CN116040769A - Coagulant addition amount adjusting method based on settling speed identification - Google Patents

Coagulant addition amount adjusting method based on settling speed identification Download PDF

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CN116040769A
CN116040769A CN202310054902.2A CN202310054902A CN116040769A CN 116040769 A CN116040769 A CN 116040769A CN 202310054902 A CN202310054902 A CN 202310054902A CN 116040769 A CN116040769 A CN 116040769A
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sedimentation tank
coagulant
addition amount
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梁思宸
安娜
肖维贵
颜欣
易娟
方意龙
潘博伦
邹苏红
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Shenzhen Water Group Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
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Abstract

The invention discloses a coagulant addition adjustment method based on sedimentation rate identification, which is characterized in that the method identifies the flocculation sedimentation velocity characteristic through an image processing technology, the flocculation sedimentation velocity characteristic is used as a core parameter to calculate and obtain a theoretical removal rate, an on-line monitoring instrument is used for on-line monitoring of the turbidity of inlet water and outlet water of a sedimentation tank to calculate and obtain an actual removal rate, a user sets the turbidity of ideal outlet water of the sedimentation tank to calculate and obtain an ideal removal rate, and the coagulant addition adjustment percentage is calculated and obtained by comparing the theoretical removal rate, the actual removal rate and the ideal removal rate. The method fully considers the mechanism of removing impurities in water by coagulating sedimentation, improves the timeliness and reliability of prediction by introducing the core parameter of the characteristic of the flocculating constituent sedimentation speed, and has important significance for accurately regulating and controlling the coagulant addition amount.

