High-salinity wastewater resource utilization system

Abstract

The utility model provides a high-salinity wastewater resource utilization system. The high-salinity wastewater resource utilization system comprises a high-salinity wastewater input device, a pretreatment unit, a fluorine ion dilution unit, a liquid mixing device and a regeneration unit, the pretreatment unit and the fluorine ion dilution unit are both connected with the liquid mixing device; a first fluorine ion detector and a first flow meter are arranged between the pretreatment unit and the liquid mixing device, and a second fluorine ion detector and a second flow meter are arranged between the fluorine ion dilution unit and the liquid mixing device; and the regeneration unit is communicated with the liquid mixing device, electrolyzes to generate an electrolysis product, and collects and utilizes the electrolysis product. The system has the advantages of being small in number of devices, simple to operate, low in investment and operation cost, convenient to maintain, small in occupied area, capable of achieving zero emission of solid waste to the maximum extent, high in resource utilization rate and the like, and the content of total fluorine ions entering a regeneration unit can be intelligently regulated and controlled not to exceed the maximum value all the time. And the problems of low electrolysis efficiency, short service life and high maintenance cost caused by corrosion of devices in the regeneration unit by fluorine ions are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field especially is related to a kind of high-salinity wastewater resource utilization system. BACKGROUND

[0002] High-salinity wastewater is one of the most difficult end wastewater to be treated in coastal thermal power plants, with characteristics of complex water quality, large fluctuation, etc. The existing high-salinity wastewater zero discharge system generally includes multiple process steps such as pretreatment, concentration reduction, and end solidification. The core technology mainly includes evaporation crystallization technology and flue gas waste heat drying technology. Among them, the evaporation crystallization technology realizes high-purity crystalline salt and recovered water by deep treatment of high-salinity wastewater through evaporation crystallization equipment. The flue gas waste heat drying technology dries high-salinity wastewater using boiler flue gas waste heat, and comprehensively utilizes the dried product. Although the high-salinity wastewater zero discharge technology has made certain progress, it still faces challenges such as immature technology, high investment and operation cost, complex process, long processing time, etc. The application rate of high-salinity wastewater treatment in coastal thermal power plants is not high enough. Therefore, there is an urgent need for a high-salinity wastewater resource utilization system that is more suitable for coastal thermal power plants, has low cost, is easy to operate and manage, and has high reliability. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a high-salinity wastewater resource utilization system, which solves the problems of complex process flow, high cost, and low reliability of existing high-salinity wastewater treatment in coastal thermal power plants.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A high-salinity wastewater resource utilization system includes a high-salinity wastewater input device, a pretreatment unit, a fluoride ion dilution unit, a liquid mixing device, and a regeneration unit.

[0006] The high-salinity wastewater input device is in communication with the pretreatment unit. The pretreatment unit and the fluoride ion dilution unit are connected to the liquid mixing device to dilute the fluoride ion concentration in high-salinity wastewater.

[0007] A first fluoride ion detection meter and a first flow meter are provided between the pretreatment unit and the liquid mixing device. A second fluoride ion detection meter and a second flow meter are provided between the fluoride ion dilution unit and the liquid mixing device. The fluoride ion dilution unit adjusts the flow based on the detection results of the first fluoride ion detection meter and the second fluoride ion detection meter.

[0008] The inlet end of the regeneration unit is in communication with the outlet end of the liquid mixing device, for electrolysis of high-salinity wastewater after dilution of fluoride ions to generate electrolysis products and collection for utilization.

[0009] Further, the fluorine ion dilution unit comprises a seawater input assembly and a seawater treatment assembly connected in sequence.

[0010] Further, the seawater treatment assembly comprises a first filter device, an outlet end of the first filter device being communicated with an inlet end of the mixing device, the second fluorine ion detection meter and the second flow meter being arranged on a pipeline communicated between the first filter device and the mixing device, and an inlet end of the first filter device being communicated with the seawater input assembly.

[0011] Further, the seawater input assembly comprises a seawater booster pump and a first electric valve.

