CN112062251A - Full-automatic lime milk adding system for water works and operation method - Google Patents
Full-automatic lime milk adding system for water works and operation method Download PDFInfo
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- CN112062251A CN112062251A CN202010721660.4A CN202010721660A CN112062251A CN 112062251 A CN112062251 A CN 112062251A CN 202010721660 A CN202010721660 A CN 202010721660A CN 112062251 A CN112062251 A CN 112062251A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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Abstract
The invention discloses a full-automatic lime milk adding system for a tap water plant and an operation method thereof, wherein the full-automatic lime milk adding system comprises a raw water input end, a treatment system, a control system and a water outlet end, the treatment system comprises a coagulation tank, a filter tank, a lime milk storage tank, a first adding device and a second adding device, one end of the coagulation tank is connected with the raw water input end, the other end of the coagulation tank is connected with the filter tank, the filter tank is connected with the water outlet end, one end of the first adding device is connected with the coagulation tank, the other end of the first adding device is connected with the control system, one end of the second adding device is connected with the filter tank, the other end of the second adding device is connected with the control system, and. The invention provides double guarantee for the pH value of the final effluent to reach the set target value by arranging two lime adding systems, so that the pH value of the effluent is not influenced by the fluctuation of the pH value of raw water, the stability of the pH value of the effluent is improved, the adding amount of lime milk is reduced, the operation period and the service life of related facilities are prolonged, and the invention has obvious economic benefit.
Description
Technical Field
The invention relates to a lime milk adding system, in particular to a full-automatic lime milk adding system for a tap water plant and an operation method.
Background
With the high-quality development of socioeconomic of China, the living standard of people is continuously improved, the requirement on the quality of drinking water is higher and higher, and the pollution of water sources is more and more serious with the development of socioeconomic, so that more and more drinking water sources are adjusted to reservoir water or lake water of natural water bodies, and the pH value of the natural water bodies basically presents an acidic state. Aiming at the problem, the water works basically select and add lime emulsion which is cheap and good in quality and has certain coagulation aiding function to adjust the pH value of water, so that the pH value of the factory water reaches the national standard or the internal control standard.
However, the existing lime milk adding system basically adopts a diaphragm variable frequency pump, the adding amount is added only by manual experience, the lime milk is added at the front section of a water plant due to the manual experience, and finally, the pH value of the factory water of the water plant needs to be controlled, so that the manual experience adding has large hysteresis, the fluctuation of the pH value of the outlet water of the water plant is often large, the pH value of the factory water is high due to large adding amount and is wasted, or the pH value of the factory water is low due to over-quick adding amount reduction, and the national standard or the internal control standard is difficult to achieve.
In addition, because lime milk is slightly soluble in water, the prepared lime milk has relatively high concentration and certain insolubility, so that the lime milk is not uniformly dissolved in water, and a large error exists in calculating the adding amount by directly measuring the concentration of the lime milk, so that the pH value of the factory water of a water plant cannot be ensured to be stable no matter how the adding amount of the lime milk is adjusted in normal work.
Finally, due to the characteristics of the lime milk and certain impurities in the lime milk, the lime milk is easy to block a pipeline in the adding process, so that the accurate metering of the lime milk is influenced.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a full-automatic lime milk adding system and an operation method for a tap water plant.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a full-automatic lime milk adding system for a tap water plant, which comprises a raw water input end, a treatment system, a control system and a water outlet end, wherein the treatment system comprises a coagulation tank, a filter tank, a lime milk storage tank, a first adding device and a second adding device, one end of the coagulation tank is connected with the raw water input end, the other end of the coagulation tank is connected with the filter tank, the filter tank is connected with the water outlet end, one end of the first adding device is connected with the coagulation tank, the other end of the first adding device is connected with the control system, one end of the second adding device is connected with the filter tank, the other end of the second adding device is connected with the control system, and the first adding device and the second adding device are respectively connected with the lime milk storage.
