Stainless steel wastewater treatment system

Abstract

The utility model provides a stainless steel wastewater treatment system which comprises a pretreatment unit which comprises a high-density sedimentation tank device and a first filtering device which are sequentially connected in series through a pipeline; the deep treatment unit is communicated with the pretreatment unit through a pipeline, and the deep treatment unit comprises an ultrafiltration device and a first reverse osmosis device which are sequentially connected in series through a pipeline; the sludge treatment unit is communicated with the high-density sedimentation tank device through a pipeline; the dosing unit is respectively connected with the high-density sedimentation tank device, the ultrafiltration device, the first reverse osmosis device and the sludge treatment unit. According to the utility model, most impurities and pollutants in the wastewater can be effectively removed, the treated water quality can stably reach the standard, the treatment efficiency is high, the operation cost is low, and the requirements of environmental protection and reuse of reclaimed water can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, and particularly relates to a stainless steel wastewater treatment system. Background Art

[0002] During the production process of stainless steel, a large amount of wastewater is generated, and the wastewater contains various harmful substances, such as heavy metal ions, suspended solids, oils, and organic pollutants, etc. Traditional wastewater treatment methods mainly include physical sedimentation method, chemical treatment method, and biological treatment method, etc. The physical sedimentation method is one of the most basic methods in water treatment. It utilizes the sedimentation performance of suspended particles in water and generates a sinking effect under the action of gravity to achieve the purpose of solid-liquid separation. The chemical treatment method is a wastewater treatment method that separates and removes pollutants in the wastewater in a dissolved or colloidal state or converts them into harmless substances through chemical reactions and mass transfer. The biological treatment method is a wastewater treatment method that uses microorganisms in the natural environment to oxidize and decompose organic matter and certain inorganic poisons (such as cyanide and sulfide) in the wastewater and converts them into stable and harmless inorganic substances. However, these methods have problems such as low treatment efficiency, high waste of chemicals, high operating cost, and difficulty in meeting the water quality standards after treatment.

[0003] For example, the existing physical sedimentation method can only remove suspended solids in the wastewater and has limited effects on dissolved heavy metal ions and organic pollutants; although the chemical treatment method can remove some heavy metals and organic pollutants, it will cause secondary pollution; the biological treatment method requires a long reaction time and has high requirements for water quality.

[0004] Therefore, there is an urgent need for a water treatment system that is efficient, low-cost, and can completely treat stainless steel production wastewater to meet the requirements of environmental protection and the reuse of reclaimed water. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a stainless steel wastewater treatment system, which can effectively remove most of the impurities and pollutants in the wastewater, the water quality after treatment can stably meet the standards, the treatment efficiency is high, and the operating cost is low, and it can meet the requirements of environmental protection and the reuse of reclaimed water.

[0006] To achieve the above purpose, the utility model provides a stainless steel wastewater treatment system, which includes:

[0007] A pretreatment unit, the pretreatment unit includes a high-density sedimentation tank device and a first filtration device connected in series through pipelines in sequence;

[0008] A deep treatment unit, the deep treatment unit is connected to the pretreatment unit through a pipeline, and the deep treatment unit includes an ultrafiltration device and a first reverse osmosis device connected in series through pipelines in sequence;

[0009] A sludge treatment unit, which is connected to the high-density sedimentation tank device through a pipeline;

[0010] A chemical dosing unit, which is respectively connected to the high-density sedimentation tank device, the ultrafiltration device, the first reverse osmosis device and the sludge treatment unit.

[0011] Optionally, the stainless steel wastewater treatment system includes a control component, which is electrically connected to the high-density sedimentation tank device and the chemical dosing unit respectively, and is used to control the influent flow rate, effluent flow rate of the high-density sedimentation tank device and the chemical dosing amount of the chemical dosing unit.

