A carrier supply calculation method and carrier supply system for sewage treatment

Abstract

The application discloses a carrier supplement calculation method and a carrier supplement system for sewage treatment, and comprises the following steps: S1, acquiring a first actual carrier density of a coagulation tank and a second actual carrier density of a flocculation tank; S2, calculating a carrier loss amount according to the first actual carrier density and the second actual carrier density based on a preset carrier density range; S3, acquiring a sludge level of a sedimentation tank, and determining a target sludge volume pumped from the sedimentation tank according to the carrier loss amount and the sludge level; S4, pumping sludge in the sedimentation tank according to the target sludge volume, and determining the type and quantity of open cyclones based on a front-end pressure of the cyclone and a maximum working capacity of the cyclone; S5, acquiring sludge flow rates of front ends of the open cyclones, and calculating a first carrier amount returned to the flocculation tank according to the sludge flow rates by using a formula one; and S6, calculating a second carrier amount added to the flocculation tank by using a formula two, and returning to S1, so that the continuity of carrier supplement and the carrier recovery efficiency are ensured.

Description

Technical Field

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

[0002] Currently, wastewater treatment systems suffer from problems such as mixed connections and misaligned pipe networks, easily leading to overflow pollution from combined sewer overflows and subsequent water pollution. Among numerous solutions, decentralized wastewater treatment is an important approach. Combined sewer overflow (CSO) treatment plants and equipment are typically used to manage water pollution caused by overflows. Overflow pollution is characterized by large fluctuations in water quality and quantity, poor stability, and strong randomness. When treating overflow polluted water bodies or co-treating rainwater and wastewater from wastewater treatment plants, the problem of massive instantaneous overflow volumes and drastic changes in influent water quality arises. Therefore, overflow treatment requires a large treatment load and efficiency within a limited land area. Flocculation and sedimentation, with their small footprint and high load capacity, are widely used in the aforementioned overflow treatment scenarios. Currently, traditional processes have low treatment efficiency and low load, requiring the addition of high-density, harmless carriers to enhance flocculation and sedimentation reaction capabilities, thereby improving flocculation effects and shortening sedimentation time. However, relying on the addition of external carriers does not meet the requirements of sustainability and stability.

[0003] Patent CN112321020 discloses a high-efficiency pretreatment system for circulating wastewater. An automatic sludge discharge valve is installed at the bottom of the high-efficiency clarifier. Part of the sludge discharged from the high-efficiency clarifier is returned to the inlet header of the enhanced flocculation tank via a sludge circulation pump, while the remaining sludge is transported to the sludge deflocculation machine of the sludge deflocculation system via a residual sludge pump. The sludge deflocculation system is connected to a heavy media flocculant separator, which includes a flocculant separator and a flocculant conveyor. The flocculant separator separates the heavy media flocculants and sludge, and the separated flocculants are sent to the enhanced flocculation tank via the flocculant conveyor. Patent CN108328811 discloses a wastewater treatment method and apparatus for recyclable microsand. Sludge is pumped into a hydrocyclone for sludge-sand separation, and the separated microsand is recycled back into the flocculation tank.

[0004] The aforementioned system discloses the basic structural components of a wastewater treatment system that utilizes recycled media, as well as the separation method for separating sludge and recycled media. However, it does not disclose how to efficiently recover and add media based on the overall operation of the wastewater treatment system to ensure efficient and stable operation of the system. It cannot effectively cope with drastic changes in overflow water quality and still suffers from low equipment operating efficiency and poor overflow pollution control.

[0005] In view of the above technical problems, this invention is hereby introduced. Summary of the Invention

[0006] The first objective of this invention is to propose a carrier replenishment calculation method for wastewater treatment, which adapts to fluctuations in water quality and quantity during the wastewater treatment process, ensures the continuity of carrier replenishment and carrier recovery efficiency through linkage control, reduces carrier loss rate, and guarantees efficient operation of wastewater treatment.

[0007] The second objective of this invention is to provide a carrier replenishment system for wastewater treatment.

[0008] To achieve the above objectives, the first aspect of this invention proposes a carrier replenishment calculation method for wastewater treatment, comprising:

[0009] S1, obtain the first actual carrier density of the coagulation tank and the second actual carrier density of the flocculation tank;

[0010] S2, based on a preset carrier density range, calculate the carrier missing amount according to the first actual carrier density and the second actual carrier density;

[0011] S3, obtain the sludge level height in the sedimentation tank, and determine the target sediment volume to be pumped from the sedimentation tank based on the carrier loss and sludge level height;

[0012] S4. Based on the target sediment volume, the sediment in the sedimentation tank is pumped out, and based on the pressure at the front end of the hydrocyclone and the maximum working capacity of the hydrocyclone, the type and number of hydrocyclones to be turned on are determined.

