CN113378098A - A2Method for calculating nitrogen and phosphorus removal operation effect of/O process - Google Patents
A2Method for calculating nitrogen and phosphorus removal operation effect of/O process Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 193
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 161
- 239000011574 phosphorus Substances 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 107
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 98
- 230000008569 process Effects 0.000 title claims abstract description 75
- 230000000694 effects Effects 0.000 title claims abstract description 32
- 238000005070 sampling Methods 0.000 claims abstract description 206
- 238000013508 migration Methods 0.000 claims abstract description 70
- 230000005012 migration Effects 0.000 claims abstract description 70
- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 238000011156 evaluation Methods 0.000 claims abstract description 6
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 158
- 238000010992 reflux Methods 0.000 claims description 49
- 239000010802 sludge Substances 0.000 claims description 49
- 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 description 29
- 238000011084 recovery Methods 0.000 claims description 24
- 238000004062 sedimentation Methods 0.000 claims description 24
- 230000014759 maintenance of location Effects 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000000356 contaminant Substances 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 238000011109 contamination Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 239000010865 sewage Substances 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 abstract description 4
- 230000037230 mobility Effects 0.000 description 14
- 238000001514 detection method Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 231100000719 pollutant Toxicity 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
- 238000010586 diagram Methods 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 238000007689 inspection 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
- 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 description 1
- 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
- 238000004458 analytical method Methods 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
- 230000029087 digestion Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process 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
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C02F2101/105—Phosphorus compounds
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Abstract
The application discloses a2A method for calculating the nitrogen and phosphorus removal operation effect of the/O process. The method can comprise 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 nitrogen concentration of the nitrate; calculation of A2Evaluation of Total Nitrogen removal in the course of the/O Process and phosphorus migration in the functional regions of the biological cell2The nitrogen and phosphorus removal operation effect of the/O process biological system. The invention detects A by tracking2the/O process analyzes the nitrogen and phosphorus migration rule and the removal effect of each functional zone on the basis of material balance along with the nitrogen and phosphorus indexes, evaluates and optimizes the nitrogen and phosphorus removal operation condition of the sewage treatment plant, and realizes the refined operation, quality improvement and synergy of the sewage treatment plant.
Description
Technical Field
The invention relates to a sewage treatment plant A2The field of evaluation of nitrogen and phosphorus removal operation effect of the/O process, and more particularly relates to a method A2A method for calculating the nitrogen and phosphorus removal operation effect of the/O process.
Background
Nitrogen and phosphorus are the main substances causing eutrophication of water bodies. With the increasing sharpness of water eutrophication problems and the continuous strictness of sewage discharge standards, nitrogen and phosphorus removal technologies have become hot spots and difficulties in current sewage treatment. The upgrading and reconstruction and the new construction of the urban sewage treatment plant both need to meet the requirements of nitrogen and phosphorus removal. How to calculate and evaluate the nitrogen and phosphorus removal operation effect of a sewage treatment plant and provide reasonable improvement measures to guide the sustainable development of sewage treatment is a major problem in the sewage treatment industry.
Therefore, it is necessary to develop a method A based on actual hydraulic retention time and material balance2A method for calculating the nitrogen and phosphorus removal operation effect of the/O process.
The information disclosed in this background section 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 a2A/O process nitrogen and phosphorus removal operation effect calculation method capable of detecting A through tracking2The method has the advantages that the on-way nitrogen and phosphorus indexes of the/O process are analyzed on the basis of material balance, the nitrogen and phosphorus migration rule and the removal effect of each functional area are analyzed, the nitrogen and phosphorus removal operation condition of the sewage treatment plant is evaluated and optimized, and the fine nitrogen and phosphorus removal operation condition of the sewage treatment plant is realizedThe operation is simplified, the quality is improved and the efficiency is increased.
The disclosed embodiment provides a2The method for calculating the nitrogen and phosphorus removal 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 nitrogen concentration of the nitrate;
calculation of A2Evaluation of Total Nitrogen removal in the course of the/O Process and phosphorus migration in the functional regions of the biological cell2The nitrogen and phosphorus removal operation effect of the/O process biological system.
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 sampling point and an external return sludge sampling point.
Preferably, based on the actual hydraulic retention time of the biological pond, the sampling time of the subsequent sampling point corresponding to the same sample as the taken water sample is determined.
