An automatic control system and device for softening water quality

Abstract

The application relates to an automatic control system and device for softening water quality, which comprises a first detection module, a second detection module, a third detection module, a control module, a first dosing module, a second dosing module and a third dosing module; the control module is connected with the first detection module, the second detection module and the third detection module respectively, and the first dosing module, the second dosing module and the third dosing module are connected with the control module respectively and are used for adding lime, sodium hydroxide and sodium carbonate to water treatment equipment respectively. The alkalinity, calcium hardness and PH value of water are detected, so that the control module can adjust the current operation mode according to the data, adopt a more suitable hardness removal and alkalinity removal dosing scheme, and thus realize the hardness removal treatment and alkalinity removal treatment of various municipal water and industrial water in a switching operation mode of one set of system, and the cost of treating water can be reduced.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to an automatic control system and device for softening water. Background Technology

[0002] Currently, both municipal and industrial water use have high requirements for water quality. Water hardness and alkalinity are typically considered two important water quality indicators. For example, excessive hardness can cause numerous problems during water use and may even lead to nephritis in drinkers. Excessive alkalinity, on the other hand, is corrosive, increasing the maintenance costs of drainage systems. Therefore, it is essential to treat water to reduce hardness and alkalinity during the water usage process.

[0003] However, the proportions of various ions in municipal or industrial water to be treated vary, and the dosing schemes used to treat water containing different proportions of various ions are also different. Therefore, removing hardness and alkalinity from various types of municipal or industrial water requires high costs. Utility Model Content

[0004] In order to reduce the cost of removing hardness and alkalinity from various municipal and industrial waters, this application provides an automatic control system and device for softening water.

[0005] In a first aspect, this application provides an automatic control system for softening water, employing the following technical solution: An automatic control system for softening water includes a first detection module, a second detection module, a third detection module, a control module, a first dosing module, a second dosing module, and a third dosing module; The first detection module is used to detect the water body to be treated flowing into the water treatment equipment, detect the calcium hardness and alkalinity of the water body to be treated, and output a first detection signal representing the calcium hardness and alkalinity of the water body to be treated. The water treatment equipment includes a coagulation tank, a first reaction tank, a second reaction tank, a flocculation tank and a sedimentation tank connected in sequence. The second detection module is used to detect the pH value of the first water body after it has been treated by the first reaction tank, and output a second detection signal representing the pH value. The third detection module is used to detect the calcium hardness, magnesium hardness, and alkalinity of the second water body flowing out of the water treatment equipment, and output a third detection signal representing the calcium hardness, magnesium hardness, and alkalinity of the second water body. The control module is connected to the first detection module, the second detection module and the third detection module respectively, and is used to compare the calcium hardness and alkalinity of the water to be treated, output a mode operation signal corresponding to the comparison result, the mode operation signal indicates the reagent and the first dosage corresponding to the pH value represented by the comparison result and the second detection signal, and is used to output an adjustment signal, the adjustment signal indicates the reagent and the second dosage required to adjust the excessive calcium hardness, magnesium hardness and alkalinity; The first dosing module, the second dosing module, and the third dosing module are respectively connected to the control module. The first dosing module, the second dosing module, and the third dosing module are used to start when the mode operation signal is received to achieve the operation mode corresponding to the comparison result, and to add the agent corresponding to the first dosage or the agent corresponding to the second dosage to the water treatment equipment when the mode operation signal or the adjustment signal is received. The first dosing module is used to add lime to the water treatment equipment; The second dosing module is used to add sodium hydroxide to the water treatment equipment; The third dosing module is used to add sodium carbonate to the water treatment equipment.

[0006] By employing the above technical solution, the first and second detection modules detect the alkalinity, calcium hardness, and pH value of the water. This allows the control module to adjust its operating mode based on this data, employing a more suitable dosing scheme for hardness and alkalinity removal. This enables a single system to treat various types of municipal and industrial water for hardness and alkalinity removal by switching operating modes, thus reducing the cost of water treatment. Simultaneously, the third detection module re-detects the treated water, allowing for secondary adjustments based on alkalinity, calcium hardness, and magnesium hardness. This ensures the treated water quality better meets the standards for alkalinity, calcium hardness, and magnesium hardness.

[0007] Optionally, the outlets of the first dosing module, the second dosing module, and the third dosing module are all connected to dosing pipes. The dosing pipes of the first dosing module and the second dosing module extend into the first reaction tank, and the dosing pipe of the third dosing module extends into the second reaction tank.

[0008] By adopting the above technical solution, all the chemicals added to the water body can be added into the reaction tank, thereby reducing the consumption of chemicals.

[0009] Optionally, the portion of the dosing pipe located in the first reaction tank and the portion located in the second reaction tank are provided with a plurality of dosing holes, which are evenly distributed on the dosing pipe.

[0010] By adopting the above technical solution, when the added agent is added to the water body through multiple dosing holes, the agent can be more fully and evenly mixed and reacted with the water body, so as to save the agent to a certain extent.

[0011] Optionally, the first dosing module, the second dosing module, and the third dosing module each include a timing unit, a control unit, and a switching unit; The control unit is connected to the control module and is used to output a start signal when it receives the mode operation signal or the adjustment signal, and to output a stop signal after a preset duration of outputting the start signal, wherein the preset duration is associated with the first dosage or the second dosage. The timing unit is connected to the control unit and is used to start timing when the start signal is received, and to output a timing completion signal to the control unit when the timing time reaches a preset duration. The switch unit is connected to the control unit and is located at the medicine outlet. It is used to open when the start signal is received and to close when the stop signal is received.

[0012] By adopting the above technical solution, the dosage of medicine added to the water can be more accurately controlled using the timing unit, thereby saving medicine.

[0013] Optionally, the timing unit is integrated into the control unit.

[0014] By adopting the above technical solution, the delay caused by data transmission between the timing unit and the control unit can be reduced.

[0015] Optionally, the automatic control system further includes a fourth detection module; The fourth detection module is connected to the control module and is used to detect the pH value of the second water body and output a fourth detection signal to the control module.

[0016] By adopting the above technical solution, the pH value of the water can be monitored while the water is being discharged from the water treatment equipment.

[0017] Optionally, the fourth detection module is located inside the water outlet pipe connected to the water treatment equipment.

[0018] Optionally, the control module is connected to the first detection module, the second detection module, the third detection module, the fourth detection module, the first dosing module, the second dosing module, and the third dosing module via a wireless communication module.

