Water treatment chemical addition intelligent equipment

Abstract

The invention discloses an intelligent device for adding water treatment drugs, and relates to the technical field of water treatment. The invention comprises a sedimentation flotation chamber, the upper end of the sedimentation flotation chamber is connected to a high-pressure clean water pipe, one side of the sedimentation flotation chamber is connected to a turbidity meter, one end of the turbidity meter is connected to a turbidity meter probe, the turbidity meter probe is located inside the sedimentation flotation chamber, the output end of the high-pressure clean water pipe is connected to a turbidity meter probe cleaning nozzle, the turbidity meter probe cleaning nozzle is adapted to the position of the turbidity meter probe, one side of the high-pressure clean water pipe is connected to a shunt pipe, the output end of the shunt pipe is connected to a pipe wall cleaning nozzle, and the bottom side surface of the sedimentation flotation chamber is connected to a connecting pipe; the invention accurately simulates the sedimentation flotation chamber and related supporting designs required for online detection of the working process of the water treatment equipment, and can quickly and effectively detect the effect of using coagulants and flocculants in water treatment, thereby automatically guiding the addition amount of coagulants and flocculants through program algorithms.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to intelligent equipment for adding water treatment chemicals. Background Art

[0002] Coagulants and flocculants are widely used in the water treatment process of industrial and domestic water to accelerate the separation of solid impurities suspended in water. Among them, coagulants use the countercharges (usually positive charges) they contain to neutralize the surface charges (usually negative charges) of suspended tiny particles, allowing these particles to overcome the strong repulsive forces between similar charges and condense into larger particles. The main function of flocculants is to use the long-chain structure of high-molecular organic matter to link the formed large solid particles into giant flocs, so that they can move downward or upward in one direction under the action of gravity or the buoyancy of bubbles, thereby achieving the purpose of quickly separating them from the water body. Flocculants used in combination with coagulants are often anionic (negatively charged), but there are also cases where cationic (positively charged) or non-ionic (uncharged) flocculants are used. Sometimes flocculants can also be used alone without coagulants;

[0003] There are already some devices that monitor water quality to adjust the amount of chemicals used. Known technologies include:

[0004] 1. Detect the turbidity of the water entering the water treatment equipment to adjust the dosage of chemicals. If the turbidity increases, the control equipment will increase the dosage of coagulant and flocculant in the same proportion according to the preset program.

[0005] vice versa;

[0006] However, due to the use of a single parameter, water turbidity, the program cannot separate the effects of the coagulant and flocculant, and therefore cannot adjust the two chemicals individually. In actual applications, the dosing ratio of the two chemicals is often a fixed value. When parameters such as the size of fine particles entering the water and the strength of the surface charge change, it is often necessary to independently adjust the dosage of the coagulant and flocculant according to the changes in water quality in order to achieve the best treatment effect with the least amount of medicine. Fixing the ratio of the two chemicals will lead to drug waste and poor water treatment effects. Secondly, the existing methods cannot reflect the actual water treatment effect, and often require another device to monitor the turbidity of the effluent. In addition, the determination of the existing methods is greatly affected by bubbles in the water and cannot be applied to the dosage control of flotation equipment at all. Finally, since the incoming water contains a lot of impurities, the equipment is prone to blockage of the water inlet pipe, and solid particles are deposited on the turbidity meter probe, resulting in large measurement deviations. Therefore, the effect is very poor in actual applications;

[0007] 2. Another common solution is to control the dosage by monitoring the effluent turbidity. If the effluent turbidity increases, the dosage of coagulant and flocculant is increased in the same proportion. Vice versa;

[0008] This solution has the same problem as the above solution, that is, using a single parameter such as turbidity cannot independently adjust the coagulant and flocculant according to the changes in the particle size or surface charge strength of the influent, resulting in drug waste and poor water treatment effect. In addition, due to the residence time in the water treatment equipment, this solution has a serious delay problem, especially in the sedimentation tank, where it often takes several hours from adjusting the dosage to seeing the effect. This may cause the treatment effect to deviate from the target for a long time and significantly.

