CN110482686B - Consumption-reducing and efficiency-improving system and method suitable for biological denitrification of oxidation ditch - Google Patents
Consumption-reducing and efficiency-improving system and method suitable for biological denitrification of oxidation ditch Download PDFInfo
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- CN110482686B CN110482686B CN201910753385.1A CN201910753385A CN110482686B CN 110482686 B CN110482686 B CN 110482686B CN 201910753385 A CN201910753385 A CN 201910753385A CN 110482686 B CN110482686 B CN 110482686B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000003647 oxidation Effects 0.000 title claims abstract description 26
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 26
- 238000005273 aeration Methods 0.000 claims abstract description 97
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 86
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 84
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000000523 sample Substances 0.000 claims abstract description 78
- 239000010865 sewage Substances 0.000 claims abstract description 77
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 29
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 238000004062 sedimentation Methods 0.000 claims description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 9
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical group [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 claims description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims description 9
- 239000010802 sludge Substances 0.000 claims description 9
- 235000017281 sodium acetate Nutrition 0.000 claims description 9
- 239000001632 sodium acetate Substances 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- VGPSUIRIPDYGFV-UHFFFAOYSA-N [N].O[N+]([O-])=O Chemical compound [N].O[N+]([O-])=O VGPSUIRIPDYGFV-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C02F3/1257—Oxidation ditches
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to the field of sewage treatment, in particular to a consumption-reducing and efficiency-improving system and method suitable for biological denitrification of an oxidation ditch, which are characterized in that: the device comprises a biological reaction zone, wherein the biological reaction zone is divided into a non-aeration zone and an aeration zone; the water inlet is communicated with a water inlet pump through a sewage inlet pipe, a sewage flowmeter is arranged on the sewage inlet pipe, a nitrate nitrogen probe and an ORP probe are arranged in a non-aeration area, and an ammonia nitrogen probe and a DO probe are also arranged in an aeration area; the system also comprises a carbon source storage tank filled with a carbon source, wherein the carbon source storage tank is communicated with the non-aeration zone through a carbon source feeding pipe, and a flow control valve and a flow meter are sequentially arranged on the carbon source feeding pipe; the water inlet pump, the sewage flowmeter, the nitrate nitrogen probe, the ORP probe, the ammonia nitrogen probe, the DO probe, the flow regulating valve and the flowmeter are respectively connected with the PLC in a communication mode. By the system and the method, the aeration quantity and the carbon source addition quantity in the biological denitrification process can be accurately controlled, and the balance between nitrification and denitrification is controlled so as to improve the sewage treatment effect.
Description
[ field of technology ]
The invention belongs to the field of sewage treatment, and particularly relates to a consumption-reducing and efficiency-improving system and method suitable for biological denitrification of an oxidation ditch.
[ background Art ]
Along with the increasing environmental pollution, the national importance of environmental protection is higher, and the first-level A standard in the pollutant emission standard of urban sewage treatment plants is started to be implemented in various places in recent years, and TN (total nitrogen content) is mainly controlled strictly. In the face of increasingly higher effluent standards, engineering measures for improving the standard of sewage are adopted in sewage plants in all places so as to realize that the effluent quality reaches the new emission standard, but the ton water treatment cost is increased along with the increase of the process flow.
In the current sewage treatment process, biological denitrification of an oxidation ditch is an essential important link. Biological denitrification is divided into two parts: nitrifying bacteria in an aeration environment to convert TKN (total Kjeldahl nitrogen) into nitrate nitrogen; then denitrifying bacteria perform denitrification under the anoxic condition, and the carbon source is utilized to convert nitrate nitrogen into nitrogen, so that the aim of removing total nitrogen is fulfilled.
In the traditional process design and operation process, people rely on experience parameters of aeration quantity, aeration area, carbon source addition quantity and the like, so that each process parameter is difficult to control in a reasonable interval. Especially in the process of removing total nitrogen, the relationship between the nitrification and the denitrification is difficult to control by operators, so that excessive consumption of carbon sources and aeration air quantity and operation cost are increased, and the effluent quality can not reach an ideal target.
Therefore, the method is an industrial improvement to the existing biological denitrification link, and has important significance to the upgrading and reconstruction engineering of the sewage plant.
[ invention ]
The invention provides a consumption-reducing and efficiency-improving system suitable for biological denitrification of an oxidation ditch, which can accurately control aeration amount and carbon source addition amount in the biological denitrification process, and control balance between nitrification and denitrification so as to improve sewage treatment effect.
