CN115246680A - Accurate intermittent aeration control system and method - Google Patents

Accurate intermittent aeration control system and method Download PDF

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CN115246680A
CN115246680A CN202210897207.8A CN202210897207A CN115246680A CN 115246680 A CN115246680 A CN 115246680A CN 202210897207 A CN202210897207 A CN 202210897207A CN 115246680 A CN115246680 A CN 115246680A
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aeration
value
ammonia nitrogen
pneumatic butterfly
intermittent
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杨欣光
韩冬冬
谈小雁
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Shanghai Jianbang Environmental Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • 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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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/15—N03-N
    • 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
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract

The application discloses a precise intermittent aeration control system and a method, which are used for precisely controlling intermittent aeration in a biochemical pool, wherein the control system comprises a control module, a blower master control cabinet, a valve group controller and an aeration pipeline; the aeration pipeline comprises a plurality of aeration grids which are uniformly arranged in the aerobic tank, and the aeration grids divide the aerobic tank into a plurality of aeration subareas; the aeration grids are provided with aerators on the nodes, each aeration grid is connected with one aeration branch pipe, all the aeration branch pipes are connected to an aeration main pipe in a gathering manner, the aeration main pipe is connected to a blower, and each aeration branch pipe is provided with an independent pneumatic butterfly valve; the control module controls and connects the valve group controller and the air blower general control cabinet, the valve group controller controls and connects all the pneumatic butterfly valves, the air blower general control cabinet controls and connects the air blower, the pneumatic butterfly valve is equipped with two kinds of running states: an open state, an intermittent open state. The pneumatic butterfly valve is set to be in a clearance opening state, so that energy consumption can be reduced, and the benefit of the biochemical pool is improved.

Description

Accurate intermittent aeration control system and method
Technical Field
The application relates to a precise intermittent aeration control system and a method, relating to the technical field of sewage treatment.
Background
The sewage treatment plant is an important ring for regional environment treatment, and the electric charge is the maximum cost expenditure and can account for more than 50% of the total expenditure cost.
The core treatment unit of a sewage treatment plant is biochemical treatment, and the most widely applied method is activated sludge. The activated sludge can carry out different reactions under different conditions, generally speaking, the biochemical tank can be divided into an anaerobic tank, an anoxic tank and an aerobic tank, and the three tanks can be flexibly matched according to water inlet conditions in practical application. A typical structure of a biochemical tank of a sewage treatment plant is shown in fig. 1, the biochemical tank comprises a pre-anoxic tank 1, an anaerobic tank 2, an anoxic tank 3 and an aerobic tank 4 which are connected in sequence, generally, one to two grids are arranged in the anoxic tank 3, a plurality of grids are arranged in the aerobic tank 4, and an air supply pipeline is arranged in the aerobic tank 4 for realizing oxygen supply in the aerobic tank 4. In the power consumption composition of the sewage treatment plant, the proportion of the blowers supplying oxygen to the aerobic tank 4 is the largest, and is even more than 50%. Therefore, the control of the blower and the reasonable distribution of the air volume directly affect the operation cost of the whole sewage treatment plant.
The following problems are frequently existed in the control of the aeration system of the sewage treatment plant:
1. the aeration quantity of the aerobic tank is not matched with the actual requirement, and when the aeration quantity is small, the biochemical reaction in the aerobic tank is not finished; when the aeration amount is large, the sludge is over-oxidized, and a large amount of electricity is consumed.
2. The common activated sludge method is to carry out denitrification reaction on nitrification liquid which finishes nitrification reaction and inlet water in an anoxic environment for denitrification, but over-aeration can destroy the anoxic environment of other tanks, influence the denitrification effect and further influence the total nitrogen removal effect.
3. Most sewage treatment plants stay in the control of aeration according to the frequency of controlling the fan by dissolved oxygen at the tail end of the aeration tank, the control mode has certain hysteresis for the detection of the dissolved oxygen, and meanwhile, the aeration quantity is fed back to the dissolved oxygen, so that the satisfactory effect of accurate aeration is difficult to achieve, and a large amount of energy consumption waste is caused.
