A dosing system and method for underground sewage treatment plant

Abstract

The present invention discloses a dosing system and method for underground sewage treatment plants, including: an above-ground drug unloading device for receiving drug liquid from a drug transport tank truck; multiple drug liquid storage tanks located in the underground sewage treatment plant, connected to a drug unloading interface through a drug unloading pipe, for storing drug liquid; multiple treatment structures, respectively located under the multiple drug liquid storage tanks, for treating sewage using drug liquid dripped from the multiple drug liquid storage tanks. The present invention also controls the drug unloading process by detecting the liquid levels of the multiple drug liquid storage tanks, and uses an electric regulating valve to accurately control the drug addition flow rate according to the water inlet flow rate and chemical substance concentration of the treatment structure, thereby enabling accurate dosing of drug liquid, improving sewage treatment efficiency and drug utilization rate, and having economic and application value in the fields of sewage treatment and environmental protection.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a dosing system and method applied to an underground sewage treatment plant. Background Art

[0002] Sewage treatment is an important part of environmental protection and resource recovery. Especially in the context of accelerated urbanization and expanded industrial production, the development of sewage treatment technology is particularly critical. Underground sewage treatment plants have gradually become an important part of urban sewage treatment due to their advantages of concealment and not occupying surface space. The dosing system plays a vital role in the sewage treatment process. It removes pollutants by accurately adding various chemicals to achieve water quality discharge and resource recovery.

[0003] However, the existing dosing system for underground sewage treatment plants has some defects in practical application. The traditional dosing system usually pumps the liquid medicine from the unloading vehicle into the liquid medicine storage tank through the unloading pump. This method not only consumes a lot of energy, but also easily causes equipment wear and failure. In addition, the existing dosing system lacks dynamic control capabilities and cannot be adjusted according to real-time water quality and flow changes, resulting in a mismatch between the dosage of the agent and the actual demand, affecting the efficiency and effect of sewage treatment.

[0004] In summary, the existing technology lacks an underground sewage treatment plant dosing system that can use gravity to transport liquid medicine without power and accurately, and has real-time monitoring and dynamic control capabilities. Summary of the invention

[0005] The present invention aims to provide a dosing system and method for an underground sewage treatment plant, which can solve the problems of high energy consumption and lack of dynamic control capability in related technologies.

[0006] According to one aspect of the present invention, there is provided a drug adding system for an underground sewage treatment plant, comprising: a drug unloading device, located on the ground, the drug unloading device being provided with a drug unloading interface, the drug unloading interface being used to receive drug liquid from a drug transport tank truck; a plurality of drug liquid storage tanks, located in the underground sewage treatment plant, connected to the drug unloading interface via drug unloading pipes, for storing the drug liquid; a plurality of treatment structures, respectively located under the plurality of drug liquid storage tanks, for treating sewage using the drug liquid dripped into the plurality of drug liquid storage tanks.

[0007] Preferably, the drug unloading pipe includes: a drug unloading main pipe, the upper end of which is connected to the drug unloading interface, and the lower end of which is provided with multiple liquid separation ports; multiple drug unloading branch pipes, the upper ends of which are respectively connected to the multiple liquid separation ports, and the bottoms are respectively connected to the corresponding multiple drug liquid storage tanks, and the multiple drug unloading branch pipes are provided with corresponding multiple electric drug delivery valves and multiple electric exhaust valves.

[0008] Preferably, the bottom of the multiple liquid medicine storage tanks is provided with corresponding multiple electric regulating valves and multiple pipes of dosing pipe flowmeters, which are connected to the corresponding multiple treatment structures; the multiple electric regulating valves calculate the dosing flow of the multiple treatment structures according to the water inflow of the multiple treatment structures and the concentration of the chemical substances in the multiple treatment structures through the following formula, and the opening of the electric regulating valve is controlled so that the dosing pipe flow meter count value reaches the calculated value:

[0009] Among them, F i is the dosing flow rate of the ith treatment structure, K safe is the safety factor, Q i is the inflow flow rate of the ith treatment structure, C ij is the concentration of the jth chemical substance in the ith treatment structure, K j is the dosage coefficient of the chemical solution corresponding to the jth chemical substance, and m is the total number of the chemical substance that needs to be treated.