[0019] By adopting the above technical solution, data transmission between the control module and various sensing devices can be made faster.

[0020] Secondly, this application provides an automatic control device for softening water, which adopts the following technical solution: An automatic control device for softening water includes water treatment equipment and an automatic control system according to any one of the first aspects.

[0021] Optionally, the water treatment equipment includes a pretreatment tank, a flocculation tank connected to the pretreatment tank, a sedimentation tank connected to the side of the flocculation tank away from the pretreatment tank, and a sludge discharge pipe with one end connected to the bottom of the sedimentation tank and a section away from the sedimentation tank connected to the pretreatment tank and the flocculation tank respectively. The top of the pretreatment tank is covered with a first cover plate. A partition plate is fixed to the bottom of the pretreatment tank and is spaced apart from the first cover plate. The partition plate divides the pretreatment tank into a coagulation chamber and a reaction chamber. The reaction chamber is located between the coagulation chamber and the flocculation tank and is connected to the flocculation tank. Both the coagulation chamber and the reaction chamber are equipped with inlet baffles and jet components. The inlet baffle in the coagulation chamber is close to the inlet side of the pretreatment tank, and the inlet baffle in the reaction chamber is close to the partition plate and is spaced apart from the partition plate. The jet components are located on the side of the inlet baffle facing the flocculation tank. A second cover plate is provided on the top of the flocculation tank, and a guide tube is installed inside the flocculation tank. A stirring assembly with its stirring end located inside the upper opening of the guide tube is installed on the second cover plate. The sedimentation tank is equipped with a third cover plate at the top, and a sludge scraper is installed on the third cover plate. The sedimentation tank is equipped with an inclined tube and a water collection trough embedded in the inclined tube. The bottom of the water collection trough is connected to the upper end of the inclined tube.

[0022] By adopting the above technical solution, wastewater enters the coagulation and reaction chambers under the guidance of the inlet baffle. The baffle's obstruction allows for more uniform mixing and reaction. Sludge containing sediment tends to accumulate in the dead corners at the bottom of the pretreatment tank over time; this can be addressed periodically by increasing the operating frequency of the bottom ejector and removing the sludge. The high-speed fluid ejected from the nozzles of the ejector carries the coagulant, achieving efficient mixing. Adding chemicals such as lime or soda ash to the pretreatment tank reacts with calcium and magnesium ions in the water, producing precipitates such as calcium carbonate and magnesium hydroxide. Most of these precipitates adhere to the coagulant's coagulation nuclei, reducing adhesion to the equipment and slowing down scaling.

[0023] In summary, this application includes at least one of the following beneficial technical effects: This application utilizes a first and a second detection module to detect the alkalinity, calcium hardness, and pH value of the water. This allows the control module to adjust its operating mode based on this data, employing a more suitable dosing scheme for hardness and alkalinity removal. This enables a single system to treat various types of municipal and industrial water for hardness and alkalinity removal by switching operating modes, thereby reducing the cost of water treatment. Simultaneously, a third detection module re-detects the treated water, allowing for secondary adjustments based on alkalinity, calcium hardness, and magnesium hardness. This ensures the treated water quality better meets the standards for alkalinity, calcium hardness, and magnesium hardness. Attached Figure Description

[0024] Figure 1 This is a system block diagram of an automatic control system for softening water according to an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the structure of a water treatment device for softening water according to an embodiment of this application.

[0026] Figure 3 This is a system block diagram of the dosing module according to an embodiment of this application.

[0027] Figure 4 This is a cross-sectional structural diagram of the pretreatment pool according to an embodiment of this application.

[0028] Figure 5 This is a cross-sectional structural diagram of the first cover plate, locking component, and water inlet baffle according to an embodiment of this application.

[0029] Figure 6 This is a cross-sectional structural diagram of the flocculation tank according to an embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Automatic control system; 11. First detection module; 12. Second detection module; 13. Third detection module; 14. Fourth detection module; 15. Control module; 16. First dosing module; 161. Control unit; 162. Timing unit; 163. Switch unit; 17. Second dosing module; 18. Third dosing module; 19. Wireless communication module; 2. Water treatment equipment; 21. Pretreatment tank; 211. First cover plate; 2111. Locking assembly; 21111. Outer shell; 21112. Sliding baffle; 21113. Locking rod; 21114. Spring; 21115. Sealing plate; 212. Divider plate; 213. Coagulation chamber; 214. Reaction chamber; 215. Sludge discharge pipe in coagulation zone; 216. Sludge discharge pipe in reaction zone; 217. Inlet baffle; 2171. Horizontal plate; 2172. Handle 218. Dosing pipe; 219. Jet assembly; 2191. First mounting pipe; 2192. Jet ejector; 22. Connecting pipe; 23. Flocculation tank; 231. Second cover plate; 232. Guide tube; 2321. Cylinder body; 2322. Flared section; 2323. Support plate; 233. Agitator; 2331. Agitator motor; 2332. Agitator shaft; 2333. Agitator blades; 234. Flocculant addition ring ; 235. Online pH meter; 2351. Second installation pipe; 236. First aeration device; 237. Sludge discharge pipe in flocculation zone; 24. Sedimentation tank; 241. Third cover plate; 242. Sludge scraper; 243. Second aeration device; 244. Inclined tube; 245. Water collection tank; 246. Water outlet pipe; 247. Sludge return pipe; 25. Sludge discharge pipe; 26. First reaction tank; 27. Second reaction tank. Detailed Implementation

[0031] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1-6 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0032] This application discloses an automatic control system for softening water, which can complete the hardness and alkalinity removal treatment of various municipal and industrial waters with a single system, thereby reducing the cost of water treatment. Furthermore, when the automatic control system 1 disclosed in this application is used in conjunction with a reasonable dosing scheme for water softening, it can also save on chemicals and reduce chemical costs.

[0033] Reference Figure 1 It is understood that the automatic control system 1 can be applied to the water treatment equipment 2. The water treatment equipment 2 is the equipment used for water treatment in municipal or industrial settings.

[0034] Reference Figure 1and Figure 2 In some embodiments, the water treatment device 2 may include a pretreatment tank 21, a flocculation tank 23 connected to the pretreatment tank 21, and a sedimentation tank 24 connected to the side of the flocculation tank 23 opposite to the pretreatment tank 21. As an example, when the water treatment device 2 further includes a coagulation tank, a first reaction tank 26, and a second reaction tank 27, the pretreatment tank 21 may be a reaction tank. The coagulation tank, the first reaction tank 26, the second reaction tank 27, the flocculation tank 23, and the sedimentation tank 24 are connected sequentially.