[0013] S5, obtain the sediment flow rate at the front end of each activated hydrocyclone, and calculate the first carrier volume returned to the flocculation tank based on the sediment flow rate using Formula 1. Formula 1: Where Mz represents the first carrier quantity, d represents the proportion of carrier in the slurry, ρ3 represents the carrier density in the sedimentation tank, and q i η represents the sediment flow rate at the front end of the i-th activated hydrocyclone. i This represents the carrier separation efficiency corresponding to the i-th activated hydrocyclone, and n represents the number of activated hydrocyclones.

[0014] S6, calculate the amount of the second carrier added to the flocculation tank using Formula 2, and return to S1. Formula 2: Ms = ρ r V2-ρ1V1-ρ2V2-Mz, where Ms represents the second carrier quantity, ρ r V1 represents the maximum carrier density corresponding to the influent turbidity within the preset carrier density range, V2 represents the volume of the flocculation tank, ρ1 represents the solid density of the coagulation tank, and Mz represents the first carrier quantity.

[0015] Furthermore, S3 includes:

[0016] S31, obtain the mud level height of each mud hopper in the sedimentation tank;

[0017] S32, determine whether the mud level in the mud hopper is lower than the preset mud level;

[0018] S33, if the mud level in any mud hopper is greater than or equal to the preset mud level, then the volume of the first sediment transported to the hydrocyclone is calculated using Formula 3 based on the carrier loss. Formula 3: Where Qr represents the volume of the first sediment, Ma represents the amount of carrier missing, d represents the proportion of carrier in the mud-water mixture, and ρ3 represents the carrier density in the sedimentation tank.

[0019] S34, Based on the volume of the first precipitate, calculate the volume of the second precipitate from the sedimentation tank using Formula 4. Formula 4: Where Qn represents the volume of the second precipitate, Qr represents the volume of the first precipitate, and a represents the mud-water circulation ratio parameter.

[0020] Furthermore, S3 also includes:

[0021] S35, determine the actual volume of sediment in the sedimentation tank based on the mud level height in each mud hopper;

[0022] S36, Determine whether the actual precipitate volume is greater than or equal to the second precipitate volume;

[0023] S37, if the actual precipitate volume is greater than or equal to the second precipitate volume, then the second precipitate volume is determined as the target precipitate volume, and the first precipitate volume is determined as the intermediate precipitate volume.

[0024] Furthermore, S3 also includes:

[0025] S38, If the actual precipitate volume is less than the second precipitate volume, then the actual precipitate volume is determined as the target precipitate volume, and the intermediate precipitate volume corresponding to the actual precipitate volume is calculated using Formula 5. Formula 5: Where Qk represents the intermediate precipitate volume corresponding to the actual precipitate volume, Qe represents the actual precipitate volume, and the intermediate precipitate volume corresponding to the actual precipitate volume is defined as the intermediate precipitate volume.

[0026] Furthermore, S4 includes:

[0027] S41, Based on the target sediment volume and the intermediate sediment volume, determine the type and number of centrifugal sludge pumps to be activated, so that the ratio of the target sediment volume to the intermediate sediment volume meets the following requirements. Where 'a' represents the mud-water circulation ratio parameter;

[0028] S42, obtain the pressure value at the front end of the hydrocyclone, and start the hydrocyclone according to the pressure value and the maximum working capacity of the hydrocyclone.

[0029] Furthermore, S3 also includes:

[0030] S39, if the mud level in the mud hopper is lower than the preset mud level, the sediment that is not drawn from the sedimentation tank will enter S6.

[0031] By applying the technical solutions in the above embodiments of the present invention, the following technical effects are achieved:

[0032] 1. This method ensures the continuity of carrier replenishment and carrier recovery efficiency through linkage control, reduces carrier loss rate, and guarantees the efficient operation of wastewater treatment.

[0033] 2. This method uses real-time data monitoring to match the pressure value at the front end of the hydrocyclone with the pressure value in its own operating parameters, and matches the sediment flow rate at the front end with its own maximum processing capacity, automatically switching the activated hydrocyclone to make the hydrocyclone work efficiently, thereby achieving better separation effect and improving the carrier recovery efficiency.

[0034] 3. This method quickly and conveniently calculates the amount of the first carrier returned to the flocculation tank by acquiring the sediment flow rate at the front end of each activated hydrocyclone in real time. This increases the weight of the flocs produced by flocculation, improves the sedimentation rate, shortens the flocculation reaction time, and improves the removal effect of pollutants, thus realizing the sustainable circulation of the carrier.

[0035] 4. This method improves the efficiency and quality of wastewater treatment by adding a second carrier to the flocculation tank to maintain the carrier density in the flocculation tank within a preset carrier density range, thereby improving the efficiency and quality of wastewater treatment through the efficient cooperation of the carrier.