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 formula (1):
wherein, T1Sampling time, T, of a sampling point for the intake of a biological tankiIs the sampling time of the ith sample point, LiThe distance from the ith sampling point to the head end of the biological pool, i belongs to [2,7 ]]When i is 2, the sampling point of the anaerobic zone water inlet is shown, when i is 3, the sampling point of the anaerobic zone water outlet is shown, when i is 4, the sampling point of the anoxic zone water inlet is shown, when i is 5, the sampling point of the anoxic zone water outlet is shown, when i is 6, the sampling point of the aerobic zone water inlet is shown, and when i is 7, the table is shownShowing the sampling point of the effluent of the aerobic zone, W the width of the biological pond, H the effective depth of the biological pond, Q the inflow, R the external reflux ratio, R the internal reflux ratio and LAnaerobic typeFor the length of the anaerobic zone, LLack ofIs the length of the anoxic zone, LGood tasteIs 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 type reactor:
wherein T is the sampling time of the sampling point of secondary sedimentation water and the sampling point of external reflux sludge, T1The sampling time of the biological pond water inlet sampling point 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 LAnaerobic typeFor the length of the anaerobic zone, LLack ofIs the length of the anoxic zone, LGood tasteIs the length of the aerobic zone, VTwo sinksThe volume of the secondary sedimentation tank.
Preferably, the method further comprises the following steps:
and carrying out mud-water separation while sampling each sampling point or within a time threshold, wherein the time threshold is 15 min.
Preferably, if a sludge backflow inlet is arranged in the functional area, the nitrate nitrogen concentration of the sampling point at the head end of the functional area is obtained by calculating the nitrate nitrogen concentration and the water amount of each afflux water flow converged at the point;
calculating the nitrate nitrogen concentration of the anaerobic zone feed water by equation (3):
calculating the nitrate nitrogen concentration of the anoxic zone feed water by equation (4):
wherein, Cx,yThe contaminant concentration at position x item y, R is the external reflux ratio, and R is the internal reflux ratio.
Preferably, A is calculated2The total nitrogen removal in the course of the/O process comprises:
calculation of A2Nitrogen content data of each link of the/O process and each functional area of the biological pond;
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 a set threshold value, calculating the in-process total nitrogen removal rate according to nitrogen content data.
Preferably, the in-situ total nitrogen removal is calculated by equation (5):
wherein, γTNFor nitrogen removal, Ma,bThe total amount of contamination for item b at location a.
Preferably, A is calculated2The phosphorus mobility of each functional area of the/O process biological pool comprises the following steps:
calculation of A2The phosphorus content data of each link of the second-level biological treatment system of the O process is calculated, the total phosphorus recovery rate is checked, and whether the phosphorus balance rate of the biological system meets the requirement or not is judged;
calculating phosphorus migration volume data of each functional zone, wherein the phosphorus migration volume data comprises phosphorus migration volume of an anaerobic zone, phosphorus migration volume of an anoxic zone, phosphorus migration volume of an aerobic zone, phosphorus migration volume of a secondary sedimentation tank and phosphorus migration volume of a sludge backflow process;
calculating the phosphorus migration equilibrium rate, and judging whether the error of the phosphorus migration equilibrium rate is smaller than a set threshold value or not;
and if the error of the phosphorus migration equilibrium rate is smaller than a set threshold value, calculating the phosphorus migration rate of each functional area according to the phosphorus migration volume data.
Preferably, the phosphorus migration amount of the anaerobic zone is calculated by the formula (6):
calculating the phosphorus migration amount of the anoxic zone by a formula (7):
calculating the phosphorus migration amount of the aerobic zone by a formula (8):
calculating the phosphorus migration amount in the secondary sedimentation tank and the return sludge process by a formula (9):
the phosphorus mobility equilibrium is calculated by equation (10):
the mobility of phosphorus in each functional region was calculated by the formula (11):
wherein, muPIs equilibrium rate of phosphorus mobility, gammaPIs phosphorus mobility, Ma,bTotal amount of contaminants in item b at position a, R is external reflux ratio, R is internal reflux ratio, Cx,yIs the concentration of the contaminant at position x item y, Q is the amount of inlet water, QRow boardThe sludge discharge amount of the residual sludge is obtained.
