CN113378098B - A 2 Method for calculating denitrification and dephosphorization operation effect of O process - Google Patents
A 2 Method for calculating denitrification and dephosphorization operation effect of O process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 104
- 230000008569 process Effects 0.000 title claims abstract description 82
- 230000000694 effects Effects 0.000 title claims abstract description 29
- 238000005070 sampling Methods 0.000 claims abstract description 214
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 128
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 128
- 239000011574 phosphorus Substances 0.000 claims abstract description 128
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 124
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 62
- 230000005012 migration Effects 0.000 claims abstract description 51
- 238000013508 migration Methods 0.000 claims abstract description 51
- 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 33
- 238000004364 calculation method Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 171
- 238000010992 reflux Methods 0.000 claims description 56
- 239000010802 sludge Substances 0.000 claims description 50
- 238000004062 sedimentation Methods 0.000 claims description 25
- 238000011084 recovery Methods 0.000 claims description 24
- 230000014759 maintenance of location Effects 0.000 claims description 11
- 239000000356 contaminant Substances 0.000 claims description 9
- 239000003344 environmental pollutant Substances 0.000 claims description 6
- 231100000719 pollutant Toxicity 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 5
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000007865 diluting Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
-
- 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
-
- 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
- C02F2101/105—Phosphorus compounds
-
- 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
Abstract
The application discloses A 2 A method for calculating the denitrification and dephosphorization operation effect of an O process. The method may include: determining sampling points according to a process principle and functional area division; calculating the sampling time of each sampling point, and sampling for each sampling point; detecting a sampling result and calculating the concentration of nitrate nitrogen; calculation A 2 Total nitrogen removal rate along the process of the O process and phosphorus mobility of each functional area of the biological pool, and evaluating A 2 The denitrification and dephosphorization operation effect of the biological system of the O process. The invention detects A by tracking 2 And analyzing nitrogen and phosphorus migration rules and removal effects of each functional area on the basis of material balance according to nitrogen and phosphorus indexes along the process of the/O process, evaluating and optimizing the nitrogen and phosphorus removal operation conditions of the sewage treatment plant, and realizing the fine operation of the sewage treatment plant, and improving quality and efficiency.
Description
Technical Field
The invention relates to a sewage treatment plant A 2 The field of evaluation of denitrification and dephosphorization operation effect of the O process, in particular to A 2 A method for calculating the denitrification and dephosphorization operation effect of an O process.
Background
Nitrogen and phosphorus are the main substances that cause eutrophication of water bodies. With the increasing sharpness of water eutrophication problems and the continuous strictness of sewage discharge standards, the denitrification and dephosphorization technology has become a hot spot and a difficult point of current sewage treatment. The upgrading and reconstruction and new construction of urban sewage treatment plants are required to meet the requirements of denitrification and dephosphorization. How to calculate and evaluate the denitrification and dephosphorization operation effect of a sewage treatment plant and put forward reasonable improvement measures to guide the sustainable development of sewage treatment is a great problem facing the sewage treatment industry.
Therefore, it is necessary to develop a based on the actual hydraulic retention time and material balance 2 A method for calculating the denitrification and dephosphorization operation effect of an O process.
The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides A 2 Method for calculating denitrification and dephosphorization operation effect of O process, which can detect A by tracking 2 And analyzing nitrogen and phosphorus migration rules and removal effects of each functional area on the basis of material balance according to nitrogen and phosphorus indexes along the process of the/O process, evaluating and optimizing the nitrogen and phosphorus removal operation conditions of the sewage treatment plant, and realizing the fine operation of the sewage treatment plant, and improving quality and efficiency.
The embodiment of the disclosure provides an A 2 The method for calculating the denitrification and dephosphorization operation effect of the O process comprises the following steps:
determining sampling points according to a process principle and functional area division;
calculating the sampling time of each sampling point, and sampling for each sampling point;
detecting a sampling result and calculating the concentration of nitrate nitrogen;
calculation A 2 Total nitrogen removal rate along the process of the O process and phosphorus mobility of each functional area of the biological pool, and evaluating A 2 The denitrification and dephosphorization operation effect of the biological system of the O process.
Preferably, the sampling points comprise a biological pond water inlet sampling point, an anaerobic zone water outlet sampling point, an anoxic zone water inlet sampling point, an anoxic zone water outlet sampling point, an aerobic zone water inlet sampling point, an aerobic zone water outlet sampling point, a secondary sedimentation water outlet sampling point and an external reflux sludge sampling point.
Preferably, the sampling time of the one-to-one correspondence of the subsequent sampling points to the same sample taken of the water sample is determined based on the actual hydraulic retention time of the biological pond.