In order to achieve the above purpose, the present invention provides the following technical solutions: a system suitable for oxidation ditch biological denitrification for reducing consumption and improving efficiency is characterized in that: the biological reaction zone is divided into a non-aeration zone close to the water inlet side at the front end and an aeration zone close to the water outlet side at the rear end and provided with an aeration device; the sewage inlet is communicated with a water inlet pump for pumping sewage into the non-aeration zone through a sewage inlet pipe, a sewage flowmeter is arranged on the sewage inlet pipe, a nitrate nitrogen probe for detecting the nitrate nitrogen content in sewage and an ORP probe for detecting the ORP content in sewage are arranged in the non-aeration zone, and an ammonia nitrogen probe for detecting the ammonia nitrogen content in sewage and a DO probe for detecting the DO content in sewage are also arranged in the aeration zone; the system also comprises a carbon source storage tank filled with a carbon source, wherein the carbon source storage tank is communicated with the non-aeration zone through a carbon source feeding pipe, and a flow control valve and a flow meter are sequentially arranged on the carbon source feeding pipe; the water inlet pump, the sewage flowmeter, the nitrate nitrogen probe, the ORP probe, the ammonia nitrogen probe, the DO probe, the flow regulating valve and the flowmeter are respectively connected with the PLC in a communication mode.
Preferably, the area ratio of the aeration area to the non-aeration area is 1:3.
Preferably, the aeration device comprises an aeration disc, the aeration disc is connected with a fan, and the fan is in communication connection with the PLC.
Preferably, the carbon source is sodium acetate solution or methanol solution.
Preferably, the PLC controller comprises an AI module for respectively collecting and judging whether the nitrate nitrogen content, the ORP content, the ammonia nitrogen content and the DO content in the sewage detected by the nitrate nitrogen probe, the ORP probe, the ammonia nitrogen probe and the DO probe are in the respective corresponding set target value ranges; and the AO module is in communication connection with the AI module and controls the flow of the water inlet pump, the opening of the flow regulating valve and the air quantity of the fan according to the judgment result of the AI module.
Preferably, a pusher is arranged in the non-aeration area along the flowing direction of the water flow, and the pusher is in communication connection with the PLC and controls the switch of the pusher through the PLC.
Preferably, the sewage treatment device further comprises a sedimentation tank, the upper end of the sedimentation tank is communicated with the water outlet, a first output pipeline and a second output pipeline are communicated with the bottom end of the sedimentation tank, the first output pipeline is communicated with the non-aeration area through a reflux pump, and the second output pipeline is communicated with the sludge treatment system.
The invention also provides a consumption-reducing and efficiency-improving method which is suitable for biological denitrification of an oxidation ditch and utilizes the system, and can accurately control the aeration quantity and the carbon source addition quantity in the biological denitrification process, and is characterized in that: the method comprises the following steps:
(1) Carbon source adding section:
(a) The nitrate nitrogen probe and the ORP probe respectively acquire the nitrate nitrogen content and the ORP content in the sewage in the non-aeration area in real time and then send the nitrate nitrogen content and the ORP content to the PLC;
(b) The PLC controller judges whether the nitrate nitrogen content and the ORP content are respectively in a set nitrate nitrogen target value range and an ORP target value range;
(c) If the nitrate nitrogen content value is less than the nitrate nitrogen target value range or the ORP content value is less than the OPR target value range, the PLC controller controls the flow regulating valve to reduce the carbon source adding amount in a non-aeration zone, and then the step (a) is continued;
(d) If the nitrate nitrogen content value is greater than the nitrate nitrogen target value range or the ORP content value is greater than the OPR target value range, the PLC controller controls the flow regulating valve to increase the carbon source adding amount in the non-aeration zone, and then the step (a) is continued;
(2) Aeration control section:
(e) The ammonia nitrogen probe and the DO probe respectively acquire the ammonia nitrogen content and the DO content in the sewage in the aeration zone in real time and then send the ammonia nitrogen content and the DO content to the PLC;
(f) The PLC controller judges whether the ammonia nitrogen content and the DO content are respectively in a set ammonia nitrogen target value range and a set DO target value range;
(g) If the ammonia nitrogen content value is smaller than the ammonia nitrogen target value range and the DO content value is higher than the DO target value range, the PLC controls the fan to reduce the output air quantity, and then the step (e) is continued;
(h) If the ammonia nitrogen content value is larger than the ammonia nitrogen target value range and the DO content value is lower than the DO target value range, the PLC controls the fan to increase the output air quantity, and then the step (e) is continued;
(i) If the detected ammonia nitrogen content value still continues to increase and the DO content value still continues to decrease after the output air volume of the fan reaches the maximum, the PLC controller controls the water inlet pump to gradually reduce the water inlet volume, and then the step (e) is continued;
(j) If the detected ammonia nitrogen content value still continues to decrease and the DO content value still continues to increase after the output air volume of the fan is reduced to the minimum, the PLC controller controls the water inlet pump to gradually increase the water inlet amount, and then the step (e) is continued
Preferably, the nitrate nitrogen target value range includes a lower limit value, a target value and an upper limit value, and when the nitrate nitrogen content value detected by the nitrate nitrogen probe is between the lower limit value and the upper limit value, the dosing rate of the carbon source is continuously maintained.
