CN112939226B - Algorithm and system for controlling dissolved oxygen value in reasonable interval in leachate treatment - Google Patents
Algorithm and system for controlling dissolved oxygen value in reasonable interval in leachate treatment Download PDFInfo
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Abstract
The invention belongs to the technical field of landfill leachate treatment, and particularly relates to an algorithm and a system for controlling a dissolved oxygen value in a reasonable interval in leachate treatment, wherein the algorithm for controlling the dissolved oxygen value in the reasonable interval in the leachate treatment comprises the following steps: setting the range of dissolved oxygen concentration in the leachate treatment; detecting the real-time dissolved oxygen concentration in the treatment of the leachate; and the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration are adjusted in the leachate treatment process, so that the real-time dissolved oxygen concentration is in the range of the dissolved oxygen concentration, the most reasonable operation interval for effectively controlling the dissolved oxygen value is realized, the system operation stability is greatly improved, the energy consumption is reduced under the condition of ensuring the effluent water quality, the frequent manual intervention of a control system is reduced, and the labor intensity of operators is reduced.
Description
Technical Field
The invention belongs to the technical field of landfill leachate treatment, and particularly relates to an algorithm and a system for controlling a dissolved oxygen value in a reasonable interval in leachate treatment.
Background
The leachate of the incineration plant in China has the characteristics of complex water quality, high COD (chemical oxygen demand), BOD (biochemical oxygen demand) and ammonia nitrogen content and the like, at present, anaerobic treatment is mostly adopted to reduce the concentration of pollutants, then aerobic treatment and post-treatment processes are adopted, and different anaerobic reactors, A/O (anaerobic/aerobic) treatment processes and advanced treatment modes (membrane systems) are selected according to the characteristics of the water quality of the leachate to achieve the aim of efficiently removing the COD and the ammonia nitrogen.
In the A/O treatment process, a large amount of air is required to be provided in O tanks to provide oxygen required for microbial decomposition of organic matters in the tanks, and each O tank is provided with a dissolved oxygen concentration monitoring instrument. The current mainstream is to provide oxygen by jet aeration. The high-efficiency jet aerator is combined with the air blower and the jet circulating pump to form a jet aeration system. The circulating water pump continuously pumps the mixed liquid in the aeration tank, and the mixed liquid is pressurized by the jet circulation pump and then is sprayed out from the nozzle of the jet aerator.
The concentration of dissolved oxygen is one of the important parameters affecting the effect of the A/O treatment. The dissolved oxygen in the system is enough to meet the requirements of the oxidation and nitration of the organic matters, so that the nitration reaction is sufficient; and secondly, the dissolved oxygen concentration cannot be too high, so that a dissolved oxygen concentration gradient can be generated in the microbial floc to promote the formation of an anoxic microenvironment, and energy waste is caused by too high dissolved oxygen. Therefore, it is necessary to control the dissolved oxygen within a reasonable range (which is set by process engineers and is not within the scope of the present invention). However, the characteristics of the leachate cause the dissolved oxygen value to change greatly and the hysteresis is serious, so that the traditional control algorithm (such as PID control) has poor control effect and often causes unstable effluent quality or high energy consumption. At present, the control of dissolved oxygen in the percolate treatment industry is manually controlled by operators depending on own experience. But also has the problems of poor regulation and control effect and high labor intensity of personnel.
Therefore, a new algorithm and system for controlling the dissolved oxygen value in a reasonable interval in the leachate treatment needs to be designed based on the above technical problems.
Disclosure of Invention
The invention aims to provide an algorithm and a system for controlling dissolved oxygen value in a reasonable interval in leachate treatment.
In order to solve the technical problem, the invention provides an algorithm for controlling the dissolved oxygen value in a reasonable interval in the treatment of percolate, which comprises the following steps:
setting the range of dissolved oxygen concentration in the treatment of leachate;
detecting the real-time dissolved oxygen concentration in the treatment of the leachate; and
and adjusting according to the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration in the leachate treatment so as to enable the real-time dissolved oxygen concentration to be within the range of the dissolved oxygen concentration.
Further, the method for setting the range of the dissolved oxygen concentration in the leachate treatment comprises the following steps:
the dissolved oxygen concentration range of the first aerobic tank is set as follows: [ a, b ];
the dissolved oxygen concentration range of the second aerobic tank is set as follows: [ c, d ];
wherein a, b, c and d are specific numerical values.
