CN110862141A - Dissolved oxygen adaptive control device and method thereof - Google Patents
Dissolved oxygen adaptive control device and method thereof Download PDFInfo
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- CN110862141A CN110862141A CN201911258935.9A CN201911258935A CN110862141A CN 110862141 A CN110862141 A CN 110862141A CN 201911258935 A CN201911258935 A CN 201911258935A CN 110862141 A CN110862141 A CN 110862141A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 164
- 239000001301 oxygen Substances 0.000 title claims abstract description 164
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 19
- 238000005273 aeration Methods 0.000 claims abstract description 276
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 239000007789 gas Substances 0.000 claims abstract description 86
- 230000001105 regulatory effect Effects 0.000 claims abstract description 72
- 239000010802 sludge Substances 0.000 claims abstract description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 238000004364 calculation method Methods 0.000 claims description 10
- 229910002651 NO3 Inorganic materials 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 239000010865 sewage Substances 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000002354 daily effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007619 statistical method 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
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
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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
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
- C02F3/1284—Mixing devices
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- 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]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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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
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Abstract
The invention belongs to the technical field of sewage treatment, and relates to a dissolved oxygen self-adaptive control device and a dissolved oxygen self-adaptive control method. The dissolved oxygen adaptive control device comprises: the non-aeration device, the first aeration device, the second aeration device, the blower control system and the overall control system are sequentially connected in series; the non-aeration device comprises a non-aeration tank and a water inlet flow meter arranged on a water inlet pipeline of the non-aeration tank; the first aeration device comprises a first aeration tank, a first gas flowmeter and a manual gas flow regulating valve; the second aeration device comprises a second aeration tank, a second gas flowmeter, a first gas quantity electric regulating valve, a first online dissolved oxygen meter and an online sludge concentration meter; the blower control system comprises a blower and a master control system; the water inlet flow meter, the first gas flow meter, the second gas flow meter, the first gas electric regulating valve, the first online dissolved oxygen meter, the online sludge concentration meter and the blower controller are respectively in signal connection with the master control system. The dissolved oxygen adaptive control device has high stability.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a dissolved oxygen self-adaptive control device and a dissolved oxygen self-adaptive control method.
Background
Dissolved oxygen is an important index for controlling the operation of the sewage denitrification and dephosphorization process. A sewage treatment plant usually adopts a control system to realize the standard operation of a sewage denitrification and dephosphorization process system. The control systems completely rely on the detection of an online monitoring instrument, and the accuracy of the detection result is completely controlled by the reliability of the online monitoring instrument. However, the price of the current online monitoring instrument is high, and the monitoring, maintenance and management are complex, so that the investment cost and the daily maintenance cost for directly utilizing the online monitoring instrument to control the dissolved oxygen are obviously increased. And once the dissolved oxygen meters in the control systems are not maintained timely, the dissolved oxygen control systems of the corresponding units cannot work normally, and the stability of other units is influenced. The popularization and application of the dissolved oxygen control system are greatly influenced by high investment and operation cost and unstable system operation.
Therefore, the existing dissolved oxygen control system for sewage treatment needs to be improved, so that the investment and operation cost are both considered, the reliability of dissolved oxygen control is improved, and efficient nitrogen and phosphorus removal of a sewage plant is realized.
Disclosure of Invention
The invention aims to provide a dissolved oxygen self-adaptive control device and a method thereof, which mainly depend on a signal of a water inlet flow meter with high reliability and is assisted by a signal of an online dissolved oxygen meter with low reliability and a signal of a sludge concentration meter, so that the stability of the dissolved oxygen self-adaptive control device is improved.
In order to achieve the above object, a first aspect of the present invention provides a dissolved oxygen adaptive control apparatus, comprising: the system comprises a non-aeration device, a first aeration device, a second aeration device, a blower control system and a master control system;
the non-aeration device comprises a non-aeration tank and a water inlet flow meter arranged on a water inlet pipeline of the non-aeration tank;
the first aeration device comprises a first aeration tank, a first gas flowmeter and a manual gas quantity regulating valve, wherein the first gas flowmeter and the manual gas quantity regulating valve are arranged on a gas inlet pipeline of the first aeration tank;
the second aeration device comprises a second aeration tank, a second gas flow meter and a first gas quantity electric regulating valve which are arranged on an air inlet pipeline of the second aeration tank, and a first online dissolved oxygen meter and an online sludge concentration meter which are arranged in the second aeration tank;
the non-aeration tank, the first aeration tank and the second aeration tank are sequentially communicated in series;
the blower control system comprises a blower and a blower controller;
the water inlet flow meter, the first gas flow meter, the second gas flow meter, the first gas quantity electric regulating valve, the first online dissolved oxygen meter, the online sludge concentration meter and the blower controller are respectively in signal connection with the master control system.
In one embodiment of the present invention, the apparatus further comprises: the third aeration device comprises a third aeration tank, a third gas flow meter and a second gas quantity electric regulating valve which are arranged on an air inlet pipeline of the third aeration tank, and a second online dissolved oxygen meter arranged in the third aeration tank;
the non-aeration tank, the first aeration tank, the third aeration tank and the second aeration tank are sequentially communicated in series;
and the third gas flowmeter, the second gas quantity electric regulating valve and the second online dissolved oxygen meter are respectively in signal connection with the master control system.
