CN114684909A - Leachate aerobic treatment control method - Google Patents
Leachate aerobic treatment control method Download PDFInfo
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- CN114684909A CN114684909A CN202210292485.0A CN202210292485A CN114684909A CN 114684909 A CN114684909 A CN 114684909A CN 202210292485 A CN202210292485 A CN 202210292485A CN 114684909 A CN114684909 A CN 114684909A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000010802 sludge Substances 0.000 claims description 43
- 230000001105 regulatory effect Effects 0.000 claims description 41
- 238000005273 aeration Methods 0.000 claims description 33
- 239000013589 supplement Substances 0.000 claims description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 24
- 239000001301 oxygen Substances 0.000 claims description 24
- 229910052760 oxygen Inorganic materials 0.000 claims description 24
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 23
- 230000002159 abnormal effect Effects 0.000 claims description 14
- 238000000108 ultra-filtration Methods 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 7
- 239000010865 sewage Substances 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000005261 decarburization Methods 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 abstract description 3
- 238000011160 research Methods 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000005276 aerator Methods 0.000 description 1
- 238000013135 deep learning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
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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
- C02F3/02—Aerobic processes
-
- 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
- C02F3/006—Regulation methods for biological treatment
-
- 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
-
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention relates to a leachate aerobic treatment control method, which is used for detecting the quality and the quantity of inlet water and outlet water in real time, realizing accurate addition according to the actual requirements of the quality and the quantity of the water on a carbon source and control, avoiding system fluctuation caused by factors such as personnel experience, personnel misoperation, personnel post change and the like, and reducing the influence of unqualified sewage discharge on enterprises and the environment; the total nitrogen of the effluent of the leachate aerobic system reaches the standard by detecting nitrogen elements in the inlet and outlet water of the aerobic tank and accurately calculating the addition amount of a carbon source under the dual standards of denitrification and decarburization; and the required air quantity can be accurately calculated through water quality, so that the aerobic system is ensured to be aerated as required without overexposure, and the energy consumption of the aerobic system can be greatly reduced.
Description
Technical Field
The invention relates to a leachate aerobic treatment control method, and belongs to the technical field of leachate treatment.
Background
At present, key steps in a leachate aerobic treatment system, such as carbon source supplement, sludge discharge, aeration, effluent quality control and the like, are basically controlled manually and are mainly operated by the experience of operators.
In the prior art, such as a precise aeration method of a garbage leachate aerobic system (patent number CN113233590A), the patent discloses a precise aeration method of a garbage leachate aerobic system, and the control of aeration air volume of the aerobic system is realized by measuring the water inlet condition of the aerobic system and inputting a control system.
The patent publication No. CN 111680449A discloses a method for realizing accurate aeration based on a deep learning algorithm model, which mainly comprises the steps of collecting data, establishing an algorithm model, calculating the optimal working power of an aerator, and mainly researches the algorithm model of the accurate aeration. The main research of this patent is the intelligent control of whole leachate aerobic system, and the research content is different.
In addition, the application field of the integrated intelligent control system and the control method for sewage treatment (patent No. CN 109111030A) is sewage treatment, and the high-concentration wastewater with high organic matters, high ammonia nitrogen and high salt, such as sewage treatment and leachate, is greatly different.
The control of the existing leachate aerobic system has the following problems:
in the aspect of carbon source supplement, the carbon source is added for 1-2 times every day according to the experience of operators, and the adding time of each time is fixed, so that the adding amount of the carbon source is often excessive or insufficient. Excessive carbon source adding can cause that the dissolved oxygen in the aerobic tank is low, the COD and ammonia nitrogen of the effluent do not reach the standard, the carbon source adding is insufficient, the nitration reaction can not be effectively carried out, and the total nitrogen of the effluent does not reach the standard.
