Reclaimed water grading treatment system and non-ferrous smelting multi-quality water supply system

Abstract

This utility model discloses a graded treatment system for reclaimed water and a differentiated water supply system for non-ferrous smelting. The graded treatment system includes a regulating device, a primary treatment device, and a secondary treatment device. The regulating device receives reclaimed water. The primary treatment device includes a physicochemical reaction unit and a first filtration unit. The physicochemical reaction unit removes heavy metals from the reclaimed water and adjusts its hardness. The first filtration unit filters impurities from the reclaimed water to obtain a clarified liquid. A portion of the clarified liquid produced by the first filtration unit is used to provide the first product water. The secondary treatment device is connected to the first filtration unit and purifies the remaining clarified liquid flowing out of the first filtration unit. The purified water discharged from the secondary treatment device provides the second product water, and the concentrated water discharged from the secondary treatment device provides the third product water. This utility model can grade reclaimed water to obtain product water of different qualities, optimizes the process flow, and improves economic and environmental benefits.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment systems, specifically relating to a graded treatment system for reclaimed water and a differentiated water supply system for non-ferrous smelting. Background Technology

[0002] The global water shortage crisis is reshaping the production paradigm of human society at an unexpected pace. Industrial water use already accounts for 22% of global freshwater consumption, with the non-ferrous metallurgical industry being a typical high water-consuming sector due to its technological characteristics. Against the backdrop of accelerated urbanization, the strategic value of urban reclaimed water as a "second water source" is increasingly prominent. Deeply treated reclaimed water not only meets national discharge standards but also has the potential to replace conventional water resources. Utility Model Content

[0003] This utility model is based on the inventor's discovery and understanding of the following facts and problems:

[0004] The inventors recognized that the differences in water quality requirements at various stages of the non-ferrous smelting industry provide a natural interface for the graded utilization of reclaimed water, making urban reclaimed water, an economical and sustainable water resource, demonstrate great potential in alleviating water shortages in the non-ferrous smelting industry.

[0005] The inventors also recognized that the water treatment system in the related technology has the following disadvantages: (1) the reclaimed water adopts a unified whole treatment system, the effluent water quality is uniform, and the water quality requirements of each water system of the enterprise are not considered; (2) the removal efficiency of pollutants such as heavy metals and hardness is low; (3) the process is complicated, and the investment and operating costs are high.

[0006] This utility model aims to at least partially solve one of the technical problems in the related art.

[0007] Therefore, embodiments of this utility model propose a reclaimed water graded treatment system with high water treatment efficiency, capable of graded treatment and graded water supply.

[0008] An embodiment of this utility model also proposes a non-ferrous smelting water supply system with different water grades.

[0009] The reclaimed water grading treatment system of this utility model embodiment includes:

[0010] A regulating device is used to receive reclaimed water so that the reclaimed water is temporarily stored in the regulating device for homogenizing water quality and regulating water quantity.

[0011] A primary treatment device is connected to the regulating device. The primary treatment device includes a physicochemical reaction unit and a first filtration unit connected to each other. The reclaimed water flowing out of the regulating device flows into the first filtration unit after passing through the physicochemical reaction unit. The physicochemical reaction unit is used to remove heavy metals from the reclaimed water and regulate the hardness of the water. The first filtration unit is used to filter out impurities in the reclaimed water to obtain a clear liquid. Part of the clear liquid produced by the first filtration unit is used to provide the first product water.

[0012] A secondary treatment device is connected to the first filtration unit. The secondary treatment device is used to purify the remaining clear liquid flowing out of the first filtration unit. The secondary treatment device has a clean water outlet and a concentrated water outlet. The clean water outlet is used to discharge the purified water to provide a second product water, and the concentrated water outlet is used to discharge the concentrated water to provide a third product water.

[0013] The reclaimed water grading treatment system of this utility model can grade reclaimed water according to the water quality requirements of different production stages in the non-ferrous smelting industry, thereby obtaining product water of different qualities. This optimizes the process flow, avoids full treatment of all reclaimed water, reduces treatment costs, and improves economic and environmental benefits.