The beneficial effects are that:
based on actual hydraulic retention time, sampling in one-to-one correspondence, tracking and detecting A2The O process is based on material balanceThe analysis of the migration rule and the removal effect of nitrogen and phosphorus in each functional area is an effective method for evaluating and optimizing the nitrogen and phosphorus removal operation condition of the sewage treatment plant, and the fine operation of the sewage treatment plant is implemented, so that the quality improvement and the efficiency improvement are particularly important.
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 invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
FIG. 1 shows A according to an embodiment of the invention2Schematic diagram of/O sample point setup.
FIG. 2 shows A according to an embodiment of the invention2A flow chart of steps of a method for calculating the nitrogen and phosphorus removal operation effect of the/O process.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein.
The invention provides a2The method for calculating the nitrogen and phosphorus removal 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 sampling point, and an external return sludge sampling point.
In particular toGround, the sampling point is set at A2The head end and the tail end of each functional area of the/O process biological pool. If a sludge return inlet is arranged in the functional area, the sampling point at the head end of the functional area is arranged at the position of the sludge return inlet where the sludge is uniformly mixed.
FIG. 1 shows A according to an embodiment of the invention2Schematic diagram of/O sample point setup.
A2the/O process sampling points are shown in FIG. 1. 9 sampling points are arranged, namely, water is fed into the biological pond, water is fed into the anaerobic area (after external reflux), water is discharged from the anaerobic area, water is fed into the anoxic area (after internal reflux), water is discharged from the anoxic area, water is fed into the aerobic area, water is discharged from the aerobic area, water is precipitated and discharged, and the mud is refluxed outside. Wherein the distance between a sampling point and the head end of the biological pond is L2The distance between the sampling point and the head end of the biological pond is L3The distance between the sampling point L and the head end of the biological pond of the inlet water (after internal reflux) of the anoxic zone4The distance between the effluent of the anoxic zone and the head end of the biological pond is L5The distance between the sampling point L and the head end of the biological tank6The distance between the sampling point and the head end of the biological tank is L7。
Calculating the sampling time of each sampling point, and sampling for each sampling point; in one example, a one-to-one correspondence sampling time for a subsequent sampling point to be the same sample as the taken influent sample is determined based on the actual hydraulic retention time of the biological basin.
In one example, the sampling times 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 are calculated by formula (1):
wherein, T1Sampling time, T, of a sampling point for the intake of a biological tankiIs the sampling time of the ith sample point, LiFor the distance from the ith sampling point to the head end of the biological poolI ∈ [2,7 ]]When i is 2, the sampling point of anaerobic zone water inlet is shown, when i is 3, the sampling point of anaerobic zone water outlet is shown, when i is 4, the sampling point of anoxic zone water inlet is shown, when i is 5, the sampling point of anoxic zone water outlet is shown, when i is 6, the sampling point of aerobic zone water inlet is shown, when i is 7, the sampling point of aerobic zone water outlet is shown, W is the width of the biological pond, H is the effective depth of the biological pond, Q is the water inlet amount, R is the external reflux ratio, R is the internal reflux ratio, L is the effective depth of the biological pond, Q is the water inlet amount, R is the external reflux ratio, R is the internal reflux ratio, L is the oxygen concentration of the oxygen concentration, and the oxygen concentration of the oxygenAnaerobic typeFor the length of the anaerobic zone, LLack ofIs the length of the anoxic zone, LGood tasteIs the length of the aerobic zone.
In one example, the sampling times of the secondary sedimentation water sampling point and the external return sludge sampling point are calculated according to the actual hydraulic retention time of the full plug flow reactor:
wherein T is the sampling time of the sampling point of secondary sedimentation water and the sampling point of external reflux sludge, T1The sampling time of the biological pond water inlet sampling point 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 LAnaerobic typeFor the length of the anaerobic zone, LLack ofIs the length of the anoxic zone, LGood tasteIs the length of the aerobic zone, VTwo sinksThe 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 that the subsequent sampling point and the taken water sample are the same sample is determined. That is, in an ideal plug-flow reactor, the sampling time interval between the ith sampling point and the 1 st sampling point is just the time when the influent sample flows from the 1 st sampling point to the ith sampling point. Therefore, all sampling points and the taken water inlet sample are ensured to be the same sample at different time, and errors caused by water quality fluctuation of the water inlet are avoided.