[0012] Further, the pretreatment unit comprises a second filter device, an outlet end of the second filter device being communicated with an inlet end of the mixing device, the first fluorine ion detection meter and the first flow meter being arranged on a pipeline communicated between the second filter device and the mixing device.

[0013] Further, the pretreatment unit further comprises a pretreatment device and a waste water storage pool, the high-salinity waste water input device comprises a waste water lifting pump and a second electric valve, an inlet end of the pretreatment device is connected with the waste water lifting pump through a pipeline, an outlet end of the pretreatment device is connected with an inlet end of the waste water storage pool, and an outlet end of the waste water storage pool is communicated with an inlet end of the second filter device through a pipeline provided with a water supply pump and a third electric valve.

[0014] Further, a first online suspended substance meter is arranged on a pipeline between the pretreatment unit and the mixing device, and a second online suspended substance meter is arranged on a pipeline between the fluorine ion dilution unit and the mixing device.

[0015] Further, the regeneration unit comprises an electrolysis device and a collection device, an inlet end of the electrolysis device being communicated with an outlet end of the mixing device, and an outlet end of the electrolysis device being communicated with an inlet end of the collection device.

[0016] In summary, compared with the prior art, the utility model has at least the following beneficial effects:

[0017] The utility model provides a kind of high-salinity wastewater resource utilization system, including high-salinity wastewater input device, front processing unit, fluoride ion dilution unit, mixed liquid device and regeneration unit;The high-salinity wastewater input device with the front processing unit intercommunication, the front processing unit with the fluoride ion dilution unit all with the mixed liquid device connection, to dilute fluoride ion concentration in high-salinity wastewater;First fluoride ion detection meter and first flowmeter are equipped between the front processing unit with the mixed liquid device, second fluoride ion detection meter and second flowmeter are equipped between the fluoride ion dilution unit with the mixed liquid device, the fluoride ion dilution unit is based on the detection result of first fluoride ion detection meter and second fluoride ion detection meter and adjusts flow;The import end of the regeneration unit with the outlet end of the mixed liquid device intercommunication, for diluting fluoride ion after high-salinity wastewater electrolysis and collection and utilization Electrolysis product is generated.Compared with traditional high-salinity wastewater treatment system, the system has the advantages of less device quantity, simple operation, low investment cost, low operating cost, easy maintenance, small floor area, maximum realization of solid waste zero discharge and resource utilization rate etc.And by detecting fluoride ion content and water flow of wastewater and diluent, the total fluoride ion content entering the regeneration unit is always not more than maximum value by intelligent control, avoid the problem that fluoride ion concentration is too high to form corrosion to internal device of regeneration unit, and then lead to low electrolysis efficiency, short service life and high maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in prior art, the following will briefly introduce the drawings needed to be used in specific embodiments or prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0019] Figure 1 It is the structural schematic diagram of high-salinity wastewater resource utilization system provided in one embodiment of the utility model.

[0020] Mark explanation:

[0021] 1, high-salinity wastewater input device;11, wastewater booster pump;12, second electric valve;

[0022] 2, front processing unit;21, second filter device;22, pretreatment device;23, wastewater storage pool;24, water supply pump;25, third electric valve;

[0023] 3, fluoride ion dilution unit;31, seawater input assembly;311, seawater booster pump;312, first electric valve;32, seawater treatment assembly;321, first filter device;

[0024] 4, mixing device;

[0025] 5, regeneration unit; 51, electrolytic device; 52, collection device;

[0026] 61, first fluoride ion detection meter; 62, first flow meter; 63, second fluoride ion detection meter; 64, second flow meter; 65, first online suspended matter meter; 66, second online suspended matter meter. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] As shown in the accompanying drawings, Figure 1 A high-salinity wastewater resource utilization system, comprising a high-salinity wastewater input device 1, a pretreatment unit 2, a fluoride ion dilution unit 3, a mixing device 4 and a regeneration unit 5; the high-salinity wastewater input device 1 is in communication with the pretreatment unit 2, the pretreatment unit 2 and the fluoride ion dilution unit 3 are both connected with the mixing device 4, so as to dilute the fluoride ion concentration in the high-salinity wastewater;

