CN100427175C - Device and method for controlling infusion of flocculating agent - Google Patents
Device and method for controlling infusion of flocculating agent Download PDFInfo
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- CN100427175C CN100427175C CNB2006101080757A CN200610108075A CN100427175C CN 100427175 C CN100427175 C CN 100427175C CN B2006101080757 A CNB2006101080757 A CN B2006101080757A CN 200610108075 A CN200610108075 A CN 200610108075A CN 100427175 C CN100427175 C CN 100427175C
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Abstract
To provide coagulant injection control which solving the problem that the calculation of a coagulant injection rate without considering all affecting factors. The coagulant injection control device has a coagulant injection rate calculation means for calculating a coagulant injection rate by using a turbidity removal coefficient for the water cleaning process, expressing the relation between the turbidity of the raw water at a point of time a certain time before a specified time in the coagulation/sedimentation basin and the coagulant injection rate at the point prior to the given point by the fixed time as an exponential expression or a logarithmic expression, a coagulant injection amount calculation means for calculating a coagulant injection amount by multiplying the coagulant injection rate calculated by the coagulant injection rate calculation means and the flow rate of the raw water at the given point, and a control means for controlling a coagulant injection system based on the coagulant injection amount.
Description
Technical field
The present invention relates to a kind of running management of purifier,, suitably inject flocculating agent, obtain the water purification of stabilizing water quality corresponding to the turbid matter of the former water of water intaking.
Background technology
In patent documentation 1, in order under the situation of the frequent change of raw water turbidity, the flocculating agent injection rate to be controlled at optimum value ([0010]), deviation according to streaming potential D is obtained weight coefficient, and the output valve of the flocculating agent injection rate of feedforward controller and feedback controller is revised ([0049]).In addition, the relation of flocculating agent injection rate and streaming potential is classified by turbidity, retention performance curve ([0046]), flocculating agent injection rate coefficient of utilization or constant are defined as exponential function.
Patent documentation 1: the spy opens the 2003-284904 communique
In above-mentioned patent documentation 1, after determining the flocculating agent injection rate, revise with weight coefficient with exponential form.When calculating this flocculating agent injection rate automatically, do not consider whole influence factors that coagulative precipitation is handled.
Summary of the invention
The present invention makes in view of above-mentioned prior art problems, its purpose is to provide a kind of flocculating agent to inject control, can utilize and remove coefficient as the turbidity of the coefficient that has comprised whole influence factors that coagulative precipitation handles and determine the flocculating agent injection rate, thereby coagulative precipitation processing water stable, high-quality can be provided.
The present inventor uses the turbid matter of the rivers and creeks surface water, has attentively implemented from the coagulative precipitation experiment of low turbidity to one ten thousand degree superelevation turbidity.The details aftermentioned, but be that in the good scope of the turbidity of coagulative precipitation processing water, it is relevant with the flocculating agent injection rate of this moment with the turbidity of former water to make coagulative precipitation handle water turbidity according to the knowledge that this experimental result obtains, and the exponential form of available isomorphism is expressed, thereby obtains the present invention.
According to this knowledge, the present invention constitutes the utilization index formula or numerical expression is represented that the turbidity of water is handled in coagulative precipitation, this coagulative precipitation is handled water and is injected into the raw water turbidity of flocculating agent process and the relation between the flocculating agent injection rate in this process, its index coefficient value is removed coefficient as turbidity, remove coefficient according to this turbidity, calculate essential flocculating agent injection rate, thus control flocculating agent injection rate.
The invention provides a kind of flocculating agent injection control device, thereby be used for making of the clean water treatment of the turbid matter of former water, and carry out the injection control of described flocculating agent, it is characterized in that having in the coagulative precipitation of coagulative precipitation pond in order to inject flocculating agent:
Flocculating agent injection rate calculating unit, use the turbidity of clean water treatment to remove coefficient, calculate the flocculating agent injection rate, described turbidity is removed coefficient and is represented from as the turbidity ta of the processing water in certain described coagulative precipitation pond constantly, from the turbidity Ta of the described former water in described certain moment after beginning constantly to recall the stipulated time and from the exponential ta=Tae of the relation between the flocculating agent injection rate Ca of the described flocculating agent in described certain moment after beginning constantly to recall the stipulated time with exponential form or to numerical expression
-k1CaOr to numerical expression k1=-(ln (ta/Ta))/Ca, obtain turbidity and remove coefficient, when establishing current raw water turbidity is that turbidity desired value that water is handled in the coagulative precipitation of Ti, setting is that to remove coefficient be k1, when the flocculating agent injection rate is Cm, utilizes numerical expression Cm=-(ln (tm/Ti))/k1 is calculated flocculating agent injection rate Cm for tm, turbidity;
Flocculating agent injection rate calculating unit multiplies each other the flocculating agent injection rate that described flocculating agent injection rate calculating unit calculates and the flow of described certain former water constantly, calculates the flocculating agent injection rate; With
Control assembly, according to described flocculating agent injection rate, control flocculating agent injection device.
