A wastewater treatment system and method for sand and gravel processing

Abstract

This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system and method for sand and gravel processing. The system includes a wastewater tank, a dosing tank, and a control module. The wastewater tank is equipped with an inlet pipe and an outlet pipe. The dosing tank is connected to the wastewater tank via a dosing pipe equipped with a dosing pump. The dosing tank is equipped with a third detection unit, a fourth detection unit, a mixing chamber, and a premixing chamber. This application eliminates the need for stirring and mixing within the dosing tank by incorporating a premixing chamber and a mixing chamber in the dosing tank. The high-concentration chemical solution is diluted to a preset concentration in the mixing chamber, and new chemical solution is continuously added to the dosing tank. This allows for continuous and automatic dosing of the wastewater by a single dosing tank, ensuring that the dosage matches the wastewater treatment demand. This effectively reduces the production, operating, and maintenance costs of the sand and gravel processing wastewater treatment system.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system and method for sand and gravel processing. Background Technology

[0002] Wastewater from sand and gravel processing mainly originates from the crushing, screening, and washing processes of ores (such as granite and limestone). It is characterized by high suspended solids (the wastewater contains a large amount of fine particulate matter, such as stone powder (particle size mostly below 0.075mm), mud powder, and clay), high turbidity (due to the large number of fine suspended particles scattering and absorbing light, the water has very high turbidity and extremely low transparency), and high color (clay minerals and iron oxides in the wastewater give it a certain color, resulting in high color intensity). The core pollution indicator for sand and gravel processing wastewater is suspended solids, and the core goal of its treatment is to achieve "mud-water separation."

[0003] The existing process route for wastewater from sand and gravel processing is generally as follows: wastewater is first collected in a sedimentation tank, then large suspended solids and debris are filtered out using a screen, and then chemicals (such as coagulants and flocculants) are added to the wastewater tank to induce a chemical reaction. Then, the wastewater passes through a separation unit to separate the clear water and flocs. The clear water can be recycled, while the separated sludge can be mechanically dewatered and then used for comprehensive utilization (such as brick making, filling materials, backfill soil, cement production auxiliary materials, etc.).

[0004] To achieve continuous and automated dosing in wastewater tanks, two dosing tanks are typically configured to add chemicals to the wastewater tank in a coordinated manner. However, during the development of this invention, the applicant discovered that the cost of using the wastewater tank chemical dosing module is high due to structural limitations. Summary of the Invention

[0005] The purpose of this application is to provide a wastewater treatment system and method for sand and gravel processing, thereby solving the aforementioned technical problems existing in the prior art.

[0006] This application is implemented as follows:

[0007] In a first aspect, this application provides a wastewater treatment system for sand and gravel processing, comprising:

[0008] A wastewater tank is provided with an inlet pipe and an outlet pipe. The inlet pipe is equipped with a first detection unit for detecting the inlet flow rate and turbidity, and the outlet pipe is equipped with a second detection unit for detecting the outlet flow rate and turbidity.

[0009] The dosing tank is connected to the sewage tank via a dosing pipe. A dosing pump is installed on the dosing pipe. The dosing tank is equipped with a third detection unit, a fourth detection unit, a mixing chamber, and a premixing chamber. The third and fourth detection units are used for liquid level detection in the dosing tank. The fourth detection unit is located above the third detection unit. The connection between the dosing pipe and the dosing tank is located below the third detection unit. The premixing chamber is used to store the drug solution. The concentration of the drug solution in the premixing chamber is higher than the concentration of the drug solution in the dosing tank. The premixing chamber is connected to the top of the mixing chamber via a drain branch pipe. The top of the mixing chamber is connected to a clean water pipe. A first control valve is installed on the clean water pipe. A second control valve is installed on the drain branch pipe. Multiple baffles are installed in the mixing chamber. The bottom of the mixing chamber is connected to the dosing tank.

[0010] The control module is connected to the first detection unit, the second detection unit, the third detection unit, the fourth detection unit, and the dosing pump. The control module is configured to: determine the dosage of the dosing pump based on the detection signals of the first and second detection units to match the dosage with the wastewater treatment requirements; and determine the opening degree of the first and second control valves based on the detection signals of the third and fourth detection units to achieve quantitative replenishment of the chemical solution in the dosing tank.

