A dynamic control method and system for water reuse in a waste transfer station

Abstract

This invention discloses a dynamic control method and system for reclaimed water reuse in waste transfer stations, belonging to the field of wastewater reuse and automatic control technology. The method determines the maximum allowable salt load and remaining available salt load for the system by acquiring the current water storage capacity and salt load parameters of the reclaimed water tank, the predicted water demand of the flushing terminal in the next control period, and the maximum allowable salt load threshold for the target reclaimed water. Based on the current salinity parameters of the treated wastewater, the allowable amount of treated wastewater to be added is calculated, and the water supply to the treated wastewater branch and the makeup water branch is controlled accordingly. This method can improve the utilization rate of treated wastewater while ensuring that the salt load of the terminal reclaimed water does not exceed the limit.

Description

Technical Field

[0001] This invention relates to the field of wastewater reuse and automatic control technology in waste transfer stations, and in particular to a dynamic control method and system for wastewater reuse in waste transfer stations based on salt load constraints. Background Technology

[0002] Waste transfer stations generate significant amounts of wastewater during waste compression and transfer, vehicle loading and unloading, equipment washing, and station floor cleaning. To reduce fresh water consumption and wastewater discharge, the wastewater from waste transfer stations is typically treated and reused for miscellaneous purposes such as vehicle washing and floor cleaning. Existing technologies have disclosed solutions for treating and storing wastewater from waste stations and recycling it for washing. For example, CN101920041A discloses a comprehensive disinfection, deodorization, and wastewater purification and recycling system for waste stations, in which wastewater is treated and then enters a purified water storage tank before being used for cyclical washing of the waste station.

[0003] With increasing demands for water conservation and resource utilization, simply achieving "treated wastewater reuse" is no longer sufficient to meet the refined control requirements under complex operating conditions. Especially in waste transfer station scenarios, treated effluent often does not fail to meet reuse requirements in all aspects; rather, it may only have certain salt content indicators that are high, such as high chloride ion content, while other indicators generally meet the conditions for miscellaneous reuse. In such cases, if a fixed-ratio water replenishment or simple instantaneous adjustment method is still used, it is easy to cause excessive water consumption, resulting in low utilization rate of treated wastewater and making it difficult to simultaneously meet the requirements of water conservation and resource utilization. Considering the engineering background corresponding to this application, the treated effluent exhibits the practical problem of "other indicators being basically acceptable, but chloride ion levels being high."

[0004] The closest existing technology to this application can be found in CN113900420B. This document discloses a digital management and control system and method for water ecology in metallurgical enterprises. It monitors water intake points, process water points, water treatment sections, and drainage points in real time, and dynamically adjusts the water balance based on the optimal water quality and quantity range for different water points, as well as the real-time water intake and return water quality status. This aims to meet water demand and avoid unnecessary increases in the quantity and salinity of high-salinity concentrated water. This document already demonstrates the technical approach of "dynamic optimization based on real-time status" and "paying attention to the impact of high salinity."

[0005] However, the closest comparative document mentioned above still mainly focuses on the digital management and control of water ecology at the plant-wide level in metallurgical enterprises. Its focus is on the balance of water quantity and quality between different water use points, the optimization of system-level water treatment configuration, and the avoidance of unnecessary increases in high-salt concentration water. It does not provide specific solutions to the following technical problems in the scenario of waste transfer station wastewater reuse: under the condition that the treated effluent is only high in some salt classification indicators, how to combine the current salt load of the water tank, the predicted water demand for the next control period, and the maximum allowable salt load threshold of the target reuse water corresponding to different flushing terminals to determine the maximum salt load allowed to be input into the reuse system in the next control period, and further calculate the allowable amount of treated wastewater to be added.