Further, the method for detecting the real-time dissolved oxygen concentration in the leachate treatment comprises the following steps:
detection ofReal-time dissolved oxygen concentration DO of first aerobic tank 1 ；
Detecting real-time Dissolved Oxygen (DO) concentration of the second aerobic tank 2 。
Further, the method for adjusting the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration in the leachate treatment so that the real-time dissolved oxygen concentration is within the range of the dissolved oxygen concentration comprises the following steps:
according to the real-time dissolved oxygen concentration DO of the first aerobic tank 1 And adjusting the dissolved oxygen concentration range of the first aerobic tank so that the real-time dissolved oxygen concentration of the first aerobic tank is within the dissolved oxygen concentration range of the first aerobic tank, namely
When DO is present 1 >When b, reducing the frequency of the first jet pump by a preset reduction frequency, and waiting t time to continuously detect DO 1 At this time, if DO 1 >b, continuously reducing the frequency of the first jet pump by a preset reduction frequency, and continuously detecting DO (data DO) after waiting t time 1 Until the frequency of the first jet pump is reduced by the maximum reduction frequency or a is less than or equal to DO 1 ≤b；
DO after the first jet pump frequency is reduced by the maximum reduction frequency 1 >b, reducing the opening of the first air quantity adjusting valve by a preset reducing opening, and waiting for t time to continuously detect DO (dissolved oxygen) 1 At this time, if DO 1 >b, continuously reducing the opening of the first air volume adjusting valve by a preset reduction opening, and continuously detecting DO (dissolved oxygen) after waiting for t time 1 Until the opening degree of the first air volume adjusting valve is reduced by the maximum closing opening degree or a is less than or equal to DO 1 ≤b；
DO (dissolved oxygen) after the opening of the first adjusting air volume valve is reduced by the maximum closing opening 1 >b, reducing the total aeration quantity by a preset reduction percentage, and continuously detecting DO in waiting for t time 1 At this time, if DO 1 >b, continuously reducing the total aeration amount by a preset reduction percentage, and continuously detecting DO after waiting t time 1 Until the total aeration rate is reduced by the maximum reduction percentage or a is less than or equal to DO 1 ≤b；
DO after the total aeration has decreased by the maximum percent reduction 1 >And b, alarming.
Further, the real-time dissolved oxygen concentration DO according to the first aerobic tank 1 And the dissolved oxygen concentration range of the first aerobic tank is adjusted, so that the real-time dissolved oxygen concentration of the first aerobic tank is within the dissolved oxygen concentration range of the first aerobic tank, and the method further comprises the following steps:
when a is less than or equal to DO 1 When b is less than or equal to b, the current situation is maintained.
Further, the real-time dissolved oxygen concentration DO according to the first aerobic tank 1 And the dissolved oxygen concentration range of the first aerobic tank is adjusted, so that the real-time dissolved oxygen concentration of the first aerobic tank is within the dissolved oxygen concentration range of the first aerobic tank, and the method further comprises the following steps:
when DO is present 1 <When a, increasing the frequency of the first jet pump by a preset increasing frequency, and waiting t time to continuously detect DO (dissolved oxygen) 1 At this time, if DO 1 <a, continuously increasing the frequency of the first jet pump by a preset increasing frequency, and continuously detecting DO after waiting for t time 1 Until the frequency of the first jet pump increases by the maximum increasing frequency or a is less than or equal to DO 1 ≤b；
DO after the frequency of the first jet pump increases by the maximum increase frequency 1 <a, opening the first air quantity adjusting valve by a preset opening degree, waiting for t time, and continuously detecting DO (dissolved oxygen) 1 At this time, if DO 1 <a, continuously increasing the opening degree of the first air volume adjusting valve by a preset opening degree until the opening degree of the first air volume adjusting valve is increased by a maximum opening degree or a is not more than DO 1 ≤b；
DO after the opening of the air volume valve is adjusted to be larger than the maximum opening 1 <a, increasing the total aeration quantity by a preset increase percentage, and continuously detecting DO in the waiting time t 1 At this time, if DO 1 <a, continuously increasing the total aeration amount by a preset increase percentage, and continuously detecting DO in the waiting time t 1 Until the total aeration rate increases by the maximum increase percentage or a is less than or equal to DO 1 ≤b；
DO after increasing the total aeration by a maximum percent increase 1 <and a, alarming.
Further, the method for adjusting the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration in the leachate treatment so that the real-time dissolved oxygen concentration is within the range of the dissolved oxygen concentration comprises the following steps:
according to the real-time dissolved oxygen concentration DO of the second aerobic tank 1 And adjusting the dissolved oxygen concentration range of the second aerobic tank so that the real-time dissolved oxygen concentration of the second aerobic tank is within the dissolved oxygen concentration range of the second aerobic tank, namely
When DO is present 2 >When d, reducing the frequency of the second jet pump by a preset reduction frequency, and waiting t time to continuously detect DO 2 At this time, if DO 2 >d, continuously reducing the frequency of the second jet pump by a preset reduction frequency, and continuously detecting DO in waiting for t time 2 Until the frequency of the second jet pump is reduced by the maximum reduction frequency or c is less than or equal to DO 2 ≤d；
DO after the second jet pump frequency is reduced by the maximum reduction frequency 2 >d, closing the opening of the second air volume adjusting valve to a preset closing opening, and waiting for t time to continuously detect DO 2 At this time, if DO 2 >d, continuously reducing the opening of the second air volume adjusting valve by a preset reduction opening, and continuously detecting DO (dissolved oxygen) after waiting for t time 2 Until the opening of the second air volume adjusting valve is reduced by the maximum closing opening or c is less than or equal to DO 2 ≤d；
DO after the opening of the second air volume adjusting valve is reduced to the maximum closing opening 2 >d, reducing the total aeration quantity by a preset reduction percentage, and continuously detecting DO in waiting for t time 2 At this time, if DO 2 >d, continuously reducing the total aeration amount by a preset reduction percentage, and continuously detecting DO after waiting for t time 2 Until the total aeration rate is reduced by the maximum reduction percentage or c is less than or equal to DO 2 ≤d；
DO after the total aeration has been reduced by a maximum reduction percentage 2 >And d, alarming.
