CN218841805U - Chemical adding control system for mine water treatment - Google Patents
Chemical adding control system for mine water treatment Download PDFInfo
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- CN218841805U CN218841805U CN202320024041.9U CN202320024041U CN218841805U CN 218841805 U CN218841805 U CN 218841805U CN 202320024041 U CN202320024041 U CN 202320024041U CN 218841805 U CN218841805 U CN 218841805U
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Abstract
The utility model relates to a medicine control system for mine water treatment, medicine control system contains: the device comprises a homogenizing adjusting tank (100), a coagulation reaction tank (200), a flocculation reaction tank (300), a coagulant medicine box (400), a flocculant medicine box (500), a sedimentation tank (600), a PLC (programmable logic controller) control system (700) and a human-computer interface (800), wherein in the homogenizing adjusting tank (100), a sludge concentration meter (101) is used to replace a turbidimeter in the prior art, and in a pipeline from the homogenizing adjusting tank (100) to the coagulation tank (200), a pH meter (11) is additionally used. The utility model discloses can the accurate control coagulant throw the volume of adding to reduce coagulant's throw volume with reduce cost on the whole, and ensure out water stabilization of water quality in order to realize discharging to reach standard.
Description
Technical Field
The utility model relates to a coal mine water treatment field especially relates to a medicine control system that adds for mine water treatment.
Background
The current energy use structure of China is dominated by coal, and the domestic coal yield is very high. In the coal mining process, a large amount of mine water used as wastewater is generated, and the mine water contains more suspended matters such as coal slime and the like and can be discharged or recycled after being treated. Most of the existing mine water treatment systems for coal mines realize automatic treatment, wherein coagulant and flocculant are added into mine water to remove suspended matters in the mine water in a precipitation mode. However, these systems are generally simpler in design and are not perfect. For example, the coagulant is added at a fixed amount, or the amount is manually adjusted by observing the water discharge condition manually, and the degree of adjustment varies from person to person. In addition, the coagulant adding time has large lag, and the coagulant cannot adapt to the condition of large fluctuation of the quality of the inlet water. Therefore, the effluent quality is unstable, and the dosing is excessively wasted.
Chinese patent CN 201470161 discloses a mine water purification treatment automatic dosing device, which has increased turbidity and flow sensor at the water inlet end to according to the inflow and turbidity dynamic adjustment dosing pump frequency. This improves dosing accuracy to some extent and improves the degree of automation, but it still suffers from three problems:
firstly, the turbidimeter is adopted at the water inlet end, which is not suitable for mine water which contains high-concentration coal slime and has poor light transmittance,
secondly, in practical engineering application, the dosage of the dosing metering pump is changed and inaccurate due to factors such as pipeline pollution and blockage, so that the quality of effluent water is unstable,
thirdly, because the working frequency and the dosage of the adopted dosing metering pump are generally not in a linear relation, especially at low frequency, the accuracy of changing the dosage by controlling the frequency is poor.
Chinese patent CN 210595405 discloses an automatic chemical feeding system for mine water underground treatment, which is based on the former patent, a turbidimeter is added at the water outlet end, and the feeding amount is adjusted in a feedforward and feedback superposition mode. This solves the unstable condition of the effluent to a certain extent. However, it still has the following two problems:
firstly, the water inlet end still adopts a turbidimeter;
secondly, the feedback of the effluent turbidimeter has a longer time lag, and the problem of untimely use of the feedback to correct the dosage of the dosing pump can be caused.
In addition, the pH fluctuation of the mine water can influence the adding effect of a coagulant, and further influence the effluent quality. In the prior art, effective identification and control are not performed, and further accurate control of the dosage cannot be achieved.
Therefore, a new chemical adding control system for mine water treatment needs to be developed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Technical problem
The utility model aims at providing a neotype medicine control system that adds for mine water treatment, it can accurate control the throwing of coagulant add to reduce the throwing volume of coagulant on the whole with reduce cost, and ensure out water stabilization of water quality in order to realize discharge to reach standard.