Description

Coagulant addition amount adjusting method based on settling speed identification
Technical Field
The invention relates to a control method for the addition amount of a water treatment coagulant, in particular to a coagulant addition amount adjusting method based on settling speed identification.
Background
The coagulation and chemical dosing are an important link of water treatment, the coagulant dosage has important influence on the process effect, but the influence has the characteristics of long hysteresis, nonlinearity and the like, so how to realize the automatic control of the coagulation and chemical dosing is always a problem of concern in the water production industry. In the prior art, the administration control method is based on alum blossom characteristic identification and combined with precipitation effluent turbidity control method represented by FCD (also known as FDA), and the other type is based on operation parameters such as flowing current, flow rate, precipitation tank effluent turbidity and the like, and the mathematical model control method represented by SCD is not built based on control logic based on a mechanism model, so that limitations and unreliability with different degrees exist in practice, and satisfactory control effect is not achieved. Therefore, the method for controlling and adjusting the coagulant dosage in the water treatment link is necessary to be researched and improved.
Disclosure of Invention
One of the purposes of the invention is to provide a coagulant addition amount adjusting method based on the settling speed identification aiming at the defects, so as to solve the technical problems of limitation and unreliability of different degrees, influence on the effect of a water treatment process and the like of the similar coagulant addition amount control method in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a coagulant addition amount adjusting method based on settling speed identification, which comprises the following steps:
step A, monitoring the actual effluent turbidity N of a sedimentation tank on line in a water treatment system Out of Turbidity N with the inflow water of the sedimentation tank Feeding in Then, the actual removal rate P is calculated by the formula 1 Actual practice is that of 。
Figure BDA0004060162770000011
Ideal effluent turbidity N of free setting sedimentation tank Out of Then calculating the ideal removal rate P by the formula 2 Ideal for 。
Figure BDA0004060162770000021
Step B, comparing P Actual practice is that of And P Ideal for 。
Such as P Actual practice is that of ＜P Ideal for And increasing the adding amount of the current coagulant according to the coagulant adding amount adjustment rate a%, wherein the adding amount is smaller than the preset adding amount range of the coagulant in the current sedimentation tank.
Such as P Actual practice is that of ＝P Ideal for The addition amount of the existing coagulant is maintained.
Such as P Actual practice is that of ＞P Ideal for And reducing the adding amount of the current coagulant according to the coagulant adding amount adjustment rate a percent, wherein the adding amount is larger than the preset adding amount range of the coagulant in the current sedimentation tank.
Step C, after the coagulant addition amount adjustment rate a% is t time (t is the coagulation section residence time of the water plant) through an image processing technology, identifying the floc sedimentation speed in a sedimentation tank, and obtaining the floc sedimentation speed u i And floc duty ratio p i The method comprises the steps of carrying out a first treatment on the surface of the Then calculating to obtain the theoretical sedimentation tank treatment efficiency P through 3 Theory of 。
The vertical flow sedimentation tank treatment efficiency is as follows:
P theory of ＝(1-P 0 ) (3.1)
Other sedimentation tank treatment efficiency is:
Figure BDA0004060162770000022
in formula 3, P 0 To a sedimentation velocity less than the interception sedimentation velocity u 0 Due to the floc settling velocity u i And floc duty ratio p i The particle sedimentation velocity is obtained through image recognition, and the particle sedimentation velocity is not uniform, so that the particle sedimentation velocity is not a fixed velocity but a velocity distribution through image recognition, and the particle proportion with the sedimentation velocity smaller than the interception sedimentation velocity can be obtained.
The interception of the sinking speed u 0 Calculated by equation 4.
Figure BDA0004060162770000023
In the formula 4, Q is the treated water amount of the sedimentation tank, and A is the equivalent surface area of the sedimentation tank.
Treatment efficiency P from theoretical sedimentation tank through 5 Theory of Re-calculating the actual sedimentation tank treatment efficiency P Actual practice is that of 。
P Actual practice is that of ＝kP Theory of (5)
In formula 5, k is the theoretical sedimentation tank treatment efficiency P Theory of And the actual sedimentation tank treatment efficiency P Actual practice is that of Is calculated from equation 6.
Figure BDA0004060162770000031
The coagulant addition amount adjustment rate a% was determined by the method of 7.
Figure BDA0004060162770000032
And adjusting the adding amount of the coagulant in the current sedimentation tank by the adding amount adjustment rate a percent.
Preferably, the further technical scheme is as follows: the method further comprises the step of repeating the step B and the step C after the addition amount adjustment rate a% is calculated.
The further technical scheme is as follows: when the sedimentation tank is a advection sedimentation tank, the equivalent surface area A of the sedimentation tank is the projection area of the sedimentation tank on the horizontal plane; when the sedimentation tank is a pipe chute or an inclined plate sedimentation tank, the equivalent surface area A of the sedimentation tank is the sum of the projection area of the sedimentation tank on the horizontal plane and the projection area of the pipe chute or the inclined plate in the sedimentation tank.
The further technical scheme is as follows: before the method is executed, firstly, setting the adding amount range of coagulant [ A ] min ，A max ]The method comprises the steps of carrying out a first treatment on the surface of the If the adjusted addition amount is greater than A after the addition amount adjustment rate a% is calculated max Taking the adjusted addition amount as A max The method comprises the steps of carrying out a first treatment on the surface of the If the calculated addition amount adjustment rate a% shows that the adjusted addition amount is smaller than A min Taking the adjusted addition amount as A min 。
The further technical scheme is as follows: the parameters required to be input when the method is executed at least comprise the type of the sedimentation tank, the parameters of the sedimentation tank and the ideal turbidity N of the effluent Out of The method comprises the steps of carrying out a first treatment on the surface of the The sedimentation tank type comprises a horizontal sedimentation tank, a vertical sedimentation tank, an inclined pipe sedimentation tank and an inclined plate sedimentation tank; the sedimentation tank parameters comprise the residence time t of the coagulation section and the equivalent surface area A.
The further technical scheme is as follows: the image processing technology is hyperspectral image target detection and particle swarm algorithm.