[0036] To achieve the above objectives, a second aspect of the present invention provides a carrier replenishment system for wastewater treatment, comprising: a coagulation tank, a flocculation tank, a sedimentation tank, a sludge tank, a carrier recovery system, and a carrier control system.

[0037] The coagulation tank, flocculation tank, and sedimentation tank are connected in sequence.

[0038] The carrier recovery system includes at least one centrifugal sludge suction pump and multiple hydrocyclones. The input end of each centrifugal sludge suction pump is connected to the sedimentation tank, and the output end of each centrifugal sludge suction pump is connected to the input end of at least one hydrocyclone. The output end of the hydrocyclone is connected to the flocculation tank and the sludge tank.

[0039] The carrier control system is connected to the coagulation tank, flocculation tank, sedimentation tank and carrier recovery system respectively, and uses the carrier replenishment calculation method for wastewater treatment.

[0040] Furthermore, the system also includes: densitometers installed in the coagulation tank and flocculation tank, sludge level gauges installed in the sedimentation tank, and pressure gauges and flow meters installed at the front end of each hydrocyclone, used to monitor the operating data of the carrier supply system and feed it back to the carrier control system.

[0041] Furthermore, the system also includes a carrier addition system, which is connected to the carrier control system and is also connected to the flocculation tank, for adding the second carrier to the flocculation tank.

[0042] Furthermore, the system also includes a slurry shear machine, the input end of which is connected to a centrifugal slurry pump, and the output end of which is connected to a hydrocyclone to disperse the sediment pumped by the centrifugal slurry pump and transport the dispersed sediment to the hydrocyclone.

[0043] By applying the technical solutions in the above embodiments of the present invention, the following technical effects are achieved:

[0044] 1. This system can adapt to fluctuations in water quality and quantity during the wastewater treatment process and automatically replenish the carrier, keeping the carrier density in the flocculation tank within the preset range. This improves the sedimentation rate, shortens the flocculation reaction time, and enhances the removal efficiency of pollutants, ensuring the efficient operation of wastewater treatment.

[0045] 2. This system uses a centrifugal sludge pump in conjunction with a hydrocyclone to efficiently separate the carrier in the sediment and circulate it back into the flocculation tank, thus reducing the carrier loss rate.

[0046] 3. This system can monitor the operating data of the carrier replenishment system and feed it back to the carrier control system, so as to carry out rapid and accurate carrier replenishment operations in the sewage treatment process by cooperating with the carrier control system through real-time monitoring of operating data.

[0047] 4. This system effectively mixes sewage and solid waste in the sediment pumped by the centrifugal sludge pump into slurry through a sludge shear machine, which enables the hydrocyclone to separate the carrier more quickly and thoroughly, thus improving the overall carrier separation efficiency.

[0048] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0049] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0050] Figure 1 A schematic diagram of the structure of a wastewater treatment system according to one embodiment is shown;

[0051] Figure 2 A schematic diagram of the structure of a wastewater treatment system according to one embodiment is shown;

[0052] Figure 3 A schematic diagram of the structure of a wastewater treatment system according to one embodiment is shown;

[0053] Figure 4 A schematic diagram of the structure of a wastewater treatment system according to one embodiment is shown;

[0054] Figure 5 A schematic diagram of the structure of a wastewater treatment system according to one embodiment is shown;

[0055] Figure 6 A schematic diagram of the structure of a wastewater treatment system according to one embodiment is shown;

[0056] Figure 7 A flowchart of a wastewater treatment method according to one embodiment is presented.

[0057] Reference numerals: 110, coagulation tank; 120, flocculation tank; 130, sedimentation tank; 140, sludge tank; 150, carrier recovery system; 151, centrifugal sludge suction pump; 152, hydrocyclone; 153, sludge shear machine; 160, carrier control system; 170, densitometer; 180, sludge level gauge; 190, pressure gauge; 210, flow meter; 220, carrier dosing system; 230, frequency converter; 240, valve; 250, electrically controlled valve. Detailed Implementation

[0058] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] The present invention will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed by the present invention.

[0060] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0061] The carrier replenishment calculation method and carrier replenishment system for wastewater treatment according to embodiments of this application are described below with reference to the accompanying drawings.

[0062] Example 1

[0063] Figure 1 This is a flowchart of a carrier replenishment calculation method for wastewater treatment according to an embodiment of this application, which specifically includes the following steps:

[0064] S1, obtain the first actual carrier density of the coagulation tank and the second actual carrier density of the flocculation tank.

[0065] In one embodiment of the present invention, considering that the water quality and quantity of overflow pollution during the sewage treatment process fluctuate greatly, real-time monitoring can quickly, timely and accurately obtain the first actual carrier density of the coagulation tank and the second actual carrier density of the flocculation tank, thereby providing timely and accurate data support for subsequent carrier replenishment calculations.