Sampling point is that the inlet water of the biological pond is a water inlet sample, and the sampling time is T1. The sampling point from the water inlet of the anaerobic zone (after external reflux) to the sampling point and the sampling time of the water outlet of the aerobic zone are calculated according to the actual hydraulic retention time of the complete plug-flow reactor, namely the sampling time is calculated by a formula (1)And (4) calculating. And calculating the sampling time of the sampling points of the two precipitated water and the sampling points of the external return sludge according to the actual hydraulic retention time of the complete plug-flow reactor, wherein the sampling time of the two sampling points is consistent and is T, and the sampling time is calculated by a formula (2).
In one example, further comprising: and carrying out mud-water separation while sampling each sampling point or within a time threshold, wherein the time threshold is 15 min.
In particular, an efficient sampling method and sample handling is employed. And (6) normally sampling the intake water of the biological tank and the sedimentation water of the sampling point (II) according to the national standard. Sampling point (after external reflux), anaerobic zone water outlet, anoxic zone water inlet (after internal reflux), anoxic zone water outlet, aerobic zone water inlet, sampling point (after internal reflux), sampling point (after anaerobic zone water outlet), aerobic zone water inlet, sampling point (after anaerobic zone water outlet), sampling point (after aerobic zone water outlet), sampling by using a sampler with a suction filtration device, and removing active sludge to collect clear liquid. If the sample collected by the suction filtration device is a mud-water mixture, mud-water separation is finished within 15min to avoid continuous reaction of the activated sludge and the water sample, and the way of mud-water separation can be field sedimentation to take supernatant or centrifugation to take supernatant. Sampling point ninthly, collecting 2 bottles of samples from external return sludge, collecting 1 bottle of clear liquid and removing activated sludge by the method, normally sampling 1 bottle according to national standard, and adding H2SO4The pH value is adjusted to be less than or equal to 2.
Detecting sampling results, and calculating the nitrate nitrogen concentration of the inlet water of the anaerobic zone and the inlet water of the anoxic zone; in one example, if a sludge return inlet is arranged in the functional area, the nitrate nitrogen concentration of the sampling point at the head end of the functional area is obtained by calculating the nitrate nitrogen concentration and the water quantity of each afflux water flow converged at the point;
calculating the nitrate nitrogen concentration of the anaerobic zone feed water by equation (3):
calculating the nitrate nitrogen concentration of the anoxic zone feed water by equation (4):
wherein, Cx,yThe 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 ninthly, sampling the external return sludge at the sampling point according to the national standard, adjusting a sludge-water mixed sample with the pH value of less than or equal to 2, diluting the sample to a proper concentration, and detecting total nitrogen and total phosphorus items of the sludge-water mixture according to alkaline potassium persulfate digestion ultraviolet spectrophotometry (HJ 636-2012) for measuring total nitrogen in water and ammonium molybdate spectrophotometry (GB11893-89) for measuring total phosphorus in water, instead of detecting the total nitrogen and total phosphorus items of the solid sludge according to the sludge inspection method in the sludge inspection method (CJ/T221-2005) of the municipal sewage treatment plant. And detecting the rest samples according to a national standard detection method.
And 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 nitrate nitrogen brought back by the return sludge can cause the nitrate nitrogen concentration detection value of the sample to be less than the actual nitrate nitrogen concentration of the sampling point. If the functional area is provided with a sludge return inlet, the nitrate nitrogen concentration of the sampling point at the head end of the functional area is calculated by the nitrate nitrogen concentration and the water quantity of each afflux water flow converged at the point, and the detection value of the sample is not used. Namely, the nitrate nitrogen concentration of the inlet water (after external reflux) of the anaerobic zone is a formula (3), and the nitrate nitrogen concentration of the inlet water (after internal reflux) of the anoxic zone is a formula (4).
Calculation of A2Evaluation of Total Nitrogen removal in the course of the/O Process and phosphorus migration in the functional regions of the biological cell2The nitrogen and phosphorus removal operation effect of the/O process biological system; in one example, A is calculated2The total nitrogen removal in the course of the/O process comprises:
calculation of A2Nitrogen content data of each link of the/O process and each functional area of the biological pond;
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 a set threshold value, the in-process total nitrogen removal rate is calculated according to the nitrogen content data.