Preferably, the sampling time of the anaerobic zone water inlet sampling point, the anaerobic zone water outlet sampling point, the anoxic zone water inlet sampling point, the anoxic zone water outlet sampling point, the aerobic zone water inlet sampling point and the aerobic zone water outlet sampling point is calculated by the formula (1):
wherein T is 1 Sampling time of water inlet sampling point of biological pool, T i Sampling time for the ith sampling point, L i I is the distance from the ith sampling point to the head end of the biological pool, i is 2,7]I=2 represents an anaerobic zone water inflow sampling point, i=3 represents an anaerobic zone water outflow sampling point, i=4 represents an anoxic zone water inflow sampling point, i=5 represents an anoxic zone water outflow sampling point, i=6 represents an aerobic zone water inflow sampling point, i=7 represents an aerobic zone water outflow sampling point, W is the width of the biological pond, H is the effective water depth of the biological pond, Q is the water inflow amount, R is the external reflux ratio, R is the internal reflux ratio, and L is the ratio Anaerobic reactor Length of anaerobic zone, L Lack of supply Length of anoxic zone, L Good (good) Is the length of the aerobic zone.
Preferably, the sampling time of the secondary sedimentation water sampling point and the external reflux sludge sampling point is calculated according to the actual hydraulic retention time of the complete plug-flow reactor:
wherein T is the sampling time of the two precipitated water sampling points and the external reflux sludge sampling point, T 1 Sampling time of water inlet sampling point of biological pond, W is width of biological pond, H is biological pondEffective water depth of the pool, Q is water inflow, R is external reflux ratio, R is internal reflux ratio, L Anaerobic reactor Length of anaerobic zone, L Lack of supply Length of anoxic zone, L Good (good) Length of aerobic zone, V Sinking twice Is the volume of the secondary sedimentation tank.
Preferably, the method further comprises:
and carrying out mud-water separation at the same time of sampling each sampling point or within a time threshold, wherein the time threshold is 15min.
Preferably, if a sludge reflux inlet is arranged in the functional area, the nitrate nitrogen concentration of the head end sampling point of the functional area is obtained by calculating the nitrate nitrogen concentration and the water quantity of each inflow water flow converging to the point;
the nitrate nitrogen concentration of the anaerobic zone feed water was calculated by equation (3):
the nitrate nitrogen concentration of the inlet water of the anoxic zone is calculated by the formula (4):
wherein C is x,y The contaminant concentration at position x, item y, R is the external reflux ratio and R is the internal reflux ratio.
Preferably, A is calculated 2 The total nitrogen removal rate of the O process comprises the following steps:
calculation A 2 Nitrogen content data of each link of the O process and each functional area of the biological pool;
calculating total nitrogen recovery rate, and judging whether the error of the total nitrogen recovery rate is smaller than a set threshold value;
if the error of the total nitrogen recovery rate is smaller than the set threshold value, the total nitrogen removal rate along the process is calculated according to the nitrogen content data.
Preferably, the along-path total nitrogen removal rate is calculated by equation (5):
wherein, gamma TN For nitrogen removal rate, M a,b The total amount of contaminants for item b at location a.
Preferably, A is calculated 2 The phosphorus mobility of each functional area of the biological pool of the O process comprises:
calculation A 2 Calculating the total phosphorus recovery rate and checking the phosphorus content data of each link of the secondary biological treatment system of the O process, and judging whether the phosphorus balance rate of the biological system meets the requirement;
calculating phosphorus migration data of each functional area, including phosphorus migration of an anaerobic area, phosphorus migration of an anoxic area, phosphorus migration of an aerobic area, phosphorus migration of a secondary sedimentation tank and phosphorus migration in a sludge return process;
calculating phosphorus mobility balance rate, and judging whether the error of the phosphorus mobility balance rate is smaller than a set threshold value;
and if the error of the phosphorus mobility balance is smaller than a set threshold value, calculating the mobility of phosphorus in each functional area according to the phosphorus mobility data.
Preferably, the anaerobic zone phosphorus migration amount is calculated by formula (6):
calculating the phosphorus migration amount of the anoxic zone by the formula (7):
calculating the phosphorus migration quantity of the aerobic zone by a formula (8):
calculating the phosphorus migration quantity in the secondary sedimentation tank and sludge backflow process through a formula (9):
calculating the phosphorus mobility balance by the formula (10):
the mobility of phosphorus in each functional region was calculated by formula (11):
wherein mu P For phosphorus mobility, gamma P For phosphorus mobility, M a,b For the total amount of contaminants in item b at position a, R is the external reflux ratio, R is the internal reflux ratio, C x,y The pollutant concentration of the position x and the project y is Q, the water inflow quantity is Q Row of rows And discharging sludge for the residual sludge.