[0010] Preferably, the system controls the drug unloading process by detecting the liquid levels of the multiple drug liquid storage tanks, including: calculating the drug addition demand index E:

[0011]

[0012] Among them, H i is the liquid level of the i-th liquid storage tank, H high is the highest liquid level of the liquid storage tank, H low is the lowest liquid level of the liquid storage tank, F i is the dosing flow rate of the i-th treatment structure, and n is the number of the multiple liquid storage tanks; when the dosing demand index E is higher than the predetermined threshold E threshold When the drug unloading process starts, the drug unloading interface is opened, and all the electric drug delivery valves are opened.

[0013] Preferably, the system controls the drug unloading process by detecting the liquid levels of the multiple drug liquid storage tanks, and further comprises: when the liquid level of the i-th drug liquid storage tank rises to H threshold When the electric drug delivery valve of the i-th drug unloading branch is closed, the electric exhaust valve of the i-th drug unloading branch is opened, wherein the H threshold for:

[0014] H threshold =H high -H g

[0015] Among them, H high is the highest liquid level of the liquid storage tank, H g is the volume of the drug unloading branch pipe; when all the electric drug delivery valves are closed, the drug unloading interface is closed and the drug unloading process ends.

[0016] Preferably, the system further comprises: a plurality of flow regulating devices, located on the plurality of treatment structures, for regulating the water inlet flow of each of the treatment structures according to the real-time requirements of the plurality of treatment structures; a plurality of water quality monitoring devices, located on the plurality of treatment structures, for obtaining water quality monitoring data, the water quality monitoring data comprising the concentrations of COD, BOD, SS, ammonia nitrogen, nitrate nitrogen, total phosphorus and dissolved oxygen in the plurality of treatment structures; the flow regulating device comprises a flow sensor, a control valve and a calculation module; the calculation module calculates the water inlet flow of the plurality of treatment structures according to the water quality monitoring data and the treatment requirements of the plurality of treatment structures:

[0017]

[0018] Among them, Q i is the inflow flow rate of the i-th treatment structure, Q total is the total water intake, W i is the priority weight of the i-th treatment structure, D i is the dosing requirement index of the ith treatment structure, and n is the number of the multiple drug liquid storage tanks.

[0019] Preferably, the dosing requirement index D i for:

[0020]

[0021] Among them, P i is the phosphorus content in the ith treatment structure, N i is the nitrogen content of the ith treatment structure, M i is the microbial content of the ith treatment structure, COD i is the chemical oxygen demand, BOD, of the ith treatment structure i is the biochemical oxygen demand of the ith treatment structure, SS i is the suspended solid content of the ith treatment structure, pH i is the pH value of the ith treatment structure, P max 、N max 、M max 、COD max 、BOD max SS max and pH max are the maximum allowed values ​​of these components and variables respectively, and α, β, γ, δ, ε, ζ and η are the corresponding weight coefficients.

[0022] According to another aspect of the present invention, there is provided a method for adding medicines for use in an underground sewage treatment plant, comprising: using an above-ground medicine unloading device to receive medicine liquid from a medicine transport tank truck; using a plurality of medicine liquid storage tanks located in the underground sewage treatment plant to store the medicine liquid, wherein the medicine liquid storage tanks are connected to a medicine unloading interface of the medicine unloading device via a medicine unloading pipe; and using the medicine liquid dripped into the plurality of medicine liquid storage tanks to treat sewage.

[0023] Preferably, the dosing flow of the multiple treatment structures is controlled by detecting the water inflow flow of the multiple treatment structures and the concentration of the chemical substance of the multiple treatment structures:

[0024]

[0025] Among them, F i is the dosing flow rate of the ith treatment structure, K safe is the safety factor, Q i is the inflow flow rate of the ith treatment structure, C ij is the concentration of the jth chemical substance in the ith treatment structure, K j is the dosage coefficient of the chemical solution corresponding to the jth chemical substance, and m is the total number of the chemical substance that needs to be treated.