Compared with the prior art, the invention has one of the following beneficial effects: identifying the floc sedimentation speed characteristic by an image processing technology, calculating to obtain a theoretical removal rate by taking the floc sedimentation speed characteristic as a core parameter, simultaneously, utilizing an online monitoring instrument to online monitor the turbidity of inlet water and outlet water of a sedimentation tank and calculate to obtain an actual removal rate, setting the ideal turbidity of outlet water of the sedimentation tank by a user to calculate to obtain an ideal removal rate, and comparing the theoretical removal rate, the actual removal rate and the ideal removal rate to calculate to obtain the coagulant addition amount adjustment percentage. The method fully considers the mechanism of removing impurities in water by coagulating sedimentation, improves the timeliness and reliability of prediction by introducing the core parameter of the characteristic of the flocculating constituent sedimentation speed, and has important significance for accurately regulating and controlling the coagulant addition amount.
Drawings
Fig. 1 is a flow chart illustrating a method according to one embodiment of the present invention.
FIG. 2 is a flowchart for calculating the coagulant addition amount adjustment rate a% in FIG. 1.
Detailed Description
The invention is further elucidated below in connection with the accompanying drawings.
Referring to fig. 1, in the embodiment of the present invention, the coagulant addition amount adjustment method based on the settling rate identification is performed as follows:
step S1, manually inputting parameters including the type of a sedimentation tank (vertical flow type, horizontal flow type, inclined plate and inclined pipe), the parameters of the sedimentation tank (equivalent sedimentation area A and coagulation section residence time t) and the ideal effluent turbidity N Ideal for Coagulant addition amount range [ A ] min ，A max ]Etc. parameters necessary for calculation.
S2, acquiring parameters, namely acquiring parameters from a sedimentation tank through image processing technologies such as hyperspectral image target detection and particle swarm optimization, and acquiring sedimentation velocity distribution through the image processing technologies to obtain different sedimentation velocities u i Duty ratio p of flocs i . Acquiring turbidity N of inflow water of sedimentation tank by utilizing on-line monitoring equipment in water treatment system Feeding in Turbidity N of effluent Out of Flow Q.
And S3, calculating the coagulant addition amount adjustment rate a% according to the parameters obtained in the step S1 and the step S2.
And then repeating the steps S2 and S3, and updating and iterating the coagulant addition amount adjustment rate a% through multiple times of calculation.
Referring to fig. 2, in this example, the coagulant addition amount adjustment rate a% is calculated as follows:
through the image placeAfter the residence time t of the coagulation section, the treatment technology identifies the floc sedimentation velocity in the sedimentation tank and obtains the floc sedimentation velocity u i And floc duty ratio p i The method comprises the steps of carrying out a first treatment on the surface of the Then calculating to obtain the theoretical sedimentation tank treatment efficiency P through 3 Theory of 。
The vertical flow sedimentation tank treatment efficiency is as follows:
P theory of ＝(1-P 0 ) (3.1)
Other sedimentation tank treatment efficiency is:
Figure BDA0004060162770000051
in formula 3, P 0 To a sedimentation velocity less than the interception sedimentation velocity u 0 The particle ratio of the above-mentioned interception sinking speed u 0 Calculated by equation 4.
Figure BDA0004060162770000052
In formula 4, Q is the amount of treated water in the sedimentation tank, and a is the equivalent surface area of the sedimentation tank. When the sedimentation tank is a advection sedimentation tank, the equivalent surface area A of the sedimentation tank is the projection area of the sedimentation tank on the horizontal plane; when the sedimentation tank is a pipe chute or an inclined plate sedimentation tank, the equivalent surface area A of the sedimentation tank is the sum of the projection area of the sedimentation tank on the horizontal plane and the projection area of the pipe chute or the inclined plate in the sedimentation tank.
Treatment efficiency P from theoretical sedimentation tank through 5 Theory of Re-calculating the actual sedimentation tank treatment efficiency P Actual practice is that of 。
P Actual practice is that of ＝kP Theory of (5)
In formula 5, k is the theoretical sedimentation tank treatment efficiency P Theory of And the actual sedimentation tank treatment efficiency P Actual practice is that of Is calculated from equation 6.
Figure BDA0004060162770000061
The coagulant addition amount adjustment rate a% was determined by the method of 7.
Figure BDA0004060162770000062
The adding amount of coagulant in the current sedimentation tank is adjusted by the adding amount adjustment rate a%, and in the adjustment process, the actual turbidity N of the effluent in the sedimentation tank is monitored on line by a water treatment system Out of Turbidity N with the inflow water of the sedimentation tank Feeding in Then, the actual removal rate P is calculated by the formula 1 Actual practice is that of 。
Figure BDA0004060162770000063
Ideal effluent turbidity N of free setting sedimentation tank Out of Then calculating the ideal removal rate P by the formula 2 Ideal for 。
Figure BDA0004060162770000064
Comparison P Actual practice is that of And P Ideal for 。
Such as P Actual practice is that of ＜P Ideal for And increasing the adding amount of the current coagulant according to the coagulant adding amount adjustment rate a%, wherein the adding amount is smaller than the preset adding amount range of the coagulant in the current sedimentation tank.
Such as P Actual practice is that of ＝P Ideal for The addition amount of the existing coagulant is maintained.
Such as P Actual practice is that of ＞P Ideal for And reducing the adding amount of the current coagulant according to the coagulant adding amount adjustment rate a percent, wherein the adding amount is larger than the preset adding amount range of the coagulant in the current sedimentation tank.
As mentioned above, the coagulant addition amount range [ A ] is manually set min ，A max ]If the adjusted addition amount is greater than A after the addition amount adjustment rate a% is calculated max Taking the adjusted addition amount asA max The method comprises the steps of carrying out a first treatment on the surface of the If the calculated addition amount adjustment rate a% shows that the adjusted addition amount is smaller than A min Taking the adjusted addition amount as A min 。
In the embodiment of the invention, the coagulant addition adjustment percentage is calculated by taking the floc precipitation speed in the precipitation tank as a core parameter, calculating the theoretical precipitation tank treatment efficiency based on the floc precipitation speed and comparing the theoretical precipitation tank treatment efficiency with the actual precipitation tank treatment efficiency, so that the reliability of coagulant addition adjustment in the water treatment process is effectively improved, and the influence of the coagulant addition problem on the effect of the whole water treatment process is reduced.
In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the invention.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will be apparent to those skilled in the art.