Technical scheme
In one aspect, the utility model provides a medicine control system for mine water treatment, a serial communication port, medicine control system contains:
the homogenizing adjusting tank 100 is provided with a homogenizing adjusting tank,
the coagulation reaction tank 200 is provided with a coagulation reaction tank,
the flocculation reaction tank (300) is provided with a flocculation reaction tank,
a coagulant medicine box 400 is provided,
flocculant medical kit 500
The sedimentation tank (600) is provided with a sedimentation tank,
the human-machine interface (800) is,
wherein a sludge concentration meter 101, a static pressure type liquid level meter 102 and a lifting pump 103 are arranged in the homogenizing adjusting tank 100,
the outlet of the lift pump 103 is connected with the coagulation reaction tank 200 through a pipe, the pipe is provided with a pH meter 11 and a first flow meter 12,
wherein a coagulation stirrer 201 is arranged in the coagulation reaction tank 200, the coagulation reaction tank 200 is connected with the bottom of the flocculation reaction tank 300 through a bottom opening,
wherein the bottom of the coagulant medicine chest 400 is connected with the inlet of a coagulant medicine feeding pump 13 through a pipeline, the outlet of the coagulant medicine feeding pump 13 is connected with the coagulation reaction tank 200 through a pipeline, the pipeline is provided with a second flowmeter 14,
wherein a flocculation stirrer 301 is arranged in the flocculation reaction tank 300, the top outlet of the flocculation reaction tank 300 is connected with the sedimentation tank 600 through a pipeline,
wherein the bottom of the flocculant medicine box 500 is connected with the inlet of a flocculant dosing pump 15 through a pipeline, the outlet of the flocculant dosing pump 15 is connected with the flocculation reaction tank 300 through a pipeline,
wherein the top outlet of the sedimentation tank 600 is connected with an external drainage pipeline, the external drainage pipeline is provided with a turbidimeter 16, a qualified water discharge valve 17 and an unqualified water discharge valve 18,
the bottom of the sedimentation tank 600 is connected with a sludge pump 19 through a pipeline;
wherein the PLC control system 700 is connected with the sludge concentration meter 101, the static pressure type liquid level meter 102, the pH meter 11, the first flow meter 12, the second flow meter 14 and the turbidity meter 16 through cables for collecting the measurement data of these sensors in real time, and
the PLC control system 700 is also connected with the lifting pump 103, the coagulation mixer 201, the coagulant dosing pump 13, the flocculation mixer 301, the flocculant dosing pump 15, the qualified water discharge valve 17, the unqualified water discharge valve 18 and the sludge discharge pump 19 through cables, and is used for controlling the opening and closing of the devices; and
the human-machine interface 800 is connected to the PLC control system 700 through a cable.
In one embodiment, the sludge concentration meter 101 is a range adaptive sludge concentration meter that measures sludge concentrations in the range of 0 to 20g/L.
In one embodiment, the coagulant dosing pump 13 is a plastic-lined or stainless steel centrifugal pump capable of variable frequency operation,
the motor in the centrifugal pump is a variable frequency motor.
In one embodiment, the first flow meter 12 and the second flow meter 14 are electromagnetic flow meters.
In one embodiment, the qualified water drain valve 17 and the unqualified water drain valve 18 are electrically operated valves.
In one embodiment, the human-machine interface 800 includes a liquid crystal display, a touch mouse, and a keyboard.
Advantageous effects
Compared with the prior art, the dosing control system for mine water treatment of the utility model is improved to accurately control the dosing amount of the coagulant, thereby reducing the dosing amount of the coagulant on the whole to reduce the cost and ensuring the stable quality of the effluent water to realize the discharge after reaching the standard,
(1) In the homogenizing adjusting tank, a sludge concentration meter is used for replacing a turbidimeter so as to more accurately determine the concentration of suspended matters in the mine water;
(2) In the pipeline from the homogenization tank to the coagulation tank, a pH meter is additionally used, which is used to measure the pH value in order to determine the appropriate coagulant dosing.
Furthermore, the utility model discloses a add medicine control system for mine water treatment can further improve above-mentioned technological effect through as follows.
For a coagulant dosing pump, a centrifugal pump capable of running in a variable frequency mode is used for replacing a conventional dosing metering pump;
an electromagnetic flow meter is arranged in an outlet pipeline of the coagulant dosing pump to accurately measure the actual dosing amount of the coagulant.
Drawings
Fig. 1 is a schematic diagram of a dosing control system for mine water treatment according to an embodiment of the present invention.