[0012] Optionally, the high-density sedimentation tank device includes a high-density sedimentation tank and a sight glass assembly. The sight glass assembly is connected to the high-density sedimentation tank. The sight glass assembly is used to monitor the high-density sedimentation tank device and form an image. The control component adjusts the influent flow rate, effluent flow rate of the high-density sedimentation tank device and the chemical dosing amount of the chemical dosing unit according to the image observed by the sight glass assembly.

[0013] Optionally, the advanced treatment unit includes a concentrated brine treatment device. The concentrated brine treatment device includes a blast furnace component. The blast furnace component is connected to the first reverse osmosis device through a pipeline and is used to carry out slag flushing treatment on the concentrated brine discharged from the first reverse osmosis device.

[0014] Optionally, the concentrated brine treatment device includes a second reverse osmosis device. The first reverse osmosis device, the second reverse osmosis device and the blast furnace component are connected in series through pipelines in sequence.

[0015] Optionally, the sludge treatment unit includes a slurry pond and a dehydrator. The high-density sedimentation tank device, the slurry pond and the dehydrator are connected in series through pipelines in sequence.

[0016] Optionally, the pretreatment unit includes a fine grid assembly and a first regulating tank. The fine grid assembly, the first regulating tank and the high-density sedimentation tank device are connected in series through pipelines in sequence.

[0017] Optionally, the first filtration device is connected to the first regulating tank through a first backwash drain pipe, and the ultrafiltration device is connected to the first regulating tank through a second backwash drain pipe.

[0018] Optionally, the ultrafiltration device includes a second filtration device, an ultrafiltration component and a first product water tank. The pretreatment unit, the second filtration device, the ultrafiltration component, the first product water tank and the first reverse osmosis device are connected in series through pipelines in sequence. The chemical dosing unit is used to add chemicals to the ultrafiltration component.

[0019] Optionally, the pretreatment unit includes a recycled water tank. The first filtration device, the recycled water tank, and the ultrafiltration device are connected in series through pipelines in sequence. The recycled water tank is connected with a recycled water pipeline. A part of the water discharged from the recycled water tank enters the ultrafiltration device through a pipeline, and another part of the water discharged from the recycled water tank enters the recycled water pipeline for recycling; the advanced treatment unit includes a second product water tank, and the second product water tank is communicated with the first reverse osmosis device through a pipeline for receiving the desalted water discharged from the first reverse osmosis device.

[0020] With the above configuration, the setting of the high-density sedimentation tank can improve the sedimentation efficiency of suspended solids, significantly reduce the content of suspended solids in the effluent, and has a good effect on removing heavy metal ions in the wastewater, removing the hardness of the wastewater, and reducing turbidity; the ultrafiltration device further removes tiny suspended solids, colloids, macromolecular substances, etc. in the wastewater; a first reverse osmosis device is arranged at the rear end of the ultrafiltration device for desalination, so as to filter out most of the impurities and pollutants to obtain desalted water, and the desalted water can be supplemented into the production new water pipe network as production new water. To sum up, the stainless steel wastewater treatment system of the present invention can effectively remove most of the impurities and pollutants in the wastewater, the treated water quality can meet the standards stably, the treatment efficiency is high, and the operation cost is low, which can meet the environmental protection requirements and the demand for recycled water reuse. Description of the Drawings

[0021] Those of ordinary skill in the art should understand that the provided drawings are used to better understand the present invention and do not constitute any limitation to the scope of the present invention. Among them:

[0022] Figure 1 is a schematic diagram of the stainless steel wastewater treatment system according to an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the pretreatment unit according to an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the advanced treatment unit according to an embodiment of the present invention. Detailed Embodiments

[0025] In this article, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "top", "bottom", etc. are used to indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation and operation, so it cannot be understood as a limitation to the present invention.

[0026] The specific embodiments of the present utility model will be described in more detail below in conjunction with the schematic diagrams. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the attached drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0027] Figure 1 is a schematic diagram of a stainless steel wastewater treatment system according to an embodiment of the present utility model. Please refer to Figure 1 , the embodiment of the present utility model provides a stainless steel wastewater treatment system, which includes a pretreatment unit, a deep treatment unit, a sludge treatment unit, and a chemical dosing unit.

