CN107986428A - A kind of sewage disposal accurate aeration method - Google Patents
A kind of sewage disposal accurate aeration method Download PDFInfo
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- CN107986428A CN107986428A CN201711351017.1A CN201711351017A CN107986428A CN 107986428 A CN107986428 A CN 107986428A CN 201711351017 A CN201711351017 A CN 201711351017A CN 107986428 A CN107986428 A CN 107986428A
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- butterfly valve
- dissolved oxygen
- air
- value
- biological tank
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a kind of sewage disposal accurate aeration method, according to the change of online dissolved oxygen concentration, the aeration quantity of each biological tank is adjusted by regulating butterfly valve aperture and air header pressure, solves the problems, such as dissolved oxygen response lag, frequent regulating butterfly valve is avoided, system pressure is stablized relatively, that is, reaches accurate control effect, the service life of equipment is extended again, has been finally reached energy saving purpose.
Description
Technical field
The present invention relates to technical field of sewage, and in particular to a kind of sewage disposal accurate aeration method.
Background technology
Biological wastewater treatment is the metabolism by microorganism, and pollutant is decomposed, absorb or is adsorbed and is come in fact
The purification of existing water quality, cost is low compared with physics, chemical method, caused secondary pollution is minimum in efficient and processing procedure,
It is current mainstream wastewater treatment method.To meet the needs of processing separate sources and heterogeneity waste water, develop and detested
Polytype biological treatments such as one aerobic activated sludge technique of oxygen, oxidation ditch process, SBR, AB method, biological contact oxidation process, BAF
Technique and reactor.In these different types of techniques, the Aerobic Process for Treatment stage can be generally included, to complete the oxygen of organic matter
Change and the removal of ammonia nitrogen.It is more using blast aeration at present to provide aerobic environment to microorganism.To a certain degree
On, the control of aeration quantity decides treatment effect and sewage treatment plant energy consumption level of the whole system to waste water.Because aeration quantity
Nitration reaction that will be in suppression system when smaller, can additionally cause der Pilz in biological tank to breed, cause sludge bulking：And
When aeration quantity is larger, aeration power consumption can not only wasted, while strong air stirring can also smash sludge flco so as to influence
Effluent quality.In addition, if when treatment process has nitrification liquid reflux, oxygen can also be brought into anoxic zone by the nitrification liquid of reflux, so that
Influence denitrification effect.Since the conditions such as the influent quality of sewage plant and water temperature have larger fluctuation, this also requires to be aerated
During in time adjustment aeration quantity, to tackle this change.
In order to realize energy control for need and reduce aeration energy consumption, there has been proposed the imagination accurately controlled aeration quantity.
So-called accurate aeration control is exactly that in-line meter and valve and air compressor control are integrated into an intelligentized control system
In the middle, by dynamically optimize with adjustment air demand, accomplish energy control for need as far as possible, thus reach stable sewage effluents water quality and
Energy saving purpose.As sewage treatment plant's on-line monitoring instrument and technical equipment performance improve, accurate aeration control from
Theory becomes a reality.
Domestic and international more mature accurate aeration control technology can be divided into two kinds at present：" feedforward+feedback+biological treatment mould
Block " and " hardware system of feedback regulation+superior performance ".
Feedforward+feedback+bio processing module, this control mode be by international water association activated sludge model based on,
The change of the water quality and quantity detected according to sewage plant history data and in-line meter, predicts the aeration needed for biological tank
Amount, in conjunction with the index such as actual dissolved oxygen, water temperature, MLSS and hydraulic pressure in biological tank, to adjust air mass flow distribution and air blower
Air quantity.The control model is more perfect, but needs to gather more index, has higher requirement to the stability of instrument,
And biology modules are also difficult to predict air demand needed for biological tank exactly.The representational control system of the pattern is U.S.'s life
Change the bioprocess technology intelligence control system (BIOS+BACS) and Shanghai sky deep blue of scientific ＆ technical corporation (BioChcmTechnology lnc)
The AVS accurate aeration flow control systems of system control technique Co., Ltd." feedforward+feedback+bio processing module "
Accurate aeration system, can calculate aeration quantity, but due to the actual air demand of biological tank not only with amount of inlet water, water quality,
Water temperature, sludge concentration have outside the Pass, length of efficiency, aerating pipelines, the flow velocity of biological tank and admixture also with aeration head etc.