The beneficial effects are that:
sampling in one-to-one correspondence based on actual hydraulic retention time, tracking and detecting A 2 The nitrogen and phosphorus migration rules and the removal effect of each functional area are analyzed on the basis of material balance along the nitrogen and phosphorus indexes of the O process, so that the method is an effective method for evaluating and optimizing the nitrogen and phosphorus removal operation conditions of the sewage treatment plant, and is particularly important for implementing refined operation of the sewage treatment plant and realizing quality improvement and efficiency improvement.
The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the present invention.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
FIG. 1 shows A in accordance with one embodiment of the invention 2 Schematic of the/O sample point setup.
FIG. 2 shows A in accordance with one embodiment of the invention 2 And (3) a flow chart of the step of the denitrification and dephosphorization operation effect calculation method of the O process.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
The invention provides A 2 The method for calculating the denitrification and dephosphorization operation effect of the O process comprises the following steps:
determining sampling points according to a process principle and functional area division; in one example, the sampling points include a biological pond water inlet sampling point, an anaerobic zone water outlet sampling point, an anoxic zone water inlet sampling point, an anoxic zone water outlet sampling point, an aerobic zone water inlet sampling point, an aerobic zone water outlet sampling point, a secondary sedimentation water outlet sampling point, and an external reflux sludge sampling point.
Specifically, the sampling point is set at A 2 Head end and tail end of each functional area of the biological pool of the/O technology. If the functional area is internally provided with a sludge backflow inlet, the sampling point at the head end of the functional area is arranged at the position where the sludge backflow inlet is uniformly mixed.
FIG. 1 shows A in accordance with one embodiment of the invention 2 Schematic of the/O sample point setup.
A 2 the/O process sampling points are shown in fig. 1. The number of sampling points is 9, namely (1) biological pond water inflow, (2) anaerobic zone water inflow (after external reflux), (3) anaerobic zone water outflow, (4) anoxic zone water inflow (after internal reflux), (5) anoxic zone water outflow, (6) aerobic zone water inflow, (7) aerobic zone water outflow, (8) secondary sedimentation water and (9) external reflux sludge. Wherein the distance between the water inlet (after external reflux) of the anaerobic zone of the sampling point (2) and the head end of the biological pond is L 2 The distance between the water outlet of the anaerobic zone of the sampling point (3) and the head end of the biological pond is L 3 Sampling point(4) The distance between the water inlet (after internal reflux) of the anoxic zone and the head end of the biological pond is L 4 The distance between the effluent of the anoxic zone of the sampling point (5) and the head end of the biological pond is L 5 The distance between the water inlet of the aerobic zone of the sampling point (6) and the head end of the biological pond is L 6 The distance between the outlet water of the aerobic zone of the sampling point (7) and the head end of the biological pond is L 7 。
Calculating the sampling time of each sampling point, and sampling for each sampling point; in one example, based on the actual hydraulic retention time of the biological pond, a one-to-one sampling time is determined for the subsequent sampling point to be the same sample as the taken water sample.
In one example, the sampling time of the anaerobic zone water inlet sampling point, the anaerobic zone water outlet sampling point, the anoxic zone water inlet sampling point, the anoxic zone water outlet sampling point, the aerobic zone water inlet sampling point, and the aerobic zone water outlet sampling point is calculated by the formula (1):
wherein T is 1 Sampling time of water inlet sampling point of biological pool, T i Sampling time for the ith sampling point, L i I is the distance from the ith sampling point to the head end of the biological pool, i is 2,7]I=2 represents an anaerobic zone water inflow sampling point, i=3 represents an anaerobic zone water outflow sampling point, i=4 represents an anoxic zone water inflow sampling point, i=5 represents an anoxic zone water outflow sampling point, i=6 represents an aerobic zone water inflow sampling point, i=7 represents an aerobic zone water outflow sampling point, W is the width of the biological pond, H is the effective water depth of the biological pond, Q is the water inflow amount, R is the external reflux ratio, R is the internal reflux ratio, and L is the ratio Anaerobic reactor Length of anaerobic zone, L Lack of supply Length of anoxic zone, L Good (good) Is the length of the aerobic zone.