Further, the real-time dissolved oxygen concentration DO according to the second aerobic tank 1 And adjusting the dissolved oxygen concentration range of the second aerobic tank so that the real-time dissolved oxygen concentration of the second aerobic tank is within the dissolved oxygen concentration range of the second aerobic tank, wherein the method further comprises the following steps:
when c is less than or equal to DO 2 When d is less than or equal to d, the current situation is maintained.
Further, the real-time dissolved oxygen concentration DO of the second aerobic tank is used 1 And the solution of the second aerobic tankThe method for adjusting the oxygen concentration range to enable the real-time dissolved oxygen concentration of the second aerobic tank to be within the dissolved oxygen concentration range of the second aerobic tank further comprises the following steps:
when DO is present 2 <When c, increasing the frequency of the second jet pump by a preset increasing frequency, and waiting t time to continuously detect DO 2 At this time, if DO 2 <c, continuously increasing the frequency of the second jet pump by a preset increasing frequency, and continuously detecting the DO after waiting for t time 2 Until the frequency of the second jet pump increases the maximum increasing frequency or c is less than or equal to DO 2 ≤d；
DO after the frequency of the second jet pump increases by the maximum increase frequency 2 <c, opening the second air volume adjusting valve by a preset opening degree, and waiting for t time to continuously detect DO 2 At this time, if DO 2 <c, continuously increasing the opening degree of the second air volume adjusting valve by a preset opening degree until the opening degree of the second air volume adjusting valve is increased by a maximum opening degree or c is less than or equal to DO 2 ≤d；
DO after the opening of the second air volume adjusting valve is increased by the maximum opening 2 <c, increasing the total aeration quantity by a preset increase percentage, and continuously detecting DO in the waiting time t 2 At this time, if DO 2 <c, continuously increasing the total aeration amount by a preset increase percentage, and continuously detecting DO after waiting for t time 2 Until the total aeration rate increases by the maximum increase percentage or c is less than or equal to DO 2 ≤d；
DO after the increase of the total aeration by the maximum percentage increase 2 <And c, alarming.
On the other hand, the invention also provides a system for controlling the dissolved oxygen value in the reasonable interval in the leachate treatment by adopting the algorithm for controlling the dissolved oxygen value in the reasonable interval in the leachate treatment, which comprises the following steps:
the system comprises an anoxic tank, a first aerobic tank, a second aerobic tank, a control module, and an aeration fan, a first dissolved oxygen concentration monitoring instrument, a second dissolved oxygen concentration monitoring instrument, a first jet pump, a first air volume adjusting valve, a second jet pump and a second air volume adjusting valve which are electrically connected with the control module;
the anoxic tank, the first aerobic tank and the second aerobic tank are sequentially arranged and communicated;
the first dissolved oxygen concentration monitoring instrument is arranged in the first aerobic tank;
the second dissolved oxygen concentration monitoring instrument is arranged in the second aerobic tank;
the control module is suitable for detecting the dissolved oxygen concentration in the first aerobic tank through the first dissolved oxygen concentration monitoring instrument;
the control module is suitable for detecting the dissolved oxygen concentration in the second aerobic tank through the second dissolved oxygen concentration monitoring instrument;
the control module is suitable for controlling the frequency of the first jet pump, the opening of the first adjusting air volume valve and the total aeration volume of the aeration fan so as to enable the real-time dissolved oxygen concentration in the first aerobic tank to be within the range of the dissolved oxygen concentration in the first aerobic tank;
the control module is suitable for controlling the frequency of the second jet pump, the opening of the second adjusting air volume valve and the total aeration volume of the aeration fan, so that the real-time dissolved oxygen concentration in the second aerobic tank is within the range of the dissolved oxygen concentration in the second aerobic tank.
The invention has the advantages that the invention sets the range of the dissolved oxygen concentration in the treatment of the percolate; detecting the real-time dissolved oxygen concentration in the treatment of the leachate; and the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration are adjusted in the leachate treatment process, so that the real-time dissolved oxygen concentration is in the range of the dissolved oxygen concentration, the most reasonable operation interval for effectively controlling the dissolved oxygen value is realized, the system operation stability is greatly improved, the energy consumption is reduced under the condition of ensuring the effluent water quality, the frequent manual intervention of a control system is reduced, and the labor intensity of operators is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of an algorithm for controlling dissolved oxygen values within a reasonable interval in leachate treatment according to the present invention;
FIG. 2 is a trigger condition to which the present invention relates;
FIG. 3 is a logic diagram of the control of the first aerobic tank DO according to the present invention;
FIG. 4 is a logic diagram of the control of the second aerobic tank DO according to the present invention;
FIG. 5 is a schematic block diagram of a system for controlling dissolved oxygen values within reasonable intervals in leachate treatment in accordance with the present invention;
figure 6 is a schematic diagram of a system for controlling dissolved oxygen values within reasonable intervals in leachate treatment in accordance with the present invention.