[0009] Therefore, we propose intelligent equipment for adding water treatment chemicals. Summary of the invention

[0010] The present invention uses equipment to simulate the solid-liquid separation process of sedimentation and flotation, and predicts the clarification effect by observing the change of water turbidity over time, and realizes separate and precise control of the coagulant and flocculant according to the final turbidity and the change rate of the turbidity.

[0011] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0012] The present invention is an intelligent device for adding water treatment drugs, comprising a sedimentation flotation chamber, wherein the upper end of the sedimentation flotation chamber is connected to a high-pressure clean water pipe, one side of the sedimentation flotation chamber is connected to a turbidity meter, one end of the turbidity meter is connected to a turbidity meter probe, the turbidity meter probe is located inside the sedimentation flotation chamber, the output end of the high-pressure clean water pipe is connected to a turbidity meter probe cleaning nozzle, the turbidity meter probe cleaning nozzle is adapted to the position of the turbidity meter probe, one side of the high-pressure clean water pipe is connected to a shunt pipe, the output end of the shunt pipe is connected to a pipe wall cleaning nozzle, the side surface of the bottom end of the sedimentation flotation chamber is connected to a connecting pipe, one end of the connecting pipe is connected to a water sample inlet, one end of the water sample inlet is connected to the sedimentation flotation chamber, the bottom end of the sedimentation flotation chamber is connected to a water sample emptying port; one side of the water sample emptying port is connected to an electromagnetic valve; the pipe wall cleaning nozzle is adapted to the position of the sedimentation flotation chamber.

[0013] The intelligent device for adding water treatment drugs comprises a sedimentation flotation chamber and a water sample tank, wherein the upper end of the sedimentation flotation chamber is connected to a high-pressure clean water pipe, the output end of the high-pressure clean water pipe is connected to a pipe wall cleaning nozzle, one side of the high-pressure clean water pipe is connected to a shunt pipe, the output end of the shunt pipe is connected to a turbidity meter probe cleaning nozzle, one side of the sedimentation flotation chamber is connected to a turbidity meter, one end of the turbidity meter is connected to a turbidity meter probe, the turbidity meter probe is located inside the sedimentation flotation chamber, and the turbidity meter probe cleaning nozzle is connected to the turbidity meter probe. The nozzle is adapted to the position of the turbidity meter probe. The upper end of the sedimentation flotation chamber is also connected to a liquid level detector and a vacuum tube, respectively. The bottom end of the sedimentation flotation chamber is connected to a sampling and sampling hose. One end of the sampling and sampling hose is connected to a water sample tank. The bottom side surface of the water sample tank is connected to a water inlet, and the top side surface of the water sample tank is provided with an overflow tank; the bottom end of the water sample tank is connected to a drain valve; the detection end of the liquid level detector extends into the sedimentation flotation chamber, and the vacuum end of the vacuum tube extends into the sedimentation flotation chamber.

[0014] The present invention has the following beneficial effects:

[0015] The intelligent water treatment chemical addition device of the present invention distinguishes the effects of the coagulant and the flocculant, so that the addition amounts of the two can be controlled separately, thereby improving the solid-liquid separation effect and effectively reducing chemical waste.

[0016] The intelligent device for adding water treatment chemicals of the present invention intuitively, quickly and reliably predicts the performance of incoming water in the water treatment equipment by simulating the sedimentation process, so that the addition amount of coagulant and flocculant can be adjusted in time, providing stability of the water treatment effect.

[0017] The intelligent device for adding water treatment chemicals of the present invention focuses on the sedimentation process rather than the single-point turbidity reading. The design effectively avoids the interference of bubbles on the turbidity meter, making the test results more accurate and reliable.

[0018] The water treatment chemical adding intelligent device of the present invention is designed to minimize the deposition of particles on the turbidity meter probe and reduce the deviation of the measurement result.