4. The actual load of the sewage treatment plant has larger deviation and violent change than the design load, and a large number of sewage treatment plants have the phenomena of carbon deficiency and high nitrogen and phosphorus.
5. A part of sewage treatment plants use a method of intermittent operation of a blower at present to save energy consumption and strengthen denitrification at the same time, but the artificial control method is not accurate enough and has limitations.
Disclosure of Invention
The technical problem that this application will be solved is how to carry out the intermittent type aeration in good oxygen pond, reduce the power consumption on the basis of keeping biochemical pond sewage treatment efficiency to solve present biochemical pond aeration rate and actual demand and not match, the destruction of the high dissolved oxygen that excessive aeration caused to the oxygen deficiency effect, the energy that the control of roughness of aeration system leads to is extravagant, actual load is great and change acutely than the design load deviation, there is the problem of limitation in conventional intermittent type aeration.
In order to solve the technical problems, the technical scheme of the application provides a precise intermittent aeration control system for precisely controlling intermittent aeration in a biochemical pool, wherein the biochemical pool comprises a pre-anoxic pool, an anaerobic pool, an anoxic pool and an aerobic pool which are sequentially connected, and further comprises an inner return pipeline connected from the aerobic pool to the anoxic pool and an outer return pipeline connected from an external settling zone to the pre-anoxic pool; the aeration pipeline comprises a plurality of aeration grids which are uniformly arranged in the aerobic tank, and the aeration grids divide the aerobic tank into a plurality of aeration subareas; the aeration grids are provided with aerators on nodes, each aeration grid is connected with one aeration branch pipe, all the aeration branch pipes are connected to an aeration main pipe in a gathering manner, the aeration main pipe is connected to a blower, and each aeration branch pipe is provided with an independent pneumatic butterfly valve; the control module controls and connects a valve group controller and a blower main control cabinet, the valve group controller controls and connects all pneumatic butterfly valves, the blower main control cabinet controls and connects the blower, and the pneumatic butterfly valves are provided with two running states: open state, intermittent open state.
Specifically, the intermittent on state is set as: the pneumatic butterfly valve is in a closed state, the valve group controller periodically opens and closes the pneumatic butterfly valve, and single-strand pulse mode airflow is emitted into the pool.
Preferably, the control system further comprises an acquisition module, and the acquisition module comprises: the ammonia nitrogen instrument is arranged at the middle section of the aerobic tank and used for measuring ammonia nitrogen data A of the located section, the dissolved oxygen instrument is arranged at the water inlet point of the aerobic tank, the ammonia nitrogen instrument is arranged at the installation position of the ammonia nitrogen instrument, the dissolved oxygen instrument is arranged at the backflow point of the aerobic tank and is respectively used for measuring dissolved oxygen values D1, D2 and D3 of the located section, the nitrate nitrogen instrument is arranged at the water inlet point of the aerobic tank and is respectively used for measuring nitrate nitrogen values X1 and X2 of the located section, the water inlet flow meter is arranged at the water inlet position of the biochemical tank and is used for measuring the water inlet flow Q1 of the biochemical tank, the nitrified liquid backflow flow meter is arranged on the inner backflow pipeline and is used for measuring the nitrified liquid backflow flow Q2, and the sludge backflow flow meter is arranged on the outer backflow pipeline and is used for measuring the sludge backflow flow Q3; the acquisition module is connected to the control module.
By adopting the control system, the calculation module of the application comprises an accurate intermittent aeration control method, and is characterized in that an aeration grid is utilized to divide an aerobic pool into a plurality of aeration sub-areas, the intermittent aeration state of each aeration sub-area is judged through an algorithm, and the air volume is regulated and controlled, and the method comprises the following specific steps:
according to the water flow direction, the aeration sub-areas controlled by the aeration branch pipes are numbered and respectively marked as B1, B2, 8230, bn, and the valves on the aeration branch pipes are numbered and respectively marked as 1, 2, 8230, n.