The present invention also provides a kind of flocculating agent injection control method of clean water treatment, thereby the turbid matter that described clean water treatment injection flocculating agent makes former water is characterized in that in the coagulative precipitation of coagulative precipitation pond:
From as the turbidity ta of the processing water in certain described coagulative precipitation pond constantly, from the turbidity Ta of the described former water in described certain moment after beginning constantly to recall the stipulated time and from the exponential ta=Tae of the relation between the flocculating agent injection rate Ca of the described flocculating agent in described certain moment after beginning constantly to recall the stipulated time
-k1CaOr to numerical expression k1=-(ln (ta/Ta))/Ca, obtain turbidity and remove coefficient, when establishing current raw water turbidity is that turbidity desired value that water is handled in the coagulative precipitation of Ti, setting is that to remove coefficient be k1, when the flocculating agent injection rate is Cm, utilizes numerical expression Cm=-(ln (tm/Ti))/k1 is calculated flocculating agent injection rate Cm for tm, turbidity;
The flow of the described flocculating agent injection rate that calculates and described certain former water is constantly multiplied each other, calculate the flocculating agent injection rate; And
According to described flocculating agent injection rate, control flocculating agent injection device.
Have following effect: turbidity is removed coefficient and is comprised whole influence factors that coagulative precipitation is handled, and can easy, suitably determine the flocculating agent injection rate, thereby can provide coagulative precipitation stable, high-quality to handle water.
Description of drawings
Fig. 1 is the structure chart of the explanation embodiment of the invention 1.
Fig. 2 is the figure of the relation of explanation turbidity of the embodiment of the invention 1 and flocculating agent injection rate.
Fig. 3 is the turbidity of supplementary notes in the expression embodiment of the invention 1 and the figure of the relation of flocculating agent injection rate.
Fig. 4 is the structure chart of the explanation embodiment of the invention 2.
Fig. 5 is the structure chart of the explanation embodiment of the invention 3.
Fig. 6 is the structure chart of the batch (-type) cyclator portion of the explanation embodiment of the invention 3.
Fig. 7 is the structure chart of the explanation embodiment of the invention 4.
Fig. 8 is the structure chart of the explanation embodiment of the invention 5.
Fig. 9 is the tentative calculation example of the flocculating agent injection rate of the explanation embodiment of the invention 6.
Symbol description
1,1B... former water, 2... medicine mixing pit, 3... agglomerate forms the pond, 4... sedimentation basin, 5... water is handled in coagulative precipitation, 6... spoil disposal liquid, 7... flocculating agent storagetank, 8... flocculating agent injection device, 9,9B... flocculating agent, 10... flocculating agent injection control device, 21,24,24B... flowmeter, 22,22B, 22C... nephelometer, 25,26,27... water quality analyser, 32, the 505... turbidity is removed coefficient calculator, 33... flocculating agent injection rate calculator, 34... controller, 36... flocculating agent injection rate calculator, 37... basic the notes put the rate calculator, 50... batch (-type) cyclator
The specific embodiment
Remove coefficient based on the turbidity that the experimental knowledge that utilizes the present inventor obtains, obtain the flocculating agent injection rate, can suitably inject the purpose of running management of the clean water treatment of flocculating agent from low turbidity to the superelevation turbidity thereby realize providing.Below, embodiment is described with reference to the accompanying drawings.
Fig. 1 illustrates embodiments of the invention 1.
Embodiments of the invention shown in Fig. 11.In Fig. 1, clean water treatment is a main composition equipment with medicine mixing pit 2, agglomerate formation pond 3, sedimentation basin 4.The former water 1 that contains turbid matter is injected into flocculating agent 9 from flocculating agent injection device 8 in medicine mixing pit 2.The 7th, the flocculating agent storagetank.In flocculating agent, use the inorganic system or the macromolecular of aluminium system or iron system etc.In medicine mixing pit 2, utilize mixer 201 that flocculating agent is mixed in the former water equably, turbid matter and flocculating agent combine, and form the microagglomerate as the nuclear of agglomerate.Microagglomerate forms in the pond 3 at agglomerate and becomes big by the mixer 301 that turns round with the speed that is lower than mixer 201, becomes thick agglomerate.The agglomerate that becomes thick precipitates in sedimentation basin 4, and supernatant (the coagulative precipitation processing water) 5 of having removed turbid matter is accepted predetermined processing (filtering or sterilization) at back segment and afterwards, supplied water as water purification.Outside the agglomerate that precipitates and isolates in sedimentation basin 4 is exhausted from system as spoil disposal liquid.