[0035] The automatic control system 1 includes a first detection module 11, a second detection module 12, a third detection module 13, a control module 15, a first dosing module 16, a second dosing module 17, and a third dosing module 18.

[0036] The first detection module 11 is used to detect the water body to be treated flowing into the water treatment equipment 2, detect the calcium hardness and alkalinity of the water body to be treated, and output a first detection signal representing the calcium hardness and alkalinity of the water body to be treated.

[0037] It is understood that water hardness can be divided into calcium hardness and magnesium hardness. To remove water hardness as much as possible, calcium and magnesium hardness need to be removed separately during water treatment. For calcium hardness, in some embodiments, alkalinity can be removed along with the calcium hardness. In this process, since the pH of the water is typically between 6 and 8, the alkalinity exists in the form of bicarbonate ions, meaning the alkalinity can be determined by detecting the volume molar concentration of bicarbonate ions. For calcium hardness, it can be determined by detecting the volume molar concentration of calcium ions. As an example, the first detection module 11 for detecting the calcium hardness and alkalinity of the water to be treated can be a calcium carbonate meter.

[0038] Furthermore, when using the first detection module 11 to detect the calcium hardness and alkalinity of the water to be treated, both alkalinity and calcium hardness can be expressed in terms of molality. Since the volume molality of hydrogen ions is the same as that of bicarbonate ions in the water to be treated, alkalinity can be determined by detecting the volume molality of hydrogen ions, i.e., hydrogen ion volume molality = 2 * alkalinity mass molality / 100. Correspondingly, calcium hardness can be determined using the following formula: calcium ion volume molality = calcium hardness mass molality / 100.

[0039] In some embodiments of the water treatment equipment 2, which includes a coagulation tank, a first reaction tank 26, and a second reaction tank 27, the first detection module 11 may be installed in the inlet pipe connected to the coagulation tank.

[0040] The second detection module 12 is used to detect the pH value of the first water body after it has been treated by the first reaction tank 26, and outputs a second detection signal representing the pH value.

[0041] Understandably, when performing hardness removal reactions on water, it's generally necessary to control the water's pH value above 10, for example, between 10.3 and 10.5, to facilitate the reaction. However, since the concentration ratios of various ions in different water bodies vary, their pH values ​​also differ. Therefore, when removing hardness from different water bodies, it's necessary to test the pH value to pre-treat the water before hardness removal. In a specific example, adding sodium hydroxide to the water body can replenish hydroxide ions, thereby increasing the pH value.

[0042] The control module 15 is connected to the first detection module 11 and the second detection module 12, respectively, and is used to receive the first detection signal and the second detection signal. When the first detection signal is received, the control module 15 compares the calcium hardness and alkalinity of the water to be treated and outputs a mode operation signal corresponding to the comparison result. The mode operation signal indicates the reagent and the first dosage corresponding to the pH value represented by the comparison result and the second detection signal.

[0043] Understandably, during water hardness removal reactions, when the water's pH value is greater than 10, bicarbonate ions in the water will convert to carbonate ions, which then react with calcium ions in a 1:1 ratio to form calcium carbonate precipitate, thereby achieving the purpose of removing calcium hardness. In this process, it is necessary to consider the relationship between the volume molar concentration of carbonate ions and the volume molar concentration of calcium ions to determine how much reagent to add to the water. Since the volume molar concentration of carbonate ions is the same as that of bicarbonate ions in this process, comparing the volume molar concentrations of carbonate ions and calcium ions essentially means comparing the mass molar concentration of alkalinity and the mass molar concentration of calcium hardness in the water. That is, based on the formula for calculating the mass molar concentration of alkalinity and the mass molar concentration of calcium hardness in the water, it can be derived that the comparison is between the mass molar concentration of 2*alkalinity and the mass molar concentration of calcium hardness.

[0044] Furthermore, in the first water body, the volume molar concentration of bicarbonate and the volume molar concentration of calcium ions can have three possible relationships: the volume molar concentration of bicarbonate is greater than that of calcium ions, the volume molar concentration of bicarbonate is less than that of calcium ions, and the volume molar concentration of bicarbonate is close to that of calcium ions. In some embodiments, each relationship corresponds to a specific dosing scheme to achieve the treatment of removing hardness and alkalinity from the water body. To this end, this application has determined three operating modes based on the relationship between the mass molar concentration of alkalinity and the mass molar concentration of calcium hardness in the water body. The amount of reagent to be added to the water body differs in each operating mode. Each operating mode will be described in detail below.

[0045] The first operating mode corresponds to the situation where the molality of 2*alkalinity is greater than the molality of calcium hardness. Specifically, when the molality of 2*alkalinity is greater than the molality of calcium hardness, it indicates that the volumetric molality of bicarbonate in the first water body is greater than the volumetric molality of calcium ions, meaning that there is an excess of carbonate ions during the reaction between carbonate and calcium ions. In this case, calcium ions need to be added to the first water body.

[0046] As an example, lime can be chosen as a reagent to supplement calcium ions. Further, it is necessary to accurately determine the amount of lime to be added. Specifically, the required volume molar concentration of calcium ions to be supplemented can be determined based on the volume molar concentration of bicarbonate and the volume molar concentration of calcium ions, i.e., the required volume molar concentration of calcium ions to be supplemented = (2 * mass molar concentration of alkalinity - mass molar concentration of calcium hardness) / 100. Then, the amount of lime to be added is determined based on the required volume molar concentration of calcium ions to be supplemented and the molecular weight of lime, i.e., the amount of lime added = the required volume molar concentration of calcium ions to be supplemented * the molecular weight of lime.

[0047] Furthermore, before adding lime, it is necessary to confirm whether the current water environment is suitable for hardness removal based on the pH value reflected by the second detection signal. Specifically, if the pH value of the first water body is lower than the suitable pH range for hardness removal, the pH value needs to be raised to that range before adding lime to the water body. In a specific example, sodium hydroxide can be chosen as the pH adjustment agent. The amount of sodium hydroxide added can also be calculated according to the above theory.

[0048] In summary, under the first operating mode, the reagents to be added are lime and sodium hydroxide, and the dosage of lime and sodium hydroxide can be determined as described above.

