Heavy metal ion wastewater treatment system

Abstract

The utility model discloses a heavy metal ion wastewater treatment system, which relates to the technical field of wastewater treatment, and comprises a wastewater collection device, a solid-liquid separation device, a heavy metal ion treatment device, a membrane filtration device, a sediment collection device and a produced water collection device, the solid-liquid separation device is connected with a water outlet of the wastewater collection device; the heavy metal ion treatment device is connected with a water outlet of the solid-liquid separation device and is used for combining heavy metal ions in the wastewater with a complexing agent to obtain wastewater containing a complex; the membrane filtration device is connected with a water outlet of the heavy metal ion treatment device and is used for filtering a complex in the wastewater to obtain membrane filtration concentrated water and membrane filtration produced water; the sediment collecting device is connected with a concentrated water outlet of the membrane filtering device; and the produced water collecting device is connected with a produced water outlet of the membrane filtering device. According to the utility model, heavy metal ion wastewater can be recycled, and the production cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, and particularly relates to a heavy metal ion wastewater treatment system. Background Art

[0002] During the entire production process of mining enterprises, wastewater is discharged. This wastewater mainly contains heavy metal ions such as antimony, copper, lead, zinc, cadmium, arsenic, and chromium. If discharged without treatment, it is very easy to cause heavy metal pollution incidents such as arsenic pollution, cadmium pollution, and lead pollution that affect the ecological environment.

[0003] In related technologies, the traditional treatment methods for heavy metal ion wastewater mainly include the precipitation method. Its main process is: adding alkali or sulfide in the wastewater tank for neutralization precipitation, then using a complexing agent for precipitation in the sedimentation tank, and then discharging through clear water.

[0004] The above solution can remove heavy metal ions in the wastewater. Although the treated water quality meets the discharge requirements, it is difficult to meet the requirements for reuse by mining enterprises. Mining enterprises have a large daily water consumption. Directly discharging the treated heavy metal ion wastewater will result in high production costs for the enterprises. Summary of the Utility Model

[0005] Embodiments of the utility model provide a heavy metal ion wastewater treatment system to solve the technical problem that heavy metal ion wastewater is difficult to reuse in related technologies.

[0006] Embodiments of the utility model provide a heavy metal ion wastewater treatment system, including:

[0007] A wastewater collection device for storing industrial wastewater;

[0008] A solid-liquid separation device connected to the water outlet of the wastewater collection device;

[0009] A heavy metal ion treatment device connected to the water outlet of the solid-liquid separation device, for combining heavy metal ions in the wastewater with a complexing agent to obtain wastewater containing complexes;

[0010] A membrane filtration device connected to the water outlet of the heavy metal ion treatment device, for filtering the complexes in the wastewater to obtain membrane filtration concentrated water and membrane filtration produced water;

[0011] A precipitation collection device connected to the concentrated water outlet of the membrane filtration device;

[0012] A produced water collection device connected to the produced water outlet of the membrane filtration device.

[0013] In some embodiments, a pH adjustment device is provided between the solid-liquid separation device and the heavy metal ion treatment device.

[0014] In some embodiments, a pH detection device is provided on the pipeline between the pH adjustment device and the heavy metal ion treatment device.

[0015] In some embodiments, the wastewater treatment system further includes:

[0016] A reverse osmosis device, which is connected to the water production outlet of the membrane filtration device. The water production outlet of the reverse osmosis device is connected to the water production collection device, and the concentrated water outlet of the reverse osmosis device is connected to the water inlet of the wastewater collection device.

[0017] In some embodiments, the reverse osmosis membrane in the reverse osmosis device is a cellulose acetate membrane or a polyamide membrane.

[0018] In some embodiments, a complexing agent adding component is provided inside the heavy metal ion treatment device.

[0019] In some embodiments, a stirring component is provided inside the heavy metal ion treatment device.

[0020] In some embodiments, the wastewater treatment system further includes: a sewage pump, which is connected to the sewage outlet of the sediment collection device.

[0021] In some embodiments, the solid-liquid separation device is a centrifugal dehydrator.

