CN104355477B - Sewage treatment plant's chemical dephosphorization automaton and control method - Google Patents
Sewage treatment plant's chemical dephosphorization automaton and control method Download PDFInfo
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- CN104355477B CN104355477B CN201410460613.3A CN201410460613A CN104355477B CN 104355477 B CN104355477 B CN 104355477B CN 201410460613 A CN201410460613 A CN 201410460613A CN 104355477 B CN104355477 B CN 104355477B
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Abstract
The invention discloses a kind of sewage treatment plant's chemical dephosphorization automaton and control method, described device is provided with preliminary sedimentation tank, biological reaction pool and the second pond sequentially connected, the water inlet pipe of second pond connects with dosing pump, medicine storing pot and drug feeding pipeline, and is provided with online effusion meter, medicament effusion meter, online PLC and converter, online phosphate determination instrument and controller；The step of the method that described control device is controlled is perfect, and it is careful to calculate, and controls flexibly, have preferable phosphor-removing effect, and efficiency is high, and automaticity is the highest.The present invention is especially suitable for sewage treatment plant's chemical dephosphorization technique, trail run achieves extraordinary effect.
Description
Technical field
The invention belongs to a kind of sewage disposal technology, a kind of sewage chemical dephosphorization processing controls technology, particularly basis
Amount of inlet water and the dosage of Inlet and outlet water phosphorus concentration timely automated adjustment chemical dephosphorization medicament, make the dephosphorization treatment effect of sewage more
Good device and method.
Background technology
At home a lot of sewage treatment plants the most all uses biological phosphate-eliminating be lead, chemical dephosphorization is that auxiliary method is as sewage
The phosphorus removing method processed.Traditional chemical dephosphorization generally adds Dephosphorization reagent at Aeration tank end, and its addition method includes: constant basis
Add, add according to the feedforward of influent load, according to methods such as the phosphorus concentration feedback control of dispensing point add.Due to sewage
There is bigger seasonality and day-night change in treatment plant's water inlet phosphorus load, uses these methods to exist greatly in actual moving process
Some problems: 1, constant basis adds the change to influent load and can not promptly and accurately react, it is impossible to timely to dosage
Make adjustment, it is often necessary to raising dosage is with adaptive peak load, and the medicament utilization rate making chemical dephosphorization is low, adds resource
Consume, improve processing cost；2, the undue instrument that relies on causes system operation unreliable: throw according to the feedforward of influent load
Add and add according to the feedback control of dispensing point phosphorus concentration all place one's entire reliance upon into water phosphorus concentration or toss area phosphorus concentration real-time
Monitoring, and phosphorus on-line monitoring instrument cost of investment is high, maintenance requirement high, the water inlet of phosphorus concentration monitoring point and Aeration tank end water sample
In owing to containing polluters such as substantial amounts of mud, causing the maintenance of phosphorus in-line meter to dramatically increase, sewage treatment plant is often
It is difficult to safeguard in time, makes chemical phosphorus removal system be not normally functioning.Based on problem above analysis, need existing sewage disposal
Chemical dephosphorization control system improves, and makes the dosage of Dephosphorization reagent obtain accurate, timely and stable control.
Summary of the invention
It is an object of the invention to solve above-mentioned technical problem, it is provided that a kind of sewage treatment plant chemical dephosphorization automatically controls dress
Put and control method.This control apparatus and method are to remove according to amount of inlet water and Inlet and outlet water phosphorus concentration timely automated adjustment chemistry
The dosage of phosphorus medicament, it is possible to ensure that the added amount of chemical of sewage chemical dephosphorization processing unit obtains accurately controlling timely, and
Make chemical dephosphorization process process stabilizing to run efficiently.