[0011] Furthermore, the clean water pipe is connected to the top of the mixing chamber through the first branch pipe, the first control valve is installed on the first branch pipe, the clean water pipe is connected to the premixing chamber through the second branch pipe, the second branch pipe is equipped with a third control valve, the premixing chamber is equipped with an overflow pipe, the overflow pipe is connected to the drain branch pipe through the second control valve, and the second control valve is a three-way valve.

[0012] Furthermore, a fifth detection unit is provided on the drain branch pipe, which is used to detect the flow rate of the drain branch pipe. The fifth detection unit is located between the second control valve and the mixing chamber.

[0013] Furthermore, the control module is also configured to: determine the opening degree of the second control valve and the third control valve based on the detection signal of the fifth detection unit, so as to achieve quantitative water solubility of the premixed indoor agent.

[0014] Furthermore, the outlet of the mixing chamber is provided with a sixth detection unit, which is used to detect the flow rate of the outlet of the mixing chamber. The control module is also configured to: determine the opening degree of the first control valve and the second control valve based on the detection signals of the fifth detection unit and the sixth detection unit, so as to realize the mixing chamber to replenish the dosing tank with a stable concentration of drug solution.

[0015] And / or, along the direction of gravity, the premixing chamber is located above the mixing chamber.

[0016] Furthermore, the premixing chamber is equipped with a stirring mechanism and a dosing port. The dosing port is used to add chemicals into the premixing chamber, and the stirring mechanism is used to stir and mix the water and chemicals in the premixing chamber.

[0017] And / or, the premixing chamber is provided with a heating unit, which is used to heat the clean water in the premixing chamber.

[0018] Furthermore, the dosing tank is provided with an upper baffle and a lower baffle. There is a first flow gap between the upper baffle and the inner wall of the dosing tank, and a second flow gap between the upper baffle and the lower baffle. The upper baffle is located above the lower baffle. The lower baffle is provided with a through hole. The third detection unit is located between the upper baffle and the lower baffle. The outlet of the mixing chamber corresponds to the upper baffle.

[0019] Furthermore, a counterweight float is provided in the dosing tank. The counterweight float is located below the upper partition plate. A sliding cylinder corresponding to the through hole is provided on the counterweight float. The sliding cylinder has a sliding stroke along the direction of gravity. When the liquid in the dosing tank is at a preset water level, the buoyancy and gravity of the counterweight float are balanced, and the sliding cylinder is in the through hole. The preset water level is above the third detection unit and is set close to the third detection unit. When the liquid in the dosing tank is above the preset water level, there is a preset gap between the sliding cylinder and the lower partition plate.

[0020] Furthermore, the counterweight float is slidably connected to the upper partition via a guide rod, so as to realize that the sliding cylinder has a sliding stroke along the direction of gravity. A limit block is provided on the guide rod, and the limit block is located above the upper partition.

[0021] And / or, the input port of the dosing tube is located below the lower partition.

[0022] Secondly, this application provides a method for treating wastewater from sand and gravel processing, based on the aforementioned wastewater treatment system for sand and gravel processing.

[0023] The technical solution provided in this application can achieve the following beneficial effects:

[0024] This application, by setting a premixing chamber and a mixing chamber on the dosing tank, allows for continuous replenishment of the dosing tank when the amount of chemical solution in the dosing tank is low. The high-concentration chemical solution in the premixing chamber is then diluted to a preset concentration through the mixing chamber. This eliminates the need for stirring and mixing in the dosing tank, allowing for continuous replenishment of the dosing tank under operating conditions without the need to shut down the dosing tank or wastewater tank. This achieves continuous and automatic dosing of chemicals in conjunction with the wastewater tank, and the amount of chemicals added matches the wastewater treatment demand during the dosing process, effectively reducing the production, operating, and maintenance costs of the sand and gravel processing wastewater treatment system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the wastewater treatment system for sand and gravel processing in this application;

[0027] Figure 2 This is a schematic diagram of the chemical dosing tank in this application;

[0028] Figure 3 This is a schematic diagram of the internal structure of the dosing tank in this application;

[0029] Figure 4 This is a schematic diagram of the piping connection between the mixing chamber and the premixing chamber in this application;

[0030] Figure 5 This is a schematic diagram showing the connection between the upper and lower partitions of this application;

[0031] Figure 6 This is a diagram showing the state of the counterweight float in the chemical dosing tank when the liquid level is at the preset level.