Reference numerals
100 homogeneous regulating tank
101 sludge concentration meter
102 static pressure type liquid level meter
103 lift pump
200 coagulation reaction tank
201 coagulating basin mixer
300 flocculation reaction tank
301 flocculation tank mixer
400 coagulant medicine chest
500 flocculating agent medicine chest
600 sedimentation tank
700PLC control system
800 human-machine interface
11pH meter
12 first flowmeter
13 coagulant adding pump
14 second flowmeter
15 flocculating agent dosing pump
16 turbidimeter
17 qualified water discharge valve
18 unqualified water discharge valve
19 sludge pump
Detailed Description
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. The terms or words used in the present specification and claims should not be construed restrictively as definitions of ordinary and dictionary, and should be construed as meanings and concepts corresponding to technical ideas of the present invention on the basis of the principle that an inventor can appropriately define concepts of the terms to describe the present invention in the best possible way.
As used herein, "%" means weight percent unless otherwise specified.
According to one aspect, the utility model provides a novel a add medicine control system for mine water treatment. The components and operating mechanism of the medicated control system are described in detail below.
Referring to fig. 1, according to an embodiment of the present invention, mine water is discharged from an upper portion of a homogenizing adjustment tank 100. The sludge concentration of the mine water can usually be within a variation range of 100 mg/L-6000 mg/L, and the pH value can be within a variation range of 4-9.
The homogeneous adjusting tank 100 is internally provided with a sludge concentration meter 101, and the measured sludge concentration value is transmitted into the PLC control system 700 as a signal in a 4-20mA mode. The PLC refers to a programmable logic controller. The sludge concentration meter 101 is a range self-adaptive sludge concentration meter, and the measured sludge concentration range is 0 to 20g/L.
The interior of the homogenizing adjusting tank 100 is also provided with a static pressure type liquid level meter 102, and a measuring signal of the static pressure type liquid level meter is transmitted to the PLC control system 700 in a 4-20mA mode. The PLC control system 700 sets high and low level limits via the human machine interface 800. At a high liquid level, the PLC control system 700 will start the lift pump 103 to start working; at low levels, the PLC control system 700 will cause the lift pump 103 to stop operating.
The lift pump 103 is used for pumping the mine water after the homogenization treatment in the homogenization adjustment tank 100 to the coagulation reaction tank 200.
A pipe connected to an outlet of the lift pump 103 is installed with a pH meter 11 and a first flow meter 12.
The pH meter 11 is used for measuring the pH value and transmitting the pH value to the PLC control system 700 in a 4-20mA mode so as to provide the pH value for the PLC control system 700.
The first flowmeter 12 is used for measuring the flow of mine water from the lift pump 103 and transmitting the mine water into the PLC control system 700 in a 4-20mA mode. The first flow meter 12 may be an electromagnetic flow meter.
The coagulant medicine box 400 is used to store coagulant. The PLC control system 700 calculates the amount of coagulant to be added as a target value for the operation of the flow controller (using PID method) of the coagulant adding pump 13, based on the sludge concentration value provided by the sludge concentration meter 101, the inflow rate of mine water, and the inflow pH value of mine water. The PID system is a proportional-integral-derivative (proportional-integral-derivative) system.
The coagulant dosing pump 13 is a plastic-lined or stainless steel centrifugal pump capable of running in a variable frequency manner, and a motor in the centrifugal pump is a variable frequency motor
The coagulant can be any one or more of PAC (polyaluminium chloride), polyferric sulfate and ferric trichloride. Preferably PAC is used as coagulant. In addition, when the pH of the feed water is acidic, the amount of PAC added needs to be increased to achieve the same purification effect as in the case where the pH of the feed water is alkaline.
A second flowmeter 14 is arranged in a pipeline connected with the outlet of the coagulant dosing pump 13 and used for measuring the flow of the coagulant from the coagulant dosing pump 13 and transmitting the flow to the PLC control system 700 in a 4-20mA mode to be used as a process value of PID constant flow operation of the coagulant dosing pump 13. The second flow meter 14 may be an electromagnetic flow meter.
The PLC control system 700 collects the concentration, pH value and flow of the influent sludge in real time, calculates the coagulant adding amount according to laboratory data, and controls the operation of the coagulant adding pump 13 in a PID constant flow mode, so that the actual adding amount detected by the second flow meter 14 is consistent with the calculated adding amount.