[0026] Preferably, the method further comprises: calculating the drug addition requirement index E:

[0027]

[0028] Among them, H i is the liquid level of the i-th liquid storage tank, H high is the highest liquid level of the liquid storage tank, H low is the lowest liquid level of the liquid storage tank, F i is the dosing flow rate of the i-th treatment structure, n is the number of the multiple liquid storage tanks; when the dosing demand index E is higher than the predetermined threshold E threshold When the drug unloading process starts, the drug transport tank truck on the ground is connected to the drug unloading interface, and all the electric drug delivery valves on the drug unloading branch pipes are opened; when the liquid level of the i-th drug storage tank rises to H threshold When H threshold for:

[0029] H threshold =H high -H g

[0030] Among them, H high is the highest liquid level of the liquid storage tank, H gThe volume of the drug unloading branch pipe is as follows: When all the electric drug delivery valves are closed, the drug unloading interface is closed to end the drug unloading process.

[0031] The present invention provides a dosing system and method for underground sewage treatment plants, including: an above-ground drug unloading device for receiving drug liquid from a drug transport tank truck; multiple drug liquid storage tanks located in the underground sewage treatment plant, connected to a drug unloading interface through a drug unloading pipe, for storing drug liquid; multiple treatment structures, respectively located under the multiple drug liquid storage tanks, for treating sewage using drug liquid dripped from the multiple drug liquid storage tanks. The present invention also controls the drug unloading process by detecting the liquid levels of the multiple drug liquid storage tanks, and uses an electric regulating valve to accurately control the drug addition flow rate according to the water inlet flow rate and chemical substance concentration of the treatment structure, thereby achieving accurate dosing of drug liquid, improving sewage treatment efficiency and drug utilization rate, and having economic and application value in the fields of sewage treatment and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 is a schematic diagram of a dosing system applied to an underground sewage treatment plant according to an embodiment of the present invention;

[0034] Figure 2 is a flowchart of drug unloading operation according to an embodiment of the present invention; and

[0035] Figure 3 The figure is a flow chart of a dosing method applied to an underground sewage treatment plant according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0037] The embodiment of the present invention provides a dosing system for underground sewage treatment plants, such as Figure 1 As shown, it includes: a drug unloading device, which is located on the ground. A drug unloading interface is arranged in the drug unloading device, and the drug unloading interface is used to receive the drug liquid from the drug transport tank truck; a plurality of drug liquid storage tanks, which are located in the underground sewage treatment plant and are connected to the drug unloading interface via a drug unloading pipe and are used to store the drug liquid; a plurality of treatment structures, which are respectively located under the plurality of drug liquid storage tanks, and use the drug liquid dripped into the plurality of drug liquid storage tanks to treat the sewage.

[0038] In the related art, liquid medicine is usually pumped from a medicine transport tank truck into a liquid medicine storage tank through a medicine unloading pump. This method not only consumes a lot of energy, but is also prone to equipment wear and failure, making it difficult to achieve accurate medicine addition, resulting in medicine waste and poor treatment effect. The present invention realizes the non-powered and precise transportation of liquid medicine from the medicine transport tank truck on the ground to the liquid medicine storage tank under the ground by setting up a medicine unloading pipe. This not only eliminates the dependence on the medicine unloading pump and reduces energy consumption, but also reduces the equipment failure rate, ensuring the accuracy of medicine addition and the stability of sewage treatment effect.

[0039] According to an embodiment of the present invention, the drug unloading pipe includes: a drug unloading main pipe, the upper end of which is connected to the drug unloading interface, and the lower end of which is provided with multiple liquid separation ports; multiple drug unloading branch pipes, the upper ends of which are respectively connected to the multiple liquid separation ports, and the bottoms are respectively connected to the corresponding multiple drug liquid storage tanks, and the multiple drug unloading branch pipes are provided with corresponding multiple electric drug delivery valves and multiple electric exhaust valves.