[0032] Figure 7 This is a diagram showing the state of the counterweight float in the chemical dosing tank when the liquid level is high.

[0033] Figure 8 This is a schematic diagram illustrating the principle of chemical dosage control in the sand and gravel processing wastewater treatment system of this application.

[0034] In the picture:

[0035] 100. Wastewater tank; 110. Inlet pipe; 111. First detection unit; 120. Outlet pipe; 200. Dosing tank; 201. Third detection unit; 202. Fourth detection unit; 210. Premixing chamber; 211. Drainage branch pipe; 212. Overflow pipe; 213. Second control valve; 214. Fifth detection unit; 215. Dosing port; 216. Stirring mechanism; 217. Heating unit; 220. Mixing chamber; 221. Baffle plate; 222. Sixth detection unit; 230. Dosing pipe; 231. Dosing pump; 240. Clean water pipe; 241. First branch pipe; 242. Second branch pipe; 243. First control valve; 244. Third control valve; 250. Upper partition plate; 251. Support component; 260. Lower partition plate; 261. Through hole; 270. Counterweight float; 271. Sliding cylinder; 272. Guide rod; 273. Limiting block. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] To achieve continuous and automated dosing in wastewater tanks, existing technologies typically employ two dosing tanks to collaboratively add chemicals. Each tank is equipped with a stirring mechanism. When the chemical solution in one tank is insufficient, the other tank takes over. For the tank with insufficient solution, a predetermined amount of chemical and clean water must first be added, and then the mixture is stirred thoroughly before it can take over from the other tank, thus achieving continuous and automated dosing in the wastewater tank. However, using two dosing tanks increases the manufacturing and maintenance costs of the sand and gravel processing wastewater treatment system. Therefore, this application provides a sand and gravel processing wastewater treatment system and method. By setting a premixing chamber and a mixing chamber on the dosing tank, when the chemical solution in the dosing tank is low, a high-concentration chemical solution is first formed in the premixing chamber. Then, the chemical solution is diluted to a preset concentration through the mixing chamber (the preset concentration is exactly the same as the concentration of the residual chemical solution in the dosing tank). New chemical solution is continuously added to the dosing tank, eliminating the need for stirring and mixing in the dosing tank. This allows the dosing tank to be continuously replenished under working conditions without stopping the dosing tank or the wastewater tank. It realizes continuous automatic dosing of a dosing tank in conjunction with the wastewater tank, and the dosage matches the wastewater treatment demand. This effectively reduces the production cost, operating cost and maintenance cost of the sand and gravel processing wastewater treatment system, as shown in the following embodiments.

[0039] This embodiment provides a wastewater treatment system for sand and gravel processing, such as Figures 1-4 As shown, it includes:

[0040] Wastewater tank 100, wherein an inlet pipe 110 and an outlet pipe 120 are provided on the wastewater tank 100. A first detection unit 111 for detecting the inlet pipe flow rate and turbidity is provided on the inlet pipe 110, and a second detection unit for detecting the outlet pipe flow rate and turbidity is provided on the outlet pipe 120.

[0041] A dosing tank 200 is connected to a wastewater tank 100 via a dosing pipe 230. A dosing pump 231 is installed on the dosing pipe 230. The dosing tank 200 is equipped with a third detection unit 201, a fourth detection unit 202, a mixing chamber 220, and a premixing chamber 210. The third detection unit 201 and the fourth detection unit 202 are used for liquid level detection in the dosing tank 200. The fourth detection unit 202 is located above the third detection unit 201. The connection between the dosing pipe 230 and the dosing tank 200 is located at the third detection unit. Below unit 201, the premixing chamber 210 is used to store the drug solution. The concentration of the drug solution in the premixing chamber 210 is higher than that in the dosing tank 200. The premixing chamber 210 is connected to the top of the mixing chamber 220 through the drain branch pipe 211. The top of the mixing chamber 220 is connected to the clear water pipe 240. A first control valve 243 is provided on the clear water pipe 240. A second control valve 213 is provided on the drain branch pipe 211. Multiple baffles 221 are provided in the mixing chamber 220. The bottom of the mixing chamber 220 is connected to the dosing tank 200.