Preferably, the first adding device and the second adding device respectively comprise at least one variable frequency pump, and the variable frequency pumps are used for respectively adding lime milk into the coagulation tank or the filtering tank; the input end of the variable frequency pump is connected with the lime milk storage tank and the control system; the output end of a variable frequency pump in the first feeding device is connected with the coagulation tank; and the output end of the variable frequency pump in the second feeding device is connected with the filtering tank.
Preferably, the treatment system further comprises a sedimentation tank and a clean water tank, wherein the sedimentation tank is arranged between the coagulation tank and the filter tank, and the clean water tank is arranged between the filter tank and the water outlet end.
Preferably, the system further comprises a monitoring system, wherein the monitoring system comprises a raw water monitoring system, a sedimentation tank monitoring system and a lime milk monitoring system; the raw water monitoring system comprises a first online flowmeter and a first online PH meter, wherein the input end and the output end of the first online flowmeter and the first online PH meter are respectively connected with the raw water input end and the input end of the control system.
Preferably, the sedimentation tank monitoring system comprises a second online flowmeter and a second online PH meter, and the input end and the output end of the second online flowmeter and the second online PH meter are respectively connected with the output end of the sedimentation tank and the input end of the control system.
Preferably, the lime milk monitoring system comprises a third online PH meter, and the input end and the output end of the third online PH meter are respectively connected with the lime milk storage tank and the control system.
Preferably, the control system is a PLC control system.
In a second aspect, the invention provides an operation method of a full-automatic lime milk adding system of a tap water plant, which is characterized by comprising the following steps:
A. determination of the flow Q at the raw water input by means of a first on-line flowmeter1；
B. Measuring the pH value P of the raw water input end by utilizing a first online pH meter1；
C. Determining the flow Q of the sedimentation tank using a second in-line flow meter2；
D. Determining the pH value P of the sedimentation tank by using a second online pH meter2；
E. Measuring pH value P of lime milk storage pool by using third online pH meter3；
F. Sending the values obtained in the steps A, B and E to a control system, calculating the lime milk adding amount by the control system according to the measured result, sending the adding amount to a variable frequency pump in a first adding device, and outputting the lime milk to a coagulation tank by the variable frequency pump according to the adding amount;
G. and (4) sending the values obtained in the steps C, D and E to a control system, calculating the lime milk adding amount by the control system according to the measured result, sending the adding amount to a variable frequency pump in the second adding device, and outputting the lime milk to a sedimentation tank by the variable frequency pump according to the adding amount.
Preferably, the method for calculating the lime milk adding amount in the step F specifically comprises the following steps:
hydroxide ion concentration of raw water
Hydroxide ion concentration of lime milk
Target hydroxide ion concentration to be achieved by the filter tank
The adding amount of the first adding device
Wherein, P0Is the target pH value to be reached by the filter tank.
Preferably, the method for calculating the lime milk adding amount in the step G specifically comprises the following steps:
concentration of hydroxyl ions in the sedimentation tank
Hydroxide ion concentration of lime milk
Target hydroxide ion concentration to be achieved by the filter tank
Dosage of the second feeding device
Compared with the prior art, the invention has the beneficial effects that: the invention provides double guarantee for the pH value of the final effluent to reach the set target value by arranging two lime adding systems, so that the pH value of the effluent is not influenced by the fluctuation of the pH value of raw water, the stability of the pH value of the effluent is improved, the adding amount of lime milk is reduced, the operation period and the service life of related facilities are prolonged, and the invention has obvious economic benefit.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying drawings, in which the description of the invention is given by way of illustration and not of limitation. The various embodiments may be combined with each other to form other embodiments not shown in the following description.
In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.
Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a number" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
As shown in fig. 1, a full-automatic lime milk adding system for a tap water plant comprises a raw water input end 1, a treatment system 3, a control system 2 and a water outlet end 6, wherein the treatment system 3 comprises a coagulation tank 305, a filtration tank 306, a lime milk storage tank 301, a first adding device 302 and a second adding device 303, one end of the coagulation tank 305 is connected with the raw water input end 1, the other end of the coagulation tank is connected with the filtration tank 306, the filtration tank 306 is connected with the water outlet end 6, one end of the first adding device 302 is connected with the coagulation tank 305, the other end of the first adding device is connected with the control system 2, one end of the second adding device 303 is connected with the filtration tank 306, the other end of the second adding device is connected with the control system 2, and the first adding device 302 and the second adding device 303.