In the aspect of aeration of a leachate aerobic tank, a control mode of interlocking the frequency of a blower and a dissolved oxygen meter is generally adopted. The dissolved oxygen is the content of molecular oxygen in the air dissolved in water, is an index of whether the side reaction aeration quantity is sufficient, and is not the actual oxygen demand for removing organic matters and ammonia nitrogen. Due to careful consideration, oxygen supply systems are generally designed to ensure a dissolved oxygen concentration of 2mg/L, however many activated sludge systems operate well at lower dissolved oxygen concentrations and significantly reduce energy consumption.
In the aspect of discharging sludge in an aerobic tank, the sludge is almost completely manually controlled, the sludge concentration in the aerobic tank is detected by an inspector, when the sludge concentration reaches more than 15mg/L, a part of sludge is discharged at regular time through a sludge discharge pump, the sludge discharge amount, the sludge discharge concentration, the sludge concentration in the aerobic tank after sludge discharge, the sludge age and other key operation parameters of the aerobic tank are not clear, sludge can not be discharged according to requirements and quantity, and the constant sludge concentration and sludge age of the aerobic tank can not be ensured.
Disclosure of Invention
The invention aims to solve the technical problem of providing a leachate aerobic treatment control method, which adjusts the carbon source supplement amount, the aerobic tank aeration amount and the aerobic tank sludge discharge amount according to the real-time inflow water quality and quantity, avoids system operation fluctuation caused by insufficient carbon source, excessive aeration or insufficient water quality and quantity fluctuation, and solves the problems that the operation of the current leachate aerobic treatment system depends on the experience of operators, the aeration energy consumption is high, the sludge property is unstable and the like.
The invention adopts the following technical scheme for solving the technical problems: the invention designs a percolate aerobic treatment control method, which is based on that an adjusting tank is connected with an aerobic tank through a flow regulating valve, and an anaerobic tank is directly connected with the aerobic tank, and the control is carried out aiming at the flow regulating valve according to the following steps A1 to A2, so that the control of the carbon source supplement flow rate of the adjusting tank to the aerobic tank is realized;
step A1, obtaining the COD concentration of the effluent of the regulating reservoir, the ammonia nitrogen content concentration of the effluent of the regulating reservoir, the effluent flow of the anaerobic reservoir, the COD concentration of the effluent of the anaerobic reservoir and the ammonia nitrogen content concentration of the effluent of the anaerobic reservoir, calculating to obtain a carbon source supplement flow according to the COD concentration and the ammonia nitrogen content concentration, and then entering step A2;
step A2, controlling a flow regulating valve according to the carbon source supplement flow to realize the control of the carbon source supplement flow from the regulating tank to the aerobic tank;
simultaneously realizing aeration control to the aerobic tank according to the following steps B1 to B2;
b1, obtaining COD concentration of the effluent of the anaerobic tank, ammonia nitrogen content concentration of the effluent of the anaerobic tank, inflow rate of the anaerobic tank and actual carbon source supplement flow from a flow regulating valve, calculating to obtain aeration gas supply flow according to the actual carbon source supplement flow, and then entering step B2;
and B2, controlling a fan according to the aeration air supply flow, and adjusting the actual aeration air supply flow to the aerobic tank.
As a preferred technical scheme of the invention: according to a preset sludge discharge period, the following operations are periodically executed, and sludge discharge control is realized for the aerobic tank;
firstly, obtaining the ultrafiltration effluent flow of an aerobic tank and the ultrafiltration reflux flow of the aerobic tank, and calculating the single-cycle sludge discharge duration according to the obtained ultrafiltration effluent flow and the ultrafiltration reflux flow of the aerobic tank; and then carrying out sludge discharge according to the sludge discharge period and the single-period sludge discharge duration.
