CN112551675A - Wastewater treatment apparatus and control method thereof - Google Patents
Wastewater treatment apparatus and control method thereof Download PDFInfo
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- CN112551675A CN112551675A CN202011531923.1A CN202011531923A CN112551675A CN 112551675 A CN112551675 A CN 112551675A CN 202011531923 A CN202011531923 A CN 202011531923A CN 112551675 A CN112551675 A CN 112551675A
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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Abstract
The invention relates to the technical field of desulfurization wastewater pretreatment, and discloses a wastewater treatment device which comprises a configuration system, a storage system, a first conveying system, a neutralization system, a second conveying system and a control system, wherein the control system is electrically connected with a first liquid level meter, a conveying pump, a dosing pump and a PH detector; also disclosed is a method for controlling the above wastewater treatment system, comprising the steps of: acquiring a pH value in a neutralization tank, comparing the pH value with a preset pH value, and controlling the frequency of a chemical feeding pump according to the comparison result of the pH value so as to control the lime emulsion amount fed into the neutralization tank by a chemical storage tank; and acquiring liquid level information of the medicine storage box, and controlling the opening and closing of the delivery pump according to the liquid level information. The device and the control method have simple structure and easy operation, improve the lime emulsion configuration precision and the pH value adjustment precision of the neutralization tank, reduce the labor intensity of personnel, and simultaneously improve the safe and stable operation of the desulfurization wastewater pretreatment system.
Description
Technical Field
The invention relates to the technical field of desulfurization wastewater pretreatment, in particular to a wastewater treatment device and a control method thereof.
Background
At present, in a desulfurization wastewater pretreatment system of a power plant, lime emulsion is widely adopted to neutralize desulfurization wastewater to adjust the pH value of the wastewater, so that most heavy metal ions in the wastewater form insoluble hydroxides, and then solid-liquid separation is carried out to remove heavy metals in the wastewater. According to the technology, lime dry powder in a lime dry powder bin is conveyed into a lime emulsion preparation box and mixed with water to prepare lime emulsion with a certain concentration, then the prepared lime emulsion is transferred and stored to a lime emulsion storage box, and then the lime emulsion is added into a neutralization pond of a desulfurization wastewater pretreatment system through a dosing pump of the lime emulsion storage box to adjust the pH value of desulfurization wastewater, so that the effect of removing heavy metals in the desulfurization wastewater is achieved.
The prior art for neutralizing and adjusting the pH value of the wastewater by using lime emulsion has the following defects:
1. the water inflow is controlled by adjusting a dispensing water inlet valve in the lime emulsion preparation process, the preparation concentration of the lime emulsion is controlled, the preparation concentration of the lime emulsion can be directly influenced by the variation of dispensing water inlet pressure in the operation process, the fluctuation of the preparation concentration of the lime emulsion is large, and the lime emulsion only enters lime dry powder in the lime emulsion preparation process due to pipe explosion of a dispensing water inlet pipe under special conditions, so that the lime at the bottom of a lime emulsion preparation box is accumulated in a large amount and hardened due to no water, and the lime emulsion preparation box needs to be cleaned by a large amount of manpower, so that the normal operation of a system is influenced;
2. when the liquid level of a lime emulsion medicine box is low, a lime emulsion conveying pump needs to be manually started to transfer and store lime emulsion prepared in the lime emulsion preparation box into the medicine box, and the pH adjusting value of neutralization pond wastewater is suddenly reduced in the operation process;
3. when the desulfurization wastewater neutralization tank operates, lime emulsion is required to be added to adjust the pH value of the wastewater to be within the range of 9-9.5, the amount of the lime emulsion is adjusted by adjusting the operating frequency of a lime emulsion dosing pump during operation, and the pH adjusting value of the neutralization tank is greatly changed due to the fact that the lime emulsion dosing amount is not adjusted timely, so that the effect of removing heavy metals in wastewater treatment is influenced.
Disclosure of Invention
The purpose of the invention is: overcomes the defects of the prior art, and provides a device which has simple structure and easy operation and can realize automatic wastewater treatment and a control method thereof.