[0049] The second operating mode corresponds to the situation where the molality of 2*alkalinity is close to the molality of calcium hardness. Specifically, when the molality of 2*alkalinity is close to the molality of calcium hardness, it means that the volumetric molality of bicarbonate in the first water body is close to the volumetric molality of calcium ions. This means that during the reaction between carbonate and calcium ions, the carbonate content in the water body is just sufficient to remove calcium ions. In this case, it is not necessary to add carbonate or calcium ions to the first water body; only the addition of a reagent is needed to enable the hardness removal reaction. For example, if the pH of the first water body is lower than the suitable pH range for hardness removal, sodium hydroxide needs to be added. The amount of sodium hydroxide added can also be calculated according to the above theory.

[0050] In some embodiments, the approximation between the 2*alkalinity mass molar concentration and the calcium hardness mass molar concentration can be limited, and the difference between the two should not be too large. For example, the difference can be less than 30 mg / L.

[0051] In summary, the reagent that needs to be added in the second operating mode is sodium hydroxide.

[0052] The third operating mode corresponds to the situation where the 2*alkalinity molar concentration is less than the calcium hardness molar concentration. Specifically, when the 2*alkalinity molar concentration is less than the calcium hardness molar concentration, it indicates that the volume molar concentration of bicarbonate ions in the first water body is less than the volume molar concentration of calcium ions, meaning that calcium ions are in excess during the reaction between carbonate and calcium ions. In this case, carbonate ions need to be added to the first water body.

[0053] As an example, sodium carbonate can be chosen as the agent to supplement carbonate ions. Further, it is necessary to accurately determine the dosage of sodium carbonate. Specifically, the required molar concentration of carbonate ions to be supplemented can be determined based on the molar concentrations of bicarbonate and calcium ions. The required molar concentration of carbonate ions to be supplemented is the same as the required molar concentration of bicarbonate ions. The required molar concentration of carbonate ions to be supplemented = (molar concentration of calcium hardness - 2 * molar concentration of alkalinity) / 100. Then, the dosage of sodium carbonate to be supplemented is determined based on the required molar concentration of carbonate ions to be supplemented and the molecular weight of sodium carbonate, i.e., the dosage of sodium carbonate = the required molar concentration of carbonate ions to be supplemented * the molecular weight of sodium carbonate.

[0054] Furthermore, before adding sodium carbonate, it is necessary to confirm whether the current aquatic environment is suitable for hardness removal based on the pH value reflected by the second detection signal. Specifically, if the pH value of the first water body is lower than the suitable pH range for hardness removal, the pH value needs to be raised to that range before adding sodium carbonate. In a specific example, sodium hydroxide can be chosen as the pH adjusting agent. The dosage of sodium hydroxide can also be calculated according to the above theory.

[0055] In summary, under the third operating mode, the reagents that need to be added are sodium carbonate and sodium hydroxide. The dosage of sodium carbonate and sodium hydroxide can be determined as described above.

[0056] Based on the above, it can be seen that the first dosing module 16, the second dosing module 17, and the third dosing module 18 are used to add lime, sodium hydroxide, and sodium carbonate to the water body, respectively. As an example, the first dosing module 16 can be used to add lime to the water treatment equipment 2, the second dosing module 17 can be used to add sodium hydroxide to the water treatment equipment 2, and the third dosing module 18 can be used to add sodium carbonate to the water treatment equipment 2.

[0057] Meanwhile, based on the above, it can be determined that the dosing modules to be activated are different under different operating modes. Specifically, the first dosing module 16, the second dosing module 17, and the third dosing module 18 are connected to the control module 15. All three modules receive the mode operation signal and are activated upon receiving the signal to achieve the operating mode corresponding to the comparison result. Specifically, in the first operating mode, the first dosing module 16 and the second dosing module 17 are activated; in the second operating mode, the second dosing module 17 is activated; and in the third operating mode, both modules are activated. Conversely, if the first dosing module 16, the second dosing module 17, and the third dosing module 18 do not receive the mode operation signal, they are not activated.

[0058] Furthermore, after startup, the first dosing module 16, the second dosing module 17, and the third dosing module 18 are also used to add a corresponding first dosage of reagent to the water treatment equipment 2 upon receiving a mode operation signal. This means that the first dosing module 16, the second dosing module 17, or the third dosing module 18 can add a first dosage of reagent to the first water body during startup.

[0059] Regarding magnesium hardness, it's understood that magnesium hardness decreases as the water's pH increases, and the pH requirement for removing magnesium hardness is higher than that for removing calcium hardness. Therefore, when the automatic control system 1 operates in the first or third mode, raising the water's pH also facilitates the reaction between calcium ions and carbonate ions. Thus, by adjusting the water's pH, the water quality can first meet the magnesium hardness standard before adding lime or sodium carbonate for calcium hardness removal, effectively saving on chemicals. When the automatic control system 1 operates in the second mode, since both alkalinity and calcium hardness treatment are controlled by the water's pH, prioritizing calcium hardness before magnesium hardness removal is more conducive to system stability.

[0060] It is worth noting that various factors may exist during the hardness removal reaction of water bodies, leading to incomplete reactions. This results in the calculated dosage being a theoretical value, which deviates from the actual value. Therefore, after the hardness removal reaction, it is necessary to further test the alkalinity, calcium hardness, and magnesium hardness of the water body to adjust the water quality again.

[0061] In addition, after the hardness removal reaction of the water body is completed, and before the alkalinity, calcium hardness and magnesium hardness of the water body are tested a second time, the pH value of the water body should be adjusted back to neutral. For example, the pH value after adjustment by adding sulfate can be 6 to 8.

[0062] The third detection module 13 is used to detect the calcium hardness, magnesium hardness, and alkalinity of the second water body flowing out of the water treatment equipment 2, and outputs a third detection signal representing the calcium hardness, magnesium hardness, and alkalinity of the second water body.

[0063] In some embodiments, the second water body may be water obtained after treatment in sedimentation tank 24. Similar to the detection principle of the first detection module 11, a calcium carbonate meter can be used to detect the calcium hardness, magnesium hardness, and alkalinity of the second water body.

[0064] The control module 15 is also connected to the third detection module 13, which receives the third detection signal and outputs an adjustment signal. The adjustment signal indicates the amount of reagent and the second dosage required to adjust the excessive calcium hardness, magnesium hardness, and alkalinity. Specifically, the control module 15 can pre-store standard ranges for calcium hardness, magnesium hardness, and alkalinity for comparison with the values ​​reflected in the third detection signal.

[0065] Understandably, when the calcium hardness, magnesium hardness, or alkalinity of the second water body exceeds the standard, the automatic control system 1 will adopt different treatment schemes in each of the three operating modes. This will be further explained below based on the three operating modes.