[0066] S2, based on a preset carrier density range, calculate the carrier missing amount according to the first actual carrier density and the second actual carrier density.

[0067] It should be noted that the preset carrier density range is determined based on past wastewater operation data and on-site operational testing. Before wastewater treatment, on-site operational testing can be conducted, and the preset carrier density range can be obtained by integrating past wastewater operation data. Furthermore, during wastewater treatment, on-site operational testing can be carried out according to the wastewater treatment situation and work requirements, and the preset carrier density range can be updated by integrating past wastewater operation data. This ensures that the carrier density in the flocculation tank remains at a high level, thereby enhancing the flocculation effect, shortening the sedimentation time, and ultimately improving the wastewater treatment load and efficiency.

[0068] In one embodiment of the present invention, based on a preset carrier density range, and according to the first actual carrier density of the coagulation tank and the second actual carrier density of the flocculation tank obtained by real-time monitoring in S1, the carrier loss in the flocculation tank is calculated using the following formula: Ma = ρ r V2-ρ1V1-ρ2V2. Where Ma represents the amount of vector deletion, ρ... r V1 represents the maximum carrier density corresponding to the influent turbidity within the preset carrier density range, V2 represents the volume of the flocculation tank, and ρ1 represents the solid density of the coagulation tank. Therefore, the calculated carrier deficiency can be used as data support for subsequent carrier replenishment calculations.

[0069] S3, obtain the sludge level height in the sedimentation tank, and determine the target sediment volume to be pumped from the sedimentation tank based on the carrier loss and sludge level height.

[0070] In one embodiment of the present invention, such as Figure 2 As shown, S3 specifically includes the following steps:

[0071] S31, obtain the mud level height of each mud hopper in the sedimentation tank.

[0072] Specifically, by monitoring in real time, the mud level height of each mud hopper in the sedimentation tank can be obtained quickly and accurately, so as to provide timely and accurate data support for subsequent carrier replenishment calculations.

[0073] S32, determine whether the mud level in the mud hopper is lower than the preset mud level.

[0074] Specifically, it is determined that the mud level height of each mud hopper in the sedimentation tank obtained in S31 is all less than the preset mud level.

[0075] S33, if the mud level height of any mud hopper is greater than or equal to the preset mud level, then the volume of the first sediment transported to the hydrocyclone is calculated using Formula 3 based on the amount of carrier missing.

[0076] Specifically, formula three: Where Qr represents the volume of the first sediment, Ma represents the amount of carrier missing, d represents the proportion of carrier in the mud-water mixture, ρ3 represents the carrier density in the sedimentation tank, and 0.6≤d≤1.

[0077] It should be noted that the preset sludge level is determined based on a preset carrier density range, which avoids wasting computational and operational time costs due to the inability of the returned sediment to the flocculation tank to achieve accelerated flocculation and sedimentation. Specifically, when multiple sludge hoppers are set up in the sedimentation tank, the requirement for starting the suction of sediment from the sedimentation tank is met if the sludge level in any hopper is greater than or equal to the preset sludge level. Furthermore, Formula 3 can be used to quickly calculate the first sediment volume of sediment that needs to be transported to the hydrocyclone to replenish the carrier deficiency in S2 to the flocculation tank.

[0078] S34. Based on the volume of the first sediment, calculate the volume of the second sediment drawn from the sedimentation tank using Formula 4.

[0079] Specifically, Formula 4: Where Qn represents the volume of the second precipitate, Qr represents the volume of the first precipitate, and a represents the mud-water circulation ratio parameter, 1≤a≤2.

[0080] Specifically, based on the first sediment volume calculated by S32, the second sediment volume of sediment that needs to be drawn from the sedimentation tank to replenish the carrier missing in S2 to the flocculation tank can be quickly calculated using Formula 4.

[0081] The above process is based on the carrier loss calculated by S2, and the volume of sediment subsequently pumped out from the sedimentation tank is quickly and conveniently calculated using Formulas 3 and 4.

[0082] In another embodiment of the invention, such as Figure 3 As shown, S3 also includes:

[0083] S35, determine the actual volume of sediment in the sedimentation tank based on the mud level height in each mud hopper.

[0084] S36, determine whether the actual precipitate volume is greater than or equal to the second precipitate volume.

[0085] S37, if the actual precipitate volume is greater than or equal to the second precipitate volume, then the second precipitate volume is determined as the target precipitate volume, and the first precipitate volume is determined as the intermediate precipitate volume.

[0086] Specifically, if the actual sediment volume is greater than or equal to the second sediment volume, it means that the sediment volume in the sedimentation tank meets the requirement of the carrier deficiency for sediment volume. Therefore, the second sediment volume is determined as the target sediment volume, and the first sediment volume is determined as the intermediate sediment volume.