In order to achieve the above object, the present invention provides a wastewater treatment apparatus comprising:
the configuration system comprises a configuration box and a first stirrer arranged in the configuration box;
the storage system comprises a medicine storage box, a second stirrer and a first liquid level meter, wherein the second stirrer and the first liquid level meter are arranged in the medicine storage box, and the first liquid level meter is used for detecting the high and low liquid levels of the medicine storage box;
the first conveying system comprises a first conveying pipe for connecting the configuration box and the medicine storage box, and a conveying pump is arranged on the first conveying pipe;
the neutralization system comprises a neutralization tank, a third stirrer and a pH detector, wherein the third stirrer and the pH detector are arranged in the neutralization tank;
the second conveying system comprises a second conveying pipe connected with the medicine storage box and the neutralization tank, and a medicine feeding pump is arranged on the second conveying pipe; and
and the control system is electrically connected with the first liquid level meter, the delivery pump, the dosing pump and the PH detector, is used for controlling the frequency of the dosing pump according to the PH value detected by the PH detector, further controlling the lime emulsion amount dosed to the neutralization tank by the medicine storage box, and is used for controlling the opening and closing of the delivery pump according to the liquid level information detected by the first liquid level meter, further controlling the configuration box to start or stop delivering the lime emulsion to the medicine storage box.
As a preferred scheme, the configuration system further comprises a storage bin, a conveyor, a water inlet pipe, a switch, a flowmeter and a second liquid level meter, wherein the configuration box is provided with a water inlet and a feed inlet, the water inlet pipe is connected with the water inlet, the switch and the flowmeter are arranged on the water inlet pipe, and the feed inlet is connected with the storage bin through the conveyor; the second liquid level meter is used for detecting the high and low liquid levels of the configuration box;
the control system is electrically connected with the conveyor, the switch, the flowmeter and the second liquid level meter, and is used for controlling the on and off of the switch and the conveyor according to the liquid level information of the second liquid level meter, and controlling the frequency of the conveyor according to the water flow information of the flowmeter, so as to control the conveying amount of the lime dry powder.
Preferably, the first transport system further includes a first outlet valve, a second outlet valve, and a first check valve, the first outlet valve is provided on the first transport pipe and located on a side of the transport pump close to the distribution box, the second outlet valve and the first check valve are provided on the first transport pipe and located on a side of the transport pump close to the medicine storage box, and the second outlet valve is provided between the transport pump and the first check valve.
Preferably, the second conveying system further comprises a third outlet valve, and the third outlet valve is arranged on the second conveying pipe and is located on one side, close to the medicine storage box, of the medicine feeding pump.
Preferably, the second delivery system further comprises a fourth outlet valve and a second check valve, the fourth outlet valve and the second check valve are arranged on the second delivery pipe and located on one side of the dosing pump close to the neutralization tank, and the fourth outlet valve is arranged between the dosing pump and the second check valve.
Preferably, two ends of the first conveying pipe are respectively connected to the bottom of the configuration box and the bottom of the medicine storage box;
the top in neutralization pond is equipped with the inlet, the one end of second conveyer pipe is connected to the bottom of explosive box, the other end of second conveyer pipe is connected to the inlet.
A method for controlling the above-described wastewater treatment system, the method comprising the steps of:
acquiring a pH value in a neutralization tank, comparing the pH value with a preset pH value, and controlling the frequency of a chemical feeding pump according to the comparison result of the pH value so as to control the lime emulsion amount fed into the neutralization tank by a chemical storage tank;
acquiring liquid level information of the medicine storage box, and controlling the opening or closing of the delivery pump according to the liquid level information:
when the liquid level of the medicine storage box is equal to or lower than a first low liquid level preset value, controlling a delivery pump to be started so as to control a configuration box to deliver lime emulsion to the medicine storage box,
and when the liquid level of the medicine storage box is equal to or higher than a first high liquid level preset value, controlling the conveying pump to be closed so as to control the configuration box to stop conveying the lime emulsion to the medicine storage box.
Preferably, the method further comprises the following steps:
acquiring liquid level information of a configuration box;
when the liquid level of the configuration box is equal to or lower than a second low liquid level preset value, controlling the opening and closing of a conveyor for conveying the lime dry powder and a water inlet pipe to be opened so as to convey the lime dry powder and water to the configuration box;
and when the liquid level of the configuration box is equal to or higher than a second high liquid level preset value, controlling the conveyor and the switch to be closed so as to stop conveying the dry lime powder and the water to the configuration box.
Preferably, the method further comprises the following steps:
acquiring water flow information of the water inlet pipe;
when the water flow information is higher than a preset water flow value, the frequency of the conveyor is increased, and the adding amount of the dry lime powder is increased;
when the water flow information is lower than a water flow preset value, reducing the frequency of the conveyor to reduce the adding amount of the lime dry powder;
and when the water flow information is zero, closing the conveyor.
