A device for adsorbing and removing heavy metal mercury ions in sewage

Abstract

The utility model discloses a device for adsorbing and removing heavy metal mercury ions in sewage, which belongs to the field of adsorbing and removing heavy metal ions in sewage. The device comprises: a tank body and a reactor, a water inlet pipe inserted into a filter pool inside the tank body is arranged between the tank body and the reactor, a slow flow plate is arranged on the inner wall of the filter pool, and one side of the filter pool is a weak acid washing pool, a strong acid washing pool and a reuse pool arranged inside the tank body in sequence, and a compensation waterway is arranged at the top of the weak acid washing pool, the strong acid washing pool and the reuse pool. The device can realize the enrichment of heavy metal mercury ions and non-mercury ions respectively, and the treated sewage can be recycled.

Description

Technical Field

[0001] The utility model relates to the field of adsorption and removal of heavy metal ions in sewage, in particular to a device for adsorption and removal of heavy metal mercury ions in sewage. Background Art

[0002] The common practice for recovering heavy metal resources in waste liquid, such as water, is enrichment. Since the mud, waste residue, etc. generated during the treatment of heavy metal waste liquid are still hazardous solid wastes, as the "classification pretreatment + secondary treatment + terminal adsorption" waste liquid hazard reduction and reduction treatment idea proposed by the Eco-Environmental Research Center of the Chinese Academy of Sciences, the "hazard reduction" of waste liquid in the "classification pretreatment" stage can avoid or reduce the generation of secondary hazardous wastes. For this reason, the enrichment of heavy metals needs to be carried out under "complex working conditions". The composition and output of waste liquids in petrochemical enterprises change with the production tasks, and the heavy metal content composition fluctuates greatly. There are often other types of pollutants in the wastewater, such as solid particulate matter, water-soluble organic pollutants, etc. The waste liquid production conditions are complex, and it is difficult to recover heavy metal resources economically and efficiently. In addition, most heavy metal pollutants belong to Class I pollutants, such as chromium, cadmium, mercury, lead, nickel, etc., and their emission limits are very low, mostly at 1 mg·L -1 The following are the mercury emission limits, which are extremely low. This shows that: while enriching heavy metals, heavy metal pollutants in waste liquid should be deeply removed; the recycling of mercury pollutants is the focus and difficulty of heavy metal waste liquid treatment.

[0003] Since the emission limit of mercury pollution is very low and the treatment is difficult, efficient mercury removal has become the focus of "risk reduction" of heavy metal waste liquid, and the development of selective mercury removal adsorption materials has become a hot topic. Studies have shown that by exploring the influence of the composition structure of PAT-MNPs on adsorption performance and optimizing the preparation method of PAT-MNPs, it is possible to obtain heavy metal enrichment and heavy metal waste liquid "risk reduction" adsorption materials with large adsorption capacity, fast adsorption speed, strong mercury ion preferential adsorption ability, low preparation cost, and good stability, such as chemical and mechanical stability. The modified material is used for the development of heavy metal mercury ion adsorption and enrichment process to achieve efficient enrichment of heavy metal mercury ions.

[0004] There are methods for purifying sewage in the prior art. For example, Japanese invention patent WOJP22015184 discloses a sewage purification device having a sewage purification contact filter tank and an electrolytic cell. Ammonia in sewage can be easily removed by electrolysis, but the device still has room for improvement.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Utility Model Content

[0006] In view of the problems existing in the prior art, the utility model provides a device for adsorbing and removing heavy metal mercury ions in sewage, which can enrich heavy metal mercury ions and non-mercury ions respectively, and the treated sewage can be recycled.

[0007] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0008] A device for adsorbing and removing heavy metal mercury ions in sewage comprises a tank body and a reactor, a water inlet pipe inserted into a filter pool inside the tank body is arranged between the tank body and the reactor, a slow flow plate is arranged on the inner wall of the filter pool, and one side of the filter pool is provided with a weak acid washing tank, a strong acid washing tank and a reuse tank which are arranged inside the tank body and are interconnected, and a compensating waterway is arranged at the top of the weak acid washing tank, the strong acid washing tank and the reuse tank.

[0009] According to one embodiment of the utility model, the trough body is a structure with an opening at one end and a partitioned cavity inside, which divides the inside of the trough body into several working areas. A cover plate is provided at the open end of the trough body to prevent external dust and debris from falling into the trough body, and a peephole is provided on the cover plate for observing the working conditions in the trough.