During the operation of the dissolved oxygen adaptive control device, the opening degrees of the gas quantity electric regulating valves, such as the first gas quantity electric regulating valve and the second gas quantity electric regulating valve, are respectively 20-80%.
In one embodiment of the present invention, the non-aeration tank, the first aeration tank and the second aeration tank are integrated and separated by a partition.
In one embodiment of the present invention, the non-aeration tank, the first aeration tank, the third aeration tank and the second aeration tank are integrated and separated by a partition.
In a second aspect, the present invention provides a dissolved oxygen adaptive control method, which is performed in the above apparatus, the method comprising the steps of:
s1, obtaining the water quality of inlet water in the non-aeration tank, and calculating the oxygen demand O of the inlet water according to the water quality of the inlet water and the preset water quality of outlet water2；
S2, the master control system calculates the water quantity lag time T1 corresponding to the current moment;
s3, the master control system acquires a signal Q (t) of an inflow water flowmeter and a signal MLSS (t) of an online sludge concentration meter;
s4, setting a target dissolved oxygen value C2 of the second aeration tank;
s5, the master control system is based on the oxygen demand O2Acquiring a required aeration amount G2 of the second aeration tank through a target dissolved oxygen value C2 of the second aeration tank, a signal Q (t) of the water inlet flow meter and a signal MLSS (t) of an online sludge concentration meter;
s6, the master control system acquires a signal G1 of the first gas flowmeter, and calculates the air supply quantity G required by the blower according to the aeration quantity G2 required by the second aeration tank, wherein G is G1+ G2;
s7, according to the air supply quantity G, the master control system obtains the flow of a second gas flowmeter at the time of the water quantity lag time T1 corresponding to the current moment, and calculates the difference value between the flow of the second gas flowmeter and the aeration quantity G2 required by the second aeration tank; if the difference value is within a preset first error threshold value range, the opening degree of the first air quantity electric regulating valve is not regulated; otherwise, the opening degree of the first air quantity electric regulating valve is regulated, so that the difference value is within a preset first error threshold value range;
s8, the master control system acquires a signal DO2 of a first online dissolved oxygen instrument, and calculates the difference value between the signal DO2 of the first online dissolved oxygen instrument and the target dissolved oxygen value C2 of the second aeration tank; if the difference value is within a first preset value range, keeping the aeration quantity G2 of the second aeration tank constant; and otherwise, adjusting the required aeration G2 of the second aeration tank so that the difference value is within a first preset value range.
In step S1, one skilled in the art can detect the quality of the influent water, such as the BOD of the influent water and the total nitrogen concentration of the influent water, by manually sampling the non-aeration tank influent water for 24 hours. And inputting the detected 24 groups of data in the master control system.
Specifically, in step S4, the target dissolved oxygen value C2 of the second aeration tank and the target dissolved oxygen value C3 of the third aeration tank are set;
step S5 is that the general control system bases on the oxygen demand O2Acquiring a required aeration amount G2 of the second aeration tank and a required aeration amount G3 of the third aeration tank from a target dissolved oxygen value C2 of the second aeration tank, a target dissolved oxygen value C3 of the third aeration tank, a signal Q (t) of the water inlet flow meter and a signal MLSS (t) of an online sludge concentration meter;
step S6 is that the general control system acquires a signal G1 of the first gas flow meter, and calculates a required air supply amount G of the blower according to the required aeration amount G2 of the second aeration tank and the required aeration amount G3 of the third aeration tank, where G is G1+ G2+ G3;
step S7 is that, according to the air supply demand G, the master control system obtains the flow rate of the second gas flow meter and the flow rate of the third gas flow meter at the time of the water quantity lag time T1 corresponding to the current time, and calculates the difference Δ G2 between the flow rate of the second gas flow meter and the air supply demand G2 of the second aeration tank; if the difference value is within a preset first error threshold value range, keeping the opening degree of the first air quantity electric regulating valve; otherwise, the opening degree of the first air quantity electric regulating valve is regulated, so that the difference value is within a preset first error threshold value range; calculating a difference value AG 3 between the flow rate of the third gas flowmeter and the required aeration G3 of the third aeration tank; if the difference value is within the range of a preset second error threshold value, keeping the opening degree of the second air quantity electric regulating valve; otherwise, adjusting the opening degree of the second air quantity electric adjusting valve to enable the difference value to be within a preset second error threshold value range;
s8, the master control system acquires a signal DO2 of a first online dissolved oxygen meter and a signal DO3 of a second online dissolved oxygen meter, and calculates a difference value delta DO2 between a signal DO2 of the first online dissolved oxygen meter and a target dissolved oxygen value C2 of the second aeration tank; if the difference value is within a first preset value range, keeping the aeration quantity G2 of the second aeration tank constant; otherwise, adjusting the required aeration G2 of the second aeration tank to make the difference within a first preset value range; calculating the difference value delta DO3 between the signal DO3 of the second online dissolved oxygen meter and the target dissolved oxygen value C3 of the third aeration tank, and if the difference value is within a second preset value range, keeping the required aeration quantity G3 of the third aeration tank unchanged; and otherwise, adjusting the required aeration G3 of the third aeration tank so that the difference value is within a second preset value range.