Preferably, the step of controlling the frequency of the chemical feeding pump according to the result of the PH comparison and further controlling the amount of lime milk fed from the chemical storage tank to the neutralization tank specifically comprises:
when the difference value between the PH value and the preset PH value is a first difference value, adjusting the frequency of the dosing pump to be a first frequency value;
when the difference value between the PH value and the preset PH value is a second difference value, adjusting the frequency of the dosing pump to be a second frequency value;
when the difference value between the PH value and the preset PH value is a third difference value, adjusting the frequency of the dosing pump to be a third frequency value;
when the PH value is higher than the preset PH value, stopping the dosing pump;
wherein the first difference is 3.5-6, the first frequency value is 30-50 Hz, the second difference is 1.5-3.4, the second frequency value is 11-29 Hz, the third difference is 0-1.4, and the third frequency value is 5-10 Hz.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
1. according to the wastewater treatment device, the control system is electrically connected with the first liquid level meter, the delivery pump, the dosing pump and the PH detector, and the delivery pump and the dosing pump are controlled to be opened and closed according to the liquid level information and the PH value, so that lime emulsion is delivered from the preparation box to the medicine storage box and is delivered from the medicine storage box to the neutralization pond, the neutralization treatment of wastewater is realized, the automation of the whole process is realized through the control system, the manual operation is not needed, and the wastewater treatment effect is improved.
2. According to the control method, the PH value of the neutralization tank is obtained through the control system and is compared with the preset value, the frequency of the chemical feeding pump is controlled according to the comparison result, the feeding amount of the lime emulsion is controlled, the liquid level information of the chemical storage box is obtained, the opening and closing of the conveying pump are controlled according to the liquid level information, the lime emulsion in the preparation box is conveyed to the chemical storage box, the PH value of the waste water in the neutralization tank can be accurately controlled, the lime emulsion amount of the chemical storage box is kept, and the storage amount of the lime emulsion does not need to be manually detected.
Drawings
FIG. 1 is a schematic view showing the overall construction of a wastewater treatment apparatus according to the present invention;
FIG. 2 is a flow chart illustrating a neutralization system control method of the present invention;
FIG. 3 is a flow chart illustrating a method for controlling a storage system according to the present invention;
FIG. 4 is a flow chart illustrating a control method of the configuration system of the present invention;
fig. 5 is a flow chart illustrating a conveyor control method according to the present invention.
In the figure:
1. a first stirrer; 2. a configuration box; 3. a second level gauge; 4. a medicine storage box; 5. a second agitator; 6. a first liquid level meter; 7. a first outlet valve; 8. a first delivery pipe; 9. a delivery pump; 10. a second outlet valve; 11. a first check valve; 12. a third outlet valve; 13. a dosing pump; 14. a fourth outlet valve; 15. a second check valve; 16. a second delivery pipe; 17. a neutralization pond; 18. a third stirrer; 19. a pH detector; 20. a storage bin; 21. a conveyor; 22. a flow meter; 23. a switch; 24. and (4) a water inlet pipe.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "first", "second", "third", and "fourth" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance, and therefore should not be construed as limiting the present invention.
As shown in fig. 1, a wastewater treatment apparatus of the present invention comprises: the system comprises a configuration system, a storage system, a first conveying system, a neutralization system, a second conveying system and a control system.
The configuration system comprises a configuration box 2 and a first stirrer 1 arranged inside the configuration box 2; the preparation box 2 is used for preparing lime emulsion, and the first stirrer 1 is used for fully mixing lime dry powder and water.
The storage system comprises a medicine storage box 4, a second stirrer 5 and a first liquid level meter 6, wherein the second stirrer 5 and the first liquid level meter 6 are arranged in the medicine storage box 4, and the first liquid level meter 6 is used for detecting the high liquid level and the low liquid level of the medicine storage box 4; the medicine tank 4 stores the lime emulsion transferred from the preparation tank 2, and the second agitator 5 prevents solid-liquid separation of the lime emulsion. Preferably, the first level gauge 6 is an ultrasonic level gauge.
The first conveying system comprises a first conveying pipe 8 for connecting the configuration box 2 and the medicine storage box 4, and a conveying pump 9 is arranged on the first conveying pipe 8; when lime emulsion needs to be conveyed to the medicine storage box 4, the conveying pump 9 is started until the liquid level of the medicine storage box 4 reaches a set value, and the conveying pump 9 is closed.