[0087] In addition, such as Figure 4 As shown, S3 also includes:

[0088] S38. If the actual precipitate volume is less than the second precipitate volume, the actual precipitate volume is determined as the target precipitate volume, and the intermediate precipitate volume corresponding to the actual precipitate volume is calculated using Formula 5.

[0089] Specifically, Formula 5: Where Qk represents the intermediate precipitate volume corresponding to the actual precipitate volume, Qe represents the actual precipitate volume, and the intermediate precipitate volume corresponding to the actual precipitate volume is defined as the intermediate precipitate volume.

[0090] The above process further confirms the volume of sediment subsequently drawn from the sedimentation tank by comparing the actual sediment volume in the sedimentation tank with the volume of the second sediment corresponding to the carrier deficiency in S2, thus ensuring the accuracy of the carrier replenishment calculation.

[0091] S4. Based on the target sediment volume, the sediment in the sedimentation tank is pumped out, and based on the pressure at the front end of the hydrocyclone and the maximum working capacity of the hydrocyclone, the type and number of hydrocyclones to be turned on are determined.

[0092] Specifically, such as Figure 5 As shown, S4 includes the following steps:

[0093] S41, Based on the target sediment volume and the intermediate sediment volume, determine the type and number of centrifugal sludge pumps to be activated, so that the ratio of the target sediment volume to the intermediate sediment volume meets the following requirements.

[0094] Where 'a' represents the mud-water circulation ratio parameter, and 1 ≤ a ≤ 2.

[0095] In one embodiment of the present invention, the ratio of the target sediment volume input to the centrifugal sludge pump to the intermediate sediment volume output to the centrifugal sludge pump satisfies the following condition: At that time, the size of the centrifugal sludge suction pump is set to meet the corresponding parameter requirements and to ensure stable recovery and replenishment of the carrier.

[0096] It should be noted that different types of centrifugal sludge suction pumps correspond to different processing frequencies. In a specific embodiment of the present invention, different types and numbers of centrifugal sludge suction pumps are installed in the sedimentation tank, and are correspondingly set in each sludge hopper according to different application scenarios. Therefore, after determining the target sediment volume to be pumped from the sedimentation tank in step S3 based on the carrier loss and sludge level, the type and number of centrifugal sludge suction pumps to be activated can be determined based on the target sediment volume and the intermediate sediment volume.

[0097] S42, obtain the pressure value at the front end of the hydrocyclone, and start the hydrocyclone according to the pressure value and the maximum working capacity of the hydrocyclone.

[0098] In one embodiment of the present invention, when the pressure value at the front end of each hydrocyclone is matched with the pressure value in its own operating parameters, and the precipitate flow rate at the front end is matched with its own maximum processing capacity, the hydrocyclone can work efficiently, thereby achieving a better separation effect and improving the recovery efficiency of the carrier.

[0099] S5: Obtain the sediment flow rate at the front end of each activated hydrocyclone, and calculate the first carrier volume returned to the flocculation tank based on the sediment flow rate using Formula 1.

[0100] Specifically, Formula 1: Where Mz represents the first carrier quantity, d represents the proportion of carrier in the slurry, ρ3 represents the carrier density in the sedimentation tank, and q i η represents the sediment flow rate at the front end of the i-th activated hydrocyclone. i Let η represent the carrier separation efficiency corresponding to the i-th activated hydrocyclone, and let η be the efficiency of the carrier separation efficiency. i ≥97%, where n represents the number of cyclones that are turned on.

[0101] The above process enables the real-time acquisition of sediment flow rates at the front ends of each activated hydrocyclone after sediment is drawn from the sedimentation tank in S4. This allows for the rapid and convenient calculation of the first carrier volume returned to the flocculation tank using Formula 1. This increases the weight of the flocs produced by flocculation, improves the sedimentation rate, shortens the flocculation reaction time, enhances the removal efficiency of pollutants, and achieves sustainable carrier circulation.

[0102] S6, calculate the amount of the second carrier added to the flocculation tank using Formula 2, and return to S1.

[0103] Specifically, Formula 2: Ms = ρ r V2-ρ1V1-ρ2V2-Mz. Where Ms represents the second carrier quantity, ρ r V1 represents the maximum carrier density corresponding to the influent turbidity within the preset carrier density range, V2 represents the volume of the flocculation tank, ρ1 represents the solid density of the coagulation tank, and Mz represents the first carrier quantity.

[0104] The above process can calculate the amount of the first carrier returned to the flocculation tank based on S5. By adding a second carrier to the flocculation tank, the carrier density in the flocculation tank is kept within the preset carrier density range, thereby improving the wastewater treatment efficiency and quality through the efficient cooperation of the carriers.

[0105] In yet another embodiment, such as Figure 6 As shown, S3 also includes:

[0106] S39, if the mud level in the mud hopper is lower than the preset mud level, the sediment that is not drawn from the sedimentation tank will enter S6.