In one example, the sampling times of the secondary submerged sampling point and the external return sludge sampling point are calculated from the actual hydraulic residence time of the complete plug flow reactor:
wherein T is the sampling time of the two precipitated water sampling points and the external reflux sludge sampling point, T 1 The sampling time of the water inlet sampling point of the biological pond is W is the width of the biological pond, H is the effective water depth of the biological pond, Q is the water inlet amount, R is the external reflux ratio, R is the internal reflux ratio and L Anaerobic reactor Length of anaerobic zone, L Lack of supply Length of anoxic zone, L Good (good) Length of aerobic zone, V Sinking twice Is the volume of the secondary sedimentation tank.
Specifically, based on the actual hydraulic retention time of the biological pond, the sampling time of the one-to-one correspondence of the subsequent sampling points and the taken water sample to the same sample is determined. I.e., in an ideal plug-flow reactor, the sampling time interval between the ith sampling point and the 1 st sampling point is exactly the time when the inlet water sample flows from the 1 st sampling point to the ith sampling point. Therefore, all sampling points and the taken water sample are ensured to be the same sample under different time, and errors caused by fluctuation of water quality of the water are avoided.
The water inlet of the biological pool at the sampling point (1) is a water inlet sample, and the sampling time is T 1 . The sampling time from the anaerobic zone water inlet (after external reflux) to the aerobic zone water outlet (7) of the sampling point (2) is calculated according to the actual hydraulic retention time of the complete plug-flow reactor, namely by the formula (1). The sampling time of secondary sedimentation water at the sampling point (8) and the sampling time of external reflux sludge at the sampling point (9) are calculated according to the actual hydraulic retention time of the complete plug flow type reactor, and the sampling time of the two sampling points is consistent and is T, and the calculation is carried out through the formula (2).
In one example, further comprising: and carrying out mud-water separation at the same time of sampling each sampling point or within a time threshold, wherein the time threshold is 15min.
Specifically, an effective sampling method and a sample disposal mode are adopted. And (3) normally sampling the inflow water of the biological pool at the sampling point (1) and the secondary sedimentation water at the sampling point (8) according to the national standard. The anaerobic zone water inlet (after external reflux) of the sampling point (2), the anaerobic zone water outlet of the sampling point (3), the anoxic zone water inlet (after internal reflux) of the sampling point (4), the anoxic zone water outlet of the sampling point (5), the aerobic zone water inlet of the sampling point (6) and the aerobic zone water outlet of the sampling point (7) are provided with a suction filtration deviceThe sampler of (2) samples, and only the clear liquid is collected after the activated sludge is discarded. If the sample collected by the suction filtration device is a mud-water mixture, in order to avoid continuous reaction of the activated sludge and the water sample, mud-water separation should be completed within 15min, and the mud-water separation mode can be in-situ sedimentation to obtain supernatant or centrifugation to obtain supernatant. Collecting 2 bottles of samples from the sludge at the outer reflux of the sampling point (9), collecting 1 bottle of clear liquid according to the method, discarding the activated sludge, and adding H after 1 bottle of normal sampling according to the national standard 2 SO 4 The pH value is regulated to be less than or equal to 2.
Detecting a sampling result, and calculating nitrate nitrogen concentration of water entering an anaerobic zone and water entering an anoxic zone; in one example, if there is a sludge return inlet in the functional area, the nitrate nitrogen concentration at the head end sampling point of the functional area is obtained by calculating the nitrate nitrogen concentration and the water quantity of each incoming water flow converging at the point;
the nitrate nitrogen concentration of the anaerobic zone feed water was calculated by equation (3):
the nitrate nitrogen concentration of the inlet water of the anoxic zone is calculated by the formula (4):
wherein C is x,y The contaminant concentration at position x, item y, R is the external reflux ratio and R is the internal reflux ratio.
Specifically, a suitable detection method is selected to detect the sampling result. And (3) after sampling the external reflux sludge at the sampling point (9) according to the national standard, adjusting the pH value to be less than or equal to 2, diluting the muddy water mixed sample to a proper concentration, and detecting the total nitrogen and total phosphorus items of the muddy water mixture according to the alkaline potassium persulfate digestion ultraviolet spectrophotometry (HJ 636-2012) for determination of total nitrogen of water quality and the ammonium molybdate spectrophotometry (GB 11893-89) for determination of total phosphorus of water quality, instead of the total nitrogen and total phosphorus items of solid sludge according to the sludge detection method in the sludge detection method (CJ/T221-2005) of urban sewage treatment plants. The rest samples are detected according to the national standard detection method.