Step two, calculating the real-time residence time T of a single aeration subregion:
Figure BDA0003769387880000031
in the formula: v — effective volume of a single aerated sub-zone;
actual residence time of aeration T General assembly ＝nT；
Step three, calculating the ammonia nitrogen removal rate v of the aeration area in front of the ammonia nitrogen instrument:
Figure BDA0003769387880000032
in the formula: a1, setting an ammonia nitrogen value of inlet water of an aerobic tank;
n1, the number of aeration subareas in an aeration state in front of the ammonia nitrogen instrument;
step four, calculating the critical value An of aeration needing to be started in each aeration subarea:
An＝βvT(n-n1)
in the formula: an-opening critical value of An aeration subregion controlled by An nth valve;
beta-revision parameter determined by the slope change of the onsite nitrification experiment;
step five, judging the operation state of the pneumatic butterfly valve:
when A0 is larger than An, the pneumatic butterfly valve of the represented aeration subarea is in An opening state;
when A0 is not more than An, the represented pneumatic butterfly valve of the aeration subarea is in An intermittent opening state;
wherein A0 is a reference value;
step six, calculating the nitrate nitrogen removal rate v of the anoxic tank:
Figure BDA0003769387880000033
in the formula: v-lac-the effective volume of the anoxic tank;
step seven, judging whether the aerobic tank can finish the nitration reaction under the current operation state;
judging whether the current denitrification reaction is not finished;
if one of the two points is not satisfied, all pneumatic butterfly valves in front of the ammonia nitrogen instrument are set to be in an open state;
the two points are satisfied, and the number n2 of the valves for intermittent opening is calculated according to the nitrate nitrogen removal rate v lack, the nitrate nitrogen value X1 of the aerobic water inlet point and the real-time retention time T of a single aeration subregion
Figure BDA0003769387880000041
Specifically, in the seventh step, the criterion for judging whether the aerobic tank can complete the nitrification reaction in the current operation state is as follows: when at least one of all valves at the rear end of the ammonia nitrogen instrument is in an intermittent operation state, judging that the nitration reaction is finished in the current state; the judgment criteria for judging whether the current denitrification reaction is not completed are as follows: manually inputting a reference value X, and judging that the current denitrification reaction is not completed when X1 is larger than X.
Preferably, the method also comprises the step eight of accurately controlling the output air volume of the blower:
controlling the blower according to the number of the pneumatic butterfly valves set to be in an opening state, the measured values of the ammonia nitrogen instrument and the dissolved oxygen instrument, and specifically comprising the following steps:
8.1, counting the number of aeration subareas of the current pneumatic butterfly valve in an open state, and recording the number as m;
8.2 setting a balance air quantity value as C;
8.3 on the basis of balancing the air volume C, adjusting the air volume to be larger when the current ammonia nitrogen value A is higher than the internal control value by utilizing the difference value between the ammonia nitrogen index of the internal control outlet water and the ammonia nitrogen index of the internal control outlet water, and otherwise, adjusting the air volume to be smaller, wherein the system adjusting proportion can reach +/-100 percent, so as to obtain a rough adjusting air volume D;
8.4 finely adjusting the air quantity according to the variation rate of the ammonia nitrogen value on the basis of the coarse adjustment air quantity D, wherein the variation rate range of the ammonia nitrogen value is between-100% and +100%, the adjustment ratio of the fine adjustment air quantity is between-30% and +30%, a linear relation is formed between the air quantity and the system adjustment ratio, and the fine adjustment air quantity E is obtained by performing fine adjustment on the air quantity;
8.5 finely adjusting the finely adjusted air quantity according to the current value of the dissolved oxygen D2 on the basis of the finely adjusted air quantity E, setting a standard dissolved oxygen value, finely adjusting the air quantity according to the deviation amplitude of the actual dissolved oxygen D2 value and the standard dissolved oxygen value, wherein the finely adjusted air quantity adjustment proportion is [ -10%, +10% ], and obtaining the finely adjusted air quantity F;
8.6 on the basis of fine adjustment of the air volume F, adjusting the air volume F according to the m value, and carrying out integral amplification or reduction according to the valve opening quantity comparison standard value to finally obtain the output air volume G.
