Novel evaporation pond wastewater treatment system
By connecting the air float module, fluorine removal module, silicon removal module, multi-media module, etc. in the evaporation pond wastewater treatment system, the problem of insufficient disposal of high concentration brine in the chemical plant is solved, and resource-based treatment is achieved and leakage risk is reduced. Ensure environmental quality.
Patent Information
- Application Number
- CN202420894414.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-04-26
AI Technical Summary
In the prior art, the high concentration of brine produced by chemical plants has not been properly disposed of, resulting in leakage risk in the evaporation pond and a large environmental risk.
A new type of evaporation pond wastewater treatment system was designed, including air float module, fluorine removal and silicon removal module, multi-media module, ultrafiltration module, decarbonization module, nanofiltration module, DTRO module, sodium chloride evaporation crystallization module and mixed salt Modules, through these modules, are connected in turn to form a complete treatment system, remove pollutants in wastewater, realize resource-based treatment and reduce leakage risks.
The resource treatment of wastewater in evaporation ponds has been realized, the overall resource rate has been improved, the leakage risk has been reduced, and environmental quality has been ensured.
Smart Images
Figure CN222226124U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the application field of evaporation pond wastewater treatment, in particular to a novel evaporation pond wastewater treatment system. Background Art
[0002] In the existing technology, when the water treatment technology is not mature, the highly concentrated brine produced by chemical plants is not properly disposed of, resulting in a large amount of wastewater being discharged into evaporation ponds. Evaporation ponds are a treatment method that uses natural forces such as solar energy and wind energy to evaporate wastewater. They are the earliest typical natural evaporation technology used to treat highly concentrated brine in the chemical industry. However, evaporation ponds have the risk of leakage and great environmental risks.
[0003] How to solve the above problems is an issue that needs to be considered urgently at this stage.
[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Utility Model Content
[0005] In order to solve the above technical problems, the utility model proposes a new evaporation pond wastewater treatment system to achieve the purpose of resource utilization of evaporation pond wastewater, improve the overall resource utilization rate, reduce leakage risks and ensure environmental quality.
[0006] In order to achieve the above object, the technical solution of the utility model is as follows:
[0007] A novel evaporation pond wastewater treatment system comprises an air flotation module, a fluorine removal and silicon removal module, a multi-media module, an ultrafiltration module, a decarbonization module, a nanofiltration module, a DTRO module, a sodium chloride evaporation and crystallization module and a salt mixing module which are connected in sequence;
[0008] The air flotation module is connected to an external evaporation pond, and PFS and PAM agents are added into the air flotation module to remove residual flocs; the salt mixing module is connected to the fluorine removal and silicon removal module.
[0009] The utility model forms a complete treatment system by sequentially connecting a flotation module, a fluorine removal and silicon removal module, a multi-media module, an ultrafiltration module, a decarbonization module, a nanofiltration module, a DTRO module, a sodium chloride evaporation crystallization module and a salt mixing module, thereby achieving the purpose of resource utilization of evaporation pond wastewater, improving the overall resource utilization rate, reducing leakage risks and ensuring environmental quality.
[0010] It is further worth noting that the nanofiltration module is also connected to the denitrification module; the denitrification module generates gypsum products that can be recycled by adding calcium salt.
[0011] It is further worth noting that the multi-media module is also connected to a hardness removal module, which removes excess calcium ions by adding a hardness removal agent and simultaneously returns the hardness removal effluent to the multi-media module.
[0012] It is further worth noting that the mixed salt module is also connected to a mixed salt module, and the mixed salt module separates and processes the mixed salt.
[0013] It is further worth noting that it also includes a water production RO module, which is connected to the DTRO module, the sodium chloride evaporation crystallization module and the salt mixing module respectively; the water production RO module can recycle the water produced by the DTRO module, the sodium chloride evaporation crystallization module and the salt mixing module, and re-transmit it to the DTRO module.
[0014] It is further worth noting that the sodium chloride evaporation and crystallization module is also connected to a centrifugal drying module to recover the sodium chloride.
[0015] The utility model has the following advantages:
[0016] 1. The utility model forms a complete treatment system by sequentially connecting a flotation module, a fluorine removal and silicon removal module, a multi-media module, an ultrafiltration module, a decarbonization module, a nanofiltration module, a DTRO module, a sodium chloride evaporation crystallization module and a salt mixing module, so as to achieve the purpose of resource utilization of evaporation pond wastewater, improve the overall resource utilization rate, reduce the risk of leakage and ensure environmental quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.