[0014] In some embodiments, the regulating device includes a regulating tank, wherein the reclaimed water in the regulating tank is stored for a period of 8 hours or more.

[0015] In some embodiments, the physicochemical reaction unit includes a heavy metal removal reaction tank and a hardness removal reaction tank connected together. The reclaimed water discharged by the regulating device flows sequentially through the heavy metal removal reaction tank and the hardness removal reaction tank to remove heavy metals and hardness from the reclaimed water, respectively.

[0016] In some embodiments, the heavy metal removal reaction tank has a heavy metal catching agent inlet and a heavy metal removal treatment liquid outlet, and the hardening removal reaction tank has a softening agent inlet, a hardening treatment liquid inlet and a hardening treatment liquid outlet, wherein the hardening treatment liquid inlet is connected to the heavy metal removal treatment liquid outlet.

[0017] In some embodiments, the first filtering unit includes:

[0018] A mechanical clarifier, having a supernatant overflow outlet and a bottom outlet, is connected to the physicochemical reaction unit;

[0019] A multi-media filter, the multi-media filter having a filtrate inlet and a supernatant outlet, the filtrate inlet being connected to the supernatant overflow outlet through a first pipe;

[0020] A sludge thickening tank, the sludge thickening tank having a sludge inlet, a liquid outlet and a sludge outlet, the sludge inlet being connected to the underflow outlet and the liquid outlet being connected to the regulating device;

[0021] A filter press device has a filtrate inlet and a filtrate outlet, the filtrate inlet being connected to the sludge outlet and the filtrate outlet being connected to the regulating device.

[0022] In some embodiments, the mechanical clarifier further includes a flocculant inlet and a coagulant inlet, and the first pipe is provided with an oxidant inlet and a bactericide inlet.

[0023] In some embodiments, the secondary treatment device includes an ultrafiltration unit and a reverse osmosis unit. The ultrafiltration unit is connected to the multi-media filter for filtering suspended solids and particulate matter in the residual clarified liquid discharged from the multi-media filter. The reverse osmosis unit is connected to the ultrafiltration unit and is used to treat the ultrafiltrate filtered by the ultrafiltration unit to obtain purified water and concentrated water, respectively.

[0024] In some embodiments, the ultrafiltration unit includes an ultrafiltration inlet and an ultrafiltration outlet. The ultrafiltration inlet is connected to the multi-media filter via a second pipe, which is provided with an acidic pH adjuster inlet.

[0025] In some embodiments, the reverse osmosis unit includes:

[0026] A primary reverse osmosis unit, comprising a first reverse osmosis inlet, a first reverse osmosis concentrate outlet, and a first reverse osmosis permeate outlet; the first reverse osmosis inlet is connected to the ultrafiltration outlet.

[0027] A secondary concentrate reverse osmosis device includes a second reverse osmosis inlet and a second reverse osmosis permeate outlet. The second reverse osmosis inlet is connected to the first reverse osmosis concentrate outlet. The first reverse osmosis permeate outlet and the second reverse osmosis permeate outlet together constitute the purified water outlet. The concentrate outlet is provided on the secondary concentrate reverse osmosis device to discharge concentrate.

[0028] The product water tank is connected to the purified water outlet.

[0029] A concentrate tank is connected to the concentrate outlet.

[0030] The non-ferrous smelting water supply system of this utility model embodiment includes:

[0031] A reclaimed water grading treatment system, wherein the reclaimed water grading treatment system is the reclaimed water grading treatment system described in any of the above embodiments;

[0032] The plant area circulating water system is connected to the first filtration unit in the reclaimed water graded treatment system so that a portion of the clear liquid obtained from the primary treatment device is used for the plant area circulating water.

