CN113044973B - Sewage treatment control system and effluent TN control method - Google Patents

Sewage treatment control system and effluent TN control method Download PDF

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CN113044973B
CN113044973B CN202110288436.5A CN202110288436A CN113044973B CN 113044973 B CN113044973 B CN 113044973B CN 202110288436 A CN202110288436 A CN 202110288436A CN 113044973 B CN113044973 B CN 113044973B
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value
carbon source
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water
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CN113044973A (en
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刘宏波
黄�俊
梅益军
邓壮
袁淼卉
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Suzhou Meimiao Environmental Protection Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/20—Total organic carbon [TOC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate

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Abstract

The invention discloses a sewage treatment control system and a water outlet TN control method, which comprise a water inlet flow for measuring water inlet quantity QThe meter is used for monitoring a water outlet TN detector with a water outlet TN monitoring value N2, a dosing structure for controlling the dosing quantity q of an external carbon source, a controller and a nitrate nitrogen detector for monitoring a nitrate nitrogen detection value N1, wherein the controller is respectively connected with the water inlet flowmeter, the water outlet TN detector, the dosing structure and the nitrate nitrogen detector, and the controller calculates a COD equivalent value q · . According to the invention, according to the real-time data such as the inflow water flow and the nitrate nitrogen in the anoxic zone, the system automatically analyzes whether the carbon source quantity required by denitrification meets the requirement, if not, the required actual carbon source quantity is automatically calculated, and the output signal controls the starting and the adjustment of the carbon source metering pump, so that the safety, the energy conservation and the automatic optimization of total nitrogen removal are realized, the adjustment hysteresis is avoided, and the stable operation of the process is facilitated.

Description

Sewage treatment control system and effluent TN control method
Technical Field
The invention relates to a sewage treatment control system and a water outlet TN control method.
Background
In order to ensure that effluent TN (Total Nitrogen, total inorganic and organic Nitrogen in water) reaches the standard, technical measures of reinforced denitrification by adding a carbon source to an anoxic tank are generally adopted. Particularly, the local emission standard which is stricter than the first-stage A standard is issued and implemented in succession at present, the TN concentration limit value is generally up to 10mg/L, most sewage treatment plants adopt advanced treatment such as denitrification filters, deep bed filters or combined filters to keep stable and reach the standard, the technology has the defects of high capital investment, high operation cost and the like, secondary lifting equipment is required, and therefore, how to fully exploit the potential of biological denitrification of an additional carbon source in secondary treatment is a hot spot of current research.
The anoxic Chi Tanyuan addition control mode of the urban sewage treatment plant in actual operation mainly comprises the following two modes:
(1) Manual control and adjustment: generally, an operation manager manually regulates and controls the carbon source adding amount according to the TN concentration change trend of the outlet water or the COD/TN value of inlet water quality monitoring, and the manually regulated and controlled carbon source adding amount is constant in a period of time due to the particularity of the inlet water and outlet water on-line monitoring value, which is usually a value only once in 2 hours. When the TN value of the effluent is increased, the carbon source adding amount is increased, and when the TN value of the effluent is decreased, the carbon source adding amount is decreased.
(2) PID control adjustment based on feed-forward of feed-water values: by setting a specific COD/TN value, and then according to online monitoring values of relevant indexes (COD (chemical oxygen demand), TN, ammonia nitrogen and the like) of the water quality of the incoming water, the difference value of the two values automatically controls the carbon source adding amount through a PLC.
In actual operation, no matter manual control adjustment or PID control adjustment based on feed-forward of water inlet values, the problems of feedback hysteresis of water inlet and outlet values exist, so that the determined carbon source addition amount is inaccurate, the insufficient carbon source addition amount can cause the risk of exceeding the standard of effluent TN, and the excessive carbon source addition amount can cause a series of problems of carbon source waste, high carbon source addition cost, increased aeration amount, increased energy consumption and the like.
Disclosure of Invention
Aiming at the problems, the invention provides a sewage treatment control system and a water outlet TN control method, which can realize the accurate control of the water outlet TN, reduce the sewage treatment cost under the condition that the water outlet TN meets the standard, and can be widely applied to sewage treatment plants in various towns.