The neutralization system comprises a neutralization tank 17, a third stirrer 18 and a pH detector 19, wherein the third stirrer 18 and the pH detector are arranged inside the neutralization tank 17; the neutralization tank 17 is filled with wastewater, a pH detector 19 can detect the pH value of the wastewater, and a third stirrer 18 is used for fully mixing the lime emulsion and the wastewater to achieve the purpose of neutralizing the wastewater.
The second conveying system comprises a second conveying pipe 16 connected with the medicine storage box 4 and the neutralization pond 17, and a medicine feeding pump 13 is arranged on the second conveying pipe 16; when the PH value of the wastewater in the neutralization tank 17 is lower than a set value, the dosing pump 13 is started, lime emulsion in the medicine storage tank 4 is added into the neutralization tank 17, and the dosing pump 13 is closed until the PH value of the wastewater meets the requirement.
The control system is preferably a PCL control system, and the control system is electrically connected to the first liquid level meter 6, the delivery pump 9, the dosing pump 13 and the PH detector 19, and is configured to control the frequency of the dosing pump 13 according to the PH value detected by the PH detector 19, further control the amount of lime emulsion fed to the neutralization tank 17 by the medicine storage tank 4, control the opening and closing of the delivery pump 9 according to liquid level information detected by the first liquid level meter 6, and further control the configuration tank 2 to start or stop the delivery of lime emulsion to the medicine storage tank 4.
Based on the technical characteristics, the control system is electrically connected with the first liquid level meter 6, the delivery pump 9, the dosing pump 13 and the PH detector 19, and the delivery pump 9 and the dosing pump 13 are controlled to be opened and closed according to liquid level information and a PH value, so that lime emulsion is delivered to the medicine storage box 4 from the preparation box 2, and is delivered to the neutralization pond 17 from the medicine storage box 4, the neutralization treatment of wastewater is realized, manual operation is not needed, and the effect of wastewater treatment is improved.
Further, the configuration system further comprises a storage bin 20, a conveyor 21, a water inlet pipe 24, a switch 23, a flowmeter 22 and a second liquid level meter 3, the configuration box 2 is provided with a water inlet and a feed inlet, the water inlet pipe 24 is connected with the water inlet, the switch 23 and the flowmeter 22 are arranged on the water inlet pipe 24, and the feed inlet is connected with the storage bin 20 through the conveyor 21; the second liquid level meter 3 is used for detecting the high and low liquid levels of the configuration box 2; the control system is electrically connected with the conveyor 21, the switch 23, the flow meter 22 and the second liquid level meter 3, and is used for controlling the on and off of the switch 23 and the conveyor 21 according to the liquid level information of the second liquid level meter 3, and controlling the frequency of the conveyor 21 according to the water flow information of the flow meter 22, thereby controlling the conveying amount of the lime dry powder. When the second liquid level meter 3 detects that the liquid level of the configuration box 2 is at a set low level value, the conveyor 21 and the switch 23 are started, and according to the set concentration, lime dry powder and water are added into the configuration box 2 to configure lime emulsion, and the conveyor 21 and the switch 23 are stopped until the liquid level reaches a set high value; the flow meter 22 is used for monitoring water flow information, controlling the adding amount of the dry lime powder according to the water flow information, monitoring the water inlet condition according to the water flow information, preventing water from being cut off or a water pipe from bursting, and adding a large amount of the dry lime powder into the configuration box 2 under the condition of no water inlet. Preferably, the second level gauge 3 is an ultrasonic level gauge.
Further, the first delivery system further comprises a first outlet valve 7, a second outlet valve 10 and a first check valve 11, wherein the first outlet valve 7 is arranged on the first delivery pipe 8 and is positioned on one side of the delivery pump 9 close to the configuration box 2. The first outlet valve 7 is used for regulating the flow and isolating the delivery pump 9 from the configuration system during start-up and shutdown maintenance; the second outlet valve 10 and the first check valve 11 are provided on the first transport pipe 8 on the side of the transport pump 9 close to the medicine boxes 4, and the second outlet valve 10 is provided between the transport pump 9 and the first check valve 11. The second outlet valve 10 is used for regulating the flow and isolating the delivery pump 9 from the storage system during start-up and shutdown maintenance; the first check valve 11 serves to prevent the lime emulsion of the medicine box 4 from flowing backward.