Preferably, the PLC controller is provided with a carbon source addition amount program including the following formula:
N＝C1—C2 (2)
qm-amount of carbon source solution added, m 3 /h
Cm-concentration of external carbon source solution added, mg/L
N-concentration of nitrogen to be removed by denitrification with external carbon source, mg/L
5-denitrification 1kg of nitric acid requires additional carbon source quantity (calculated by COD), kg COD/kg NO3
a-COD value, g/g, corresponding to the externally added carbon source.
Concentration of b-carbon source solution
Q-the amount of treated water, m 3 /h
Measurement of nitric acid concentration in C1-biological reaction zone, mg/L
The concentration of nitric acid in the C2-biological reaction zone is controlled to reach the target value, mg/L
And judging the addition amount of the carbon source through the formula.
The beneficial effects of the invention are as follows: by arranging the non-aeration area on one side close to the water inlet, one side close to the water inlet is an anoxic area, and the nitrate nitrogen in the area is sufficient, so that denitrification is conveniently carried out with a carbon source introduced into sewage, and the nitrate nitrogen in the sewage is effectively removed. In addition, denitrification is carried out at one side of the water inlet end, so that on one hand, carbon sources in sewage participate in denitrification, COD (chemical oxygen demand) of a biochemical pool is reduced, load is removed, and a large amount of aeration is saved; on the other hand, the oxygen in the nitrate nitrogen can be fully utilized to provide oxygen demand for the subsequent removal of COD.
The aeration zone with a smaller area is arranged at the rear end of the non-aeration zone, so that ammonia nitrogen in sewage can be converted into nitrate nitrogen, and partial COD can be degraded; the ammonia nitrogen probe and the DO probe are arranged at the rear end of the aeration zone, so that the ammonia nitrogen value and the DO value in the sewage can be accurately detected, and the ammonia nitrogen value can be controlled within a reasonable range through the control of the PLC to the fan, so that excessive aeration is avoided; in addition, through the analysis of the detection values of ammonia nitrogen and DO, whether the abnormal phenomenon exists in the biological reaction zone or not can be timely judged, for example, when the detected ammonia nitrogen value and DO value are both higher, the concentration of the activated sludge is lower. In addition, the real oxygen demand of the aeration area can be reflected more timely and accurately by comparing the detected ammonia nitrogen value with the DO value, thereby achieving the purposes of timely adjusting the aeration amount and saving the aeration.
In a word, compared with the aeration mode of the traditional oxidation ditch, the layout of the non-aeration area is more beneficial to denitrification of carbon sources in sewage; compared with the traditional manual rough carbon source adding control, the invention can accurately and quickly control the adding amount of the carbon source by the linkage operation of the PLC controller, the nitrate nitrogen probe and the flow control valve for controlling the adding amount of the carbon source, and prevent unnecessary consumption caused by the fact that the nitrate nitrogen cannot be effectively degraded and the carbon source is excessively added due to insufficient adding of the carbon source; compared with the traditional DO control aeration, the method combines ammonia nitrogen detection and DO detection, can reflect concentration change of pollutants in an oxidation ditch more timely, realizes linkage control between a PLC and each device, further realizes accurate control of carbon source addition amount and aeration amount, has high automation degree, greatly reduces operation energy consumption, and improves working efficiency to a certain extent.
[ description of the drawings ]
Fig. 1 is a schematic overall structure of an embodiment of the present invention.
FIG. 2 is a plan view of a biological reaction zone according to an embodiment of the present invention.
FIG. 3 is a flow chart of an embodiment of the present invention.