[0033] A production water system for the plant area, wherein the production water system for the plant area is connected to the purified water outlet of the reclaimed water graded treatment system so that the purified water obtained by the secondary treatment device is supplied to the plant area for production water;

[0034] A slag slow cooling water system is provided, which is connected to the concentrated water outlet so that the concentrated water obtained from the secondary treatment unit is used for slag slow cooling. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the reclaimed water grading treatment system according to an embodiment of the present invention.

[0036] Figure 2 The turbidity monitoring data of the reclaimed water grading treatment system in this embodiment of the utility model were selected from 31 days of continuous operation.

[0037] Figure 3 The hardness monitoring data of the reclaimed water grading treatment system in this embodiment of the utility model were selected from 31 days of continuous operation.

[0038] Figure 4 The chloride concentration monitoring data of the reclaimed water grading treatment system in this embodiment of the utility model were selected from 31 days of continuous operation.

[0039] Figure 5 The SS and TDS concentration monitoring data of the reclaimed water graded treatment system in this embodiment of the utility model were selected from 31 days of continuous operation.

[0040] Figure label:

[0041] 10. Adjustment device;

[0042] 20. Primary processing unit;

[0043] 210. Physicochemical reaction unit; 211. Gravity removal reaction tank; 212. Hardness removal reaction tank; 220. First filtration unit; 221. Mechanical clarifier; 222. Multi-media filter; 223. Sludge thickening tank; 224. Filter press;

[0044] 30. Secondary processing unit;

[0045] 310. Ultrafiltration unit; 320. Reverse osmosis unit; 321. First-stage reverse osmosis unit; 322. Second-stage concentrate reverse osmosis unit; 323. Product water tank; 324. Concentrate tank;

[0046] 40. Plant area circulating water system;

[0047] 50. Plant production water system;

[0048] 60. Slag slow cooling water system. Detailed Implementation

[0049] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0050] See Figure 1 The reclaimed water graded treatment system of this utility model includes an adjustment device 10, a primary treatment device 20 and a secondary treatment device 30.

[0051] This embodiment of the invention takes into account the differences in water quality requirements at various production stages in the non-ferrous smelting industry, providing a natural interface for tiered water supply based on water quality. Simultaneously, by addressing the varying water quality requirements of different production stages, urban reclaimed water can be treated in stages. By supplying different quality products to various production stages within the non-ferrous smelting industry, this economical and sustainable water resource demonstrates significant potential value in alleviating water shortages in the non-ferrous smelting industry.

[0052] The regulating device 10 is used to receive urban reclaimed water. Since the sources of urban reclaimed water are relatively complex, and the water quality varies at different times of the day, this embodiment of the invention uses the regulating device 10 to receive urban reclaimed water from different sources within a certain time period and store it within the regulating device 10 for a certain period to achieve water quality homogenization. This facilitates the addition of different agents in subsequent treatment processes and ensures treatment effectiveness. Simultaneously, this embodiment of the invention can also provide a reliable and sufficient water source for subsequent treatment operations, ensuring stable system operation load and stable and controllable water production for different water qualities, providing a stable water supply for the non-ferrous smelting industry.

[0053] The regulating device 10 can be a regulating tank, and there can be multiple regulating tanks to receive municipal reclaimed water one by one. The storage time of the reclaimed water in the regulating tank is greater than or equal to 8 hours. For example, the storage time of the reclaimed water in each regulating tank is 8 hours, 8.5 hours, 9 hours or 10 hours. Of course, the storage time of the reclaimed water in the regulating tank can be further extended according to actual needs.

[0054] Multiple regulating devices 10 can share a set of primary treatment device 20 and secondary treatment device 30; or, each regulating device 10 can be equipped with a primary treatment device 20 and a secondary treatment device 30; or, multiple regulating devices 10 can be connected to multiple primary treatment devices 20 and multiple secondary treatment devices 30, and the number of primary treatment devices 20 and secondary treatment devices 30 in operation can be adjusted according to the water load of the non-ferrous smelting industry and the water volume of urban reclaimed water, so as to achieve dynamic adjustment and ensure that the treatment devices operate stably under normal rated operating load.