In step 8.2, the balance air quantity value C is derived from manual input or the following calculation formula:
C＝γQ1
in the formula: gamma-monthly mean gas-water ratio.
Drawings
FIG. 1 is a schematic diagram of a typical structure of a biochemical pool;
FIG. 2 is a schematic view of an aeration line structure provided in the example;
fig. 3 is a structure diagram of a precise intermittent aeration control system.
Detailed Description
In order to make the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Examples
The embodiment provides a precise intermittent aeration control system and a method, and fig. 1 shows a biochemical tank structure of a certain sewage treatment plant, wherein the biochemical tank comprises a pre-anoxic tank 1, an anaerobic tank 2, an anoxic tank 3 and an aerobic tank 4 which are sequentially connected, the anoxic tank 3 is provided with two grids, the aerobic tank 4 is provided with five grids, and the biochemical tank further comprises an inner return pipeline connected to the anoxic tank 3 from the aerobic tank 4 and an outer return pipeline connected to the pre-anoxic tank 1 from an external settling zone;
in order to realize accurate intermittent aeration control, the structure of the biochemical pool needs to be added with:
the ammonia nitrogen instrument 131 is arranged at the middle section of the aerobic tank 4 and is used for measuring ammonia nitrogen data A of the section where the instrument is located; the specific position of the ammonia nitrogen instrument 131 is calculated according to the following formula:
Figure BDA0003769387880000051
in the formula: w is the percentage of the instrument to the total length of the aerobic water inlet and the aerobic area;
a, revising parameters, which are determined by the slope change of a field nitration experiment;
k, designing coefficient of the sewage treatment plant;
c, setting a product of a designed effluent ammonia nitrogen numerical value and a COD (chemical oxygen demand) numerical value;
c, multiplying the ammonia nitrogen numerical value and the COD numerical value of the inner-inner control effluent;
eta-70% of the pollution load of the influent water and the following days account for the days of the whole year.
Three DO meters (dissolved oxygen meters) arranged at the water inlet point, the ammonia nitrogen meter 131 installation position and the return point of the aerobic tank are respectively arranged: the first dissolved oxygen meter 111, the second dissolved oxygen meter 112, and the third dissolved oxygen meter 113 are used to measure the dissolved oxygen value of the cross section, which is denoted as D1, D2, and D3.
Two nitrate nitrogen meters are arranged at the water inlet point and the return point of the aerobic tank: the first nitrate nitrogen meter 121 and the second nitrate nitrogen meter 122 are respectively used for measuring the nitrate nitrogen value of the section, and are marked as X1 and X2.
And a water inlet flow meter 101 arranged at the water inlet of the biochemical pool measures the water inlet flow of the biochemical pool and records as Q1.
And a nitrified liquid reflux flow meter 102 arranged on the inner reflux pipeline and used for measuring the nitrified liquid reflux flow and recording as Q2.
And the sludge backflow flowmeter 103 is arranged on the outer backflow pipeline and used for measuring the sludge backflow flow and is marked as Q3.