It is an object of the invention to be realized by following technical proposals: sewage treatment plant's chemical dephosphorization automaton, if
Having preliminary sedimentation tank, biological reaction pool and the second pond sequentially connected, preliminary sedimentation tank is provided with water inlet pipe, and second pond is provided with water inlet pipe and draining
Pipe, the water inlet pipe of second pond connects with dosing pump, medicine storing pot and drug feeding pipeline, it is characterized in that: fill on the water inlet pipe of preliminary sedimentation tank
Having online effusion meter, equipped with medicament effusion meter in the drug feeding pipeline that dosing pump connects with second pond, described dosing pump is equipped with control
The online PLC of its flow and converter, equipped with online phosphate determination instrument on the drainage pipeline of second pond, be additionally provided with control
Device, this controller and described online effusion meter and online PLC and converter, medicament effusion meter, online phosphate determination instrument are carried out
Signal and control connect.
The method that above-mentioned sewage treatment plant sewage chemical dephosphorization automaton is controlled, is characterized in that including following
Step:
1) provide data according to pharmaceutical supply business, determine drug concentration Cy, Dephosphorization reagent molecular weight Me, Dephosphorization reagent density
ρ；According to Effluent criteria requirement, determine secondary clarifier effluent phosphorus concentration setting value Ceff；Determine that trivalent metal salt and chemical agent go
The mol ratio coefficient f of dephosphorization is 1.2；Biological reaction pool is carried out once sampling in manual 24 hours, detects phosphorus concentration Cin_
0,24 arrays obtained are as follows for presetting water inlet phosphorus concentration control array: Cin_0 (i), and wherein i is 1-24；In the controller
Input above-mentioned data；
2) the d days manual inspection biological reaction pool inlet COD concentration CODin_d；The the one d days manual at t detection biology
Reaction tank water inlet phosphorus concentration Cin_d (t), wherein, d is that system is run the d days, calculates and the deviation of the array that prestores: Δ _ d=
Cin_d (t)-Cin_0 (t), unit is mg/L, and preset water inlet phosphorus concentration controlling array changing value is Δ _ d (mg/L), again gives birth to
The phosphorus concentration that becomes to intake the same day controls array, i.e. Cin_d (i)=Cin_0 (i)+Δ _ d；Above-mentioned data input control system；
3) gather feed water flow gauge signal Q (t) and calculate the flow of inlet water of input controller；
Qk (t)=Q (t-m) formula (1)
Qk (t)-t chemical feeding points flow (m3/s)；
Q (t-m)-(t-m) moment, flow of inlet water (m3/s)
M-flow lag coefficient, (h)
4) the biological reaction pool water inlet phosphorus concentration corresponding to current time chemical feeding points is calculated
Cdos (t)=Cin_d (t-n) formula (2)
In formula, Cdos (t)-chemical feeding points phosphorus concentration controls array (mg/L)；
Cin_d (t-n)-biological reaction pool water inlet phosphorus concentration controls array (mg/L)
N-concentration lag coefficient, (h)
5) chemical feeding quantity needed is calculated according to formula (3)
In formula:
Qc-dosing flow, L/s
Qt-flow of inlet water, m3/s
Cdos (t)-chemical feeding points phosphorus concentration, mg/L
F-trivalent metal salt and chemical agent go the mol ratio coefficient of dephosphorization to be 1.2
Cy-drug concentration, %
Ceff-secondary clarifier effluent phosphorus concentration setting value, mg/L
Me-Dephosphorization reagent molecular weight, g/mol
ρ-Dephosphorization reagent density, kg/L
6) operating frequency of dosing pump is calculated according to formula (4)；
Fhz=qc/ (F1*F2*F3) formula (4)
In formula: fhz=electric machine frequency, hz
Qc=dosing flow, L/s
F1=dosing pump flow and revolution speed ratio
F2=revolution speed and motor speed ratio
F3=motor speed and frequency ratio
7) frequency values of converter is set according to calculated operating frequency；
8) the flow value qon of taken at regular intervals dosing effusion meter, compares with formula (3) value of calculation, when deviation is more than m%
Time, adjust the coefficient F1 in formula (4), until deviation is less than n%；
9) gather phosphorus concentration in-line meter data, calculate daily mean Ceff-av every day, when this value is higher than water outlet phosphorus concentration
The p% of setting value Ceff, in formula 3, trivalent metal salt and chemical agent go the mol ratio coefficient f of dephosphorization to increase r%；When this value
Less than the p% of water outlet phosphorus concentration value, in formula 3, trivalent metal salt and chemical agent go the mol ratio coefficient f of dephosphorization automatically to reduce
R%.