[0010] According to one embodiment of the utility model, a sewage flow retarder and a sewage diverting diverter are provided at one end of the water inlet pipe inserted into the trough body. The sewage flow retarder is installed inside the end of the water inlet pipe away from the reactor. The sewage flow retarder is a pipe sleeve-like structure with through holes at both ends that gradually taper to one side, and is used to slow down the flow rate of sewage flowing through. A disc structure with a horizontal surface higher than the center is connected under the pipe sleeve-like structure. A gap is provided between the disc structure and the pipe sleeve-like structure. When sewage flows through, it will not immediately flow into the filter tank, but first impact the disc structure on the sewage flow retarder. The special structure of the disc will cause the sewage to reflux slightly, thereby having the effect of slowing down the flow rate of the sewage.

[0011] According to one embodiment of the utility model, the sewage diverter is a sleeve-like structure with a through hole at the top and through holes around the side wall. An annular hole is provided at the bottom of the sewage diverter. The sewage diverter is spirally installed on the water inlet pipe. The sewage flowing from the sewage slow flow device into the sewage diverter will flow into the filter tank in different directions from the through holes distributed on the sewage diverter, so as to prevent the sewage flowing into the filter tank from continuously impacting the inner wall of the tank in one direction.

[0012] According to one embodiment of the utility model, the filtration tank, the weak acid washing tank, the strong acid washing tank and the reuse tank are separated by a one-way membrane so that the sewage can only flow in one direction, and the enrichment of metal ions is completed according to the established work flow. The non-mercury ions in the sewage pickled in the weak acid washing tank will be enriched in the non-mercury ion enrichment tank, and the mercury ions in the sewage pickled in the strong acid washing tank will be enriched in the mercury ion enrichment tank. A weak acid detection module and a weak acid circulation system are installed inside the weak acid washing tank, and a strong acid detection module and a strong acid circulation system are installed inside the strong acid washing tank, which are used to detect the acidity and pH value of the sewage inside the pickling tank. When the detected acid concentration and pH value do not meet the pickling conditions, the weak acid circulation system and the strong acid circulation system can be interlocked and started respectively, and the recycled water is extracted from the reuse tank and transported to the weak acid washing tank and the strong acid washing tank through the compensation waterway to ensure that the acid concentration and pH value in the pickling tank meet the pickling requirements.

[0013] According to one embodiment of the utility model, the compensation waterway is a tubular structure with three openings, and the three openings are respectively connected to the weak pickling tank, the strong pickling tank and the reuse tank. When the pH value and the PH value of the sewage in the pickling tank do not meet the pickling conditions, the weak acid circulation system and the strong acid circulation system control the recovery water to be transported to the pickling tank through the compensation waterway to ensure that the acid concentration and the PH value in the pickling meet the working requirements.

[0014] According to one embodiment of the utility model, the slow flow plate is a plate-like structure installed on the inner side wall of the filter tank. The slow flow plate has an angle with the horizontal plane. This structure can buffer the sewage when it falls into the filter tank, avoiding the continuous impact of the sewage on the filter box.

[0015] According to one embodiment of the utility model, the lower part of the reactor is a columnar structure and the upper part is a hemisphere. The interior of the reactor has a grid-like cavity, which can make the reaction process in the reactor more complete. The reactor is equipped with an adsorption filler and a liquid level gauge. The liquid level gauge is used to monitor and protect the liquid level of the reactor so that the liquid level in the reactor is not too high or too low. The adsorption material in the reactor is PAT-MNPs, which is obtained by using Fe3O4@SiO2 as a magnetic core, modifying MNPs with a silane coupling agent or polyvinyl pyrrolidone, and polymerizing AT and coating MNPs under the action of CuCl2.

[0016] According to one embodiment of the utility model, a suction port and a discharge port are installed on the outside of the reactor. After sedimentation, isolation and flotation, the sewage enters the reactor equipped with adsorption filler through the suction port and the suction control valve, and is then discharged into the filter tank through the discharge port and the discharge control valve for further filtration. A suction control valve is installed on the suction port, and a discharge control valve is provided on the discharge port to control the flow rate of the sewage.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model uses a sewage flow retarder and a sewage diverter to reduce the water pressure of sewage entering the filter tank. A flow retarder is arranged on the inner wall of the filter tank to further buffer the sewage and protect the tank body. The device enriches non-mercury ions and mercury ions respectively through a weak pickling process and a strong pickling process. A compensation waterway is arranged at the top of the weak pickling tank, the strong pickling tank and the reuse tank. When the acidity and pH value of the sewage in the pickling tank do not meet the pickling conditions, the weak acid circulation system and the strong acid circulation system can be interlocked and started respectively, and the recovered water is extracted from the reuse tank and transported to the weak pickling tank and the strong pickling tank through the compensation waterway to ensure that the acid concentration and pH value in the pickling tank meet the pickling requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the process scheme of the utility model;

[0021] Figure 2 This is a schematic diagram of the reactor scheme of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal flow of the tank body of the utility model;

[0023] Figure 4 It is a schematic diagram of the sewage slow flow device and sewage diverter diverter of the utility model;

[0024] Figure 5 This is a schematic diagram of the water inlet pipe structure of the utility model.