[0066] In the first operating mode, if magnesium hardness exceeds the standard, sodium hydroxide can be added to raise the pH value of the water, thereby reducing magnesium hardness. This continues until the magnesium hardness reaches the standard range, stabilizing the pH value at that level. If alkalinity exceeds the standard, lime can be added to bring it within the standard range. In both cases, the required amount of sodium hydroxide or lime to be added can be determined using the aforementioned calculation method.

[0067] In the second operating mode, if magnesium hardness exceeds the standard, sodium hydroxide can be added to raise the pH value of the water, thereby reducing magnesium hardness. This continues until the magnesium hardness reaches its standard range, stabilizing the pH value at that level. If alkalinity or calcium hardness exceeds the standard, sodium hydroxide can be added to bring either alkalinity or calcium hardness down to their standard range. In both cases, the required amount of sodium hydroxide to be added can be determined using the aforementioned calculation method.

[0068] In the third operating mode, if magnesium hardness exceeds the standard, sodium hydroxide can be added to raise the pH value of the water, thereby reducing magnesium hardness. This continues until the magnesium hardness reaches its standard range, stabilizing the pH value at that level. If calcium hardness exceeds the standard, sodium carbonate can be added to bring it down to the standard range. In both cases, the required amount of sodium hydroxide or sodium carbonate to be added can be determined using the aforementioned calculation method.

[0069] Based on this, when it is determined that the calcium hardness, magnesium hardness, or alkalinity exceeds the standard, the control module 15 can determine the required reagent and the corresponding second dosage. Furthermore, if the calcium hardness, magnesium hardness, and alkalinity of the second water body do not exceed the standard, the second dosage is zero.

[0070] The first dosing module 16, the second dosing module 17, and the third dosing module 18 can also be used to receive adjustment signals and, upon receiving an adjustment signal, add a corresponding second dosage of reagent to the water treatment equipment 2. This means that the first dosing module 16, the second dosing module 17, or the third dosing module 18 can add a second dosage of reagent to the first water body during startup.

[0071] Reference Figure 3 In some embodiments, the dosing module can be configured to precisely add a first or second dosage of the agent to the water. Specifically, the first dosing module 16, the second dosing module 17, and the third dosing module 18 can each include a timing unit 162, a control unit 161, and a switching unit 163.

[0072] The control unit 161 is connected to the control module 15 and is used to receive mode operation signals or adjustment signals, output a start signal when the mode operation signal or adjustment signal is received, and output a stop signal after a preset time after the start signal is output.

[0073] In some embodiments, the preset duration can be associated with a first dosage or a second dosage. Specifically, this can be achieved by setting the dosage of the dosing module per unit time so that the dosage per unit time is a single unit. Based on this, the preset duration is the value corresponding to the first or second dosage. Specifically, this can be achieved by adjusting the size of the dosing module's outlet.

[0074] The timing unit 162 is connected to the control unit 161 and is used to receive a start signal, start timing upon receiving the start signal, and output a timing completion signal to the control unit 161 when the timing time reaches a preset duration. As an example, the timing unit 162 can be a timer. Of course, the timing unit 162 can also be integrated into the control unit 161, meaning the control unit 161 can be a controller with timing functionality.

[0075] The switch unit 163 is connected to the control unit 161 and can be located at the outlet of the dosing module. It receives start or stop signals, opening when a start signal is received and closing when a stop signal is received. When the switch unit 163 is open, the chemicals in the dosing module can be added to the water through the outlet. Conversely, when the switch unit 163 is closed, the chemicals in the dosing module cannot flow out through the outlet. As an example, the switch unit 163 can be an electrically controlled valve.

[0076] Reference Figure 1 , Figure 2 and Figure 4 Furthermore, in order to ensure that all added chemicals are added to the water body, in some embodiments, the outlets of the first dosing module 16, the second dosing module 17, and the third dosing module 18 are all connected to dosing pipes 218, and the dosing pipes 218 of the first dosing module 16, the second dosing module 17, and the third dosing module 18 all extend into the corresponding treatment tanks in the water treatment equipment 2.

[0077] In a specific example of a water treatment device 2 including a coagulation tank, a first reaction tank 26, and a second reaction tank 27, the first reaction tank 26 can be dedicated to the addition of alkaline agents, and the second reaction tank 27 can be dedicated to the addition of saline agents. Specifically, the dosing pipe 218 of the first dosing module 16 and the dosing pipe 218 of the second dosing module 17 extend into the first reaction tank 26, and the dosing pipe 218 of the third dosing module 18 extends into the second reaction tank 27. Furthermore, the portions of the dosing pipe 218 located in the first reaction tank 26 and the portions located in the second reaction tank 27 can have multiple dosing holes. These multiple dosing holes are evenly distributed on the dosing pipe 218, allowing the agents to react more evenly and fully with the water when added from these holes. Of course, the size and number of dosing holes can be adjusted to ensure that the dosing amount per unit time of the dosing module is a single unit.

[0078] In some embodiments, the automatic control system 1 further includes a fourth detection module 14. The fourth detection module 14 is connected to the control module 15 and is used to detect the pH value of the second water body and output a fourth detection signal to the control module 15. By setting the fourth detection module 14, the pH value of the second water body can be detected when the second water body is discharged from the water treatment device 2. As an example, the fourth detection module 14 can be installed in the outlet pipe 246 connected to the water treatment device 2, specifically in the outlet pipe 246 connected to the sedimentation tank 24.

[0079] In some embodiments, the control system is connected to the first detection module 11, the second detection module 12, the third detection module 13, the fourth detection module 14, the first dosing module 16, the second dosing module 17, and the third dosing module 18 via a wireless communication module 19. The control system may be an MCU.

[0080] The implementation principle of the automatic control system for softening water according to this application is as follows: The first detection module 11 and the second detection module 12 detect the alkalinity, calcium hardness, and pH value of the water. Based on this data, the control module 15 adjusts the current operating mode to adopt a more suitable dosing scheme for hardness and alkalinity removal. This allows a single system to complete hardness and alkalinity removal treatment for various types of municipal and industrial water by switching operating modes, thus reducing water usage costs. Furthermore, when the automatic control system 1 disclosed in this application is used in conjunction with a reasonable dosing scheme for water softening treatment, it can also achieve the effects of saving chemicals and reducing chemical costs.

[0081] This application also discloses an automatic control device for softening water.