[0040] In the related art, especially when it is necessary to deliver liquid medicine to multiple storage tanks at the same time, it is difficult to accurately control the amount of liquid in each storage tank, which affects the overall dosing effect and sewage treatment efficiency. The present invention achieves uniform distribution of liquid medicine by setting corresponding multiple electric medicine delivery valves and multiple electric exhaust valves on multiple drug unloading branches, avoids pipeline blockage and waste of liquid medicine, and ensures that each storage tank can receive the appropriate amount of liquid medicine as required.

[0041] According to an embodiment of the present invention, the bottom of the plurality of liquid medicine storage tanks is provided with corresponding plurality of electric regulating valves and pipes of a plurality of dosing pipe flow meters, which are connected to the corresponding plurality of treatment structures; the plurality of electric regulating valves control the dosing flow of the plurality of treatment structures according to the water inflow of the plurality of treatment structures and the concentration of the chemical substances in the plurality of treatment structures through the following formula:

[0042]

[0043] where F i is the dosing flow rate of the ith treatment structure, K safe is the safety factor, Q i is the inflow flow rate of the ith treatment structure, C ij is the concentration of the jth chemical substance in the ith treatment structure, K j is the dosage coefficient of the chemical solution corresponding to the jth chemical substance, and m is the total number of the chemical substance that needs to be treated.

[0044] The present invention provides an electric regulating valve at the bottom of the liquid medicine storage tank, and accurately controls the dosing flow rate according to the water inlet flow rate and chemical substance concentration of the treatment structure, thereby achieving accurate dosing of the liquid medicine and improving the sewage treatment efficiency and the utilization rate of the medicine.

[0045] According to an embodiment of the present invention, the system controls the drug unloading process by detecting the liquid levels of the multiple drug liquid storage tanks, including: calculating the drug addition demand index E:

[0046]

[0047] Among them, H i is the liquid level of the i-th liquid storage tank, H high is the highest liquid level of the liquid storage tank, H low is the lowest liquid level of the liquid storage tank, F i is the dosing flow rate of the i-th treatment structure, and n is the number of the multiple liquid storage tanks; when the dosing demand index E is higher than the predetermined threshold E threshold When the drug unloading process starts, the drug unloading interface is opened, and all the electric drug delivery valves are opened.

[0048] The embodiment of the present invention controls the drug unloading process according to the liquid level of the drug liquid storage tank and the drug flow rate of the treatment structure by calculating the drug dosing demand index. When the drug dosing demand index is higher than a predetermined threshold, the drug unloading process begins, and the drug unloading interface and all electric drug delivery valves are fully opened, thereby achieving precise control of the drug unloading process, ensuring that the drug liquid can be evenly distributed to each treatment structure, and improving the efficiency and effect of the drug dosing system.

[0049] According to an embodiment of the present invention, the system controls the drug unloading process by detecting the liquid levels of the multiple drug liquid storage tanks, such as Figure 2 As shown, it also includes: when the liquid level of the i-th liquid storage tank rises to H threshold When the electric drug delivery valve of the i-th drug unloading branch is closed, the electric exhaust valve of the i-th drug unloading branch is opened, wherein the H threshold for:

[0050] H threshold =H high -H g

[0051] Among them, H high is the highest liquid level of the liquid storage tank, H g is the volume of the drug unloading branch pipe; when all the electric drug delivery valves are closed, the drug unloading interface is closed and the drug unloading process ends.

[0052] In the related art, the lack of precise control during the drug unloading process easily leads to drug liquid overflow, waste and uneven distribution, affecting the operating efficiency of the entire dosing system and the sewage treatment effect. In the embodiment of the present invention, the drug unloading process is further optimized by detecting the liquid level of the drug liquid storage tank, thereby not only preventing the waste of drug liquid, but also ensuring the uniformity and accuracy of drug liquid distribution.