Aeration grids are uniformly arranged in the aerobic tanks 4 according to the area, aerators are arranged on the nodes of the aeration grids, aeration branch pipes are connected with each aeration grid, the aeration area and the number of the aerators controlled by each aeration branch pipe are the same or close, for example, as shown in figures 1 and 2, 18 aeration grids are arranged in the five aerobic tanks 4, the aeration branch pipes are 18, and each aeration branch pipe is provided with a pneumatic butterfly valve 401-4018 and numbered according to the water flow direction;
the pneumatic butterfly valve is divided into two operation states: an open state, an intermittent open state;
an opening state: the valve is in an open state;
intermittent on state: the valve is in a closed state, the valve group controller periodically opens and closes the valve, and single-strand pulse mode airflow (accounting for about 3 to 4 percent of the total air volume) is sent to the aeration grid; the valve is opened and closed periodically in an intermittent opening state, wherein the specific opening and closing period can be set, and is set to be closed for 30min and opened for 2min in the embodiment;
the pneumatic butterfly valve in each aerobic tank 4 is controlled by one valve group controller, five aerobic tanks 4 correspond to five valve group controllers, specifically, the first valve group controller 301 controls the first pneumatic butterfly valve 401, the second pneumatic butterfly valve 402, the third pneumatic butterfly valve 403, the fourth pneumatic butterfly valve 404 and the fifth pneumatic butterfly valve 405 corresponding to the first aerobic tank, and the second valve group controller 302, the third valve group controller 303, the fourth valve group controller 304 and the fifth valve group controller 305 respectively control the pneumatic butterfly valves in the corresponding aerobic tanks;
all the aeration branch pipes are gathered to an aeration main pipe, the air supply of the aeration main pipe is supplied by a plurality of air blowers, so that the requirement of the air supply amount is met, in the embodiment, three air blowers are adopted, namely a first air blower 411, a second air blower 412 and a third air blower 413 are adopted, and the three air blowers are all magnetic suspension air blowers and are controlled by an air blower main control cabinet 311; the total aeration rate of the aeration main is measured by a gas flow meter 141 provided on the aeration main and is denoted by q.
And the control module is used for executing the control method and sending out a control instruction.
In conclusion, the valve group controller receives the signals transmitted from the control module and specifically controls the pneumatic butterfly valve according to the signals; the blower main control cabinet 311 receives the air volume signal transmitted from the control module, and adjusts the frequency of the blower according to the air volume signal to provide the required air volume; specifically, the air blower main control cabinet can adopt PID adjustment to control the air blower frequency according to the air volume signal.
The control module reads the measurement data of all the instruments, calculates according to the internal control method, and transmits the control instruction to the valve group controller or the blower main control cabinet 311 after obtaining the calculation result, so as to perform specific regulation and control.
The control method specifically comprises the following steps:
according to the water flow direction, the aeration sub-areas controlled by the aeration branch pipes are numbered, namely B1, B2, 8230, 8230Bn, and the valves on the aeration branch pipes are numbered, namely 1, 2, 8230, 8230and n.
Step two, calculating the real-time residence time T of a single aeration subregion:
Figure BDA0003769387880000071
in the formula: t-real time residence time (h) of a single aerated sub-zone;
v-effective volume of a Single aerated sub-region (m) 3 )；
Actual residence time of aeration T General (1) = nT; and calculating the T value in real time, rounding and displaying in real time.
Step three, calculating the ammonia nitrogen removal rate v of the front aeration area of the ammonia nitrogen instrument 131 according to the set water inlet information, the reading value of the ammonia nitrogen instrument 131 and the retention time T:
Figure BDA0003769387880000072
in the formula: v-ammonia nitrogen removal rate (mg/min) of the aeration area in front of the ammonia nitrogen instrument 131;
a1, setting the ammonia nitrogen value (mg/L) of the inlet water of the aerobic tank;
a is the reading of the ammonia nitrogen instrument 131;
n 1-the number of aeration sub-areas in the aeration state in front of the ammonia nitrogen meter 131.
Step four, calculating the critical value An of each aeration subarea needing to be aerated according to the ammonia nitrogen removal rate v and the residence time from the ammonia nitrogen meter 131 to each valve of the rear section:
An＝βvT(n-n1)
in the formula: an is the opening critical value (mg/L) of the aeration subarea controlled by the nth valve;
beta-revision parameter, determined by the slope change of the field nitrification experiment.
Step five, judging the running state of the pneumatic butterfly valve:
when A0 is larger than An, the pneumatic butterfly valve of the represented aeration subarea is in An opening state;
when A0 is not more than An, the pneumatic butterfly valve of the represented aeration subarea is in An intermittent opening state;
a0 is a reference value and represents a measured value of water in the aeration subarea in real time at an ammonia nitrogen instrument before a period of time.