Labeling and describing: 1. a water inlet; 2. a water outlet; 3. a non-aeration zone; 4. an aeration zone; 5. a water inlet pump; 6. a nitrate nitrogen probe; orp probe; 8. an ammonia nitrogen probe; DO probe; 10. a carbon source storage tank; 11. a carbon source feeding pipe; 12. a flow control valve; 13. an aeration disc; 14. a blower; 15. a flow impeller; 16. a sedimentation tank; 17. a first output conduit; 18. a second output conduit; 19. a reflux pump; 20-a flow meter; 21. a sewage inlet pipe; 22. a sewage flow meter; a plc controller.
[ detailed description ] of the invention
The present invention will be described in further detail with reference to the following specific examples, but the present invention is not limited to the following specific examples.
The following examples are provided not to limit the scope of the invention nor the order of execution of the steps described, and the directions described are limited to the drawings. The present invention is obviously modified by those skilled in the art in combination with the prior common general knowledge, and also falls within the scope of protection claimed by the present invention.
The system for reducing consumption and improving efficiency suitable for biological denitrification of an oxidation ditch comprises a biological reaction zone, wherein the biological reaction zone is divided into a non-aeration zone 3 at one side close to a front water inlet 1 and an aeration zone 4 at one side close to a rear water outlet 2 and provided with an aeration device; the sewage inlet 1 is communicated with a water inlet pump 5 for pumping sewage into the non-aeration zone 3 through a sewage inlet pipe 21, a sewage flowmeter 22 is arranged on the sewage inlet pipe 21, a nitrate nitrogen probe 6 for detecting the nitrate nitrogen content in sewage and an ORP probe 7 for detecting the ORP content in sewage are arranged in the non-aeration zone 3, in order to accurately detect the nitrate nitrogen value and the ORP value in sewage, the nitrate nitrogen probe 6 and the ORP probe 7 are arranged on one side of the non-aeration zone 3 close to the water inlet 1, an aeration device, an ammonia nitrogen probe 8 for detecting the ammonia nitrogen content in sewage and a DO probe 9 for detecting the DO content in sewage are arranged in the aeration zone 4, and in order to accurately detect the ammonia nitrogen value and the DO value in sewage, the ammonia nitrogen probe 8 and the DO probe 9 are arranged on one side of the aeration zone 4 close to the water outlet 2; the system further comprises a carbon source storage tank 10 filled with a carbon source, wherein the carbon source storage tank 10 is communicated with the non-aeration zone 3 through a carbon source feeding pipe 11, a flow control valve 12 and a flow meter 20 are sequentially arranged on the carbon source feeding pipe 11, specifically, the flow meter 20 is arranged on the carbon source feeding pipe 11, and the flow control valve 12 is arranged on the carbon source feeding pipe 11 between the carbon source storage tank 10 and the flow meter 20; the water inlet pump 5, the sewage flowmeter 22, the nitrate nitrogen probe 6, the ORP probe 7, the ammonia nitrogen probe 8, the DO probe 9, the flow regulating valve 12 and the flowmeter 20 are respectively in communication connection with the PLC 101. The water inlet pump 5 is a variable frequency water pump, and the working frequency of the water inlet pump is controlled by the PLC 101.
Further, in order to make the nitrification reaction and denitrification reaction of the sewage in the biological reaction zone more thoroughly proceed, the area ratio of the aeration zone 4 to the non-aeration zone 3 is 1:3.
Further, the aeration device comprises an aeration disc 13, the aeration disc is connected with a fan 14, the fan 14 is in communication connection with the PLC 101, the fan 14 is a variable frequency fan, and the working frequency of the fan is controlled by the PLC 101.
Further, the carbon source is sodium acetate solution or methanol solution.
Further, the PLC controller 101 includes an AI module and an AO module communicatively connected to the AI module, where a target nitrogen content range, an ORP content target range, an ammonia nitrogen content target range, and a DO content target range are set in the AI module, and the AI module is configured to collect flow data of the flow control valve 12 and data of the nitrogen content, the ORP content, the ammonia nitrogen content, and the DO content in the sewage detected by the nitrogen probe 6, the ORP probe 7, the ammonia nitrogen probe 8, and the DO probe 9, and determine whether the nitrogen content, the ORP content, the ammonia nitrogen content, and the DO content in the sewage detected by the nitrogen probe 6, the ORP probe 7, the ammonia nitrogen probe 8, and the DO probe 9 are all within respective corresponding target content ranges; and the AO module correspondingly controls the flow of the water inlet pump 5, the opening of the flow regulating valve 12 and the air quantity of the fan 14 according to the judgment result of the AI module.