[0053] According to an embodiment of the present invention, the system further includes: a plurality of flow regulating devices, located on the plurality of treatment structures, for regulating the water inlet flow of each of the treatment structures according to the real-time requirements of the plurality of treatment structures; a plurality of water quality monitoring devices, located on the plurality of treatment structures, for obtaining water quality monitoring data, the water quality monitoring data including the concentrations of COD, BOD, SS, ammonia nitrogen, nitrate nitrogen, total phosphorus and dissolved oxygen in the plurality of treatment structures; the flow regulating device includes a flow sensor, a control valve and a calculation module; the calculation module calculates the water inlet flow of the plurality of treatment structures according to the water quality monitoring data and the treatment requirements of the plurality of treatment structures:

[0054]

[0055] Among them, Q i is the inflow flow rate of the i-th treatment structure, Q total is the total water intake, W i is the priority weight of the i-th treatment structure, D i is the dosing requirement index of the ith treatment structure, and n is the number of the multiple drug liquid storage tanks.

[0056] In the embodiment of the present invention, accurate control of the water inlet flow rate is achieved through dynamic regulation, ensuring that each treatment structure can receive an appropriate amount of liquid medicine and water inlet according to actual needs, thereby improving the efficiency of sewage treatment and the utilization rate of the medicine, and solving the problems of waste of medicine and poor treatment effect caused by the inability to dynamically regulate the water inlet flow rate in the prior art.

[0057] According to an embodiment of the present invention, the dosing requirement index D i for:

[0058]

[0059] Among them, P i is the phosphorus content in the ith treatment structure, N i is the nitrogen content of the ith treatment structure, M i is the microbial content of the ith treatment structure, COD i is the chemical oxygen demand, BOD, of the ith treatment structure i is the biochemical oxygen demand of the ith treatment structure, SS i is the suspended solid content of the ith treatment structure, pH i is the pH value of the ith treatment structure, P max 、N max 、M max 、COD max 、BOD max SS max and pH maxare the maximum allowed values ​​of these components and variables respectively, and α, β, γ, δ, ε, ζ and η are the corresponding weight coefficients.

[0060] In the embodiment of the present invention, by introducing the dosing requirement index, the system can accurately reflect the actual dosing requirement of each treatment structure, which not only improves the utilization rate of the reagents and reduces the waste of reagents, but also significantly improves the overall effect of sewage treatment and solves the problem of inaccurate dosing process in the prior art.

[0061] According to another embodiment of the present invention, a dosing method for underground sewage treatment plants is provided. Figure 3 As shown, it includes: using a drug unloading device on the ground to receive drug liquid from a drug transport tank truck; using multiple drug liquid storage tanks located in an underground sewage treatment plant to store the drug liquid, wherein the drug liquid storage tanks are connected to the drug unloading interface of the drug unloading device via a drug unloading pipe; and using the drug liquid dripped into the multiple drug liquid storage tanks to treat sewage.

[0062] In the related art, when the traditional dosing method is applied in underground sewage treatment plants, it usually relies on mechanical pumps to transport the liquid medicine from the ground to the underground storage tank, which not only increases energy consumption, but also brings complexity to equipment maintenance and failure. In the embodiment of the present invention, by allowing the liquid medicine to flow naturally into the underground storage tank under the action of gravity, and then dripping into the treatment structure through the storage tank for sewage treatment, the dependence on mechanical pumps is eliminated, the non-powered transportation of the liquid medicine is realized, the energy consumption and maintenance costs are reduced, and at the same time, the uniform distribution of the liquid medicine is ensured, and the efficiency of the overall system and the sewage treatment effect are improved.

[0063] According to an embodiment of the present invention, the dosing flow of the multiple treatment structures is controlled by detecting the water inflow flow of the multiple treatment structures and the concentration of the chemical substance of the multiple treatment structures:

[0064]

[0065] Among them, F i is the dosing flow rate of the ith treatment structure, K safe is the safety factor, Q i is the inflow flow rate of the ith treatment structure, C ij is the concentration of the jth chemical substance in the ith treatment structure, K j is the dosage coefficient of the chemical solution corresponding to the jth chemical substance, and m is the total number of the chemical substance that needs to be treated.

[0066] The embodiment of the present invention ensures accurate dosing of the agent by arranging real-time monitoring and dynamic adjustment, avoids waste of the agent, improves the effect and efficiency of sewage treatment, and realizes dynamic management of the dosing process.