10) gathering phosphorus concentration in-line meter data, periodic analysis two settles out the situation of change of water phosphorus concentration: when certain moment two
The water phosphorus concentration that settles out is the most higher, i.e. 7 days have more than s days higher than water outlet phosphorus concentration setting value w% time, heighten biological reaction pool
Water inlet phosphorus concentration controls in array the 1% of corresponding moment phosphorus concentration setting value；When certain moment two water phosphorus concentration that settles out is the most on the low side,
Having in i.e. 7 days more than s days and be less than water outlet phosphorus concentration setting value u%, it is right to reduce in biological reaction pool water inlet phosphorus concentration control array
Should the v% of moment phosphorus concentration value
11) regenerate into water phosphorus concentration control array；
12) 2 are repeated)～11) step
The reliable flow of inlet water of cardinal principle utility of this device is counted as mainly inputting for this control system, usability
Can reliably converter as the main performance element of this control system, then utilize influent concentration exist regular change,
And biological respinse cell system possesses certain cushioning effect to the change of water inlet phosphorus load, in conjunction with the manual biological respinse measured
Pond water inlet phosphorus concentration data and secondary clarifier effluent online phosphorus concentration data the most automatically adjust water inlet phosphorus concentration and control array, according to
Dosing flow online data adjusts the parameter preset of dosing pump converter the most automatically.
Beneficial effects of the present invention: using this device to carry out chemical dephosphorization and automatically control, city domestic sewage water outlet phosphorus is dense
Degree stability contorting is at below 1mg/l, thus ensures that the stably reaching standard of water outlet phosphorus, trivalent metal salt and chemical agent go rubbing of dephosphorization
You than stability contorting at below 1.5mol/mol.After being positioned over biological reaction pool due to the online concentration of phosphorus, more clean two settle out
At water, be positioned over biological reaction pool before and among compared with, the online maintenance workload of phosphorus have dropped more than 50%.This control
Even if system settles out water phosphorus concentration on-line computing model and the situation of the dosing effusion meter relatively low instrument deficient of the two reliability two
Under, rely on feed water flow gauge, converter, dosing pump and controller to remain to realize the most reliably controlling, make system stability notable
Improve.Therefore, the present invention has reliable and stable, and regulation in time, is safeguarded simple feature, and had good regulating effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
Embodiment: sewage treatment plant's chemical dephosphorization automaton, is provided with preliminary sedimentation tank 3, the biological respinse sequentially connected
Pond 4 and second pond 5, preliminary sedimentation tank is provided with water inlet pipe, and second pond is provided with water inlet pipe and drain pipe, the water inlet pipe of second pond and dosing pump
8, medicine storing pot 7 connects with drug feeding pipeline, and equipped with online effusion meter 2 on the water inlet pipe of preliminary sedimentation tank, dosing pump connects with second pond
Drug feeding pipeline on equipped with medicament effusion meter 9, described dosing pump, equipped with controlling online PLC and the converter 6 of its flow, sinks two
Equipped with online phosphate determination instrument 10 on the drainage pipeline in pond, it is additionally provided with controller 1, this controller and described online effusion meter
Carry out signal with online PLC and converter, medicament effusion meter, online phosphate determination instrument and control to connect.