The first adding device 302 and the second adding device 303 respectively comprise at least one variable frequency pump 304, and the variable frequency pump 304 is used for adding lime milk into a coagulation tank 305 or a filtering tank 306 respectively; the input end of the variable frequency pump 304 is connected with the lime milk storage pool 301 and the control system 3; the output end of a variable frequency pump 304 in the first adding device 302 is connected with a coagulation tank 305; the output end of the variable frequency pump 304 in the second dosing device 303 is connected with the filtering tank 306.
In a specific embodiment, two variable frequency pumps 304 are respectively arranged in the first dosing device 302 and the second dosing device 303, the two variable frequency pumps are controlled by the control system 2 to alternately operate for 24 to 36 hours, and the variable frequency pumps automatically perform backwashing each time the variable frequency pumps stop operating.
The treatment system 3 further comprises a sedimentation tank 4 and a clean water tank 5, wherein the sedimentation tank 4 is arranged between the coagulation tank 305 and the filtration tank 306, and the clean water tank 5 is arranged between the filtration tank 306 and the water outlet end 6.
The lime milk adding system also comprises a monitoring system 7, and the monitoring system 7 comprises a raw water monitoring system, a sedimentation tank monitoring system and a lime milk monitoring system; the raw water monitoring system comprises a first online flowmeter 702 and a first online PH meter 701, wherein the input end and the output end of the first online flowmeter 702 and the first online PH meter 701 are respectively connected with the raw water input end 1 and the input end of the control system 2.
The sedimentation tank monitoring system comprises a second online flowmeter 703 and a second online PH meter 704, wherein the input end and the output end of the second online flowmeter 703 and the second online PH meter 704 are respectively connected with the output end of the sedimentation tank 4 and the input end of the control system 2.
The lime milk monitoring system comprises a third online pH meter 705, and the input end and the output end of the third online pH meter 705 are respectively connected with the lime milk storage tank 301 and the control system 2.
Further, the control system 2 is a PLC control system.
The invention has the beneficial effects that:
(1) the whole lime milk adding system is controlled by a PLC control system, so that the stable operation of the whole system is ensured;
(2) the dual control is realized, namely on the basis that the lime milk adding system is arranged at the raw water input end, the lime milk adding system is additionally arranged at the subsequent effluent of the sedimentation tank, so that the dual guarantee that the pH value of the final effluent reaches the set target value is realized, the pH value of the effluent is stable, and the adding amount of the lime milk can be reduced;
(3) the automation degree is high, the lime milk is added in a full-automatic way, and the maintenance of related facilities and other work is done by workers;
(4) the method is suitable for newly built water plants and the excavation and submergence transformation of the current water plants, and the original process structure is not required to be changed for the excavation and submergence transformation of the current water plants;
(5) the pH value of the effluent is not influenced by the fluctuation of the pH value of the raw water, the stability of the pH value of the effluent is improved, the operation period and the service life of related facilities are prolonged, and the method has obvious economic benefit.
In a second aspect, the invention provides an operation method of a full-automatic lime milk adding system of a tap water plant, which is characterized by comprising the following steps:
A. determination of the flow Q of the raw Water input 1 by means of the first in-line flowmeter 7021；
B. The pH value P of the raw water input end 1 is measured by utilizing a first online pH meter 7011；
C. Determination of the flow Q of the sedimentation tank 4 by means of a second in-line flow meter 7032；
D. The pH value P of the sedimentation tank 4 is measured by a second on-line pH meter 7042；
E. The pH value P of the lime milk storage pool 301 is measured by utilizing a third online pH meter 7053；
F. Sending the values obtained in the steps A, B and E to a control system 2, calculating the lime milk adding amount by the control system 2 according to the measured result, sending the adding amount to a variable frequency pump 304 in a first adding device 302, and outputting the lime milk to a coagulation tank 305 by the variable frequency pump 304 according to the adding amount;
G. sending the values obtained in the steps C, D and E to a control system 2, calculating the lime milk adding amount by the control system 2 according to the measured result, sending the adding amount to a variable frequency pump 304 in a second adding device 303, and outputting the lime milk to a sedimentation tank 4 by the variable frequency pump 304 according to the adding amount.