Step six, according to the effective volume V of the anoxic pond, the effective volume m of the anoxic pond 3 ) And calculating the nitrate nitrogen removal rate v lack (mg/min) of the anoxic pond by using the aerobic reflux point nitrate nitrogen value X2 and the comprehensive flow meter:
Figure BDA0003769387880000081
step seven, judging whether the aerobic tank can finish the nitrification reaction in the current running state, and judging whether the current denitrification reaction is not finished;
specifically, when at least one of all valves at the rear end of the ammonia nitrogen instrument is in an intermittent operation state, the nitrification reaction can be judged to be completed in the current state;
for the denitrification reaction, a reference value X =1.0mg/L can be manually input, and when X1 is greater than X, the current denitrification reaction is judged to be not completed;
if the two points are not met, namely the nitration reaction is not finished or the denitrification reaction is finished, all pneumatic butterfly valves in front of the ammonia nitrogen instrument 131 are completely opened;
both of the above two points are satisfied, i.e., the nitration reaction is completed and the denitrification reaction is not completed. And calculating the number n2 of valves which can be intermittently opened according to the nitrate nitrogen removal rate v lack, the nitrate nitrogen value X1 of the aerobic water inlet point and the real-time retention time T of a single aeration subregion.
Figure BDA0003769387880000082
According to the steps, the number of the pneumatic butterfly valves in the opening state and the number of the pneumatic butterfly valves in the intermittent opening state can be adjusted according to the real-time state of the biochemical pool, and the intermittent aeration is carried out in a self-adaptive manner; in order to control the output air quantity of the blower more accurately, the following method can be adopted:
and step eight, controlling the blower according to the measured values of the ammonia nitrogen instrument 131 and the DO instrument by combining the number of the pneumatic butterfly valves in the opening states, wherein the specific method comprises the following steps:
8.1 counting the number of aeration subareas of the pneumatic butterfly valve in an open state at present, and recording the number as m;
8.2 setting a balance air quantity value as C, wherein the balance air quantity value can be manually input and calculated and can be flexibly carried out according to different plant conditions; specifically, the C value algorithm is different according to different calculation modes of different plant conditions, and this embodiment provides a simple calculation formula:
C＝γQ1
in the formula: c, balancing air volume;
gamma-monthly mean gas-water ratio;
in this example, C is 6000m 3 /h。
8.3 on the basis of balancing the air volume C, adjusting the air volume to be larger when the current ammonia nitrogen value A is higher than the internal control value by utilizing the difference value between the ammonia nitrogen index of the internal control outlet water and the ammonia nitrogen index of the internal control outlet water, and otherwise, adjusting the air volume to be smaller, wherein the system adjusting proportion can reach +/-100 percent, so as to obtain the rough adjusting air volume D.
8.4 on the basis of the rough air volume D, finely adjusting the rough air volume according to the variation rate of the ammonia nitrogen value, wherein the variation rate range of the ammonia nitrogen value is between-100% and +100%, the fine air volume adjustment proportion is between-30% and +30%, a linear relation is formed between the air volume and the system adjustment proportion, and the fine air volume E is obtained by performing systematic fine adjustment on the air volume.
8.5 finely adjusting the finely adjusted air quantity according to the current value of the dissolved oxygen D2 on the basis of the finely adjusted air quantity E, setting a standard dissolved oxygen value (in the embodiment, 0.75), finely adjusting the air quantity according to the deviation amplitude of the actual dissolved oxygen D2 value and the standard value, wherein the finely adjusted air quantity adjustment ratio is [ -10%, +10% ], and obtaining the finely adjusted air quantity F.
8.6 on the basis of fine adjustment of the air volume F, adjusting the air volume F according to the m value, and integrally amplifying or reducing the standard opening value of the valve according to the opening number of the valve to finally obtain the output air volume G.
In this embodiment, the total number of the valves is 18, the standard opening value of the valves is set to 9, and the output air volume G can be obtained according to the following formula:
Figure BDA0003769387880000091
in the formula: n3 — the number of valves currently in an open state;
and finally, regulating the frequency of the fan according to the output air volume G by PID logic among the air blower, the master control cabinet and the gas flow meter, so that the air blower outputs the air volume G.