The control method of above-mentioned control device is as follows:
1) providing data according to pharmaceutical supply business, determine that drug concentration Cy is 6%, Dephosphorization reagent molecular weight Me is 51g/
Mol, Dephosphorization reagent density p 1.22kg/L；According to Effluent criteria requirement, determine that secondary clarifier effluent phosphorus concentration setting value Ceff is state
60% i.e. 0.6mg/L of family's one-level B discharge standard；According to laboratory results, determine that trivalent metal salt and chemical agent go
The mol ratio coefficient f of dephosphorization is 1.2；Biological reaction pool is carried out once sampling in manual 24 hours, detects phosphorus concentration Cin_
0,24 arrays obtained are as follows for presetting water inlet phosphorus concentration control array: Cin_0 (i), and wherein i is 1-24；In the controller
Input above-mentioned data.
2) the 1st day manual inspection biological reaction pool inlet COD concentration CODin_1 is 360mg/L；1st day manual at 9
Carving detection biological reaction pool water inlet phosphorus concentration Cin_1 (9) is 3.5mg/L, calculates and the deviation of the array that prestores: Δ _ d=Cin_d
T ()-Cin_0 (t)=3.5-5.21=-1.71mg/L, preset water inlet phosphorus concentration controlling array changing value is-1.71mg/L, weight
Phosphorus concentration of intaking the newly-generated same day controls array, i.e. Cin_1 (i)=Cin_0 (i)-1.71；Above-mentioned data input control system.
3) gather feed water flow gauge signal Qt, input controller；
4) the biological reaction pool water inlet phosphorus concentration corresponding to current time chemical feeding points is calculated
Cdos (t)=Cin_d (t-4)
5) chemical feeding quantity needed is calculated
In formula
Qc-dosing flow, L/s
Qt-flow of inlet water, m3/s
Cdos (t)-water inlet phosphorus concentration, mg/L
F-trivalent metal salt and chemical agent remove the mol ratio coefficient of dephosphorization, take 1.2mol/mol
Cy-drug concentration, takes 6%
Ceff-water outlet phosphorus concentration setting value, takes 0.6mg/L
Me-Dephosphorization reagent molecular weight, takes 102/2=51g/mol
ρ-Dephosphorization reagent density, takes 1.22kg/L
6) operating frequency of dosing pump is calculated according to formula (4)；
In formula
F=electric machine frequency, hz
Qc=dosing flow, L/s
F1=dosing pump flow and revolution speed ratio,
F2=revolution speed and motor speed ratio, F2=0.26
F3=motor speed and frequency ratio, F3=60/2-50/f
7) frequency values of converter is set according to calculated operating frequency；
8) flow value of taken at regular intervals dosing effusion meter, compares with formula (3) value of calculation, when deviation is more than 5%,
Adjust the coefficient F1 in formula 4, until deviation is less than 5%.
9) gather water outlet phosphorus concentration in-line meter data, calculate daily mean every day, when this value sets higher than water outlet phosphorus concentration
The 20% of definite value, i.e. 0.72mg/L, in formula 3, trivalent metal salt and chemical agent go the mol ratio coefficient f of dephosphorization automatically to increase
1%；When this value is less than 20%, i.e. 0.48mg/L of setting value, in formula 3 trivalent metal salt and chemical agent go dephosphorization mole
Automatically 1% is reduced than coefficient f.
10) gathering phosphorus concentration in-line meter data, periodic analysis two settles out the situation of change of water phosphorus concentration: when certain moment two
The water phosphorus concentration that settles out is the most higher, i.e. 7 days have more than 4 days higher than water outlet phosphorus concentration setting value 10% time, i.e. 0.66mg/L, adjust
High biological reaction pool water inlet phosphorus concentration controls in array the 2% of corresponding moment phosphorus concentration value；When certain moment two settles out water phosphorus concentration
The most on the low side, i.e. 7 days have more than 4 days less than water outlet phosphorus concentration setting value 10% time, i.e. 0.54mg/L, reduce biological reaction pool
Water inlet phosphorus concentration controls in array the 2% of corresponding moment phosphorus concentration value.
11) regenerate into water phosphorus concentration control array；
12) 2 are repeated)～11) step.