The first error threshold, the second error threshold, the first preset value and the second preset value can be set by a person skilled in the art according to practical operation experience, and the present invention is not limited in particular. By way of example only, n% G2 ≦ first error threshold ≦ n% G2, 0 < n ≦ 3; -n% G3 ≦ a second error threshold ≦ n% G3, n ≦ 3> 0; -1mg/L is less than or equal to 1 mg/L; the second preset value is less than or equal to 1mg/L and less than or equal to 1 mg/L.
It should be noted that, the gas regulating valve control principle: (1) the opening degree of the first air quantity electric regulating valve and the second air quantity electric regulating valve is ensured to be 20-80% in the operation process; (2) the opening of the air quantity manual regulating valve is regulated to the maximum; (3) the first air quantity electric regulating valve is regulated firstly, the second air quantity electric regulating valve is regulated after the requirements are met, and the opening degree of the residual air quantity regulating valve is kept unchanged no matter which air quantity electric regulating valve is in operation.
Specifically, in step S1, the quality of the intake water includes: BOD of the influent water and total nitrogen concentration of the influent water; the preset effluent quality comprises: the method comprises the following steps of (1) presetting BOD of effluent, total nitrogen concentration of effluent and nitrate concentration of effluent;
the oxygen demand O2The calculation formula of (2) is as follows:
wherein, the average flow rate of the Q-online flowmeter is 1 hour before;
So-BOD concentration of influent water, mg/L;
Se-BOD concentration of effluent, mg/L;
PX-excess sludge discharge, kg/d;
Nt-total kjeldahl nitrogen of the feed water, mg/L;
Nte-total kjeldahl nitrogen of the effluent, mg/L;
NOe-nitrate in water, mg/L.
Specifically, the calculation formula of the water amount lag time T1 corresponding to the current time is as follows:
wherein m is a volume coefficient;
n-the number of primary sedimentation tanks;
p-number of biological pools;
VCCvolume of primary sedimentation tank, m3；
VFY-biological pond volume, m3；
Q-average flow 1 hour before, m3/s；
VINF-a flow coefficient;
qr-external reflux amount, m3/s；
Qir-internal reflux, m3/s。
Specifically, the calculation formula of the aeration amount G2 of the second aeration tank is as follows:
wherein, MLSS-biological pond sludge concentration, mg/L;
cs (T) -saturation of oxygen at T temperature, mg/L, under atmospheric pressure conditions;
t-temperature, DEG C;
c2-target dissolved oxygen value of the second aeration tank, mg/L;
k-coefficient of variation, range 160 and 180.
Specifically, the calculation formula of the aeration amount G3 of the third aeration tank is as follows:
wherein, MLSS-biological pond sludge concentration, mg/L;
cs (T) -saturation of oxygen at T temperature, mg/L, under atmospheric pressure conditions;
t-temperature, DEG C;
c3-target dissolved oxygen value of the third aeration tank, mg/L;
k-coefficient of variation, range 160 and 180.
Specifically, the method further comprises: s0., starting a master control system, and setting the adjusting ranges of the first air quantity electric adjusting valve and the second air quantity electric adjusting valve; setting a change threshold for the first gas flow meter, the second gas flow meter, the third gas flow meter, the first online dissolved oxygen meter, the second online dissolved oxygen meter, and the online sludge concentration meter; assigning a replacement value within a respective one of the variation threshold ranges if the signals of the first online dissolved oxygen meter, the second online dissolved oxygen meter, and the online sludge concentration meter are not within the respective variation threshold range.
The dissolved oxygen self-adaptive control device provided by the invention mainly depends on the signal of the water inlet flow meter with high reliability, and is assisted by the signal of the online dissolved oxygen meter with low reliability and the signal of the sludge concentration meter, so that the stability of the dissolved oxygen self-adaptive control device is improved.
The dissolved oxygen self-adaptive control device provided by the invention can still realize stable control on the dissolved oxygen self-adaptive control device by virtue of the water inlet flow meter, the online model compensation and the master control system under the condition that the online dissolved oxygen meter fails.
The dissolved oxygen self-adaptive control device provided by the invention has the characteristics of stability, reliability, timely adjustment, simplicity in maintenance, low investment and good adjustment effect.
The dissolved oxygen self-adaptive control method provided by the invention mainly depends on the signal of the water inlet flow meter with high reliability and the quality of inlet water, and is assisted by the signal of the online dissolved oxygen meter with low reliability and the signal of the sludge concentration meter, so that the dissolved oxygen concentration of the aeration tank is stably controlled within +/-20% of a set value, and the stable operation of the sewage denitrification and dephosphorization process is effectively ensured. The reliability is improved by at least 50% relative to methods that rely entirely on signal control of an online dissolved oxygen meter.
The dissolved oxygen self-adaptive control method provided by the invention has the characteristics of stability, reliability, timely adjustment, simplicity in maintenance, low investment and good adjustment effect.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
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 throughout.
Fig. 1 shows a schematic diagram of a dissolved oxygen adaptive control device provided by the invention.
Fig. 2 is a schematic diagram of another dissolved oxygen adaptive control device provided by the invention.
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.