Further, the second conveying system further comprises a third outlet valve 12, and the third outlet valve 12 is arranged on the second conveying pipe 16 and is positioned on one side of the dosing pump 13 close to the medicine storage box 4. The third outlet valve 12 is used to regulate flow and isolate the dosing pump 13 from the storage system during start-up and shut-down maintenance.
Further, the second delivery system further comprises a fourth outlet valve 14 and a second check valve 15, the fourth outlet valve 14 and the second check valve 15 are disposed on the second delivery pipe 16 and located on a side of the dosing pump 13 close to the neutralization tank 17, and the fourth outlet valve 14 is disposed between the dosing pump 13 and the second check valve 15. The fourth outlet valve 14 is used for regulating the flow and isolating the dosing pump 13 from the neutralization system during start-up and shutdown maintenance; the second check valve 15 serves to prevent the lime emulsion of the second transfer pipe 16 from flowing backward.
Further, two ends of the first conveying pipe 8 are respectively connected to the bottom of the configuration box 2 and the bottom of the medicine storage box 4; a liquid inlet is formed in the top of the neutralization pond 17, one end of the second conveying pipe 16 is connected to the bottom of the medicine storage box 4, and the other end of the second conveying pipe 16 is connected to the liquid inlet. The first transport pipe 8 and the second transport pipe 16 are provided at the bottom of the arrangement tank 2 and the medicine storage tank 4, which contributes to the entire transport of the lime milk, and the transport resistance of the transport pump 9 and the dosing pump 13 can be reduced by the self weight of the lime milk, thereby prolonging the service life of the transport pump 9 and the dosing pump 13.
A method of the present invention for controlling the above-described wastewater treatment system, the method comprising the steps of:
acquiring a pH value in a neutralization tank, comparing the pH value with a preset pH value, and controlling the frequency of a chemical feeding pump according to the comparison result of the pH value so as to control the lime emulsion amount fed into the neutralization tank by a chemical storage tank;
acquiring liquid level information of the medicine storage box, and controlling the opening or closing of the delivery pump according to the liquid level information:
when the liquid level of the medicine storage box is equal to or lower than a first low liquid level preset value, controlling a delivery pump to be started so as to control a configuration box to deliver lime emulsion to the medicine storage box,
and when the liquid level of the medicine storage box is equal to or higher than a first high liquid level preset value, the conveying pump is controlled to be closed so as to control the configuration box to stop conveying the lime emulsion to the medicine storage box.
Based on the technical characteristics, the PH value of the neutralization pond is obtained through the control system and is compared with a preset value, the frequency of the chemical feeding pump is controlled according to the comparison result, the feeding amount of the lime emulsion is controlled, the liquid level information of the chemical storage box is obtained, the conveying pump is controlled to be opened and closed according to the liquid level information, the lime emulsion of the configuration box is conveyed to the chemical storage box, the PH value of the waste water in the neutralization pond can be accurately controlled, the lime emulsion amount of the chemical storage box is kept, and the storage amount of the lime emulsion is not required to be manually detected.
To further illustrate the embodiments of the present invention, the following description specifically explains the embodiments of the present invention with reference to the drawings.
As shown in fig. 2, the flow chart of the neutralization system control method of the present invention includes:
s101, acquiring a PH value in a neutralization tank;
s102, comparing the PH value with a preset PH value;
s103, controlling the frequency of a chemical feeding pump according to the comparison result of the PH value, and further controlling the lime emulsion amount fed into the neutralization tank by the chemical storage tank.
Specifically, when the difference value between the PH value and the preset PH value is a first difference value, the frequency of the dosing pump is adjusted to be a first frequency value; when the difference value between the PH value and the preset PH value is a second difference value, adjusting the frequency of the dosing pump to be a second frequency value; when the difference value between the PH value and the preset PH value is a third difference value, adjusting the frequency of the dosing pump to be a third frequency value; when the PH value is higher than the preset PH value, stopping the dosing pump; wherein the first difference is 3.5-6, the first frequency value is 30-50 Hz, the second difference is 1.5-3.4, the second frequency value is 11-29 Hz, the third difference is 0-1.4, and the third frequency value is 5-10 Hz.
According to the embodiment of the invention, the frequency of the dosing pump is set according to the difference value between the pH value of the wastewater and the preset pH value, so that lime emulsion with different amounts is added for neutralization, and the pH value of the wastewater can be more accurately controlled.