[0042] The control module is connected to the first detection unit 111, the second detection unit, the third detection unit 201, the fourth detection unit 202, and the dosing pump 231. The control module is configured to: determine the dosage of the dosing pump 231 based on the detection signals of the first detection unit 111 and the second detection unit to match the dosage with the wastewater treatment requirements; and determine the opening degree of the first control valve 243 and the second control valve 213 based on the detection signals of the third detection unit 201 and the fourth detection unit 202 to achieve quantitative replenishment of the chemical solution in the dosing tank 200.

[0043] During operation, the concentration of the chemical solution in the dosing tank 200 is constant. The flow rate and turbidity of the inlet pipe 110 are acquired through the first detection unit 111, and the flow rate and turbidity of the outlet pipe 120 are acquired through the second detection unit. The flow rate change in the wastewater tank 100 is determined based on the flow rates of the inlet and outlet pipes 110, and the turbidity change in the wastewater tank 100 is determined based on the turbidity of the inlet and outlet pipes 120. The current dosage of chemicals from the dosing tank 200 to the wastewater tank 100 is obtained. Based on the changes in flow rate and turbidity within the wastewater tank 100, the operating status of the dosing pump 231 is controlled to adjust the dosage. Figure 8As shown; for example, when a decrease in flow rate is detected in the sewage tank 100, the dosing pump 231 is controlled to reduce the dosing amount proportionally; when an increase in flow rate is detected in the sewage tank 100, the dosing pump 231 is controlled to increase the dosing amount proportionally. In another example, when a decrease in turbidity is detected in the sewage tank 100, the dosing pump 231 is controlled to reduce the dosing amount; when an increase in turbidity is detected in the sewage tank 100, the dosing pump 231 is controlled to increase the dosing amount, so that the dosing amount matches the wastewater treatment demand, and the turbidity of the wastewater flowing out of the effluent pipe 120 is reduced to a preset value, improving... High chemical utilization rate ensures the stability of wastewater treatment in sand and gravel processing. When the third detection unit 201 detects that the chemical solution in the dosing tank 200 is at a low level and needs to be replenished, on the one hand, the residual chemical solution in the dosing tank 200 can still be continuously added to the wastewater tank 100 in conjunction with the dosing pump 231. On the other hand, the first control valve 243 and the second control valve 213 are opened, and the opening degree of the first control valve 243 and the second control valve 213 is controlled. Since the premixing chamber 210 contains a high-concentration chemical solution of a preset concentration, the premixing chamber 210 discharges... A high-concentration drug solution is introduced into the mixing chamber 220 via the liquid branch pipe 211, while clean water is introduced into the mixing chamber 220 via the clear water pipe 240. The two solutions undergo multiple downward flow reductions due to gravity within the mixing chamber 220, achieving uniform mixing without power. Simultaneously, by rationally controlling the opening of the first control valve 243 and the second control valve 213, the flow rates of the high-concentration drug solution and the clear water are maintained at a preset ratio. This ensures that the diluted drug solution after passing through the mixing chamber maintains a stable preset concentration, which is exactly the same as the concentration of the residual drug solution in the dosing tank 200, thereby enabling rapid dosing of the drug in the dosing tank. The chemical solution in the dosing tank 200 is replenished without the need for stirring or mixing within the tank, thus ensuring uninterrupted dosing of chemicals from the dosing tank 200 to the wastewater tank 100. This allows for continuous replenishment of the dosing tank 200 under operating conditions, eliminating the need to shut down either the dosing tank 200 or the wastewater tank 100. This enables continuous and automated dosing from one dosing tank 200 in conjunction with the wastewater tank 100. Furthermore, the chemical solution is uniformly mixed without power through the mixing chamber 220, effectively reducing the production, operating, and maintenance costs of the sand and gravel processing wastewater treatment system.

[0044] In addition, when replenishing the dosing tank 200, the fourth detection unit 202 detects whether the liquid level in the dosing tank 200 is at a high level. When the liquid level is reached, the replenishment work can be stopped and the first control valve 243 and the second control valve 213 can be closed.