Many factors are related, and often air demand is calculated with actually having a long way to go.But in order to meet biological tank air demand, actual air is total
Pipe pressure can maintain higher scope.Increase air demand when dissolved oxygen reduces, valve opening is reduced when dissolved oxygen raises
Reduce air demand, such pressure maintains higher level always, and fan energy use is caused when all valves all push
Significant wastage.
The hardware system of feedback+superior performance, the control model are saved feedforward and bio processing module, are solved to online
Instrument excessively relies on and the accuracy problems of biology modules.But the system needs the higher control energy to valve and air blower
The air quantity of the aperture of valve and air blower be able to will be adjusted to after meeting change of water quality by power, the i.e. system in the short period of time
Air demand and energy saving purpose needed for biological tank.The representative control system of this control model is German Bing get companies
The VACOMASS control systems of (BINDER ENGINEERING).
In addition, both the above technology is for in-line meter（Feed water flow gauge, air flow meter, the online ammonia nitrogen of water inlet, COD
Measuring instrument etc.）, biology modules and air compressor control hardware device requirement it is high, so control system input price at initial stage is held high
It is expensive, it is later maintenance heavy workload, of high cost, if occurrence of equipment hardware, communication network, in-line meter failure, system are at
Semiparalysis state.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of method that can accurately control biological tank to be aerated.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of sewage disposal accurate aeration method is designed, is comprised the following steps：
（1）Pending sewage is incorporated into more than two biological tanks, the biological tank is supporting to be provided with aerating system, institute
Stating aerating system includes controller, blower unit and the aerated conduit being separately positioned in the biological tank, in each biological tank
Aerated conduit be connected by isocon with extraneous air manifold, be respectively equipped with butterfly on the corresponding isocon of each biological tank
Valve, is provided with pressure gauge, blower unit connection corresponding with the air header, in the biology on the air header
Online dissolved oxygen meter is respectively equipped with pond；The butterfly valve, blower unit, pressure gauge and online dissolved oxygen meter respectively with
The controller, which corresponds to, to be electrically connected；
（2）Dissolved oxygen concentration DO in each biological tank is measured by online dissolved oxygen meter, and is calculated by controller molten
The average value A of oxygen concentration every 20 seconds change rates within previous minute is solved, the constant interval of dissolved oxygen concentration DO is set：Minimum value
MIN ＜ lower limit L ＜ upper limit value H ＜ maximums MAX；
（3）The current aperture that each biological tank corresponds to butterfly valve is obtained, the aperture section where the butterfly valve according to table 1 below, obtains
The butterfly valve amplitude of accommodation and time interval：
（4）According to following condition regulating butterfly valve apertures：
1. as DO ＜ MIN, if average value A >=0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life
The butterfly valve opening in thing pond remains unchanged；If A ＜ 0.03, the butterfly valve is raised according to time interval and the amplitude of accommodation shown in upper table 1
Aperture；
2. as MIN≤DO ＜ L, if average value A >=0 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life
The butterfly valve opening in thing pond remains unchanged；If A ＜ 0, opening for the butterfly valve is raised according to time interval and the amplitude of accommodation shown in upper table 1
Degree；
3. as L≤DO≤H, if the average value A ＞ 0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, according to
Time interval and the amplitude of accommodation lower the aperture of the butterfly valve shown in upper table 1；If A ＜ -0.03, according between the time shown in upper table 1
Every the aperture that the butterfly valve is raised with the amplitude of accommodation；If -0.03≤A≤0.03, the butterfly valve of the biological tank keeps aperture to keep not
Become；
4. as H ＜ DO≤MAX, if average value A≤0 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life
The butterfly valve opening in thing pond remains unchanged；If A ＞ 0, opening for the butterfly valve is lowered according to time interval and the amplitude of accommodation shown in upper table 1
Degree；
5. as DO ＞ MAX, if average value A≤- 0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life
The butterfly valve in thing pond keeps aperture to remain unchanged；If A ＞ -0.03, being lowered according to time interval shown in upper table 1 and the amplitude of accommodation should
The aperture of butterfly valve；
（5）Aeration quantity setting air manifold pressure desired value according to needed for each biological tank, the air that pressure gauge is detected are total
Pipe pressure actual value is compared with the desired value, when the two is inconsistent, by the unlatching quantity and the air blast that control air blower
Machine guide vane opening adjusts the gas output of blower unit, so as to adjusting air header pressure to desired value；
（6）Enter next step sewage disposal process after the completion of aeration.