In the clean water treatment of such water treatment plant, the flocculating agent injection control device 10 that the control flocculating agent injects has flocculating agent injection rate calculator 33, controller 34, flocculating agent injection rate calculator 36.Flocculating agent injection control device 10 can use turbidity to remove coefficient not having as described later among the embodiment 2 under the situation that turbidity removes coefficient calculator 32.For making illustrative ease, remove the example of coefficient calculator 32 and illustrate to have turbidity.Flocculating agent injection rate calculator 36 is to use turbidity to remove the parts that COEFFICIENT K 1 is calculated the flocculating agent injection rate.Its using method can be enumerated a plurality of embodiment, put down in writing among the embodiment 1 and used turbidity to remove the embodiment that COEFFICIENT K 1 is directly obtained the flocculating agent injection rate, put down in writing among the embodiment 5 and do not used turbidity to remove COEFFICIENT K 1, and be to use other calculating formula to obtain the basic injection rate of flocculating agent, use turbidity to remove COEFFICIENT K 1 then and revise the basic injection rate of this flocculating agent, thereby obtain the embodiment of flocculating agent injection rate.Shown in embodiment 1,2,5, have the various usings method that turbidity is removed coefficient.
Turbidity T in the former water 1 that utilizes nephelometer 22 to measure is imported and stores turbidity into and remove in the coefficient calculator 32.The coagulative precipitation that utilizes nephelometer 22B to measure handled the turbidity t of water 5 and be stored in flocculating agent injection rate C in the flocculating agent injection rate calculator 36 and be input to turbidity and remove in the coefficient calculator 32.Remove in the coefficient calculator 32 at turbidity, handle turbidity ta, this coagulative precipitation pond of water 5 according to current coagulative precipitation and handle raw water turbidity Ta and the flocculating agent injection rate Ca of this moment that water is injected into the moment of flocculating agent 9, utilize the exponential form of formula (1) or formula (1) is out of shape after numerical expression calculated turbidity the removing COEFFICIENT K 1 of formula (2).If the time that begins till the time of measuring current turbidity ta from the moment of injecting flocculating agent is τ.The data of raw water turbidity in the moment of τ are recalled in Ta input from the time of measuring current turbidity ta.The data of flocculating agent injection rate C in the moment of τ are recalled in Ca input from the time of measuring current turbidity ta.
ta＝Ta·e
-K1·Ca (1)
k1＝-(ln(ta/Ta))/Ca (2)
Fig. 2 is the present inventor's a experimental result, is to change initial turbidity and flocculating agent injection rate, and measures the figure behind the turbidity that precipitates supernatant.Usually, the turbidity desired value of coagulative precipitation being handled water 5 in clean water treatment is set in below 10 degree.As can be seen from Figure 2, be 10 degree when following at turbidity, the relation of supernatant turbidity t and flocculating agent injection rate C can in order to initial turbidity T be the straight line of intercept, promptly with the exponential t=Te of formula (1) isomorphism
-KCExpression.Even initial turbidity difference, the also available isomorphism formula of this relation is represented.But, be subjected to the influence of initial turbidity with respect to the gradient of the decline degree of flocculating agent injection rate and change as turbidity.For example this means that the turbidity of handling water 5 in coagulative precipitation is 10 degree, in the time of will being modified to desired value 1 and spending, must makes its variation by coagulative precipitation characteristic separately.Gradient is the index portion COEFFICIENT K of exponential form, is called turbidity and removes coefficient.It is that agglomerate after injecting flocculating agent forms or precipitation process that turbidity is removed COEFFICIENT K, has covered the coefficient of the influence of the factor beyond raw water turbidity and the cohesion dosage.In other words, obtain flocculating agent injection rate or its adjusted rate, then can also consider the flocculating agent injection management of raw water turbidity and flocculating agent factor in addition if remove COEFFICIENT K according to turbidity.
Flocculating agent injection rate calculator 36 will be removed COEFFICIENT K 1 from the turbidity that turbidity is removed coefficient calculator 32, handle in the formula (3) of turbidity desired value tm substitution as the deformation type of formula (2) of water in current raw water turbidity Ti and predefined coagulative precipitation pond, calculate and keep the necessary flocculating agent injection rate of turbidity desired value tm Cm.
Cm＝-(ln(tm/Ti))/k1 (3)
Formula (3) is calculated and to be utilized turbidity to remove COEFFICIENT K 1 to make raw water turbidity Ti become the flocculating agent injection rate Cm of desired value tm, but also can handle water turbidity ta and desired value tm revise with the coagulative precipitation pond.Because adjusted rate Δ Cm makes and handles water turbidity ta and become desired value tm, so be that ta obtains by the Ti that makes formula (3).
ΔCm＝-(ln(tm/ta))/K1 (4)
These operating concepts shown in Fig. 3.Along the following processing water turbidity tb of desired value then makes its direction that reduces operation flocculating agent injection rate if the above processing water turbidity ta of desired value then makes it increase.