[0045] In some embodiments, to achieve rapid, stable, and automated preparation of high-concentration drug solutions in the premixing chamber 210, such as... Figures 2-4As shown, the clean water pipe 240 can be connected to the top of the mixing chamber 220 via a first branch pipe 241. The first control valve 243 is installed on the first branch pipe 241. The clean water pipe 240 is connected to the premixing chamber 210 via a second branch pipe 242. A third control valve 244 is installed on the second branch pipe 242. An overflow pipe 212 is installed on the premixing chamber 210. The overflow pipe 212 is connected to the drain branch pipe 211 via a second control valve 213. The second control valve 213 is a three-way valve. The three-way valve has three states: a first state, a second state, and a third state. In the first state, the overflow pipe 212 is connected to the mixing chamber 220 via the drain branch pipe 211. In the second state, the premixing chamber 210 is directly connected to the mixing chamber 220 via the drain branch pipe 211. In the third state, the drain branch pipe 211 is closed, and the premixing chamber 210 cannot be connected to the mixing chamber 220 via the drain branch pipe 211. A fifth detection unit 214 is installed on the drain branch pipe 211. The fifth detection unit 214 is used to detect the flow rate of the drain branch pipe 211. The fifth detection unit 214 is located between the second control valve 213 and the mixing chamber 220. During operation, after the high-concentration drug solution in the premixing chamber 210 is used up, the third control valve 244 is opened, and the second control valve 213 is in the first state (the overflow pipe 212 is connected to the mixing chamber 220 through the drain branch pipe 211). Clean water is introduced into the premixing chamber 210 through the clean water pipe 240 and the second branch pipe 242. When the clean water level in the premixing chamber 210 rises to the overflow pipe 212, the clean water will flow through the overflow pipe 212, through the drain branch pipe 211, and into the mixing chamber 220. At this time, the fifth detection unit 214 detects the flow rate. Upon receiving the corresponding signal, the third control valve 244 is immediately closed. When the fifth detection unit 214 detects that the flow rate is zero, the second control valve 213 is controlled to be in the third state (drainage branch pipe 211 is closed). At this time, a certain amount of clean water is retained in the premixing chamber 210. Then, a certain amount of reagent is added to the premixing chamber 210 and stirred and mixed evenly to obtain a high-concentration drug solution of the preset concentration. This achieves almost automated operation of the high-concentration drug solution replenishment process, with high reproducibility, stable operation, effectively reducing maintenance costs, and improving system operation stability.

[0046] Specifically, in order to achieve rapid, stable, and automated configuration of high-concentration drug solution in the premixing chamber 210, the control module can be configured to: determine the opening degree of the second control valve 213 and the third control valve 244 based on the detection signal of the fifth detection unit 214, so as to achieve quantitative water solubility of the drug in the premixing chamber.

[0047] In some embodiments, to achieve quantitative replenishment of the drug solution in the dosing tank 200, a sixth detection unit 222 can be provided at the outlet of the mixing chamber 220. The sixth detection unit 222 is used to detect the flow rate at the outlet of the mixing chamber 220. The control module is also configured to determine the opening degree of the first control valve 243 and the second control valve 213 based on the detection signals of the fifth detection unit 214 and the sixth detection unit 222, so as to achieve replenishment of the mixing chamber 220 with a stable concentration of drug solution to the dosing tank 200. Preferably, the premixing chamber 210 is located above the mixing chamber 220 along the direction of gravity. Based on the above structure, when replenishing the dosing tank 200, since the concentration and volume of the high-concentration solution in the premixing chamber 210 are constant (the volume of the high-concentration solution is denoted as V1), it is only necessary to control the volume of clean water flowing into the mixing chamber 220 through the first branch pipe 241 to control the concentration and volume of the newly replenished solution entering the dosing tank 200 through the mixing chamber 220. That is, the total volume of clean water flowing into the mixing chamber 220 through the first branch pipe 241 is constant (denoted as V2). On the other hand, since the volume of the high-concentration solution in the premixing chamber 210 is small and it flows into the mixing chamber due to gravity, the flow rate of the high-concentration solution fluctuates greatly. To avoid the flow rate fluctuation of the high-concentration solution affecting the concentration of the newly replenished solution flowing out of the mixing chamber 220, the high-concentration solution is detected by the fifth detection unit 214. The flow rate Q1 of the liquid medicine flowing into the mixing chamber 220 and the flow rate Q2 of the newly replenished liquid medicine flowing out of the mixing chamber 220 detected by the sixth detection unit 222 are controlled by the opening of the first control valve 243 to keep the ratio of flow rate Q1 and flow rate Q2 constant. This allows the flow rate of clean water entering the mixing chamber 220 through the first branch pipe 241 to adapt to the change in the flow rate of the high-concentration liquid medicine entering the mixing chamber 220, and to keep the total volume of clean water entering the mixing chamber 220 through the first branch pipe 241 constant (V2). This ensures that the concentration of the newly replenished liquid medicine obtained after uniform mixing in the mixing chamber 220 remains constant, and that the total volume of the new liquid medicine medicine added to the dosing tank 200 each time is also constant. This facilitates the management and planning of consumables such as medicines, and improves the stability and convenience of system operation.