And (5) carrying out subsequent calculation by using a reasonable detection result. The rapid denitrification reaction of the easily degradable carbon source in the inlet water and the returned nitrate nitrogen brought by the return sludge can lead to that the nitrate nitrogen concentration detection value of the taken sample is smaller than the actual nitrate nitrogen concentration of the sampling point. If the functional area is provided with a sludge backflow inlet, the nitrate nitrogen concentration of the head end sampling point of the functional area is calculated by the nitrate nitrogen concentration and the water quantity of each inflow water flow converging at the point, and the sample detection value is not used. Namely, the nitrate nitrogen concentration of the inflow water (after external reflux) in the anaerobic zone is shown as a formula (3), and the nitrate nitrogen concentration of the inflow water (after internal reflux) in the anoxic zone is shown as a formula (4).
Calculation A 2 Total nitrogen removal rate along the process of the O process and phosphorus mobility of each functional area of the biological pool, and evaluating A 2 The denitrification and dephosphorization operation effect of the biological system of the O process; in one example, calculate A 2 The total nitrogen removal rate of the O process comprises the following steps:
calculation A 2 Nitrogen content data of each link of the O process and each functional area of the biological pool;
calculating the total nitrogen recovery rate, and judging whether the error of the total nitrogen recovery rate is smaller than a set threshold value;
if the error of the total nitrogen recovery rate is smaller than the set threshold value, the total nitrogen removal rate along the process is calculated according to the nitrogen content data.
In one example, the along-path total nitrogen removal rate is calculated by equation (5):
wherein, gamma TN For nitrogen removal rate, M a,b The total amount of contaminants for item b at location a.
Specifically, calculate A 2 The nitrogen content of each link and each functional area of the biological pool of the secondary biological treatment system of the O process comprises:
the total nitrogen content of the inlet water is as follows:
the total nitrogen content of the secondary sedimentation water is as follows:
the nitrogen content of the residual sludge is as follows:
the nitrogen content removed by denitrification in the anaerobic zone is as follows:
the nitrogen content removed by denitrification in the anoxic zone is as follows:
the nitrogen content removed in the aerobic zone is as follows:
the nitrogen content removed by denitrification of the secondary sedimentation tank and the external reflux sludge is as follows:
wherein Q is Row of rows M is the sludge discharge amount of the excess sludge 3 。
According to the principle of material balance, A is calculated by a formula (19) 2 Total nitrogen recovery of biological system of O process:
wherein eta TN For total nitrogen recovery, M a,b Judging whether the error of the total nitrogen recovery rate is smaller than a set threshold value for the total pollutant amount of the item b of the position a; if the error of the total nitrogen recovery is smaller than the set threshold, i.e. |eta TN -1|≤z 1 And calculating the total nitrogen removal rate along the process according to the nitrogen content data by using a formula (5).
In one example, calculate A 2 The phosphorus mobility of each functional area of the biological pool of the O process comprises:
calculation A 2 Calculating the total phosphorus recovery rate and checking the phosphorus content data of each link of the secondary biological treatment system of the O process, and judging whether the phosphorus balance rate of the biological system meets the requirement;
calculating phosphorus migration data of each functional area, including phosphorus migration of an anaerobic area, phosphorus migration of an anoxic area, phosphorus migration of an aerobic area, phosphorus migration of a secondary sedimentation tank and phosphorus migration in a sludge return process;
calculating phosphorus mobility balance rate, and judging whether the error of the phosphorus mobility balance rate is smaller than a set threshold value;
if the error of the phosphorus mobility balance is smaller than the set threshold value, calculating the mobility of the phosphorus in each functional area according to the phosphorus mobility data.
In one example, anaerobic zone phosphorus migration amount is calculated by equation (6):
calculating the phosphorus migration quantity of the anoxic zone according to the formula (7):
calculating the phosphorus migration quantity of the aerobic zone by the formula (8):
calculating the phosphorus migration quantity in the secondary sedimentation tank and sludge backflow process through a formula (9):
phosphorus mobility balance was calculated by equation (10):
the mobility of phosphorus in each functional region was calculated by formula (11):
wherein mu P For phosphorus mobility, gamma P For phosphorus mobility, M a,b For the total amount of contaminants in item b at position a, R is the external reflux ratio, R is the internal reflux ratio, C x,y The pollutant concentration of the position x and the project y is Q, the water inflow quantity is Q Row of rows And discharging sludge for the residual sludge.
Specifically, calculate A 2 The phosphorus content of each link of the secondary biological treatment system of the O process comprises:
the total phosphorus content of the inlet water is as follows:
the total phosphorus content of the effluent is as follows:
the phosphorus content of the residual sludge is as follows:
according to material balancePrinciple, calculate A 2 The total phosphorus recovery rate of the secondary biological treatment system of the O process is as follows:
wherein eta TP Judging whether the error of the total phosphorus recovery rate is smaller than a set threshold value for the total phosphorus recovery rate; if the error of the total phosphorus recovery rate is smaller than the set threshold, i.e. |eta TP -1|≤z 2 The phosphorus balance rate of the biological system meets the requirement.