[0031] The first fluoride ion detection meter 61 and the first flow meter 62 are arranged between the pretreatment unit 2 and the mixing device 4, and the second fluoride ion detection meter 63 and the second flow meter 64 are arranged between the fluoride ion dilution unit 3 and the mixing device 4, and the fluoride ion dilution unit 3 adjusts the flow rate based on the detection results of the first fluoride ion detection meter 61 and the second fluoride ion detection meter 63;

[0032] The inlet end of the regeneration unit 5 is communicated with the outlet end of the mixing device 4, for electrolyzing the high-salinity wastewater after dilution of fluoride ions to generate electrolysis products and collecting the utilization.

[0033] Specifically, the high-salinity wastewater first enters the pretreatment unit 2 through the high-salinity wastewater input device 1 to reduce impurities such as suspended solids and heavy metal ions contained in the high-salinity wastewater, and then the pretreated wastewater flows into the mixing device 4, and at the same time, the dilution liquid treated by the fluoride ion dilution unit 3 enters the mixing device 4 together, the mixing device 4 mixes the wastewater and the dilution liquid to dilute the wastewater, and further reduces the concentration of fluoride ions contained in the wastewater, so that it meets the operation process requirements of the subsequent regeneration unit 5, avoids the corrosion of high fluoride ion concentration to the internal devices of the regeneration unit 5, and finally the mixed wastewater from the mixing device 4 enters the regeneration unit 5 for electrolysis to obtain electrolysis products and collect them, realize in-plant recycling, and maximize the resource utilization and solid waste zero discharge. Further, in order to accurately control the fluoride ion content of the diluted high-salinity wastewater entering the regeneration unit 5, when the system is running, the first fluoride ion detection meter 61 detects the fluoride ion content in the wastewater flowing out of the pretreatment unit 2 in real time, the first flow meter 64 detects the flow rate of the wastewater flowing out of the pretreatment unit 2 in real time, the second fluoride ion detection meter 63 detects the fluoride ion content in the dilution liquid flowing out of the fluoride ion dilution unit 3 in real time, and the second flow meter 64 detects the flow rate of the dilution liquid flowing out of the fluoride ion dilution unit 3 in real time. When the total fluoride ion content in the wastewater flowing out of the pretreatment unit 2 is too high, the system automatically reduces the flow rate of the dilution liquid flowing out of the fluoride ion dilution unit 3, and when the total fluoride ion content in the wastewater flowing out of the pretreatment unit 2 is too low, the flow rate of the dilution liquid can be adjusted or appropriately increased. Overall, the supply amount of the dilution liquid is automatically adjusted based on the detection results of the wastewater, so that the total fluoride ion content in the mixing device 4 is always kept below the maximum value required by the process of the regeneration unit 5, avoiding the corrosion of high fluoride ion concentration to the internal devices of the regeneration unit 5 and the problems of low electrolysis efficiency and high maintenance cost caused by high fluoride ion concentration. In addition, compared with the traditional high-salinity wastewater treatment system, the system has the advantages of fewer devices, simple operation, low investment cost, low operation cost, convenient maintenance, small occupied area, etc., and can effectively improve the economy.

[0034] In some embodiments of the present application, the dilution liquid is preferably seawater, because the seawater is easily accessible and has no transportation and acquisition costs due to the proximity of the coastal thermal power plant to the sea. The fluorine ion dilution unit 3 comprises a seawater input assembly 31 and a seawater treatment assembly 32 connected in sequence, the input end of the seawater input assembly 31 is in communication with seawater, and the seawater is transported to the seawater treatment assembly 32 through the seawater input assembly 31 for suspended matter and impurity treatment, and then enters the mixing device 4 to mix with the pretreated high-salinity wastewater to dilute the wastewater.