[0022] In some embodiments, the filter membrane of the membrane filtration device is a ceramic sintered membrane or an organic synthetic membrane.

[0023] The beneficial effects brought by the technical solution provided by the present utility model include:

[0024] The embodiment of the present utility model provides a heavy metal ion wastewater treatment system. By setting a solid-liquid separation device, a heavy metal ion treatment device and a membrane filtration device, the solid-liquid separation device performs preliminary solid-liquid separation. Then, the heavy metal ions are combined with a complexing agent through the heavy metal ion treatment device. Finally, the complex in the wastewater is filtered and removed through the membrane filtration device to obtain membrane filtration produced water. The water quality of the membrane filtration produced water is high, which can be introduced into the production line for repeated use, saving production costs. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1Schematic diagram of the heavy metal ion wastewater treatment system provided by the embodiments of the present invention. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] The embodiments of the present invention provide a heavy metal ion wastewater treatment system, which can solve the technical problem that heavy metal ion wastewater is difficult to reuse.

[0029] Refer to Figure 1 As shown, a heavy metal ion wastewater treatment system includes: a wastewater collection device, a solid-liquid separation device, a heavy metal ion treatment device, a membrane filtration device, a precipitation collection device, and a produced water collection device.

[0030] The wastewater collection device is used to collect industrial wastewater. The solid-liquid separation device is connected to the water outlet of the wastewater collection device and is used to preliminarily treat the industrial wastewater to remove large particle solids. The heavy metal ion treatment device is connected to the water outlet of the solid-liquid separation device and is used to combine heavy metal ions in the wastewater with a complexing agent to obtain wastewater containing a complex. The membrane filtration device is connected to the water outlet of the heavy metal ion treatment device and is used to filter the complex in the wastewater to obtain membrane filtration concentrate water and membrane filtration produced water. The precipitation collection device is connected to the concentrate water outlet of the membrane filtration device. After the concentrate water of the membrane filtration device is allowed to stand in the precipitation collection device, the water above the precipitation collection device can be introduced back into the wastewater collection device for repeated treatment. The produced water collection device is connected to the produced water outlet of the membrane filtration device. The membrane filtration produced water collected by the produced water collection device has a quality that meets the production requirements and can be introduced back into the production line for use.

[0031] In the heavy metal ion wastewater treatment system of the embodiments of the present invention, by providing a solid-liquid separation device, a heavy metal ion treatment device, and a membrane filtration device, the solid-liquid separation device performs preliminary solid-liquid separation, then the heavy metal ion treatment device combines heavy metal ions with a complexing agent, and finally the complex in the wastewater is filtered out by the membrane filtration device to obtain membrane filtration produced water. The quality of the membrane filtration produced water is high, and it can be introduced back into the production line for reuse, saving production costs.

[0032] As an optional implementation manner, a pH adjustment device is provided between the solid-liquid separation device and the heavy metal ion treatment device. The pH adjustment device can adjust the pH value of the heavy metal ion wastewater, which helps the subsequent combination of heavy metal ions and complexing agents to form complex precipitates. Preferably, hydrochloric acid or sodium hydroxide is used in the pH adjustment device to adjust the pH value of the wastewater. Further, a pH detection device is provided on the pipeline between the pH adjustment device and the heavy metal ion treatment device. The pH detection device can detect the wastewater after being adjusted by the pH adjustment device to make the pH value of the wastewater meet the treatment requirements of the subsequent heavy metal ion treatment device.

[0033] As an optional implementation manner, the heavy metal ion wastewater treatment system in the embodiment of the present utility model further includes a reverse osmosis device. The reverse osmosis device is connected to the water production outlet of the membrane filtration device. The water production outlet of the reverse osmosis device is connected to the water production collection device, and the concentrated water outlet of the reverse osmosis device is connected to the water inlet of the wastewater collection device. The reverse osmosis device can further remove impurities such as inorganic ions, organic substances, and colloids in the water produced by the membrane filtration device, and further improve the quality of the produced water. Preferably, the reverse osmosis membrane in the reverse osmosis device is a cellulose acetate membrane or a polyamide membrane. The cellulose acetate membrane or the polyamide membrane has mature technology and low use cost.