In one example, the in-path total nitrogen removal is calculated by equation (5):
wherein, γTNFor nitrogen removal, Ma,bThe total amount of contamination for item b at location a.
Specifically, calculate A2The nitrogen content of each link of the second-level biological treatment system of the/O process and each functional area of the biological pool comprises:
the total nitrogen amount of the inlet water is as follows:
the total nitrogen content of the secondary precipitated 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:
the nitrogen content removed by denitrification of the secondary sedimentation tank and the external return sludge is as follows:
wherein Q isRow boardM is the residual sludge discharge3。
According to the principle of material balance, A is calculated by formula (19)2Total nitrogen recovery rate of the/O process biological system:
wherein eta isTNFor total nitrogen recovery, Ma,bJudging whether the error of the total nitrogen recovery rate is smaller than a set threshold value or not for the total amount of pollutants in the item b of the position a; if the error of the total nitrogen recovery rate is less than the set threshold value, i.e. | etaTN-1|≤z1From the nitrogen content data, the in-situ total nitrogen removal was calculated by equation (5).
In one example, A is calculated2The phosphorus mobility of each functional area of the/O process biological pool comprises the following steps:
calculation of A2The phosphorus content data of each link of the second-level biological treatment system of the O process is calculated, the total phosphorus recovery rate is checked, and whether the phosphorus balance rate of the biological system meets the requirement or not is judged;
calculating phosphorus migration volume data of each functional zone, wherein the phosphorus migration volume data comprises phosphorus migration volume of an anaerobic zone, phosphorus migration volume of an anoxic zone, phosphorus migration volume of an aerobic zone, phosphorus migration volume of a secondary sedimentation tank and phosphorus migration volume of a sludge backflow process;
calculating the phosphorus migration equilibrium rate, and judging whether the error of the phosphorus migration equilibrium rate is smaller than a set threshold value or not;
and if the error of the phosphorus migration equilibrium rate is smaller than a set threshold value, calculating the phosphorus migration rate of each functional area according to the phosphorus migration volume data.
In one example, the phosphorus transport amount in the anaerobic zone is calculated by the formula (6):
calculating the phosphorus migration amount of the anoxic zone by the formula (7):
calculating the phosphorus migration amount of the aerobic zone by the formula (8):
calculating the phosphorus migration volume in the secondary sedimentation tank and the sludge return process by a formula (9):
the phosphorus mobility equilibrium is calculated by equation (10):
the mobility of phosphorus in each functional region was calculated by the formula (11):
wherein, muPIs equilibrium rate of phosphorus mobility, gammaPIs phosphorus mobility, Ma,bTotal amount of contaminants in item b at position a, R is external reflux ratio, R is internal reflux ratio, Cx,yIs the concentration of the contaminant at position x item y, Q is the amount of inlet water, QRow boardThe sludge discharge amount of the residual sludge is obtained.
Specifically, calculate A2Phosphorus content package of each link of second-stage biological treatment system of O processComprises the following steps:
the total phosphorus content of the influent water is:
the total phosphorus content of the effluent is as follows:
the phosphorus content of the residual sludge is as follows:
according to the principle of material balance, calculate A2The total phosphorus recovery rate of the second-level biological treatment system of the/O process is as follows:
wherein eta isTPJudging whether the error of the total phosphorus recovery rate is smaller than a set threshold value or not for the total phosphorus recovery rate; if the error of the total phosphorus recovery rate is less than the set threshold value, i.e. | etaTP-1|≤z2And the phosphorus balance rate of the biological system meets the requirement.
Since phosphorus element only migrates in liquid phase and solid phase, A is calculated2The phosphorus migration quantity of each functional area of the/O process biological pool comprises the following steps:
the phosphorus transfer amount in the anaerobic zone is a formula (6), the phosphorus transfer amount in the anoxic zone is a formula (7), the phosphorus transfer amount in the aerobic zone is a formula (8), and the phosphorus transfer amount in the secondary sedimentation tank and the sludge return process is a formula (9). The positive values of the calculation results in the formulas (6) to (9) indicate the migration of phosphorus from the liquid phase to the solid phase, and the negative values indicate the migration of phosphorus from the solid phase to the liquid phase.