[0048] Preferably, the first control valve 243 is configured as a control valve with flow monitoring function to monitor the flow rate and cumulative volume of clean water entering the mixing chamber 220 from the first branch pipe 241. The first control valve 243 cooperates with the sixth detection unit 222 to perform mutual verification and reduce errors. The first control valve 243 can also cooperate with the fifth detection unit 214 to control the opening degree of the second control valve 213 and the first control valve 243 based on the monitoring data of the two, so that the ratio of flow rate Q1 to flow rate Q2 is kept constant, reducing control errors and ensuring that the concentration of the newly replenished medicine flowing out of the mixing chamber 220 remains stable.

[0049] It should be noted that the first, second, third, fourth, fifth, and sixth detection units are all existing technologies and can be implemented using existing flow sensors and turbidity sensors, which will not be elaborated upon here. The control module is also existing technology and can specifically be a chip, which will not be elaborated upon here.

[0050] Specifically, to achieve rapid preparation of high-concentration drug solution in the premixing chamber 210, a stirring mechanism 216 and a dosing port 215 can be installed on the premixing chamber 210. The dosing port 215 is used to add the drug into the premixing chamber 210, and the stirring mechanism 216 is used to stir and mix the water and the drug in the premixing chamber 210. The stirring mechanism 216 is existing technology, and can be a motor-driven stirring paddle to stir and mix the water and the drug in the premixing chamber 210, which will not be elaborated here. The drug is quantitatively added into the premixing chamber 210 through the dosing port 215. The method of drug addition is existing technology, which can be manual or automatic (such as a screw pump), which will not be elaborated here.

[0051] In some embodiments, to shorten the preparation time of the high-concentration drug solution in the premixing chamber 210, a heating unit 217 can be installed in the premixing chamber 210. The heating unit 217 is used to heat the water in the premixing chamber 210. By increasing the temperature of the water in the premixing chamber 210, the water dissolution rate of the drug in the premixing chamber 210 can be accelerated, shortening the preparation time of the high-concentration drug solution. Simultaneously, after being heated by the heating unit 217, the temperature of the high-concentration drug solution in the premixing chamber 210 is higher than the temperature of the water in the water pipe 240, creating a temperature difference. Under the influence of this temperature difference, when the high-concentration drug solution and water undergo multiple zigzag mixing processes in the mixing chamber 220, the diffusion between the high-concentration drug solution and water can be accelerated, further improving the mixing effect of the high-concentration drug solution and water, and improving the concentration stability of the newly added drug solution obtained after uniform mixing in the mixing chamber 220. The heating unit 217 is prior art and can specifically be a heating coil, which will not be elaborated here.

[0052] In some embodiments, due to the low liquid level in the dosing tank 200, newly added pesticide solution can easily cause liquid level fluctuations, affecting the stability of pesticide introduction through the inlet port of the dosing pipe 230 in the dosing tank 200. In severe cases, this can lead to deviations in the dosing accuracy of the dosing pump 231. To avoid the impact of newly added pesticide solution on the dosing control accuracy, an upper baffle 250 and a lower baffle 260 can be provided in the dosing tank 200, such as... Figure 5As shown, there is a first flow gap between the upper partition 250 and the inner wall of the dosing tank 200, and a second flow gap between the upper partition 250 and the lower partition 260. The upper partition 250 is located above the lower partition 260. A through hole 261 is provided on the lower partition 260. The liquid in the dosing tank can flow into the dosing pipe 230 through the first flow gap, the second flow gap, and the through hole. The third detection unit 201 is located between the upper partition 250 and the lower partition 260, and the outlet of the mixing chamber 220 corresponds to the upper partition 250. The upper baffle 250 and the lower baffle 260 work together to slow down the diffusion of newly added medicine and residual medicine in the dosing tank 200. At the same time, the medicine flowing out of the mixing chamber 220 through the upper baffle 250 reduces the impact of the newly introduced medicine on the residual medicine, thereby ensuring the stability of the liquid level in the dosing tank 200 when adding medicine, ensuring that the dosing pump 231 stably delivers medicine to the sewage tank 100, realizing precise dosing control during the replenishment process, and improving the system control accuracy and operational stability.