Since phosphorus migrates only in the liquid and solid phases, A is calculated 2 The phosphorus migration amount of each functional area of the biological pool of the O process comprises:
the migration amount of phosphorus in the anaerobic zone is shown in formula (6), the migration amount of phosphorus in the anoxic zone is shown in formula (7), the migration amount of phosphorus in the aerobic zone is shown in formula (8), and the migration amount of phosphorus in the secondary sedimentation tank and the sludge return process is shown in formula (9). The positive values of the calculations in equations (6) - (9) indicate phosphorus migration from the liquid phase to the solid phase, and the negative values indicate phosphorus migration from the solid phase to the liquid phase.
According to the material balance principle, calculate A 2 The phosphorus mobility balance rate of the biological system of the O process is shown as a formula (10), and whether the error of the phosphorus mobility balance rate is smaller than a set threshold value is judged; if the error in phosphorus mobility is less than the set threshold, i.e. |mu P -1|≤z 3 And (3) according to the phosphorus migration data, calculating the migration rate of the phosphorus in each functional area through a formula (11) to check the phosphorus migration balance.
In order to facilitate understanding of the solution and the effects of the embodiments of the present invention, three specific application examples are given below. It will be understood by those of ordinary skill in the art that the examples are for ease of understanding only and that any particular details thereof are not intended to limit the present invention in any way.
Example 1
FIG. 2 shows A in accordance with one embodiment of the invention 2 And (3) a flow chart of the step of the denitrification and dephosphorization operation effect calculation method of the O process.
As shown in FIG. 2, the A 2 Denitrification and dephosphorization operation effect of O processThe calculation method comprises the following steps: step 101, determining sampling points according to a process principle and functional area division; 102, calculating the sampling time of each sampling point, and sampling for each sampling point; step 103, detecting a sampling result and calculating the concentration of nitrate nitrogen; step 104, calculate A 2 Total nitrogen removal rate along the process of the O process and phosphorus mobility of each functional area of the biological pool, and evaluating A 2 The denitrification and dephosphorization operation effect of the biological system of the O process.
Select a certain A 2 The sampling points of the sewage treatment plant of the O process are set according to the figure 1, and the inflow of the water plant, the parameters of the structures of the secondary biological treatment system and the operation parameters are shown in the table 1.
TABLE 1
Setting the water inflow sampling time of the biological pool of the sampling point (1) to be 0:00, calculating the sampling time of the subsequent sampling points corresponding to the water inflow of the biological pool of the sampling point (1) one by one according to the actual hydraulic retention time principle, the formula (1) and the formula (2), wherein the distance between the subsequent sampling points and the head end of the biological pool and the calculation result of the sampling time are shown in a table 2.
TABLE 2
| Sequence number | Sampling point location | Distance m from the head end of biological pond | Sampling time |
| ① | Water inlet of biological pool | 0 | 0:00 |
| ② | Anaerobic zone water inlet (after external reflux) | 7 | 0:06 |
| ③ | Anaerobic zone effluent | 55 | 0:50 |
| ④ | Anoxic zone water inlet (internal reflux) | 65 | 0:55 |
| ⑤ | Effluent from anoxic zone | 202 | 1:43 |
| ⑥ | Water inlet in aerobic zone | 203 | 1:44 |
| ⑦ | Effluent from aerobic zone | 550 | 3:45 |
| ⑧ | Secondary sedimentation water | / | 8:53 |
| ⑨ | External reflux sludge | / | 8:53 |
Because the anaerobic zone water inlet (after external reflux) of the sampling point (2) and the anoxic zone water inlet (after internal reflux) of the sampling point (4) are both provided with sludge reflux, the nitrate nitrogen rapid denitrification reaction carried back by the easily degradable carbon source and the returned sludge in the water can lead to the nitrate nitrogen concentration detection values of the two sampling points to be smaller than the nitrate nitrogen actual concentration. The nitrate nitrogen concentration at these two sampling points should be calculated from the nitrate nitrogen concentration and the water quantity of each incoming water stream that merges into this point. The nitrate nitrogen concentration and the water amount of the inflow water flow of the anaerobic zone water inlet (after external reflux) of the sampling point (2) and the anoxic zone water inlet (after internal reflux) of the sampling point (4) are shown in table 3, and according to formulas (3) to (4), the nitrate nitrogen concentration of the anaerobic zone is calculated to be 3.69mg/L, and the nitrate nitrogen concentration of the anoxic zone is calculated to be 4.76mg/L.