[0019] In summary, the use of this equipment to monitor the effect of sedimentation or flotation water treatment and timely and independently adjust the amount of coagulant and flocculant added can ensure that the water treatment effect is always maintained at a high level. At the same time, the amount of chemicals is also kept at a low level. In addition, the reliability of this equipment and its tolerance to bubbles enable it to provide extremely reliable monitoring and control in harsh environments.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a sedimentation and flotation simulation structure designed for the positive pressure sampling method of the present invention;

[0023] Figure 2 Schematic diagram of the sedimentation and flotation simulation structure designed for the vacuum sampling method of the present invention.

[0024] In the figure: 1. Sedimentation flotation chamber; 2. High-pressure clean water pipe; 3. Overflow tank; 4. Pipe wall cleaning nozzle; 5. Turbidimeter; 6. Turbidimeter probe cleaning nozzle; 7. Connecting pipe; 8. Water sample inlet; 9. Water sample drain port; 10. Liquid level detector; 11. Vacuum tube; 12. Sampling and discharge hose; 13. Water sample tank; 14. Water inlet; 15. Drain valve; 16. Solenoid valve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1

[0027] See also Figure 1 As shown: the present invention is an intelligent device for adding water treatment drugs, including a sedimentation flotation chamber 1, a high-pressure clean water pipe 2 is connected to the upper end of the sedimentation flotation chamber 1, a turbidity meter 5 is connected to one side of the sedimentation flotation chamber 1, one end of the turbidity meter 5 is connected to a turbidity meter probe, the turbidity meter probe is located on the inner side of the sedimentation flotation chamber 1, the output end of the high-pressure clean water pipe 2 is connected to a turbidity meter probe cleaning nozzle 6, the turbidity meter probe cleaning nozzle 6 is adapted to the position of the turbidity meter probe, a shunt pipe is connected to one side of the high-pressure clean water pipe 2, the output end of the shunt pipe is connected to a pipe wall cleaning nozzle 4, the bottom side surface of the sedimentation flotation chamber 1 is connected to a connecting pipe 7, one end of the connecting pipe 7 is connected to a water sample inlet 8, one end of the water sample inlet 8 is connected to the sedimentation flotation chamber 1, and the bottom end of the sedimentation flotation chamber 1 is connected to a water sample discharge port 9.

[0028] A solenoid valve 16 is connected to one side of the water sample discharge port 9 , and the pipe wall cleaning nozzle 4 is adapted to the position of the sedimentation flotation chamber 1 .

[0029] This solution also includes a turbidity meter signal receiving controller, a programmable logic controller (PLC), and a human-machine interaction screen. The turbidity meter signal receiving controller is electrically connected to the turbidity meter 5, and the PLC is electrically connected to the solenoid valve 16 and the drain valve 15 respectively.

[0030] Sampling uses the pressure of the water inlet pipe to take water samples. The operation process is as follows:

[0031] S1: PLC opens the water sample inlet solenoid valve 16, allowing the incoming water sample to fill the sedimentation flotation chamber 1 and be discharged from the overflow tank 3;

[0032] S2: When the water sample reaches the same level as the water inlet pipe (depending on the length of the sampling pipe, generally 5-10 seconds), the solenoid valve of the water sample inlet 8 is closed, and the PLC starts to record the time and turbidity value changes. During the static period of the water sample, the solids in the water settle under gravity or float under the action of bubbles. The measured turbidity value decreases over time;

[0033] S3: If the turbidity does not reach the required flocculation turbidity target within the predetermined time (3-10 minutes), the PLC increases the amount of flocculant added according to the preset program. If the time to reach the target turbidity is shorter than the predetermined time, the PLC reduces the amount of flocculant added according to the preset program;