[0055] The primary treatment device 20 is connected to the regulating device 10. The primary treatment device 20 includes a physicochemical reaction unit 210 and a first filtration unit 220 connected to each other. The reclaimed water flowing out of the regulating device 10 flows into the first filtration unit 220 after passing through the physicochemical reaction unit 210. The physicochemical reaction unit 210 is used to remove heavy metals from the reclaimed water and regulate the hardness of the water. The first filtration unit 220 is used to filter out impurities in the reclaimed water to obtain a clear liquid. Part of the clear liquid produced by the first filtration unit 220 is used to provide the first product water.

[0056] This embodiment can be designed according to the water quality requirements of different production stages in the non-ferrous smelting industry. The physicochemical reaction unit 210 and the first filtration unit 220 in the primary treatment device 20 are designed so that the first product water obtained by the primary treatment device 20 can meet the water requirements of some production stages in the non-ferrous smelting industry. This can reduce the amount of reclaimed water treated by the secondary treatment device 30, reduce treatment costs, and improve economic efficiency.

[0057] The physicochemical reaction unit 210 removes heavy metals such as copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium, and bismuth from water, preventing these heavy metals from entering subsequent permeable water, sludge, filter residue, or other waste. Simultaneously, it removes calcium and magnesium ions from reclaimed water, adjusting water hardness and preventing scaling problems when the permeable water is used in the non-ferrous smelting industry.

[0058] The first filtration unit 220 filters out solid suspended matter, flocculent matter, and other impurities from the water, thereby obtaining first-grade product water that meets the water quality requirements for certain production stages in the non-ferrous smelting industry. A portion of the clarified liquid produced by the first filtration unit is transported as first-grade product water to a portion of the water supply system in the non-ferrous smelting industry. The remaining clarified liquid produced by the first filtration unit is transported to the secondary treatment unit 30 for further processing.

[0059] The secondary treatment device 30 is connected to the first filtration unit 220. The secondary treatment device 30 is used to purify the remaining clear liquid flowing out of the first filtration unit 220. The secondary treatment device 30 has a clean water outlet and a concentrated water outlet. The clean water outlet is used to discharge the purified water to provide the second product water, and the concentrated water outlet is used to discharge the concentrated water to provide the third product water.

[0060] This embodiment can be designed to meet the water quality requirements of another production stage in the non-ferrous smelting industry by designing the secondary treatment device 30, so that the second and third produced water meet the water requirements of different production stages in the non-ferrous smelting industry.

[0061] The non-ferrous smelting industry typically includes plant circulating water, plant production water, and slag cooling water. Among these, plant production water has the highest water quality requirements, followed by plant circulating water, and slag cooling water has the lowest requirements. Therefore, in this embodiment, the first product water can be used for plant circulating water, and the primary treatment unit 20 is designed according to the water quality requirements of the plant circulating water. Simultaneously, in this embodiment, the second product water can be used for plant production water, and the third product water can be used for slag cooling water. The secondary treatment unit 30 is designed according to the water quality requirements of the plant production water and slag cooling water.

[0062] The reclaimed water grading treatment system of this utility model can grade reclaimed water according to the water quality requirements of different production stages in the non-ferrous smelting industry, thereby obtaining product water of different qualities. This optimizes the process flow, avoids full treatment of all reclaimed water, reduces treatment costs, and improves economic and environmental benefits.

[0063] In some embodiments, the physicochemical reaction unit 210 includes a heavy metal removal reaction tank 211 and a hardness removal reaction tank 212 connected to each other. After being homogenized in a regulating tank, urban reclaimed water flows sequentially through the heavy metal removal reaction tank 211 and the hardness removal reaction tank 212 to remove heavy metals and hardness from the reclaimed water, respectively. The heavy metal removal reaction tank 211 removes heavy metal pollutants from the water using physicochemical methods, reducing the heavy metal concentration in the reclaimed water and achieving the goals of environmental pollution control and resource recycling. The hardness removal reaction tank 212 can remove hardness from the reclaimed water using methods such as fluidized bed crystallization, precipitation, ion exchange, electrochemical methods, and dual-membrane methods.