In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme:
the utility model provides a sewage treatment control system, includes the inflow flowmeter that is used for measuring inflow Q, is used for the play water TN detector of monitoring play water TN monitor value N2, is used for controlling the adding structure of adding quantity Q that adds the carbon source, still includes the controller and is used for monitoring nitrate nitrogen detector of nitrate nitrogen monitor value N1, the controller links to each other with inflow flowmeter, play water TN detector, adding structure and nitrate nitrogen detector respectively, the controller calculates COD equivalent value Q · ：
When N2 < N3:
q · ＝c*[N1*(r+R+1)-(N3-N2)]mg/L COD；
when N2 > N3:
q · ＝c*[N1*(r+R+1)]mg/L COD；
wherein c is the denitrification carbon nitrogen ratio; n1 is a nitrate nitrogen detection value; r is the internal reflux of nitrifying liquid; r is sludge external reflux; n3 is TN value of the water to be discharged according to the discharge requirement; n2 is a monitoring value of the TN of the effluent;
the controller is used for controlling the flow rate according to the COD equivalent value q · And the added carbon source adding quantity Q which needs to be added actually is obtained by combining the carbon source type and the water inflow quantity Q and controlling the adding structure to carry out adding.
Preferably, the R value is 100-300%, the R value is 50-150%, and the c value is 3-7.
Preferably, the monitoring point of the nitrate nitrogen detector and the carbon source adding point are arranged at the same position of the anoxic tank.
Preferably, the monitoring point of the nitrate nitrogen detector and the carbon source adding point are arranged at the position where the denitrification of the water inlet carbon source is finished.
A control method of TN (total suspended solids) of sewage treatment effluent comprises the following steps:
1) Calculating COD equivalent value q · ：
When N2 < N3:
q · ＝c*[N1*(r+R+1)-(N3-N2)]mg/L COD；
when N2 > N3:
q · ＝c*[N1*(r+R+1)]mg/L COD；
wherein c is the denitrification carbon nitrogen ratio; n1 is a nitrate nitrogen detection value; r is the internal reflux of nitrifying liquid; r is sludge external reflux; n3 is TN value of the water to be discharged according to the discharge requirement; n2 is a monitoring value of the TN of the effluent;
2) According to COD equivalent value q · And the added carbon source adding quantity Q which needs to be added actually is obtained by combining the carbon source type and the water inflow quantity Q and controlling the adding structure to carry out adding.
Preferably, the R value is 100-300%, the R value is 50-150%, and the c value is 3-7.
Preferably, the monitoring point of the nitrate nitrogen detector and the carbon source adding point are arranged at the same position of the anoxic tank.
Preferably, the monitoring point of the nitrate nitrogen detector and the carbon source adding point are arranged at the position where the denitrification of the water inlet carbon source is finished.
Preferably, the position of the carbon source of the feed water after denitrification is utilized is determined by the following steps:
A. the operation condition of the process is kept unchanged, a water inlet is arranged for sampling 1 point, sampling points 2-N are sequentially arranged from the head end of the anoxic tank to the tail end at equal intervals, wherein the head end of the anoxic tank is sampling 2 points, and the hydraulic retention time from sampling Q point to sampling P point is T PQ P=q+1 and p+.n;
B. sampling is carried out at a sampling point 1 at a time T1, sampling is carried out at a sampling point 2 at a time T2, sampling is carried out at a sampling point 3 at a time T3, and so on, sampling is carried out at a sampling point N at a time TN, and COD change of each sampling point is monitored; wherein t2=t1+t 21 ，T3＝T2+T 32 ，……TN＝T(N-1)+T N(N-1) ；
C. According to the recent analysis of inflow COD data, the actually measured inflow COD concentration is ranked from small to large, and the frequency L of occurrence of a certain concentration is calculated according to L=m/(M+1), wherein M is the total number of the actually measured data, and M is the ranking number of a certain concentration value;
D. the COD concentration is taken as an abscissa, the frequency L is taken as an ordinate, a water inflow COD concentration frequency curve is drawn, the accumulated frequency is taken as an index guarantee rate by utilizing a frequency statistical method to determine representative water inflow water quality COD, and a point with the consumed representative water inflow water quality COD is taken as a monitoring point of a nitrate nitrogen detector and a carbon source adding point according to sampling determination.