[0067] According to an embodiment of the present invention, the method further includes: calculating a drug addition requirement index E:

[0068] Among them, H i is the liquid level of the i-th liquid storage tank, H high is the highest liquid level of the liquid storage tank, H low is the lowest liquid level of the liquid storage tank, F i is the dosing flow rate of the i-th treatment structure, n is the number of the multiple liquid storage tanks; when the dosing demand index E is higher than the predetermined threshold E threshold When the drug unloading process starts, the drug transport tank truck on the ground is connected to the drug unloading interface, and all the electric drug delivery valves on the drug unloading branch pipes are opened; when the liquid level of the i-th drug storage tank rises to H threshold When H threshold for:

[0069] H threshold =H high -H g

[0070] Among them, H high is the highest liquid level of the liquid storage tank, H g The volume of the drug unloading branch pipe is as follows: When all the electric drug delivery valves are closed, the drug unloading interface is closed to end the drug unloading process.

[0071] The embodiment of the present invention adjusts each step of the drug unloading process by calculating the drug addition demand index, thereby achieving precise control of the drug unloading process, ensuring uniform distribution and efficient utilization of the drug solution, and improving the overall effect of sewage treatment and the stability of system operation.

[0072] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0073] Figure 1 The dosing system applied to an underground sewage treatment plant according to an embodiment of the present invention is shown, which is specifically divided into a dosing system, a dosing system and a central control system.

[0074] The drug unloading system includes a drug unloading device skid, a quick connector, a drug unloading main pipe, a first drug unloading branch pipe, a second drug unloading branch pipe, a first electric valve, a second electric valve, a first electric exhaust valve, a second electric exhaust valve, a first drug liquid storage tank level gauge and a second drug liquid storage tank level gauge.

[0075] The dosing system includes a first liquid medicine storage tank, a second liquid medicine storage tank, a first electric regulating valve, a second electric regulating valve, a first dosing pipe flow meter, a second dosing pipe flow meter, a first water inlet pipe flow meter, a second water inlet pipe flow meter, a first online monitoring instrument, a second online monitoring instrument and supporting pipelines.

[0076] Figure 2 A medicine unloading operation flow chart according to an embodiment of the present invention is shown.

[0077] Working condition 1: unloading medicine.

[0078] The drug unloading device is located on the ground, and the drug transport tank truck is connected to the drug unloading device through a quick interface, and the drug liquid can directly reach each drug liquid storage tank by gravity.

[0079] Liquid levels H3 and H6 are the lowest liquid levels of the first and second liquid storage tanks, respectively;

[0080] Liquid levels H1 and H4 are the maximum liquid levels of the first and second liquid storage tanks, respectively;

[0081] The tank volumes calculated by the liquid level differences (H1-H2) and (H4-H5) are the volumes of the first and second drug unloading branches, respectively. The residual drug liquid in the drug unloading pipe can be recycled by switching the valve;

[0082] The total change in the liquid level difference of the drug storage tank during the drug unloading period is the drug unloading amount of the tank this time;

[0083] The first and second liquid medicine storage tanks can unload medicine at the same time, or can unload medicine in sequence.

[0084] Working condition 2: Dosing condition.

[0085] The first and second liquid medicine storage tanks are respectively located above the first and second treatment structure dosing points, and the liquid medicine can flow into the dosing points by gravity.

[0086] The system measures the concentration or concentration difference through the first and second monitoring instruments and records it as C (i) , the first and second water inlet flow meters are recorded as flow Q, and the required dosage can be calculated in real time as G, then the dosage is

[0087]

[0088] Among them, K is the safety factor and Ki is the dosage coefficient.

[0089] The system uses water volume, specific water quality indicators, calculation models and databases to comprehensively analyze, adjust and simulate the required dosage. The first and second dosing flow meters and the first and second electric regulating valves on the dosing pipe can achieve precise and intelligent dosing.