Further, the calculation method of the lime milk adding amount in the step F is specifically as follows:
hydroxide ion concentration of raw water
Hydroxide ion concentration of lime milk
Target hydroxide ion concentration to be achieved by the filter tank
The dosage of the first adding device 302
Wherein, P0Is the target pH value to be reached by the filter tank.
Further, the calculation method of the lime milk adding amount in the step G is specifically as follows:
hydroxyl ions of the sedimentation tankConcentration of
Hydroxide ion concentration of lime milk
Target hydroxide ion concentration to be achieved by the filter tank
The adding amount of the second adding device 303
The invention establishes a mathematical model of the lime milk adding amount, the raw water flow and the pH value, and determines the optimal lime milk adding amount of the raw water with different water amounts and different pH values.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The utility model provides a full-automatic lime breast dosing system of water works which characterized in that: including raw water input end, processing system, control system and play water end, processing system includes coagulating basin, filtering ponds, lime breast storage tank, first feeder apparatus and second and throws the feeder apparatus, coagulating basin one end links to each other with the raw water input end, and the other end links to each other with the filtering ponds, the filtering ponds link to each other with a water end, first feeder apparatus one end links to each other with the coagulating basins, and the other end links to each other with control system, the second is thrown feeder apparatus one end and is linked to each other with the filtering ponds, and the other end links to each other with control system, first feeder apparatus and second are thrown the feeder apparatus and are linked to each other with lime breast storage tank respectively.
2. The full-automatic lime milk dosing system of the tap water plant according to claim 1, characterized in that: the first feeding device and the second feeding device respectively comprise at least one variable frequency pump, and the variable frequency pumps are used for respectively feeding the lime milk into a coagulation tank or a filtering tank; the input end of the variable frequency pump is connected with the lime milk storage tank and the control system; the output end of a variable frequency pump in the first feeding device is connected with the coagulation tank; and the output end of the variable frequency pump in the second feeding device is connected with the filtering tank.
3. The full-automatic lime milk dosing system of the tap water plant according to claim 1, characterized in that: the treatment system further comprises a sedimentation tank and a clean water tank, the sedimentation tank is arranged between the coagulation tank and the filter tank, and the clean water tank is arranged between the filter tank and the water outlet end.
4. The full-automatic lime milk dosing system of the tap water plant according to claim 1, characterized in that: the system also comprises a monitoring system, wherein the monitoring system comprises a raw water monitoring system, a sedimentation tank monitoring system and a lime milk monitoring system; the raw water monitoring system comprises a first online flowmeter and a first online PH meter, wherein the input end and the output end of the first online flowmeter and the first online PH meter are respectively connected with the raw water input end and the input end of the control system.
5. The full-automatic lime milk dosing system of the tap water plant according to claim 4, characterized in that: the sedimentation tank monitoring system comprises a second online flowmeter and a second online PH meter, wherein the input end and the output end of the second online flowmeter and the second online PH meter are respectively connected with the output end of the sedimentation tank and the input end of the control system.
6. The full-automatic lime milk dosing system of the tap water plant according to claim 4, characterized in that: the lime milk monitoring system comprises a third online pH meter, and the input end and the output end of the third online pH meter are respectively connected with the lime milk storage tank and the control system.
7. The full-automatic lime milk dosing system of the tap water plant according to claim 1, characterized in that: the control system is a PLC control system.