Preferably, in step B, the sample is taken for several days, several times per day;
in the process of calculating COD equivalent value q · And taking an average value of the nitrate nitrogen detection value N1 and the effluent TN monitoring value N2 in a set time period.
The beneficial effects of the invention are as follows:
1) According to the invention, according to the real-time data such as the inflow water flow and the nitrate nitrogen in the anoxic zone, the system automatically analyzes whether the carbon source quantity required by denitrification meets the requirement, if not, the required actual carbon source quantity is automatically calculated, and the output signal controls the opening and the adjustment of the carbon source metering pump, thereby realizing the safety, the energy conservation and the automatic optimization of total nitrogen removal.
2) According to the invention, the quality of the inflow water is not required to be used as feedforward data, the hysteresis of adjustment is avoided, the carbon source addition can be controlled in real time according to the monitoring value of the unique variable nitrate nitrogen, the stable operation of the process is facilitated, the outflow water TN data can be ensured to be at a stable level, the carbon source addition is automatic, the intervention of personnel is not required, and the manual labor is reduced.
3) Through the whole flow tracking of the biochemical system, synchronous nitrification and denitrification are realized in the biochemical pool in the early stage through the optimization and adjustment of the process operation parameters, and the TN removal effect is improved under the condition of insufficient carbon source.
Drawings
FIG. 1 is a schematic diagram of a sewage treatment control system according to the present invention;
fig. 2 is a flowchart of a method for controlling a TN in the effluent according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific examples, so that those skilled in the art can better understand the present invention and implement it, but the examples are not limited thereto.
As shown in FIG. 1, a sewage treatment control system comprises a water inlet flowmeter for measuring water inflow Q, a water outlet TN detector for monitoring water outlet TN monitoring value N2, a dosing structure for controlling external carbon source dosing quantity Q (a carbon source dosing metering pump is required to be arranged), a controller and a nitrate nitrogen detector for monitoring nitrate nitrogen detection value N1, wherein in FIG. 1, the water inlet flowmeter is arranged at the inlet end of an anaerobic tank, monitoring points of the nitrate nitrogen detector and carbon source dosing points are arranged in an anoxic tank, the water outlet TN detector is arranged at the water outlet of a secondary sedimentation tank, and water is sequentially discharged through the anaerobic tank, the anoxic tank, the aerobic tank and the secondary sedimentation tank for sewage treatment.
The controller is respectively connected with the water inlet flowmeter, the water outlet TN detector, the adding structure and the nitrate nitrogen detector, and the water inlet TN detectorThe controller calculates COD equivalent value q · ：
When N2 < N3:
q · ＝c*[N1*(r+R+1)-(N3-N2)]mg/L COD；
when N2 > N3:
q · ＝c*[N1*(r+R+1)]mg/L COD；
wherein c is the denitrification carbon nitrogen ratio, and the denitrification carbon nitrogen ratio determined by different projects is different and is generally 3-7; n1 is a nitrate nitrogen detection value which is an instantaneous value and needs filtering treatment; r is the internal reflux of nitrified liquid, and the value is generally 100% -300%; r is sludge external reflux, and is generally 50% -150%; n3 is TN value of the water to be discharged according to the discharge requirement; n2 is a water outlet TN monitoring value, and the water outlet TN is monitored by a water outlet TN detector and is an intermittent value.
The controller is used for controlling the flow rate according to the COD equivalent value q · And the added carbon source adding quantity Q which needs to be added actually is obtained by combining the carbon source type and the water inflow quantity Q and controlling the adding structure to carry out adding. That is, the calculated value is a COD equivalent value, and the conversion needs to be performed in consideration of the type of the carbon source and the water inflow amount Q, where COD refers to an index, and the conversion is continued later (mg/L is calculated in the conversion of the type of the carbon source, and the unit of the addition amount of the carbon source is L/h, and the conversion is performed with Q), for example:
the COD equivalent of acetic acid is calculated by 1.07kg COD/kg acetic acid, and after the COD equivalent value of the external carbon source is calculated by a formula, the COD equivalent value is converted into the adding amount requirement of the carbon source type.