Preferably, step（5）The adjusting method of middle air manifold pressure desired value is：
A. the butterfly valve opening auxiliary limit value for setting each biological tank first is F0-F1, when butterfly valve opening reaches F0 and still needs to lower
When, i.e., the biological tank is decline solicited status；When butterfly valve opening reaches F1 and still needs to upper timing, i.e., the biological tank is asked to rise
State；
B. every ten minutes solicited status for obtaining a biological tank, will when there is at least two biological tanks to rise solicited status
Air header pressure target value raises an amplitude P0；It is when there is at least two biological tanks to decline solicited status, air is total
Pipe pressure desired value lowers an amplitude P0；
C. when the dissolved oxygen concentration DO ＜ minimum value MINs in the biological tank for having more than half, on air header pressure target value
Adjust an amplitude P1.
Preferably, the butterfly valve opening auxiliary limit value：F0 values are that 25%~60%, F1 values are 60%~100%.
Preferably, the amplitude of accommodation P0 of the air header pressure is 0.3~0.5 kPa；The air header pressure
Amplitude of accommodation P1 is 0.7~1 kPa.
Preferably, step（5）In, it is exhausted as D if the difference between the actual value and desired value of air header pressure is D
During to being worth≤0.2 kPa, blower unit does not act；As 0.2 kPa of the absolute value ＞ of D, blower unit acts, will
Air header pressure actual value is adjusted to desired value.
Preferably, step（2）Described in dissolved oxygen concentration average value A of every 20 seconds change rates within previous minute calculating
Method is：
If dissolved oxygen concentration is A0, A1, A2, A3 every the measured value of 20 seconds within previous minute, then dissolved oxygen concentration is previous
The average value of every 20 seconds change rates in minute。
Preferably, the constant interval value of the dissolved oxygen concentration DO is：Minimum value MIN is 0.8~1.2mg/L, lower limit
Value L is 1.5~1.8mg/L, and upper limit value H is 2~2.3mg/L, and maximum MAX is 2.5~3mg/L.
Preferably, air flow meter is installed at the rear portion of each butterfly valve.
Preferably, the online dissolved oxygen meter is arranged on the end of biological tank aerated conduit.
The beneficial effects of the present invention are：
1. traditional aeration method is typically to adjust tolerance distribution according to the air demand calculated, but is needed since biological tank is actual
Tolerance not only has outside the Pass with amount of inlet water, water quality, water temperature, sludge concentration, the length of efficiency, aerating pipelines also with aeration head,
The many factors such as the flow velocity of biological tank and admixture are related, and often air demand calculates very big with actual deviation.In order to solve water
The continuous change of amount, water quality, water temperature can cause the continually changing problem of aerating system oxygen demand, basis in aeration method of the present invention
The change of the dissolved oxygen concentration of actual measurement, is distributed to adjust tolerance in real time by butterfly valve, realizes accurate aeration, overcome traditional exposure
The defects of deviation existing for gas method is big, high energy consumption.
2. technical solution of the present invention is according to the design feature of air butterfly valve, dynamic in different interval ranges there is provided butterfly valve
Make amplitude and control interval time, rationally adjust tolerance, while solve the problems, such as dissolved oxygen response lag, avoid frequently
Regulating butterfly valve, makes system pressure stablize relatively, that is, reaches accurate control effect, and extends the service life of equipment, finally reaches
Energy saving purpose is arrived.
3. technical solution of the present invention is by setting 4 limit values of dissolved oxygen concentration DO excursions, 5 sections, according to not
Different air butterfly valve action rules are set with interval range, dissolved oxygen is accurately controlled in certain scope, and reducing
When do not interfere with effluent quality, when rise, will not waste aeration quantity.
4. butterfly valve opening can be also set to aid in limit value F0-F1 in technical solution of the present invention, when a certain number of biological tank butterflies
Valve opening reaches auxiliary lower limit and still needs to lower timing, and it is gentle to reduce the pressure of whole air header directly to adjust air header pressure
Amount, still needs to upper timing when a certain number of biological tank butterfly valve openings reach the auxiliary upper limit, directly adjusts air header pressure to carry
The pressure and tolerance of high whole air header, the setting of auxiliary lower limit F0 make aeration quantity in the case where meeting biological tank demand,
Manifold pressure is allowed to keep minimum, most energy saving state；The setting of auxiliary upper limit F1 make it that a part of biological tank aeration quantity is full
In the case of foot, another part biological tank is allowed to be unlikely to excess aeration.