[0090] For example: when removing total nitrogen, suppose the required dosage of sodium acetate is G, the safety factor is K, the amount of water to be treated is Q, the sodium acetate dosage factor required for removing NO3-N is K1, the sodium acetate dosage factor required for removing NO2-N is K2, and the sodium acetate dosage factor required for removing DO is K3. The concentration difference between NO3-N and NO2-N in water is The concentration corresponding to DO is C (DO) .

[0091] The dosage of sodium acetate is:

[0092]

[0093] In summary, the present invention has the following advantages:

[0094] (1) The invention realizes non-powered and precise transportation of liquid medicine. The invention provides a main medicine unloading pipe and a branch medicine unloading pipe, and uses gravity to transport liquid medicine from the ground to the underground storage tank, thereby eliminating the dependence on mechanical pumps, reducing energy consumption and equipment maintenance costs, and ensuring uniform distribution of liquid medicine, thereby improving the efficiency of the dosing system.

[0095] (2) Dynamically control the dosage of liquid medicine. The present invention monitors the water flow rate and chemical concentration of the treatment structure in real time, and uses a flow regulating device to accurately control the dosage of liquid medicine, ensuring that the medicine matches the actual demand, avoiding waste of medicine, and significantly improving the sewage treatment effect and the utilization rate of the medicine.

[0096] (3) Optimize the control of the drug unloading process. The present invention dynamically adjusts the drug unloading process according to the liquid level of the storage tank and the needs of the treatment structure by calculating the drug adding demand index. By automatically opening and closing the electric drug delivery valve and the exhaust valve, the uniform distribution and efficient use of the drug solution are ensured, the overflow and waste of the drug solution are prevented, and the stability of the drug adding system and the overall sewage treatment effect are improved.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dosing system for underground sewage treatment plants, characterized in that: include: A medicine unloading device is located on the ground, and a medicine unloading interface is provided in the medicine unloading device, and the medicine unloading interface is used to receive the medicine liquid from the medicine transport tank truck; A plurality of liquid medicine storage tanks, located in the underground sewage treatment plant, connected to the medicine unloading interface via a medicine unloading pipe, and used for storing the liquid medicine; A plurality of treatment structures are respectively located under the plurality of liquid medicine storage tanks, and use the liquid medicine dripped into the plurality of liquid medicine storage tanks to treat the sewage; The drug unloading pipe includes: a drug unloading main pipe, the upper end of which is connected to the drug unloading interface, and the lower end of which is provided with a plurality of liquid separation ports; a plurality of drug unloading branch pipes, the upper ends of which are respectively connected to the plurality of liquid separation ports, and the bottoms of which are respectively connected to the corresponding plurality of drug liquid storage tanks, and the plurality of drug unloading branch pipes are provided with corresponding plurality of electric drug delivery valves and a plurality of electric exhaust valves; Wherein, the bottom of the plurality of liquid medicine storage tanks is provided with corresponding plurality of electric regulating valves and pipes of plurality of dosing pipe flow meters connected with corresponding plurality of treatment structures; The multiple electric regulating valves calculate the dosing flow of the multiple treatment structures according to the water inlet flow of the multiple treatment structures and the concentration of the chemical substances in the multiple treatment structures through the following formula, and the flow counting value of the dosing pipe reaches the calculated value by controlling the opening of the electric regulating valve: where F i is the dosing flow rate of the ith treatment structure, K safe is the safety factor, Q i is the inflow flow rate of the ith treatment structure, K j is the dosage coefficient of the chemical solution corresponding to the jth chemical substance, C ij is the concentration of the jth chemical substance in the i-th treatment structure, and m is the total number of chemical substances to be treated; The dosing system controls the drug unloading process by detecting the liquid levels of the multiple drug liquid storage tanks, including: Calculate the dosing requirement index E: Among them, H i is the liquid level of the i-th liquid storage tank, H high is the highest liquid level of the liquid storage tank, H low is the lowest liquid level of the liquid storage tank, F i is the dosing flow rate of the i-th treatment structure, and n is the number of the plurality of liquid medicine storage tanks; When the drug addition requirement index E is higher than the predetermined threshold value E threshold When the drug unloading process starts, the drug unloading interface is opened, and all the electric drug delivery valves are opened; When the liquid level of the i-th liquid storage tank reaches H threshold When the electric drug delivery valve of the i-th drug unloading branch is closed, the electric exhaust valve of the i-th drug unloading branch is opened, wherein the H threshold for: H threshold =H high -H g Among them, H high is the highest liquid level of the liquid storage tank, H g is the volume of the drug unloading branch pipe; When all of the electric drug delivery valves are closed, the drug unloading interface is closed, and the drug unloading process ends.