Assuming that the TN standard of the effluent of a sewage treatment plant is controlled to be 10mg/L, the TN of the actual effluent is 9mg/L at present, the real-time nitrate nitrogen value is 2mg/L, the internal and external reflux ratios are respectively 200% and 80%, and the carbon nitrogen ratio is 4, then the COD equivalent value q of carbon is added · ＝4*[2*(2+1+0.8)-1]26.4mg/L, then the acetic acid addition amount is 26.4/1.07=24.6 mg/L, considering the carbon source type; if the water inflow is 500m 3 Acetic acid density of 1.05g/cm 3 The final addition amount of acetic acid is: 11.7L/h, and so on if other carbon sources are utilized by a sewage treatment plant.
Preferably, the monitoring point of the nitrate nitrogen detector and the carbon source adding point are arranged at the same position of the anoxic tank, and are arranged at the position where the denitrification of the water inlet carbon source is used up as much as possible.
Before actual operation, the on-line monitoring instrument of the water quality of the water inflow cannot respond in real time because of the fluctuation of the water quality of the water inflow, so the water quality of the water inflow is not taken as an influence factor to be introduced into a calculation formula, the influence of the hysteresis of data on a calculation result is prevented, but the calculation formula needs to sample and determine the point of the water inflow carbon source that is utilized by denitrification.
Preferably, the position of the carbon source of the feed water after denitrification is utilized is determined by the following steps:
A. the operation condition of the process is kept unchanged, a water inlet is arranged for sampling 1 point, sampling points 2-N are sequentially arranged from the head end of the anoxic tank to the tail end at equal intervals, wherein the head end of the anoxic tank is sampling 2 points, and the hydraulic retention time from sampling Q point to sampling P point is T PQ P=q+1 and p+.n;
B. sampling is carried out at a sampling point 1 at a time T1, sampling is carried out at a sampling point 2 at a time T2, sampling is carried out at a sampling point 3 at a time T3, and so on, sampling is carried out at a sampling point N at a time TN, and COD change of each sampling point is monitored; wherein t2=t1+t 21 ，T3＝T2+T 32 ，……TN＝T(N-1)+T N(N-1) ；
C. According to the recent analysis of inflow COD data, the actually measured inflow COD concentration is ranked from small to large, and the frequency L of occurrence of a certain concentration is calculated according to L=m/(M+1), wherein M is the total number of actually measured data, M is more than 50, and M is the ranking number of a certain concentration value;
D. the representative inflow water quality COD of the project is determined by taking 85% of the index guarantee rate by using a frequency statistical method, namely, the representative inflow water quality COD is determined by taking 85% of the accumulated frequency as the index guarantee rate, and the point of the representative inflow water quality COD consumed by sampling and determination is taken as the monitoring point and the carbon adding point of the nitrate nitrogen detector.
Preferably, in step B, the sample is taken for several days, several times per day.
Correspondingly, the control method of the TN of the sewage treatment effluent comprises the following steps:
1) Calculating COD equivalent value q · ：
When N2 < N3:
q · ＝c*[N1*(r+R+1)-(N3-N2)]mg/L COD；
when N2 > N3:
q · ＝c*[N1*(r+R+1)]mg/L COD；
wherein c is the denitrification carbon nitrogen ratio; n1 is a nitrate nitrogen detection value; r is the internal reflux of nitrifying liquid; r is sludge external reflux; n3 is TN value of the water to be discharged according to the discharge requirement; n2 is a monitoring value of the TN of the effluent;
2) According to COD equivalent value q · And the added carbon source adding quantity Q which needs to be added actually is obtained by combining the carbon source type and the water inflow quantity Q and controlling the adding structure to carry out adding.
Preferably, the R value is 100-300%, the R value is 50-150%, and the c value is 3-7. The internal and external reflux amounts R and R are directly input according to the running condition of the on-site working condition, wherein the R is 200% generally, and the R is 100%. The carbon-nitrogen ratio c is generally 4, and the specific value can be changed according to the sludge activity of different projects.
When the effluent TN standard is used for executing the first-level A15mg/L of pollutant emission standard of urban sewage treatment plant (GB 18918-2002), the N3 control value is generally 10mg/L, and when the effluent TN standard is used for executing the regional standard which is generally 10mg/L, the N3 control value is generally 7mg/L.