In the figure:
the device comprises an anoxic tank 1, a first aerobic tank 2, a second aerobic tank 3, an aeration fan 4, a first dissolved oxygen concentration monitoring instrument 5, a second dissolved oxygen concentration monitoring instrument 6, a first jet pump 7, a first air quantity adjusting valve 8, a second jet pump 9 and a second air quantity adjusting valve 10.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
FIG. 1 is a flow chart of an algorithm for controlling dissolved oxygen values within a reasonable interval in leachate treatment according to the present invention.
As shown in fig. 1, this embodiment 1 provides an algorithm for controlling dissolved oxygen value in a reasonable interval in a leachate treatment, which includes: setting the range of dissolved oxygen concentration in the leachate treatment; detecting the real-time dissolved oxygen concentration in the treatment of the leachate; the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration in the leachate treatment are adjusted to enable the real-time dissolved oxygen concentration to be within the range of the dissolved oxygen concentration, so that the most reasonable operation interval for effectively controlling the dissolved oxygen value is realized, the system operation stability is greatly improved, the energy consumption is reduced under the condition of ensuring the effluent water quality, meanwhile, manual intervention is not needed, the frequent manual intervention of a control system is reduced, the labor intensity of operators is reduced, and the system reliability is improved; the production operation is ensured to be stable, and the automation rate of the equipment is improved.
The COD is removed by adopting an anaerobic reactor in a percolate treatment plant, and the total nitrogen and ammonia nitrogen are efficiently removed by adopting an A/O treatment process (namely an anoxic/aerobic treatment process). In the A/O treatment process, 1A pool (an anoxic pool 1) and 2O pools (a first aerobic pool 2 and a second aerobic pool 3, wherein the first aerobic pool 2 is a primary aerobic pool, and the first aerobic pool 2 is a primary aerobic pool) are arranged, and each O pool is provided with a dissolved oxygen concentration monitoring instrument (DO is used for replacing the dissolved oxygen concentration in the following). An aeration fan 4 is used as an air source of the aeration system, the air quantity of each O pool is controlled by adjusting the opening degree of an air quantity valve (generally, the opening degree is represented by%) to provide oxygen by adopting a jet aeration mode, the variable-frequency speed regulation of a jet pump motor (generally, the motor frequency is represented by HZ, the frequency is higher, the flow is higher) is used for adjusting the flow of jet flow in real time, and equipment is connected to an automatic control system (a control module and a PLC) to carry out remote operation and monitoring.
In this embodiment, the method for setting the range of dissolved oxygen concentration in the leachate treatment comprises: the dissolved oxygen concentration range of the first aerobic tank 2 (No. 1O tank) is set as follows: [ a, b ]; the dissolved oxygen concentration range of the second aerobic pool 3 (2 # O pool) is set as follows: [ c, d ]; wherein a, b, c and d are specific numerical values.
In this embodiment, the method for detecting the real-time dissolved oxygen concentration in the leachate treatment comprises the following steps: detecting the real-time dissolved oxygen concentration DO of the first aerobic tank 2 1 (ii) a Detecting the real-time dissolved oxygen concentration DO of the second aerobic tank 3 2 。
FIG. 2 is a trigger condition to which the present invention relates;
FIG. 3 is a logic diagram of the control of the first aerobic tank DO according to the present invention;
FIG. 4 is a logic diagram of the control of the second aerobic tank DO according to the present invention;
as shown in fig. 2, fig. 3 and fig. 4, in the present embodiment, the method for adjusting the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration in the leachate treatment so that the real-time dissolved oxygen concentration is within the range of the dissolved oxygen concentration includes: according to the real-time dissolved oxygen concentration DO of the first aerobic tank 2 1 And the dissolved oxygen concentration range of the first aerobic tank 2 is adjusted so that the real-time dissolved oxygen concentration of the first aerobic tank 2 is within the dissolved oxygen concentration range of the first aerobic tank 2, namely
When DO is present 1 >When b, the frequency of the first jet pump 7 is reduced by a preset reduction frequency (5 Hz), and the DO is continuously detected after waiting for t time (because the influence on the DO after the action of relevant equipment has great hysteresis, the DO value is judged after waiting for a period of time, generally 15-30 minutes, and the time is represented by a letter t) 1 At this time, if DO 1 >b, continuously reducing the frequency of the first jet pump 7 by a preset reduction frequency, and continuously detecting DO after waiting for t time 1 Until the frequency of the first jet pump 7 is reduced by the maximum reduction frequency (30 Hz) or a is less than or equal to DO 1 ≤b；
DO after the frequency of the first jet pump 7 has decreased by the maximum reduction frequency 1 >b (entering a valve adjusting mode), reducing the opening of the first air volume adjusting valve 8 by a preset reducing opening (10%), and continuously detecting DO (dissolved oxygen) after waiting for t time 1 At this time, if DO 1 >b, continuously reducing the opening of the first air quantity adjusting valve 8 by a preset reducing opening, and continuously detecting DO (dissolved oxygen) after waiting t time 1 Until the opening degree of the first air volume adjusting valve 8 is reduced by the maximum closing opening degree (50 percent) or a is less than or equal to DO 1 ≤b；
When it is firstDO after the opening of the air volume valve 8 is adjusted to be reduced and the maximum opening is reduced 1 >b (entering a gas regulation mode), reducing the total aeration amount by a preset reduction percentage (5%), and continuously detecting DO in waiting for t time 1 At this time, if DO 1 >b, continuously reducing the total aeration amount by a preset reduction percentage, and continuously detecting DO after waiting for t time 1 Until the total aeration quantity is reduced by the maximum reduction percentage (reduced to 0.7 times of the original initial aeration quantity, namely 70 percent of the original initial aeration quantity) or a is less than or equal to DO 1 ≤b；
DO after the total aeration has decreased by the maximum percent reduction 1 >And b, alarming to show that the DO value cannot be automatically adjusted due to the fact that the whole A/O system is abnormal.