[0035] In some embodiments of the present application, the seawater treatment assembly 32 comprises a first filter device 321 for removing impurities such as suspended matter and particulate matter in seawater to prevent pipe blockage or damage to internal devices in the regeneration unit 5. The first filter device 321 can be any one of a sand filter, a multi-media filter, or other seawater filtration devices, which are not limited herein. The outlet end of the first filter device 321 is in communication with the inlet end of the mixing device 4, and the second fluorine ion detection meter 63 and the second flow meter 64 are arranged on the pipeline in communication between the first filter device 321 and the mixing device 4. The filtered seawater is adjusted in flow according to the detection results and calculation results of the fluorine ion content and flow, and then flows into the mixing device 4. The inlet end of the first filter device 321 is in communication with the seawater input assembly 31, which facilitates direct filtration and purification of the introduced seawater to ensure the continuity of the system.

[0036] In some embodiments of the present application, the seawater input assembly 31 comprises a seawater booster pump 311 and a first electric valve 312. The first electric valve 312 accurately adjusts the opening of the valve according to real-time calculation results to intelligently control the flow of seawater. The seawater is transported to the first filter device 321 through the first electric valve 312 by the seawater booster pump 311. Preferably, the seawater booster pump 311 is equipped with a frequency converter, which can flexibly adjust the seawater delivery amount according to demand.

[0037] In some embodiments of the present application, the pretreatment unit 2 comprises a second filter device 21 for removing impurities such as suspended matter and particulate matter in high-salinity wastewater to prevent pipe blockage or damage to internal devices in the regeneration unit 5. Preferably, the second filter device 21 is a self-cleaning filter. The outlet end of the second filter device 21 is in communication with the inlet end of the mixing device 4, and the first fluorine ion detection meter 61 and the first flow meter 62 are arranged on the pipeline in communication between the second filter device 21 and the mixing device 4. The filtered wastewater is adjusted in flow according to the detection results and calculation results of the fluorine ion content and flow, and then flows into the mixing device 4 for dilution.

[0038] In some embodiments of the present application, the pre-treatment unit 2 further comprises a pre-treatment device 22 and a wastewater storage tank 23, the high-salinity wastewater input device 1 comprises a wastewater booster pump 11 and a second electric valve 12, the inlet end of the pre-treatment device 22 is connected to the wastewater booster pump 11 through a pipeline, the outlet end of the pre-treatment device 22 is connected to the inlet end of the wastewater storage tank 23, and the outlet end of the wastewater storage tank 23 is connected to the inlet end of the second filter device 21 through a pipeline provided with a feed water pump 24 and a third electric valve 25.

[0039] Specifically, the high-salinity wastewater is first extracted by the wastewater booster pump 11, and after the flow rate is adjusted by the second electric valve 12, the high-salinity wastewater is transported into the pre-treatment device 22, which can be any one of a triple-tank process and a high-efficiency cyclone clarifier integrated device, to neutralize, react, flocculate, precipitate, and the like, so as to remove most of the heavy metal ions and suspended matters in the water, so that the wastewater meets the requirements of the “Wastewater Quality Control Index for Limestone-gypsum Wet FGD in Thermal Power Plants (DL / T997-2006)”. The treated wastewater is stored in the wastewater storage tank 23 for later use. When the wastewater needs to be treated, the treated wastewater is transported into the second filter device 21 by the feed water pump 24 for subsequent filtration treatment.

[0040] In some embodiments of the present application, in order to prevent the equipment of the regeneration unit 5 from being damaged by suspended matters and reducing the service life, and to prevent the pipeline from being blocked, it is necessary to monitor the content of suspended matters and particles flowing into the mixing device 4 in real time, so as to ensure that the quality of the mixed liquid meets the requirements of entering the regeneration unit 5. Therefore, a first online suspended matter meter 65 is further arranged on the pipeline between the pre-treatment unit 2 and the mixing device 4, for detecting the content of suspended matters in the wastewater filtered by the second filter device 21 entering the mixing device 4. A second online suspended matter meter 66 is further arranged on the pipeline between the fluorine ion dilution unit 3 and the mixing device 4, for detecting the content of suspended matters in the seawater filtered by the first filter device 321 entering the mixing device 4. When the content of suspended matters detected by the first online suspended matter meter 65 or the second online suspended matter meter 66 exceeds the set value, the corresponding second filter device 21 or first filter device 321 can be accurately located as the problem equipment. By timely repairing the problem equipment, the equipment of the regeneration unit 5 can be effectively prevented from being damaged by suspended matters and reducing the service life, and the pipeline can be prevented from being blocked, thereby reducing the labor cost and maintenance cost.