[0107] In one embodiment of the present invention, during the start-up phase of wastewater treatment, if the sludge level in the sludge hopper of the sedimentation tank is lower than the preset sludge level, the sludge that is not drawn from the sedimentation tank needs to be added to the flocculation tank as a second carrier.

[0108] The above process avoids wasting calculation and operation time costs when the mud level in the mud hopper of the sedimentation tank is less than the preset mud level.

[0109] By applying the technical solutions in the above embodiments of the present invention, the following technical effects are achieved:

[0110] 1. This method ensures the continuity of carrier replenishment and carrier recovery efficiency through linkage control, reduces carrier loss rate, and guarantees the efficient operation of wastewater treatment.

[0111] 2. This method uses real-time data monitoring to match the pressure value at the front end of the hydrocyclone with the pressure value in its own operating parameters, and matches the sediment flow rate at the front end with its own maximum processing capacity, automatically switching the activated hydrocyclone to make the hydrocyclone work efficiently, thereby achieving better separation effect and improving the carrier recovery efficiency.

[0112] 3. This method quickly and conveniently calculates the amount of the first carrier returned to the flocculation tank by acquiring the sediment flow rate at the front end of each activated hydrocyclone in real time. This increases the weight of the flocs produced by flocculation, improves the sedimentation rate, shortens the flocculation reaction time, and improves the removal effect of pollutants, thus realizing the sustainable circulation of the carrier.

[0113] 4. This method improves the efficiency and quality of wastewater treatment by adding a second carrier to the flocculation tank to maintain the carrier density in the flocculation tank within a preset carrier density range, thereby improving the efficiency and quality of wastewater treatment through the efficient cooperation of the carrier.

[0114] Example 2

[0115] To facilitate the application of the above embodiments, the present invention also proposes a carrier replenishment system for wastewater treatment.

[0116] Figure 7 This is a schematic diagram of the carrier replenishment system for wastewater treatment according to an embodiment of the present invention.

[0117] This embodiment describes a carrier replenishment system for wastewater treatment (e.g., Figure 7 As shown in the figure, it is an important component of the wastewater treatment system. From a sustainability perspective, based on real-time monitoring of data such as carrier density, sludge level, liquid level and flow rate, it can adapt to fluctuations in water quality and quantity during the wastewater treatment process, and carry out efficient circulation and replenishment of the carrier in flocculation and sedimentation, thus ensuring the efficient operation of wastewater treatment.

[0118] In this embodiment, the application scenario is the coordinated treatment of overflow polluted water bodies and rainwater and sewage from wastewater treatment plants.

[0119] like Figure 7 As shown, the carrier replenishment system for wastewater treatment includes a coagulation tank 110, a flocculation tank 120, a sedimentation tank 130, a sludge tank 140, a carrier recovery system 150, and a carrier control system 160. The dashed lines represent control signals issued by the carrier control system 160, and the solid lines represent the operational logic between the various components.

[0120] In this embodiment, the coagulation tank 110, the flocculation tank 120, and the sedimentation tank 130 are connected in sequence. During the wastewater treatment process, the wastewater passes through the flow lines of the tank structure in sequence, and reacts with the drugs and carriers in the tank during the process. The flocs generated by the flocculation reaction are then carried into the sedimentation tank for sedimentation, thereby achieving wastewater purification.

[0121] like Figure 7As shown, in this embodiment, the carrier recovery system 150 includes at least one centrifugal sludge suction pump 151 and multiple hydrocyclones 152. The input end of each centrifugal sludge suction pump 151 is connected to the sedimentation tank 130, and the output end of each centrifugal sludge suction pump 151 is connected to the input end of at least one hydrocyclone 152. The output end of each hydrocyclone 152 is connected to the flocculation tank 120 and the sludge tank 140. Thus, the centrifugal sludge suction pump and the hydrocyclones work together to efficiently separate the carrier from the sediment and circulate it back into the flocculation tank 120 to reduce the carrier loss rate. Specifically, the carrier control system 160 controls the type and number of centrifugal sludge suction pumps 151 to be activated via a frequency converter 230 and a valve 240. Additionally, the carrier control system 160 controls the type and number of hydrocyclones 152 to be activated via an electrically controlled valve 250.

[0122] In addition, such as Figure 7 As shown, in this embodiment, the carrier control system 160 is connected to the coagulation tank 110, flocculation tank 120, sedimentation tank 130, and carrier recovery system 150, respectively, and uses a carrier replenishment calculation method for wastewater treatment. This ensures the continuity of carrier replenishment and carrier recovery efficiency through coordinated control, reduces carrier loss rate, and guarantees efficient operation of wastewater treatment. It should be noted that the carrier replenishment calculation method used by the carrier control system for wastewater treatment is consistent with that described in Embodiment 1, and therefore will not be repeated in this embodiment.