As a preferred technical scheme of the invention: according to the ultrafiltration effluent flow Q of the aerobic tankDischarging waterAnd the ultrafiltration reflux flow Q of the aerobic tankRefluxingIn combination with the period t of sludge dischargePeriod of timeAccording to the following formula:
calculating to obtain the sludge discharge time t under the single periodSludge discharge。
As a preferred technical scheme of the invention: in the step A1, COD concentration COD of the effluent of the regulating reservoir is obtainedCarbon sourceRegulating the concentration of ammonia nitrogen content in the effluent of the tank
Anaerobic tank effluent flow and anaerobic tank effluent COD concentration CODAnaerobic reactionThe concentration of the ammonia nitrogen content in the effluent of the anaerobic tank
And according to the following formula:
obtaining the carbon source supplement flow QCarbon source。
As a preferred technical scheme of the invention: in the step A2, according to the carbon source supplement flow rate QCarbon sourceControlling a flow regulating valve according to the following operation to realize the control of carbon source supplementing flow from the regulating tank to the aerobic tank;
the operation is as follows: obtaining actual carbon source supplement from flow regulating valveFlow rate QIn factAnd judging QPractice ofWhether or not it is greater than QCarbon sourceIf yes, reducing the opening of the flow regulating valve according to a first preset proportion; otherwise, the opening of the flow regulating valve is increased according to a first preset proportion.
As a preferred technical scheme of the invention: in the step B1, according to the COD concentration of the effluent of the anaerobic tankinAnd the ammonia nitrogen content concentration TN of the effluent of the anaerobic tankinAnd the water inlet flow Q of the anaerobic tankinAnd the actual carbon source supplement flow rate Q from the flow regulating valveincAccording to the following formula:
Qair (a)＝0.00467×η×[0.294×Qin×(CODin-800)+0.735×Qinc×(CODinc-800)]
+1.71(Qin×TNin+Qinc×TNinc)+337.6×(Qin+Qinc)
Obtaining aeration air supply flow QAir (a)Wherein eta represents a predetermined margin coefficient, CODincIndicates the COD concentration, TN, of the carbon source supplement influentincIndicating the ammonia nitrogen concentration of the carbon source supplementing inlet water.
As a preferred technical scheme of the invention: the step B2 comprises the following steps B2-1 to B2-6;
step B2-1, obtaining the output air quantity of the fan, and judging whether the output air quantity of the fan belongs to QAir (a)Keeping the working frequency of the fan if the fluctuation ratio is within the preset fluctuation ratio range; otherwise, entering the step B2-2;
step B2-2, if the output air quantity of the fan is lower than QAir (a)If the lower limit of the fluctuation proportion range is preset up and down, the step B2-3 is carried out; if the output air quantity of the fan is higher than QAir (a)If the upper limit of the fluctuation proportion range is preset up and down, the step B2-5 is carried out;
b2-3, controlling the working frequency of the fan to increase by a second preset proportion, delaying for a preset time, and then entering the step B2-4;
step B2-4, obtaining the output air quantity of the fan and judging whether the output air quantity of the fan is more than or equal to QAir (a)The lower limit of the fluctuation proportion range is preset up and down, if yes, the step is returnedStep B2-1; otherwise, returning to the step B2-3;
b2-5, controlling the working frequency of the fan to reduce a second preset proportion, delaying for a preset time, and then entering the step B2-6;
step B2-6, obtaining the output air quantity of the fan and judging whether the output air quantity of the fan is less than or equal to QAir (a)B, presetting an upper limit of the fluctuation proportion range, if so, returning to the step B2-1; otherwise, the step B2-5 is returned.
As a preferred technical scheme of the invention: when the output air quantity of the fan belongs to QAir (a)When the fluctuation ratio is within the range of the upper and lower preset fluctuation ratio, the aerobic pool is used for on-line dissolving the oxygen concentration DOacAs a reference value, the aeration air supply flow rate Q was laterally judged as followsAir (a)Whether it is sufficient;
the operation is as follows: when the aerobic tank is on-line dissolved oxygen concentration DOacLess than DO low control value DOlSending an abnormal signal, and after a preset time, if the aerobic tank has the online dissolved oxygen concentration DOacIs still less than the DO low control value DOlIf the preset time is reached, the DO low-level alarm is triggered;
meanwhile, if the aerobic tank is on-line dissolved oxygen concentration DOacGreater than the DO high control value DOhSending an abnormal signal, and after a preset time, if the aerobic tank has the online dissolved oxygen concentration DOacIs still greater than the DO high control value DOhAnd sending the abnormal signal again, and triggering DO high-level alarm if the abnormal signal is sent for a preset time.