Further, in order to increase the flow rate of the sewage in the biological reaction zone, a pusher 15 is disposed in the non-aeration zone along the flow direction of the water, and the pusher 15 is communicatively connected to the PLC controller 101 and controls the on/off of the pusher 15 through the PLC controller 101. Specifically, the impeller of the impeller 15 is driven by a variable frequency motor, and the PLC 101 controls the rotation speed of the impeller 15 by controlling the working frequency of the variable frequency motor, so as to achieve the purpose of adjusting the sewage flow rate in the biological reaction zone.
Further, the sewage treatment device also comprises a sedimentation tank 16, the upper end of which is communicated with the water outlet 2, sewage treated by the biological reaction zone enters the sedimentation tank 16 for sedimentation, a first output pipeline 17 and a second output pipeline 18 are communicated with the bottom end of the sedimentation tank 16, the first output pipeline 17 is communicated with the non-aeration zone 3 through a reflux pump 19, and the second output pipeline 18 is communicated with a sludge treatment system. A part of the sludge in the sedimentation tank is returned to the non-aeration zone 3 through a first output pipe 17, and another part of the sludge is pumped into a sludge treatment system through a second output pipe 18 for treatment.
The invention also provides a consumption-reducing and efficiency-improving method which is suitable for biological denitrification of an oxidation ditch and utilizes the system, and can accurately control the aeration quantity and the carbon source addition quantity in the biological denitrification process, and is characterized in that: the method comprises the following steps:
(1) Carbon source adding section:
(a) The nitrate nitrogen probe 6 and the ORP probe 7 respectively acquire the nitrate nitrogen content and the ORP content in the sewage in the non-aeration zone 3 in real time and then send the nitrate nitrogen content and the ORP content to the PLC 101;
(b) The PLC controller 101 determines whether the nitrate nitrogen content and ORP content are within a set nitrate nitrogen target value range and ORP target value range, respectively;
(c) If the nitrate nitrogen content value is less than the nitrate nitrogen target value range or the ORP content value is less than the OPR target value range, the PLC controller 101 controls the flow rate adjustment valve 12 to reduce the carbon source addition amount in the non-aeration zone 3, and then proceeds to step (a);
(d) If the nitrate nitrogen content value is greater than the nitrate nitrogen target value range or the ORP content value is greater than the OPR target value range, the PLC controller 101 controls the flow rate adjustment valve 12 to increase the carbon source addition amount in the non-aeration zone 3, and then proceeds to step (a);
(2) Aeration control section:
(e) The ammonia nitrogen probe 8 and the DO probe 9 respectively acquire the ammonia nitrogen content and the DO content in the sewage in the aeration zone 4 in real time and then send the ammonia nitrogen content and the DO content to the PLC 101;
(f) The PLC 101 judges whether the ammonia nitrogen content and the DO content are respectively in a set ammonia nitrogen target value range and a set DO target value range;
(g) If the ammonia nitrogen content value is smaller than the ammonia nitrogen target value range, and meanwhile, the DO content value is higher than the DO target value range, the PLC 101 controls the fan 14 to reduce the output air quantity, and then the step (e) is continued;
(h) If the ammonia nitrogen content value is greater than the ammonia nitrogen target value range, and meanwhile, the DO content value is lower than the DO target value range, the PLC 101 controls the fan 14 to increase the output air quantity, and then the step (5) is continued;
(i) If the detected ammonia nitrogen content value still continues to increase and the DO content value still continues to decrease after the output air volume of the fan 14 reaches the maximum, the PLC controller 101 controls the water inlet pump 5 to gradually decrease the water inlet amount, and then the step (e) is continued;
(j) If the detected ammonia nitrogen content value still continues to decrease and the DO content value still continues to increase after the output air volume of the blower 14 decreases to the minimum, the PLC controller 101 controls the water intake pump 5 to gradually increase the water intake, and then step (e) is continued.
Further, the nitrate nitrogen target value range includes a lower limit value, a target value and an upper limit value, and when the nitrate nitrogen content value detected by the nitrate nitrogen probe 6 is between the lower limit value and the upper limit value, the adding rate of the carbon source is continuously maintained.