[0064] Furthermore, the heavy metal removal reaction tank 211 has a heavy metal scavenging agent inlet and a heavy metal removal treatment liquid outlet. Heavy metal scavenging agent is added into the heavy metal removal reaction tank 211 through the heavy metal scavenging agent inlet. After the heavy metal scavenging agent and regenerated water fully contact and react in the heavy metal removal reaction tank 211, the liquid after removing heavy metal pollutants flows into the hardness removal reaction tank 212 through the heavy metal removal treatment liquid outlet.

[0065] The hardness removal reaction tank 212 has a softening agent inlet, a hardness removal treatment liquid inlet, and a hardness removal treatment liquid outlet. The hardness removal treatment liquid inlet is connected to the heavy weight removal treatment liquid outlet. The softening agent inlet is used to add chemical agents into the hardness removal reaction tank 212. For example, when using the sedimentation method, an appropriate amount of chemical agent is added to the hardness removal reaction tank 212 through the softening agent inlet, causing calcium and magnesium ions to react chemically with the agent to form insoluble precipitates. The precipitates are then separated, and reclaimed water after heavy weight removal and hardness removal is obtained.

[0066] In some embodiments, the first filtration unit 220 includes a mechanical clarifier 221, a multi-media filter 222, a sludge thickener 223, and a filter press 224.

[0067] The mechanical clarifier 221 has a supernatant overflow outlet and a bottom flow outlet, and is connected to the physicochemical reaction unit 210. The mechanical clarifier 221 uses mechanical power to agitate the reclaimed water, causing solid impurities in the water to come into contact with and flocculate with the formed sludge, thus separating and settling them. The mechanical clarifier 221 also has a flocculant inlet and a coagulant inlet.

[0068] Agitator blades can be installed inside the mechanical clarifier 221. After flocculant and coagulant are added into the mechanical clarifier 221 through the flocculant inlet and coagulant inlet, the reclaimed water, flocculant, coagulant and sludge are quickly mixed by agitation. The sludge collides and adsorbs together and can form larger flocs. After clarification, the supernatant can be separated, while the sludge at the bottom can be scraped into the sludge hopper by a sludge scraper and discharged through the sludge discharge valve at the underflow outlet, thus achieving the purpose of clarifying and separating the reclaimed water.

[0069] The multi-media filter 222 has a filtrate inlet and a supernatant outlet. The filtrate inlet is connected to the supernatant overflow outlet through a first pipe, which is equipped with an oxidant inlet and a bactericide inlet. The supernatant discharged from the supernatant outlet can be transported to a water pool or tank for storage. A portion of the supernatant is used as the primary product water to replenish the plant's circulating water, while the remaining supernatant enters the secondary treatment unit for further purification.

[0070] Oxidizing agent and bactericide are supplied to the first pipe through the oxidizing agent inlet and the bactericide inlet. The flow rate of the oxidizing agent and bactericide is matched with the flow rate of the supernatant in the first pipe. The supernatant flowing out of the supernatant overflow outlet can be mixed with the oxidizing agent and bactericide when it flows through the first pipe, and then flows into the multi-media filter 222 through the filtrate inlet.

[0071] The multi-media filter 222 can be configured with a filter layer, which is formed by stacking filter media such as quartz sand, anthracite, and manganese sand to a certain thickness. Under a certain pressure, the supernatant can remove suspended impurities when passing through the filter layer, making the water clearer. This produces the first product water, which meets the water requirements of some production stages in the non-ferrous smelting industry.

[0072] The sludge thickening tank 223 has a sludge inlet, a liquid outlet, and a sludge outlet. The sludge inlet is connected to the underflow outlet, and the sludge discharged from the mechanical clarifier 221 can flow into the sludge thickening tank 223 through the sludge inlet. The sludge thickening tank 223 can be an intermittent thickening tank or a continuous thickening tank. The thickening method can be gravity thickening, air flotation thickening, or centrifugal thickening. The liquid discharged after thickening can be sent to the regulating device 10 through the liquid outlet. The thickened sludge is then sent to the filter press 224.