Example 1
The present embodiment provides a dissolved oxygen adaptive control device. Referring to fig. 1, fig. 1 is a schematic diagram illustrating a dissolved oxygen adaptive control device according to the present invention. As shown in fig. 1, the dissolved oxygen adaptive control device includes: the system comprises a non-aeration device 1, a first aeration device 2, a second aeration device 3, a blower control system 4 and a master control system 5; the non-aeration device 1 comprises a non-aeration tank 101 and a water inlet flow meter 102 arranged on a water inlet pipeline of the non-aeration tank 101; the first aeration device 2 comprises a first aeration tank 201, and a first gas flow meter 202 and a manual air quantity regulating valve 203 which are arranged on an air inlet pipeline of the first aeration tank 201; the second aeration apparatus 3 comprises a second aeration tank 301, a second gas flow meter 302 and a first gas amount electric regulating valve 303 which are arranged on an air inlet pipeline of the second aeration tank 301, and a first online dissolved oxygen meter 304 and an online sludge concentration meter 305 which are arranged in the second aeration tank 301; the non-aeration tank 101, the first aeration tank 201 and the second aeration tank 301 are sequentially communicated in series; the blower control system 4 includes a blower 401 and a blower controller 402; the water inlet flow meter 102, the first gas flow meter 202, the second gas flow meter 302, the first gas electric regulating valve 303, the first online dissolved oxygen meter 304, the online sludge concentration meter 305, and the blower controller 402 are respectively in signal connection with the overall control system 5.
The dissolved oxygen self-adaptive control device provided by the invention has the advantages that on the basis of knowing the water quality entering the non-aeration tank 101, a master control system can control a blower controller 402 to adjust the air volume of a blower 401 and adjust the opening degree of a first air volume electric regulating valve 303 according to the water inflow of the non-aeration tank 101 measured by a water inflow meter 102, the aeration amount of a first aeration device 2 measured by a first air flow meter 202, the aeration amount of a second aeration tank 301 measured by a second air flow meter 302 and the dissolved oxygen concentration and sludge concentration of the second aeration tank 301 respectively measured by a first online dissolved oxygen meter 304 and an online sludge concentration meter 305, so that the dissolved oxygen level of the aeration tank is maintained in a set range, and the sewage is efficiently and stably treated.
Example 2
The present embodiment provides a dissolved oxygen adaptive control device. Referring to fig. 2, fig. 2 is a schematic diagram of another adaptive control device for dissolved oxygen according to the present invention. As shown in fig. 2, the dissolved oxygen adaptive control device includes: the system comprises a non-aeration device 1, a first aeration device 2, a third aeration device 5, a second aeration device 3, a blower control system 4 and a master control system 5; the non-aeration device 1 comprises a non-aeration tank 101 and a water inlet flow meter 102 arranged on a water inlet pipeline of the non-aeration tank 101; the first aeration device 2 comprises a first aeration tank 201, and a first gas flow meter 202 and a manual air quantity regulating valve 203 which are arranged on an air inlet pipeline of the first aeration tank 201; the third aeration device 5 comprises a third aeration tank 501, a third gas flow meter 502 and a second gas quantity electric regulating valve 503 which are arranged on an air inlet pipeline of the third aeration tank 501, and a second online dissolved oxygen meter 504 which is arranged in the third aeration tank 501; the second aeration apparatus 3 comprises a second aeration tank 301, a second gas flow meter 302 and a first gas amount electric regulating valve 303 which are arranged on an air inlet pipeline of the second aeration tank 301, and a first online dissolved oxygen meter 304 and an online sludge concentration meter 305 which are arranged in the second aeration tank 301; the non-aeration tank 101, the first aeration tank 201, the third aeration tank 501 and the second aeration tank 301 are sequentially connected in series; the blower control system 4 includes a blower 401 and a blower controller 402; the water inlet flow meter 102, the first gas flow meter 202, the third gas flow meter 502, the second gas quantity electric regulating valve 503, the second online dissolved oxygen meter 504, the second gas flow meter 302, the first gas quantity electric regulating valve 303, the first online dissolved oxygen meter 304, the online sludge concentration meter 305, and the blower controller 402 are respectively in signal connection with the overall control system 5.
Example 3
The embodiment provides a dissolved oxygen self-adaptive control method. Referring to fig. 1, the method is carried out in the apparatus of example 1, and comprises the following steps:
s1, acquiring BOD and total nitrogen concentration of inlet water in the non-aeration tank 101, and calculating oxygen demand O of the inlet water according to the BOD and total nitrogen concentration of the inlet water, BOD of preset outlet water, total nitrogen concentration of preset outlet water and nitrate concentration of preset outlet water2。
S2, the master control system 5 calculates the water quantity lag time T1 corresponding to the current moment.
And S3, the master control system 5 acquires a signal Q (t) of the water inflow flowmeter 102 and a signal MLSS (t) of the online sludge concentration meter 305.
And S4, setting a target dissolved oxygen value C2 of the second aeration tank 301.
S5, the master control system 5 is based on the oxygen demand O2The target dissolved oxygen value C2 of the second aeration tank 301, the signal q (t) of the inflow flowmeter 102, and the signal mlss (t) of the on-line sludge concentration meter 305 obtain the required aeration amount G2 of the second aeration tank 301.
S6, the general control system 5 acquires a signal G1 of the first gas flowmeter 202, and calculates the air supply demand G of the blower 401 according to the air supply demand G2 of the second aeration tank 301, wherein G is G1+ G2.