[0006] On the other hand, the water usage at waste transfer stations typically exhibits distinct phases and fluctuations. Factors such as concentrated vehicle entry and exit, cyclical operation of automatic car wash equipment, and concentrated ground washing all contribute to changes in water demand during different control periods. Furthermore, vehicle washing terminals are generally more sensitive to reclaimed water salinity than ground washing terminals. Most existing technologies lack a mechanism for setting differentiated salinity load thresholds for different washing terminals and coupling these thresholds with the current salinity load in the intermediate water tank and predicted water demand for control. This leads to two potential problems: first, excessive water replenishment for safety, resulting in low utilization rates of treated wastewater; second, insufficient control granularity, causing local terminals to exceed salinity load limits for reclaimed water.

[0007] Therefore, it is still necessary to provide a dynamic control method and system for reclaimed water reuse applicable to waste transfer station scenarios, in order to at least solve the following technical problems: under the circumstances that only some salt classification indicators of the treated effluent are high, water demand fluctuates at different control periods, and different flushing terminals have different tolerances for the salt load of the reclaimed water, how to improve the utilization rate of treated wastewater while ensuring that the maximum allowable salt load of the target reclaimed water at the flushing terminal is not exceeded. Summary of the Invention

[0008] The purpose of this invention is to provide a dynamic control method and system for water reuse in waste transfer stations, so as to at least solve the following problems existing in the prior art: Existing wastewater reuse schemes at waste transfer stations typically employ fixed-ratio mixing or control methods based on instantaneous water quality parameters, which makes it difficult to simultaneously meet the requirements of high utilization rate of treated wastewater and controlled salt load at the flushing terminal.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: The first aspect of this invention provides a dynamic control method for reclaimed water reuse in a waste transfer station, applied to a reuse system including a treated wastewater branch, a makeup water branch, a reclaimed water tank, and at least one flushing terminal, the method comprising: Obtain the current water storage capacity and current salt load parameters of the intermediate water tank; Obtain the predicted water demand parameters for each flushing terminal in the next control period, and determine the target maximum allowable salt load threshold for reclaimed water for each flushing terminal; Based on the predicted water demand parameters and the target maximum allowable salt load threshold for reclaimed water, determine the maximum salt load allowed to be input into the reclaimed water system during the next control period; Based on the current water storage parameters and current salt load parameters of the intermediate water tank, determine the remaining available salt load of the reuse system in the next control period; Based on the remaining available salt load and the current salinity parameters of the treated wastewater, calculate the allowable amount of treated wastewater to be added in the next control period. According to the allowable amount of admixture, control the treated wastewater branch and the water replenishment branch to supply water to the intermediate water tank, and / or control the treated wastewater branch and the water replenishment branch to mix and then supply water to the flushing terminal; This is to improve the utilization rate of treated wastewater so that the recycled water supplied to the flushing terminal during the next control period does not exceed the target maximum allowable salt load threshold for recycled water.

[0010] Preferably, the salt load parameter is a chloride ion load parameter, or an equivalent salt load parameter calculated based on conductivity and total dissolved solids concentration; the current salt parameters of the treated wastewater include at least one of chloride ion concentration, conductivity, and total dissolved solids concentration.

[0011] Preferably, the step of calculating the allowable amount of treated wastewater to be added in the next control period based on the remaining available salt load and the current salinity parameters of the treated wastewater includes: Based on the maximum salt load of the reuse system allowed to be input in the next control period and the current salt load of the middle water tank, calculate the remaining available salt load of the reuse system in the next control period; Based on the current salinity parameters of the treated wastewater, determine the salt load per unit volume of treated wastewater. Based on the remaining available salt load and the salt load corresponding to the unit volume of treated wastewater, the maximum allowable inflow volume of treated wastewater in the next control period is calculated as the allowable admixture amount.

[0012] Preferably, the flushing terminal includes at least a vehicle flushing terminal and a ground flushing terminal, and the maximum allowable salinity load threshold for the target recycled water corresponding to the vehicle flushing terminal is lower than the maximum allowable salinity load threshold for the target recycled water corresponding to the ground flushing terminal; the predicted water demand parameter is determined based on at least one of historical flushing operation data, vehicle entry and exit plans, automatic car wash machine operation procedures, and ground flushing operation plans.