2. The dosing system according to claim 1, characterized in that: Also includes: A plurality of flow regulating devices, located on the plurality of treatment structures, for regulating the water inlet flow of each of the treatment structures according to the real-time needs of the plurality of treatment structures; A plurality of water quality monitoring devices, located on the plurality of treatment structures, for obtaining water quality monitoring data, the water quality monitoring data including the concentrations of COD, BOD, SS, ammonia nitrogen, nitrate nitrogen, total phosphorus and dissolved oxygen in the plurality of treatment structures; The flow regulating device includes a flow sensor, a control valve and a calculation module; The calculation module calculates the water inflow rate of the multiple treatment structures according to the water quality monitoring data and treatment requirements of the multiple treatment structures: Among them, Q i is the water inflow rate of the i-th treatment structure, Q total is the total water intake, W i is the priority weight of the i-th treatment structure, D i is the drug addition requirement index of the ith treatment structure, and n is the number of the plurality of drug solution storage tanks.

3. The dosing system according to claim 2, characterized in that: The dosing requirement index D i for: Among them, P i is the phosphorus content in the ith treatment structure, N i is the nitrogen content of the ith treatment structure, M i is the microbial content of the ith treatment structure, COD i is the chemical oxygen demand, BOD, of the ith treatment structure i is the biochemical oxygen demand of the ith treatment structure, SS i is the suspended solid content of the ith treatment structure, pH i is the pH value of the ith treatment structure, P max 、N max 、M max 、COD max 、BOD max SS max and pH max are the maximum allowed values ​​of these components and variables respectively, and α, β, γ, δ, ε, ζ and η are the corresponding weight coefficients.

4. A dosing method applied to an underground sewage treatment plant, characterized in that: include: Use the drug unloading device on the ground to receive the drug liquid from the drug transport tank truck; The liquid medicine is stored in a plurality of liquid medicine storage tanks located in an underground sewage treatment plant, wherein the liquid medicine storage tanks are connected to a medicine unloading interface of the medicine unloading device via a medicine unloading pipe; Using the liquid medicine dripped from the plurality of liquid medicine storage tanks to treat sewage; Controlling the dosing flow of the multiple treatment structures by detecting the water inflow flow of the multiple treatment structures and the chemical concentration of the multiple treatment structures: Among them, F i is the dosing flow rate of the ith treatment structure, K safe is the safety factor, Q i is the inflow flow rate of the ith treatment structure, C ij is the concentration of the jth chemical substance in the ith treatment structure, K j is the dosage coefficient of the chemical solution corresponding to the j-th chemical substance, and m is the total number of the chemical substances that need to be treated; Calculate the dosing requirement index E: Among them, H i is the liquid level of the i-th liquid storage tank, H high is the highest liquid level of the liquid storage tank, H low is the lowest liquid level of the liquid storage tank, F i is the dosing flow rate of the ith treatment structure, and n is the number of the plurality of liquid medicine storage tanks; When the drug addition requirement index E is higher than the predetermined threshold value E threshold When the drug unloading process starts, the drug transport tank truck on the ground is connected to the drug unloading interface, and the electric drug delivery valves on all drug unloading branch pipes are opened; When the liquid level of the i-th liquid storage tank rises to H threshold When the electric drug delivery valve of the i-th drug unloading branch is closed, the electric exhaust valve of the i-th drug unloading branch is opened, wherein the H threshold for: H threshold =H high -H g Among them, H high is the highest liquid level of the liquid storage tank, H g is the volume of the drug unloading branch pipe; When all the electric drug delivery valves are closed, the drug unloading interface is closed, and the drug unloading process ends.

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