Compared with the prior art, the leachate aerobic treatment control method adopting the technical scheme has the following technical effects:
the designed leachate aerobic treatment control method detects the quality and quantity of inlet water and outlet water in real time, realizes accurate addition according to the actual requirements of the quality and quantity of the water on carbon sources and control, avoids system fluctuation caused by factors such as personnel experience, personnel misoperation, personnel post change and the like, and reduces the influence of unqualified sewage discharge on enterprises and the environment; the total nitrogen of the effluent of the leachate aerobic system reaches the standard by detecting nitrogen elements in the inlet and outlet water of the aerobic tank and accurately calculating the addition amount of a carbon source under the dual standards of denitrification and decarburization; and the required air quantity can be accurately calculated through water quality, so that the aerobic system is ensured to be aerated as required without overexposure, and the energy consumption of the aerobic system can be greatly reduced.
Drawings
FIG. 1 is a schematic flow chart of the leachate aerobic treatment control method of the present invention;
FIG. 2 is a schematic flow chart of an embodiment of aeration control in the design of the present invention.
Detailed Description
The following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings.
Supplementing a carbon source, namely adding extra nutrients when degradable organic matters in the sewage are insufficient; dissolved oxygen, which represents the amount of molecular oxygen in the air dissolved in water; intelligent control of leachate, which means a full-automatic intelligent control system applied to a leachate aerobic system; accurate aeration, namely a surplus system summarized according to the actual oxygen demand of the aerobic tank and the operation experience, and realizing accurate air quantity output; the leachate refers to a high-concentration organic wastewater which is derived from water contained in garbage, rain, snow and other water entering a landfill and is formed through a garbage layer.
In practical application, based on the fact that the regulating tank is connected with the aerobic tank through the flow regulating valve and the fact that the anaerobic tank is directly connected with the aerobic tank, as shown in the figure 1, the control is carried out aiming at the flow regulating valve according to the following steps A1 to A2, and the control of the carbon source supplement flow rate from the regulating tank to the aerobic tank is realized.
Step A1, obtaining COD concentration COD of effluent of a regulating reservoirCarbon sourceRegulating the concentration of ammonia nitrogen content in the effluent of the tank
Anaerobic tank effluent flow and anaerobic tank effluent COD concentration CODAnaerobic reactionThe concentration of the ammonia nitrogen content in the effluent of the anaerobic tank
And according to the following formula:
obtaining the carbon source supplement flow QCarbon sourceThen proceed to step a2.
Step A2. supplement of flow Q according to carbon sourceCarbon sourceAnd controlling a flow regulating valve according to the following operation to realize the control of the carbon source supplement flow of the regulating tank to the aerobic tank.
The operation is as follows: obtaining the actual carbon source supplement flow Q from the flow regulating valvePractice ofAnd judging QPractice ofWhether or not it is greater than QCarbon sourceIf yes, reducing the opening degree of the flow regulating valve 301-MV-004 according to a first preset proportion, such as 5% opening degree; otherwise, the opening of the flow regulating valve 301-MV-004 is increased by a first preset proportion, such as 5% opening.
Meanwhile, as shown in fig. 1, the aeration control to the aerobic tank is realized as the following steps B1 to B2.
