Device for removing heavy metals in high-salinity wastewater

Abstract

A device for removing heavy metals in high-salinity wastewater relates to the technical field of chemical equipment and comprises heavy metal wastewater, a granular bed separator, a pH regulating tank, a primary coagulation reaction tank, a primary sedimentation tank, a secondary coagulation reaction tank, a secondary sedimentation tank and a sand carbon filter which are sequentially connected through pipelines. According to the device for removing the heavy metal content in the high-salinity wastewater, through a series of operations of the pH regulating tank, the two coagulation reaction tanks and the two sedimentation tanks, the work of removing the heavy metal in the high-salinity wastewater is efficiently completed in a high-quality manner, so that the wastewater and sludge are discharged or transported after reaching the standard.

Description

Technical field:

[0001] The utility model relates to the technical field of chemical equipment, in particular to a device for removing heavy metal content from high-salt wastewater. Background technology:

[0002] my country's chemical companies produce a large amount of high-salt industrial wastewater during the production process. We collected a variety of typical industrial wastewater samples for water sample analysis and found that heavy metals are commonly found in high-salt wastewater. It is crucial to remove heavy metals from the wastewater. The existing treatment methods are complex and costly, which is not in line with the development of modern society. Utility model content:

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and to provide a device for removing heavy metal content in high-salt wastewater. Although the equipment it adopts is simple, it can achieve high-efficiency and high-quality heavy metal removal work.

[0004] In order to solve the problems existing in the background technology, the utility model adopts the following technical scheme: it includes heavy metal wastewater, a coagulation reaction tank and a sedimentation tank, the coagulation reaction tank includes a primary coagulation reaction tank and a secondary coagulation reaction tank, the sedimentation tank includes a primary sedimentation tank and a secondary sedimentation tank, the heavy metal wastewater is connected to a particle bed separator through a pipeline, the particle bed separator is connected to a pH adjustment tank through a pipeline, the pH adjustment tank is connected to the primary coagulation reaction tank through a pipe, the primary coagulation reaction tank is connected to the primary sedimentation tank through a pipeline, the primary sedimentation tank is connected to the secondary coagulation reaction tank through a pipeline, the secondary coagulation reaction tank is connected to the secondary sedimentation tank through a pipeline, the secondary sedimentation tank is connected to a sand-carbon filter tank through a pipeline, and the sand-carbon filter tank is connected to an intermediate water tank through a pipeline; the primary sedimentation tank and the secondary sedimentation tank are respectively connected to a sludge concentrator through a pipeline, the sludge concentrator is connected to a filter press through a pipeline, and the filter press is respectively connected to the intermediate water tank and the mud cake transport through pipelines.

[0005] The pH regulating pool is connected to the acid-base dosing tank through a pipeline, and the acid-base dosing tank contains acidic liquid and alkaline liquid separately.

[0006] The primary coagulation reaction tank and the secondary coagulation reaction tank are connected to the primary dosing tank and the secondary dosing tank respectively through pipelines.

[0007] The beneficial effects of the utility model are safety and reliability. Through a series of operations including a pH adjustment tank, two coagulation reaction tanks and two sedimentation tanks, the work of removing heavy metals from high-salt wastewater is completed with high efficiency and high quality, so that the wastewater and sludge are discharged or transported after meeting the standards. Description of the drawings:

[0008] Figure 1 It is a schematic diagram of the structure of the utility model. Specific implementation method:

[0009] Reference Figure 1 The utility model specifically adopts the following implementation mode: including heavy metal wastewater, coagulation reaction tank and sedimentation tank, the coagulation reaction tank includes a primary coagulation reaction tank and a secondary coagulation reaction tank, the sedimentation tank includes a primary sedimentation tank and a secondary sedimentation tank, the heavy metal wastewater is connected to a particle bed separator through a pipeline, the particle bed separator is connected to a pH adjustment tank through a pipeline, the pH adjustment tank is connected to a primary coagulation reaction tank through a pipe, the primary coagulation reaction tank is connected to a primary sedimentation tank through a pipeline, the primary sedimentation tank is connected to a secondary coagulation reaction tank through a pipeline, the secondary coagulation reaction tank is connected to a secondary sedimentation tank through a pipeline, the secondary sedimentation tank is connected to a sand carbon filter tank through a pipeline, and the sand carbon filter tank is connected to an intermediate water tank through a pipeline; the primary sedimentation tank and the secondary sedimentation tank are respectively connected to a sludge concentrator through a pipeline, the sludge concentrator is connected to a filter press through a pipeline, and the filter press is respectively connected to an intermediate water tank and mud cake transport through a pipeline. The pH adjustment tank is connected to an acid-base dosing tank through a pipeline, and the acid-base dosing tank includes acidic and alkaline liquids separately. The primary coagulation reaction tank and the secondary coagulation reaction tank are connected to the primary dosing tank and the secondary dosing tank respectively through pipelines.