Claims (6)

1. A coagulant addition amount adjusting method based on settling speed identification comprises the following steps:
on-line monitoringActual effluent turbidity N of sedimentation tank Out of Turbidity N with the inflow water of the sedimentation tank Feeding in Then, the actual removal rate P is calculated by the formula 1 Actual practice is that of ；
Figure FDA0004060162760000011
Ideal effluent turbidity N of free setting sedimentation tank Out of Then calculating the ideal removal rate P by the formula 2 Ideal for ；
Figure FDA0004060162760000012
Comparison P Actual practice is that of And P Ideal for ；
Such as P Actual practice is that of ＜P Ideal for Increasing the adding amount of the current coagulant according to the coagulant adding amount adjustment rate a%, wherein the adding amount is smaller than the preset adding amount range of the coagulant in the current sedimentation tank;
such as P Actual practice is that of ＝P Ideal for The adding amount of the existing coagulant is maintained;
such as P Actual practice is that of ＞P Ideal for Reducing the adding amount of the current coagulant according to the coagulant adding amount adjustment rate a%, wherein the adding amount is larger than the preset adding amount range of the coagulant in the current sedimentation tank;
the coagulant addition amount adjustment rate a% is that after the coagulation section stays for a time t by an image processing technology, the floc sedimentation speed in a sedimentation tank is identified, and the floc sedimentation speed u is obtained i And floc duty ratio p i The method comprises the steps of carrying out a first treatment on the surface of the Then calculating to obtain the theoretical sedimentation tank treatment efficiency P through 3 Theory of ；
Figure FDA0004060162760000013
In formula 3, P 0 To a sedimentation velocity less than the interception sedimentation velocity u 0 The particle ratio of the interception sinking speed u 0 Calculated by formula 4;
Figure FDA0004060162760000014
in the formula 4, Q is the treated water amount of the sedimentation tank, and A is the equivalent surface area of the sedimentation tank;
treatment efficiency P from theoretical sedimentation tank through 5 Theory of Re-calculating the actual sedimentation tank treatment efficiency P Actual practice is that of ；
P Actual practice is that of ＝kP Theory of (5)
In formula 5, k is the theoretical sedimentation tank treatment efficiency P Theory of And the actual sedimentation tank treatment efficiency P Actual practice is that of Is calculated by the formula 6;
Figure FDA0004060162760000021
determining the coagulant addition amount adjustment rate a% through a 7;
Figure FDA0004060162760000022
and adjusting the adding amount of the coagulant in the current sedimentation tank by the adding amount adjustment rate a percent.
2. The coagulant addition amount adjustment method based on the settling velocity identification according to claim 1, characterized by comprising the following steps: the method also comprises the step of comparing the P again after the addition amount adjustment rate a% is calculated Actual practice is that of And P Ideal for And recalculate the addition amount adjustment rate a% based on the comparison result.
3. The coagulant addition amount adjustment method based on the settling velocity identification according to claim 1, characterized by comprising the following steps: when the sedimentation tank is a advection sedimentation tank, the equivalent surface area A of the sedimentation tank is the projection area of the sedimentation tank on the horizontal plane;
when the sedimentation tank is a pipe chute or an inclined plate sedimentation tank, the equivalent surface area A of the sedimentation tank is the sum of the projection area of the sedimentation tank on the horizontal plane and the projection area of the pipe chute or the inclined plate in the sedimentation tank.
4. The coagulant addition amount adjustment method based on the settling velocity identification according to claim 1, characterized by comprising the following steps:
before the method is executed, firstly, setting the adding amount range of coagulant [ A ] min ，A max ]；
If the adjusted addition amount is greater than A after the addition amount adjustment rate a% is calculated max Taking the adjusted addition amount as A max ；
If the calculated addition amount adjustment rate a% shows that the adjusted addition amount is smaller than A min Taking the adjusted addition amount as A min 。
5. The coagulant addition amount adjustment method based on the settling rate identification according to claim 1 or 4, characterized in that: the parameters required to be input when the method is executed at least comprise the type of the sedimentation tank, the parameters of the sedimentation tank and the ideal turbidity N of the effluent Out of The method comprises the steps of carrying out a first treatment on the surface of the The sedimentation tank type comprises a horizontal sedimentation tank, a vertical sedimentation tank, an inclined pipe sedimentation tank and an inclined plate sedimentation tank; the sedimentation tank parameters comprise the residence time t of the coagulation section and the equivalent surface area A.
6. The coagulant addition amount adjustment method based on the settling velocity identification according to claim 1, characterized by comprising the following steps: the image processing technology is hyperspectral image target detection and particle swarm algorithm.
CN202310054902.2A 2023-02-03 2023-02-03 Coagulant addition amount adjusting method based on settling speed identification Pending CN116040769A (en)

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