According to the principle of material balance, calculate A2The phosphorus migration equilibrium rate of the/O process biological system is shown as a formula (10), and whether the error of the phosphorus migration equilibrium rate is smaller than the set value or not is judgedA threshold value; if the error of the phosphorus mobility equilibrium ratio is less than the set threshold value, i.e. | muP-1|≤z3And calculating the mobility of phosphorus in each functional area according to the phosphorus migration amount data and checking the phosphorus migration equilibrium rate by the formula (11).
To facilitate understanding of the solution of the embodiments of the present invention and the effects thereof, three specific application examples are given below. It will be understood by those skilled in the art that this example is merely for the purpose of facilitating an understanding of the present invention and that any specific details thereof are not intended to limit the invention in any way.
Example 1
FIG. 2 shows A according to an embodiment of the invention2A flow chart of steps of a method for calculating the nitrogen and phosphorus removal operation effect of the/O process.
As shown in FIG. 2, this A2The method for calculating the nitrogen and phosphorus removal operation effect of the/O process 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 each sampling point; 103, detecting a sampling result, and calculating the nitrogen concentration of the nitrate; step 104, calculate A2Evaluation of Total Nitrogen removal in the course of the/O Process and phosphorus migration in the functional regions of the biological cell2The nitrogen and phosphorus removal operation effect of the/O process biological system.
Select a certain A2The 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 structure of the secondary biological treatment system and the operating parameters are shown in the table 1.
TABLE 1
Setting the sampling time of inlet water of the biological pool as 0:00, calculating the sampling time of subsequent sampling points which correspond to the inlet water of the biological pool one by one according to the actual hydraulic retention time principle and the formula (1) and the formula (2), and obtaining the calculation results of the distance between the subsequent sampling points and the head end of the biological pool and the sampling time in a table 2.
TABLE 2
| Serial number | Sampling point location | Distance m from the head end of the biological pond | Sampling time |
| ① | Biological pond inlet water | 0 | 0:00 |
| ② | Anaerobic zone water intake (after external reflux) | 7 | 0:06 |
| ③ | Anaerobic zone effluent | 55 | 0:50 |
| ④ | Anoxic zone water intake (after internal reflux) | 65 | 0:55 |
| ⑤ | Water outlet of anoxic zone | 202 | 1:43 |
| ⑥ | Water inlet in aerobic zone | 203 | 1:44 |
| ⑦ | Water outlet of aerobic zone | 550 | 3:45 |
| ⑧ | Secondary sedimentation yielding water | / | 8:53 |
| ⑨ | External reflux sludge | / | 8:53 |
Sludge backflow is arranged at the sampling points (after external backflow) and (after internal backflow) of the anaerobic zone, and nitrate nitrogen brought back by the easily degradable carbon source and the backflow sludge in the inflow water is subjected to rapid denitrification reaction, so that the nitrate nitrogen concentration detection values of the two sampling points are smaller than the actual nitrate nitrogen concentration. The nitrate nitrogen concentration of these two sampling points should be calculated from the nitrate nitrogen concentration and the amount of water in each of the influent streams that converge at this point. The nitrate nitrogen concentration and the water amount of the influent water flow of the influent water (after external reflux) of the anaerobic zone and the influent water (after internal reflux) of the anoxic zone at sampling points are shown in table 3, and the nitrate nitrogen concentration of the anaerobic zone is 3.69mg/L and the nitrate nitrogen concentration of the anoxic zone is 4.76mg/L according to the formulas (3) to (4).
TABLE 3
| Nitrate nitrogen mg/L | |||
| Biological pond inlet water | 0.726 | External reflux ratio | 0.94 |
| Anaerobic zone effluent | 0.164 | Internal reflux ratio | 1.61 |
| Water outlet of aerobic zone | 10.3 | ||
| External reflux sludge clear liquid | 6.85 |
Example 2
Select a certain A2The sampling points are set according to the figure 1 in the/O process sewage treatment plant, and the pollutant concentration and the operation parameters of the sewage treatment plant of each sampling point are shown in a table 4.