Flocculating agent injection rate calculator 33 makes from the flocculating agent injection rate Cm of flocculating agent injection rate calculator 36 with from the raw water flow Q of flowmeter 21 and multiplies each other, and calculates flocculating agent injection rate Qc.Controller 34 is regulated flocculating agent injection device 8 according to the deviation of the flocculating agent injection rate Qc that calculates with the flocculating agent implant operation amount Qc ' that exports from flowmeter 24.Flocculating agent injection device 8 is valve or flow changeable type pump.
Like this, the turbidity of use clean water treatment is removed coefficient and is calculated the flocculating agent injection rate, wherein, this turbidity is removed coefficient utilization index formula or numerical expression is represented the turbidity of certain coagulative precipitation pond processing water constantly, the turbidity of the former water in the moment after beginning constantly to recall the stipulated time from certain, and the relation of the flocculating agent injection rate of the flocculating agent in the moment after beginning constantly to recall the stipulated time from certain, and, calculate the flocculating agent injection rate by using this turbidity to remove coefficient, whole influence factors that can comprise the coagulative precipitation processing are interior, and are easy, suitably determine the flocculating agent injection rate.
Embodiments of the invention shown in Fig. 42.If with formula (2) substitution formula (3), then can remove under the situation of coefficient calculator 32 in that turbidity is not set, according to considering that turbidity removes the formula of COEFFICIENT K 1 (5), directly calculate flocculating agent injection rate Cm.Make flocculating agent injection rate calculator 36 have the flocculating agent injection rate in the past or the memory function of turbidity value, and keep the necessary flocculating agent injection rate of turbidity desired value tm Cm with formula (5) calculating.
Cm＝Ca(ln(tm/Ti))/(ln(ta/Ta)) (5)
Flocculating agent injection rate calculator 33 is later on identical with embodiment 2.When using turbidity to remove coefficient by the calculating that incorporates into the flocculating agent injection rate as the formula (5), identical with embodiment 1, can comprise influence factor that coagulative precipitation handles interior, easy, suitably determine the flocculating agent injection rate.
Embodiments of the invention shown in Fig. 53.The 50th, the batch (-type) cyclator is imported into a part of 1B of former water 1.The topology example of the cyclator of batch (-type) shown in Fig. 6 50.The 503rd, the coagulative precipitation operation is introduced the former water 1B of the water guide of ormal weight v among the container J1 of specified volume by the operation of valve V1, V2.Under the state that makes the agitator running, inject the flocculating agent 9B of ormal weight by the operation of valve V3.After the injection, agitator M1 passes through the revolution of regulation and stops after the time.After stopping, opening valve V4, measure the turbidity t2 of precipitation supernatant with nephelometer 22C through after the stipulated time.Nephelometer 22C also measures the preflood turbidity t1 of the flocculating agent that is imported into former water 1B.In addition, measure flocculating agent injection rate q with flowmeter 24B.After the turbidity t2 that has measured the precipitation supernatant, operation valve V5, the inside liquid of amount discharge container J1 repeats aforesaid operations, regularly implements the coagulative precipitation characteristic.These operations are carried out by sequence circuit 502 by the operational order of timing adjustment circuit 501.
The measured value of nephelometer 22C and flowmeter 24B is stored in the database 504.The data of being stored are input to turbidity by timing adjustment circuit 501 and remove in the coefficient calculator 505, utilize formula (6) to calculate turbidity and remove COEFFICIENT K 2.Flocculating agent injection rate C obtains with q/v.
K2＝-(ln(t2/t1))/C (6)
To remove COEFFICIENT K 2 and be input in the flocculating agent injection rate calculator 36 from the turbidity that turbidity is removed coefficient calculator 505 from the current raw water turbidity Ti of nephelometer 22, according to the turbidity desired value tm of predefined coagulative precipitation pond processing water, keep the necessary flocculating agent injection rate of turbidity desired value tm Cm with formula (7) calculating.
Cm＝-(ln(tm/Ti))/k2?(7)
Identical after the flocculating agent injection rate calculator 33 with embodiment 1.
The turbidity of batch (-type) cyclator 50 is removed the structure that coefficient calculator 505 can form flocculating agent injection control device 10.Other timing adjustment circuit 501, sequence circuit 502, database 504 also can form the structure of flocculating agent injection control device 10.
As present embodiment, the turbidity that is provided for calculating the batch (-type) coagulative precipitation is removed the batch (-type) turbidity of coefficient and is removed the coefficient calculations parts, wherein, this turbidity remove coefficient with exponential form or to numerical expression represent to import the part of former water in the container of specified volume and inject, stir, leave standstill the batch (-type) cyclator of flocculating agent the preflood turbidity of flocculating agent, leave standstill the turbidity of the precipitation supernatant after the stipulated time and obtain relation between the flocculating agent injection rate of process of this supernatant turbidity.
Flocculating agent injection rate calculating unit is according to the calculating formula that desired value constitutes that preestablishes of the turbidity of being removed coefficient, certain former water constantly by the turbidity of batch (-type) coagulative precipitation and processing water turbidity, calculate the flocculating agent injection rate, thereby can implement to inject, and can prevent time delay corresponding to the water quality of current former water or the flocculating agent of turbid matter state.