Further, the PLC controller 101 is provided with a carbon source addition amount program including the following formula:
N＝C1—C2 (2)
qm-amount of carbon source solution added, m 3 /h
Cm-concentration of external carbon source solution added, mg/L
N-concentration of nitrogen to be removed by denitrification with external carbon source, mg/L
5-denitrification 1kg of nitric acid requires additional carbon source quantity (calculated by COD), kg COD/kg NO3
a-COD value, g/g, corresponding to the externally added carbon source.
Concentration of b-carbon source solution
Q-the amount of treated water, m 3 /h
Measurement of nitric acid concentration in C1-biological reaction zone, mg/L
The concentration of nitric acid in the C2-biological reaction zone is controlled to reach the target value, mg/L
And judging the addition amount of the carbon source through the formula. Wherein Q can be measured by a sewage flow meter; c1 can be measured by a nitrate nitrogen probe; c2 is a target value to be reached by controlling the concentration of nitric acid in the biological reaction zone which is set in advance.
For a clearer description of the embodiments of the present invention, the following experimental cases are now provided:
the technical scheme of the invention is used for carrying out experiments on surviving sewage treatment plants in certain towns, and the standard executed by the plants is the first-level A standard in pollutant emission standard of urban sewage treatment plants, one oxidation ditch is adopted for the experiments, and the related experimental data are as follows:
the PH of raw sewage pumped into an oxidation ditch (namely a biological reaction zone) by a water inlet pump 5 is between 6.5 and 7.5, the temperature is between 25 and 30 ℃, the ammonia nitrogen value is between 20 and 40mg/L, the total nitrogen value is between 23 and 45mg/L, the COD value is between 160 and 380mg/L, and the effective volume of the biological reaction zone is 8000m 3 。
The aeration area 4 at the bottom of the existing oxidation ditch in the factory accounts for about 75% of the whole ditch, and 8 valves are used for respectively controlling the aeration area 4, so that the technical requirements of the invention on the aeration area 4 can be realized by adjusting the opening and closing of the valves, and other process conditions, such as the position of the returned sludge of the sedimentation tank 16, the return quantity and the like, also accord with the technical requirements of the invention.
Setting the ammonia nitrogen value of the effluent of the biological reaction zone to be 1.5-2.5 mg/L, the ammonia nitrogen deviation correction value to be 2mg/L and the positive and negative deviation to be 0.2mg/L; the lower limit value of the nitrate nitrogen is 5mg/L, the upper limit value of the nitrate nitrogen is 7mg/L, the target value of the nitrate nitrogen is 6mg/L, and when the ammonia nitrogen in the effluent is lower than 5mg/L by combining theory and practical experience, the COD of the effluent of the plant is lower than 60mg/L, so that whether the COD exceeds the standard or not is not considered, and only the ammonia nitrogen is ensured to be not exceeded. The effective adjusting range of the fan is 35-55 HZ.
During operation, the ammonia nitrogen probe 8 and the DO probe 9 collect the ammonia nitrogen value and the DO value of the sewage in the aeration zone 4, if the collected ammonia nitrogen values are lower than 1.5mg/L in 10 minutes, and have no rising trend, the PLC 101 gives an instruction for reducing the air quantity to the fan 14, the frequency is reduced by 2 Hz on the existing basis, and if the ammonia nitrogen value is still lower than 2mg/L in 1 hour after adjustment, the output frequency of the fan 14 is continuously regulated until the ammonia nitrogen value is about 2mg/L; otherwise, if the detected ammonia nitrogen value is continuously higher than 2.5mg/L, the frequency of the fan 14 is increased by 2 Hz each time, the fan is stabilized for 1 hour after each adjustment, and the ammonia nitrogen value is controlled to be about 2mg/L by the target.