Therefore, the chemical feeding control system can adapt to the change of the quality and the quantity of mine water in time, ensures the stability of the effluent quality of the system, avoids the condition of insufficient or excessive chemical feeding amount, avoids the waste of excessive chemical feeding, and avoids the substandard effluent caused by insufficient chemical feeding amount when the quality and the quantity of water fluctuate.
In the long-term operation process of the dosing control system, if a dosing pipeline of a coagulant is polluted and blocked, the concentration of the coagulant changes, the liquid level of a coagulant medicine box changes or the performance of a coagulant dosing pump changes, the PID program of the PLC control system 700 can adapt to the changes in time, so that the actual dosing amount of the coagulant is always consistent with the calculated dosing amount, and the purpose of accurately controlling the dosing amount in real time is achieved.
The coagulation reaction tank 200 is equipped with a coagulation mixer 201 which is started simultaneously with the coagulant addition pump 13, and the rotation speed is generally 90-120rpm. The coagulation blender 201 uniformly mixes the mine water and the coagulant to obtain a first mixture. The first mixture automatically flows into the flocculation reaction tank 300 from the bottom of the coagulation reaction tank 200.
The flocculant medicine box 500 is used for storing a flocculant and adding the flocculant into the flocculation reaction tank 300 through a flocculant adding pump 15. The flocculant dosing pump 15 may generally be a mechanical diaphragm pump and may dose flocculant at a fixed dose (10-15 ppm).
The flocculating agent may typically be PAM (polyacrylamide), preferably anionic PAM.
The flocculant dosing pump 15 and a flocculation stirrer 301 described below are controlled by a PLC control system 700, and started and stopped simultaneously with the equalizing basin lift pump 103.
The flocculation tank 300 is equipped with a flocculation agitator 301, which is typically rotated at 45-60rpm. The flocculation stirrer 301 uniformly mixes the first mixture and the flocculant in the flocculation reaction tank 300 to perform flocculation reaction, thereby obtaining a second mixture.
The settling tank 600 is adapted to receive the second mixture. The second mixture automatically flows into the sedimentation tank 600 from the upper drainage pipe of the flocculation reaction tank 300. In the sedimentation tank 600, the second mixture is subjected to solid-liquid separation under the action of gravity to obtain supernatant and sludge, wherein the supernatant is discharged from a top pipeline, and the sludge is settled to the bottom of the sedimentation tank 600.
Sludge at the bottom of the sedimentation tank 600 may be periodically discharged into the sludge treatment system by the sludge discharge pump 19.
A turbidity meter 16 for measuring turbidity of the supernatant is installed in the drain line above the settling tank 600. The measured turbidity is transmitted as a signal to the PLC control system 700 in the form of 4-20 mA.
The PLC control system 700 manually sets the effluent turbidity limit through the human-machine interface 800. If the turbidity of the effluent is lower than the limit value, the PLC control system 700 controls the qualified water discharge valve 17 to be opened, and closes the unqualified water discharge valve 18 to realize the discharge after reaching the standard. On the contrary, if the turbidity of the effluent is higher than the limit value, the unqualified water discharge valve 18 is controlled to be opened, the qualified water discharge valve 17 is closed, and the unqualified water returns to the homogenizing adjusting tank 100 to prevent excessive discharge.
The qualified water discharge valve 17 and the unqualified water discharge valve 18 may be electrically operated valves.
The PLC control system 700 is connected with the sludge concentration meter 101, the static pressure type liquid level meter 102, the pH meter 11, the first flow meter 12, the second flow meter 14 and the turbidity meter 16 through cables for collecting the measurement data of these sensors in real time, and
the PLC control system 700 is further connected to the lift pump 103, the coagulation mixer 201, the coagulant dosing pump 13, the flocculation mixer 301, the flocculant dosing pump 15, the qualified water discharge valve 17, the unqualified water discharge valve 18, and the sludge discharge pump 19 through cables, and is configured to control the on and off of these devices. The connection mechanism of the PLC control system 700 to each device is as described above.
In the PLC control system 700, a PID mode (i.e., a dynamic feedback mode) may be used to replace the static feedback-free mode in the prior art, and the coagulant feeding pump 13 is controlled so that the actual feeding amount of the coagulant is consistent with the feeding amount calculated by the PLC control system.