In this embodiment, the real-time dissolved oxygen concentration DO according to the first aerobic tank 2 1 And the dissolved oxygen concentration range of the first aerobic tank 2 is adjusted, so that the real-time dissolved oxygen concentration of the first aerobic tank 2 is within the dissolved oxygen concentration range of the first aerobic tank 2, and the method further comprises the following steps: when a is less than or equal to DO 1 And when the b is less than or equal to b, maintaining the current situation and not operating each device.
In this embodiment, the real-time dissolved oxygen concentration DO according to the first aerobic tank 2 1 And the dissolved oxygen concentration range of the first aerobic tank 2 is adjusted, so that the real-time dissolved oxygen concentration of the first aerobic tank 2 is within the dissolved oxygen concentration range of the first aerobic tank 2, and the method further comprises the following steps:
when DO is present 1 <When a is needed, the frequency of the first jet pump 7 is increased by a preset increasing frequency (5 Hz), and DO is continuously detected after t time 1 At this time, if DO 1 <a, continuously increasing the frequency of the first jet pump 7 by a preset increasing frequency, and continuously detecting DO after waiting for t time 1 Until the frequency of the first jet pump 7 increases by the maximum increase frequency (50 Hz) or a is less than or equal to DO 1 ≤b；
DO after the frequency of the first jet pump 7 has increased by the maximum increase frequency 1 <a, opening of the first air volume adjusting valve 8 is increased by a preset opening (10%), and DO is continuously detected after t time 1 At this time, if DO 1 <a, continuously increasing the opening degree of the first air volume adjusting valve 8 by a preset opening degree until the opening degree of the first air volume adjusting valve 8 is increased by a maximum opening degreeDegree (100%) or a ≦ DO 1 ≤b；
DO after the opening of the air volume valve is adjusted to be larger than the maximum opening 1 <a, increasing the total aeration amount by a preset increase percentage (5%), and continuously detecting DO in the waiting time t 1 At this time, if DO 1 <a, continuously increasing the total aeration amount by a preset increase percentage, and continuously detecting DO after waiting t time 1 Until the total aeration rate is increased by the maximum increase percentage (increased to 1.3 times of the original initial aeration rate, namely 130 percent of the original initial aeration rate) or a is less than or equal to DO 1 ≤b；
DO after the increase of the total aeration by the maximum percentage increase 1 <and a, alarming.
In this embodiment, the method for adjusting the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration in the leachate treatment so that the real-time dissolved oxygen concentration is within the range of the dissolved oxygen concentration includes:
according to the real-time dissolved oxygen concentration DO of the second aerobic tank 3 1 And the dissolved oxygen concentration range of the second aerobic tank 3 is adjusted so that the real-time dissolved oxygen concentration of the second aerobic tank 3 is within the dissolved oxygen concentration range of the second aerobic tank 3, namely
When DO is present 2 >d, reducing the frequency of the second jet pump 9 by a preset reduction frequency, and continuously detecting DO in waiting for t time 2 At this time, if DO 2 >d, continuously reducing the frequency of the second jet pump 9 by a preset reduction frequency, and continuously detecting the DO after waiting for t time 2 Until the frequency of the second jet pump 9 is reduced by the maximum reduction frequency or c is less than or equal to DO 2 ≤d；
DO after the frequency of the second jet pump 9 has decreased by the maximum reduction frequency 2 >d, closing the opening of the second air volume adjusting valve 10 to a preset closing opening, and waiting for t time to continuously detect DO 2 At this time, if DO 2 >d, continuously reducing the opening of the second air volume adjusting valve 10 by a preset reduction opening, and continuously detecting DO after waiting for t time 2 Until the opening of the second air volume adjusting valve 10 is reduced by the maximum closing opening or c is less than or equal to DO 2 ≤d；
DO after the opening of the second air volume adjusting valve 10 is reduced to the maximum closing opening 2 >d, exposing the total exposureReducing the gas amount by a preset reduction percentage, and waiting t time to continuously detect DO 2 At this time, if DO 2 >d, continuously reducing the total aeration amount by a preset reduction percentage, and continuously detecting DO after waiting t time 2 Until the total aeration rate is reduced by the maximum reduction percentage or c is less than or equal to DO 2 ≤d；
DO after the total aeration has decreased by the maximum percent reduction 2 >And d, alarming.