Embodiments of the invention shown in Fig. 74.Fig. 7 utilizes coagulative precipitation to handle an example of the turbidity ta correction flocculating agent injection rate of water 5 in the structure of embodiment 3.Flocculating agent injection rate calculator 36 is also carried out the calculating of formula (2) and formula (4) except formula (7), obtain adjusted rate Δ Cm.With the injection rate Cm after the Δ Cm addition of the Cm of formula (7) and formula (4)
*Output in the flocculating agent injection rate calculator 33.Identical after the flocculating agent injection rate calculator 33 with embodiment 1.
Revise by this, can consider the influence of the factor that the state that mixes of clean water treatment is different with the batch (-type) cyclator with reaction and holdup time etc. simultaneously, thereby implement suitable flocculating agent injection management.
Embodiments of the invention shown in Fig. 85.Flocculating agent injection control device 10 also has basic injection rate calculator 37, injection rate corrected Calculation device 38 except flocculating agent injection rate calculator 33, controller 34, flocculating agent injection rate calculator 36.Basic injection rate calculator 37 is transfused to and the corresponding flocculating agent injection rate of the water quality of former water 1 calculating formula.Representative water quality as the influence factor of coagulative precipitation comprises turbidity Ti, basicity AL, pH value, water temperature T h etc.With water quality analyser 22,25,26,27 they are measured and be input in the basic injection rate calculator 37.Corresponding injection model formula these water quality, for example formula (8) is imported in the basic injection rate calculator 37 in advance, calculated basic flocculating agent injection rate Cm.A, b, c, d are constants.
Cm＝a·Ti+b·AL+c·pH+d·Th (8)
Injection rate corrected Calculation device 38 be transfused to raw water turbidity Ti and coagulative precipitation pond handle water turbidity ta and from flocculating agent injection rate calculator 36, at the appointed time before the flocculating agent injection rate Cm ' of operation, and remove COEFFICIENT K 1 with formula (2) calculating turbidity.And, obtain adjusted rate Δ Cm with formula (4).Flocculating agent injection rate calculator 36 makes basic flocculating agent injection rate Cm and adjusted rate Δ Cm addition, obtains the flocculating agent injection rate Cm that should operate
*, and output in the flocculating agent injection rate calculator 33.Identical after the flocculating agent injection rate calculator 33 with embodiment 1.Also can use the step turbidity of embodiment 4 to remove COEFFICIENT K 2, obtain adjusted rate Δ Cm.
As present embodiment, when utilization is calculated the flocculating agent injection rate and is utilized this injection rate that flocculating agent is carried out FEEDFORWARD CONTROL as the representative water quality of the influence factor of coagulative precipitation, the injection rate that calculates is applied the correction of removing coefficient based on turbidity, thereby can carry out following flocculating agent injection management: utilize the flocculating agent injection rate of calculating to reflect water quality, turbid matter proterties beyond considering or the influence factor that causes by processing as representative water quality analyser.
The tentative calculation example of flocculating agent injection rate is described with Fig. 9 below.The tentative calculation process of flocculating agent injection rate is: set raw water turbidity (Fig. 9 (A)), set and handle water turbidity (Fig. 9 (B)), utilize based on the calculating formula of the flocculating agent injection rate of exponential function described later and carry out tentative calculation (Fig. 9 (C)), calculate removing COEFFICIENT K (Fig. 9 (D)), utilizing the Δ Cm (Fig. 9 (C)) that coefficient is calculated the flocculating agent injection rate Cm of previous embodiment (Fig. 9 (C)), calculated previous embodiment that removes of Fig. 9 (D) of previous embodiment.The transverse axis of Fig. 9 (A)～(D) is represented the time (h).
Fig. 9 (A) is the daily variation of raw water turbidity, and it is changed in the scope of 5 degree～30 degree.
Fig. 9 (B) is the turbidity that water is handled in coagulative precipitation, and imposing a condition is the delay of following the holdup time, with the variation interlock of former water, changes in the scope of 0.5 degree～1.5 degree (average 1 degree).Known injection rate calculating formula as the contrast object of tentative calculation is the following formula that depends on raw water turbidity Ti.
C=aTi
n+ b (a, b: constant, n: exponential constant)
Shown in Fig. 9 (C) at constant a=2, b=3, the result that tentative calculation injection rate C obtains under the condition of n=0.5.Owing to all be constant except raw water turbidity Ti, so injection rate C and turbidity Ti are synchronous.
Using raw water turbidity and the coagulative precipitation of having considered holdup time (3h) to handle water turbidity and injection rate C shown in Fig. 9 (D), ask turbidity to remove the result of COEFFICIENT K.The injection rate C that Fig. 9 (C) is pressed in this tentative calculation supposition injects flocculating agent to the raw water turbidity of Fig. 9 (A), and water turbidity is handled in the coagulative precipitation that forms Fig. 9 (B).Turbidity is removed the COEFFICIENT K change as can be known.