This example is the best through running three months effects, and water outlet phosphorus concentration reduces 0.2mg/L, can be with stability contorting 0.6
± 0.1mg/l, trivalent metal salt and chemical agent go the mol ratio stability contorting of dephosphorization at 1.2mol/mol, and phosphorus is put online
The maintenance workload that is placed in second pond drainage pipeline compared with being positioned in biological reaction pool is from reducing to monthly 1 time 1 times a week, monthly
Saving pharmaceutical quantities 180 tons, count more than 60,000 yuan, phosphorus on-line maintenance takes saving two over thousands of yuan, and system stability significantly improves.
Claims (1)
1. a control method for sewage treatment plant's chemical dephosphorization automaton, is provided with preliminary sedimentation tank (3), the life sequentially connected
Thing reaction tank (4) and second pond (5), preliminary sedimentation tank is provided with water inlet pipe, and second pond is provided with water inlet pipe and drain pipe, the water inlet of second pond
Pipe connects with dosing pump (8), medicine storing pot (7) and drug feeding pipeline, equipped with online effusion meter (2) on the water inlet pipe of preliminary sedimentation tank, adds
Equipped with medicament effusion meter (9) in the drug feeding pipeline that Teat pipette connects with second pond, described dosing pump is equipped with controlling the online of its flow
PLC and converter (6), equipped with online phosphate determination instrument (10) on the drainage pipeline of second pond, be additionally provided with controller
(1), this controller and described online effusion meter and online PLC and converter, medicament effusion meter, online phosphate determination instrument are carried out
Signal and control connect；It is characterized in that the method that above-mentioned sewage treatment plant sewage chemical dephosphorization automaton controls include with
Lower step:
1) provide data according to pharmaceutical supply business, determine drug concentration Cy, Dephosphorization reagent molecular weight Me, Dephosphorization reagent density p；Root
According to Effluent criteria requirement, determine secondary clarifier effluent phosphorus concentration setting value Ceff；Determine that trivalent metal salt and chemical agent go dephosphorization
Mol ratio coefficient f be 1.2；Biological reaction pool is carried out once sampling in manual 24 hours, detects phosphorus concentration Cin_0,
24 arrays arrived are as follows for presetting water inlet phosphorus concentration control array: Cin_0 (i), and wherein i is 1-24；Input in the controller
Above-mentioned data；
2) the d days manual inspection biological reaction pool inlet COD concentration CODin_d；The the one d days manual at t detection biological respinse
Pond water inlet phosphorus concentration Cin_d (t), wherein, d is that system is run the d days, calculates and the deviation of the array that prestores: Δ _ d=Cin_d
T ()-Cin_0 (t), unit is mg/L, and preset water inlet phosphorus concentration controlling array changing value is Δ _ d (mg/L), regenerates the same day
Water inlet phosphorus concentration controls array, i.e. Cin_d (i)=Cin_0 (i)+Δ _ d；Above-mentioned data input control system；
3) gather feed water flow gauge signal Q (t) and calculate the flow of inlet water of input controller；
Qk (t)=Q (t-m) formula (1)
Qk (t)-t chemical feeding points flow (m3/s)；
Q (t-m)-(t-m) moment, flow of inlet water (m3/s)
M-flow lag coefficient, (h)
4) the biological reaction pool water inlet phosphorus concentration corresponding to current time chemical feeding points is calculated
Cdos (t)=Cin_d (t-n) formula (2)
In formula, Cdos (t)-chemical feeding points phosphorus concentration controls array (mg/L)；
Cin_d (t-n)-biological reaction pool water inlet phosphorus concentration controls array (mg/L)
N-concentration lag coefficient, (h)
5) chemical feeding quantity needed is calculated according to formula (3)
In formula:
Qc-dosing flow, L/s
Qt-flow of inlet water, m3/s
Cdos (t)-chemical feeding points phosphorus concentration, mg/L