The human-machine interface 800 includes a liquid crystal display, a touch mouse, and a keyboard. The human-machine interface 800 enables an operator to observe the operating state, process parameters and sensor data of the process equipment of the system in real time, and adjust the process parameters such as upper and lower liquid level limits, water discharge turbidity limits, dosing excess coefficient and the like according to the operating conditions.
In one embodiment, the operator may set a dosing overdose factor, which defaults to 1, via the human-machine interface 800. And if the turbidity of the effluent is close to or higher than the set value of the turbidity of the effluent after the system runs for a period of time, the excess coefficient is increased, and the calculated addition amount and the actual addition amount of the coagulant are amplified in equal proportion according to the excess coefficient, so that the turbidity value of the effluent is reduced to a safe region. On the contrary, if the turbidity of the effluent is far lower than the set value, the excess coefficient is properly reduced, and the calculated addition amount and the actual addition amount of the coagulant are correspondingly reduced, so that the addition amount of the medicament is saved. The coefficient is adjusted more frequently only at the initial stage of system debugging, and is not modified frequently any more after the system runs stably.
Examples
The embodiments of the present invention may be modified into various other forms and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more fully describe the invention to those of ordinary skill in the art.
The experimental procedures in the following examples are generally conventional in the art or according to the manufacturer's recommendations if specific conditions are not noted; the raw materials and equipment used are those commercially available from conventional markets and the like unless otherwise specified.
The equipment and agents used in the examples are as follows.
The measuring range of the sludge concentration meter 101 is 0-20g/L.
The pH meter 11 is a conventional pH meter.
The coagulant used in the coagulant tank 400 is PAC (polyaluminium chloride) solution with the mass concentration of 10%.
The coagulant dosing pump 13 adopts a 304 stainless steel centrifugal pump which can be operated in a variable frequency mode.
The flocculant used in the flocculant medicine box 500 is PAM (polyacrylamide) solution, and the mass concentration is 1 per mill.
The flocculant dosing pump 15 adopts a mechanical diaphragm metering pump, and the fixed dosing amount is set to be 15ppm.
The first flowmeter 12 and the second flowmeter 14 are electromagnetic flowmeters.
The coagulant reaction tank 200 is a steel concrete structure, wherein a paddle stirrer is adopted as a coagulant stirrer 201 arranged in the steel concrete structure, and the rotating speed is 90rpm.
The flocculant reaction tank 300 is of a reinforced concrete structure, wherein a paddle stirrer is adopted as a flocculant stirrer 301 which is installed, and the rotating speed is 45rpm.
The sedimentation tank 600 adopts a vertical sedimentation tank.
The qualified water discharge valve 17 and the unqualified water discharge valve 18 are electrically operated valves.
The turbidimeter 16 has a range of 0 to 100NTU.
The PLC control system 700 adopts Siemens S7 200Smart PLC, and comprises a power supply, a CPU module, a digital input/output module and an analog input/output module.
The human-machine interface 800 employs a siemens Smart700IE touch screen.
Example 1 (use of a sludge concentration meter and increase of sludge concentration in the second period)
Referring to fig. 1, the chemical adding control system for mine water treatment comprises a homogeneous regulating tank 100, a coagulation reaction tank 200, a flocculation reaction tank 300, a coagulant medicine tank 400, a flocculant medicine tank 500, a sedimentation tank 600, a PLC control system 700, a human-computer interface 800, and matched equipment such as pipelines, valves, flowmeters, pH meters, chemical adding pumps and sludge discharge pumps.
The mine water from the underground is purified by adding chemicals. Specifically, the mine water enters the homogenizing adjusting tank 100 from the upper part. The PLC control system 700 collects liquid level information in the homogenization equalizing basin 100 in real time through the liquid level meter 102, and controls the lift pump 103 to start up when a high liquid level is reached.
The mine water flows into the coagulation reaction tank 200 through the pH meter 11 and the first flow meter 12 through pipelines. The mine water and the coagulant from the coagulant medicine box 400 are fully stirred and mixed in the coagulation reaction tank 200 through the coagulation stirrer 201 to obtain a first mixture, and the first mixture flows into the flocculation reaction tank 300 from the bottom opening.
