Water supply method, irrigation method, device and system for recycling process wastewater

Abstract

The invention discloses a water supply method, an irrigation method, a device and a system for recycling process wastewater. The water supply method comprises the following steps: acquiring a target impurity content value of wastewater discharged from each factory in a factory; and according to the target impurity content value, screening out all target plants in the plant area. And according to the drainage experience parameters of the target workshops, dividing all the target workshops into continuous wastewater discharge workshops and intermittent wastewater discharge workshops. Wastewater discharged by the continuous wastewater discharge plant is controlled to be stored in the first wastewater pool, wastewater discharged by the intermittent wastewater discharge plant is controlled to be stored in the second wastewater pool, the wastewater in the first wastewater pool is used as conventional water supply, and the wastewater in the second wastewater pool is used as standby water supply. According to the water levels in the first wastewater pool and the second wastewater pool, the first wastewater pool is started for independent water supply, or the first wastewater pool and the second wastewater pool are started for synchronous water supply. The water supply method can effectively prevent the water conveying pipeline from being blocked.

Description

Technical Field

[0001] The embodiments of the present invention specifically relate to a water supply method, irrigation method, apparatus and system for the reuse of process wastewater. Background Art

[0002] In thermal power plants, most of the wastewater discharged from the plant cannot be directly reused and requires treatment before reuse; only a small portion of the wastewater discharged meets the requirements for direct reuse in specific situations. For example, low-chloride wastewater discharged from cooling towers can be used for irrigation of green spaces. Currently, thermal power plants collect all wastewater discharged from their plants, treat it centrally, and then reuse it. This results in high costs for reusing process wastewater, while the small portion of reusable wastewater is wasted.

[0003] Currently, there are solutions for reusing a small portion of wastewater that meets direct reuse requirements. In practical applications, wastewater discharged from factories is usually a suspension, requiring sedimentation and stratification in a storage tank to achieve a sludge removal effect. However, when this reusable wastewater enters the storage tank, turbulence or eddies easily form, preventing the sludge in the tank from settling. During water supply, the sludge can also easily enter the water delivery pipeline, causing blockages. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to address the above-mentioned deficiencies in the prior art by providing a water supply method, irrigation method, and apparatus for the reuse of process wastewater.

[0005] This system and water supply method can effectively prevent blockage of water pipelines.

[0006] According to an embodiment of a first aspect of the present invention, a water supply method for reusing process wastewater is provided, comprising:

[0007] Obtain the target impurity content values ​​of the wastewater discharged from each plant in the factory area;

[0008] Based on the target impurity content value, all target workshops in the factory area are screened out. The target workshops are those suitable for wastewater reuse.

[0009] Based on the drainage experience parameters of the target plants, all target plants are divided into continuous wastewater discharge plants and intermittent wastewater discharge plants.

[0010] Wastewater discharged from the continuous wastewater discharge plant is stored in the first wastewater tank to form laminar flow for sedimentation and sludge removal. Wastewater discharged from the intermittent wastewater discharge plant is stored in the second wastewater tank. Wastewater in the first wastewater tank is used for regular water supply, and wastewater in the second wastewater tank is used for backup water supply.

[0011] Depending on the water levels in the first and second wastewater tanks, the first wastewater tank can be opened for separate water supply, or the first and second wastewater tanks can be opened for simultaneous water supply.

[0012] Optionally, all target plants in the factory area can be screened based on the target impurity content value. Specifically, if the target impurity content value is less than or equal to the preset target concentration value, it is determined as a target plant.

[0013] Optionally, based on the drainage experience parameters of the target plants, all target plants are divided into continuous wastewater discharge plants and intermittent wastewater discharge plants, specifically:

[0014] Based on the drainage experience parameters of each target plant, the wastewater discharge regularity index of each target plant was calculated.

[0015] If the wastewater discharge regularity index of the target plant is greater than or equal to the preset threshold, the target plant is classified as a continuous wastewater discharge plant; if the wastewater discharge regularity index of the target plant is less than the preset threshold, the target plant is classified as an intermittent wastewater discharge plant.

[0016] Optionally, drainage experience parameters include: the annual effective wastewater discharge duration of the plant, the total annual operating time of the plant, and the hourly flow rate data of the plant.

[0017] Optionally, based on the wastewater discharge experience parameters of the target plant, the wastewater discharge regularity index of the target plant is calculated, specifically as follows:

[0018] Based on the annual effective wastewater discharge duration and the total annual operating time of the building in the drainage experience parameters, the ratio of effective wastewater discharge duration to total annual operating time is calculated.

[0019] Based on the hourly flow rate data in the drainage experience parameters, the average value and standard deviation of the hourly flow rate data of the plant are calculated;

[0020] The flow fluctuation coefficient of the factory is calculated based on the average value and standard deviation of the hourly flow data.

[0021] The wastewater discharge regularity index of the target plant is calculated based on the ratio of effective wastewater discharge time to total annual operating time and the flow fluctuation coefficient of the plant.

[0022] Optionally, the first wastewater tank includes a first reuse zone and a second reuse zone.

[0023] The wastewater discharged from the continuous wastewater discharge plant is controlled to be stored in the first wastewater pool. Specifically, the wastewater discharged from the continuous wastewater discharge plant is controlled to be divided into a first water flow and a second water flow. The first water flow enters the first reuse zone, and the second water flow enters the second reuse zone.

[0024] Optionally, depending on the water levels in the first and second wastewater tanks, the first wastewater tank may be activated for separate water supply, or the first and second wastewater tanks may be activated for simultaneous water supply, specifically including:

[0025] Determine whether the water level in the first reuse zone of the first wastewater tank is lower than the target water level.

[0026] If not, then the first reuse zone will be activated for separate water supply;

[0027] If so, then start synchronous water supply to the first and second reuse zones, and determine whether the water level in the second reuse zone is lower than the target water level:

[0028] If so, then the first reuse zone of the first wastewater tank, the second reuse zone, and the second wastewater tank will be opened for synchronous water supply.