F-trivalent metal salt and chemical agent go the mol ratio coefficient of dephosphorization to be 1.2
Cy-drug concentration, %
Ceff-secondary clarifier effluent phosphorus concentration setting value, mg/L
Me-Dephosphorization reagent molecular weight, g/mol
ρ-Dephosphorization reagent density, kg/L
6) operating frequency of dosing pump is calculated according to formula (4)；
Fhz=qc/ (F1*F2*F3) formula (4)
In formula: fhz=electric machine frequency, hz
Qc=dosing flow, L/s
F1=dosing pump flow and revolution speed ratio
F2=revolution speed and motor speed ratio
F3=motor speed and frequency ratio
7) frequency values of converter is set according to calculated operating frequency；
8) the flow value qon of taken at regular intervals dosing effusion meter, compares with formula (3) value of calculation, when deviation is more than m%,
Adjust the coefficient F1 in formula (4), until deviation is less than n%；
9) gather phosphorus concentration in-line meter data, calculate daily mean Ceff-av every day, when this value sets higher than water outlet phosphorus concentration
The p% of value Ceff, in formula 3, trivalent metal salt and chemical agent go the mol ratio coefficient f of dephosphorization to increase r%；When this value is less than
The p% of water outlet phosphorus concentration value, in formula 3, trivalent metal salt and chemical agent go the mol ratio coefficient f of dephosphorization automatically to reduce r%；
10) gathering phosphorus concentration in-line meter data, periodic analysis two settles out the situation of change of water phosphorus concentration: settle out when certain moment two
Water phosphorus concentration is the most higher, i.e. 7 days have more than s days higher than water outlet phosphorus concentration setting value w% time, heighten biological reaction pool water inlet
Phosphorus concentration controls in array the 1% of corresponding moment phosphorus concentration setting value；When certain moment two water phosphorus concentration that settles out is the most on the low side, i.e. 7
It has more than s days less than water outlet phosphorus concentration setting value u%, reduce biological reaction pool water inlet phosphorus concentration control in array to correspondence time
Carve the v% of phosphorus concentration value；
11) regenerate into water phosphorus concentration control array；
12) 2 are repeated)～11) step.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104958984A (en) * | 2015-06-30 | 2015-10-07 | 成都市新都区鑫悦空气净化设备厂 | Catalytic pool for paint mist treatment |
| CN108002657A (en) * | 2017-12-24 | 2018-05-08 | 苏州克莱尔环保科技有限公司 | A kind of sewage treatment process |
| CN112919727A (en) * | 2020-09-16 | 2021-06-08 | 金风环保有限公司 | Chemical phosphorus removal and medicine adding control method and equipment |
| CN113087231B (en) * | 2021-05-12 | 2022-11-15 | 重庆市生态环境监测中心 | Automatic dosing system for sewage treatment and application thereof |
| CN113636723A (en) * | 2021-08-20 | 2021-11-12 | 广州市华绿环保科技有限公司 | Dephosphorization of handling domestic sewage adds medicine automated control system |
| CN115196735B (en) * | 2022-09-14 | 2023-02-03 | 国投信开水环境投资有限公司 | Phosphorus removal agent adding method and device for efficient sedimentation tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654352A (en) * | 2005-01-06 | 2005-08-17 | 重庆大学 | System and method for urban sewage chemical-biologic composite deep phosphorous removal |
| CN1990393A (en) * | 2005-12-26 | 2007-07-04 | 北京城市排水集团有限责任公司 | Five-factor wastewater treating apparatus |
| CN204097287U (en) * | 2014-09-11 | 2015-01-14 | 北京城市排水集团有限责任公司 | Sewage work's chemical dephosphorization automatic control device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654352A (en) * | 2005-01-06 | 2005-08-17 | 重庆大学 | System and method for urban sewage chemical-biologic composite deep phosphorous removal |
| CN1990393A (en) * | 2005-12-26 | 2007-07-04 | 北京城市排水集团有限责任公司 | Five-factor wastewater treating apparatus |
| CN204097287U (en) * | 2014-09-11 | 2015-01-14 | 北京城市排水集团有限责任公司 | Sewage work's chemical dephosphorization automatic control device |
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