[0034] S4: The water sample continues to stand until the second preset time (5-10 minutes), and the turbidity meter 5 reads the final turbidity. The PLC compares the final turbidity with the coagulation target turbidity. If the final turbidity is higher than the coagulation target turbidity, the amount of coagulant is increased according to the preset program. If the final turbidity is lower than the coagulation target, the amount of coagulant added is reduced according to the program;

[0035] S5: After reading the final turbidity, the PLC opens the solenoid valve 16 of the water sample discharge port 9 to discharge the water sample;

[0036] S6: After the sedimentation flotation chamber 1 is emptied (3-5 seconds), the PLC opens the high-pressure clean water solenoid valve and cleans the pipe wall and the turbidity meter probe through the pipe wall cleaning nozzle 4;

[0037] S7: After cleaning is completed (5-10 seconds), the system can proceed to the next round of measurement.

[0038] Embodiment 2

[0039] See also Figure 2As shown: the intelligent device for adding water treatment drugs comprises a sedimentation flotation chamber 1 and a water sample tank 13, the upper end of the sedimentation flotation chamber 1 is connected with a high-pressure clean water pipe 2, the output end of the high-pressure clean water pipe 2 is connected with a pipe wall cleaning nozzle 4, one side of the high-pressure clean water pipe 2 is connected with a shunt pipe, the output end of the shunt pipe is connected with a turbidity meter probe cleaning nozzle 6, one side of the sedimentation flotation chamber 1 is connected with a turbidity meter 5, one end of the turbidity meter 5 is connected with a turbidity meter probe, the turbidity meter probe is located on the inner side of the sedimentation flotation chamber 1, the turbidity meter probe cleaning nozzle 6 is adapted to the position of the turbidity meter probe, the upper end of the sedimentation flotation chamber 1 is also respectively connected with a liquid level detector 10 and a vacuum tube 11, the bottom end of the sedimentation flotation chamber 1 is connected with a sampling and discharging hose 12, one end of the sampling and discharging hose 12 is connected with the water sample tank 13, the bottom end side surface of the water sample tank 13 is connected with a water inlet 14, and the top side surface of the water sample tank 13 is provided with an overflow tank 3.

[0040] The bottom end of the water sample tank 13 is connected to a drain valve 15 ; the detection end of the liquid level detector 10 extends into the sedimentation flotation chamber 1 , and the vacuum end of the vacuum tube 11 extends into the sedimentation flotation chamber 1 .

[0041] This solution also includes a turbidity meter signal receiving controller, a programmable logic controller (PLC), and a human-machine interaction screen. The turbidity meter signal receiving controller is electrically connected to the turbidity meter 5, and the PLC is electrically connected to the solenoid valve 16 and the drain valve 15 respectively.

[0042] According to the application scenario, water samples are collected by directly drawing water samples from the mixing area of ​​the sedimentation tank by vacuum suction, or by sucking water in the water sample tank 13. The operation process is as follows:

[0043] S1: If the water sample tank 13 is used, it is necessary to ensure that the water sample in the water inlet tank is consistent with the water sample in the water treatment equipment water inlet pipe. This requires that the water inlet is kept open and the water sample flow rate can ensure the uniformity of the sample.

[0044] S2: PLC opens the vacuum generator and the solenoid valve of the vacuum pipeline. Under the action of negative pressure, the water sample is sucked into the sedimentation flotation chamber 1. When the water level reaches the preset height, the liquid level detector 10 sends a signal to the PLC. The PLC closes the vacuum generator and the solenoid valve of the vacuum pipeline. The water sample is left to stand.

[0045] S3: PLC starts recording the change of turbidity over time. During the period when the water sample is still, the solids in the water settle under gravity or float up under the action of bubbles. The measured turbidity value decreases over time.

[0046] S4: If the turbidity does not reach the required flocculation turbidity target within the predetermined time (3-10 minutes), the PLC increases the amount of flocculant added according to the preset program. If the time to reach the target turbidity is shorter than the predetermined time, the PLC reduces the amount of flocculant added according to the preset program.