5. accurate aeration system of the prior art, air header pressure range very little or Isobarically Control is leaned on completely,
Make within the scope of pressure maintains, wind turbine power consumption can be caused at this time by reducing air pipeline valve opening when dissolved oxygen is higher
Increase, energy consumption is very big.The air header pressure of technical solution of the present invention control system can be adjusted in real time, allow air header
Pressure remains at minimum state in the case where meeting tolerance demand.Not only reach the effect of accurate aeration, but also reach section
The purpose that can be lowered consumption.
6. during under normal circumstances, by air blower tolerance adjusting air header pressure, as long as manifold pressure changes, air blast
Machine will follow by action, but since the action of each butterfly valve can all cause the slight change of air header pressure；Traditional
In control mode, any trickle change of air header pressure can all cause air blower to act, and air blower is frequently adjusted guide vane
Aperture, energy consumption is very big, and the loss to air blower is also very big, by setting air blower operating pressure blind area to solve in the present invention
This problem, the difference between the actual value and desired value of air header pressure are less than or equal to 0.2 kPa, that is, work as air header
During the amplitude of variation very little of pressure, blower unit does not act, only when the amplitude of variation of air header pressure is more than the area
Between when, blower unit can just act, and the operating frequency of air blower is greatly reduced, and can either extend the service life of air blower,
Achieve the purpose that again energy saving.
7. current existing accurate aeration technology, requires equipped with air mass flow each aerobic gallery of each biological tank
Meter, online dissolved oxygen instrument and air electric butterfly valve, and air temperature sensor, cooling-water temperature sensor etc., equipment purchase cost and
Maintenance cost is high.Technical solution of the present invention optimizes control system, it is only necessary to installs pressure gauge, each biological tank peace in air header
Online dissolved oxygen instrument, motorized adjustment butterfly valve and an air flow meter are filled, reduces the dependence to in-line meter, saves significantly
About equipment purchase and later maintenance cost.
8. technical solution of the present invention is suitable for the upgrading of each large and medium-sized sewage treatment plant, can be in existing utility
On the basis of transformed, not only facilitate and realize, but also control is simple, main is very energy saving.
Brief description of the drawings
Fig. 1 is the schematic diagram of control system used in sewage disposal accurate aeration method of the present invention.
Embodiment
Illustrate the embodiment of the present invention with reference to embodiment, but following embodiments are used only to describe in detail
The present invention, does not limit the scope of the invention in any way.Involved equipment component is as without especially in the examples below
Illustrate, be conventional equipment element；The involved raw material of industry is commercially available regular industrial raw material unless otherwise instructed.
Embodiment 1：A kind of sewage disposal accurate aeration method, comprises the following steps：
（1）Pending sewage is incorporated into four biological tanks, the biological tank is supporting to be provided with aerating system, the aeration
System includes controller, blower unit and the aerated conduit being separately positioned in the biological tank, the aeration in each biological tank
Pipeline is connected by isocon with extraneous air manifold, and butterfly valve is respectively equipped with the corresponding isocon of each biological tank,
Pressure gauge, blower unit connection corresponding with the air header, in the biological tank are provided with the air header
It is respectively equipped with online dissolved oxygen meter；The butterfly valve, blower unit, pressure gauge and online dissolved oxygen meter respectively with it is described
Controller, which corresponds to, to be electrically connected；Air flow meter is installed at the rear portion of each butterfly valve；Wherein, the online dissolved oxygen meter is set
Put in the end of biological tank aerated conduit.The schematic diagram of the control system is as shown in Figure 1, controller includes master controller, sub-control
Device processed and the substation controller equal with biological tank quantity, the online dissolved oxygen meter and butterfly valve of each biological tank correspond to respectively
Connect a sub- station control, substation controller connection corresponding with the sub-controller, the air manometer and institute
State sub-controller and correspond to connection；The sub-controller passes through the connection corresponding with the blower unit of MCP interfaces；The master controller
Communicated between the sub-controller by Ethernet.Master controller, sub-controller and substation controller are Siemens
The PLC controller of 6ES7 series.