Utilize this turbidity to remove COEFFICIENT K and come tentative calculation injection rate Cm of the present invention.In addition, establishing and handling water turbidity desired value tm is 1, obtains adjusted rate Δ Cm, tentative calculation correction injection rate Cm+ Δ Cm.In Fig. 9 (C), put down in writing the result of this Cm and Cm+ Δ Cm simultaneously.The mean value of 3 kinds of injection rates does not have significant difference, if but use turbidity to remove COEFFICIENT K, then the variation of injection rate is big, and setting has reflected influence processing water turbidity, has been the injection rate of coherent various factors.
The flocculating agent injection mode of various turbid qualitative changeizations corresponding to former water is proposed in addition, at present.For example have according to consider the turbidity of former water, except raw water turbidity and then consider the mode that the basicity of former water and flocculating agent that agglomerate formative factors such as pH value, water temperature form injection formula are operated.This mode can utilize feedforward to deal with the change of raw water quality, but the proterties of turbid matter is handled as generality, thereby is difficult to keep constantly suitable injection rate.Especially the proterties in the time of can not tackling rainfall etc. changes.
In addition, as another conventional example, the mode that high turbidity (tens degree～several Baidu) the preparation different injection formula of the low turbidity when having by fine day etc. (～tens degree) during with rainfall etc. operated.This mode also is in the turbidity scope of specific injection formula the proterties of turbid matter to be handled as generality, thereby is difficult to keep constantly suitable injection rate.Especially destroy suitable coagulative precipitation owing near the turbidity of border, forming discontinuous injection rate.
In addition, as a conventional example again, has the feedback append mode, this mode in order to reflect because the agglomerate that the variation of turbid matter proterties causes forms the difference of state or coagulative precipitation characteristic, obtained considering the flocculating agent injection rate calculated value of injection formula of the agglomerate formative factor of raw water qualities such as turbidity, and measure the agglomerate shape facility amount after turbidity that coagulative precipitation handles water or flocculating agent inject, utilize the deviation of itself and desired value to revise injection rate.Modification method comprises PID control or makes departure multiply by constant coefficients so that it is proportional etc.But the water quality of the rivers and creeks surface water etc. has various materials, influences agglomerate and forms and the coagulative precipitation characteristic.The multiple material that the injection formula is not considered also influences the turbidity of precipitation process water, and PID control or the correction of departure ratio not only do not reflect raw water quality or turbid matter proterties truly, can't keep suitable flocculating agent injection management all the time yet.
In addition, as another conventional example, 2 grades of injection modes are also proposed, this mode is corresponding to the former water of superelevation turbidity (several Baidu～several thousand degree), in advance in the former water pipeline that is sent to water treatment plant, inject flocculating agent, make the turbidity of the injection object water in the factory be reduced to prescribed limit, but reckon without turbid matter proterties, thereby be difficult to keep constantly suitable injection rate.
In addition, as another conventional example, have by utilizing former water of particulate counter measures and coagulative precipitation to handle the turbid plasmid footpath of water and mode that number is operated flocculating agent or the mode of operating flocculating agent by the streaming current after turbidity, conductance and the flocculating agent injection of measuring former water.But particulate counter or streaming current meter measure error under the close situation of turbid plasmid is big, can not be applicable to high turbidity or superelevation turbidity liquid.In addition, these measuring instruments must import measuring object liquid narrow test section, thereby the inaccessible or turbid matter that piping system can take place and has bigger problem in the reduction of certainty of measurement or aspect safeguarding to the adhering to of test section.
Compare with these conventional examples, the foregoing description can provide a kind of like this flocculating agent to inject control: can utilize and remove coefficient as the turbidity of the coefficient that has comprised whole influence factors that coagulative precipitation handles and determine the flocculating agent injection rate, thereby coagulative precipitation processing water stable, high-quality can be provided.
In addition, the flocculating agent injection control device of the foregoing description is made of the computer with CPU, memory, input and output portion etc., and carries out the program that is used to carry out the aforementioned calculation processing by CPU.
In addition, in the above-described embodiments, make various calculators have data storage function, the database that measured value and calculated value are preserved in other storage is set, output to calculator in case of necessity but also can constitute.
In addition, turbidity or flocculating agent injection rate have been described on the meaning of point measurement value and calculated value, but also can have used the moving average of stipulated time.
Utilizability on the industry
The present invention forms pond and sedimentation basin except can be applicable to by flocculating agent mixing pit, agglomerate Outside the general clean water treatment that consists of, also can be applicable to the processing of process industry water, in precipitation The back segment in pond have sand filter or utilize film filter plant clean water treatment and at its back segment Added the clean water treatment of the senior treatment facilities such as ozone treatment.