[0034] As an optional implementation manner, a complexing agent addition component is provided in the heavy metal ion treatment device. As the complexing agent is continuously consumed, the complexing agent addition component can replenish the complexing agent in real time to meet the requirements for treating heavy metal ions in the heavy metal ion treatment device.

[0035] As an optional implementation manner, a stirring component is provided in the heavy metal ion treatment device. The stirring component can promote the effect and rate of the combination of heavy metal ions and complexing agents in the heavy metal ion treatment device, thereby improving the treatment effect and rate of the wastewater.

[0036] As an optional implementation manner, the heavy metal ion wastewater treatment system in the embodiment of the present utility model further includes a sewage pump. The sewage pump is connected to the sewage outlet of the sediment collection device to suck and discharge the sludge deposited in the sediment collection device.

[0037] As an optional implementation manner, the solid-liquid separation device is a centrifugal dehydrator. The centrifugal dehydrator has a compact structure, small weight, few faults, low noise and vibration, simple operation, long service life, and is also convenient for maintenance and replacement.

[0038] As an alternative embodiment, the filter membrane of the membrane filtration device is a ceramic sintered membrane or an organic synthetic membrane. Ceramic membranes have the advantages of good chemical stability, being resistant to acids, alkalis, and organic solvents, high mechanical strength, and high separation efficiency. Organic synthetic membranes have the advantages of wide material sources, low manufacturing cost per unit membrane area, and high packing density of membrane modules.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] It should be noted that in the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

[0041] The above are only the specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather should conform to the broadest scope consistent with the principles and novel features of the present utility model.

Claims

1. A heavy metal ion wastewater treatment system, characterized in that: include: Wastewater collection device, which is used to collect industrial wastewater; A solid-liquid separation device connected to the water outlet of the wastewater collection device; A heavy metal ion treatment device, which is connected to the water outlet of the solid-liquid separation device and is used to combine the heavy metal ions in the wastewater with the complexing agent to obtain wastewater containing the complex; A membrane filtration device, which is connected to the water outlet of the heavy metal ion treatment device and is used to filter the complex in the wastewater to obtain membrane filtration concentrated water and membrane filtration produced water; A sedimentation collection device connected to the concentrated water outlet of the membrane filtration device; A produced water collecting device is connected to the produced water outlet of the membrane filtration device.

2. A heavy metal ion wastewater treatment system as claimed in claim 1, characterized in that: A pH regulating device is provided between the solid-liquid separation device and the heavy metal ion treatment device.

3. A heavy metal ion wastewater treatment system as claimed in claim 2, characterized in that: A pH detection device is provided on the pipeline between the pH adjusting device and the heavy metal ion treatment device.

4. A heavy metal ion wastewater treatment system as claimed in claim 1, characterized in that: Also includes: A reverse osmosis device is connected to the water production outlet of the membrane filtration device, the water production outlet of the reverse osmosis device is connected to the water production collection device, and the concentrated water outlet of the reverse osmosis device is connected to the water inlet of the wastewater collection device.

5. A heavy metal ion wastewater treatment system as claimed in claim 4, characterized in that: The reverse osmosis membrane in the reverse osmosis device is a cellulose acetate membrane or a polyamide membrane.

6. A heavy metal ion wastewater treatment system as claimed in claim 1, characterized in that: The heavy metal ion treatment device is provided with a complexing agent adding component.

7. A heavy metal ion wastewater treatment system as claimed in claim 1, characterized in that: A stirring component is arranged in the heavy metal ion treatment device.

8. A heavy metal ion wastewater treatment system as claimed in claim 1, characterized in that: Also includes: A sewage pump is connected to the sewage outlet of the sediment collection device.

9. A heavy metal ion wastewater treatment system as claimed in claim 1, characterized in that: The solid-liquid separation device is a centrifugal dehydrator.

10. A heavy metal ion wastewater treatment system as claimed in claim 1, characterized in that: The filter membrane of the membrane filter device is a ceramic sintered membrane or an organic synthetic membrane.

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