As shown in fig. 3, a flow chart of the storage system control method of the present invention includes:
s201, acquiring liquid level information of a medicine storage box;
s202, when the liquid level of the medicine storage box is equal to or lower than a first low liquid level preset value, controlling a conveying pump to be started so as to control a configuration box to convey lime emulsion to the medicine storage box;
s203, when the liquid level of the medicine storage box is equal to or higher than a first high liquid level preset value, the conveying pump is controlled to be closed, and the configuration box is controlled to stop conveying lime emulsion to the medicine storage box.
The embodiment of the invention is provided with the first liquid level meter, and the delivery pump is controlled to be opened and closed according to the liquid level signal of the first liquid level meter, so that the corresponding lime emulsion can be ensured to be kept in the medicine storage box at any time without manual monitoring.
As shown in fig. 4, a flow diagram of a configuration system control method of the present invention includes:
s301, acquiring liquid level information of a configuration box;
s302, when the liquid level of the configuration box is equal to or lower than a second low liquid level preset value, controlling switches of a conveyor for conveying the lime dry powder and a water inlet pipe to be opened so as to convey the lime dry powder and water to the configuration box;
and S303, when the liquid level of the configuration box is equal to or higher than a second high liquid level preset value, controlling the conveyor and the switch to be closed so as to stop conveying the dry lime powder and the water to the configuration box.
According to the embodiment of the invention, the second liquid level meter is used for judging the stock of the prepared lime emulsion, controlling the opening and closing of the conveyor and the switch and timely preparing the lime emulsion.
As shown in fig. 5, a flow chart of the conveyor control method of the present invention includes:
s401, acquiring water flow information of the water inlet pipe;
s402, when the water flow information is higher than a water flow preset value, increasing the frequency of the conveyor and increasing the adding amount of the dry lime powder;
s403, when the water flow information is lower than a water flow preset value, reducing the frequency of the conveyor to reduce the adding amount of the lime dry powder;
and S404, when the water flow information is zero, closing the conveyor.
According to the embodiment of the invention, the adding amount of the lime dry powder is controlled through the water flow information of the water inlet pipe, the lime emulsion with the set concentration is configured, and the problem that the lime dry powder is added into the configuration box in a large amount due to no water inlet of the water inlet pipe when water is cut off or a water pipe is exploded, so that the configuration box is difficult to clean due to the fact that too much lime dry powder is accumulated in the configuration box.
In summary, the embodiment of the invention provides a wastewater treatment device and a control method, which have the advantages of simple structure and easy operation, improve the lime emulsion preparation precision and the pH value adjustment precision of a neutralization tank, reduce the labor intensity of personnel, and greatly improve the safe and stable operation of a desulfurization wastewater pretreatment system.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. An apparatus for treating wastewater, comprising:
the configuration system comprises a configuration box and a first stirrer arranged in the configuration box;
the storage system comprises a medicine storage box, a second stirrer and a first liquid level meter, wherein the second stirrer and the first liquid level meter are arranged in the medicine storage box, and the first liquid level meter is used for detecting the high and low liquid levels of the medicine storage box;
the first conveying system comprises a first conveying pipe for connecting the configuration box and the medicine storage box, and a conveying pump is arranged on the first conveying pipe;
the neutralization system comprises a neutralization tank, a third stirrer and a pH detector, wherein the third stirrer and the pH detector are arranged in the neutralization tank;
the second conveying system comprises a second conveying pipe connected with the medicine storage box and the neutralization tank, and a medicine feeding pump is arranged on the second conveying pipe; and
and the control system is electrically connected with the first liquid level meter, the delivery pump, the dosing pump and the PH detector, is used for controlling the frequency of the dosing pump according to the PH value detected by the PH detector, further controlling the lime emulsion amount dosed to the neutralization tank by the medicine storage box, and is used for controlling the opening and closing of the delivery pump according to the liquid level information detected by the first liquid level meter, further controlling the configuration box to start or stop delivering the lime emulsion to the medicine storage box.
2. The wastewater treatment device of claim 1, wherein the configuration system further comprises a storage bin, a conveyor, a water inlet pipe, a switch, a flowmeter and a second liquid level meter, the configuration box is provided with a water inlet and a feed inlet, the water inlet pipe is connected with the water inlet, the switch and the flowmeter are arranged on the water inlet pipe, and the feed inlet is connected with the storage bin through the conveyor; the second liquid level meter is used for detecting the high and low liquid levels of the configuration box;
the control system is electrically connected with the conveyor, the switch, the flowmeter and the second liquid level meter, and is used for controlling the on and off of the switch and the conveyor according to the liquid level information of the second liquid level meter, and controlling the frequency of the conveyor according to the water flow information of the flowmeter, so as to control the conveying amount of the lime dry powder.