8. An operation method of a full-automatic lime milk adding system of a tap water plant is characterized by comprising the following steps:
A. determination of the flow Q at the raw water input by means of a first on-line flowmeter1；
B. Measuring the pH value P of the raw water input end by utilizing a first online pH meter1；
C. Determining the flow Q of the sedimentation tank using a second in-line flow meter2；
D. Determining the pH value P of the sedimentation tank by using a second online pH meter2；
E. Measuring pH value P of lime milk storage pool by using third online pH meter3；
F. Sending the values obtained in the steps A, B and E to a control system, calculating the lime milk adding amount by the control system according to the measured result, sending the adding amount to a variable frequency pump in a first adding device, and outputting the lime milk to a coagulation tank by the variable frequency pump according to the adding amount;
G. and (4) sending the values obtained in the steps C, D and E to a control system, calculating the lime milk adding amount by the control system according to the measured result, sending the adding amount to a variable frequency pump in the second adding device, and outputting the lime milk to a sedimentation tank by the variable frequency pump according to the adding amount.
9. The operation method of the full-automatic lime milk adding system of the tap water plant according to claim 8, characterized in that: the method for calculating the adding amount of the lime milk in the step F comprises the following specific steps:
hydroxide ion concentration of raw water
Hydroxide ion concentration of lime milk
Target hydroxide ion concentration to be achieved by the filter tank
The adding amount of the first adding device
Wherein, P0Is the target pH value to be reached by the filter tank.
10. The operation method of the full-automatic lime milk dosing system of the water works according to claim 9, characterized in that: the method for calculating the adding amount of the lime milk in the step G comprises the following specific steps:
concentration of hydroxyl ions in the sedimentation tank
Hydroxide ion concentration of lime milk
Target hydroxide ion concentration to be achieved by the filter tank
Dosage of the second feeding device
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| CN202010721660.4A CN112062251A (en) | 2020-07-24 | 2020-07-24 | Full-automatic lime milk adding system for water works and operation method |
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| CN202010721660.4A CN112062251A (en) | 2020-07-24 | 2020-07-24 | Full-automatic lime milk adding system for water works and operation method |
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Citations (6)
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| CA2169248A1 (en) * | 1996-02-09 | 1997-08-10 | Etienne Prive | Automatic chemical monitor and control system for swimming pools |
| CN200967783Y (en) * | 2006-11-17 | 2007-10-31 | 辽宁三和环境工程有限公司 | Acid alkali waste water treatment system |
| CN102020345A (en) * | 2010-11-10 | 2011-04-20 | 杭州天健流体控制设备有限公司上虞分公司 | Application of calcium hydroxide in drink water treatment |
| CN102838179A (en) * | 2012-10-08 | 2012-12-26 | 北京中环嘉诚环境工程有限公司 | Control method for automatic drug adding device in sewage treatment system |
| CN205442864U (en) * | 2015-12-30 | 2016-08-10 | 桂林斯壮微电子有限责任公司 | Automatic processing system of sewage |
| CN108285227A (en) * | 2018-04-04 | 2018-07-17 | 深圳市利源水务设计咨询有限公司 | A kind of dosing system and its addition method improving water factory's water outlet pH value |
-
2020
- 2020-07-24 CN CN202010721660.4A patent/CN112062251A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2169248A1 (en) * | 1996-02-09 | 1997-08-10 | Etienne Prive | Automatic chemical monitor and control system for swimming pools |
| CN200967783Y (en) * | 2006-11-17 | 2007-10-31 | 辽宁三和环境工程有限公司 | Acid alkali waste water treatment system |
| CN102020345A (en) * | 2010-11-10 | 2011-04-20 | 杭州天健流体控制设备有限公司上虞分公司 | Application of calcium hydroxide in drink water treatment |
| CN102838179A (en) * | 2012-10-08 | 2012-12-26 | 北京中环嘉诚环境工程有限公司 | Control method for automatic drug adding device in sewage treatment system |
| CN205442864U (en) * | 2015-12-30 | 2016-08-10 | 桂林斯壮微电子有限责任公司 | Automatic processing system of sewage |
| CN108285227A (en) * | 2018-04-04 | 2018-07-17 | 深圳市利源水务设计咨询有限公司 | A kind of dosing system and its addition method improving water factory's water outlet pH value |
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Application publication date: 20201211 |