[0073] In this embodiment, the filter press device 224 is a filter press with a filtrate inlet and a filtrate outlet. The concentrated sludge discharged from the sludge thickening tank 223 is transported into the filter press device 224 through the filtrate inlet. The filtrate after solid-liquid separation is transported into the regulating device 10 through the filtrate outlet. The filter cake after solid-liquid separation is transported off-site for processing.

[0074] In some embodiments, the secondary treatment device 30 includes an ultrafiltration unit 310 and a reverse osmosis unit 320. The ultrafiltration unit 310 is connected to a multi-media filter 222 to filter suspended solids and particulate matter in the remaining clarified liquid discharged from the multi-media filter 222. The ultrafiltration unit 310 includes an ultrafiltration inlet and an ultrafiltration outlet. The ultrafiltration inlet is connected to the multi-media filter 222 via a second pipe, which is provided with an acidic pH adjuster inlet for adjusting the pH of the liquid entering the ultrafiltration unit 310. The ultrafiltration unit 310 uses pressurized membrane separation technology to separate macromolecular substances. The pore size of the ultrafiltration membrane in the ultrafiltration unit 310 of this embodiment can be selected according to actual needs. The filtrate discharged from the multi-media filter flows from the high-pressure side to the low-pressure side of the ultrafiltration membrane, and suspended solids or particulate matter are retained, thereby obtaining ultrafiltrate.

[0075] The reverse osmosis unit 320 is connected to the ultrafiltration unit 310. The reverse osmosis unit 320 uses membrane separation technology to effectively remove some organic matter, colloidal particles, bacteria, etc. from the water, thereby purifying the water. The reverse osmosis unit 320 is used to treat the ultrafiltrate filtered by the ultrafiltration unit 310 to obtain purified water and concentrated water, respectively.

[0076] In this embodiment, the reverse osmosis unit 320 includes a primary reverse osmosis device 321, a secondary concentrate reverse osmosis device 322, a product water tank 323, and a concentrate tank 324. The primary reverse osmosis device 321 has a first reverse osmosis inlet, a first reverse osmosis concentrate outlet, and a first reverse osmosis product water outlet. The first reverse osmosis inlet is connected to the ultrafiltration outlet so that the ultrafiltrate enters the primary reverse osmosis device 321 for the first reverse osmosis filtration.

[0077] The secondary concentrate reverse osmosis unit 322 includes a second reverse osmosis inlet and a second reverse osmosis permeate outlet. The second reverse osmosis inlet is connected to the first reverse osmosis concentrate outlet to achieve a second reverse osmosis filtration, thereby maximizing water resource recovery. The first and second reverse osmosis permeate outlets together form a purified water outlet, whose permeate can be used for production water within the plant. The concentrate outlet is located on the secondary concentrate reverse osmosis unit 322 to discharge concentrated water, which can be used for sludge slow cooling.

[0078] This utility model embodiment, based on the water quality requirements of production water in the factory area, adopts a combined process of "mechanical clarifier 221 + multi-media filter 222 + ultrafiltration + dual-stage reverse osmosis" to deeply treat urban reclaimed water, thereby effectively replacing the water source for the non-ferrous smelting industry, improving the utilization rate of urban reclaimed water, and achieving significant economic and environmental benefits, making it easy to apply on a large scale.

[0079] Of course, in order to ensure a stable supply of water for production and slag cooling in the plant area, the product water tank 323 can be connected to the clean water outlet and the concentrated water tank 324 can be connected to the concentrated water outlet. Thus, the water flowing out of the clean water outlet is stored in the product water tank 323 and the water flowing out of the concentrated water outlet is stored in the concentrated water tank 324.

[0080] The non-ferrous smelting graded water supply system of this utility model includes a reclaimed water graded treatment system, a plant circulating water system 40, a plant production water system 50, and a slag slow cooling water system 60.