DO independent operation algorithms of the first aerobic tank 2 and the second aerobic tank 3 DO not interfere with each other in most of time. Waiting time in the algorithm of another aerobic tank needs to be reset (i.e. t is re-timed) only when the total aeration quantity is increased/decreased; for example, the 2# o tank algorithm increases aeration by 5%, while monitoring the DO decision time in the 1# o tank algorithm for 13 minutes, it is reset, and the DO decision time in the 1# o tank algorithm is timed from 0 minutes again. If the 1# O pool algorithm is not executing the determine latency step, then no action is taken. If abnormal conditions such as equipment failure and the like occur in the algorithm execution process, the algorithm stops running.
In this embodiment, the real-time dissolved oxygen concentration DO according to the second aerobic tank 3 1 And the dissolved oxygen concentration range of the second aerobic tank 3 is adjusted, so that the real-time dissolved oxygen concentration of the second aerobic tank 3 is within the dissolved oxygen concentration range of the second aerobic tank 3, and the method further comprises the following steps: when c is less than or equal to DO 2 When d is less than or equal to d, the current situation is maintained.
In this embodiment, the real-time dissolved oxygen concentration DO according to the second aerobic tank 3 1 And the dissolved oxygen concentration range of the second aerobic tank 3 is adjusted, so that the real-time dissolved oxygen concentration of the second aerobic tank 3 is in the dissolved oxygen concentration range of the second aerobic tank 3, and the method further comprises the following steps:
when DO is present 2 <When c, increasing the frequency of the second jet pump 9 by a preset increasing frequency, and continuously detecting DO after waiting t time 2 At this time, if DO 2 <c, continuously increasing the frequency of the second jet pump 9 by a preset increasing frequency, and continuously detecting DO after waiting for t time 2 Until the frequency of the second jet pump 9 increases the maximum increasing frequency or c is less than or equal to DO 2 ≤d；
When the second jet pump9 DO after frequency increase by maximum increase frequency 2 <c, opening the second air volume adjusting valve 10 by a preset opening, and waiting for t time to continuously detect DO 2 At this time, if DO 2 <c, continuously increasing the opening degree of the second air quantity adjusting valve 10 by a preset opening degree until the opening degree of the second air quantity adjusting valve 10 is increased by the maximum opening degree or c is less than or equal to DO 2 ≤d；
DO after the opening of the second adjusting air volume valve 10 is increased by the maximum opening 2 <c, increasing the total aeration quantity by a preset increase percentage, and waiting for t time to continuously detect DO 2 At this time, if DO 2 <c, continuously increasing the total aeration quantity by a preset increase percentage, and continuously detecting DO after waiting t time 2 Until the total aeration rate increases by the maximum increase percentage or c is less than or equal to DO 2 ≤d；
DO after increasing the total aeration by a maximum percent increase 2 <And c, alarming.
Example 2
FIG. 5 is a schematic block diagram of a system for controlling dissolved oxygen values within reasonable intervals in leachate treatment according to the present invention;
FIG. 6 is a schematic view of a system for controlling dissolved oxygen values within reasonable intervals in leachate treatment according to the present invention.
As shown in fig. 5 and fig. 6, based on the embodiment 1, the present embodiment 2 further provides a system for controlling dissolved oxygen value in a reasonable interval in the leachate treatment by using the algorithm for controlling dissolved oxygen value in a reasonable interval in the leachate treatment in the embodiment 1, comprising: the system comprises an anoxic tank 1, a first aerobic tank 2, a second aerobic tank 3, a control module, and an aeration fan 4, a first dissolved oxygen concentration monitoring instrument 5, a second dissolved oxygen concentration monitoring instrument 6, a first jet pump 7, a first air volume adjusting valve 8, a second jet pump 9 and a second air volume adjusting valve 10 which are electrically connected with the control module; the anoxic tank 1, the first aerobic tank 2 and the second aerobic tank 3 are arranged in sequence and communicated; the first dissolved oxygen concentration monitoring instrument 5 is arranged in the first aerobic tank 2; the second dissolved oxygen concentration monitoring instrument 6 is arranged in the second aerobic tank 3; the control module is suitable for detecting the dissolved oxygen concentration in the first aerobic tank 2 through the first dissolved oxygen concentration monitoring instrument 5; the control module is suitable for detecting the dissolved oxygen concentration in the second aerobic tank 3 through the second dissolved oxygen concentration monitoring instrument 6; the control module is suitable for controlling the frequency of the first jet pump 7, the opening of the first adjusting air quantity valve 8 and the total aeration quantity of the aeration fan 4 so as to enable the real-time dissolved oxygen concentration in the first aerobic tank 2 to be within the range of the dissolved oxygen concentration in the first aerobic tank 2; the control module is suitable for controlling the frequency of the second jet pump 9, the opening degree of the second adjusting air quantity valve 10 and the total aeration quantity of the aeration fan 4, so that the real-time dissolved oxygen concentration in the second aerobic tank 3 is within the range of the dissolved oxygen concentration in the second aerobic tank 3.
In this embodiment, the control module may precisely control the dissolved oxygen values in the first aerobic tank 2 and the second aerobic tank 3 in the reasonable interval by using the algorithm for controlling the dissolved oxygen value in the reasonable interval in the leachate treatment as described in embodiment 1.