[0082] Reference Figure 1 The automatic control device for softening water includes water treatment equipment 2 and automatic control system 1 in the first embodiment.

[0083] In some embodiments, the water treatment device 2 may be a device specifically designed for wastewater treatment. (Refer to...) Figure 2 The water treatment equipment 2 includes a pretreatment tank 21, a connecting pipe 22 that is inclined and fixed at its upper end to the outer wall of the pretreatment tank 21, a flocculation tank 23 whose outer wall is fixed to the lower end of the connecting pipe 22, a sedimentation tank 24 that is connected to the side of the flocculation tank 23 away from the connecting pipe 22, and a sludge discharge pipe 25 that is fixed at one end to the bottom of the sedimentation tank 24 and is connected to the bottom of the pretreatment tank 21 and the bottom of the flocculation tank 23 respectively.

[0084] Reference Figure 4 The pretreatment tank 21 is square in shape, with rounded corners to avoid dead angles and facilitate cleaning of sediment inside. The top of the pretreatment tank 21 is open, covered by a first cover plate 211. A partition plate 212 is vertically fixed to the bottom of the pretreatment tank 21, with its top spaced apart from the first cover plate 211. The partition plate 212 divides the interior of the pretreatment tank 21 into a coagulation chamber 213 and a reaction chamber 214, with the connecting pipe 22 communicating with the upper part of the reaction chamber 214.

[0085] Reference Figure 4 A sludge discharge pipe 215 for the coagulation zone and a sludge discharge pipe 216 for the reaction zone are fixedly installed on the outer bottom of the pretreatment tank 21. One end of the sludge discharge pipe 215 is connected to the interior of the coagulation zone, and the other end is fixedly connected to and connected to the sludge discharge pipe 25. One end of the sludge discharge pipe 216 is connected to the interior of the reaction zone, and the other end is fixedly connected to and connected to the sludge discharge pipe 25.

[0086] Reference Figure 4 An inlet baffle 217, a dosing pipe 218, and a jet assembly 219 are respectively installed in the coagulation chamber 213 and the reaction chamber 214. The inlet baffle 217 is inserted into the first cover plate 211. The dosing pipe 218 is the pipe that communicates with the dosing module. The dosing pipe 218 is vertically inserted through the first cover plate 211 and spaced apart from the inlet baffle 217. The jet assembly 219 is fixed to the lower surface of the first cover plate 211 and is located between the inlet baffle 217 and the dosing pipe 218. The inlet baffle 217, located in the coagulation chamber 213, is located on the side of the coagulation chamber 213 away from the partition plate 212. The upper part of the side wall of the coagulation chamber 213 near the inlet baffle 217 is connected to an external sewage source. The dosing pipe 218, located in the coagulation chamber 213, is located between the jet assembly 219 and the partition plate 212. The water inlet baffle 217 located in the reaction chamber 214 is located on the side close to the partition plate 212 and is arranged at intervals with the partition plate 212, so that the partition plate 212 and the water inlet baffle 217 located in the reaction chamber 214 form a water inlet passage for the reaction chamber 214.

[0087] Combination Figure 4 and Figure 5 The first cover plate 211 has a strip-shaped hole for inserting a water inlet baffle 217 into the pretreatment tank 21. The water inlet baffle 217 is adapted to the strip-shaped hole and inserted into it. A strip-shaped horizontal plate 2171 is fixedly connected to the upper surface of the water inlet baffle 217. A handle 2172 is fixedly connected to the upper surface of the horizontal plate 2171. The handle 2172 and the water inlet baffle 217 are located on the two surfaces of the horizontal plate 2171, respectively. The width of the horizontal plate 2171 is greater than the width of the strip-shaped hole. After the horizontal plate 2171 abuts against the first cover plate 211, the bottom of the water inlet baffle 217 is suspended above the inner bottom of the pretreatment tank 21.

[0088] Reference Figure 5 A locking assembly 2111 is fixedly disposed on the surface of the first cover plate 211. The locking assembly 2111 includes a housing 21111 fixed to the first cover plate 211 with an open end and a closed end respectively; a sliding baffle 21112 movably disposed inside the housing 21111; a locking rod 21113 passing through the middle of the sliding baffle 21112 and slidingly passing through the closed end of the housing 21111 at one end; a spring 21114 sleeved on the locking rod 21113 and located on a section of the locking rod 21113 near the open end of the housing 21111; and a locking rod fixedly disposed on the open end of the housing 21111. A sliding sealing plate 21115 is slidably inserted. A locking rod 21113 is fixedly connected to a sliding baffle 21112. The length of the locking rod 21113 is greater than the sum of the lengths of the outer shell 21111 and the sealing plate 21115. Furthermore, the length of the section of the locking rod 21113 outside the sealing plate 21115 is greater than the length of the section of the locking rod 21113 outside the closed end of the outer shell 21111. The locking rod 21113 is spaced apart from the upper surface of the first cover plate 211. A horizontal plate 2171 can be located between the locking rod 21113 and the first cover plate 211, and the outer wall of the locking rod 21113 is in contact with the upper surface of the horizontal plate 2171. A spring 21114 is extended and located inside the outer shell 21111, with its two ends abutting against the opposing surfaces of the sliding baffle 21112 and the sealing plate 21115, respectively.

[0089] The locking rod 21113 is a strip rod with a rectangular end face. The section of the locking rod 21113 located outside the closed end of the outer casing 21111 has an upward inclined surface facing the handle 2172. When the water inlet baffle 217 is inserted into the strip hole, the horizontal plate 2171 abuts against the inclined surface, which allows the locking rod 21113 to automatically retract into the outer casing 21111, thereby facilitating the locking of the water inlet baffle 217.

[0090] Reference Figure 4A dosing pipe 218, passing through the upper surface of the first cover plate 211, is connected to a dosing device at one end. Multiple sets of outlet holes are evenly spaced along a section of the dosing pipe 218 within the pretreatment tank 21. The jet assembly 219 includes a vertically mounted first mounting pipe 2191, its upper end fixed to the lower surface of the first cover plate 211, and jet injectors 2192 evenly spaced along the length of the first mounting pipe 2191. Wires are connected to the jet injectors 2192, passing through the first mounting pipe 2191 and connected to an external power source. Multiple jet injectors 2192 are arranged corresponding to multiple sets of outlet holes. After lime, sodium carbonate, and sodium hydroxide are added to the coagulation chamber 213 through the dosing pipe 218, the jet injectors 2192 spray wastewater, which is then agitated by fluid dynamics to form a circulating flow, allowing the chemicals and wastewater to mix rapidly and efficiently. Chemical agents such as lime or sodium carbonate react with calcium and magnesium ions in water to produce precipitates such as calcium carbonate and magnesium hydroxide. Most of these precipitates adhere to the coagulation nuclei of the coagulant, reducing their adhesion to the equipment and slowing down scaling.