In the flocculation reaction tank 300, the first mixture and the flocculant from the flocculant medicine box 500 are subjected to flocculation reaction under stirring by the flocculation stirrer 301, and a second mixture is obtained.
The second mixture flows automatically into the sedimentation tank 600 from the top drain line of the flocculation tank 300. The turbidity of the supernatant was measured as effluent.
Two consecutive periods of time (3 hr each) were carried out, wherein the influent sludge concentration increased from 3996mg/L to 6000mg/L for the second period of time, with the remaining influent conditions being essentially unchanged.
Table 1a below shows the coagulant (PAC) dosing amount versus effluent quality for the increased influent sludge concentration for the second time period.
TABLE 1a
| Parameter(s) | Unit of | A first period of time | For a second period of time | |
| pH value of inlet water | 8.8 | 8.8 | ||
| Inflow rate of water | m 3 / |
500 | 500 | |
| Turbidity of inlet water | NTU | 1500 | 1510 | |
| Influent sludge concentration | mg/L | 3996 | 6000 | |
| PAC dosage | ppm | 105 | 155 | |
| | ppm | 15 | 15 | |
| Turbidity of the effluent | NTU | 2.5 | 2.6 |
As can be seen from Table 1a, when the influent sludge concentration value in the second period of time increases to 6000mg/L, the PAC dosage increases accordingly, so that the effluent turbidity is substantially unchanged.
Comparative example 1 (using a turbidimeter and increasing the sludge concentration during the second period)
Compared with example 1, the apparatus was the same except that the turbidity meter was used instead of the sludge concentration meter.
Similar to example 1, two consecutive periods of operation were carried out, wherein the influent sludge concentration increased from 3996mg/L to 6000mg/L for the second period, with the remaining influent conditions being essentially unchanged.
Table 1b below shows the coagulant (PAC) dosing amount versus the effluent quality in the case where the influent pH for the second period of time becomes alkaline (8.8).
TABLE 1b
| Parameter(s) | Unit of | A first period of time | For a second period of time | |
| pH value of inlet water | 8.8 | 8.8 | ||
| Inflow rate of water | m 3 / |
500 | 500 | |
| Turbidity of inlet water | NTU | 1500 | 1510 | |
| Influent sludge concentration | mg/L | 3996 | 6000 | |
| PAC dosage | ppm | 105 | 106 | |
| | ppm | 15 | 15 | |
| Turbidity of the effluent | NTU | 2.5 | 36 |
As can be seen from Table 1b, when the intake water quality is measured by using the turbidity meter, although the sludge concentration of the intake water is significantly increased in the second period, the turbidity of the intake water is not greatly changed, and thus the increment of suspended matters in the water is not truly reflected. Further, the PAC dosing amount is also caused to vary little. Because PAC dosage is not increased in time, effluent turbidity is greatly improved, and water quality is deteriorated.
According to the comparison of above table 1a and 1b, can obviously see out, replace the turbidimeter through using the mud concentration meter, the utility model discloses a dosing control system can survey the concentration of mine aquatic suspended solid more accurately to in time change the input volume of coagulant, ensure out water stabilization of quality of water in order to realize discharge to reach standard.
Example 2 (Using a pH meter and allowing the pH to decrease for a second period of time)
The apparatus used was the same as in example 1.
Two successive periods (3 hr each) were carried out, wherein the feed water pH for the second period (3 hr) was changed to acidic (5.3) and the rest of the feed water conditions were essentially the same.
Table 2a below shows the coagulant (PAC) dosing amount versus the effluent quality in case the influent pH for the second period of time becomes acidic (5.3).
TABLE 2a
| Parameter(s) | Unit of | A first period of time | For a second period of time | |
| pH value of inlet water | 8.8 | 5.3 | ||
| Inflow rate of water | m 3 / |
500 | 500 | |
| Turbidity of inlet water | NTU | 1500 | 1500 | |
| Influent sludge concentration | mg/L | 3996 | 3995 | |
| PAC dosage | ppm | 105 | 120 | |
| | ppm | 15 | 15 | |
| Turbidity of the effluent | NTU | 2.5 | 2.6 |
As can be seen from table 2a, in the case where the pH of the inlet water in the second period becomes 5.3 (weakly acidic range), the PAC dosage is increased more than that in the first period, so that the turbidity of the outlet water is substantially constant.
