessive aeration or insufficient aeration is prevented; the nitric acid nitrogen instrument is mainly used as a basis for nitrifying liquid backflow and external carbon source addition, and accurate backflow and carbon source adding are achieved.
In summary, the invention aims to provide a method for operating a plant with reasonable structural distribution, economic operation mode and low manual operation intensity2The effluent quality of the/O biochemical system meets the discharge requirement.
[ description of the drawings ]
FIG. 1 is a flow chart of the present invention.
Description of the labeling: 1-anaerobic zone, 2-front anoxic zone, 3-aerobic zone, 3A-aerobic zone, 3B-aerobic zone, 5-flexible zone, 6-rear anoxic zone, 7-secondary sedimentation tank, 8-carbon source control valve, 9-flowmeter, 10-fan, 11-aeration control valve, 12-impeller, 13-aeration equipment, 14-reflux pump, 15-ORP instrument, 16-dissolved oxygen instrument, 17-nitric acid nitrogen instrument, 18-ammonia nitrogen instrument, 19-carbon source feeding storage tank, 20-aeration pipeline, 21-water inlet pipeline, 21A-first water inlet control valve, 21B-second water inlet control valve, 22-carbon source pipeline, 23-reflux pipeline, 24-reflux control valve and 101-water inlet pump.
[ detailed description ] embodiments
The present invention will be described in further detail below with reference to specific embodiments and drawings, but the present invention is not limited to the specific embodiments below.
The following examples are not provided to limit the scope of the present invention, nor are the steps described to limit the order of execution, and the directions described are limited to the drawings. Modifications of the invention which are obvious to those skilled in the art in view of the prior art are also within the scope of the invention as claimed.
Improvement type A of intelligent operation2an/O treatment process and a system thereof, as shown in figure 1, comprises an anaerobic zone 1, an aerobic zone 3, a flexible zone 5, a post-anoxic zone 6, a secondary sedimentation tank 7 and a carbon source feeding storage tank 19 filled with carbon sources, wherein the carbon sources can be methanol or sodium acetate and the like;
a nitric acid nitrogen instrument 17 and an ammonia nitrogen instrument 18 are arranged in the back anoxic zone 6, wherein the nitric acid nitrogen instrument 17 is arranged for detecting the content of nitric acid nitrogen in the water body when water is discharged from the back anoxic zone 6 to judge whether an external carbon source is needed, and the ammonia nitrogen instrument 18 is arranged in the back anoxic zone 6 for detecting the content of ammonia nitrogen in the water body when water is discharged from the back anoxic zone 6 and controlling the water inlet proportion or the water inlet amount of sewage according to the content; the carbon source adding storage tank 19 is introduced into the post-anoxic zone 6 through a carbon source pipeline 22, and a carbon source control valve 8 for adjusting the adding amount of the carbon source is arranged on the carbon source pipeline 22;
the anaerobic zone and the back anoxic zone are respectively communicated with the anaerobic zone 1 and the back anoxic zone 6, and a first water inlet control valve 21A and a second water inlet control valve 21B for controlling water inlet amount are respectively arranged on the first branch and the second branch; and flow meters 9 are also arranged on the pipelines of the denitrification system, and the instruments and the control valves realize coordinated linkage control and regulation through a DCS (distributed control system).
In this embodiment, it is provided with preceding anoxic zone 2 still to communicate between anaerobic zone 1 and the aerobic zone 3, preceding anoxic zone 2 through return line 23 with nimble district 5 intercommunication, be equipped with backwash pump 14 and backflow control valve 24 on the return line 23, through backwash pump 14 and backflow control valve 24's setting, can be with the water in the nimble district 5 in the preceding anoxic zone 2 of backward flow, be equipped with dissolved oxygen instrument table 16 and nitric acid nitrogen instrument 17 in preceding anoxic zone 2, wherein dissolved oxygen instrument table 16 in preceding anoxic zone 2 is used for detecting whether carry dissolved oxygen in the backward flow water and causes the influence to preceding anoxic zone 2, and nitric acid nitrogen instrument 17 is arranged in detecting the content of nitric acid nitrogen in the water of nimble district 5 to the volume of backward flow of water in nimble district 5 provides data reference for DCS control system control.