Claims (7)

1. A precise intermittent aeration control system is used for precisely controlling intermittent aeration in a biochemical pool, wherein the biochemical pool comprises a pre-anoxic pool, an anaerobic pool, an anoxic pool and an aerobic pool which are sequentially connected, and further comprises an inner return pipeline connected from the aerobic pool to the anoxic pool and an outer return pipeline connected from an external settling zone to the pre-anoxic pool, and the system is characterized in that the control system comprises a control module, a blower main control cabinet, a valve group controller and an aeration pipeline; the aeration pipeline comprises a plurality of aeration grids which are uniformly arranged in the aerobic tank, and the aeration grids divide the aerobic tank into a plurality of aeration subareas; the aeration grids are provided with aerators on nodes, each aeration grid is connected with one aeration branch pipe, all the aeration branch pipes are connected to an aeration main pipe in a gathering manner, the aeration main pipe is connected to a blower, and each aeration branch pipe is provided with an independent pneumatic butterfly valve; the control module controls and connects a valve group controller and a blower main control cabinet, the valve group controller controls and connects all pneumatic butterfly valves, the blower main control cabinet controls and connects the blower, and the pneumatic butterfly valves are provided with two running states: open state, intermittent open state.
2. A precision intermittent aeration control system according to claim 1, wherein the intermittent on state is set as: the pneumatic butterfly valve is in a closed state, the valve group controller periodically opens and closes the pneumatic butterfly valve, and single-strand pulse mode airflow is emitted into the pool.
3. The system of claim 2, wherein the control system further comprises an acquisition module, the acquisition module comprising: the ammonia nitrogen instrument is arranged at the middle section of the aerobic tank and used for measuring ammonia nitrogen data A of the located section, the dissolved oxygen instrument is arranged at the water inlet point of the aerobic tank, the ammonia nitrogen instrument is arranged at the installation position of the ammonia nitrogen instrument, the dissolved oxygen instrument is arranged at the backflow point of the aerobic tank and is respectively used for measuring dissolved oxygen values D1, D2 and D3 of the located section, the nitrate nitrogen instrument is arranged at the water inlet point of the aerobic tank and is respectively used for measuring nitrate nitrogen values X1 and X2 of the located section, the water inlet flow meter is arranged at the water inlet position of the biochemical tank and is used for measuring the water inlet flow Q1 of the biochemical tank, the nitrified liquid backflow flow meter is arranged on the inner backflow pipeline and is used for measuring the nitrified liquid backflow flow Q2, and the sludge backflow flow meter is arranged on the outer backflow pipeline and is used for measuring the sludge backflow flow Q3; the acquisition module is connected to the control module.
4. A precise intermittent aeration control method, which adopts the control system of claim 3, is characterized by comprising the following steps:
according to the water flow direction, the aeration sub-areas controlled by the aeration branch pipes are numbered, namely B1, B2, 8230, 8230Bn, and the valves on the aeration branch pipes are numbered, namely 1, 2, 8230, 8230and n.