[0010] When this device for removing heavy metal content from high-salt wastewater is used, the heavy metals in the wastewater cannot be decomposed and destroyed by various common methods, but can only be transferred to their existing positions and their physical and chemical forms. After precipitation treatment in the primary sedimentation tank and the secondary sedimentation tank, the heavy metals in the wastewater are transformed from the dissolved ion state into insoluble compounds and precipitated, and transferred from the water to the sludge; after ion exchange treatment, the metal ions in the wastewater are transferred to the ion exchange resin; after regeneration, they are transferred from the ion exchange resin to the regenerated waste liquid. After treatment, the heavy metal wastewater forms two products, one is the treated water that basically removes the heavy metals, and the other is the concentrated product of the heavy metals. The treated water with a heavy metal concentration lower than the discharge standard can be discharged; if it meets the requirements for production process water, it can be reused. Most of the heavy metals in the concentrated product have use value and should be recycled as much as possible; those without recycling value should be treated harmlessly.

[0011] The heavy metal wastewater first enters the particle bed separator to remove the particulate matter in the wastewater, and then is transported to the pH adjustment tank through the elevator. By adding caustic soda flakes, compound alkali and other pH neutralizers to adjust the pH value of the same heavy metal ion wastewater to the heavy metal, or the wastewater containing multiple metal ions is adjusted in stages. Then it passes through the primary coagulation reaction tank, the primary sedimentation tank, the secondary coagulation reaction tank and the secondary sedimentation tank in turn to form precipitated sludge. The precipitated sludge finally enters the sand carbon filter tank through a pipeline for filtration, and the filtered wastewater enters the intermediate water tank. The sludge produced in the primary sedimentation tank and the secondary sedimentation tank enters the sludge concentrator and filter press at one time, and the formed mud cake is transported out, and the produced wastewater enters the intermediate water tank, thus completing the work of removing heavy metals from high-salt wastewater.

[0012] The primary coagulation reaction tank and the secondary coagulation reaction tank are used to add flocculants to make the small colloidal particles in the wastewater less stable, aggregate to form large colloidal particles, and finally precipitate the heavy metals through gravity. The added flocculants are added to the primary coagulation reaction tank and the secondary coagulation reaction tank through the primary dosing tank and the secondary dosing tank respectively.

[0013] In summary, the device for removing heavy metal content from high-salt wastewater is safe and reliable. Through a series of operations including a pH adjustment tank, two coagulation reaction tanks and two sedimentation tanks, it can efficiently and high-quality complete the work of removing heavy metals from high-salt wastewater, so that the wastewater and sludge can be discharged or transported after meeting the standards.

Claims

1. A device for removing heavy metal content from high-salinity wastewater, characterized in that: It includes heavy metal wastewater, a coagulation reaction tank and a sedimentation tank. The coagulation reaction tank includes a primary coagulation reaction tank and a secondary coagulation reaction tank. The sedimentation tank includes a primary sedimentation tank and a secondary sedimentation tank. The heavy metal wastewater is connected to a particle bed separator through a pipeline, the particle bed separator is connected to a pH regulating tank through a pipeline, the pH regulating tank is connected to the primary coagulation reaction tank through a pipe, the primary coagulation reaction tank is connected to the primary sedimentation tank through a pipeline, the primary sedimentation tank is connected to the secondary coagulation reaction tank through a pipeline, the secondary coagulation reaction tank is connected to the secondary sedimentation tank through a pipeline, the secondary sedimentation tank is connected to a sand-carbon filter tank through a pipeline, and the sand-carbon filter tank is connected to an intermediate water tank through a pipeline; the primary sedimentation tank and the secondary sedimentation tank are respectively connected to a sludge concentrator through pipelines, the sludge concentrator is connected to a filter press through a pipeline, and the filter press is respectively connected to the intermediate water tank and mud cake transportation through pipelines.

2. The device for removing heavy metal content from high-salinity wastewater according to claim 1, characterized in that: The pH regulating pool is connected to the acid-base dosing tank through a pipeline, and the acid-base dosing tank contains acidic liquid and alkaline liquid separately.

3. The device for removing heavy metal content from high-salinity wastewater according to claim 1, characterized in that: The primary coagulation reaction tank and the secondary coagulation reaction tank are connected to the primary dosing tank and the secondary dosing tank respectively through pipelines.

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