3. The wastewater treatment apparatus according to claim 1 or 2, wherein the first transport system further comprises a first outlet valve provided on the first transport pipe on a side of the transport pump close to the distribution box, a second outlet valve and a first check valve provided on the first transport pipe on a side of the transport pump close to the drug storage box, the second outlet valve and the first check valve being provided between the transport pump and the first check valve.
4. The wastewater treatment apparatus according to claim 1 or 2, wherein the second transport system further comprises a third outlet valve provided in the second transport pipe on a side of the dosing pump adjacent to the drug storage box.
5. The wastewater treatment apparatus of claim 4, wherein the second delivery system further comprises a fourth outlet valve and a second check valve disposed on the second delivery line on a side of the dosing pump adjacent the neutralization basin, the fourth outlet valve disposed between the dosing pump and the second check valve.
6. The wastewater treatment apparatus according to claim 1 or 2, wherein both ends of the first transport pipe are connected to the bottom of the distribution tank and the bottom of the drug storage tank, respectively;
the top in neutralization pond is equipped with the inlet, the one end of second conveyer pipe is connected to the bottom of explosive box, the other end of second conveyer pipe is connected to the inlet.
7. A method for controlling the wastewater treatment system according to any of claims 1-6, characterized in that the method comprises the steps of:
acquiring a pH value in a neutralization tank, comparing the pH value with a preset pH value, and controlling the frequency of a chemical feeding pump according to the comparison result of the pH value so as to control the lime emulsion amount fed into the neutralization tank by a chemical storage tank;
acquiring liquid level information of the medicine storage box, and controlling the opening or closing of the delivery pump according to the liquid level information:
when the liquid level of the medicine storage box is equal to or lower than a first low liquid level preset value, controlling a delivery pump to be started so as to control a configuration box to deliver lime emulsion to the medicine storage box,
and when the liquid level of the medicine storage box is equal to or higher than a first high liquid level preset value, controlling the conveying pump to be closed so as to control the configuration box to stop conveying the lime emulsion to the medicine storage box.
8. The method of claim 7, further comprising the steps of:
acquiring liquid level information of a configuration box;
when the liquid level of the configuration box is equal to or lower than a second low liquid level preset value, controlling the opening and closing of a conveyor for conveying the lime dry powder and a water inlet pipe to be opened so as to convey the lime dry powder and water to the configuration box;
and when the liquid level of the configuration box is equal to or higher than a second high liquid level preset value, controlling the conveyor and the switch to be closed so as to stop conveying the dry lime powder and the water to the configuration box.
9. The method of claim 7, further comprising the steps of:
acquiring water flow information of the water inlet pipe;
when the water flow information is higher than a preset water flow value, the frequency of the conveyor is increased, and the adding amount of the dry lime powder is increased;
when the water flow information is lower than a water flow preset value, reducing the frequency of the conveyor to reduce the adding amount of the lime dry powder;
and when the water flow information is zero, closing the conveyor.
10. The method according to claim 7, wherein the step of controlling the frequency of the dosing pump according to the result of the pH value comparison and further controlling the amount of lime milk dosed into the neutralization tank by the medicine storage tank specifically comprises:
when the difference value between the PH value and the preset PH value is a first difference value, adjusting the frequency of the dosing pump to be a first frequency value;
when the difference value between the PH value and the preset PH value is a second difference value, adjusting the frequency of the dosing pump to be a second frequency value;
when the difference value between the PH value and the preset PH value is a third difference value, adjusting the frequency of the dosing pump to be a third frequency value;
when the PH value is higher than the preset PH value, stopping the dosing pump;
wherein the first difference is 3.5-6, the first frequency value is 30-50 Hz, the second difference is 1.5-3.4, the second frequency value is 11-29 Hz, the third difference is 0-1.4, and the third frequency value is 5-10 Hz.
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| CN114735798A (en) * | 2022-04-15 | 2022-07-12 | 洛阳瑞昌环境工程有限公司 | Discharge treatment system and discharge treatment process for high-temperature condensed acidic water |
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