S7, according to the air supply quantity G, the master control system 5 obtains the flow of the second gas flow meter 302 at the water quantity lag time T1 corresponding to the current moment, and calculates the difference value delta G2 between the flow of the second gas flow meter 302 and the aeration quantity G2 required by the second aeration tank 301; if the difference value is within a preset first error threshold value range, the opening degree of the first air quantity electric regulating valve 303 is kept; otherwise, the opening degree of the first air quantity electric regulating valve 303 is regulated, so that the difference value is within a preset first error threshold value range.
S8, the general control system 5 acquires a signal DO2 of a first online dissolved oxygen instrument 304, and calculates a difference value delta DO2 between a signal DO2 of the first online dissolved oxygen instrument 304 and a target dissolved oxygen value C2 of the second aeration tank 301; if the difference value is within the first preset value range, keeping the aeration quantity G2 of the second aeration tank 301 unchanged; otherwise, the required aeration amount G2 of the second aeration tank 301 is adjusted so that the difference is within the first preset value range.
Example 4
The embodiment provides a dissolved oxygen self-adaptive control method. Referring to fig. 2, the method is carried out in the apparatus of example 2, and comprises the following steps:
s1, acquiring BOD and total nitrogen concentration of inlet water in the non-aeration tank 101, and calculating oxygen demand O of the inlet water according to the BOD and total nitrogen concentration of the inlet water, BOD of preset outlet water, total nitrogen concentration of preset outlet water and nitrate concentration of preset outlet water2. The oxygen demand O2The calculation formula of (2) is as follows:
wherein, the average flow rate of the Q-online flowmeter is 1 hour before;
So-BOD concentration of influent water, mg/L;
Se-BOD concentration of effluent, mg/L;
PX-excess sludge discharge, kg/d;
Nt-total kjeldahl nitrogen of the feed water, mg/L;
Nte-total kjeldahl nitrogen of effluent，mg/L；
NOe-nitrate in water, mg/L.
S2, the master control system 5 calculates the water quantity lag time T1 corresponding to the current moment. The calculation formula of the water amount lag time T1 corresponding to the current time is as follows:
wherein m is a volume coefficient;
n-the number of primary sedimentation tanks;
p-number of biological pools;
VCCvolume of primary sedimentation tank, m3；
VFY-biological pond volume, m3；
Q-average flow 1 hour before, m3/s；
VINF-a flow coefficient;
qr-external reflux amount, m3/s；
Qir-internal reflux, m3/s。
And S3, the master control system 5 acquires a signal Q (t) of the water inflow flowmeter 102 and a signal MLSS (t) of the online sludge concentration meter 305.
S4, setting a target dissolved oxygen value C2 of the second aeration tank 301 and a target dissolved oxygen value C3 of the third aeration tank 501.
S5, the master control system 5 is based on the oxygen demand O2The target dissolved oxygen value C2 of the second aeration tank 301, the target dissolved oxygen value C3 of the third aeration tank 501, the signal q (t) of the influent flow meter 102, and the signal mlss (t) of the on-line sludge concentration meter 305 obtain the aeration demand G2 of the second aeration tank 301 and the aeration demand G3 of the third aeration tank 501. The calculation formula of the aeration amount G2 required by the second aeration tank 301 is:
wherein, MLSS-biological pond sludge concentration, mg/L;
cs (T) -saturation of oxygen at T temperature, mg/L, under atmospheric pressure conditions;
t-temperature, DEG C;
c2-target dissolved oxygen value, mg/L, of the second aeration tank 301;
k-change coefficient, value range 160-180;
the calculation formula of the aeration amount G3 required by the third aeration tank 501 is:
wherein, MLSS-biological pond sludge concentration, mg/L;
cs (T) -saturation of oxygen at T temperature, mg/L, under atmospheric pressure conditions;
t-temperature, DEG C;
c3-target dissolved oxygen value, mg/L, of the third aeration tank 501;
k-coefficient of variation, range 160 and 180.
S6, the general control system 5 acquires a signal G1 of the first gas flow meter 202, and calculates the air supply demand G of the blower 401 according to the air supply demand G2 of the second aeration tank 301 and the air supply demand G3 of the third aeration tank 501, wherein G is G1+ G2+ G3.
S7, according to the air supply quantity G, the master control system 5 obtains the flow of the second gas flow meter 302 and the flow of the third gas flow meter 502 when the water quantity lag time T1 corresponds to the current moment, and calculates the difference value delta G2 between the flow of the second gas flow meter 302 and the air quantity G2 required by the second aeration tank 301; if the difference value is within a preset first error threshold value range, the opening degree of the first air quantity electric regulating valve 303 is kept; otherwise, the opening degree of the first air quantity electric regulating valve 303 is regulated, so that the difference value is within a preset first error threshold value range; calculating the difference value AG 3 between the flow rate of the third gas flowmeter 502 and the required aeration G3 of the third aeration tank 501; if the difference value is within the preset second error threshold value range, the opening degree of the second air volume electric regulating valve 503 is maintained; on the contrary, the opening degree of the second air volume electric regulating valve 503 is regulated so that the difference value is within the preset second error threshold value range.