[0081] The reclaimed water grading treatment system is any of the reclaimed water grading treatment systems described above. The plant circulating water system 40 is connected to the multi-media filter in the reclaimed water grading treatment system so that a portion of the clarified liquid produced by the multi-media filter is supplied to the plant circulating water system; the plant production water system 50 is connected to the purified water outlet of the reclaimed water grading treatment system so that the purified water obtained from the secondary treatment unit 30 is supplied to the plant production water system; and the slag slow cooling water system 60 is connected to the concentrated water outlet so that the concentrated water obtained from the secondary treatment unit 30 is supplied to the slag slow cooling water system.

[0082] This utility model embodiment can classify and treat urban reclaimed water, and apply it to different production stages in the non-ferrous smelting industry according to different water quality. It can achieve zero discharge, has a simple overall process, low investment and operating costs, effectively saves water resources, improves the utilization rate of urban reclaimed water, and has significant economic and environmental benefits.

[0083] Zinc, an important non-ferrous metal, is a key raw material for industries such as construction and infrastructure. my country is one of the world's most important zinc smelting producers and consumers, with a zinc output of 6.837 million tons, accounting for about half of the world's total production. The zinc smelting industry consumes a significant amount of water, with a production water quota of approximately 7-12 cubic meters per ton. Due to water scarcity, urban reclaimed water will be a crucial water resource for the zinc smelting industry.

[0084] The following example uses the reclaimed water grading treatment system in this utility model to treat urban reclaimed water in a water-scarce area as production water for a zinc smelting enterprise, and provides a data comparison and explanation.

[0085] Table 1 Comparison of Allowable Discharge Concentration of Wastewater Treatment Plant Effluent and Measured Values ​​of Raw Water for Urban Reclaimed Water

[0086]

[0087] Table 2 Water usage in different stages of zinc smelting enterprises

[0088]

[0089] The analysis was performed using monitoring data from 31 consecutive days of operation; the results are shown in [link to results]. Figures 2-5 As shown in the data, the quality of urban reclaimed water is relatively stable. After primary treatment, the turbidity is reduced by about 70%, and the suspended solids (SS) concentration is significantly reduced to about 1 mg / L, meeting the requirements for replenishing circulating water in the plant area. After secondary treatment, the concentrations of various pollutants in the water remain at low levels, with the total dissolved solids (TDS) concentration only 23% of the required value, fully meeting the plant's production water requirements.

[0090] The first product water obtained from the primary treatment unit can be used for the plant's circulating water system, and the second product water obtained from the secondary treatment unit can be used for boiler feed water and zinc smelting water.

[0091] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0094] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0095] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0096] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A graded treatment system for reclaimed water, characterized in that, include: A regulating device is used to receive reclaimed water so that the reclaimed water is temporarily stored in the regulating device for homogenizing water quality and regulating water quantity. A primary treatment device is connected to the regulating device. The primary treatment device includes a physicochemical reaction unit and a first filtration unit connected to each other. The reclaimed water flowing out of the regulating device flows into the first filtration unit after passing through the physicochemical reaction unit. The physicochemical reaction unit is used to remove heavy metals from the reclaimed water and regulate the hardness of the water. The first filtration unit is used to filter out impurities in the reclaimed water to obtain a clear liquid. Part of the clear liquid produced by the first filtration unit is used to provide the first product water. A secondary treatment device is connected to the first filtration unit. The secondary treatment device is used to purify the remaining clear liquid flowing out of the first filtration unit. The secondary treatment device has a clean water outlet and a concentrated water outlet. The clean water outlet is used to discharge the purified water to provide a second product water, and the concentrated water outlet is used to discharge the concentrated water to provide a third product water.

2. The reclaimed water grading treatment system according to claim 1, characterized in that, The regulating device includes a regulating tank, and the reclaimed water in the regulating tank is stored for a period of 8 hours or more.