Step B1, according to the COD concentration of the effluent of the anaerobic tankinAnd the ammonia nitrogen content concentration TN of the effluent of the anaerobic tankinAnd the water inlet flow Q of the anaerobic tankinAnd the actual carbon source supplement flow rate Q from the flow regulating valveincAccording to the following formula:
Qair (a)＝0.00467×η×[0.294×Qin×(CODin-800)+0.735×Qinc×(CODinc-800)]
+1.71(Qin×TNin+Qinc×TNinc)+337.6×(Qin+Qinc)
Obtaining aeration air supply flow QAir (a)Then, the process proceeds to step B2, where η represents a predetermined margin coefficient, CODincIndicates the COD concentration, TN, of the carbon source supplement influentincIndicating the ammonia nitrogen concentration of the carbon source supplementing inlet water.
And B2, controlling a fan according to the aeration air supply flow, and adjusting the actual aeration air supply flow to the aerobic tank.
In practice, the step B2 specifically executes the following steps B2-1 to B2-6.
Step B2-1, obtaining the output air quantity of the fan, and judging whether the output air quantity of the fan belongs to QAir (a)Keeping the working frequency of the fan if the fluctuation ratio is within the preset fluctuation ratio range; otherwise, go to step B2-2.
Step B2-2, if the output air quantity of the fan is lower than QAir (a)If the lower limit of the fluctuation proportion range is preset up and down, the step B2-3 is carried out; if the output air quantity of the fan is higher than QAir (a)And C, entering the step B2-5 if the upper limit of the fluctuation ratio range is preset up and down.
And B2-3, controlling the working frequency of the fan to increase by a second preset proportion, delaying for a preset time, and then entering the step B2-4.
Step B2-4, obtaining the output air quantity of the fan and judging whether the output air quantity of the fan is more than or equal to QAir (W)B, presetting a lower limit of the fluctuation proportion range, if so, returning to the step B2-1; otherwise, the step B2-3 is returned.
And B2-5, controlling the working frequency of the fan to reduce by a second preset proportion, delaying for a preset time, and then entering the step B2-6.
Step B2-6, obtaining the output air quantity of the fan and judging whether the output air quantity of the fan is less than or equal to QAir (a)B, presetting an upper limit of the fluctuation proportion range, if so, returning to the step B2-1; otherwise, the step B2-5 is returned.
In connection with aeration control as described above, in a practical embodiment application, such as shown in fig. 2, aeration control is implemented.
Meanwhile, in practical application, when the output air quantity of the fan belongs to QAir (a)When the fluctuation ratio is within the range of the preset fluctuation ratio, the aerobic tank is used for on-line dissolving oxygen concentration DOacAs a reference value, the aeration air supply flow rate Q was laterally judged as followsAir (a)Or not sufficient.
The operation is as follows: when the aerobic tank is on-line dissolved oxygen concentration DOacLess than DO low control value DOlSending out abnormal signal and waiting for preset time lengthThen, if the aerobic tank is on-line dissolved oxygen concentration DOacIs still less than the DO low control value DOlAnd sending the abnormal signal again, and triggering DO low-level alarm if the abnormal signal is sent for a preset time.
Meanwhile, if the aerobic tank is on-line dissolved oxygen concentration DOacGreater than the DO high control value DOhSending an abnormal signal, and after a preset time, if the aerobic tank has the online dissolved oxygen concentration DOacIs still greater than the DO high control value DOhAnd sending the abnormal signal again, and triggering DO high-level alarm if the abnormal signal is sent for a preset time.
In the practical application of aeration control, the attributes of the parameters are shown in the following table 1:
TABLE 1
Moreover, the invention further designs a preset sludge discharge period, as shown in fig. 1, the following operation is executed in the period, and sludge discharge control is realized for the aerobic tank.
The operation is as follows: firstly, obtaining the ultrafiltration effluent flow Q of the aerobic tankDischarging waterAnd the ultrafiltration reflux flow Q of the aerobic tankRefluxingIn combination with the period t of sludge dischargePeriod of timeAccording to the following formula:
calculating to obtain the sludge discharge time t under the single periodSludge discharge(ii) a And then carrying out sludge discharge according to the sludge discharge period and the single-period sludge discharge duration.