In this embodiment, the aerobic zone 3 includes an aerobic first zone 3A and an aerobic second zone 3B, and the aerobic first zone 3A and the aerobic second zone 3B are respectively provided with an aeration device 13, a dissolved oxygen meter 16 and an ammonia nitrogen meter 18, wherein the DO of the aerobic first zone 3A is set to be in a normal range of 0.8-1.2 mg/L, the ammonia nitrogen value of the aerobic second zone 3B is set to be in a normal range of 1-2 mg/L, the DO value is less than 0.7mg/L, and the normal range can be set to be in a range of 0.5-0.7 mg/L.
In this embodiment, the anaerobic zone 1, the front anoxic zone 2 and the rear anoxic zone 6 are all provided with flow impellers 12 to assist the flow of the water body.
In the embodiment, the water inlet ratio of the anaerobic zone 1 to the post-anoxic zone 6 is (80-90): (10-20), the priority ratio is 87:13 in the embodiment, so that the treatment speed of the sewage can be accelerated, and the anaerobic zone 1 and the post anoxic zone 6 can be fully utilized, thereby achieving the purpose of saving resources and time.
In this embodiment, an ORP meter 15 is provided in the anaerobic zone 1 so as to be used for judging the oxidation-reduction ability in the sewage.
In this embodiment, the secondary sedimentation tank 7 is respectively communicated with the back anoxic zone 6 and the anaerobic zone 1, the backflow amount of the water in the secondary sedimentation tank 7 that flows back to the anaerobic zone 1 accounts for 40% -95% of the total amount of the water in the secondary sedimentation tank 7, and the rest of the water enters the next treatment unit for treatment. Through communicating the secondary sedimentation tank 7 with the anaerobic zone 1, water which does not reach the standard in the secondary sedimentation tank 7 can flow back to the anaerobic zone 1 again, the water can be better purified, and sewage can be treated to reach the standard.
In this embodiment, a plurality of baffles are arranged in the aerobic zone 3, so that the water can more fully perform the nitration reaction.
In this embodiment, the dissolved oxygen meter 16 and the nitric acid nitrogen meter 17 in the front anoxic zone 2, the dissolved oxygen meter 16 and the ammonia nitrogen meter 18 in the aerobic zone 3, the dissolved oxygen meter 16 and the ammonia nitrogen meter 18 in the flexible zone 5, and the nitric acid nitrogen meter 17 and the ammonia nitrogen meter 18 in the rear anoxic zone 6 are respectively disposed at the tail end water outlet in the zone, so that the content of dissolved oxygen, ammonia nitrogen, nitric acid nitrogen or the like in the water body which is about to enter the next zone unit in the zone can be more easily and accurately measured, and the regulation of the content is facilitated.
In this embodiment, at least 3 parallel aeration apparatuses 13 connected to the aeration pipeline 20 are disposed in the flexible zone 5, the aeration apparatuses 13 are uniformly distributed in the flexible zone 5, and each parallel pipeline is provided with an aeration control valve 11, and the aeration amount of the corresponding aeration apparatus 13 can be conveniently controlled by controlling the aeration control valves 11 on each parallel pipeline. The flexible zone 5 is used as an anoxic zone under normal conditions (all indexes are within a normal range), so that dissolved oxygen carried in the reflux nitrification liquid can be reduced, and the denitrification effect in the front anoxic zone 2 is influenced and the carbon source of the inlet water is consumed; the aeration period in the flexible zone 5 is two hours, the aeration duration is 1 minute, thus preventing the sludge in the zone from settling and avoiding the blockage of the aeration disc, and if the ammonia nitrogen concentration of the inlet water suddenly rises or the water inlet amount increases, the number of aeration devices 13 can be selected to be started according to actual conditions, and the aeration amount is adjusted through the corresponding aeration control valve 11, so that the zone becomes an aeration zone. Thus being beneficial to quickly and accurately controlling the contents of ammonia nitrogen and nitric acid nitrogen in the water body. The ammonia nitrogen meter 18 and the dissolved oxygen meter 16 in the area are respectively used for detecting the ammonia nitrogen value and the dissolved oxygen content in the area, wherein the dissolved oxygen in the flexible area 5 is required to be lower than 0.5mg/L, and the ammonia nitrogen meter 18 is used for feeding back whether the aeration amount of the aeration equipment 13 in the area needs to be increased.