TABLE 4
A is calculated according to the formulas (12) to (18)2The nitrogen contents of each link of the secondary biological treatment system of the/O process and each functional area of the biological pond are shown in the second column of the table 5. The total nitrogen recovery was calculated to be 105.6% according to equation (19). Setting the error threshold value to be 10%, checking the total nitrogen recovery rate, and enabling the nitrogen balance rate of the biological system to meet the requirement. Then, A is calculated according to the formula (5)2The nitrogen removal rates of the links of the secondary biological treatment system of the/O process and the functional zones of the biological tank are shown in the third column of Table 5.
TABLE 5
Example 3
Select a certain A2The sampling points are set according to the figure 1 in the/O process sewage treatment plant, and the pollutant concentration and the operation parameters of the sewage treatment plant of each sampling point are shown in a table 6.
TABLE 6
A is calculated according to the formulas (20) to (22)2The phosphorus content in 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 value to be 10%, checking the total phosphorus recovery rate, and conforming the phosphorus balance rate of the biological systemAnd (4) requiring.
TABLE 7
| Phosphorus content kg | |
| The total phosphorus content of the feed water | 216 |
| The total phosphorus content of the secondary precipitated water | 3 |
| Phosphorus content of excess sludge | 196 |
| Total up to | 199 |
A was calculated according to equations (6) to (9)2The phosphorus transport in the individual functional zones of the/O process biological pond is shown in the second column of Table 8. Calculating A according to equation (10)2The phosphorus migration equilibrium rate of the/O process biological system is 104 percent. Setting the error threshold value to be 10%, and checking the phosphorus migration equilibrium rate to know that the phosphorus migration equilibrium rate meets the requirement. Then, A is calculated according to formula (11)2The results of the phosphorus mobilities of the functional zones of the/O process biological pond are shown in the third column of Table 8.
TABLE 8
| Phosphorus migration amount kg | Mobility ratio | |
| Phosphorus migration in anaerobic zone | -55 | -38％ |
| Phosphorus migration in anoxic zones | 171 | 120％ |
| Phosphorus migration in aerobic zones | 22 | 16％ |
| Secondary sedimentation tank and phosphorus migration in sludge return process | 3 | 2.5％ |
| Amount of feed water SP | 138 | |
| Amount of secondary effluent SP | 1.8 |
It will be appreciated by persons skilled in the art that the above description of embodiments of the invention is intended only to illustrate the benefits of embodiments of the invention and is not intended to limit embodiments of the invention to any examples given.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not 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 described embodiments.
Claims (10)
1. A2The method for calculating the nitrogen and phosphorus removal 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 nitrogen concentration of the nitrate;
calculation of A2Evaluation of Total Nitrogen removal in the course of the/O Process and phosphorus migration in the functional regions of the biological cell2The nitrogen and phosphorus removal operation effect of the/O process biological system.
2. A according to claim 12The method for calculating the nitrogen and phosphorus removal operation effect of the/O process comprises 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.
3. A according to claim 22The method for calculating the nitrogen and phosphorus removal operation effect of the/O process comprises the step of determining the sampling time of the follow-up sampling point corresponding to the same sample as the taken water sample on the basis of the actual hydraulic retention time of the biological pond.
4. A according to claim 32The method for calculating the nitrogen and phosphorus removal operation effect of the/O process comprises the following steps of calculating the water inlet sampling point of the anaerobic zone, the water outlet sampling point of the anaerobic zone, the water inlet sampling point of the anoxic zone and the anoxic zone by a formula (1)Sampling time of an oxygen zone effluent sampling point, an aerobic zone influent sampling point and an aerobic zone effluent sampling point:
wherein, T1Sampling time, T, of a sampling point for the intake of a biological tankiIs the sampling time of the ith sample point, LiThe distance from the ith sampling point to the head end of the biological pool, i belongs to [2,7 ]]When i is 2, the sampling point of anaerobic zone water inlet is shown, when i is 3, the sampling point of anaerobic zone water outlet is shown, when i is 4, the sampling point of anoxic zone water inlet is shown, when i is 5, the sampling point of anoxic zone water outlet is shown, when i is 6, the sampling point of aerobic zone water inlet is shown, when i is 7, the sampling point of aerobic zone water outlet is shown, W is the width of the biological pond, H is the effective depth of the biological pond, Q is the water inlet amount, R is the external reflux ratio, R is the internal reflux ratio, L is the effective depth of the biological pond, Q is the water inlet amount, R is the external reflux ratio, R is the internal reflux ratio, L is the oxygen concentration of the oxygen concentration, and the oxygen concentration of the oxygenAnaerobic typeFor the length of the anaerobic zone, LLack ofIs the length of the anoxic zone, LGood tasteIs 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 sampling point of secondary sedimentation water and the sampling point of external reflux sludge, VTwo sinksThe volume of the secondary sedimentation tank.