[0029] According to a second aspect of the present invention, a method for irrigating a greening system is provided, comprising: implementing the above-described process wastewater reuse water supply method, wherein wastewater discharged from a plant suitable for wastewater reuse in a thermal power plant is transported to the greening system for irrigation.

[0030] According to a third aspect of the present invention, a water supply device for process wastewater reuse is provided, comprising: an acquisition unit, an analysis unit, a treatment unit, an inlet device, and a supply device; the acquisition unit is used to acquire the target impurity content value of the wastewater discharged from each plant in the plant area, and the drainage experience parameters of each plant; the analysis unit is electrically connected to the acquisition unit and is used to screen all target plants in the plant area, i.e., plants suitable for wastewater reuse, based on the target impurity content value; the treatment unit is electrically connected to the acquisition unit and the analysis unit and is used to process all target plants according to the drainage experience parameters of the target plants. The facility is divided into a continuous wastewater discharge plant and an intermittent wastewater discharge plant. The inlet equipment controls the storage of wastewater discharged from the continuous wastewater discharge plant into a first wastewater tank, where laminar flow is formed for sedimentation and sludge removal. It also controls the storage of wastewater discharged from the intermittent wastewater discharge plant into a second wastewater tank. The wastewater in the first wastewater tank is used for regular water supply, while the wastewater in the second wastewater tank is used as backup water supply. The supply equipment is used to activate the first wastewater tank for independent water supply or to activate both wastewater tanks simultaneously, based on their water levels.

[0031] Optionally, the analysis unit includes a first judgment module, which is used to determine the factory with a target impurity content value that is less than or equal to a preset target concentration value as the target factory.

[0032] Optionally, the processing unit includes a calculation module and a second judgment module; the calculation module is used to calculate the wastewater discharge regularity index of the target plant based on the drainage experience parameters of the target plant; the second judgment module is electrically connected to the calculation module and is used to classify the target plant as a continuous wastewater discharge plant when the wastewater discharge regularity index of the target plant is greater than or equal to a preset threshold; or, if the wastewater discharge regularity index of the target plant is less than the preset threshold, classify the target plant as an intermittent wastewater discharge plant.

[0033] Optionally, the drainage experience parameters include: the annual effective wastewater discharge duration of the plant, the annual total operating time of the plant, and the hourly flow rate data of the plant; the calculation module includes: a first calculation submodule, a second calculation submodule, a third calculation submodule, and a fourth calculation submodule; the first calculation submodule is used to calculate the ratio of the effective wastewater discharge duration to the annual total operating time based on the annual effective wastewater discharge duration and the annual total operating time of the plant in the drainage experience parameters; the second calculation submodule is used to calculate the average value and standard deviation of the hourly flow rate data of the plant based on the hourly flow rate data in the drainage experience parameters; the third calculation submodule is used to calculate the flow fluctuation coefficient of the plant based on the average value and standard deviation of the hourly flow rate data of the plant; the fourth calculation submodule is used to calculate the wastewater discharge regularity index of the target plant based on the ratio of the effective wastewater discharge duration to the annual total operating time and the flow fluctuation coefficient of the plant.

[0034] According to an embodiment of the fourth aspect of the present invention, an irrigation system for a greening system is provided, which employs the above-mentioned process wastewater recycling water supply device. The process wastewater recycling water supply device is used to transport wastewater discharged from the plant buildings in a thermal power plant that are suitable for wastewater recycling to the greening system for irrigation.

[0035] The wastewater reuse method in this embodiment of the invention first identifies target plants within the plant area that can reuse wastewater. Next, the wastewater discharged from these target plants is reused. Further, based on drainage experience parameters of the target plants, the wastewater discharged from these target plants is stored in a first wastewater tank or a second wastewater tank. That is, based on drainage experience parameters, the target plants are divided into two categories: continuous wastewater discharge plants and intermittent wastewater discharge plants. Continuous wastewater discharge plants can provide a relatively stable and continuous water supply, while the drainage from intermittent wastewater discharge plants, although reusable, has an unstable flow rate; that is, the flow rate of the drainage from intermittent wastewater discharge plants fluctuates. This fluctuation in flow rate can cause turbulence or eddies in the storage tank, preventing the sludge in the storage tank from settling.

[0036] This method physically isolates the influent flows of the continuous wastewater discharge plant and the intermittent wastewater discharge plant, ensuring a relatively stable flow rate into the first wastewater tank and thus preventing turbulence. In other words, this method improves the stability of the water flow in the first wastewater tank, avoiding the adverse effects of flow fluctuations and maintaining laminar flow to facilitate sludge settling and stratification, without affecting the regular water supply to the first wastewater tank. The second wastewater tank is only supplied when the water level in the first wastewater tank is insufficient; that is, the frequency and duration of water supply to the second wastewater tank are less, making it less likely to cause blockages in the water supply pipeline.

[0037] In summary, the wastewater reuse method of this process can effectively avoid blockage of water supply pipelines. Attached Figure Description

[0038] Figure 1 This is a flowchart of a water supply method for recycling process wastewater in some embodiments of the present invention;

[0039] Figure 2 This is a schematic diagram of the water supply device for recycling process wastewater in some embodiments of the present invention.

[0040] In the diagram: 1. First wastewater tank; 11. First reuse zone; 12. Second reuse zone; 2. Second wastewater tank; 3. Wastewater pump; 31. First water pump; 32. Second water pump; 41. First valve; 42. Second valve; 43. Third valve; 5. Wastewater pump outlet header; 6. Green water pipe; 7. Control valve assembly. Detailed Implementation

[0041] The technical solutions of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the scope of the invention.