[0028] Figure 2 is a schematic diagram of the pretreatment unit according to an embodiment of the present utility model. Please refer to Figure 2 , the pretreatment unit includes a high-density sedimentation tank device and a first filtration device connected in series through pipes in sequence. Preferably, the pretreatment unit includes a fine grille assembly and a first regulation tank, and the fine grille assembly, the first regulation tank, and the high-density sedimentation tank device are connected in series through pipes in sequence. It can be understood that the working principle of the fine grille assembly is: a device composed of mutually parallel metal grille bars and a frame, which is installed obliquely on the channel to continuously remove debris in the fluid. The fine grille assembly can automatically intercept and remove various-shaped debris in the wastewater, protect the subsequent treatment equipment from being blocked or damaged by large-particle suspended solids and fibrous substances, and at the same time improve the uniformity of the wastewater and increase the treatment efficiency. During the discharge of wastewater, due to changes in the production situation, there are situations of uneven water quality and unstable water volume. In order to make the treatment process work properly without being affected by changes in peak wastewater flow or peak concentration, a first regulation tank can be set before the high-density sedimentation tank device, and the first regulation tank can adjust the water quality and water volume of the wastewater. A lift pump station can be set up to use a pump to pressurize and transport the effluent from the first regulation tank to the high-density sedimentation tank device. Preferably, a pH regulation tank can also be set between the high-density sedimentation tank device and the first filtration device to adjust the pH value of the wastewater.

[0029] Preferably, the first filtration device is connected to the first regulation tank through a first backwash drain pipe, and the ultrafiltration device is connected to the first regulation tank through a second backwash drain pipe to return the backwash water that has cleaned the first filtration device and the ultrafiltration device to the first regulation tank for reuse, saving water consumption. Cleaning the first filtration device and the ultrafiltration device can prevent blockage, ensure normal filtration, and improve the operation efficiency of the first filtration device and the ultrafiltration device. The first filtration device can be, for example, a V-shaped filter tank.

[0030] During the treatment process of wastewater by the high-density sedimentation tank device, sludge will be generated. The sludge treatment unit is connected to the high-density sedimentation tank device through a pipeline and is used to receive and treat the sludge discharged from the high-density sedimentation tank device. Specifically, the sludge treatment unit includes a slurry tank and a dehydrator. The high-density sedimentation tank device, the slurry tank, and the dehydrator are connected in series through pipelines in sequence. The sludge discharged from the high-density sedimentation tank device enters the slurry tank for adjustment and then enters the dehydrator. Before the sludge enters the dehydrator, a flocculant can be added through a chemical dosing unit. The flocculant can be added to the pipeline connecting the slurry tank and the dehydrator and mixed evenly through a pipeline mixer. The dehydrator can be, for example, a chamber diaphragm filter press. The filtrate of the chamber diaphragm filter press can be returned to the first regulation tank, and the cake produced by the chamber diaphragm filter press is transported out for disposal. The treatment scale of the sludge treatment unit in this embodiment can be 12 tons of dry mud (mud without any moisture) per day. The working system of the dehydrator is considered according to 1 shift per day and 12 h / shift, and it is required that the moisture content of the discharged mud ≤ 50%. For example, if the moisture content of the discharged mud is 50%, the daily discharged mud volume is: 12 / 0.5 = 24 (tons).