Claims (8)
1, a kind of flocculating agent injection control device, thus make of the clean water treatment of the turbid matter of former water in order to inject flocculating agent in the coagulative precipitation of coagulative precipitation pond, carry out the injection control of described flocculating agent, it is characterized in that having:
Flocculating agent injection rate calculating unit is from as the turbidity ta of the processing water in certain described coagulative precipitation pond constantly, from the turbidity Ta of the described former water in described certain moment after beginning constantly to recall the stipulated time and from the exponential ta=Tae of the relation between the flocculating agent injection rate Ca of the described flocculating agent in described certain moment after beginning constantly to recall the stipulated time
-k1CaOr to numerical expression k1=-(ln (ta/Ta))/Ca, obtain turbidity and remove coefficient, when establishing current raw water turbidity is that turbidity desired value that water is handled in the coagulative precipitation of Ti, setting is that to remove coefficient be k1, when the flocculating agent injection rate is Cm, utilizes numerical expression Cm=-(ln (tm/Ti))/k1 is calculated flocculating agent injection rate Cm for tm, turbidity;
Flocculating agent injection rate calculating unit multiplies each other the flocculating agent injection rate that described flocculating agent injection rate calculating unit calculates and the flow of described certain former water constantly, calculates the flocculating agent injection rate; With
Control assembly, according to described flocculating agent injection rate, control flocculating agent injection device.
2, flocculating agent injection control device according to claim 1 is characterized in that:
Have the batch (-type) turbidity and remove the coefficient calculations parts, the turbidity that is used to calculate the batch (-type) coagulative precipitation is removed coefficient, this turbidity is removed coefficient and is represented to import the part of described former water in the container of specified volume and carry out the injection of flocculating agent with exponential form or to numerical expression, stir, the batch (-type) cyclator that leaves standstill is at the preflood turbidity of flocculating agent, leave standstill the turbidity of the precipitation supernatant after the stipulated time, and obtain relation between the flocculating agent injection rate in the process of this supernatant turbidity
Described flocculating agent injection rate calculating unit calculates flocculating agent injection rate Cm according to the calculating formula that desired value constitutes that preestablishes of the turbidity of the turbidity of being removed coefficient, described certain former water constantly by the turbidity of described batch (-type) coagulative precipitation and described processing water.
3, flocculating agent injection control device according to claim 2 is characterized in that:
Described flocculating agent injection rate calculating unit is according to the turbidity ta of the processing water of being removed coefficient, described certain described coagulative precipitation pond constantly by the turbidity of described clean water treatment and describedly preestablish the calculating formula that desired value constitutes, calculating is maintained the correction value of the flocculating agent injection rate of described desired value, the turbidity that utilizes the correction value correction of described flocculating agent injection rate to comprise described batch (-type) coagulative precipitation is removed coefficient at the interior flocculating agent injection rate that calculates, and calculates flocculating agent injection rate Cm thus.
4, flocculating agent injection control device according to claim 1 is characterized in that:
Have: the basic injection rate calculating unit of flocculating agent, thereby make of the clean water treatment of the turbid matter of former water in the coagulative precipitation of coagulative precipitation pond in order to inject flocculating agent, inject formula according to the predefined flocculating agent of the turbidity of considering former water, calculate the basic injection rate of flocculating agent
Described flocculating agent injection rate calculating unit is according to the calculating formula that desired value constitutes that preestablishes of the turbidity of the turbidity ta of the processing water of being removed coefficient, described certain described coagulative precipitation pond constantly by described turbidity and described processing water, calculating is maintained the correction value of the flocculating agent injection rate of described desired value, utilize the basic injection rate of the described flocculating agent of described correction value correction, calculate flocculating agent injection rate Cm thus.
5, a kind of flocculating agent injection control method of clean water treatment, thus the turbid matter that described clean water treatment injection flocculating agent makes former water is characterized in that in the coagulative precipitation of coagulative precipitation pond:
From as the turbidity ta of the processing water in certain described coagulative precipitation pond constantly, from the turbidity Ta of the described former water in described certain moment after beginning constantly to recall the stipulated time and from the exponential ta=Tae of the relation between the flocculating agent injection rate Ca of the described flocculating agent in described certain moment after beginning constantly to recall the stipulated time
-klCaOr to numerical expression k1=-(ln (ta/Ta))/Ca, obtain turbidity and remove coefficient, when establishing current raw water turbidity is that turbidity desired value that water is handled in the coagulative precipitation of Ti, setting is that to remove coefficient be k1, when the flocculating agent injection rate is Cm, utilizes numerical expression Cm=-(ln (tm/Ti))/k1 is calculated flocculating agent injection rate Cm for tm, turbidity;
The flow of the described flocculating agent injection rate that calculates and described certain former water is constantly multiplied each other, calculate the flocculating agent injection rate; And
According to described flocculating agent injection rate, control flocculating agent injection device.