[0018] Figure 1 A system block diagram of a novel evaporation pond wastewater treatment system disclosed in an embodiment of the utility model;
[0019] The numbers and letters in the figure represent the corresponding component names:
[0020] 1. Air flotation module 2. Fluorine removal and silicon removal module 3. Multi-media module 4. Ultrafiltration module 5. Decarbonization module
[0021] 6. Nanofiltration module 7. DTRO module 8. Sodium chloride evaporation crystallization module 9. Salt mixing module
[0022] 10. Water production RO module 11. Destocking module 12. Hardness removal module 13. Miscellaneous salt module 14. Centrifugal drying module DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0024] The utility model provides a novel evaporation pond wastewater treatment system, whose working principle is to form a complete treatment system by connecting a flotation module, a fluorine removal and silicon removal module, a multi-media module, an ultrafiltration module, a decarbonization module, a nanofiltration module, a DTRO module, a sodium chloride evaporation crystallization module and a salt mixing module in sequence, so as to achieve the purpose of resource utilization of evaporation pond wastewater, improve the overall resource utilization rate, reduce leakage risk and ensure environmental quality.
[0025] The present invention is further described in detail below in conjunction with embodiments and specific implementation methods.
[0026] like Figure 1 As shown, a novel evaporation pond wastewater treatment system comprises an air flotation module 1, a fluorine removal and silicon removal module 2, a multi-media module 3, an ultrafiltration module 4, a decarbonization module 5, a nanofiltration module 6, a DTRO module 7, a sodium chloride evaporation and crystallization module 8, a salt mixing module 9 and a water production RO module 10 which are connected in sequence;
[0027] The air flotation module is connected to an external evaporation pond, and PFS and PAM agents are added into the air flotation module to remove residual flocs; the salt mixing module is connected to the fluorine removal and silicon removal module.
[0028] The nanofiltration module is also connected to the denitrification module 11; the denitrification module generates gypsum products that can be recycled by adding calcium salt.
[0029] The multi-media module is also connected to a hardness removal module 12, which removes excess calcium ions by adding a hardness removal agent and returns the hardness removal water to the multi-media module.
[0030] The mixed salt module is also connected to a mixed salt module 13, and the mixed salt module separates and processes the mixed salt.
[0031] The water production RO module is connected to the DTRO module, the sodium chloride evaporation crystallization module and the salt mixing module respectively; the water production RO module can recycle the water produced by the DTRO module, the sodium chloride evaporation crystallization module and the salt mixing module, and retransmit it to the DTRO module.
[0032] The sodium chloride evaporation and crystallization module is also connected to a centrifugal drying module 14 to recover the sodium chloride.
[0033] The specific use steps of the utility model are as follows: Figure 1 As shown, the specific process is as follows:
[0034] 1. Since the evaporation pond is exposed to the sun outdoors for a long time, the raw water may contain large algae or other microorganisms. Therefore, sodium hypochlorite is first added to destroy the algae and microorganisms and then all of them enter the flotation module 1. Then, PFS and PAM agents are added to remove residual flocs to reduce the subsequent fouling of the subsequent membrane system by algae and other organisms.
[0035] 2. The flotation effluent enters the fluorine and silicon removal module 2, and the fluorine and silicon content of the incoming water is reduced by adding chemicals, so that it forms a precipitate and separates. The precipitated sludge is treated by the sludge concentration and then the dematerialized sludge treatment system to reduce the impact of silicon and fluorine on the subsequent membrane system.
[0036] 3. The outlet water of the fluorine removal and silicon removal module enters 3 multi-media modules to remove the remaining SS in the wastewater.
[0037] 4. The effluent from the multi-media module enters the ultrafiltration module 4 to further remove the remaining SS and colloids in the wastewater, ensuring the long-term stable operation of the subsequent membrane system. The turbidity of the effluent from the ultrafiltration system is <3NTU.
[0038] 5. The outlet water of the ultrafiltration module enters the decarbonation module 5, where the pH is first adjusted to be slightly acidic by adding acid, and then the free carbon dioxide is blown away by the wind power of the fan.
[0039] 6. The effluent from the decarbonization module enters the nanofiltration module 6. The salts of monovalent anions (such as chloride ions) can pass through the membrane, but the retention rate of salts of multivalent anions (such as sulfate) is very high, that is, the separation of chloride ions and sulfate ions is achieved through the nanofiltration membrane.
[0040] 7. The concentrated water from the nanofiltration module enters the DTRO module 8. The DTRO has a high concentration multiple. For different wastewater qualities, the TDS of the concentrated water can reach 100,000 to 200,000 mg / L. After the wastewater is deeply concentrated by the DTRO membrane, the TDS of the concentrated water is further increased, and the amount of concentrated water is greatly reduced, thereby reducing the processing scale of the subsequent evaporation and crystallization module and saving investment costs and operating costs to the greatest extent.
[0041] 8. DTRO concentrated water enters the sodium chloride evaporation crystallization module 8, and the inlet water is preheated by a two-stage plate heat exchanger before entering the sodium chloride evaporation crystallizer. The crystal slurry after crystallization is pumped to the thickener for concentration, and after the solid-liquid ratio reaches 30-50%, it enters the double-stage piston pusher centrifuge for solid-liquid separation. The solid wet salt after centrifugation is transported by a screw conveyor to the sodium chloride centrifugal drying module 14 for drying, and the dried dry salt is transferred to the semi-automatic ton bag packaging machine for packaging.