During operation, the nitrate nitrogen probe 6 collects the nitrate nitrogen value of the sewage in the non-aeration zone 3, when the collected data is 7.3mg/L and the time exceeding 7mg/L is more than 10 minutes, the carbon source adding amount needs to be adjusted, and the water treatment amount is 836m 3 In the experiment, sodium acetate solution is used as an external carbon source, and the specific calculation mode is as follows
N＝C 1 —C 2 ＝7.3-6＝1.3mg/L (1)
Q m The amount of sodium acetate solution added, m 3 /h
C m External sodium acetate, mg/L, which must be added
N-concentration of nitrogen to be removed by denitrification with external carbon source, mg/L
5-denitrification 1kg of nitrate nitrogen requires additional carbon source quantity (calculated by COD), kg COD/kg NO 3
0.68-unit sodium acetate solution corresponds to COD value, g/g
Concentration of sodium acetate solution at ratio of 30%
Q-the amount of treated water, m 3 /h
C 1 Measurement of the nitrate nitrogen concentration in a biochemical tank, mg/L
C 2 Control value of nitrate nitrogen concentration in biochemical pool, mg/L
By calculation, the adding amount of the carbon source sodium acetate solution needs to be increased by 0.27m 3 /h。
During operation, if the ammonia nitrogen value detected in the oxidation ditch is still higher than 2.5mg/L and has an ascending trend when the fan 14 runs at full load, and meanwhile, the DO value is lower than 0.8mg/L, the PLC 101 can send out a command for reducing the water inflow, and simultaneously, the flow of the water inlet pump 5 is controlled to be reduced, so that the harm of water quality impact to a biochemical treatment system is timely prevented; otherwise, if the aeration amount is at the minimum, the ammonia nitrogen in the effluent is still lower than 1.5mg/L, the PLC 101 will send out the instruction of increasing the water amount, and meanwhile, the flow of the water inlet pump 5 is controlled to be increased, so that the water quality of the effluent is controlled to be within the expected range as much as possible.
During operation, if the ammonia nitrogen value is detected to be higher than 4mg/L and the DO value is detected to be higher than 2mg/L, the system gives an alarm to prompt the problem of the biochemical treatment system, and the problem is likely that the sludge quantity in the biological reaction zone is too small to treat the corresponding organic pollutants.
The invention stably operates for 6 months the detection data list:
compared with other oxidation ditches for treating the same sewage at the same time, the technical scheme of the invention saves aeration by about 28 percent, saves carbon source addition by about 30 percent and has better effluent quality compared with the oxidation ditches of the traditional process.
Claims (7)
1. A consumption-reducing and efficiency-improving method suitable for biological denitrification of an oxidation ditch is characterized by comprising the following steps of: the method comprises the steps of utilizing a consumption-reducing and efficiency-improving system suitable for biological denitrification of an oxidation ditch, wherein the system comprises a biological reaction zone, and the biological reaction zone is divided into a non-aeration zone close to a water inlet at the front end and an aeration zone close to a water outlet at the rear end and provided with an aeration device; the sewage inlet is communicated with a water inlet pump for pumping sewage into the non-aeration zone through a sewage inlet pipe, a sewage flowmeter is arranged on the sewage inlet pipe, a nitrate nitrogen probe for detecting the nitrate nitrogen content in sewage and an ORP probe for detecting the ORP content in sewage are arranged in the non-aeration zone, and an ammonia nitrogen probe for detecting the ammonia nitrogen content in sewage and a DO probe for detecting the DO content in sewage are also arranged in the aeration zone; the system also comprises a carbon source storage tank filled with a carbon source, wherein the carbon source storage tank is communicated with the non-aeration zone through a carbon source feeding pipe, and a flow control valve and a flow meter are sequentially arranged on the carbon source feeding pipe; the water inlet pump, the sewage flowmeter, the nitrate nitrogen probe, the ORP probe, the ammonia nitrogen probe, the DO probe, the flow regulating valve and the flowmeter are respectively in communication connection with the PLC controller;
the method comprises the following steps:
(1) Carbon source adding section:
(a) The nitrate nitrogen probe and the ORP probe respectively acquire the nitrate nitrogen content and the ORP content in the sewage in the non-aeration area in real time and then send the nitrate nitrogen content and the ORP content to the PLC;
(b) The PLC controller judges whether the nitrate nitrogen content and the ORP content are respectively in a set nitrate nitrogen target value range and an ORP target value range;
(c) If the nitrate nitrogen content value is smaller than the nitrate nitrogen target value range or the ORP content value is smaller than the ORP target value range, the PLC controls the flow regulating valve to reduce the carbon source adding amount in the non-aeration zone, and then the step (a) is continued;
(d) If the nitrate nitrogen content value is greater than the nitrate nitrogen target value range or the ORP content value is greater than the ORP target value range, the PLC controller controls the flow regulating valve to increase the carbon source addition amount in the non-aeration zone, and then continues step (a);
(2) Aeration control section:
(e) The ammonia nitrogen probe and the DO probe respectively acquire the ammonia nitrogen content and the DO content in the sewage in the aeration zone in real time and then send the ammonia nitrogen content and the DO content to the PLC;