[0013] Preferably, the control based on the allowable amount of admixture includes controlling the upper limit of the target influent flow rate of the treated wastewater branch, and adjusting the opening of the electric regulating valve, the start / stop of the delivery pump and / or the speed of the delivery pump set on the treated wastewater branch and / or the water replenishment branch according to the upper limit of the target influent flow rate.

[0014] Preferably, the method further includes: acquiring the liquid level parameters of the intermediate water tank and the actual flow rates of the treated wastewater branch and the water replenishment branch; starting water supply when the liquid level parameter is lower than a preset lower limit, and stopping water supply when the liquid level parameter reaches a preset upper limit; and outputting an alarm signal and closing at least one branch valve and / or stopping at least one branch pump when the actual flow rate deviates from the target flow rate by more than a preset threshold.

[0015] A second aspect of the present invention provides a dynamic control system for waste water reuse in a waste transfer station, comprising: The treated wastewater branch is used to transport the treated effluent from the high-concentration wastewater treatment system of the garbage transfer station. Water supply branch line, used to transport supplementary water; Medium-sized water tanks are used to store recycled water; At least one flushing terminal, connected to the intermediate water tank, is used for vehicle washing and / or ground washing; A water storage detection module is used to obtain the current water storage parameters of the intermediate water tank; A salt load detection module is used to obtain the current salt parameters in the intermediate water tank and / or the treated wastewater branch. The demand acquisition module is used to acquire the predicted water demand parameters of each flushing terminal in the next control period. The threshold determination module is used to determine the maximum allowable salt load threshold of the target reclaimed water for each flushing terminal. The maximum salt load calculation module is used to determine the maximum salt load that can be input into the reuse system in the next control period based on the predicted water demand parameters and the target maximum allowable salt load threshold for reused water. The remaining available salt load calculation module is used to determine the remaining available salt load of the reuse system in the next control period based on the current water storage parameters and current salt load parameters of the medium water tank. The allowable addition calculation module is used to calculate the allowable addition amount of the treated wastewater in the next control period based on the remaining available salt load and the current salinity parameters of the treated wastewater. The control module is used to control the inflow of water into the treated wastewater branch and the makeup water branch according to the allowable amount of admixture.

[0016] Preferably, the salt load detection module includes at least one of a chloride ion detector, a conductivity meter, and a total dissolved solids detector; the water storage detection module includes a level gauge and / or a flow meter; and the control module includes at least one of a programmable controller, an industrial computer, and a server.

[0017] Preferably, a flow meter and an electric regulating valve are respectively installed on the treated wastewater branch and the water supply branch, and a water supply pump set is installed on the outlet side of the intermediate water tank; the allowable admixture calculation module is configured to: calculate the remaining available salt load in the next control period based on the maximum salt load allowed to be input into the reuse system and the current salt load of the intermediate water tank; determine the salt load corresponding to a unit volume of treated wastewater based on the current salinity parameters of the treated wastewater; generate the maximum allowable inflow volume of treated wastewater in the next control period based on the remaining available salt load and the salt load corresponding to a unit volume of treated wastewater, as the allowable admixture amount; the control module controls the operation of the electric regulating valve and / or the water supply pump set according to the allowable admixture amount.

[0018] Compared with the prior art, especially with the closest prior art document CN113900420B, the present invention has at least the following beneficial effects: The control object of this invention is more specific and adaptable to the water reuse scenario in waste transfer stations. While CN113900420B discloses a dynamic optimization approach based on the optimal water quality and quantity range at different water usage points and the real-time water recovery status, it focuses on plant-wide digital water ecosystem balance control and does not specifically define the control object as the correspondence between the current salt load of the water tank in the waste transfer station, the maximum allowable salt load threshold for the target reuse water at the washing terminal, and the allowable amount of treated wastewater mixed in during the next control period. This invention, however, specifically limits the control logic to the water reuse scenario in waste transfer stations, making it more suitable for applications where vehicle washing and ground washing coexist, and where the treated effluent has a single high salt classification index.