Sub-controller is connected by MCP interfaces with blower unit, for obtaining the status information of air blower and controlling drum
The action of wind turbine, each biological tank set a sub- station control, for the data of online dissolved oxygen meter and butterfly valve to be passed
Transport to sub-control station, the pressure gauge information on air header is also transmitted to sub-controller, and master controller obtains sub-control by Ethernet
Each item data that station collects, carries out data processing and sends corresponding control signal, control the operation of whole system.
（2）Dissolved oxygen concentration DO in each biological tank is measured by online dissolved oxygen meter, and passes through controller meter
The average value A of dissolved oxygen concentration every 20 seconds change rates within previous minute is calculated, the constant interval of dissolved oxygen concentration DO is set：It is minimum
Value MIN ＜ lower limit L ＜ upper limit value H ＜ maximums MAX；
Wherein, the constant interval value of dissolved oxygen concentration DO is：Minimum value MIN is 1mg/L, and lower limit L is 1.5mg/L, the upper limit
Value H is 2mg/L, and maximum MAX is 2.5mg/L.
Dissolved oxygen concentration computational methods of the average value A of every 20 seconds change rates within previous minute are：
If dissolved oxygen concentration is A0, A1, A2, A3 every the measured value of 20 seconds within previous minute, then dissolved oxygen concentration is previous
The average value of every 20 seconds change rates in minute。
（3）Obtain the current aperture that each biological tank corresponds to butterfly valve, the aperture section where the butterfly valve according to table 1 below,
Obtain the butterfly valve amplitude of accommodation and time interval：
（4）According to following condition regulating butterfly valve apertures：
1. as DO ＜ MIN, if average value A >=0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life
The butterfly valve opening in thing pond remains unchanged；If A ＜ 0.03, the butterfly valve is raised according to time interval and the amplitude of accommodation shown in upper table 1
Aperture；
2. as MIN≤DO ＜ L, if average value A >=0 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life
The butterfly valve opening in thing pond remains unchanged；If A ＜ 0, opening for the butterfly valve is raised according to time interval and the amplitude of accommodation shown in upper table 1
Degree；
3. as L≤DO≤H, if the average value A ＞ 0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, according to
Time interval and the amplitude of accommodation lower the aperture of the butterfly valve shown in upper table 1；If A ＜ -0.03, according between the time shown in upper table 1
Every the aperture that the butterfly valve is raised with the amplitude of accommodation；If -0.03≤A≤0.03, the butterfly valve of the biological tank keeps aperture to keep not
Become.
4. as H ＜ DO≤MAX, if average value A≤0 of dissolved oxygen concentration every 20 seconds change rates within previous minute,
The butterfly valve opening of the biological tank remains unchanged；If A ＞ 0, the butterfly valve is lowered according to time interval and the amplitude of accommodation shown in upper table 1
Aperture；
5. as DO ＞ MAX, if average value A≤- 0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life
The butterfly valve in thing pond keeps aperture to remain unchanged；If A ＞ -0.03, being lowered according to time interval shown in upper table 1 and the amplitude of accommodation should
The aperture of butterfly valve；
（5）Aeration quantity setting air manifold pressure desired value according to needed for each biological tank, the air that pressure gauge is detected are total
Pipe pressure actual value is compared with the desired value, when the two is inconsistent, by the unlatching quantity and the air blast that control air blower
Machine guide vane opening adjusts the gas output of blower unit, so as to adjusting air header pressure to desired value；
Wherein, the adjusting method of air header pressure target value is：
A. the butterfly valve opening auxiliary limit value for setting each biological tank first is F0-F1, when butterfly valve opening reaches F0 and still needs to lower
When, i.e., the biological tank is decline solicited status；When butterfly valve opening reaches F1 and still needs to upper timing, i.e., the biological tank is asked to rise
State；Wherein F0=40%, F1=80%.In actual application, due to the position point of biological tank, air header, blower unit
Cloth is different, it is possible that the length of different biological tank aerating pipelines is different, the other aeration effect of each biological tank aeration head
Difference is also likely to be present, therefore the butterfly valve opening auxiliary limit value of each biological tank can set different values.Aid in the setting of lower limit
Make aeration quantity in the case where meeting the biological tank demand, allow manifold pressure to keep minimum, most energy saving state；Aid in the upper limit
Setting makes in the case of meeting other biological pond aeration quantity, allows the biological tank to be unlikely to excess aeration.
B. every ten minutes solicited status for obtaining a biological tank, are to rise solicited status when there is at least two biological tanks
When, air header pressure target value is raised into an amplitude P0；When there is at least two biological tanks to decline solicited status, by sky
Gas manifold pressure desired value lowers an amplitude P0；Wherein P0=0.3 kPa.