[0042] In the description of this invention, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of the description and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] In the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] To facilitate understanding of the embodiments of the present invention, it should be noted that in the operation of traditional thermal power plants, most of the wastewater is reclaimed water from ion exchangers, which has a high chloride ion content. Green space water standards require a chloride ion content of less than or equal to 250 mg / L. However, the chloride ion content in ion exchanger reclaimed water can reach over 1000 mg / L, and chloride ions are difficult to remove. High salinity easily leads to soil salinization. Therefore, domestic water is often used as a source for green space water in the plant area, resulting in a significant waste of high-quality water resources. Simultaneously, the water treatment system generates a certain amount of wastewater during operation. If not utilized, this wastewater requires further treatment or discharge, increasing environmental pressure and operating costs.

[0046] While there are some studies and applications of greywater reuse in existing technologies, problems such as unstable water quality, cross-contamination in pipelines, and complex control are common in practical engineering projects. Therefore, there is an urgent need to provide a greening water system renovation solution that is simple in structure, stable in operation, and energy-saving and environmentally friendly.

[0047] Example 1

[0048] Please see Figure 1 This invention provides a water supply method for reusing process wastewater, comprising:

[0049] Obtain the target impurity content values ​​of the wastewater discharged from each workshop in the factory area.

[0050] Based on the target impurity content value, all target workshops in the factory area are screened out. The target workshops are those suitable for wastewater reuse.

[0051] Based on the drainage experience parameters of the target plants, all target plants are divided into plants with continuous wastewater discharge and plants with intermittent wastewater discharge.

[0052] Wastewater discharged from the continuous wastewater discharge plant is controlled to be stored in the first wastewater tank 1, where laminar flow is formed to achieve sedimentation and sludge removal. Wastewater discharged from the intermittent wastewater discharge plant is controlled to be stored in the second wastewater tank 2. The wastewater in the first wastewater tank 1 is used as regular water supply, and the wastewater in the second wastewater tank 2 is used as backup water supply.

[0053] Depending on the water levels in the first wastewater tank 1 and the second wastewater tank 2, the first wastewater tank 1 can be opened for separate water supply, or the first wastewater tank 1 and the second wastewater tank 2 can be opened for simultaneous water supply.

[0054] It should be noted that the wastewater reuse method in this embodiment of the invention first screens out target plants within the plant area that can reuse wastewater. The wastewater discharged from these target plants has a low target impurity content. Next, the wastewater discharged from these target plants is reused. Further, based on the drainage experience parameters of the target plants, the wastewater discharged from these target plants is stored in a first wastewater tank or a second wastewater tank. That is, based on the drainage experience parameters, the target plants are divided into two categories: continuous wastewater discharge plants and intermittent wastewater discharge plants. Continuous wastewater discharge plants can provide a relatively stable and continuous water supply. While the drainage from intermittent wastewater discharge plants can be reused, the flow rate is not stable enough; that is, the flow rate of the drainage from intermittent wastewater discharge plants fluctuates. This fluctuation in flow rate can cause turbulence or eddies to form in the storage tank, preventing the sludge in the storage tank from settling.

[0055] It is evident that the fluctuation in the flow rate of reused wastewater mainly originates from the intermittent wastewater discharge plant. Conventional single-tank sedimentation schemes are prone to flow fluctuations leading to suspended solids. This method, however, physically isolates the influent flow from the continuous and intermittent wastewater discharge plants, ensuring a relatively stable flow rate into the first wastewater tank and preventing turbulence. In other words, this method improves the stability of the flow in the first wastewater tank, maintaining laminar flow to facilitate sludge settling and stratification without affecting the regular water supply. The second wastewater tank is only supplied when the water level in the first tank is insufficient; that is, the frequency and duration of water supply to the second wastewater tank are both reduced, thus minimizing the risk of blockage in the water supply pipeline.

[0056] Furthermore, to achieve laminar flow, the inlet is positioned at the bottom of the first wastewater tank, employing a submerged inlet method. The inlet velocity is maintained at 0.2-0.25 m / s to ensure the Reynolds number in the first wastewater tank remains less than or equal to 500. Additionally, since the wastewater flow rate from the continuous wastewater discharge plant is relatively stable, conventional methods can be used to achieve a relatively stable laminar flow in the tank, which will not be elaborated upon here. The key innovation of this method lies in separating the stable flow rate from the fluctuating flow rate to ensure laminar flow is achieved in the first wastewater tank.

[0057] In summary, the wastewater reuse method of this process can effectively avoid blockage of water supply pipelines.

[0058] On the other hand, fluctuations in wastewater flow can lead to mismatches with water demand. In this method, continuous wastewater discharge is stored in a first wastewater tank, which normally supplies water to the water system. A second wastewater tank is used to store wastewater discharged from intermittent wastewater discharge plants. When the water demand of the water system increases, the supply from the first wastewater tank becomes insufficient, causing its water level to drop. At this point, the second wastewater tank is activated, working in conjunction with the first wastewater tank to supply water, thus achieving a stable water supply to the water system.

[0059] In summary, this wastewater reuse method can also ensure the stability of water supply during wastewater reuse, thereby ensuring that water supply needs are met.

[0060] In this embodiment, all target factory buildings in the plant area are screened according to the target impurity content value. Specifically, if the target impurity content value is less than or equal to the preset target concentration value, it is determined as a target factory building.

[0061] In other words, if the target impurity content of the wastewater discharged from the factory exceeds the preset target concentration value, the wastewater discharged from the factory is determined to be unsuitable for reuse. Conversely, if the target impurity content of the wastewater discharged from the factory is less than or equal to the preset target concentration value, the wastewater discharged from the factory is determined to be suitable for reuse, and thus becomes the target factory.

[0062] Taking irrigation water for greening systems as an example, in the operation of traditional thermal power plants, most of the wastewater is reclaimed water from ion exchangers, which has a high chloride ion content and cannot be used as irrigation water for greening systems. This is because high salinity easily leads to soil salinization, and the removal of chloride ions from wastewater is very costly. Only a small portion of the wastewater has a low chloride ion content, meeting the chloride ion index requirements for irrigation water in greening systems. Therefore, in the example of greening systems, the target impurity content value is the chloride ion content value.