In order to more clearly describe the embodiments of the present invention, the following experimental cases are now provided:
making an A according to the technique of the invention2The water inlet of the device is pretreated water outlet of a certain municipal sewage treatment plant, and specific experimental data and results are as follows:
the quality of the effluent water pretreated by the sewage plant is as follows: the PH value is 6.7-7.3, the temperature is 25-29 ℃, the ammonia nitrogen value is 23-40 mg/L, the total nitrogen value is 25-45 mg/L, and the COD value is 120-243 mg/L.
Delivering the pretreated effluent to A through a water inlet pump2In the O treatment apparatus, the total amount of water treated was 1m3The anaerobic and post-anoxic water inlet ratio is 9: 1; the DO set value of the aerobic tank 1 area is 1.0 mg/L; the ammonia nitrogen setting value of the 2-zone aerobic tank is 1.5 mg/L; the flexible zone is mainly used as an anoxic zone, aeration is carried out intermittently, the aeration period is 2 hours, and the aeration duration is 1 minute; the nitrogen nitrate value of the back anoxic zone is set within the range of 2-4 mg/L.
During the operation, data collected by all probes are fed back into the control system, the system can give out an operation instruction according to the collected data, wherein if the detection value of the nitric acid nitrogen in the front anoxic zone 2 is lower than 1mg/L (lasts for more than 10 minutes), the system can give out an instruction for increasing the reflux of the nitrified liquid and increasing the internal reflux amount, and if the detection value is higher than 3mg/L and lasts for more than 10 minutes, the system can give out an instruction for reducing the reflux amount of the nitrified liquid and reducing the internal reflux amount; the aeration quantity in the aerobic tank is determined by DO value detected in the tank, in addition, the aeration valves of the zone 1 and the zone 2 can adjust the opening degree according to the DO conditions in the two tanks, if the DO value detected in the zone 1 is 1.4mg/L and the DO detection value in the zone 2 is 0.3mg/L, the total aeration valve of the zone 1 can be properly reduced, on the contrary, the total aeration valve of the zone 2 can be properly increased, the DO detection values of the zone 1 and the zone 2 are kept near the set value as much as possible, if the DO value of the two zones after adjustment is smaller than the set value, the aeration quantity can be increased by a fan, otherwise, the total aeration quantity can be reduced until the detection value is approximately equal to the set value (positive and negative deviation is 0.1 mg/L); the ammonia nitrogen setting value range in the flexible area is 1.5-2.5 mg/L, the water inlet proportion of the anoxic tank is increased when the ammonia nitrogen setting value is lower than 1.5mg/L, the water inlet proportion of the anoxic tank is reduced when the ammonia nitrogen setting value is larger than 2.5mg/L, the nitrogen nitrate detection value range is 2-4 mg/L, when the nitrogen nitrate value is higher than 4mg/L, an additional carbon source is needed, and when the nitrogen nitrate value is smaller than 2mg/L, the carbon source adding amount is reduced.
The invention stably runs for 4 months and has a detection data list:
remarking: wherein EG represents a test group, CG represents a control group, and the water quality and the treatment capacity of inlet water of the test group and the control group are the same.
The invention stably runs for 4 months and has a summary of comparison data of energy consumption:
remarking: 1. the power consumption is power consumption of the biochemical battery;
2. the purity of the methanol (carbon source) is more than 99 percent, and the methanol (carbon source) is diluted and added.
The analysis table shows that compared with the synchronous operation data of the sewage plant, the total nitrogen removal rate is higher and other data are basically consistent by using the denitrification system to treat sewage compared with the traditional denitrification system; in addition, the ton water power consumption of the denitrification system can be saved by 24 percent (biochemical section), the external carbon source is saved by 43 percent, and the effluent quality (mainly total nitrogen) is better.