(f) The PLC controller judges whether the ammonia nitrogen content and the DO content are respectively in a set ammonia nitrogen target value range and a set DO target value range;
(g) If the ammonia nitrogen content value is smaller than the ammonia nitrogen target value range and the DO content value is higher than the DO target value range, the PLC controller controls the fan to reduce the output air quantity, and then the step (e) is continued;
(h) If the ammonia nitrogen content value is larger than the ammonia nitrogen target value range and the DO content value is lower than the DO target value range, the PLC controls the fan to increase the output air quantity, and then the step (e) is continued;
(i) If the detected ammonia nitrogen content value still continues to increase and the DO content value still continues to decrease after the output air volume of the fan reaches the maximum, the PLC controller controls the water inlet pump to gradually reduce the water inlet volume, and then the step (e) is continued;
(j) If the detected ammonia nitrogen content value still continues to decrease and the DO content value still continues to increase after the output air quantity of the fan is reduced to the minimum, the PLC controller controls the water inlet pump to gradually increase the water inlet quantity, and then the step (e) is continued; the nitrate nitrogen target value range comprises a lower limit value, a target value and an upper limit value, and when the nitrate nitrogen content value detected by the nitrate nitrogen probe is between the lower limit value and the upper limit value, the adding rate of the carbon source is continuously maintained; the PLC is provided with a carbon source adding amount program comprising the following formula:
N＝C1—C2 (2)
wherein Qm-the amount of the carbon source solution to be added, m 3 /h; cm-concentration of the external carbon source solution added, mg/L; n-nitrogen concentration to be removed by denitrification with an external carbon source, mg/L; 5-denitrification 1kg of nitric acid nitrogen requires additional carbon source quantity, kgCOD/kgNO 3 The method comprises the steps of carrying out a first treatment on the surface of the a-COD value, g/g corresponding to the externally added carbon source; b-proportioning concentration of carbon source solution; q-the amount of treated water, m 3 /h; c1-measured value of nitric acid concentration in biological reaction zone, mg/L; the concentration of nitric acid in the C2-biological reaction zone is controlled to reach a target value, mg/L; and judging the addition amount of the carbon source through the formula.
2. The method for reducing consumption and improving efficiency for biological denitrification of oxidation ditch according to claim 1, wherein the method comprises the following steps: the area ratio of the aeration area to the non-aeration area is 1:3.
3. The method for reducing consumption and improving efficiency for biological denitrification of oxidation ditch according to claim 1, wherein the method comprises the following steps: the aeration device comprises an aeration disc, wherein the aeration disc is connected with the fan, and the fan is in communication connection with the PLC.
4. The method for reducing consumption and improving efficiency for biological denitrification of oxidation ditch according to claim 1, wherein the method comprises the following steps: the carbon source is sodium acetate solution or methanol solution.
5. The method for reducing consumption and improving efficiency for biological denitrification of oxidation ditch according to claim 1, wherein the method comprises the following steps: the PLC comprises an AI module for respectively collecting and judging whether the nitrate nitrogen content, the ORP content, the ammonia nitrogen content and the DO content in the sewage detected by the nitrate nitrogen probe, the ORP probe, the ammonia nitrogen probe and the DO probe are in the corresponding set target value ranges; and the AO module is in communication connection with the AI module and controls the flow of the water inlet pump, the opening of the flow regulating valve and the air quantity of the fan according to the judgment result of the AI module.
6. The method for reducing consumption and improving efficiency for biological denitrification of oxidation ditch according to claim 1, wherein the method comprises the following steps: and a pusher is arranged in the non-aeration area along the flowing direction of the water flow, and is in communication connection with the PLC and controls the switch of the pusher through the PLC.
7. The method for reducing consumption and improving efficiency for biological denitrification of oxidation ditch according to claim 1, wherein the method comprises the following steps: the sewage treatment device is characterized by further comprising a sedimentation tank, the upper end of the sedimentation tank is communicated with the water outlet, a first output pipeline and a second output pipeline are communicated with the bottom end of the sedimentation tank, the first output pipeline is communicated with the non-aeration area through a reflux pump, and the second output pipeline is communicated with the sludge treatment system.
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| CN111039395A (en) * | 2019-12-12 | 2020-04-21 | 广州环投环境服务有限公司 | Accurate aeration control method and system |
| CN112209503B (en) * | 2020-09-15 | 2022-09-23 | 河南同生环境工程有限公司 | Oxidation ditch denitrification control system |
| CN114873847A (en) * | 2022-04-25 | 2022-08-09 | 中国海洋大学 | Method and system for controlling accurate addition of liquid carbon source to constructed wetland |
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