S8, the master control system 5 acquires a signal DO2 of a first online dissolved oxygen meter 304 and a signal DO3 of a second online dissolved oxygen meter 504, and calculates a difference value delta DO2 between a signal DO2 of the first online dissolved oxygen meter 304 and a target dissolved oxygen value C2 of the second aeration tank 301; if the difference value is within the first preset value range, keeping the aeration quantity G2 of the second aeration tank 301 unchanged; otherwise, adjusting the required aeration rate G2 of the second aeration tank 301 to make the difference within a first preset value range; calculating the difference value delta DO3 between the signal DO3 of the second online dissolved oxygen meter 504 and the target dissolved oxygen value C3 of the third aeration tank 501, and if the difference value is in a second preset value range, keeping the required aeration quantity G3 of the third aeration tank 501 unchanged; otherwise, the required aeration amount G3 of the third aeration tank 501 is adjusted so that the difference is within a second preset value range.
Example 5
The embodiment provides a dissolved oxygen self-adaptive control method. The method comprises the following steps:
S1-S3, obtaining the water quantity and quality of inlet water and the water quantity and quality of outlet water, referring to Table 1, calculating the water inlet demand O2And a water amount lag time T1 corresponding to the current time.
Table 1 water quantity and Water quality
Wherein the data of the treated water amount is from an online flowmeter, and the data of the MLSS of the aeration tank is from an online sludge concentration meter.
S4, setting the temperature T to be 25 ℃, the saturation Cs (T) of oxygen under atmospheric pressure conditions, 8.4mgL at 25 ℃, the target dissolved oxygen value C2 of the second aeration tank 301 to be 3mg/L, the target dissolved oxygen value C3 of the third aeration tank 501 to be 2mg/L, and the variation coefficient k to be 169.8.
S5, the master control system 5 is based on the oxygen demand O2The target dissolved oxygen value C2 of the second aeration tank 301, the target dissolved oxygen value C3 of the third aeration tank 501, the signal q (t) of the influent flow meter 102, and the signal mlss (t) of the on-line sludge concentration meter 305 obtain the aeration demand G2 of the second aeration tank 301 and the aeration demand G3 of the third aeration tank 501.
S6, the general control system 5 acquires a signal G1 of the first gas flow meter 202, and calculates the air volume G of the blower 401 according to the aeration quantity G2 required by the second aeration tank 301 and the aeration quantity G3 required by the third aeration tank 501, wherein G is G1+ G2+ G3 is 7669m3/h。
S7, according to the air supply quantity needed G, the master control system 5 obtains the flow of the second gas flow meter 302 and the flow of the third gas flow meter 502 when the water quantity lag time T1 corresponds to the current moment, calculates the difference value delta G2 between the flow of the second gas flow meter 302 and the air quantity needed G2 of the second aeration tank 301, and if the difference value delta G2 is within a preset first error threshold range, the opening degree of the first air quantity electric regulating valve 303 is kept unchanged, and if the-3% G2 is not less than delta G2 and not more than 3% G2 are not more than delta G2; if the Δ G2< -3% G2, the opening degree of the first air quantity electric regulating valve 303 is adjusted to be larger and within a preset first error threshold value range, and if the Δ G2 is larger than 3% G2, the opening degree of the first air quantity electric regulating valve 303 is adjusted to be smaller and within a preset first error threshold value range; calculating a difference value AG 3 between the flow rate of the third gas flowmeter and the required aeration G3 of the third aeration tank; if Δ G3 is within the preset second error threshold range, the-3% G3 is not less than Δ G3 is not less than 3% G3, the opening degree of the second air volume electric regulating valve 503 is kept unchanged, and if Δ G3 is less than-3% G3, the opening degree of the second air volume electric regulating valve 503 is increased to be within the preset second error threshold range; if Δ G3 is greater than 3% G3, the opening of the second air volume electric regulating valve 503 is adjusted to be smaller within a preset second error threshold range.
And S8, DO feedback regulation. The general control system 5 acquires a signal DO2 of a first online dissolved oxygen meter 304 and a signal DO3 of a second online dissolved oxygen meter 504, and calculates a difference value delta DO2 between a signal DO2 of the first online dissolved oxygen meter 304 and a target dissolved oxygen value C2 of the second aeration tank 301; if Δ DO2>1mg/L, reduction of G2 by 300m3If Δ DO2<1mg/L, increase in G2 by 300m3H, otherwise, the rate is unchanged; calculating the difference value delta DO3 between the signal DO3 of the second online dissolved oxygen meter 504 and the target dissolved oxygen value C3 of the third aeration tank 501; if Δ DO3>1mg/L, reduction of G3 by 300m3If Δ DO3<1mg/L, increase in G3 by 300m3And/h, otherwise, not changing.
Comparative example
The device in the comparative example comprises a non-aeration tank, a first aeration tank, a second aeration tank and a third aeration tank, wherein an online dissolved oxygen instrument is arranged on the third aeration tank, a first manual regulating valve, a second manual regulating valve and a third manual regulating valve are respectively arranged on air inlet pipelines of the first aeration tank, the second aeration tank and the third aeration tank, and air is supplied uniformly by an air blower system. The operation mode is as follows: the process technician changes the running state of the blower in 2 time intervals every day according to experience, and the normal running of the water plant is guaranteed. The unit consumption of ton of water and electricity generated by the blower is 0.15 kwh/t.