[0019] The control objective of this invention is further enhanced from general dynamic optimization to "allowable admixture amount back-calculation control". The closest prior art emphasizes real-time dynamic adjustment and avoiding unnecessary increases in high-salt concentrate, but does not disclose: first, determining the maximum allowable salt load input to the system for the next control period; then, combining this with the current salt load in the intermediate water tank to calculate the remaining available salt load in the system; and further, back-calculating the allowable admixture amount based on the salt load per unit volume of treated wastewater. This invention achieves an improvement from "dynamic optimization" to "quantitative back-calculation control based on salt load constraints" through the above chain, thus providing more direct guidance for the ratio control of treated wastewater and makeup water.

[0020] This invention improves the utilization rate of treated wastewater without exceeding the terminal salt load constraint. In existing technologies, the lack of salt load constraint control for the next control period often leads to conservative water replenishment strategies, thus reducing the utilization rate of treated wastewater. This invention, by introducing the current salt load of the intermediate water tank, predicted water demand, and the maximum allowable salt load threshold for the target reclaimed water, can increase the upper limit of the usable wastewater after treatment while ensuring that the terminal reclaimed water salt load is controlled. Therefore, it is more suitable for practical engineering scenarios where "only chloride ion levels are high in the treated effluent."

[0021] This invention enables differentiated control of different washing terminals. Compared to the closest prior art, which mainly focuses on dynamic optimization of water quantity and quality from a system-wide perspective, this invention can further set different maximum allowable salt load thresholds for target recycled water for vehicle washing terminals and ground washing terminals. This allows for stricter control strategies under vehicle washing conditions and appropriately increases the allowable amount of treated wastewater mixed in under ground washing conditions, thereby improving the system's adaptability to different reuse conditions.

[0022] This invention is easy to implement in conjunction with existing engineering equipment. The control logic of this invention can be implemented in conjunction with flow meters, electric regulating valves, level gauges, water supply pump sets, and controllers. In engineering, it can be directly superimposed on the existing waste transfer station water reuse system. The closest prior art is more of a digital management and control architecture for water ecology in large industrial enterprises. This invention is more targeted and has a clearer implementation path in in-station reuse systems such as waste transfer stations. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the dynamic control system for water reuse in a waste transfer station according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of a dynamic control method for water reuse in a waste transfer station according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram illustrating the calculation logic for the allowable amount of wastewater to be added after treatment in one embodiment of the present invention. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0027] Example 1: Basic Dynamic Control Example like Figure 1 and Figure 2As shown, a dynamic control system for reclaimed water reuse in a waste transfer station includes a treated wastewater branch line 1, a water replenishment branch line 2, a reclaimed water tank 3, a water supply pump set 4, a vehicle washing terminal 5, a ground washing terminal 6, a water storage detection module 7, a salt load detection module 8, a demand acquisition module 9, a threshold determination module 10, a maximum salt load calculation module 11, a remaining available salt load calculation module 12, an allowable amount of admixture calculation module 13, and a control module 14.

[0028] Among them, the treated wastewater branch line 1 is connected to the outlet of the high-concentration wastewater treatment system of the garbage transfer station and is used to transport the treated effluent; the water replenishment branch line 2 is used to transport replenishment water, preferably tap water; the medium water tank 3 is used to store recycled water; the water supply pump set 4 is connected to the outlet of the medium water tank 3 and is used to supply water to the vehicle washing terminal 5 and the ground washing terminal 6.

[0029] In this embodiment, the water storage detection module 7 includes a level gauge and a flow meter, and the salt load detection module 8 includes a conductivity meter or a chloride ion detector. The control module 14 can be implemented using a programmable logic controller, an industrial computer, or a combination of both.

[0030] The method in this embodiment includes the following steps: S101: Obtain the current water storage capacity and current salt load parameters of the intermediate water tank 3.

[0031] The current water storage capacity parameter can be obtained by converting the liquid level gauge, and the current salt load parameter can be determined based on the chloride ion concentration, conductivity, or total dissolved solids concentration of the recycled water in the medium-water tank.