TABLE 3 Table 3
| Nitrate nitrogen mg/L | |||
| Water inlet of biological pool | 0.726 | External reflux ratio | 0.94 |
| Anaerobic zone effluent | 0.164 | Internal reflux ratio | 1.61 |
| Effluent from aerobic zone | 10.3 | ||
| External reflux sludge clear liquid | 6.85 |
Example 2
Select a certain A 2 The sampling points of the sewage treatment plant of the O process are set according to the figure 1, and the pollutant concentration of each sampling point and the operation parameters of the sewage treatment plant are shown in the table 4.
TABLE 4 Table 4
Calculating A according to formulas (12) - (18) 2 The nitrogen content of each link of the secondary biological treatment system and each functional area of the biological pond in the O process is shown in the second column of Table 5. The total nitrogen recovery was calculated to be 105.6% according to equation (19). Setting the error threshold value as 10%, checking the total nitrogen recovery rate, and ensuring that the nitrogen balance rate of the biological system meets the requirement. Then calculate A according to equation (5) 2 Each link of the secondary biological treatment system and each functional area of the biological pool in the O processNitrogen removal and results are shown in the third column of table 5.
TABLE 5
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Example 3
Select a certain A 2 The sampling points of the sewage treatment plant of the O process are set according to the figure 1, and the pollutant concentration of each sampling point and the operation parameters of the sewage treatment plant are shown in the table 6.
TABLE 6
Calculating A according to formulas (20) - (22) 2 The phosphorus content of each link of the secondary biological treatment system of the O process is shown in Table 7. The total phosphorus recovery was calculated to be 92.0% according to equation (23). Setting the error threshold as 10%, checking the total phosphorus recovery rate, and ensuring that the phosphorus balance rate of the biological system meets the requirement.
TABLE 7
| Phosphorus content kg | |
| Total phosphorus content of the feed water | 216 |
| Total phosphorus content of secondary sedimentation water | 3 |
| Phosphorus content of excess sludge | 196 |
| Totalizing | 199 |
Calculation of A according to formulas (6) - (9) 2 Phosphorus migration amount of each functional area of the biological pool of the O process, and the result is shown in the second column of Table 8. Calculate A according to equation (10) 2 The phosphorus mobility balance of the biological system of the O process is 104%. And setting the error threshold value as 10%, and checking the phosphorus migration balance rate to know that the phosphorus migration balance rate meets the requirement. Then calculate A according to equation (11) 2 The mobility of phosphorus in each functional region of the biological pond of the O process is shown in the third column of Table 8.
TABLE 8
| Phosphorus migration amount kg | Mobility of | |
| Migration of phosphorus in anaerobic zone | -55 | -38％ |
| Migration of phosphorus in anoxic zones | 171 | 120％ |
| Migration of phosphorus in aerobic zone | 22 | 16％ |
| Migration of phosphorus in secondary sedimentation tank and return sludge process | 3 | 2.5％ |
| Amount of water inlet SP | 138 | |
| Amount of secondary sedimentation water SP | 1.8 |
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention has been given for the purpose of illustrating the benefits of embodiments of the invention only and is not intended to limit embodiments of the invention to any examples given.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (7)
1. A, A 2 The method for calculating the denitrification and dephosphorization operation effect of the O process is characterized by comprising the following steps of:
determining sampling points according to a process principle and functional area division;
calculating the sampling time of each sampling point, and sampling for each sampling point;
detecting a sampling result and calculating the concentration of nitrate nitrogen;
calculation A 2 Total nitrogen removal rate along the process of the O process and phosphorus mobility of each functional area of the biological pool, and evaluating A 2 The denitrification and dephosphorization operation effect of the biological system of the O process;
the sampling points comprise a biological pond water inlet sampling point, an anaerobic zone water outlet sampling point, an anoxic zone water inlet sampling point, an anoxic zone water outlet sampling point, an aerobic zone water inlet sampling point, an aerobic zone water outlet sampling point, a secondary sedimentation water outlet sampling point and an external reflux sludge sampling point;
determining sampling time corresponding to the follow-up sampling points and the water inlet samples in one-to-one mode based on the actual hydraulic retention time of the biological pond;
the anaerobic zone water inlet sampling point, the anaerobic zone water outlet sampling point, the anoxic zone water inlet sampling point, the anoxic zone water outlet sampling point, the aerobic zone water inlet sampling point and the aerobic zone water outlet sampling point sampling time are calculated according to the formula (1):
wherein T is 1 Sampling time of water inlet sampling point of biological pool, T i Sampling time for the ith sampling point, L i I is the distance from the ith sampling point to the head end of the biological pool, i is 2,7]I=2 represents an anaerobic zone water inflow sampling point, i=3 represents an anaerobic zone water outflow sampling point, i=4 represents an anoxic zone water inflow sampling point, i=5 represents an anoxic zone water outflow sampling point, i=6 represents an aerobic zone water inflow sampling point, i=7 represents an aerobic zone water outflow sampling point, W is the width of the biological pond, H is the effective water depth of the biological pond, Q is the water inflow amount, R is the external reflux ratio, R is the internal reflux ratio, and L is the ratio Anaerobic reactor Length of anaerobic zone, L Lack of supply Length of anoxic zone, L Good (good) Is the length of the aerobic zone;
calculating the sampling time of the secondary sedimentation water sampling point and the external reflux sludge sampling point according to the actual hydraulic retention time of the complete plug flow reactor:
wherein T is the sampling time of the two precipitated water sampling points and the external reflux sludge sampling point, V Sinking twice Is the volume of the secondary sedimentation tank.