Step two, calculating the real-time residence time T of a single aeration subregion:
Figure FDA0003769387870000011
in the formula: v — effective volume of a single aerated sub-zone;
actual aeration retention time T General (1) ＝nT；
Step three, calculating the ammonia nitrogen removal rate v of the aeration area in front of the ammonia nitrogen instrument:
Figure FDA0003769387870000021
in the formula: a1, setting an ammonia nitrogen value of inlet water of an aerobic tank;
n1, the number of aeration subareas in an aeration state in front of the ammonia nitrogen instrument;
step four, calculating a critical value An of aeration needing to be started in each aeration subarea:
An＝βvT(n-n1)
in the formula: an-opening critical value of An aeration subregion controlled by An nth valve;
beta-revision parameter determined by slope change of on-site nitrification experiment;
step five, judging the operation state of the pneumatic butterfly valve:
when A0 is larger than An, the pneumatic butterfly valve of the represented aeration subarea is in An opening state;
when A0 is not more than An, the represented pneumatic butterfly valve of the aeration subarea is in An intermittent opening state;
wherein A0 is a reference value;
step six, calculating the nitrate nitrogen removal rate v of the anoxic tank:
Figure FDA0003769387870000022
in the formula: v-lac-the effective volume of the anoxic tank;
step seven, judging whether the aerobic tank can finish the nitration reaction under the current operation state;
judging whether the current denitrification reaction is not finished;
if one of the two points is not satisfied, all pneumatic butterfly valves in front of the ammonia nitrogen instrument are set to be in an open state;
the two points are satisfied, and the number n2 of the valves for intermittent opening is calculated according to the nitrate nitrogen removal rate v lack, the nitrate nitrogen value X1 of the aerobic water inlet point and the real-time retention time T of a single aeration subregion
Figure FDA0003769387870000023
5. The method for precisely controlling intermittent aeration according to claim 4, wherein in the seventh step, the criterion for judging whether the aerobic tank can complete the nitrification reaction under the current operation state is as follows: when at least one of all valves at the rear end of the ammonia nitrogen instrument is in an intermittent operation state, judging that the nitration reaction is finished under the current state; the judgment criteria for judging whether the current denitrification reaction is not completed are as follows: manually inputting a reference value X, and judging that the current denitrification reaction is not finished when X1 is more than X.
6. The precise intermittent aeration control method according to claim 4, characterized by further comprising the step eight of precisely controlling the output air volume of the blower:
the method comprises the following steps of controlling the air blower according to the number of the pneumatic butterfly valves set to be in an opening state, the measured values of the ammonia nitrogen instrument and the dissolved oxygen instrument, and specifically comprising the following steps:
8.1 counting the number of aeration subareas of the pneumatic butterfly valve in an open state at present, and recording the number as m;
8.2 setting a balance air quantity value as C;
8.3 on the basis of balancing the air volume C, adjusting the air volume to be larger when the current ammonia nitrogen value A is higher than the internal control value by utilizing the difference value between the ammonia nitrogen index of the internal control outlet water and the ammonia nitrogen index of the internal control outlet water, and otherwise, adjusting the air volume to be smaller, wherein the system adjusting proportion can reach +/-100 percent, so as to obtain a rough adjusting air volume D;
8.4 finely adjusting the air quantity according to the variation rate of the ammonia nitrogen value on the basis of the rough adjustment air quantity D, wherein the variation rate range of the ammonia nitrogen value is between-100% and +100%, the fine adjustment air quantity adjustment proportion is between-30% and +30%, a linear relation is formed between the air quantity and the system adjustment proportion, and the fine adjustment air quantity E is obtained by performing series fine adjustment on the air quantity;
8.5 finely adjusting the finely adjusted air quantity according to the current value of the dissolved oxygen D2 on the basis of the finely adjusted air quantity E, setting a standard dissolved oxygen value, finely adjusting the air quantity according to the deviation amplitude of the actual dissolved oxygen D2 value and the standard dissolved oxygen value, wherein the finely adjusted air quantity adjustment proportion is [ -10%, +10% ], and obtaining the finely adjusted air quantity F;
8.6 on the basis of fine adjustment of the air volume F, adjusting the air volume F according to the m value, and carrying out integral amplification or reduction according to the valve opening quantity comparison standard value to finally obtain the output air volume G.
7. A precise intermittent aeration control method according to claim 6 characterized in that in step 8.2, the balance air quantity value C is derived from manual input or the following calculation formula:
C＝γQ1
in the formula: gamma-monthly mean gas-water ratio.
CN202210897207.8A 2022-07-28 2022-07-28 Accurate intermittent aeration control system and method Pending CN115246680A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116216913A (en) * 2023-02-20 2023-06-06 浙江数翰科技有限公司 MBBR pulse aeration control method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116216913A (en) * 2023-02-20 2023-06-06 浙江数翰科技有限公司 MBBR pulse aeration control method and system
CN116216913B (en) * 2023-02-20 2023-12-05 浙江数翰科技有限公司 MBBR pulse aeration control method and system

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