[0091] The upper end of the connecting pipe 22 is located near the upper part of the pretreatment tank 21. Flanges are fixed to the outer walls of both the pretreatment tank 21 and the flocculation tank 23. Flanges are also provided at both ends of the connecting pipe 22. The connecting pipe 22 is connected between the pretreatment tank 21 and the flocculation tank 23 through the flanges, which facilitates the disassembly and cleaning of the connecting pipe 22 after long-term use.

[0092] In some embodiments where the water treatment equipment 2 also includes a coagulation tank, a first reaction tank 26, and a second reaction tank 27, the reaction tank serving as the pretreatment tank 21 can also be configured in the manner described above.

[0093] Reference Figure 6 The flocculation tank 23 is square in shape, with rounded corners to avoid dead angles and facilitate cleaning of sediment in the pretreatment tank 21. The top of the flocculation tank 23 is open, and a second cover plate 231 is provided at the opening. A guide tube 232 is vertically fixed inside the flocculation tank 23 and its lower end is fixed to the bottom of the flocculation tank 23. The guide tube 232 includes a vertically arranged cylinder 2321 with openings at both ends, a flared section 2322 fixed to the lower end of the cylinder 2321 and flared in shape, and multiple support plates 2323 arranged at equal angles around the flared section 2322. The smaller opening end of the flared section 2322 is connected to the lower end of the cylinder 2321. The outer wall of the cylinder 2321 is spaced apart from the inner wall of the flocculation tank 23. The lower end of the support plate 2323 is fixed to the inner bottom of the flocculation tank 23, and the lower end of the cylinder 2321 is suspended above the inner bottom of the flocculation tank 23.

[0094] A stirrer 233 is provided on the second cover plate 231. The stirrer 233 includes a stirring motor 2331 fixedly mounted on the upper surface of the second cover plate 231 with its shaft vertically mounted, a stirring shaft 2332 vertically mounted and whose upper end is fixedly connected to the shaft of the stirring motor 2331, and stirring blades 2333 installed at the lower end of the stirring shaft 2332 and located in the upper opening of the cylinder 2321. A flocculant adding ring 234 in a circular shape and located below the stirring blades 2333 is also provided inside the guide cylinder 232. The flocculant adding ring 234 is made of tubular material and has several dosing holes on its outer wall. The flocculant adding ring 234 is connected to an external dosing device.

[0095] A second mounting pipe 2351 is vertically fixed to the lower surface of the second cover plate 231. The second mounting pipe 2351 is located on the side of the guide tube 232 away from the connecting pipe 22. An online pH meter 235 is installed at the lower end of the second mounting pipe 2351. The online pH meter 235 can be connected to an external terminal of the sedimentation device via wired or wireless connection to monitor the pH value of the wastewater entering the flocculation tank 23 in real time. The bottom of the flocculation tank 23 on the side away from the connecting pipe 22 is connected to the sedimentation tank 24. A first aeration device 236 is installed at the bottom of the flocculation tank 23, inclined towards the guide tube 232, which reduces the accumulation of sludge at the bottom of the plug flow zone and slows down scaling. A flocculation zone sludge discharge pipe 237 is fixedly connected to the bottom of the flocculation tank 23. One end of the flocculation zone sludge discharge pipe 237 is fixedly connected to and communicates with the flocculation tank 233, and the other end of the flocculation zone sludge discharge pipe 237 is fixedly connected to and communicates with the sludge discharge pipe 25.

[0096] Wastewater enters the flocculation tank 23 through the reaction chamber 214 via the connecting pipe 22 and then enters the guide tube 232, forming an internal circulation inside the guide tube 232. Flocculant polyacrylamide solution is added through the flocculant dosing ring. Under the action of the agitator 233, the wastewater in the guide tube 232 can be fully mixed with the wastewater in two directions, from top to bottom and from bottom to top. After being slowly stirred by the agitator 233 for -min, the complex compounds and complex flocs formed rapidly aggregate and grow larger.

[0097] Reference Figure 2 One side of the sedimentation tank 24 is connected to the flocculation tank 23. The top of the sedimentation tank 24 is open, and its interior is circular. A third cover plate 241 is installed at the open. A sludge scraper 242 is installed on the third cover plate 241 at the center of the sedimentation tank 24. A second aeration device 243 is installed inside the sedimentation tank 24, near the open section. Several inclined tubes 244 in a honeycomb shape are installed on the upper part of the second aeration device 243. Multiple receiving tanks are formed at intervals at the upper end of the inclined tubes 244. A water collection tank 245 is set in the receiving tank. The bottom of the water collection tank 245 is connected to the upper end of the inclined tubes 244, allowing a stream of clean water to enter the water collection tank 245.

[0098] A sludge return pipe 247 is installed on the outer bottom of the sedimentation tank 24. One end of the sludge return pipe 247 is fixedly connected to and communicates with the sedimentation tank 24, and the other end passes through the second cover plate 231 and is located inside the flocculation tank 23. A sludge pump is installed on the sludge return pipe 247, which can transport the sludge deposited in the sedimentation tank 24 back to the flocculation zone. The sludge return flow rate can be adjusted according to the on-site operating conditions. Under the condition that the polymer and sewage are fully mixed, the injection of return sludge greatly enhances the flocculation effect, producing large and uniform flocs that can settle quickly. By adjusting the frequency of the sludge circulation pump, the sludge circulation volume can be varied to cope with changes in the influent flow rate and load.

[0099] Sludge pumps are installed on the sludge discharge pipe 215 in the coagulation zone, the sludge discharge pipe 216 in the reaction zone, the sludge discharge pipe 237 in the flocculation zone, and the sludge discharge pipe 25. These pumps are used to periodically pump out and clean the sludge in the sedimentation device, thereby reducing the scaling problem caused by sludge accumulation and also reducing the workload of maintenance personnel to clean the bottom of the pool.

[0100] The inner surfaces of the pretreatment tank 21, flocculation tank 23 and sedimentation tank 24 are coated with a hydrophobic layer. The hydrophobic layer is made of a coating material with added polytetrafluoroethylene. The polytetrafluoroethylene coating is hydrophobic and has low surface energy, which can effectively inhibit the formation of scale nuclei on its surface.