C. when the dissolved oxygen concentration DO ＜ minimum value MINs in the biological tank for having more than half, air header pressure target
Value one amplitude P1 of up-regulation, wherein P1=0.7 kPa.
During the adjusting of air header pressure, if the difference between the actual value and desired value of air header pressure is D,
When absolute value≤0.2 kPa of D, blower unit does not act；As 0.2 kPa of the absolute value ＞ of D, blower unit occurs
Action, air header pressure actual value is adjusted to desired value.That is, one air blower action blind area of setting, works as air
Small change occurs for manifold pressure（Within 0.2 kPa）When, air blower will not be produced because of the pressure change of air header
Lively to make, only when the changing value of air header pressure is more than 0.2 kPa, air blower ability acts, which reduces
The operating frequency of air blower, had not only extended the service life of air blower, but also had achieveed the purpose that energy saving.
（6）Enter next step sewage disposal process after the completion of aeration.
The working method of sewage disposal accurate aeration method of the present invention is：
Pending sewage is introduced into biological tank first, quantity, the arrangement aerated conduit of biological tank can be set as the case may be,
4 biological tanks are provided with embodiment 1, online dissolved oxygen meter is provided with each biological tank, aeration is set in biological tank
Pipeline, aerated conduit are connected by isocon with extraneous air manifold, and butterfly valve is equipped with the corresponding isocon of each biological tank.
Before being aerated, the upper lower limit value of air header pressure is set by the calculating of air demand, in aeration process
Air header pressure is adjusted in the range of limitation, by the calculating of each biological tank air demand and total air demand, set each raw
The butterfly valve opening section in thing pond, makes the butterfly valve of each biological tank be adjusted in interval range.Such as：When the dissolved oxygen of a biological tank
During concentration DO ＜ 1mg/L, judge the aperture section of butterfly valve, if butterfly valve opening between 0~30%, and the dissolving of the biological tank
Average value A >=0.03 of oxygen concentration every 20 seconds change rates within previous minute, then the butterfly valve opening of the biological tank remain unchanged；If
The aperture of A ＜ 0.03, then butterfly valve up-regulation 1% in every 120 seconds.When the dissolved oxygen concentration DO of a biological tank is in 1mg/L~1.5mg/
When in the range of L, the aperture section of disconnected butterfly valve is judged, if butterfly valve opening, between 60~100%, and dissolved oxygen concentration is previous
Minute in every 20 seconds change rates average value A >=0, then the butterfly valve opening of the biological tank remain unchanged；If A ＜ 0, the butterfly valve is every
The aperture of up-regulation 10% in 1000 seconds.And so on, according to above-mentioned steps（4）In method carry out the aperture of regulating butterfly valve.
When tolerance is unable to reach balance by butterfly valve adjusting in system, system adjustment air header pressure comes matching system institute
Air total amount is needed, so as to reach balanced intelligent control of each biological tank dissolved oxygen in the range of.The regulation and control of air header pressure
Depending on rising, decline solicited status according to biological tank, the butterfly valve opening auxiliary limit value F0-F1 of each biological tank is set first
（As 40%~80% or other）, when butterfly valve opening reaches F0 and still needs to lower timing, i.e., the biological tank is decline solicited status；Work as butterfly
Valve opening reaches F1 and still needs to timing, i.e., the biological tank is rising solicited status；The biological tank of acquisition in every ten minutes is asked
State is sought, when there are at least two biological tanks to rise solicited status, air header pressure target value is raised into an amplitude
（0.3 kPa）；When there are at least two biological tanks to decline solicited status, air header pressure target value is lowered（0.3 thousand
Pa）；When the dissolved oxygen concentration DO ＜ minimum value MINs in the biological tank for having more than half, illustrate air header insufficient pressure with
Meet the air demand of most biological tank, at this moment air header pressure target value raises a larger amplitude（0.7 kPa）.
After air header pressure target value changes, by controlling air blower to open quantity and adjusting air blower guide vane opening
To adjust air header pressure, when air header pressure actual value changes, air blower can act, by air header pressure
Power is adjusted to consistent with desired value.But the slight change of air header pressure causes air blower frequent movement in order to prevent, set
One air blower acts blind area, and when the changing value of air header pressure is less than or equal to 0.2 kPa, air blower does not move
Make, only when the changing value of air header pressure is more than 0.2 kPa, air blower ability acts, and removes adjustment air header
Pressure.The frequent movement of air blower can so be greatly decreased, achieve the purpose that to extend air blower service life and energy saving.