[0031] The stainless steel wastewater treatment system includes a control component, which is electrically connected to the high-density sedimentation tank device and the chemical dosing unit respectively and is used to control the influent flow rate, effluent flow rate of the high-density sedimentation tank device, and the chemical dosing amount of the chemical dosing unit. Further, the high-density sedimentation tank device includes a high-density sedimentation tank and a sight glass assembly. The high-density sedimentation tank is dosed by the chemical dosing unit. The sight glass assembly is connected to the high-density sedimentation tank. The sight glass assembly can include, for example, a floc sight glass. The sight glass assembly is used to monitor the high-density sedimentation tank device and form an image. The control component adjusts the influent flow rate, effluent flow rate of the high-density sedimentation tank device, and the chemical dosing amount of the chemical dosing unit according to the image observed by the sight glass assembly. Exemplarily, the chemicals added by the chemical dosing unit to the high-density sedimentation tank include coagulants, flocculants, lime, NaOH, and Na2CO3. The utility model has optimized the flow pattern design of the high-density sedimentation tank and realized the automatic control of operation parameters such as the influent flow rate, effluent flow rate, and chemical dosing amount of the high-density sedimentation tank through the control component, the chemical dosing unit, and the sight glass assembly. It can increase the hydraulic retention time, improve the sedimentation efficiency of suspended solids, significantly reduce the suspended solid content in the effluent, and can also automatically adjust the chemical dosing amount and the operation parameters of the high-density sedimentation tank according to the water quality change, so as to adapt to the changes of different water qualities and water volumes, ensure that the treatment effect is not affected, has strong adaptability, and can accurately control the chemical dosing amount, reduce chemical waste, and lower the operation cost.

[0032] Figure 3 is a schematic diagram of the advanced treatment unit in an embodiment of the utility model and can be referred to Figure 3, the advanced treatment unit is connected to the pretreatment unit through a pipeline. The advanced treatment unit includes an ultrafiltration device and a first reverse osmosis device connected in series through a pipeline in sequence. Further, the ultrafiltration device includes a second filtration device, an ultrafiltration module, and a first product water tank. The pretreatment unit, the second filtration device, the ultrafiltration module, the first product water tank, and the first reverse osmosis device are connected in series through a pipeline in sequence. It can be understood that the ultrafiltration module includes an ultrafiltration membrane for filtration. The ultrafiltration membrane is a polymer semi-permeable membrane that can separate polymer colloids or suspended particles of a certain size from a solution. The chemical dosing unit is used to add chemicals to the ultrafiltration module. The ultrafiltration module is connected to the first regulating tank through a second backwash drain pipe. The backwash water after cleaning the ultrafiltration module can be transported to the first regulating tank through the second backwash drain pipe for reuse. The second filtration device can be, for example, a self-cleaning filter. The backwash water after cleaning the second filtration device can be transported to the first regulating tank through a pipeline for reuse. A security filter can be provided between the first product water tank and the first reverse osmosis device. The water outlet of the first product water tank first enters the security filter and then enters the first reverse osmosis device.

[0033] It can be understood that the first reverse osmosis device will separately discharge concentrated brine and desalted water. The advanced treatment unit includes a second product water tank. The second product water tank is connected to the first reverse osmosis device through a pipeline and is used to receive the desalted water discharged by the first reverse osmosis device. The second product water tank plays a role in collecting, storing, and balancing the water quality and quantity. The second product water tank is connected to the production new water pipe network. The desalted water in the second product water tank can be supplemented as production new water to the production new water pipe network. Further, the advanced treatment unit includes a concentrated brine treatment device. The concentrated brine treatment device includes a blast furnace component. The blast furnace component is connected to the first reverse osmosis device through a pipeline and is used to perform slag flushing treatment on the concentrated brine discharged by the first reverse osmosis device. A second regulating tank can be provided between the blast furnace component and the first reverse osmosis device to play a role in homogenizing and equalizing the quantity. The concentrated brine discharged by the first reverse osmosis device first enters the second regulating tank and then enters the blast furnace component. The flushing water after flushing the first reverse osmosis device can be discharged into the first regulating tank through a pipeline for reuse.