[0063] Because chloride ions are difficult to remove and high salinity easily leads to soil salinization, wastewater with high chloride ion content is unsuitable for irrigation of greening systems. This step filters out all factory wastewater that does not meet reuse requirements, retaining wastewater with low chloride ion content discharged from factories such as ultrafiltration equipment, reverse osmosis equipment, concentrate reverse osmosis equipment, EDI units, unit drainage, and mechanical ventilation tower drainage, generally used for desulfurization water, etc. Therefore, this step facilitates subsequent tiered water supply.

[0064] For example, a preset target concentration of 250 mg / L is set, meaning that when the chloride ion content of the discharged wastewater is less than or equal to 250 mg / L, it meets the reuse standard. For instance, the chloride ion content of the wastewater discharged from cooling towers in thermal power plants is 150 mg / L, which meets the reuse standard for greening systems. However, the discharge of wastewater from cooling towers in thermal power plants fluctuates significantly, with only one to two short-term, timed discharges per day. This results in substantial fluctuations in the supply of reused wastewater.

[0065] Furthermore, the irrigation water demand of greening systems fluctuates throughout the year. For example, greening systems require more irrigation water during the non-rainy season and less during the rainy season. Therefore, the low-salinity wastewater from thermal power plants cannot currently provide a stable water supply to greening systems.

[0066] The wastewater reuse method in this process first screens out wastewater with low chloride ion content that can be reused within the plant area, and then reuses this wastewater. Further, based on the drainage experience parameters of the target plant, the wastewater discharged from the target plant is stored in either a first wastewater tank 1 or a second wastewater tank 2. That is, based on drainage experience parameters, the target plants are divided into two categories: continuous wastewater discharge plants and intermittent wastewater discharge plants. Continuous wastewater discharge plants can provide a relatively stable and continuous water supply, while the drainage from intermittent wastewater discharge plants, although reusable, is less stable. In this method, by storing the continuous wastewater in the first wastewater tank 1, water is typically supplied to the greening system through the first wastewater tank 1, while the second wastewater tank 2 is used to accumulate wastewater discharged from the intermittent wastewater discharge plants. When the demand for irrigation water for the greening system increases, the water supply of the first wastewater tank 1 is insufficient, and the water level drops. At this time, the second wastewater tank 2 is opened to participate in the water supply together with the first wastewater tank 1, so as to achieve a stable water supply to the greening system.

[0067] In this embodiment, based on the drainage experience parameters of the target plant, all target plants are divided into continuous wastewater discharge plants and intermittent wastewater discharge plants, specifically:

[0068] Based on the drainage experience parameters of each target plant, the wastewater discharge regularity index of each target plant was calculated.

[0069] If the wastewater discharge regularity index of the target plant is greater than or equal to the preset threshold, the target plant is classified as a continuous wastewater discharge plant; if the wastewater discharge regularity index of the target plant is less than the preset threshold, the target plant is classified as an intermittent wastewater discharge plant.

[0070] Specifically, a higher wastewater discharge regularity index means more stable drainage. The preset threshold can be 0.4-0.7, which can be selected according to actual needs.

[0071] Taking a preset threshold of 0.4 as an example, when the wastewater discharge regularity index of the target factory is greater than or equal to 0.4, the target factory is classified as a continuous wastewater discharge factory.

[0072] Taking a preset threshold of 0.5 as an example, when the wastewater discharge regularity index of the target factory is greater than or equal to 0.5, the target factory is classified as a continuous wastewater discharge factory.

[0073] Taking a preset threshold of 0.7 as an example, when the wastewater discharge regularity index of the target factory is greater than or equal to 0.7, the target factory is classified as a continuous wastewater discharge factory.

[0074] It should be noted that the wastewater discharge regularity index is an original design of this invention, which can effectively and automatically distinguish between continuous and intermittent wastewater discharge plants. In other words, the automated program corresponding to the above steps can be stored in an industrial control computer, thereby automatically determining whether each plant is a continuous or intermittent wastewater discharge plant, and quickly identifying and classifying multiple target plants.

[0075] Specifically, the drainage experience parameters include: the annual effective wastewater discharge duration of the plant, the total annual operating time of the plant, and the hourly flow data of the plant.

[0076] Furthermore, based on the drainage experience parameters of the target plant, the wastewater discharge regularity index of the target plant is calculated, specifically as follows:

[0077] Based on the annual effective wastewater discharge duration and the total annual operating time of the building in the drainage experience parameters, the ratio of effective wastewater discharge duration to total annual operating time is calculated.

[0078] Based on the hourly flow rate data in the drainage experience parameters, the average value and standard deviation of the hourly flow rate data of the plant are calculated;

[0079] The flow fluctuation coefficient of the factory is calculated based on the average value and standard deviation of the hourly flow data.

[0080] The wastewater discharge regularity index of the target plant is calculated based on the ratio of effective wastewater discharge time to total annual operating time and the flow fluctuation coefficient of the plant.

[0081] More specifically, the above steps, based on the wastewater discharge experience parameters of the target plant, calculate the wastewater discharge regularity index of the target plant, which can be achieved using the following formula:

[0082]

[0083] In the formula, WDRI is the wastewater discharge regularity index, T1 is the annual effective wastewater discharge duration, T2 is the annual total operating time, and cv is the flow fluctuation coefficient.

[0084] cv=σ / μ

[0085] In the formula, σ is the standard deviation of the hourly flow rate data of the plant; μ is the mean of the hourly flow rate data of the plant.

[0086] Understandably, the ratio between the annual effective wastewater discharge duration T1 and the annual total operating time T2 can reflect the continuity of wastewater discharge from the plant.

[0087] CV (Flow Rate Fluctuation Coefficient) is a parameter used to measure the degree of fluctuation in hourly flow rate. A smaller CV value indicates more stable flow; a larger CV value indicates less stable flow. The standard deviation σ is calculated by first calculating the difference between each hourly flow rate and the average flow rate, then squaring the difference, summing all the squares, dividing by the number of hours, and finally taking the square root of the result. The standard deviation σ represents the deviation between each hourly flow rate and the average flow rate.