Aeration control method of the present invention sets the upper lower limit value of air header pressure, makes air by the calculating of air demand
Manifold pressure is adjusted in the range of limitation, by the calculating of each biological tank air demand and total air demand, sets each biological tank
Butterfly valve opening section, makes the butterfly valve of each biological tank be adjusted in interval range；When tolerance is adjusted and can not reached by butterfly valve in system
During to balance, system adjustment air header pressure carrys out air total amount needed for matching system, so as to reach each biological tank dissolved oxygen
Balanced intelligent control in the range of.
The present invention is described in detail above in conjunction with embodiment, but person of ordinary skill in the field can manage
Solution, on the premise of present inventive concept is not departed from, can also form each design parameter make a change in above-described embodiment
Multiple specific embodiments, are the common excursion of the present invention, are no longer described in detail one by one herein.
Claims (10)
- A kind of 1. sewage disposal accurate aeration method, it is characterised in that comprise the following steps：（1）Pending sewage is incorporated into more than two biological tanks, the biological tank is supporting to be provided with aerating system, institute Stating aerating system includes controller, blower unit and the aerated conduit being separately positioned in the biological tank, in each biological tank Aerated conduit be connected by isocon with extraneous air manifold, be respectively equipped with butterfly on the corresponding isocon of each biological tank Valve, is provided with pressure gauge, blower unit connection corresponding with the air header, in the biology on the air header Online dissolved oxygen meter is respectively equipped with pond；The butterfly valve, blower unit, pressure gauge and online dissolved oxygen meter respectively with The controller, which corresponds to, to be electrically connected；（2）Dissolved oxygen concentration DO in each biological tank is measured by online dissolved oxygen meter, and is calculated by controller molten The average value A of oxygen concentration every 20 seconds change rates within previous minute is solved, the constant interval of dissolved oxygen concentration DO is set：Minimum value MIN ＜ lower limit L ＜ upper limit value H ＜ maximums MAX；（3）The current aperture that each biological tank corresponds to butterfly valve is obtained, the aperture section where the butterfly valve according to table 1 below, obtains The butterfly valve amplitude of accommodation and time interval：（4）According to following condition regulating butterfly valve apertures：1. as DO ＜ MIN, if average value A >=0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life The butterfly valve opening in thing pond remains unchanged；If A ＜ 0.03, the butterfly valve is raised according to time interval and the amplitude of accommodation shown in upper table 1 Aperture；2. as MIN≤DO ＜ L, if average value A >=0 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life The butterfly valve opening in thing pond remains unchanged；If A ＜ 0, opening for the butterfly valve is raised according to time interval and the amplitude of accommodation shown in upper table 1 Degree；3. as L≤DO≤H, if the average value A ＞ 0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, according to Time interval and the amplitude of accommodation lower the aperture of the butterfly valve shown in upper table 1；If A ＜ -0.03, according between the time shown in upper table 1 Every the aperture that the butterfly valve is raised with the amplitude of accommodation；If -0.03≤A≤0.03, the butterfly valve of the biological tank keeps aperture to keep not Become；4. as H ＜ DO≤MAX, if average value A≤0 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life The butterfly valve opening in thing pond remains unchanged；If A ＞ 0, opening for the butterfly valve is lowered according to time interval and the amplitude of accommodation shown in upper table 1 Degree；5. as DO ＞ MAX, if average value A≤- 0.03 of dissolved oxygen concentration every 20 seconds change rates within previous minute, the life The butterfly valve in thing pond keeps aperture to remain unchanged；If A ＞ -0.03, being lowered according to time interval shown in upper table 1 and the amplitude of accommodation should The aperture of butterfly valve；（5）Aeration quantity setting air manifold pressure desired value according to needed for each biological tank, the air that pressure gauge is detected are total Pipe pressure actual value is compared with the desired value, when the two is inconsistent, by the unlatching quantity and the air blast that control air blower Machine guide vane opening adjusts the gas output of blower unit, so as to adjusting air header pressure to desired value；（6）Enter next step sewage disposal process after the completion of aeration.