The leachate aerobic treatment control method designed by the technical scheme detects the quality and quantity of inlet water and outlet water in real time, realizes accurate feeding according to the actual requirements of the quality and quantity of water on carbon sources and control, avoids system fluctuation caused by factors such as personnel experience, personnel misoperation, personnel post change and the like, and reduces the influence of unqualified sewage discharge on enterprises and environment; the total nitrogen of the effluent of the leachate aerobic system reaches the standard by detecting nitrogen elements in the inlet and outlet water of the aerobic tank and accurately calculating the addition amount of a carbon source under the dual standards of denitrification and decarburization; and the required air quantity can be accurately calculated through water quality, so that the aerobic system is ensured to be aerated as required without overexposure, and the energy consumption of the aerobic system can be greatly reduced.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (8)
1. A leachate aerobic treatment control method is characterized by comprising the following steps: based on the fact that the regulating reservoir is connected with the aerobic reservoir through the flow regulating valve, and the anaerobic reservoir is directly connected with the aerobic reservoir, the control is carried out aiming at the flow regulating valve according to the following steps A1 to A2, so that the control of the carbon source supplement flow of the regulating reservoir to the aerobic reservoir is realized;
step A1, obtaining the COD concentration of the effluent of the regulating reservoir, the ammonia nitrogen content concentration of the effluent of the regulating reservoir, the effluent flow of the anaerobic reservoir, the COD concentration of the effluent of the anaerobic reservoir and the ammonia nitrogen content concentration of the effluent of the anaerobic reservoir, calculating to obtain a carbon source supplement flow according to the COD concentration and the ammonia nitrogen content concentration, and then entering step A2;
step A2, controlling a flow regulating valve according to the carbon source supplement flow to realize the control of the carbon source supplement flow from the regulating tank to the aerobic tank;
simultaneously realizing aeration control to the aerobic tank according to the following steps B1 to B2;
b1, obtaining COD concentration of the effluent of the anaerobic tank, ammonia nitrogen content concentration of the effluent of the anaerobic tank, inflow rate of the anaerobic tank and actual carbon source supplement flow from a flow regulating valve, calculating to obtain aeration gas supply flow according to the actual carbon source supplement flow, and then entering step B2;
and B2, controlling a fan according to the aeration air supply flow, and adjusting the actual aeration air supply flow to the aerobic tank.
2. The aerobic treatment control method for percolate according to claim 1, characterized in that: according to a preset sludge discharge period, the following operations are periodically executed, and sludge discharge control is realized for the aerobic tank;
firstly, obtaining the ultrafiltration effluent flow of an aerobic tank and the ultrafiltration reflux flow of the aerobic tank, and calculating the single-period sludge discharge duration according to the obtained ultrafiltration effluent flow and the ultrafiltration reflux flow of the aerobic tank; and then carrying out sludge discharge according to a sludge discharge period and a single-period sludge discharge duration.
3. The aerobic treatment control method for percolate according to claim 2, characterized in that: according to the ultrafiltration effluent flow Q of the aerobic tankDischarging waterAnd the ultrafiltration reflux flow Q of the aerobic tankRefluxingIn combination with the mud discharge period tPeriod of timeAccording to the following formula:
calculating to obtain the sludge discharge time t under the single periodSludge discharge。
4. The aerobic treatment control method for percolate according to claim 1, characterized in that: in the step A1, the COD concentration COD of the effluent of the regulating reservoir is obtainedCarbon sourceRegulating the concentration of ammonia nitrogen content in the effluent of the tank
Anaerobic tank effluent flow and anaerobic tank effluent COD concentration CODAnaerobic reactionAnd the concentration of ammonia nitrogen content in the effluent of the anaerobic tank
And according to the following formula:
obtaining the carbon source supplement flow QCarbon source。
5. The aerobic treatment control method for leachate according to claim 1, wherein: in the step A2, the flow rate Q is supplemented according to the carbon sourceCarbon sourceControlling a flow regulating valve according to the following operation to realize the control of the carbon source supplement flow of the regulating tank to the aerobic tank;
the operation is as follows: obtaining the actual carbon source supplement flow Q from the flow regulating valvePractice ofAnd determining QPractice ofWhether or not it is greater than QCarbon sourceIf so, reducing the opening of the flow regulating valve according to a first preset proportion; otherwise, the opening of the flow regulating valve is increased according to a first preset proportion.