Comparative example 2 (without using a pH meter and allowing the pH to decrease for the second period of time)
Compared to example 2, the apparatus was the same except that no inlet line pH meter was used.
Similar to example 2, two consecutive periods of operation were carried out, wherein the feed water pH for the second period (3 hr) was made acidic (5.3).
Table 2b below shows the coagulant (PAC) dosing amount versus the effluent quality in case the influent pH for the second period of time becomes acidic (5.3).
TABLE 2b
| Parameter(s) | Unit of | A first period of time | For a second period of time | |
| pH of feed waterValue of | 8.8 | 5.3 | ||
| Inflow rate of water | m 3 / |
500 | 500 | |
| Turbidity of inlet water | NTU | 1500 | 1500 | |
| Influent sludge concentration | mg/L | 3996 | 3995 | |
| PAC dosage | ppm | 105 | 105 | |
| | ppm | 15 | 15 | |
| Turbidity of the effluent | NTU | 2.5 | 13.7 |
From table 2b, it can be seen that, when the pH value of the influent water in the second period of time is reduced to 5.3 and the quality conditions of other influent water are not changed, the PLC control system does not automatically sense the change, so that the previous coagulant dosage is maintained. This results in insufficient PAC addition, poor coagulation and thus an increase in effluent turbidity to 13.7, which is undesirable for discharge.
According to the comparison of above table 2a and 1b, can obviously see that, through increasing the use pH meter, the utility model discloses a medicine control system can in time increase the input volume of coagulant to ensure out water quality of water stability, thereby realize discharge to reach standard.
Example 3 (Using a pH meter and allowing the pH to rise for a second period of time)
The apparatus used was the same as in example 2.
Two successive periods (3 hr each) were carried out, wherein the feed water pH for the second period (3 hr) was made acidic (8.8) and the rest of the feed water conditions were essentially the same.
Table 3a below shows the coagulant (PAC) dosing amount versus the effluent quality in the case where the influent pH for the second period of time becomes alkaline (8.8).
TABLE 3a
| Parameter(s) | Unit | A first period of time | For a second period of time | |
| pH value of inlet water | 5.3 | 8.8 | ||
| Inflow rate of water | m 3 / |
500 | 500 | |
| Turbidity of inlet water | NTU | 1500 | 1500 | |
| Influent sludge concentration | mg/L | 3996 | 3995 | |
| PAC dosage | ppm | 120 | 105 | |
| | ppm | 15 | 15 | |
| Turbidity of the effluent | NTU | 2.5 | 2.6 |
As can be seen from Table 3a, when the pH of the influent water during the second period was 8.8 (weak alkaline range), the PAC dosage was reduced from that during the first period, and the turbidity of the effluent was substantially unchanged.
Comparative example 3 (without using a pH meter and allowing the pH of the second period to rise)
Compared to example 3, the apparatus was identical except that no inlet line pH meter was used.
Similar to example 3, a two-stage continuous operation was carried out in which the feed water pH for the second stage (3 hr) was made acidic (8.8).
Table 3b below shows the amount of coagulant (PAC) dosing compared to the effluent quality where the influent pH became basic (8.8) for the second period of time.
TABLE 3b
| Parameter(s) | Unit of | A first period of time | For a second period of time | |
| pH value of inlet water | 5.3 | 8.8 | ||
| Inflow rate of water | m 3 / |
500 | 500 | |
| Turbidity of inlet water | NTU | 1500 | 1500 | |
| Influent sludge concentration | mg/L | 3996 | 3995 | |
| PAC dosage | ppm | 120 | 120 | |
| | ppm | 15 | 15 | |
| Turbidity of the effluent | NTU | 2.5 | 1.8 |
From table 3b, it can be seen that, when the pH value of the influent water in the second period of time is raised to 8.8 and the quality conditions of other influent water are not changed, the PLC control system does not automatically sense the change, so that the previous coagulant dosing amount is maintained, and the turbidity of the effluent of the system is lower. Although the effluent quality is better in the second time period, the excessive addition of PAC causes medicament waste.