[0101] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. An automatic control system for softening water, characterized in that: It includes a first detection module (11), a second detection module (12), a third detection module (13), a control module (15), a first dosing module (16), a second dosing module (17), and a third dosing module (18); The first detection module (11) is used to detect the water body to be treated flowing into the water treatment equipment (2), detect the calcium hardness and alkalinity of the water body to be treated, and output a first detection signal representing the calcium hardness and alkalinity of the water body to be treated. The water treatment equipment (2) includes a coagulation tank, a first reaction tank (26), a second reaction tank (27), a flocculation tank (23), and a sedimentation tank (24) connected in sequence. The second detection module (12) is used to detect the pH value of the first water body after the water body to be treated has been treated by the first reaction tank (26), and output a second detection signal representing the pH value; The third detection module (13) is used to detect the calcium hardness, magnesium hardness and alkalinity of the second water body flowing out from the water treatment equipment (2), and outputs a third detection signal representing the calcium hardness, magnesium hardness and alkalinity of the second water body; The control module (15) is connected to the first detection module (11), the second detection module (12) and the third detection module (13) respectively. It is used to compare the calcium hardness and alkalinity of the water to be treated, output a mode operation signal corresponding to the comparison result, the mode operation signal indicating the reagent and the first dosage corresponding to the pH value represented by the comparison result and the second detection signal, and output an adjustment signal indicating the reagent and the second dosage required to adjust the excessive calcium hardness, magnesium hardness and alkalinity. The first dosing module (16), the second dosing module (17), and the third dosing module (18) are respectively connected to the control module (15). The first dosing module (16), the second dosing module (17), and the third dosing module (18) are used to start when the mode operation signal is received to achieve the operation mode corresponding to the comparison result, and to add the agent corresponding to the first dosage or the agent corresponding to the second dosage to the water treatment equipment (2) when the mode operation signal or the adjustment signal is received. The first dosing module (16) is used to add lime to the water treatment equipment (2); The second dosing module (17) is used to add sodium hydroxide to the water treatment equipment (2); The third dosing module (18) is used to add sodium carbonate to the water treatment equipment (2).

2. The automatic control system for softening water according to claim 1, characterized in that: The outlets of the first dosing module (16), the second dosing module (17), and the third dosing module (18) are all connected to dosing pipes (218). The dosing pipes (218) of the first dosing module (16) and the second dosing module (17) extend into the first reaction tank (26), and the dosing pipes (218) of the third dosing module (18) extend into the second reaction tank (27).

3. The automatic control system for softening water according to claim 2, characterized in that: The dosing pipe (218) has multiple dosing holes in the portion located in the first reaction tank (26) and the portion located in the second reaction tank (27), and the multiple dosing holes are evenly distributed on the dosing pipe (218).

4. The automatic control system for softening water according to any one of claims 1 to 3, characterized in that: The first dosing module (16), the second dosing module (17) and the third dosing module (18) each include a timing unit (162), a control unit (161) and a switching unit (163); The control unit (161) is connected to the control module (15) and is used to output a start signal when the mode operation signal or the adjustment signal is received, and to output a stop signal after a preset duration of outputting the start signal, wherein the preset duration is associated with the first dosage or the second dosage. The timing unit (162) is connected to the control unit (161) and is used to start timing when the start signal is received, and to output a timing completion signal to the control unit (161) when the timing time reaches the preset duration. The switch unit (163) is connected to the control unit (161) and is located at the medicine outlet. It is used to open when the start signal is received and to close when the stop signal is received.

5. The automatic control system for softening water according to claim 4, characterized in that: The timing unit (162) is integrated into the control unit (161).

6. The automatic control system for softening water according to claim 1, characterized in that: The automatic control system (1) also includes a fourth detection module (14); The fourth detection module (14) is connected to the control module (15) and is used to detect the pH value of the second water body and output a fourth detection signal to the control module (15).

7. The automatic control system for softening water according to claim 6, characterized in that: The fourth detection module (14) is located in the outlet pipe (246) connected to the water treatment equipment (2).

8. The automatic control system for softening water according to claim 6, characterized in that: The control module (15) is connected to the first detection module (11), the second detection module (12), the third detection module (13), the fourth detection module (14), the first dosing module (16), the second dosing module (17), and the third dosing module (18) via a wireless communication module (19).

9. An automatic control device for softening water, characterized in that: The automatic control device includes a water treatment device (2) and an automatic control system (1) as described in any one of claims 1 to 8.

10. The automatic control device for softening water quality according to claim 9, characterized in that: The water treatment equipment (2) includes a pretreatment tank (21), a flocculation tank (23) connected to the pretreatment tank (21), a sedimentation tank (24) connected to the side of the flocculation tank (23) away from the pretreatment tank (21), and a sludge discharge pipe (25) with one end connected to the bottom of the sedimentation tank (24) and a section away from the sedimentation tank (24) connected to the pretreatment tank (21) and the flocculation tank (23) respectively. The pretreatment tank (21) is covered with a first cover plate (211). A partition plate (212) is fixed to the bottom of the pretreatment tank (21) and the partition plate (212) is spaced apart from the first cover plate (211). The partition plate (212) divides the pretreatment tank (21) into a coagulation chamber (213) and a reaction chamber (214). The reaction chamber (214) is located between the coagulation chamber (213) and the flocculation tank (23) and is connected to the flocculation tank (23). Both the coagulation chamber (213) and the reaction chamber (214) are equipped with inlet baffles (217) and jet components (219). The inlet baffle (217) in the coagulation chamber (213) is close to the inlet side of the pretreatment tank (21), and the inlet baffle (217) in the reaction chamber (214) is close to the partition plate (212) and is arranged at intervals from the partition plate (212). The jet components (219) are respectively located on the side of the inlet baffle (217) facing the flocculation tank (23). The top of the flocculation tank (23) is provided with a second cover plate (231), and a guide tube (232) is installed inside the flocculation tank (23). A stirring assembly with the stirring end located inside the upper opening of the guide tube (232) is installed on the second cover plate (231). The sedimentation tank (24) is provided with a third cover plate (241) on top, and a sludge scraper (242) is installed on the third cover plate (241). The sedimentation tank (24) is provided with an inclined tube (244) and a water collection trough (245) embedded in the inclined tube (244). The bottom of the water collection trough (245) is connected to the upper end of the inclined tube (244).

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