6. The aerobic treatment control method for leachate according to claim 1, wherein: in the step B1, according to the COD concentration COD of the effluent of the anaerobic tankinAnd the ammonia nitrogen content concentration TN of the effluent of the anaerobic tankinAnd the water inlet flow Q of the anaerobic tankinAnd the actual carbon source supplement flow rate Q from the flow regulating valveincAccording to the following formula:
Qair (a)＝0.00467×η×[0.294×Qin×(CODin-800)+0.735×Qinc×(CODinc-800)]+1.71(Qin×TNin+Qinc×TNinc)+337.6×(Qin+Qinc)
Obtaining aeration air supply flow QAir (a)Wherein eta represents a predetermined margin coefficient, CODincIndicates the COD concentration, TN, of the carbon source supplement influentincIndicating the ammonia nitrogen concentration of the carbon source supplementing inlet water.
7. The aerobic treatment control method for percolate according to claim 1, characterized in that: the step B2 comprises the following steps B2-1 to B2-6;
step B2-1, obtaining the output air quantity of the fan, and judging whether the output air quantity of the fan belongs to QAir (a)Within the range of the up-down preset fluctuation ratioIf yes, keeping the working frequency of the fan; otherwise, entering step B2-2;
step B2-2, if the output air quantity of the fan is lower than QAir (a)If the lower limit of the fluctuation proportion range is preset up and down, the step B2-3 is carried out; if the output air quantity of the fan is higher than QAir (a)If the upper limit of the fluctuation proportion range is preset up and down, the step B2-5 is carried out;
b2-3, controlling the working frequency of the fan to increase a second preset proportion, delaying for a preset time, and then entering the step B2-4;
step B2-4, obtaining the output air quantity of the fan and judging whether the output air quantity of the fan is more than or equal to QAir (W)B, presetting a lower limit of the fluctuation proportion range, if so, returning to the step B2-1; otherwise, returning to the step B2-3;
b2-5, controlling the working frequency of the fan to reduce by a second preset proportion, delaying for a preset time, and then entering the step B2-6;
step B2-6, obtaining the output air quantity of the fan and judging whether the output air quantity of the fan is less than or equal to QAir (a)B, presetting an upper limit of the fluctuation proportion range, if so, returning to the step B2-1; otherwise, the step B2-5 is returned.
8. The aerobic treatment control method for percolate according to claim 7, characterized in that: when the output air quantity of the fan belongs to QAir (a)When the fluctuation ratio is within the range of the preset fluctuation ratio, the aerobic tank is used for on-line dissolving oxygen concentration DOacAs a reference value, the aeration air supply flow rate Q was laterally judged as followsAir (a)Whether it is sufficient;
the operation is as follows: when the aerobic tank is on-line dissolved oxygen concentration DOacLess than DO low control value DOlSending an abnormal signal, and after a preset time, if the aerobic tank has the online dissolved oxygen concentration DOacIs still less than the DO low control value DOlIf the preset time is reached, the DO low-level alarm is triggered;
meanwhile, if the aerobic tank is on-line dissolved oxygen concentration DOacGreater than the DO high control value DOhSending an abnormal signal, and after a preset time length, if the aerobic tank is on lineDissolved oxygen concentration DOacIs still greater than the DO high control value DOhAnd sending the abnormal signal again, and triggering DO high-level alarm if the abnormal signal is sent for a preset time.
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