[0047] S5: The water sample continues to stand for the second preset time (5-10 minutes), and the turbidity meter 5 reads the final turbidity. The PLC compares the final turbidity with the coagulation target turbidity. If the final turbidity is higher than the coagulation target turbidity, the amount of coagulant is increased according to the preset program. If the final turbidity is lower than the coagulation target, the amount of coagulant added is reduced according to the program.

[0048] S6: After reading the final turbidity, the PLC opens the compressed air solenoid valve to drain the water sample. After draining (3-5 seconds), the compressed air solenoid valve is closed.

[0049] S7: PLC opens the high-pressure clean water solenoid valve and cleans the pipe wall and the turbidity meter probe through the pipe wall cleaning nozzle 4.

[0050] S8: After 3-5 seconds, the PLC closes the high-pressure clean water solenoid valve and opens the compressed air solenoid valve again (3-5 seconds) to ensure that the clean water in the sedimentation flotation chamber 1 and the sampling hose 12 is completely discharged.

[0051] S9: After 2 minutes, when the water samples in the water sample tank 13 and the water inlet pipe are consistent, the system can proceed to the next round of measurement.

[0052] Note: The vacuum can be generated using a Ventura vacuum generator driven by compressed air to reduce the volume and equipment cost.

[0053] This solution is used in water treatment to remove suspended particles in water by sedimentation or flotation using coagulants and flocculants or one of them. Common areas include domestic water treatment plants, clarification stages of domestic and industrial wastewater treatment plants, mineral flotation processes, and fiber recovery processes in paper mill flotation white water.

[0054] In this scheme, the sedimentation flotation chamber 1 is used to accurately simulate the working process of the water treatment equipment. It obtains the inlet water sample mixed with coagulant and flocculant from the water inlet pipe of the water treatment equipment, and allows it to stand in the sedimentation flotation chamber 1 for a period of time (generally 5-10 minutes). During this period, the solids in the water will settle to the bottom under the action of gravity, or rise to the top under the action of dissolved bubbles. A turbidity meter probe is installed in the middle of the sedimentation flotation chamber 1, which will continuously measure the turbidity of the water at the median height. The rate of decrease of turbidity with standing time can reflect the effect of the flocculant, and the final turbidity of the water sample at the median of long-standing standing reflects the effectiveness of the amount of coagulant added. The principle is as follows:

[0055] Coagulant: The main function of the coagulant is to neutralize the negative charge on the surface of fine particles, so that they can condense together to form larger particles. Accelerate their sedimentation or flotation speed in the water. Otherwise, the repulsive force of the same charge will cause the fine particles to be suspended in the water for a very long time (up to several days or even longer). If the coagulant is used in an appropriate amount, even without flocculants, large particles can settle or be brought to the surface of the water by bubbles in a relatively short time (generally less than 20-30 minutes).

[0056] The device determines the coagulation effect by measuring the turbidity at the median height of the water body that has been standing for a long enough time (usually 5-10 minutes) and comparing it with the preset value. The preset value is often determined by the water quality requirements of the water treatment equipment. If the turbidity is higher than the effluent water quality requirements, it means that the amount of coagulant is not enough, and there are still a large number of fine particles in the water body that cannot settle or float, so more coagulant needs to be added. If the turbidity is lower than the effluent requirements, it means that the coagulation effect is too good, and there is room to reduce the coagulant to save the coagulant cost.