[0041] In some embodiments of the present application, the regeneration unit 5 comprises an electrolysis device 51 and a collection device 52, the inlet end of the electrolysis device 51 is communicated with the outlet end of the mixing device 4, and the outlet end of the electrolysis device 51 is communicated with the inlet end of the collection device 52. Specifically, the wastewater diluted by the mixing device 4 enters the electrolysis device 51 to generate electrolysis product sodium hypochlorite by electrolysis, and is collected and stored by the collection device 52 for subsequent on-site reuse, such as reuse in the pretreatment device 22 for sterilization of high-salinity wastewater, maximizing resource utilization and solid waste zero discharge, making the high-salinity wastewater treatment process more environmentally friendly and more economical.

[0042] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A high-salinity wastewater resource utilization system, characterized in that, The application relates to a high-salt wastewater electrolysis device, which comprises a high-salt wastewater input device, a pretreatment unit, a fluorine ion dilution unit, a mixing device and a regeneration unit. The high-salt wastewater input device is communicated with the pretreatment unit, and the pretreatment unit and the fluorine ion dilution unit are connected with the mixing device to dilute the fluorine ion concentration in the high-salt wastewater. A first fluorine ion detection meter and a first flow meter are arranged between the pretreatment unit and the mixing device, and a second fluorine ion detection meter and a second flow meter are arranged between the fluorine ion dilution unit and the mixing device; the fluorine ion dilution unit adjusts the flow based on the detection results of the first fluorine ion detection meter and the second fluorine ion detection meter. The inlet end of the regeneration unit is communicated with the outlet end of the mixing device, and is used for electrolyzing the high-salt wastewater after the fluorine ion is diluted to generate electrolysis products and collecting the electrolysis products.

2. The high-salinity wastewater resource utilization system of claim 1, wherein, The fluorine ion dilution unit comprises a seawater input assembly and a seawater treatment assembly which are connected in sequence.

3. The high-salinity wastewater resource utilization system of claim 2, wherein The seawater treatment assembly comprises a first filter device, the outlet end of the first filter device is communicated with the inlet end of the mixing device, the second fluorine ion detection meter and the second flow meter are arranged on a pipeline which is communicated between the first filter device and the mixing device, and the inlet end of the first filter device is communicated with the seawater input assembly.

4. The high-salinity wastewater resource utilization system of claim 3, wherein, The seawater input assembly comprises a seawater booster pump and a first electric valve.

5. The high-salinity wastewater resource utilization system of claim 1, wherein The pretreatment unit comprises a second filter device, the outlet end of the second filter device is communicated with the inlet end of the mixing device, and the first fluorine ion detection meter and the first flow meter are arranged on a pipeline which is communicated between the second filter device and the mixing device.

6. The high-salinity wastewater resource utilization system of claim 5, wherein, The pretreatment unit further comprises a pretreatment device and a wastewater storage pool, the high-salt wastewater input device comprises a wastewater lifting pump and a second electric valve, the inlet end of the pretreatment device is connected with the wastewater lifting pump through a pipeline, the outlet end of the pretreatment device is connected with the inlet end of the wastewater storage pool, and the outlet end of the wastewater storage pool is communicated with the inlet end of the second filter device through a pipeline which is provided with a water supply pump and a third electric valve.

7. The high-salinity wastewater resource utilization system of claim 1, wherein A first online suspended substance meter is further arranged on the pipeline between the pretreatment unit and the mixing device, and a second online suspended substance meter is further arranged on the pipeline between the fluorine ion dilution unit and the mixing device.

8. The high-salinity wastewater resource utilization system of claim 1, wherein, The regeneration unit comprises an electrolysis device and a collecting device, the inlet end of the electrolysis device is communicated with the outlet end of the mixing device, and the outlet end of the electrolysis device is communicated with the inlet end of the collecting device.

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