Claims (10)
1. An intelligent aeration denitrification system is characterized by comprising an anaerobic zone (1), an aerobic zone (3), a flexible zone (5), a back anoxic zone (6), a secondary sedimentation tank (7) and a carbon source feeding storage tank (19) which are sequentially communicated; aeration equipment (13), a dissolved oxygen meter (16) and an ammonia nitrogen meter (18) are arranged in the aerobic zone (3) and the flexible zone (5), and the aeration equipment (13) is connected with a fan (10) through an aeration pipeline (20); aeration control valves (11) for controlling the aeration amount of the aeration equipment (13) are correspondingly arranged on the aeration pipelines (20);
a nitric acid nitrogen instrument (17) and an ammonia nitrogen instrument (18) are arranged in the back anoxic zone (6), the carbon source adding storage tank (19) is introduced into the back anoxic zone (6) through a carbon source pipeline (22), and a carbon source control valve (8) for adjusting the adding amount of the carbon source is arranged on the carbon source pipeline (22);
the anaerobic treatment device is characterized by further comprising a water inlet pipeline (21) with a water inlet pump (101) arranged at one end, a first branch and a second branch of the water inlet pipeline (21) are respectively communicated with the anaerobic zone (1) and the back anoxic zone (6), and a first water inlet control valve (21A) and a second water inlet control valve (21B) for controlling water inflow are respectively arranged on the first branch and the second branch;
and the instruments and the control valves are cooperatively controlled and adjusted through a DCS (distributed control system).
2. An intelligent aeration denitrification system according to claim 1, wherein a front anoxic zone (2) is communicated between the anaerobic zone (1) and the aerobic zone (3), the front anoxic zone (2) is communicated with the flexible zone (5) through a return pipeline (23), and a return pump (14) and a return control valve (24) are arranged on the return pipeline (23).
3. The intelligent aeration denitrification system according to claim 2, wherein a dissolved oxygen meter (16) and a nitric acid nitrogen meter (17) are arranged in the front anoxic zone (2).
4. The intelligent aeration denitrification system according to claim 1 or 2, wherein the aerobic zone (3) comprises an aerobic first zone (3A) and an aerobic second zone (3B), and an aeration device (13), a dissolved oxygen meter (16) and an ammonia nitrogen meter (18) are arranged in each of the aerobic first zone (3A) and the aerobic second zone (3B).
5. The intelligent aeration denitrification system according to claim 2 or 3, wherein the anaerobic zone (1), the front anoxic zone (2) and the rear anoxic zone (6) are all provided with flow impellers (12).
6. The intelligent aeration denitrification system according to the claim 1, wherein the water inlet ratio of the anaerobic zone (1) to the post-anoxic zone (6) is (80-90) through the water inlet pipeline (21): (10-20).
7. The intelligent aeration denitrification system according to the claim 1, wherein an ORP meter (15) for judging the oxidation reduction capability of the sewage is arranged in the anaerobic zone (1).
8. The intelligent aeration denitrification system according to claim 1, wherein the secondary sedimentation tank (7) is respectively communicated with the post anoxic zone (6) and the anaerobic zone (1).
9. The intelligent aeration denitrification system of claim 3, wherein the dissolved oxygen meter (16) and the nitric acid nitrogen meter (17) in the front anoxic zone (2), the dissolved oxygen meter (16) and the ammonia nitrogen meter (18) in the aerobic zone (3), the dissolved oxygen meter (16) and the ammonia nitrogen meter (18) in the flexible zone (5), and the nitric acid nitrogen meter (17) and the ammonia nitrogen meter (18) in the rear anoxic zone (6) are respectively arranged at the tail end water outlet in the zone.
10. An intelligent aeration denitrification system according to claim 1, wherein at least 3 aeration devices (13) which are communicated with the aeration pipeline (20) and connected in parallel are arranged in the flexible zone (5), and each parallel pipeline is provided with an aeration control valve (11).
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