[0042] 9. The sodium chloride evaporation and crystallization module discharges part of the mother liquor to the mixed salt module 9 to ensure the quality of the sodium chloride. The mixed salt sodium chloride evaporation mother liquor enters the mixed salt evaporation unit to further evaporate and crystallize the mixed concentrated liquid, and most of the sodium chloride and sodium sulfate are crystallized. After centrifugal separation, they are redissolved back into the evaporation and crystallization system. Then part of the sodium chloride is recovered through the sodium chloride evaporation system, thereby improving the resource utilization rate of the crystallized salt. The evaporated mother liquor of the mixed salt module enters the mixed salt module 13 for drying, and the small amount of mixed salt produced is finally outsourced for disposal.
[0043] 10. The concentrated water from the nanofiltration module enters the denitrification module 11, and calcium salt is added to generate gypsum products that can be recycled. Compared with evaporation and crystallization, the denitrification module 11 has more advantages in terms of electricity and steam consumption and investment and construction costs, reducing the evaporation and crystallization of sodium sulfate, which is more in line with the low-carbon and environmental protection initiative.
[0044] 11. The outlet water of the denitrification module 11 enters the hardness removal module 12, and the excess calcium ions are removed by adding a hardness removal agent, and the denitrified outlet water returns to the multi-media module.
[0045] 12. The water produced by the DTRO module, the sodium chloride evaporation crystallization module and the salt mixing module flows into the water production RO module 10 for recycling, thereby achieving the purpose of saving fresh water.
[0046] Compared with the traditional evaporation pond wastewater treatment which mostly adopts the pollution-resistant DTRO or falling film concentration form, which only achieves partial reduction but fails to completely treat the evaporation pond wastewater, the utility model realizes the full quantitative treatment of evaporation pond wastewater through pretreatment + nanofiltration device + evaporation crystallization device.
[0047] Compared with the traditional evaporation mixed salt process, the utility model obtains qualified gypsum and sodium chloride crystal salt, which truly realizes the resource utilization of evaporation pond wastewater.
[0048] Compared with the traditional process which is restricted by pollutants and needs to discharge the mother liquor to remove the impurity salt system when evaporation reaches a certain limit, the sodium chloride and sodium sulfate entrained in the mother liquor are also brought into the impurity salt. The mixed salt module of this setting first precipitates the mixed salt through co-saturation and then dissolves it back to the front stage, thereby improving the overall resource utilization rate.
[0049] Compared with the traditional nanofiltration salt separation process, which usually produces nanofiltration concentrate by evaporation and crystallization of sodium sulfate, the denitrification module used in this device has more advantages than evaporation and crystallization in terms of electricity and steam consumption as well as investment and construction costs. Therefore, compared with the traditional nanofiltration salt separation to separate sodium chloride and sodium sulfate, this process reduces the evaporation and crystallization of sodium sulfate and is more in line with the low-carbon and environmental protection initiative.
[0050] The above is only a preferred implementation of a new evaporation pond wastewater treatment system disclosed in the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the utility model, which all belong to the protection scope of the utility model.
Claims
1. A novel evaporation pond wastewater treatment system, characterized in that: It includes an air flotation module, a fluorine removal and silicon removal module, a multi-media module, an ultrafiltration module, a decarbonization module, a nanofiltration module, a DTRO module, a sodium chloride evaporation and crystallization module and a salt mixing module which are connected in sequence; The air flotation module is connected to an external evaporation pond, and PFS and PAM agents are added into the air flotation module to remove residual flocs; the salt mixing module is connected to the fluorine removal and silicon removal module.
2. A novel evaporation pond wastewater treatment system according to claim 1, characterized in that: The nanofiltration module is also connected to a denitrification module; the denitrification module generates gypsum products that can be recycled by adding calcium salt.
3. A novel evaporation pond wastewater treatment system according to claim 2, characterized in that: The multi-media module is also connected to a hardness removal module, which removes excess calcium ions by adding a hardness removal agent and simultaneously returns the hardness removal effluent to the multi-media module.
4. A novel evaporation pond wastewater treatment system according to claim 1, characterized in that: The mixed salt module is also connected to a mixed salt module, and the mixed salt module separates and processes the mixed salt.
5. A novel evaporation pond wastewater treatment system according to claim 1, characterized in that: It also includes a water production RO module, which is connected to the DTRO module, the sodium chloride evaporation crystallization module and the salt mixing module respectively; the water production RO module can recycle the water produced by the DTRO module, the sodium chloride evaporation crystallization module and the salt mixing module, and retransmit it to the DTRO module.
6. A novel evaporation pond wastewater treatment system according to claim 1, characterized in that: The sodium chloride evaporation and crystallization module is also connected to a centrifugal drying module to recover the sodium chloride.