[0088] In other words, the smaller the ratio between the standard deviation and the mean, the smaller the deviation between the hourly traffic data and the average traffic, meaning the smaller the traffic fluctuation; conversely, the larger the ratio between the standard deviation and the mean, the smaller the deviation between the hourly traffic data and the average traffic, meaning the greater the traffic fluctuation.

[0089] For example, taking a certain workshop as an example, the annual effective wastewater discharge time T1 of this workshop is 8640 hours (i.e., wastewater is continuously discharged for 360 days a year), while the annual total operating time T2 is 8760 hours (i.e., it operates all year round). The flow rate in this workshop is continuously recorded hourly for 5 hours, as follows: [24.8, 25.2, 25.1, 24.9, 25.0] m 3 / h.

[0090] The calculated average value μ = (24.8 + 25.2 + 25.1 + 24.9 + 25.0) / 5 = 25.0m 3 / h; Standard deviation σ≈0.14m 3 / h. Further, the flow fluctuation coefficient cv was calculated to be 0.0056, indicating that the flow rate of the plant is relatively stable. Finally, the wastewater discharge regularity index WDRI was calculated to be approximately 0.98, which is greater than the aforementioned preset threshold, meaning that the workshop is a continuous wastewater discharge plant.

[0091] This step effectively distinguishes between stable wastewater flow from the plant (i.e., continuous wastewater discharge) and unstable wastewater flow from the plant (intermittent wastewater discharge), thus physically isolating the influent flows from the continuous and intermittent wastewater discharge plants. This ensures that the flow rate entering the first wastewater tank remains relatively stable. In other words, this step improves the stability of the water flow in the first wastewater tank, maintaining laminar flow to facilitate sludge settling and stratification without affecting the tank's regular water supply.

[0092] In this embodiment, the first wastewater tank 1 includes a first reuse zone 11 and a second reuse zone 12. The above steps, controlling the storage of wastewater discharged from the continuous wastewater discharge plant into the first wastewater tank 1, specifically involve controlling the division of the wastewater discharged from the continuous wastewater discharge plant into equal parts to obtain a first water flow and a second water flow. The first water flow enters the first reuse zone 11, and the second water flow enters the second reuse zone 12.

[0093] It should be noted that the advantage of setting up a first reuse zone 11 and a second reuse zone 12 and simultaneously filling both zones with water is that during seasons when the demand for irrigation water in the greening system is low, water can be supplied to the greening system only through the first reuse zone 11, while during seasons when the demand for irrigation water is low, both the first and second reuse tanks can be opened at the same time.

[0094] Furthermore, when the first reuse zone 11 (and its peripheral equipment, such as the pump set and valves of the first reuse zone 11) is under maintenance or cleaned, the second reuse zone 12 can be supplied with water independently to ensure the continuity of reused water. Similarly, when the second reuse zone 12 is under maintenance and cleaned, the first reuse zone 11 can be supplied with water independently.

[0095] In this embodiment, based on the water levels in the first wastewater tank 1 and the second wastewater tank 2, the first wastewater tank 1 is activated for separate water supply, or the first wastewater tank 1 and the second wastewater tank 2 are activated for simultaneous water supply, specifically including:

[0096] Determine whether the water level in the first reuse zone 11 of the first wastewater tank 1 is lower than the target water level.

[0097] If not, then activate the first reuse zone 11 for separate water supply;

[0098] If so, then activate the synchronous water supply to the first reuse zone 11 and the second reuse zone 12, and determine whether the water level in the second reuse zone 12 is lower than the target water level:

[0099] If so, then the first reuse zone 11 of the first wastewater tank 1, the second reuse zone 12, and the second wastewater tank 2 will be opened for synchronous water supply.

[0100] It should be noted that by adopting a tiered water supply method, the stability of wastewater reuse water supply can be effectively guaranteed.

[0101] Specifically, when the irrigation water demand of the greening system is low, the second reuse zone 12 mainly serves as a water storage area, and water is supplied separately through the first reuse zone 11. When the water level in the first reuse zone 11 falls below the target water level, it can be determined that the water volume in the first reuse zone 11 is insufficient to meet the irrigation water demand of the greening system. At this time, the second reuse zone 12 is activated, and water is supplied synchronously with the first reuse zone 11. In other words, the dual-zone design can avoid the waste of continuous wastewater discharge into the plant.

[0102] Meanwhile, the second wastewater tank 2 is used to store the drainage from the intermittent wastewater discharge plant. Under normal circumstances, irrigation water is supplied through the first reuse zone 11 and the second reuse zone 12 in the first wastewater tank 1. When the water levels in the first reuse zone 11 and the second reuse zone 12 in the first wastewater tank 1 drop to the target water level, it is determined that the water volume in the first wastewater tank 1 is insufficient to meet the irrigation water demand of the greening system. At this time, the second wastewater tank 2 is opened to supply water.

[0103] By using a dual-zone design (first reuse zone 11 and second reuse zone 12 of the first wastewater tank 1) and a dual-tank design (first wastewater tank 1 and second wastewater tank 2), the water supply and irrigation needs can be effectively matched, thereby realizing the irrigation of the greening system.

[0104] The target water level can be determined based on actual conditions. Optionally, the ratio between the target water level and the maximum water level of the first and second reuse zones of the first wastewater tank can range from 0.25 to 0.35. In other words, the target water level can be determined based on the maximum water level of the reuse zones and the selected ratio.

[0105] For example, the maximum water level of both the first and second reuse zones is 5m. When the ratio is 0.25, the target water level is 1.25m; when the ratio is 0.3, the target water level is 1.50m; and when the ratio is 0.35, the target water level is 1.75m.

[0106] Please see Figure 1 The first reuse zone 11 is equipped with a first water pump 31 and a first valve 41, and the second reuse zone 12 is equipped with a second water pump 32 and a second valve 42. The second wastewater tank 2 is equipped with a third valve 43.