After trial, the dissolved oxygen self-adaptive control method in the embodiment 5 has an obvious effect of treating sewage, and the unit consumption of water and electricity per ton generated by the air blower is 0.14kwh/t, which is 6% lower than that of the comparative example. Statistical analysis is carried out on the daily average effluent quality (ammonia nitrogen) of 3 months tried by the dissolved oxygen self-adaptive control method in the embodiment 5, the number of days for the ammonia nitrogen of the effluent to reach the standard (less than 1.0mg/L) is 116 days, and the standard reaching rate is more than 95%.
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. A dissolved oxygen adaptive control apparatus, comprising: the system comprises a non-aeration device (1), a first aeration device (2), a second aeration device (3), a blower control system (4) and a master control system;
the non-aeration device (1) comprises a non-aeration tank (101) and a water inlet flow meter (102) arranged on a water inlet pipeline of the non-aeration tank (101);
the first aeration device (2) comprises a first aeration tank (201), and a first gas flow meter (202) and a manual air quantity regulating valve (203) which are arranged on an air inlet pipeline of the first aeration tank (201);
the second aeration device (3) comprises a second aeration tank (301), a second gas flow meter (302) and a first gas quantity electric regulating valve (303) which are arranged on an air inlet pipeline of the second aeration tank (301), and a first online dissolved oxygen meter (304) and an online sludge concentration meter (305) which are arranged in the second aeration tank (301);
the non-aeration tank (101), the first aeration tank (201) and the second aeration tank (301) are sequentially communicated in series;
the blower control system (4) comprises a blower (401) and a blower controller (402);
the water inlet flow meter (102), the first gas flow meter (202), the second gas flow meter (302), the first gas quantity electric regulating valve (303), the first online dissolved oxygen meter (304), the online sludge concentration meter (305) and the blower controller (402) are respectively in signal connection with the master control system.
2. The apparatus of claim 1, further comprising: a third aeration device (5), wherein the third aeration device (5) comprises a third aeration tank (501), a third gas flow meter (502) and a second gas quantity electric regulating valve (503) which are arranged on an air inlet pipeline of the third aeration tank (501), and a second online dissolved oxygen instrument (504) which is arranged in the third aeration tank (501);
the non-aeration tank (101), the first aeration tank (201), the third aeration tank (501) and the second aeration tank (301) are sequentially communicated in series;
the third gas flow meter (502), the second gas quantity electric regulating valve (503) and the second online dissolved oxygen meter (504) are respectively in signal connection with the master control system.
3. The apparatus of claim 1, wherein the non-aeration tank (101), the first aeration tank (201), and the second aeration tank (301) are integrated and separated by a partition.
4. The apparatus according to claim 2, wherein the non-aeration tank (101), the first aeration tank (201), the third aeration tank (501) and the second aeration tank (301) are integrated and separated by a partition.
5. A self-adaptive control method of dissolved oxygen, characterized in that it is carried out in an apparatus according to any one of claims 1 to 4, said method comprising the following steps:
s1, obtaining the water quality of inlet water in the non-aeration tank (101), and calculating the oxygen demand O of the inlet water according to the water quality of the inlet water and the preset water quality of outlet water2；
S2, the master control system calculates the water quantity lag time T1 corresponding to the current moment;
s3, the master control system acquires a signal Q (t) of an inflow water flowmeter (102) and a signal MLSS (t) of an online sludge concentration meter (305);
s4, setting a target dissolved oxygen value C2 of the second aeration tank (301);
s5, the master control system is based on the oxygen demand O2Acquiring the required aeration amount G2 of the second aeration tank (301) through the target dissolved oxygen value C2 of the second aeration tank (301), the signal Q (t) of the inlet water flow meter (102) and the signal MLSS (t) of the online sludge concentration meter (305);
s6, the master control system acquires a signal G1 of the first gas flow meter (202), and calculates the air supply demand G of the blower (401) according to the air supply demand G2 of the second aeration tank (301), wherein G is G1+ G2;
s7, according to the air supply quantity G, the master control system obtains the flow of a second gas flowmeter (302) at the time of water quantity lag time T1 corresponding to the current moment, and calculates the difference delta G2 between the flow of the second gas flowmeter (302) and the air quantity G2 required by the second aeration tank (301); if the difference value is within a preset first error threshold value range, the opening degree of the first air quantity electric regulating valve (303) is kept; otherwise, the opening degree of the first air quantity electric regulating valve (303) is regulated, so that the difference value is within a preset first error threshold value range;
s8, the general control system acquires a signal DO2 of a first online dissolved oxygen instrument (304), and calculates a difference value delta DO2 between a signal DO2 of the first online dissolved oxygen instrument (304) and a target dissolved oxygen value C2 of the second aeration tank (301); if the difference value is within a first preset value range, keeping the required aeration G2 of the second aeration tank (301) unchanged; otherwise, the required aeration G2 of the second aeration tank (301) is adjusted so that the difference value is within a first preset value range.