- 2. sewage disposal accurate aeration method according to claim 1, it is characterised in that step（5）Middle air header pressure The adjusting method of power desired value is：A. the butterfly valve opening auxiliary limit value for setting each biological tank first is F0-F1, when butterfly valve opening reaches F0 and still needs to lower When, i.e., the biological tank is decline solicited status；When butterfly valve opening reaches F1 and still needs to upper timing, i.e., the biological tank is asked to rise State；B. every ten minutes solicited status for obtaining a biological tank, will when there is at least two biological tanks to rise solicited status Air header pressure target value raises an amplitude P0；It is when there is at least two biological tanks to decline solicited status, air is total Pipe pressure desired value lowers an amplitude P0；C. when the dissolved oxygen concentration DO ＜ minimum value MINs in the biological tank for having more than half, on air header pressure target value Adjust an amplitude P1.
- 3. sewage disposal accurate aeration method according to claim 2, it is characterised in that the butterfly valve opening auxiliary limit Value：F0 values are that 25%~60%, F1 values are 60%~100%.
- 4. sewage disposal accurate aeration method according to claim 2, it is characterised in that the tune of the air header pressure Section amplitude P0 is 0.3~0.5 kPa；The amplitude of accommodation P1 of the air header pressure is 0.7~1 kPa.
- 5. sewage disposal accurate aeration method according to claim 2, it is characterised in that step（5）In, if air header Difference between the actual value and desired value of pressure is D, and when absolute value≤0.2 kPa of D, blower unit does not act； As 0.2 kPa of the absolute value ＞ of D, blower unit acts, and air header pressure actual value is adjusted to desired value.
- 6. sewage disposal accurate aeration method according to claim 1, it is characterised in that step（2）Described in dissolved oxygen Concentration computational methods of the average value A of every 20 seconds change rates within previous minute are：If dissolved oxygen concentration is A0, A1, A2, A3 every the measured value of 20 seconds within previous minute, then dissolved oxygen concentration is previous The average value of every 20 seconds change rates in minute。
- 7. sewage disposal accurate aeration method according to claim 1, it is characterised in that the change of the dissolved oxygen concentration DO Changing section value is：Minimum value MIN is 0.8~1.2mg/L, and lower limit L is 1.5~1.8mg/L, and upper limit value H is 2~2.3mg/ L, maximum MAX are 2.5~3mg/L.
- 8. sewage disposal accurate aeration method according to claim 1, it is characterised in that installed at the rear portion of each butterfly valve There is air flow meter.
- 9. sewage disposal accurate aeration method according to claim 1, it is characterised in that the online dissolved oxygen meter It is arranged on the end of biological tank aerated conduit.
- 10. sewage disposal accurate aeration method according to claim 1, it is characterised in that the controller is Siemens The PLC controller of 6ES7 series.
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| CN108678986A (en) * | 2018-05-18 | 2018-10-19 | 清华大学 | The control method and device of sewage treatment plant's air blower automatic adjustment and marshalling operation |
| CN108751401A (en) * | 2018-06-22 | 2018-11-06 | 北京碧水源科技股份有限公司 | A kind of MBR process integrations blower system and its operation method |
| CN109111030A (en) * | 2018-08-27 | 2019-01-01 | 重庆固润科技发展有限公司 | Integrated sewage disposal intelligence control system and control method |
| CN109534493A (en) * | 2019-01-17 | 2019-03-29 | 重庆市李家沱排水有限公司 | A kind of the aeration precise control system and its control method of sewage treatment |
| CN109592804A (en) * | 2018-12-28 | 2019-04-09 | 中原环保股份有限公司 | A kind of sewage treatment approach follows excellent accurate aeration method |
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| CN111848455A (en) * | 2020-08-17 | 2020-10-30 | 万华化学集团股份有限公司 | Method for reducing chromaticity of isocyanate product and automatic control method for gas-phase extraction flow of isocyanate rectifying tower |
| CN111848455B (en) * | 2020-08-17 | 2023-05-30 | 万华化学集团股份有限公司 | Method for reducing chromaticity of isocyanate product and automatic control method for gas phase extraction flow of isocyanate rectifying tower |
| CN112010436A (en) * | 2020-08-25 | 2020-12-01 | 广州众行环保科技有限公司 | Method for accurately controlling dissolved oxygen in sewage treatment process |
| CN114956360A (en) * | 2022-08-02 | 2022-08-30 | 江苏莱通环境科技有限公司 | Sewage treatment aeration oxygenation control method based on hill climbing algorithm |
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| 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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