[0032] S102: Obtain the predicted water demand parameters for each flushing terminal in the next control period, and determine the target maximum allowable salt load threshold for reclaimed water for each flushing terminal.

[0033] For example, based on the car wash machine operation plan, historical vehicle entry and exit data, and floor washing operation periods, the water demand for vehicle washing and floor washing in the next control period can be predicted. For vehicle washing terminals, which are more sensitive to salt content, a lower target maximum allowable salt load threshold for recycled water is set; for floor washing terminals, a relatively higher threshold can be set.

[0034] S103: Based on the predicted water demand parameters and the target maximum allowable salt load threshold for reclaimed water, determine the maximum salt load that can be input into the reclaimed water system during the next control period.

[0035] For example, it can be calculated by multiplying the predicted water consumption by the corresponding threshold, or by weighting the calculation based on the combined operating conditions of multiple terminals.

[0036] S104: Based on the current water storage parameters and current salt load parameters of the intermediate water tank 3, determine the remaining available salt load of the system in the next control period.

[0037] For example, it can be obtained by subtracting the current salt load in the intermediate water tank from the maximum salt load allowed to be input into the system during the next control period.

[0038] S105: Calculate the allowable amount of treated wastewater to be added during the next control period based on the remaining available salt load and the current salinity parameters of the treated wastewater.

[0039] Specifically, the salt load per unit volume of treated wastewater can be determined first based on the current chloride ion concentration, conductivity, or total dissolved solids concentration of the treated wastewater. Then, the maximum allowable inflow volume of the treated wastewater can be obtained by dividing the remaining available salt load by the salt load per unit volume of treated wastewater, which serves as the allowable amount of admixture.

[0040] S106: Based on the allowable amount of admixture, control the supply of water from the treated wastewater branch 1 and the water replenishment branch 2 to the intermediate water tank 3, and / or control the supply of water from the treated wastewater branch 1 and the water replenishment branch 2 to each flushing terminal after mixing.

[0041] In this embodiment, the control module 14 can calculate the target influent flow limit based on the allowable amount of treated wastewater to be added, and control the opening of the electric regulating valve or the speed of the delivery pump set on the treated wastewater branch 1 and the water replenishment branch 2.

[0042] Through the above steps, this embodiment can ensure that the recycled water supplied to the vehicle washing terminal 5 and the ground washing terminal 6 does not exceed the corresponding threshold under the dynamic conditions of the next control period, while maximizing the utilization rate of the treated wastewater.

[0043] Example 2: Differentiated Control Implementation for Different Flushing Terminals This embodiment is basically the same as Embodiment 1, except that the system sets different target maximum allowable salt load thresholds for reclaimed water for different flushing terminals.

[0044] Specifically, the maximum permissible salt load threshold for the target recycled water corresponding to vehicle washing terminal 5 is lower than the threshold corresponding to ground washing terminal 6. When the demand acquisition module 9 determines that there are many vehicle washing tasks in the next control period, the control module 14 reduces the permissible amount of treated wastewater to be added; when it determines that the next control period is mainly ground washing tasks, the control module 14 increases the permissible amount of treated wastewater to be added accordingly.

[0045] Therefore, this embodiment can achieve differentiated control of the same wastewater reuse system under different operating conditions, thereby improving the system's adaptability and overall economy.

[0046] Example 3: Interlocking Protection Example In this embodiment, the system is further equipped with liquid level interlock and flow deviation interlock.

[0047] When the liquid level in the intermediate water tank 3 is lower than the preset lower limit, the control module 14 starts the wastewater branch 1 and / or the water replenishment branch 2 to supply water to the intermediate water tank 3; when the liquid level reaches the preset upper limit, the water supply stops.

[0048] When the actual flow rate of the treated wastewater branch 1 and the water supply branch 2 deviates from the target flow rate by more than a preset threshold, the control module 14 outputs an alarm signal and closes at least one branch electric regulating valve and / or stops at least one branch pump.