Preferably, the monitoring point of the nitrate nitrogen detector and the carbon source adding point are arranged at the same position of the anoxic tank, and are arranged at the position where the denitrification of the water inlet carbon source is used up as much as possible.
Preferably, the position of the carbon source of the feed water after denitrification is utilized is determined by the following steps:
A. the operation condition of the process is kept unchanged, a water inlet is arranged for sampling 1 point, sampling points 2-N are sequentially arranged from the head end of the anoxic tank to the tail end at equal intervals, wherein the head end of the anoxic tank is sampling 2 points, and the hydraulic retention time from sampling Q point to sampling P point is T PQ P=q+1 and p+.n;
B. sampling at a sampling point 1 at a time T1 and sampling at a sampling point 2 at a time T2Sampling is carried out at a sampling point 3 at a time T3, and then the sampling is carried out at a sampling point N at a time TN, so that the COD change of each sampling point is monitored; wherein t2=t1+t 21 ，T3＝T2+T 32 ，……TN＝T(N-1)+T N(N-1) The method comprises the steps of carrying out a first treatment on the surface of the Preferably, in step B, the sample is taken for several days, several times per day.
For example, the process running condition is ensured to be unchanged, a water inlet sampling point (1), an anoxic tank head end (2), a 1/5 sampling point (3), a 2/5 sampling point (4), a 3/5 sampling point (5) and a … … sampling time are set according to the hydraulic retention time, if the hydraulic retention time from the 1 st point to the 2 nd point is 5 hours, the sampling is carried out at the 2 nd point after the 5 hours of the 1 st point sampling, and the COD change of each sampling point is monitored by analogy.
After multiple sampling for multiple days, different COD values of the inflow water are obtained, so that different sampling points for completely degrading the COD are obtained.
C. According to the recent analysis of inflow COD data, the actually measured inflow COD concentration is ranked from small to large, and the frequency L of occurrence of a certain concentration is calculated according to L=m/(M+1), wherein M is the total number of actually measured data, M is more than 50, and M is the ranking number of a certain concentration value;
D. the representative inflow water quality COD of the project is determined by taking 85% of the index guarantee rate by using a frequency statistical method, namely, the representative inflow water quality COD is determined by taking 85% of the accumulated frequency as the index guarantee rate, and the point of the representative inflow water quality COD consumed by sampling and determination is taken as the monitoring point and the carbon adding point of the nitrate nitrogen detector.
In order to improve the control accuracy, COD equivalent value q is calculated · In the specific calculation, the nitrate nitrogen detection value N1 and the effluent TN monitoring value N2 take the average value in the set time period, as shown in fig. 2, the comparison operation is performed once every 2 hours (the interval can be set according to the actual requirement), and in the specific calculation, the average value of the nitrate nitrogen detection value N1 and the effluent TN monitoring value N2 taken in the previous ten minutes is brought into the formula calculation.
The method is characterized in that the water inflow of a sewage treatment plant is designed to be 2.5 ten thousand tons/d, the actual water inflow is about 1.8 ten thousand tons/d, the effluent is subjected to the first-level A standard of pollutant emission Standard of urban sewage treatment plants (GB 18918-2002), an additional carbon source (90% acetic acid) is needed to be added due to the fact that the C/N ratio of the inlet water is insufficient, the carbon source is manually added according to the concentration change trend of the outlet water TN, the carbon source is added when the TN level of the outlet water is high, the carbon source is reduced when the TN level of the outlet water is low, about 72.5g of the carbon source is added per ton of the water, the TN of the outlet water fluctuates between 7.2 and 14.5mg/L, after the method is modified, the TN of the outlet water is stabilized between 7.2 and 9.5mg/L, and the ratio data are shown in the table 1.