In conclusion, the invention sets the range of the dissolved oxygen concentration in the leachate treatment; detecting the real-time dissolved oxygen concentration in the treatment of the leachate; and the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration are adjusted in the leachate treatment process, so that the real-time dissolved oxygen concentration is in the range of the dissolved oxygen concentration, the most reasonable operation interval for effectively controlling the dissolved oxygen value is realized, the system operation stability is greatly improved, the energy consumption is reduced under the condition of ensuring the effluent water quality, the frequent manual intervention of a control system is reduced, and the labor intensity of operators is reduced.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. An algorithm for controlling dissolved oxygen value in reasonable interval in leachate treatment is characterized by comprising the following steps:
setting the range of dissolved oxygen concentration in the leachate treatment: setting the dissolved oxygen concentration range of the first aerobic tank as [ a, b ], setting the dissolved oxygen concentration range of the second aerobic tank as [ c, d ], wherein a, b, c and d are specific numerical values;
detecting the real-time dissolved oxygen concentration in the leachate treatment: detecting the real-time dissolved oxygen concentration DO1 of the first aerobic tank and detecting the real-time dissolved oxygen concentration DO2 of the second aerobic tank; and
adjusting according to the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration in the leachate treatment so as to enable the real-time dissolved oxygen concentration to be within the range of the dissolved oxygen concentration:
adjusting according to the real-time dissolved oxygen concentration DO1 of the first aerobic tank and the dissolved oxygen concentration range of the first aerobic tank so that the real-time dissolved oxygen concentration of the first aerobic tank is within the dissolved oxygen concentration range of the first aerobic tank, namely
When DO1 is greater than b, the frequency of the first jet pump is reduced by a preset reduction frequency, DO1 is continuously detected after t time, at the moment, if DO1 is greater than b, the frequency of the first jet pump is continuously reduced by the preset reduction frequency, and DO1 is continuously detected after t time until the frequency of the first jet pump is reduced by the maximum reduction frequency or a is not less than DO1 and not more than b;
when DO1 is greater than b after the frequency of the first jet pump is reduced by the maximum reduction frequency, reducing the opening of the first air volume adjusting valve by a preset reduction opening, and continuously detecting DO1 for t time, wherein if DO1 is greater than b, continuously reducing the opening of the first air volume adjusting valve by the preset reduction opening, and continuously detecting DO1 for t time until the opening of the first air volume adjusting valve is reduced by the maximum reduction opening or a is not more than DO1 and not more than b;
when the opening degree of the first air volume adjusting valve is reduced to the maximum opening degree, DO1 is greater than b, the total aeration quantity is reduced by a preset reduction percentage, DO1 is continuously detected for t time, at the moment, if DO1 is greater than b, the total aeration quantity is continuously reduced by the preset reduction percentage, DO1 is continuously detected for t time until the total aeration quantity is reduced by the maximum reduction percentage or a is greater than or equal to DO1 and less than or equal to b;
when the total aeration amount is reduced by the maximum reduction percentage, DO1> b, alarming;
when a is more than or equal to DO1 and less than or equal to b, maintaining the current situation;
when DO1 is greater than a, increasing the frequency of the first jet pump by a preset increasing frequency, waiting t time to continuously detect DO1, if DO1 is greater than a, continuously increasing the frequency of the first jet pump by the preset increasing frequency, and waiting t time to continuously detect DO1 until the frequency of the first jet pump is increased by the maximum increasing frequency or a is greater than or equal to DO1 and less than or equal to b;
when DO1 is less than a after the frequency of the first jet pump is increased by the maximum increasing frequency, opening of the first adjusting air volume valve is increased by a preset opening degree, and DO1 is continuously detected for t time, and at the moment, if DO1 is less than a, opening of the first adjusting air volume valve is continuously increased by the preset opening degree until the opening of the first adjusting air volume valve is increased to the maximum opening degree or a is not less than DO1 and not more than b;
when the DO1 is less than a after the opening of the air volume valve is adjusted to the maximum opening, increasing the total aeration by a preset increase percentage, and continuously detecting the DO1 after waiting for the time t, wherein if the DO1 is less than a, continuously increasing the total aeration by the preset increase percentage, and continuously detecting the DO1 after waiting for the time t until the total aeration is increased by the maximum increase percentage or the DO1 is more than or equal to a and less than or equal to b;
when the total aeration quantity is increased by the maximum increase percentage, DO1< a, an alarm is given.