5. A according to claim 12The method for calculating the nitrogen and phosphorus removal operation effect of the/O process further comprises the following steps:
and carrying out mud-water separation while sampling each sampling point or within a time threshold, wherein the time threshold is 15 min.
6. A according to claim 12Calculation of nitrogen and phosphorus removal operation effect of/O processThe method comprises the steps that if a sludge backflow inlet is formed 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 amount of each afflux water flow converged at the point;
calculating the nitrate nitrogen concentration of the anaerobic zone feed water by equation (3):
calculating the nitrate nitrogen concentration of the anoxic zone feed water by equation (4):
wherein, Cx,yThe contaminant concentration at position x item y, R is the external reflux ratio, and R is the internal reflux ratio.
7. A according to claim 12The method for calculating the nitrogen and phosphorus removal operation effect of the/O process comprises the following steps of calculating A2The total nitrogen removal in the course of the/O process comprises:
calculation of A2Nitrogen content data of each link of the/O process and each functional area of the biological pond;
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 a set threshold value, calculating the in-process total nitrogen removal rate according to nitrogen content data.
8. A according to claim 72The method for calculating the nitrogen and phosphorus removal operation effect of the/O process comprises the following steps of calculating the in-situ total nitrogen removal rate by a formula (5):
wherein, γTNFor nitrogen removalRate, Ma,bThe total amount of contamination for item b at location a.
9. A according to claim 12The method for calculating the nitrogen and phosphorus removal operation effect of the/O process comprises the following steps of calculating A2The phosphorus mobility of each functional area of the/O process biological pool comprises the following steps:
calculation of A2The phosphorus content data of each link of the second-level biological treatment system of the O process is calculated, the total phosphorus recovery rate is checked, and whether the phosphorus balance rate of the biological system meets the requirement or not is judged;
calculating phosphorus migration volume data of each functional zone, wherein the phosphorus migration volume data comprises phosphorus migration volume of an anaerobic zone, phosphorus migration volume of an anoxic zone, phosphorus migration volume of an aerobic zone, phosphorus migration volume of a secondary sedimentation tank and phosphorus migration volume of a sludge backflow process;
calculating the phosphorus migration equilibrium rate, and judging whether the error of the phosphorus migration equilibrium rate is smaller than a set threshold value or not;
and if the error of the phosphorus migration equilibrium rate is smaller than a set threshold value, calculating the phosphorus migration rate of each functional area according to the phosphorus migration volume data.
10. A according to claim 92The method for calculating the nitrogen and phosphorus removal operation effect of the/O process comprises the following steps of calculating the phosphorus migration amount of the anaerobic zone through a formula (6):
calculating the phosphorus migration amount of the anoxic zone by a formula (7):
calculating the phosphorus migration amount of the aerobic zone by a formula (8):
calculating the phosphorus migration amount in the secondary sedimentation tank and the return sludge process by a formula (9):
the phosphorus mobility equilibrium is calculated by equation (10):
the mobility of phosphorus in each functional region was calculated by the formula (11):
wherein, muPIs equilibrium rate of phosphorus mobility, gammaPIs phosphorus mobility, Ma,bTotal amount of contaminants in item b at position a, R is external reflux ratio, R is internal reflux ratio, Cx,yIs the concentration of the contaminant at position x item y, Q is the amount of inlet water, QRow boardThe sludge discharge amount of the residual sludge is obtained.
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| CN115448531A (en) * | 2022-08-19 | 2022-12-09 | 北京工商大学 | Method for correcting internal and external reflux ratio of A2/O process |
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| CN105776544B (en) * | 2016-05-06 | 2018-06-12 | 云南大学 | A kind of ANSAOAO continuous flow double sludge denitrification advanced nitrogen dephosphorization apparatus and technique based on On-line Control |
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| CN115448531A (en) * | 2022-08-19 | 2022-12-09 | 北京工商大学 | Method for correcting internal and external reflux ratio of A2/O process |
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