[0034] In some other embodiments, the brine treatment device further includes a second reverse osmosis device. The first reverse osmosis device, the second reverse osmosis device, and the blast furnace assembly are connected in series through pipelines in sequence. The second reverse osmosis device is also connected to the second water production pool through a pipeline, so that the desalted water discharged from the second reverse osmosis device enters the second water production pool, and the concentrated brine discharged from the first reverse osmosis device enters the second reverse osmosis device for further treatment to reduce the quantity of the brine. Further, a concentrated brine pool is arranged between the first reverse osmosis device and the second reverse osmosis device, and a third regulating pool is arranged between the second reverse osmosis device and the blast furnace assembly. Both the concentrated brine pool and the third regulating pool play a role in balancing the water quality and quantity. The concentrated brine discharged from the second reverse osmosis device finally enters the blast furnace assembly for treatment. By arranging the two-stage reverse osmosis process in this way, the quantity of the brine is effectively reduced, and the subsequent slag flushing load is reduced. The desalted water discharged from the first reverse osmosis device and the desalted water discharged from the second reverse osmosis device can be mixed evenly in the second water production pool and then supplemented into the production new water pipe network as production new water.

[0035] The chemical dosing unit is respectively connected to the high-density sedimentation tank device, the ultrafiltration device, the first reverse osmosis device, and the sludge treatment unit. It can be understood that all the chemical dosing in the wastewater treatment system of this embodiment is completed by the chemical dosing unit. Specifically, the chemical dosing unit has multiple dosing ends, and the multiple dosing ends respectively lead to the ultrafiltration module, the first reverse osmosis device, the second reverse osmosis device, the high-density sedimentation tank, the sludge treatment unit, etc.

[0036] The pretreatment unit further includes a reused water pool. The first filtration device, the reused water pool, and the ultrafiltration device are connected in series through pipelines in sequence. The wastewater filtered by the first filtration device can directly enter the reused water pool, and the reused water pool plays a role in storing and balancing the water quality and quantity. The reused water pool is connected with a reused water pipeline. A part of the water discharged from the reused water pool enters the ultrafiltration device through a pipeline, and another part of the water discharged from the reused water pool enters the reused water pipeline for recycling, such as being recycled for sintering and solution treatment operations.

[0037] With the above configuration, the setting of the high-density sedimentation tank can improve the sedimentation efficiency of suspended solids, significantly reduce the content of suspended solids in the effluent, and has good effects on removing heavy metal ions in the wastewater, removing the hardness of the wastewater, and reducing turbidity; the ultrafiltration device further removes tiny suspended solids, colloids, macromolecular substances, etc. in the wastewater; a first reverse osmosis device is arranged at the rear end of the ultrafiltration device for desalination, so as to filter out most of the impurities and pollutants and obtain desalted water, and the desalted water can be supplemented into the production new water pipe network as production new water. In summary, the stainless steel wastewater treatment system of the present utility model can effectively remove most of the impurities and pollutants in the wastewater, the treated water quality can meet the standards stably, the treatment efficiency is high, the operation cost is low, and it can meet the environmental protection requirements and the demand for reclaimed water reuse.

[0038] It should be noted that the references to "an embodiment", "embodiment", "specific embodiment", "some embodiments", etc. in the specification only indicate that the described embodiments may include specific features, structures or characteristics. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, whether explicitly described or not, implementing such a feature, structure or characteristic in combination with other embodiments is within the knowledge of those skilled in the relevant art.

[0039] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0040] It should also be noted that although the present utility model has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present utility model. For any person skilled in the art, without departing from the scope of the technical solution of the present utility model, many possible changes and modifications can be made to the technical solution of the present utility model by using the technical content disclosed above, or it can be modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

[0041] It should also be understood that unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, rather than to represent the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0042] In addition, it should be recognized that the terms described herein are only used to describe specific embodiments and are not used to limit the scope of the present utility model. It must be noted that the singular forms "a" and "an" used herein and in the appended claims include plural references unless the context clearly indicates otherwise. For example, the reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. Also, the word "or" should be understood to have the definition of logical "or", rather than the definition of logical "exclusive or", unless the context clearly indicates otherwise. In addition, the implementation of the method and / or device in the embodiments of the present utility model may include performing the selected tasks manually, automatically or in combination.