2. The algorithm for controlling dissolved oxygen value in reasonable intervals in leachate treatment as claimed in claim 1, wherein,
the method for adjusting the real-time dissolved oxygen concentration and the range of the dissolved oxygen concentration in the leachate treatment so as to enable the real-time dissolved oxygen concentration to be within the range of the dissolved oxygen concentration comprises the following steps:
adjusting according to the real-time dissolved oxygen concentration DO1 of the second aerobic tank and the dissolved oxygen concentration range of the second aerobic tank so that the real-time dissolved oxygen concentration of the second aerobic tank is within the dissolved oxygen concentration range of the second aerobic tank, namely
When DO2 is larger than d, reducing the frequency of the second jet pump by preset reduction frequency, waiting t time to continuously detect DO2, if DO2 is larger than d, continuously reducing the frequency of the second jet pump by preset reduction frequency, waiting t time to continuously detect DO2 until the frequency of the second jet pump is reduced by the maximum reduction frequency or c is not less than DO2 and not more than d;
when the frequency of the second jet pump is reduced by the maximum reduction frequency and then DO2 is larger than d, reducing the opening of the second air quantity adjusting valve by a preset reduction opening, and continuously detecting DO2 after waiting for t time, wherein if DO2 is larger than d, continuously reducing the opening of the second air quantity adjusting valve by the preset reduction opening, and continuously detecting DO2 after waiting for t time until the opening of the second air quantity adjusting valve is reduced by the maximum reduction opening or c is less than or equal to DO2 and less than or equal to d;
when the opening of the second air volume adjusting valve is reduced by the maximum reduction opening, the DO2 is larger than d, the total aeration quantity is reduced by the preset reduction percentage, and the DO2 is continuously detected after waiting for t time, at the moment, if the DO2 is larger than d, the total aeration quantity is continuously reduced by the preset reduction percentage, and the DO2 is continuously detected after waiting for t time until the total aeration quantity is reduced by the maximum reduction percentage or c is less than or equal to the DO2 and less than or equal to d;
and when the total aeration quantity is reduced by the maximum reduction percentage, DO2> d, and alarming.
3. The algorithm for controlling dissolved oxygen value in leachate treatment as claimed in claim 2, wherein,
the method for adjusting according to the real-time dissolved oxygen concentration DO1 of the second aerobic tank and the dissolved oxygen concentration range of the second aerobic tank so that the real-time dissolved oxygen concentration of the second aerobic tank is within the dissolved oxygen concentration range of the second aerobic tank further comprises the following steps:
when c is less than or equal to DO2 and less than or equal to d, the current situation is maintained.
4. The algorithm for controlling dissolved oxygen value in leachate treatment as claimed in claim 3, wherein,
the method for adjusting according to the real-time dissolved oxygen concentration DO1 of the second aerobic tank and the dissolved oxygen concentration range of the second aerobic tank so that the real-time dissolved oxygen concentration of the second aerobic tank is within the dissolved oxygen concentration range of the second aerobic tank further comprises the following steps:
when DO2 is less than c, increasing the preset increasing frequency by the frequency of the second jet pump, waiting t time to continue detecting DO2, if DO2 is less than c, continuing increasing the preset increasing frequency by the frequency of the second jet pump, and waiting t time to continue detecting DO2 until the frequency of the second jet pump is increased by the maximum increasing frequency or c is less than or equal to DO2 and less than or equal to d;
when DO2 is less than c after the frequency of the second jet pump is increased by the maximum increasing frequency, opening degree of the second air volume adjusting valve is increased by a preset opening degree, and DO2 is continuously detected for t time, and at the moment, if DO2 is less than c, opening degree of the second air volume adjusting valve is continuously increased by the preset opening degree until the opening degree of the second air volume adjusting valve is increased by the maximum opening degree or c is not more than DO2 and not more than d;
when the DO2 is less than c after the opening of the second air volume adjusting valve is increased by the maximum opening, increasing the total aeration amount by the preset increasing percentage, and continuously detecting the DO2 after waiting for the time t, wherein if the DO2 is less than c, continuously increasing the total aeration amount by the preset increasing percentage, and continuously detecting the DO2 after waiting for the time t until the total aeration amount is increased by the maximum increasing percentage or c is more than or equal to DO2 and less than or equal to d;
and when the total aeration quantity is increased by the maximum increase percentage, the DO2< c is alarmed.
5. A system for controlling dissolved oxygen values within reasonable intervals in leachate treatment using the algorithm for controlling dissolved oxygen values within reasonable intervals in leachate treatment according to any of claims 1-4, comprising:
the system comprises an anoxic tank, a first aerobic tank, a second aerobic tank, a control module, and an aeration fan, a first dissolved oxygen concentration monitoring instrument, a second dissolved oxygen concentration monitoring instrument, a first jet pump, a first air volume adjusting valve, a second jet pump and a second air volume adjusting valve which are electrically connected with the control module;
the anoxic tank, the first aerobic tank and the second aerobic tank are sequentially arranged and communicated;
the first dissolved oxygen concentration monitoring instrument is arranged in the first aerobic tank;
the second dissolved oxygen concentration monitoring instrument is arranged in the second aerobic tank;
the control module is suitable for detecting the dissolved oxygen concentration in the first aerobic tank through the first dissolved oxygen concentration monitoring instrument;
the control module is suitable for detecting the dissolved oxygen concentration in the second aerobic tank through the second dissolved oxygen concentration monitoring instrument;
the control module is suitable for controlling the frequency of the first jet pump, the opening of the first adjusting air volume valve and the total aeration volume of the aeration fan so as to enable the real-time dissolved oxygen concentration in the first aerobic tank to be within the range of the dissolved oxygen concentration in the first aerobic tank;
the control module is suitable for controlling the frequency of the second jet pump, the opening of the second adjusting air volume valve and the total aeration volume of the aeration fan, so that the real-time dissolved oxygen concentration in the second aerobic tank is within the range of the dissolved oxygen concentration in the second aerobic tank.
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