[0123] It should be noted that the carrier replenishment system in this embodiment can be used in conjunction with the chemical dosing system in wastewater treatment to keep the dosage of chemicals in the coagulation tank and flocculation tank at a low level, and the carrier replenishment system in this embodiment can be used in conjunction with the sludge disposal system to optimize sludge recycling.

[0124] Furthermore, such as Figure 7 As shown, the carrier replenishment system also includes: a density meter 170 installed in the coagulation tank and flocculation tank, a sludge level gauge 180 installed in the sedimentation tank, and a pressure gauge 190 and a flow meter 210 installed at the front end of each hydrocyclone. These are used to monitor the operating data of the carrier replenishment system and feed it back to the carrier control system 160, so as to coordinate with the carrier control system to perform rapid and accurate carrier replenishment operations during the wastewater treatment process through real-time monitoring of the operating data. The operating data includes the first actual carrier density in the coagulation tank, the second actual carrier density in the flocculation tank, the sludge level in the sedimentation tank, the pressure value at the front end of the hydrocyclone, and the sediment flow rate at the front end of each activated hydrocyclone.

[0125] Furthermore, such as Figure 7As shown, the carrier replenishment system also includes a carrier dosing system 220. Specifically, the carrier dosing system 220 is connected to the carrier control system 160 and is also connected to the flocculation tank 120. It is used to add the second carrier to the flocculation tank 120 according to the control signal from the carrier control system 160, so that the carrier density in the flocculation tank 120 is maintained within a preset carrier density range, thereby improving the wastewater treatment efficiency and quality through the efficient coordination of the carriers. Specifically, the carrier control system 160 controls the addition of the second carrier through a frequency converter 230 and a valve 240.

[0126] Furthermore, such as Figure 7 As shown, the carrier supply system also includes a slurry shear press 153. The input end of the slurry shear press 153 is connected to the centrifugal sludge pump 151, and the output end is connected to a hydrocyclone 152. This system is used to disperse the sediment pumped by the centrifugal sludge pump 151 and transport the dispersed sediment to the hydrocyclone 152. During the treatment process, the carrier acts as agglomerates mixed in the sediment. The slurry shear press disperses the sediment, allowing the hydrocyclone to separate the carrier more quickly and thoroughly, thus improving the carrier separation efficiency in the hydrocyclone. It should be noted that the type and number of slurry shear presses are matched to the type and number of centrifugal sludge pumps.

[0127] By applying the technical solutions in the above embodiments of the present invention, the following technical effects are achieved:

[0128] 1. This system can adapt to fluctuations in water quality and quantity during the wastewater treatment process and automatically replenish the carrier, keeping the carrier density in the flocculation tank within the preset range. This improves the sedimentation rate, shortens the flocculation reaction time, and enhances the removal efficiency of pollutants, ensuring the efficient operation of wastewater treatment.

[0129] 2. This system uses a centrifugal sludge pump in conjunction with a hydrocyclone to efficiently separate the carrier in the sediment and circulate it back into the flocculation tank, thus reducing the carrier loss rate.

[0130] 3. This system can monitor the operating data of the carrier replenishment system and feed it back to the carrier control system, so as to carry out rapid and accurate carrier replenishment operations in the sewage treatment process by cooperating with the carrier control system through real-time monitoring of operating data.

[0131] 4. This system effectively mixes sewage and solid waste in the sediment pumped by the centrifugal sludge pump into slurry through a sludge shear machine, which enables the hydrocyclone to separate the carrier more quickly and thoroughly, thus improving the overall carrier separation efficiency.

[0132] The above are merely several specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0133] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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. Without further limitations, 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 the element.

[0134] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A method for calculating carrier replenishment in wastewater treatment, characterized in that, include: S1, obtain the first actual carrier density of the coagulation tank and the second actual carrier density of the flocculation tank; S2, Based on a preset carrier density range, calculate the carrier missing amount according to the first actual carrier density and the second actual carrier density; S3, obtain the sludge level height of the sedimentation tank, and determine the target sediment volume to be pumped from the sedimentation tank based on the carrier loss amount and the sludge level height; S4. Based on the target sediment volume, the sediment in the sedimentation tank is extracted, and based on the pressure at the front end of the hydrocyclone and the maximum working capacity of the hydrocyclone, the type and number of hydrocyclones to be opened are determined. S5, obtain the sediment flow rate at the front end of each activated hydrocyclone, and calculate the first carrier quantity returned to the flocculation tank based on the sediment flow rate using Formula 1, where Formula 1 is: Where Mz represents the first carrier quantity, d represents the carrier content ratio parameter in the sludge-water mixture, ρ3 represents the carrier density in the sedimentation tank, and q i η represents the sediment flow rate at the front end of the i-th activated hydrocyclone. i This represents the carrier separation efficiency corresponding to the i-th activated hydrocyclone, and n represents the number of activated hydrocyclones. S6, calculate the amount of the second carrier added to the flocculation tank using Formula 2, and return to S1. Formula 2: Ms = ρ r V2-ρ1V1-ρ2V2-Mz, where Ms represents the second carrier quantity, ρ r V1 represents the maximum carrier density corresponding to the influent turbidity within the preset carrier density range, V2 represents the volume of the flocculation tank, ρ1 represents the solid density of the coagulation tank, and Mz represents the first carrier quantity.