[0107] The first water pump 31 and the first valve 41 are used to open the first reuse zone 11 for water supply, the second water pump 32 and the second valve 42 are used to open the second reuse zone 12 for water supply, and the third valve 43 is used to open the second wastewater pool 2 for water supply.

[0108] In summary, the water supply method for wastewater reuse in this process has the following beneficial effects:

[0109] 1. It can distinguish between continuous water flow with stable flow and intermittent water flow with unstable flow, thereby achieving stratified sedimentation of wastewater and sludge, and effectively avoiding blockage of water delivery pipelines;

[0110] 2. Enables resource reuse: Fully utilizes wastewater from water treatment as a source of water for greening, reducing the amount of fresh domestic water used;

[0111] 3. Energy conservation and environmental protection: Reduces wastewater treatment load and improves the overall water resource utilization rate of the power plant;

[0112] 4. Simple structure: System modification can be completed through simple pipe connections and valve switching, resulting in a short construction period and low investment;

[0113] 5. Safe and controllable: By adding control valve group 7, the water supply flow and pressure can be flexibly adjusted. When greening is to be carried out, start wastewater pump 3 (i.e., first pump 31) or wastewater pump 3 (i.e., second pump 32), open the outlet valve of wastewater pump 3 (i.e., first valve 41) or the outlet valve of wastewater pump 3 (i.e., second valve 42), and adjust the pressure to about 0.30MPa. When the water volume of wastewater tanks 1 and 2 (i.e., first reuse zone 11 and second reuse zone 12) cannot meet the water demand for greening, start non-recurring wastewater tank 2 (i.e., second wastewater tank 2) to ensure the stable operation of the greening system.

[0114] Example 2

[0115] This invention provides an irrigation method for a greening system, comprising the following steps: treating wastewater discharged from a suitable wastewater reuse facility in a thermal power plant using the wastewater reuse method described in Example 1; and then transporting the treated wastewater to the greening system for irrigation.

[0116] By adopting the wastewater reuse water supply method described in Example 1, economic benefits are significantly improved. Based on the current situation, the original greening water source was domestic water, and the maximum flow rate of the domestic water pump outlet header during greening operations could reach 40 m³ / h. 3 The maximum water volume used for landscaping can reach 27m³. 3 / h. Assuming an average summer water supply of 13m³. 3Based on a per-hour calculation, assuming a 180-day (approximately 6-month) annual greening period and 8-hour workdays, the annual water consumption for greening would be 18,720 m³. 3 If the unit price of domestic water is 5.2 yuan, then the annual savings would be 97,300 yuan.

[0117] Example 3

[0118] According to an embodiment of a third aspect of the present invention, a water supply device for recycling process wastewater is provided, comprising: an acquisition unit, an analysis unit, a treatment unit, an inlet device, and a supply device.

[0119] The system comprises the following components: an acquisition unit, used to acquire the target impurity content values ​​of wastewater discharged from each plant within the factory area; an analysis unit, electrically connected to the acquisition unit, used to screen all target plants within the factory area based on the target impurity content values, identifying plants suitable for wastewater reuse; a treatment unit, electrically connected to both the acquisition and analysis units, used to classify all target plants into continuous wastewater discharge plants and intermittent wastewater discharge plants based on their drainage experience parameters; and an inlet system, used to control the storage of wastewater discharged from the continuous wastewater discharge plants into a first wastewater tank 1, where laminar flow is formed for sedimentation and sludge removal; and to control the storage of wastewater discharged from the intermittent wastewater discharge plants into a second wastewater tank 2. The wastewater in the first wastewater tank 1 is used for regular water supply, and the wastewater in the second wastewater tank 2 is used as backup water supply. The water supply equipment is used to either open the first wastewater tank 1 for individual water supply or open the first wastewater tank 1 and the second wastewater tank 2 for simultaneous water supply, based on the water levels in the first wastewater tank 1 and the second wastewater tank 2.

[0120] In this embodiment, the analysis unit includes a first judgment module, which is used to determine whether the target impurity content value of the wastewater discharged from each factory is greater than the preset target concentration value. If it is, the wastewater discharged from the factory is determined to be unsuitable for reuse. If it is not, the wastewater discharged from the factory is determined to be suitable for reuse. That is, the factory with the target impurity content value less than or equal to the preset target concentration value is identified as the target factory.

[0121] In this embodiment, the processing unit includes a calculation module and a second judgment module. The calculation module is used to calculate the wastewater discharge regularity index of the target factory based on the wastewater discharge experience parameters of the target factory. The second judgment module is electrically connected to the calculation module and is used to classify the target factory as a continuous wastewater discharge factory when the wastewater discharge regularity index of the target factory is greater than or equal to a preset threshold; or, when the wastewater discharge regularity index of the target factory is less than the preset threshold, classify the target factory as an intermittent wastewater discharge factory.

[0122] The drainage experience parameters include: the annual effective wastewater discharge duration of the plant, the total annual operating time of the plant, and the hourly flow rate data of the plant.

[0123] In this embodiment, the calculation module includes: a first calculation submodule, a second calculation submodule, a third calculation submodule, and a fourth calculation submodule; the first calculation submodule is used to calculate the ratio of effective wastewater discharge time to total annual operating time based on the annual effective wastewater discharge time and the total annual operating time of the plant in the drainage experience parameters; the second calculation submodule is used to calculate the average value and standard deviation of the hourly flow data of the plant based on the hourly flow data in the drainage experience parameters; the third calculation submodule is used to calculate the flow fluctuation coefficient of the plant based on the average value and standard deviation of the hourly flow data of the plant; the fourth calculation submodule is used to calculate the wastewater discharge regularity index of the target plant based on the ratio of effective wastewater discharge time to total annual operating time and the flow fluctuation coefficient of the plant.

[0124] For example, for ease of description, the workshops in a thermal power plant are divided into one or more No. 1 water treatment workshops and one or more No. 2 water treatment workshops. The wastewater produced in No. 1 water treatment workshop is high-salinity wastewater and cannot be used directly. The wastewater produced in No. 2 water treatment workshop is low-salinity wastewater and can be used for greening irrigation. No. 2 water treatment workshop can continuously discharge wastewater for extended periods.