[0053] In some embodiments, to further improve the control accuracy of the dosage during the replenishment stage, a counterweight float 270 can be installed in the dosing tank 200. The counterweight float 270 can be a plate with an air bladder, an air bladder, or a foam board. The counterweight float 270 is located below the upper partition 250, and a sliding cylinder 271 corresponding to the through hole 261 is provided on the counterweight float 270. The sliding cylinder 271 has a sliding stroke along the direction of gravity. When the liquid in the dosing tank 200 is at a preset water level, such as... Figure 6 As shown, the buoyancy and gravity of the counterweight float 270 are balanced, the sliding cylinder 271 is located inside the through hole 261, and the preset water level is above the third detection unit 201 and is set close to the third detection unit 201; when the liquid in the dosing tank 200 is above the preset water level, as... Figure 7As shown, there is a preset gap between the sliding cylinder 271 and the lower baffle 260 so that the liquid can flow on both sides of the lower baffle 260; when the liquid in the dosing tank 200 is below the preset water level, the sliding cylinder 271 still has space to slide downward as the liquid level drops. When the liquid level in the dosing tank 200 is above the preset water level, the liquid can flow through the through hole 261 on both sides of the lower baffle 260. When the liquid level in the dosing tank 200 drops to the preset water level, the sliding cylinder 271 and the inner wall of the through hole 261 cooperate to reduce or block the flow cross-sectional area of ​​the liquid on both sides of the lower baffle 260, so that a relatively independent residual liquid area is formed below the lower baffle 260. The residual liquid area provides a stable liquid supply environment for the dosing pump 231. The counterweight float 270 decreases in adaptability as the liquid in the residual liquid area is removed, so that the dosing pump 231 is not affected or is almost unaffected by the subsequent replenishment of liquid into the dosing tank 200. In addition, when replenishing the dosing tank 200, after the liquid level in the dosing tank 200 is replenished to above the preset water level, the sliding cylinder 271 slides out of the through hole 261, and the liquid on both sides of the lower baffle 260 resumes flow through the through hole 261.

[0054] In some embodiments, the counterweight float 270 can be slidably connected to the upper partition 250 via a guide rod 272 to enable the sliding cylinder 271 to have a sliding stroke along the direction of gravity. A limit block 273 is provided on the guide rod 272, and the limit block 273 is located above the upper partition 250. The limit block 273 and the upper partition 250 abut against each other to limit the lower limit of the downward sliding of the sliding cylinder 271. The counterweight float 270 and the upper partition 250 abut against each other to limit the upper limit of the upward sliding of the sliding cylinder 271. The upper partition 250 is fixedly connected to the lower partition 260 via a support member 251.

[0055] In some embodiments, to reduce the impact of newly added medicine on the residual medicine, the input port of the dosing tube 230 can be located below the lower partition 260, preferably the input port of the dosing tube 230 is misaligned with the through hole 261.

[0056] This embodiment provides a method for treating wastewater from sand and gravel processing, based on the wastewater treatment system for sand and gravel processing described in the above embodiment.

[0057] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A wastewater treatment system for sand and gravel processing, characterized in that, include: A wastewater tank is provided with an inlet pipe and an outlet pipe. The inlet pipe is equipped with a first detection unit for detecting the inlet flow rate and turbidity, and the outlet pipe is equipped with a second detection unit for detecting the outlet flow rate and turbidity. The dosing tank is connected to the sewage tank via a dosing pipe. A dosing pump is installed on the dosing pipe. The dosing tank is equipped with a third detection unit, a fourth detection unit, a mixing chamber, and a premixing chamber. The third and fourth detection units are used for liquid level detection in the dosing tank. The fourth detection unit is located above the third detection unit. The connection between the dosing pipe and the dosing tank is located below the third detection unit. The premixing chamber is used to store the drug solution. The concentration of the drug solution in the premixing chamber is higher than the concentration of the drug solution in the dosing tank. The premixing chamber is connected to the top of the mixing chamber via a drain branch pipe. The top of the mixing chamber is connected to a clean water pipe. A first control valve is installed on the clean water pipe. A second control valve is installed on the drain branch pipe. Multiple baffles are installed in the mixing chamber. The bottom of the mixing chamber is connected to the dosing tank. The control module is connected to the first detection unit, the second detection unit, the third detection unit, the fourth detection unit, and the dosing pump. The control module is configured to: determine the dosage of the dosing pump based on the detection signals of the first and second detection units to match the dosage with the wastewater treatment requirements; and determine the opening degree of the first and second control valves based on the detection signals of the third and fourth detection units to achieve quantitative replenishment of the chemical solution in the dosing tank and ensure that the concentration of the liquid exiting the mixing chamber is the same as the concentration of the residual chemical solution in the dosing tank.