2. The carrier replenishment calculation method according to claim 1, characterized in that, S3 include: S31, Obtain the mud level height of each mud hopper in the sedimentation tank; S32, determine whether the mud level height of the mud hopper is less than the preset mud level; S33, if the mud level height of any of the mud hoppers is greater than or equal to the preset mud level, then based on the carrier loss, the first sediment volume of the sediment transported to the hydrocyclone is calculated using Formula 3, where Formula 3 is: Wherein, Qr represents the volume of the first precipitate, Ma represents the amount of carrier missing, d represents the ratio of carrier in mud and water, and ρ3 represents the carrier density of the sedimentation tank. S34, based on the volume of the first precipitate, calculate the volume of the second precipitate drawn from the sedimentation tank using Formula 4, where Formula 4 is: Where Qn represents the volume of the second precipitate, Qr represents the volume of the first precipitate, and a represents the mud-water circulation ratio parameter.

3. The carrier replenishment calculation method according to claim 2, characterized in that, S3 also includes: S35, determine the actual volume of sediment in the sedimentation tank based on the mud level height in each mud hopper; S36, determine whether the actual precipitate volume is greater than or equal to the second precipitate volume; S37, if the actual precipitate volume is greater than or equal to the second precipitate volume, then the second precipitate volume is determined as the target precipitate volume, and the first precipitate volume is determined as the intermediate precipitate volume.

4. The carrier replenishment calculation method according to claim 3, characterized in that, S3 also includes: S38, if the actual precipitate volume is less than the second precipitate volume, then the actual precipitate volume is determined as the target precipitate volume, and the intermediate precipitate volume corresponding to the actual precipitate volume is calculated using Formula 5, where Formula 5 is: Wherein, Qk represents the intermediate precipitate volume corresponding to the actual precipitate volume, Qe represents the actual precipitate volume, and the intermediate precipitate volume corresponding to the actual precipitate volume is determined as the intermediate precipitate volume.

5. The carrier replenishment calculation method according to claim 4, characterized in that, S4 include: S41, based on the target sediment volume and the intermediate sediment volume, determine the type and number of centrifugal sludge pumps to be activated, such that the ratio of the target sediment volume to the intermediate sediment volume satisfies... Where 'a' represents the mud-water circulation ratio parameter; S42, obtain the pressure value at the front end of the hydrocyclone, and start the hydrocyclone according to the pressure value and the maximum working capacity of the hydrocyclone.

6. The carrier replenishment calculation method according to claim 2, characterized in that, S3 also includes: S39, if the mud level in the mud hopper is lower than the preset mud level, the sediment that is not drawn from the sedimentation tank will enter S6.

7. A carrier replenishment system for wastewater treatment, characterized in that, include: Coagulation tank, flocculation tank, sedimentation tank, sludge tank, carrier recovery system and carrier control system, The coagulation tank, the flocculation tank, and the sedimentation tank are connected in sequence; The carrier recovery system includes at least one centrifugal sludge suction pump and multiple hydrocyclones. The input end of each centrifugal sludge suction pump is connected to the sedimentation tank, and the output end of each centrifugal sludge suction pump is connected to the input end of at least one hydrocyclone. The output end of the hydrocyclone is connected to the flocculation tank and the sludge tank. The carrier control system is connected to the coagulation tank, the flocculation tank, the sedimentation tank and the carrier recovery system respectively, and uses the carrier replenishment calculation method for sewage treatment according to any one of claims 1-6.

8. The carrier supply system according to claim 7, characterized in that, The system also includes: densitometers installed in the coagulation tank and the flocculation tank, sludge level gauges installed in the sedimentation tank, and pressure gauges and flow meters installed at the front end of each hydrocyclone, for monitoring the operating data of the carrier supply system and feeding it back to the carrier control system.

9. The carrier supply system according to claim 7, characterized in that, The system also includes a carrier addition system, which is connected to the carrier control system and is also connected to the flocculation tank, for adding the second carrier to the flocculation tank.

10. The carrier supply system according to claim 7, characterized in that, The system also includes a slurry shear machine, the input end of which is connected to the centrifugal slurry pump, and the output end of which is connected to the hydrocyclone. The slurry shear machine is used to break up the sediment pumped by the centrifugal slurry pump and transport the broken up sediment to the hydrocyclone.

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