[0125] Specifically, the water treatment equipment (wastewater discharge equipment plant) of the thermal power plant includes Water Treatment Workshop No. 1 and Water Treatment Workshop No. 2. Water Treatment Workshop No. 1 includes multi-media filters, ultrafiltration equipment, reverse osmosis equipment, cation exchangers, anion exchangers, and mixed ion exchangers. Ion exchanger regeneration is involved, and the chloride ion content exceeds 1000 mg / L. Water Treatment Workshop No. 2 includes ultrafiltration equipment, reverse osmosis equipment, concentrate reverse osmosis equipment, and EDI unit. Ion exchanger regeneration is not involved, and the chloride ion content, as tested, is around 56 mg / L, meeting the standards for greening water. Therefore, the wastewater generated in Water Treatment Workshop No. 2 is introduced into the greening system for use, replacing the original domestic water supply method, achieving efficient water resource reuse, and reducing domestic water consumption and the burden of sewage treatment.

[0126] Please see Figure 2 The water supply equipment includes: wastewater pump main pipe 5, connecting pipes, greening water main pipe valve, and control valve group 7.

[0127] Specifically, the wastewater in the wastewater collection system's wastewater tank (i.e., the first wastewater tank 1) consists of ultrafiltration drainage, primary reverse osmosis concentrate drainage, and secondary reverse osmosis concentrate drainage from Water Treatment Workshop No. 2. The wastewater pump main pipe 5 is located at the outlet of the wastewater collection system, connecting to at least one wastewater transfer pump. The connecting pipe extends from the wastewater pump main pipe 5 of Water Treatment Workshop No. 2, passes through the wall of the workshop's main hall, and connects to the original greening water branch pipe. The connecting pipe uses seamless carbon steel pipe Φ108×4, possessing excellent corrosion resistance. The greening water main pipe valve is located in the green belt valve well and will be retained as a backup after the renovation. The control valve group 7 is installed on the connecting pipe for regulating and controlling the wastewater supply to the greening system. The greening pipe network has multiple branch valves for easy zoned control and maintenance.

[0128] The treatment equipment in the No. 2 water treatment workshop ensures that the wastewater quality meets the requirements of the standard "Urban Wastewater Reuse for Green Space Irrigation Water Quality" (GB / T 25499-2010).

[0129] Wastewater reuse ponds 1 and 2 (i.e., the first reuse zone 11 and the second reuse zone 12) collect wastewater from the No. 2 water treatment workshop; non-recurring wastewater pond 2 (i.e., the second wastewater pond 2) collects drainage from the generating units and the mechanical ventilation tower, and is generally used for desulfurization. If the water used for landscaping in wastewater ponds 1 and 2 is insufficient, the wastewater from non-recurring wastewater pond 2 can be used.

[0130] Because the original greening water used domestic water, the greening water distribution pipe (i.e., greening water pipe 6) was branched off to greening according to the domestic water main valve. In order not to damage the original greening water distribution pipe, firstly, to save costs; secondly, to ensure that the greening water pressure meets the standard after the greening water is modified and can be used for irrigation; and thirdly, to study the connection of the pipeline to the No. 2 water treatment workshop without damaging the road. Finally, the connection was made to the greening water branch pipeline outside the hall of the No. 2 water treatment workshop. The pressure of the wastewater pump 3 was adjusted multiple times to meet the greening water pressure standard.

[0131] Furthermore, a wastewater collection point will be set up at the end of Water Treatment Workshop No. 2 to collect wastewater from ultrafiltration, reverse osmosis concentrate, and EDI. A wastewater pump main pipe 5 will be installed, connected to a wastewater transfer pump to transport the wastewater to the green area. Connecting pipes will extend from the wastewater pump main pipe 5, running along the north wall of the plant area and the west wall of the lobby, ultimately penetrating the walls to connect to the green area water branch pipes. Control valve assembly 7 will be installed on the connecting pipes to regulate the water supply pressure. Wastewater quality will be monitored regularly, and filtration facilities will be added as needed to ensure the safety of water used for greening.

[0132] The above structure enables the switching of domestic water to water used for greening from wastewater from water treatment facilities, thus achieving the goal of energy conservation and consumption reduction.

[0133] Example 4

[0134] According to an embodiment of the fourth aspect of the present invention, an irrigation system for a greening system is provided, which employs the above-mentioned process wastewater recycling water supply device. The process wastewater recycling water supply device is used to transport wastewater discharged from the plant buildings in a thermal power plant that are suitable for wastewater recycling to the greening system for irrigation.

[0135] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A water supply method for reusing process wastewater, characterized in that, include: Obtain the target impurity content values ​​of the wastewater discharged from each plant in the factory area; Based on the target impurity content value, all target factory buildings in the factory area are screened out. The target factory buildings are those suitable for wastewater reuse. Based on the drainage experience parameters of the target plants, all target plants are divided into continuous wastewater discharge plants and intermittent wastewater discharge plants. The system controls the storage of wastewater discharged from the continuous wastewater discharge plant into a first wastewater tank, where laminar flow is formed for sedimentation and sludge removal. The system also controls the storage of wastewater discharged from the intermittent wastewater discharge plant into a second wastewater tank, where the wastewater in the first wastewater tank is used for regular water supply and the wastewater in the second wastewater tank is used for backup water supply. Depending on the water levels in the first and second wastewater tanks, the first wastewater tank can be opened for separate water supply, or the first and second wastewater tanks can be opened for simultaneous water supply.

2. The water supply method for reusing process wastewater according to claim 1, characterized in that, The step of selecting all target factory buildings in the factory area based on the target impurity content value is as follows: If the target impurity content value is less than or equal to the preset target concentration value, then it is determined to be the target plant.