2. A according to claim 1 2 The method for calculating the denitrification and dephosphorization operation effect of the O process further comprises the following steps:
and carrying out mud-water separation at the same time of sampling each sampling point or within a time threshold, wherein the time threshold is 15min.
3. A according to claim 1 2 The method for calculating the denitrification and dephosphorization operation effect of the O process comprises the steps that if a sludge backflow inlet is arranged in a functional area, the nitrate nitrogen concentration of a sampling point at the head end of the functional area is obtained by calculating the nitrate nitrogen concentration and the water quantity of each inflow water flow converging to the point;
the nitrate nitrogen concentration of the anaerobic zone feed water was calculated by equation (3):
the nitrate nitrogen concentration of the inlet water of the anoxic zone is calculated by the formula (4):
wherein C is x,y The contaminant concentration at position x, item y, R is the external reflux ratio and R is the internal reflux ratio.
4. A according to claim 1 2 Method for calculating denitrification and dephosphorization operation effect of O process, wherein A is calculated 2 The total nitrogen removal rate of the O process comprises the following steps:
calculation A 2 Links of the O process and biological poolsNitrogen content data of the functional region;
calculating total nitrogen recovery rate, and judging whether the error of the total nitrogen recovery rate is smaller than a set threshold value;
if the error of the total nitrogen recovery rate is smaller than the set threshold value, the total nitrogen removal rate along the process is calculated according to the nitrogen content data.
5. A according to claim 4 2 The method for calculating the denitrification and dephosphorization operation effect of the O process comprises the following steps of calculating the total nitrogen removal rate through a formula (5):
wherein, gamma TN For nitrogen removal rate, M a,b The total amount of contaminants for item b at location a.
6. A according to claim 1 2 Method for calculating denitrification and dephosphorization operation effect of O process, wherein A is calculated 2 The phosphorus mobility of each functional area of the biological pool of the O process comprises:
calculation A 2 Calculating the total phosphorus recovery rate and checking the phosphorus content data of each link of the secondary biological treatment system of the O process, and judging whether the phosphorus balance rate of the biological system meets the requirement;
calculating phosphorus migration data of each functional area, including phosphorus migration of an anaerobic area, phosphorus migration of an anoxic area, phosphorus migration of an aerobic area, phosphorus migration of a secondary sedimentation tank and phosphorus migration in a sludge return process;
calculating phosphorus mobility balance rate, and judging whether the error of the phosphorus mobility balance rate is smaller than a set threshold value;
and if the error of the phosphorus mobility balance is smaller than a set threshold value, calculating the mobility of phosphorus in each functional area according to the phosphorus mobility data.
7. A according to claim 6 2 The method for calculating the denitrification and dephosphorization operation effect of the O process comprises the following steps of calculating the phosphorus migration quantity of the anaerobic zone through a formula (6):
calculating the phosphorus migration amount of the anoxic zone by the formula (7):
calculating the phosphorus migration quantity of the aerobic zone by a formula (8):
calculating the phosphorus migration quantity in the secondary sedimentation tank and sludge backflow process through a formula (9):
calculating the phosphorus mobility balance by the formula (10):
the mobility of phosphorus in each functional region was calculated by formula (11):
wherein mu P For phosphorus mobility, gamma P For phosphorus mobility, M a,b For the total amount of contaminants in item b at position a, R is the external reflux ratio, R is the internal reflux ratio, C x,y The pollutant concentration of the position x and the project y is Q, the water inflow quantity is Q Row of rows And discharging sludge for the residual sludge.
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