3. The reclaimed water grading treatment system according to claim 1, characterized in that, The physicochemical reaction unit includes a heavy metal removal reaction tank and a hardness removal reaction tank connected to each other. The reclaimed water discharged from the regulating device flows sequentially through the heavy metal removal reaction tank and the hardness removal reaction tank to remove heavy metals and hardness from the reclaimed water, respectively.

4. The reclaimed water grading treatment system according to claim 3, characterized in that, The heavy metal removal reaction tank has a heavy metal catching agent inlet and a heavy metal removal treatment liquid outlet, and the hardening removal reaction tank has a softening agent inlet, a hardening treatment liquid inlet and a hardening treatment liquid outlet, with the hardening treatment liquid inlet connected to the heavy metal removal treatment liquid outlet.

5. The reclaimed water grading treatment system according to claim 1, characterized in that, The first filtering unit includes: A mechanical clarifier, having a supernatant overflow outlet and a bottom outlet, is connected to the physicochemical reaction unit; A multi-media filter, the multi-media filter having a filtrate inlet and a supernatant outlet, the filtrate inlet being connected to the supernatant overflow outlet through a first pipe; A sludge thickening tank, the sludge thickening tank having a sludge inlet, a liquid outlet and a sludge outlet, the sludge inlet being connected to the underflow outlet and the liquid outlet being connected to the regulating device; A filter press device has a filtrate inlet and a filtrate outlet, the filtrate inlet being connected to the sludge outlet and the filtrate outlet being connected to the regulating device.

6. The reclaimed water grading treatment system according to claim 5, characterized in that, The mechanical clarifier also has a flocculant inlet and a coagulant inlet, and the first pipe is provided with an oxidant inlet and a bactericide inlet.

7. The reclaimed water grading treatment system according to claim 6, characterized in that, The secondary treatment device includes an ultrafiltration unit and a reverse osmosis unit. The ultrafiltration unit is connected to the multi-media filter and is used to filter suspended solids and particulate matter in the residual clarified liquid discharged from the multi-media filter. The reverse osmosis unit is connected to the ultrafiltration unit and is used to treat the ultrafiltrate filtered by the ultrafiltration unit to obtain purified water and concentrated water, respectively.

8. The reclaimed water grading treatment system according to claim 7, characterized in that, The ultrafiltration unit includes an ultrafiltration inlet and an ultrafiltration outlet. The ultrafiltration inlet is connected to the multi-media filter via a second pipe, which is provided with an acidic pH adjuster inlet.

9. The reclaimed water grading treatment system according to claim 8, characterized in that, The reverse osmosis unit includes: A primary reverse osmosis unit, comprising a first reverse osmosis inlet, a first reverse osmosis concentrate outlet, and a first reverse osmosis permeate outlet; the first reverse osmosis inlet is connected to the ultrafiltration outlet. A secondary concentrate reverse osmosis device includes a second reverse osmosis inlet and a second reverse osmosis permeate outlet. The second reverse osmosis inlet is connected to the first reverse osmosis concentrate outlet. The first reverse osmosis permeate outlet and the second reverse osmosis permeate outlet together constitute the purified water outlet. The concentrate outlet is provided on the secondary concentrate reverse osmosis device to discharge concentrate. The product water tank is connected to the purified water outlet. A concentrate tank is connected to the concentrate outlet.

10. A non-ferrous smelting water supply system with differentiated water supply, characterized in that, include: A reclaimed water grading treatment system, wherein the reclaimed water grading treatment system is the reclaimed water grading treatment system according to any one of claims 1 to 9; The plant area circulating water system is connected to the primary treatment unit of the reclaimed water graded treatment system so that a portion of the clarified liquid obtained by the primary treatment unit is used for the plant area circulating water system. A production water system for the plant area, wherein the production water system for the plant area is connected to the purified water outlet of the reclaimed water graded treatment system so that the purified water obtained by the secondary treatment device is supplied to the plant area for production water; A slag slow cooling water system is provided, which is connected to the concentrated water outlet so that the concentrated water obtained from the secondary treatment unit is used for slag slow cooling.

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