[0049] In addition, when the salt load detection module 8 detects an abnormal increase in the salt parameters in the intermediate water tank 3 or the treated wastewater branch 1, the control module 14 can reduce the allowable amount of treated wastewater added, and if necessary, suspend the entry of treated wastewater into the reuse system, retaining only the water supply branch 2.

[0050] Through the interlocking protection described above, this embodiment can further improve the stability and security of system operation.

[0051] Example 4: Calculation of Allowable Dosage like Figure 3 As shown, within a certain control period, the predicted total water consumption is assumed to be... The target maximum allowable salt load threshold for reclaimed water is Then the maximum salt load allowed to be input into the system during the next control period can be expressed as:

[0052] in, This indicates the maximum salt load allowed to be input into the system during the next control period. This indicates the predicted total water consumption for the next control period. This indicates the maximum permissible salt load threshold for the target recycled water.

[0053] Assume the current salt load of the intermediate water tank is The remaining available salt load of the system is:

[0054] in, This indicates the remaining available salt load in the system during the next control period. This indicates the current salt load in the intermediate water tank.

[0055] Let the salt load per unit volume of the treated wastewater be... The permissible amount of admixture in the treated wastewater. It can be represented as:

[0056] in, This indicates the permissible amount of treated wastewater to be added during the next control period. This indicates the salt load corresponding to the wastewater after treatment per unit volume.

[0057] The units of measurement for the above parameters are as follows:

[0058]

[0059]

[0060] In practical applications, the above calculations can be corrected based on the weights of different terminals, the conversion relationships of different salinity parameters, and safety factors. This invention is not limited to the specific formula form described above; as long as the core idea remains the same—determining the permissible amount of treated wastewater to be added based on the maximum allowable salt load of the system in the next control period and the current system salt load—it should fall within the scope of protection of this invention.

[0061] Those skilled in the art should understand that the above embodiments are merely preferred embodiments of the present invention, and any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dynamic control method for wastewater reuse in a waste transfer station, applied to a reuse system including a treated wastewater branch, a makeup water branch, a greywater tank, and at least one flushing terminal, characterized in that, include: Obtain the current water storage capacity and current salt load parameters of the intermediate water tank; Obtain the predicted water demand parameters for each flushing terminal in the next control period, and determine the target maximum allowable salt load threshold for reclaimed water for each flushing terminal; Based on the predicted water demand parameters and the target maximum allowable salt load threshold for reclaimed water, determine the maximum salt load allowed to be input into the reclaimed water system during the next control period; Based on the current water storage parameters and current salt load parameters of the intermediate water tank, determine the remaining available salt load of the reuse system in the next control period; Based on the remaining available salt load and the current salinity parameters of the treated wastewater, calculate the allowable amount of treated wastewater to be added in the next control period. According to the allowable amount of admixture, control the treated wastewater branch and the water replenishment branch to supply water to the intermediate water tank, and / or control the treated wastewater branch and the water replenishment branch to mix and then supply water to the flushing terminal; This is to improve the utilization rate of treated wastewater so that the recycled water supplied to the flushing terminal during the next control period does not exceed the target maximum allowable salt load threshold for recycled water.

2. The dynamic control method for water reuse in waste transfer stations according to claim 1, characterized in that, The salt loading parameter is the chloride ion loading parameter, or an equivalent salt loading parameter calculated based on conductivity and total dissolved solids concentration; The current salinity parameters of the treated wastewater include at least one of chloride ion concentration, conductivity, and total dissolved solids concentration.

3. The dynamic control method for water reuse in waste transfer stations according to claim 2, characterized in that, Based on the remaining available salt load and the current salinity parameters of the treated wastewater, calculate the allowable amount of treated wastewater to be added during the next control period, including: Based on the maximum salt load of the reuse system allowed to be input in the next control period and the current salt load of the middle water tank, calculate the remaining available salt load of the reuse system in the next control period; Based on the current salinity parameters of the treated wastewater, determine the salt load per unit volume of treated wastewater. Based on the remaining available salt load and the salt load corresponding to the unit volume of treated wastewater, the maximum allowable inflow volume of treated wastewater in the next control period is calculated as the allowable admixture amount.