6. The dissolved oxygen adaptive control method according to claim 5, wherein the method is carried out in the apparatus of claim 2 or 4;
step S4 is to set a target dissolved oxygen value C2 of the second aeration tank (301) and a target dissolved oxygen value C3 of the third aeration tank (501);
step S5 is that the general control system bases on the oxygen demand O2Station, stationA target dissolved oxygen value C2 of the second aeration tank (301), a target dissolved oxygen value C3 of the third aeration tank (501), a signal Q (t) of the feed water flowmeter (102) and a signal MLSS (t) of an online sludge concentration meter (305) are obtained to obtain the required aeration amount G2 of the second aeration tank (301) and the required aeration amount G3 of the third aeration tank (501);
step S6, the general control system acquires a signal G1 of a first gas flow meter (202), and calculates the air supply demand G of the blower (401) according to the air supply demand G2 of the second aeration tank (301) and the air supply demand G3 of the third aeration tank (501), wherein G is G1+ G2+ G3;
step S7, according to the air supply quantity needed G, the master control system obtains the flow rate of a second gas flowmeter (302) and the flow rate of a third gas flowmeter (502) at the time of the water quantity lag time T1 corresponding to the current time, and calculates the difference value delta G2 between the flow rate of the second gas flowmeter (302) and the air quantity needed G2 of the second aeration tank (301); if the difference value is within a preset first error threshold value range, the opening degree of the first air quantity electric regulating valve (303) is kept; otherwise, the opening degree of the first air quantity electric regulating valve (303) is regulated, so that the difference value is within a preset first error threshold value range; calculating a difference value AG 3 between the flow rate of the third gas flow meter (502) and the required aeration G3 of the third aeration tank (501); if the difference value is within a preset second error threshold value range, the opening degree of a second air quantity electric regulating valve (503) is kept; otherwise, the opening degree of the second air volume electric regulating valve (503) is regulated, so that the difference value is within a preset second error threshold value range;
step S8, the general control system acquires a signal DO2 of a first online dissolved oxygen meter (304) and a signal DO3 of a second online dissolved oxygen meter (504), and calculates a difference value delta DO2 between the signal DO2 of the first online dissolved oxygen meter (304) and a target dissolved oxygen value C2 of the second aeration tank (301); if the difference value is within a first preset value range, keeping the required aeration G2 of the second aeration tank (301) unchanged; otherwise, adjusting the required aeration G2 of the second aeration tank (301) to ensure that the difference value is within a first preset value range; calculating a difference value delta DO3 between a signal DO3 of the second online dissolved oxygen meter (504) and a target dissolved oxygen value C3 of the third aeration tank (501), and if the difference value is within a second preset value range, keeping the required aeration amount G3 of the third aeration tank (501) unchanged; otherwise, the required aeration G3 of the third aeration tank (501) is adjusted so that the difference value is within a second preset value range.
7. The adaptive dissolved oxygen control method according to claim 5, wherein in step S1, the quality of the intake water includes: BOD of the influent water and total nitrogen concentration of the influent water; the preset effluent quality comprises: the method comprises the following steps of (1) presetting BOD of effluent, total nitrogen concentration of effluent and nitrate concentration of effluent;
the oxygen demand O2The calculation formula of (2) is as follows:
wherein, the average flow rate of the Q-online flowmeter is 1 hour before;
So-BOD concentration of influent water, mg/L;
Se-BOD concentration of effluent, mg/L;
PX-excess sludge discharge, kg/d;
Nt-total kjeldahl nitrogen of the feed water, mg/L;
Nte-total kjeldahl nitrogen of the effluent, mg/L;
NOe-nitrate in water, mg/L.
8. The self-adaptive control method for dissolved oxygen according to claim 5, wherein the water amount lag time T1 corresponding to the current time is calculated by the following formula:
wherein m is a volume coefficient;
n-the number of primary sedimentation tanks;
p-number of biological pools;
VCCvolume of primary sedimentation tank, m3；
VFY-biological pond volume, m3；
Q-average flow 1 hour before, m3/s；
VINF-a flow coefficient;
qr-external reflux amount, m3/s；
Qir-internal reflux, m3/s。
9. The self-adaptive control method for dissolved oxygen according to claim 6, wherein the aeration rate G2 of the second aeration tank (301) is calculated by the following formula:
wherein, MLSS-biological pond sludge concentration, mg/L;
cs (T) -saturation of oxygen at T temperature, mg/L, under atmospheric pressure conditions;
t-temperature, DEG C;
c2-target dissolved oxygen value, mg/L, of the second aeration tank (301);
k-change coefficient, value range 160-180;
the calculation formula of the aeration quantity G3 of the third aeration tank (501) is as follows:
wherein, MLSS-biological pond sludge concentration, mg/L;
cs (T) -saturation of oxygen at T temperature, mg/L, under atmospheric pressure conditions;
t-temperature, DEG C;
c3-target dissolved oxygen value, mg/L, of the third aeration tank (501);
k-coefficient of variation, range 160 and 180.
10. The adaptive dissolved oxygen control method according to claim 6, further comprising:
s0., starting a master control system, and setting the adjusting ranges of the first air quantity electric adjusting valve (303) and the second air quantity electric adjusting valve (503); setting a threshold of change for the first gas flow meter (202), the second gas flow meter (302), the third gas flow meter (502), the first online dissolved oxygen meter (304), the second online dissolved oxygen meter (504), and the online sludge concentration meter (305); assigning a replacement value within a respective one of the variation threshold ranges if the signals of the first online dissolved oxygen meter (304), the second online dissolved oxygen meter (504), and the online sludge concentration meter (305) are not within the respective variation threshold range.
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