Claims

1. A stainless steel wastewater treatment system, characterized in that, Comprising: A pretreatment unit, which includes a high-density sedimentation tank device and a first filtration device connected in series through a pipeline in sequence. A deep treatment unit, which is connected to the pretreatment unit through a pipeline. The deep treatment unit includes an ultrafiltration device and a first reverse osmosis device connected in series through a pipeline in sequence. A sludge treatment unit, which is connected to the high-density sedimentation tank device through a pipeline. A chemical dosing unit, which is respectively connected to the high-density sedimentation tank device, the ultrafiltration device, the first reverse osmosis device and the sludge treatment unit.

2. The stainless steel wastewater treatment system according to claim 1, characterized in that, The stainless steel wastewater treatment system includes a control component, which is respectively electrically connected to the high-density sedimentation tank device and the chemical dosing unit, and is used to control the influent flow rate, effluent flow rate of the high-density sedimentation tank device and the chemical dosing amount of the chemical dosing unit.

3. The stainless steel wastewater treatment system according to claim 2, wherein The high-density sedimentation tank device includes a high-density sedimentation tank and a sight glass assembly. The sight glass assembly is connected to the high-density sedimentation tank. The sight glass assembly is used to monitor the high-density sedimentation tank device and form an image. The control component adjusts the influent flow rate, effluent flow rate of the high-density sedimentation tank device and the chemical dosing amount of the chemical dosing unit according to the image observed by the sight glass assembly.

4. The stainless steel wastewater treatment system according to claim 1, characterized in that, The deep treatment unit includes a concentrated brine treatment device, which includes a blast furnace assembly. The blast furnace assembly is connected to the first reverse osmosis device through a pipeline and is used for slag washing treatment of the concentrated brine discharged from the first reverse osmosis device.

5. The stainless steel wastewater treatment system according to claim 4, characterized in that, The concentrated brine treatment device includes a second reverse osmosis device. The first reverse osmosis device, the second reverse osmosis device and the blast furnace assembly are connected in series through a pipeline in sequence.

6. The stainless steel wastewater treatment system according to claim 1, characterized in that, The sludge treatment unit includes a slurry tank and a dehydrator. The high-density sedimentation tank device, the slurry tank and the dehydrator are connected in series through a pipeline in sequence.

7. The stainless steel wastewater treatment system according to claim 1, wherein, The pretreatment unit includes a fine grid assembly and a first regulating tank. The fine grid assembly, the first regulating tank and the high-density sedimentation tank device are connected in series through a pipeline in sequence.

8. The stainless steel wastewater treatment system according to claim 7, wherein, The first filtration device is connected to the first regulating tank through a first backwash drain pipe, and the ultrafiltration device is connected to the first regulating tank through a second backwash drain pipe.

9. The stainless steel wastewater treatment system according to claim 1, characterized in that, The ultrafiltration device includes a second filtration device, an ultrafiltration component and a first product water tank. The pretreatment unit, the second filtration device, the ultrafiltration component, the first product water tank and the first reverse osmosis device are connected in series through a pipeline in sequence. The chemical dosing unit is used to add chemicals to the ultrafiltration component.

10. The stainless steel wastewater treatment system according to claim 1, characterized in that, The pretreatment unit includes a reused water tank. The first filtration device, the reused water tank and the ultrafiltration device are connected in series through a pipeline in sequence. The reused water tank is connected with a reused water pipeline. A part of the effluent of the reused water tank enters the ultrafiltration device through a pipeline, and another part of the effluent of the reused water tank enters the reused water pipeline for recycling; the deep treatment unit includes a second product water tank, which is connected to the first reverse osmosis device through a pipeline and is used to receive the demineralized water discharged from the first reverse osmosis device.

Images