[0057] Flocculant: The main function of the flocculant is to flocculate the large solid particles formed with the help of the coagulant into agglomerates, accelerating the sinking or flotation speed. If the amount of flocculant is appropriate, the flocs will be larger in size and higher in density, and the flocs will also have greater strength to resist bypassing, so they will be concentrated on the bottom of the water (sedimentation) or on the surface of the water (flotation) in a shorter time. If the amount is insufficient, the flocs will be small in size, low in density, and weak in strength, and it will take longer to complete sedimentation or floating. By monitoring the time for the water sample in the middle of the sedimentation flotation chamber 1 to reach an acceptable turbidity and comparing it with the time parameters required by the water treatment equipment, the appropriateness of the amount of flocculant can be evaluated. If the time for the middle of the water sample to reach the preset turbidity is longer than expected, it indicates that the flocculation effect is not good and the amount of flocculant needs to be increased. Conversely, if the time for the middle of the water sample to reach the preset turbidity is shorter than expected, it indicates that the flocculation effect is too good and there is room to reduce the amount of flocculant to achieve the purpose of cost saving.

[0058] The present invention uses equipment to simulate the solid-liquid separation process of sedimentation and flotation, and predicts the clarification effect by observing the change of water turbidity over time, and realizes separate and precise control of coagulants and flocculants according to the final turbidity and the rate of change of turbidity. The test sample is taken from the water sample that already contains all chemicals and is about to enter the sedimentation tank or flotation tank, so as to ensure the closest prediction of the actual situation of the system. Because the sampling point is very close to the dosing point, the adjustment of the dosing amount can be fed back to the test results in time, ensuring the minimum delay. In addition, the design of the sedimentation and flotation chamber ensures that the monitoring equipment will not be blocked by the water inlet pipe.

[0059] This solution is aimed at the existing technology that only measures the single parameter of influent or effluent turbidity, and cannot determine which specific drug addition amount needs to be adjusted. Therefore, it is often necessary to fix the addition ratio of the two drugs. This cannot adapt to the diversity of influent water quality changes. As a result, the control equipment cannot maintain the best treatment effect and the most reasonable drug addition amount.

[0060] The present invention uses a turbidity meter to observe the rate of change of turbidity of water samples and the final turbidity during sedimentation or flotation, effectively distinguishing the functions of coagulants and flocculants, and thus being able to accurately control the two drugs separately. This effectively ensures the adaptability of the equipment to diversified water inflow, greatly improving the effect of reducing the solid content in the water. And it reduces the waste of drugs. In addition, by simulating the sedimentation and flotation of the incoming water, this technology can quickly and accurately predict the separation of solids in the water in the water treatment equipment, so that the dosage can be reliably and timely adjusted individually, ensuring the stability of the solid-liquid separation effect.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for intelligent control of adding water treatment chemicals. It is characterized in that The following steps are involved: S1: PLC opens the solenoid valve of the water sample inlet (8), allowing the incoming water sample to fill the sedimentation flotation chamber (1). and discharged from the overflow tank (3); S2: When the water sample reaches the same level as the water inlet pipe, the water sample inlet solenoid valve (8) is closed, and the PLC starts to record the time and turbidity value changes; while the water sample is still, the solids in the water settle under gravity. Or it floats up due to the action of bubbles; the measured turbidity value decreases over time; S3: If the turbidity does not reach the required flocculation turbidity target within the preset time of 3-10 minutes, the PLC will increase the amount of flocculant added according to the preset program; if the time to reach the target turbidity is longer than the preset time, the PLC will increase the amount of flocculant added according to the preset program; If the time is short, the PLC will reduce the amount of flocculant added according to the preset program; S4: The water sample continues to stand for the second preset time of 5-10 minutes, and the turbidity meter (5) reads the final turbidity; the PLC compares the final turbidity with the coagulation target turbidity; if the final turbidity is higher than the coagulation target turbidity, the amount of coagulant is increased according to the preset program; if the final turbidity is lower than the coagulation target, Reduce the amount of accelerator added according to the procedure; S5: After reading the final turbidity, the PLC opens the solenoid valve (16) of the water sample drain port (9). Discharge water sample; S6: After the sedimentation air flotation chamber (1) is emptied, the PLC opens the high-pressure clean water solenoid valve to clean the water through the pipe wall. Wash the nozzle (4) to clean the tube wall and turbidity meter probe; S7: After cleaning is completed, the system can proceed to the next round of measurement.

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