According to the comparison of above table 3a and 3b, can obviously see that, through increasing the use pH meter, the utility model discloses a medicine control system can in time reduce the input volume of coagulant with reduce cost to ensure that play water quality of water is stable in order to realize discharge to reach standard.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (6)
1. A medicine adding control system for mine water treatment is characterized by comprising:
a homogenizing and adjusting tank (100),
a coagulation reaction tank (200),
a flocculation reaction tank (300),
a coagulant medicine box (400),
flocculant medical box (500)
A sedimentation tank (600) is arranged in the sewage treatment tank,
a PLC control system (700), and
a human-machine interface (800) for a human-machine interface,
wherein a sludge concentration meter (101), a static pressure type liquid level meter (102) and a lift pump (103) are arranged in the homogenizing adjusting tank (100),
the outlet of the lift pump (103) is connected with the coagulation reaction tank (200) through a pipeline, the pipeline is provided with a pH meter (11) and a first flowmeter (12),
wherein a coagulation mixer (201) is arranged in the coagulation reaction tank (200), the coagulation reaction tank (200) is connected with the bottom of the flocculation reaction tank (300) through a bottom opening,
wherein the bottom of the coagulant medicine chest (400) is connected with the inlet of a coagulant medicine feeding pump (13) through a pipeline, the outlet of the coagulant medicine feeding pump (13) is connected with the coagulation reaction tank (200) through a pipeline, the pipeline is provided with a second flowmeter (14),
wherein a flocculation stirrer (301) is arranged in the flocculation reaction tank (300), the top outlet of the flocculation reaction tank (300) is connected with the sedimentation tank (600) through a pipeline,
wherein the bottom of the flocculant medicine box (500) is connected with the inlet of a flocculant dosing pump (15) through a pipeline, the outlet of the flocculant dosing pump (15) is connected with the flocculation reaction tank (300) through a pipeline,
wherein the top outlet of the sedimentation tank (600) is connected with an external drainage pipeline, the external drainage pipeline is provided with a turbidimeter (16), a qualified water discharge valve (17) and an unqualified water discharge valve (18),
the bottom of the sedimentation tank (600) is connected with a sludge pump (19) through a pipeline;
wherein the PLC control system (700) is connected with the sludge concentration meter (101), the static pressure type liquid level meter (102), the pH meter (11), the first flow meter (12), the second flow meter (14) and the turbidity meter (16) through cables, is used for collecting the measurement data of the sensors in real time, and
the PLC control system (700) is also connected with the lifting pump (103), the coagulation mixer (201), the coagulant dosing pump (13), the flocculation mixer (301), the flocculant dosing pump (15), the qualified water discharge valve (17), the unqualified water discharge valve (18) and the sludge discharge pump (19) through cables, and is used for controlling the on and off of the devices; and
wherein the human-machine interface (800) is connected with the PLC control system (700) through a cable.
2. The dosing control system according to claim 1, wherein the sludge concentration meter (101) is a range adaptive sludge concentration meter that measures a sludge concentration in the range of 0 to 20g/L.
3. The dosing control system according to claim 1, wherein the coagulant dosing pump (13) is a plastic-lined or stainless steel centrifugal pump capable of variable frequency operation,
the motor in the centrifugal pump is a variable frequency motor.
4. The dosing control system according to claim 1, wherein the first flow meter (12) and the second flow meter (14) are electromagnetic flow meters.
5. The dosing control system according to claim 1, wherein the qualified water drain valve (17) and the unqualified water drain valve (18) are electrically actuated valves.
6. The dosing control system of claim 1, wherein the human-machine interface (800) comprises a liquid crystal display, a touch mouse, and a keyboard.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320024041.9U CN218841805U (en) | 2023-01-03 | 2023-01-03 | Chemical adding control system for mine water treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320024041.9U CN218841805U (en) | 2023-01-03 | 2023-01-03 | Chemical adding control system for mine water treatment |
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| CN218841805U true CN218841805U (en) | 2023-04-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116256979A (en) * | 2023-05-15 | 2023-06-13 | 天津智云水务科技有限公司 | Water plant medicine adding system with online simulation experiment function and control method thereof |
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- 2023-01-03 CN CN202320024041.9U patent/CN218841805U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116256979A (en) * | 2023-05-15 | 2023-06-13 | 天津智云水务科技有限公司 | Water plant medicine adding system with online simulation experiment function and control method thereof |
| CN116256979B (en) * | 2023-05-15 | 2023-09-12 | 天津智云水务科技有限公司 | Water plant medicine adding system with online simulation experiment function and control method thereof |
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