6, flocculating agent injection control method according to claim 5 is characterized in that:
Calculate the turbidity of batch (-type) coagulative precipitation and remove coefficient, this turbidity is removed coefficient and is represented to import the part of described former water in the container of specified volume and carry out the turbidity of the injection of flocculating agent, the batch (-type) cyclator that stirs, the leave standstill precipitation supernatant at the preflood turbidity of flocculating agent, after leaving standstill the stipulated time and obtain relation between the flocculating agent injection rate of process of this supernatant turbidity with exponential form or to numerical expression
When calculating described flocculating agent injection rate Cm, according to the calculating formula that desired value constitutes that preestablishes of the turbidity of the turbidity of removing coefficient, described certain former water constantly by the turbidity of described batch (-type) coagulative precipitation and described processing water, calculate flocculating agent injection rate Cm.
7, flocculating agent injection control method according to claim 6 is characterized in that:
When calculating described flocculating agent injection rate Cm, according to the turbidity ta of the processing water of removing coefficient, described certain described coagulative precipitation pond constantly by the turbidity of described clean water treatment and describedly preestablish the calculating formula that desired value constitutes, calculating is maintained the correction value of the flocculating agent injection rate of described desired value, the turbidity that utilizes the correction value correction of described flocculating agent injection rate to comprise described batch (-type) coagulative precipitation is removed coefficient at the interior flocculating agent injection rate that calculates, and calculates flocculating agent injection rate Cm thus.
8, flocculating agent injection control method according to claim 5 is characterized in that:
Thereby make of the clean water treatment of the turbid matter of former water in order to inject flocculating agent, inject formula, calculate the basic injection rate of flocculating agent according to the predefined flocculating agent of the turbidity of considering former water in the coagulative precipitation of coagulative precipitation pond;
When calculating described flocculating agent injection rate Cm, the calculating formula that desired value constitutes that preestablishes according to the turbidity of the turbidity ta of the processing water of removing coefficient, described certain described coagulative precipitation pond constantly by described turbidity and described processing water, calculating is maintained the correction value of the flocculating agent injection rate of described desired value, utilize described correction value to revise the basic injection rate of described flocculating agent, calculate flocculating agent injection rate Cm thus.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005216647A JP4492473B2 (en) | 2005-07-27 | 2005-07-27 | Flocculant injection control device and method |
| JP2005216647 | 2005-07-27 | ||
| JP2005-216647 | 2005-07-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1907533A CN1907533A (en) | 2007-02-07 |
| CN100427175C true CN100427175C (en) | 2008-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101080757A Expired - Fee Related CN100427175C (en) | 2005-07-27 | 2006-07-27 | Device and method for controlling infusion of flocculating agent |
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| JP (1) | JP4492473B2 (en) |
| CN (1) | CN100427175C (en) |
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| JP2007098287A (en) * | 2005-10-05 | 2007-04-19 | Hitachi Ltd | Method for controlling operation of water purifying process |
| JP5145311B2 (en) * | 2009-11-10 | 2013-02-13 | 株式会社日立製作所 | Water purification chemical injection control system |
| JP5571424B2 (en) * | 2010-03-26 | 2014-08-13 | メタウォーター株式会社 | Method and apparatus for controlling the injection rate of flocculant in real time |
| JP5636263B2 (en) * | 2010-11-10 | 2014-12-03 | 株式会社日立製作所 | Flocculant injection control system |
| JP5949673B2 (en) * | 2013-06-10 | 2016-07-13 | Ｊｆｅスチール株式会社 | Cyan-containing waste liquid treatment method and cyan-containing waste liquid treatment apparatus |
| JP6158048B2 (en) * | 2013-11-12 | 2017-07-05 | 株式会社東芝 | Water treatment system, water treatment method, water treatment control device, and water treatment control program |
| JP6599704B2 (en) * | 2015-09-17 | 2019-10-30 | 株式会社東芝 | Flocculant injection rate determination method and flocculant injection rate determination device |
| JP6424916B2 (en) * | 2016-05-09 | 2018-11-21 | Ｊｆｅスチール株式会社 | Flocculant injection amount control method in coagulation sedimentation processing |
| JP7021461B2 (en) * | 2017-05-16 | 2022-02-17 | 王子ホールディングス株式会社 | Water treatment method, water treatment equipment and control method of addition of cake layer forming substance to raw water |
| KR101979767B1 (en) * | 2017-05-31 | 2019-05-17 | 한국건설기술연구원 | High-rate sedimentation-flotation system and operation method using the same |
| CN107697996A (en) * | 2017-10-11 | 2018-02-16 | 浙江大学宁波理工学院 | Control with changed scale control method during sewage agglomeration process |
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Also Published As
| Publication number | Publication date |
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| JP4492473B2 (en) | 2010-06-30 |
| JP2007029851A (en) | 2007-02-08 |
| CN1907533A (en) | 2007-02-07 |
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