Table 1 item comparison of data before and after transformation
Project Daily water treatment per ton Daily carbon source consumption/kg Ton water carbon source consumption/g/ton Out-water TN interval
Before transformation 18239.2 1322.3 72.5 7.2～14.5
After transformation 18015.8 706.9 39.18 7.2～9.5
As can be seen from Table 1, the carbon source of the system after transformation is reduced by about 46% compared with the prior art, the price of 90% acetic acid is calculated by 3200 yuan/ton, the cost of the carbon source can be saved by 1920 yuan each day, about 59 ten thousand yuan can be saved each year, the carbon source dosing is automatic operation, the labor of personnel is saved, the yielding water TN can be controlled and maintained in a narrower interval, the stable operation of a sewage treatment plant is facilitated, and meanwhile, the COD load of a subsequent aerobic tank is reduced due to the small dosage of the carbon source.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures disclosed herein or modifications in equivalent processes, or any application, directly or indirectly, within the scope of the invention.

Claims (1)

1. The utility model provides a sewage treatment control system's play water TN control method which characterized in that, sewage treatment control system includes the water inflow flowmeter that is used for measuring inflow Q, is used for monitoring play water TN monitor value N2's play water TN detector, is used for controlling the adding structure of adding quantity Q of additional carbon source, still includes controller and is used for monitoring nitrate nitrogen detect value N1's nitrate nitrogen detector, the controller links to each other with water inflow flowmeter, play water TN detector, adding structure and nitrate nitrogen detector respectively, sewage treatment control system's play water TN control method includes the following steps:
1) Calculating COD equivalent value q · ：
When N2 < N3:
q · ＝c*[N1*(r+R+1)-(N3-N2)]mg/LCOD；
when N2 > N3:
q · ＝c*[N1*(r+R+1)]mg/LCOD；
wherein c is the denitrification carbon nitrogen ratio; n1 is a nitrate nitrogen detection value, and the unit is milligrams per liter; r is the internal reflux ratio of the nitrified liquid; r is the external reflux ratio of the sludge; n3 is TN value of water to be discharged according to the discharge requirement, and the unit is milligrams per liter; n2 is a monitoring value of TN of the effluent, and the unit is milligrams per liter;
2) According to COD equivalent value q · The method comprises the steps of combining the type of a carbon source and the water inflow quantity Q to obtain the added carbon source adding quantity Q which needs to be added actually, controlling an adding structure to carry out adding, wherein the R value is 100% -300%, the R value is 50% -150%, the c value is 3-7, the monitoring point of a nitrate nitrogen detector and the carbon source adding point are arranged at the same position of an anoxic pond, the monitoring point of the nitrate nitrogen detector and the carbon source adding point are arranged at the position of the water inflow carbon source where denitrification is used, and the position of the water inflow carbon source where denitrification is used is determined by the following steps:
A. the operation condition of the process is kept unchanged, a water inlet is arranged for sampling 1 point, sampling points 2-N are sequentially arranged from the head end of the anoxic tank to the tail end at equal intervals, wherein the head end of the anoxic tank is sampling 2 points, and the hydraulic retention time from sampling Q point to sampling P point is T PQ P=q+1 and p+.n;
B. sampling is carried out at a sampling point 1 at a time T1, sampling is carried out at a sampling point 2 at a time T2, sampling is carried out at a sampling point 3 at a time T3, and so on, sampling is carried out at a sampling point N at a time TN, and COD change of each sampling point is monitored; wherein t2=t1+t 21 ，T3＝T2+T 32 ，……TN＝T(N-1)+T N(N-1) ；
C. According to the recent analysis of inflow COD data, the actually measured inflow COD concentration is ranked from small to large, and the frequency L of occurrence of a certain concentration is calculated according to L=m/(M+1), wherein M is the total number of the actually measured data, and M is the ranking number of a certain concentration value;
D. drawing a water inflow COD concentration frequency curve by taking COD concentration as an abscissa and frequency L as an ordinate, determining representative water inflow COD by taking an accumulated frequency of 85% as an index guarantee rate by utilizing a frequency statistical method, taking a point with the consumed representative water inflow COD as a monitoring point of a nitrate nitrogen detector and a carbon source adding point according to sampling determination, and sampling for a plurality of days in the step B, wherein the sampling is carried out for a plurality of times every day;
in calculating COD equivalent value q · And taking an average value of the nitrate nitrogen detection value N1 and the effluent TN monitoring value N2 in a set time period.
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CN113044973B true CN113044973B (en) 2023-05-16

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