2. The sand and gravel processing wastewater treatment system according to claim 1, characterized in that, The clean water pipe is connected to the top of the mixing chamber through the first branch pipe. The first control valve is installed on the first branch pipe. The clean water pipe is connected to the premixing chamber through the second branch pipe. A third control valve is installed on the second branch pipe. An overflow pipe is installed on the premixing chamber. The overflow pipe is connected to the drain branch pipe through the second control valve. The second control valve is a three-way valve.

3. The sand and gravel processing wastewater treatment system according to claim 2, characterized in that, A fifth detection unit is provided on the drain branch pipe. The fifth detection unit is used to detect the flow rate of the drain branch pipe. The fifth detection unit is located between the second control valve and the mixing chamber.

4. The sand and gravel processing wastewater treatment system according to claim 3, characterized in that, The control module is also configured to: determine the opening degree of the second control valve and the third control valve based on the detection signal of the fifth detection unit, so as to achieve quantitative water solubility of the premixed indoor agent.

5. The sand and gravel processing wastewater treatment system according to claim 4, characterized in that, The outlet of the mixing chamber is equipped with a sixth detection unit, which is used to detect the flow rate of the outlet of the mixing chamber. The control module is also configured to: determine the opening degree of the first control valve and the second control valve based on the detection signals of the fifth detection unit and the sixth detection unit, so as to realize the mixing chamber to replenish the dosing tank with a stable concentration of drug solution. And / or, along the direction of gravity, the premixing chamber is located above the mixing chamber.

6. A sand and gravel processing wastewater treatment system according to any one of claims 1 to 5, characterized in that, The premixing chamber is equipped with a stirring mechanism and a dosing port. The dosing port is used to add chemicals into the premixing chamber, and the stirring mechanism is used to stir and mix the water and chemicals in the premixing chamber. And / or, the premixing chamber is provided with a heating unit, which is used to heat the clean water in the premixing chamber.

7. A wastewater treatment system for sand and gravel processing according to any one of claims 1 to 5, characterized in that, The dosing tank is provided with an upper baffle and a lower baffle. There is a first flow gap between the upper baffle and the inner wall of the dosing tank, and a second flow gap between the upper baffle and the lower baffle. The upper baffle is located above the lower baffle. The lower baffle is provided with a through hole. The third detection unit is located between the upper baffle and the lower baffle. The outlet of the mixing chamber corresponds to the upper baffle.

8. The sand and gravel processing wastewater treatment system according to claim 7, characterized in that, A counterweight float is installed in the dosing tank, located below the upper baffle. A sliding cylinder corresponding to the through hole is installed on the counterweight float, and the sliding cylinder has a sliding stroke along the direction of gravity. When the liquid in the dosing tank is at a preset water level, the buoyancy and gravity of the counterweight float are balanced, and the sliding cylinder is in the through hole. The preset water level is above the third detection unit and is set close to the third detection unit. When the liquid in the dosing tank is above the preset water level, there is a preset gap between the sliding cylinder and the lower baffle.

9. A wastewater treatment system for sand and gravel processing according to claim 8, characterized in that, The counterweight float is slidably connected to the upper partition via a guide rod to enable the sliding cylinder to have a sliding stroke along the direction of gravity. A limit block is provided on the guide rod, and the limit block is located above the upper partition. And / or, the input port of the dosing tube is located below the lower partition.

10. A method for treating wastewater from sand and gravel processing, characterized in that, Wastewater from sand and gravel processing is treated using the wastewater treatment system described in any one of claims 1 to 9.

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