3. The water supply method for reusing process wastewater according to claim 1, characterized in that, Based on the drainage experience parameters of the target plants, all target plants are divided into continuous wastewater discharge plants and intermittent wastewater discharge plants, specifically: Based on the drainage experience parameters of each target plant, the wastewater discharge regularity index of each target plant was calculated. If the wastewater discharge regularity index of the target plant is greater than or equal to a preset threshold, then the target plant is classified as a continuous wastewater discharge plant. If the wastewater discharge regularity index of the target plant is less than a preset threshold, the target plant is classified as an intermittent wastewater discharge plant.

4. The water supply method for reusing process wastewater according to claim 3, characterized in that, The drainage experience parameters include: the annual effective wastewater discharge duration of the plant, the total annual operating time of the plant, and the hourly flow rate data of the plant.

5. The water supply method for reusing process wastewater according to claim 4, characterized in that, The wastewater discharge regularity index of the target factory is calculated based on the drainage experience parameters of the target factory, specifically as follows: Based on the annual effective wastewater discharge duration and the annual total operating time of the factory building in the aforementioned drainage experience parameters, the ratio of effective wastewater discharge duration to annual total operating time is calculated. Based on the hourly flow rate data in the aforementioned drainage empirical parameters, the average value and standard deviation of the plant's hourly flow rate data are calculated. The flow fluctuation coefficient of the factory is calculated based on the average value and standard deviation of the hourly flow data of the factory. Based on the ratio of the effective wastewater discharge time to the total annual operating time, and the flow fluctuation coefficient of the plant, the wastewater discharge regularity index of the target plant is calculated.

6. The water supply method for reusing process wastewater according to claim 1, characterized in that, The first wastewater tank includes a first reuse zone and a second reuse zone. The control process involves storing the wastewater discharged from the continuous wastewater discharge plant into a first wastewater tank, specifically as follows: The wastewater discharged from the continuous wastewater discharge plant is divided into a first flow and a second flow. The first flow enters the first reuse zone, and the second flow enters the second reuse zone.

7. The water supply method for reusing process wastewater according to claim 6, characterized in that, The step of activating the first wastewater tank for independent water supply or activating both the first and second wastewater tanks for simultaneous water supply, based on the water levels in the first and second wastewater tanks, specifically includes: Determine whether the water level in the first reuse zone of the first wastewater tank is lower than the target water level. If not, then the first reuse zone will be activated for separate water supply; If so, then synchronize water supply to the first reuse zone and the second reuse zone, and determine whether the water level in the second reuse zone is lower than the target water level: If so, then the first reuse zone, the second reuse zone, and the second wastewater tank of the first wastewater tank will be opened for synchronous water supply.

8. A method for irrigating a greening system, characterized in that, include: The water supply method for process wastewater reuse according to any one of claims 1 to 7 is used to treat wastewater discharged from plant buildings in thermal power plants that are suitable for wastewater reuse. The treated wastewater is then transported to the greening system for irrigation.

9. A water supply device for recycling process wastewater, characterized in that, include: Acquisition unit, analysis unit, processing unit, water inlet equipment, and water supply equipment; The acquisition unit is used to acquire the target impurity content value of the wastewater discharged from each workshop in the factory area. The analysis unit is electrically connected to the acquisition unit and is used to screen out all target factory buildings in the factory area based on the target impurity content value. The target factory buildings are those suitable for wastewater reuse. The processing unit is electrically connected to the acquisition unit and the analysis unit, and is used to classify all target plants into continuous wastewater discharge plants and intermittent wastewater discharge plants according to the drainage experience parameters of the target plants. The water inlet device is used to control the storage of wastewater discharged from the continuous wastewater discharge plant into a first wastewater tank, forming laminar flow in the first wastewater tank for sedimentation and sludge removal, and to control the storage of wastewater discharged from the intermittent wastewater discharge plant into a second wastewater tank. The wastewater in the first wastewater tank is used as regular water supply, and the wastewater in the second wastewater tank is used as backup water supply. The water supply equipment is used to either activate the first wastewater tank for individual water supply or activate both the first and second wastewater tanks for simultaneous water supply, depending on the water levels in the first and second wastewater tanks.

10. The water supply device for process wastewater reuse according to claim 9, characterized in that, The analysis unit includes a first judgment module. The first judgment module is used to determine the factory with the target impurity content value being less than or equal to the preset target concentration value as the target factory.

11. The water supply device for process wastewater reuse according to claim 10, characterized in that, The processing unit includes a calculation module and a second judgment module; The calculation module is used to calculate the wastewater discharge regularity index of the target factory building based on the drainage experience parameters of the target factory building. The second judgment module is electrically connected to the calculation module and is used to classify the target factory as a continuous wastewater discharge factory when the wastewater discharge regularity index of the target factory is greater than or equal to a preset threshold. or, When the wastewater discharge regularity index of the target plant is less than a preset threshold, the target plant is classified as an intermittent wastewater discharge plant.

12. The water supply device for process wastewater reuse according to claim 11, characterized in that, The drainage experience parameters include: the annual effective wastewater discharge duration of the plant, the total annual operating time of the plant, and the hourly flow rate data of the plant. The computing module includes: a first computing submodule, a second computing submodule, a third computing submodule, and a fourth computing submodule; The first calculation submodule is used to calculate the ratio of effective wastewater discharge time to total annual operating time based on the annual effective wastewater discharge time and the annual total operating time of the factory in the drainage experience parameters. The second calculation submodule is used to calculate the average value and standard deviation of the plant's hourly flow rate data based on the hourly flow rate data in the drainage empirical parameters. The third calculation submodule is used to calculate the flow fluctuation coefficient of the factory based on the average value and standard deviation of the hourly flow data of the factory. The fourth calculation submodule is used to calculate the wastewater discharge regularity index of the target plant based on the ratio of the effective wastewater discharge time to the total annual operating time and the flow fluctuation coefficient of the plant.

13. An irrigation system for a greening system, characterized in that, The water supply device for process wastewater reuse according to any one of claims 9 to 12 The wastewater recycling water supply device is used to transport wastewater discharged from the plant buildings in the thermal power plant that are suitable for wastewater recycling to the greening system for irrigation.

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