4. The dynamic control method for water reuse in waste transfer stations according to claim 1, characterized in that, The flushing terminal includes at least a vehicle flushing terminal and a ground flushing terminal, and the maximum permissible salt load threshold for the target reclaimed water corresponding to the vehicle flushing terminal is lower than the maximum permissible salt load threshold for the target reclaimed water corresponding to the ground flushing terminal. The predicted water demand parameters are determined based on at least one of the following: historical flushing operation data, vehicle entry and exit plans, automatic car wash machine operation procedures, and ground flushing operation plans.

5. The dynamic control method for water reuse in waste transfer stations according to any one of claims 1-4, characterized in that, Control is performed according to the allowable amount of admixture, including controlling the target influent flow rate limit of the treated wastewater branch, and adjusting the opening of the electric regulating valve, the start and stop of the delivery pump and / or the speed of the delivery pump set on the treated wastewater branch and / or the water replenishment branch according to the target influent flow rate limit. The method further includes: acquiring the liquid level parameters of the intermediate water tank and the actual flow rates of the treated wastewater branch and the water replenishment branch; starting water supply when the liquid level parameter is lower than the preset lower limit, and stopping water supply when the liquid level parameter reaches the preset upper limit; and outputting an alarm signal and closing at least one branch valve and / or stopping at least one branch pump when the actual flow rate deviates from the target flow rate by more than a preset threshold.

6. A dynamic control system for water reuse in a waste transfer station, characterized in that, include: The treated wastewater branch is used to transport the treated effluent from the high-concentration wastewater treatment system of the garbage transfer station. Water supply branch line, used to transport supplementary water; Medium-sized water tanks are used to store recycled water; At least one flushing terminal, connected to the intermediate water tank, is used for vehicle washing and / or ground washing; A water storage detection module is used to obtain the current water storage parameters of the intermediate water tank; A salt load detection module is used to obtain the current salt parameters in the intermediate water tank and / or the treated wastewater branch. The demand acquisition module is used to acquire the predicted water demand parameters of each flushing terminal in the next control period. The threshold determination module is used to determine the maximum allowable salt load threshold of the target reclaimed water for each flushing terminal. The maximum salt load calculation module is used to determine the maximum salt load that can be input into the reuse system in the next control period based on the predicted water demand parameters and the target maximum allowable salt load threshold for reused water. The remaining available salt load calculation module is used to determine the remaining available salt load of the reuse system in the next control period based on the current water storage parameters and current salt load parameters of the medium water tank. The allowable addition calculation module is used to calculate the allowable addition amount of the treated wastewater in the next control period based on the remaining available salt load and the current salinity parameters of the treated wastewater. The control module is used to control the inflow of water into the treated wastewater branch and the makeup water branch according to the allowable amount of admixture.

7. The dynamic control system for waste water reuse in a waste transfer station according to claim 6, characterized in that, The salt load detection module includes at least one of a chloride ion detector, a conductivity meter, and a total dissolved solids detector; The water storage detection module includes a level gauge and / or a flow meter; The control module includes at least one of a programmable controller, an industrial computer, and a server.

8. The dynamic control system for waste water reuse in a waste transfer station according to claim 6, characterized in that, The treated wastewater branch and the makeup water branch are respectively equipped with flow meters and electric regulating valves. A water supply pump set is installed on the outlet side of the intermediate water tank. The allowable admixture calculation module is configured as follows: Calculate the remaining available salt load in the next control period based on the maximum salt load allowed to be input into the reuse system and the current salt load of the medium water tank. Based on the current salinity parameters of the treated wastewater, determine the salt load per unit volume of treated wastewater. Based on the remaining available salt load and the salt load corresponding to the unit volume of treated wastewater, the maximum allowable inflow volume of treated wastewater in the next control period is generated as the allowable amount of admixture. The control module controls the operation of the electric regulating valve and / or water supply pump group according to the allowable amount of admixture.

Images