[0025] Figure numbers: 10-reactor; 101-intake port; 102-intake control valve; 103-discharge port; 104-discharge control valve; 105-adsorption filler; 106-liquid level gauge; 20-water inlet pipe; 201-sewage retarder; 202-sewage diverter; 301-retarder plate; 302-filter tank; 303-filter box; 304-weak acid washing tank; 305-non-mercury ion enrichment tank; 306-strong acid washing tank; 307-mercury ion enrichment tank; 308-reuse tank; 309-peephole; 310-unidirectional membrane; 320-compensation waterway; 401-weak acid detection module; 402-weak acid circulation system; 403-strong acid circulation system; 404-strong acid detection module. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0028] Embodiment 1

[0029] The utility model provides a device for adsorbing and removing heavy metal mercury ions in sewage, comprising a tank body and a reactor 10, wherein a water inlet pipe 20 inserted into a filter pool 302 inside the tank body is arranged between the tank body and the reactor 10, a slow flow plate 301 is arranged on the inner wall of the filter pool 302, and a weak acid washing pool 304, a strong acid washing pool 306 and a reuse pool 308 are arranged in sequence inside the tank body and interconnected on one side of the filter pool 302, and a compensating waterway 320 is arranged at the top of the weak acid washing pool 304, the strong acid washing pool 306 and the reuse pool 308.

[0030] The trough body is a structure with an opening at one end and a spaced cavity inside, which divides the inside of the trough body into several working areas. A cover plate is provided at the open end of the trough body to prevent external dust and debris from falling into the trough body. A peephole 309 is provided on the cover plate for observing the working conditions in the trough.

[0031] One end of the water inlet pipe 20 inserted into the trough body is provided with a sewage slow flow device 201 and a sewage diverting diverter 202. The sewage slow flow device 201 is installed inside the end of the water inlet pipe 20 away from the reactor 10. The sewage slow flow device 201 is a pipe sleeve-like structure with through holes at both ends that gradually taper to one side, and is used to slow down the flow rate of sewage flowing through. A disc structure with a higher level than the center is connected under the pipe sleeve-like structure. A gap is provided between the disc structure and the pipe sleeve-like structure. When sewage flows through, it will not immediately flow into the filter tank, but first impact the disc structure on the sewage slow flow device 201. The special structure of the disc will cause the sewage to reflux slightly, thereby having the effect of slowing down the flow rate of the sewage.

[0032] The sewage diverter diverter 202 is a sleeve-like structure with a through hole at the top and through holes around the side wall. An annular hole is provided at the bottom of the sewage diverter diverter 202. The sewage diverter diverter 202 is spirally installed on the water inlet pipe 20. The sewage flowing from the sewage slow flow device 201 into the sewage diverter diverter 202 will flow into the filter tank 302 in different directions from the through holes distributed on the sewage diverter diverter 202, so as to prevent the sewage flowing into the filter tank 302 from continuously impacting the inner wall of the tank body in one direction.

[0033] The filtration tank 302, the weak acid washing tank 304, the strong acid washing tank 306 and the reuse tank 308 are separated by a one-way membrane 310, so that the sewage can only flow in one direction, and the enrichment of metal ions is completed according to the established work flow. A weak acid detection module 401 and a weak acid circulation system 402 are installed inside the weak acid washing tank 304, and a strong acid detection module 404 and a strong acid circulation system 403 are installed inside the strong acid washing tank 306, which are used to detect the acidity and pH value of the sewage inside the pickling tank. When the detected acid concentration and pH value do not meet the pickling conditions, the weak acid circulation system 402 and the strong acid circulation system 403 can be interlocked and started respectively, and the recycled water is extracted from the reuse tank 308 and transported to the weak acid washing tank 304 and the strong acid washing tank 306 through the compensation waterway 320 to ensure that the acid concentration and pH value in the pickling tank meet the pickling requirements.

[0034] The compensation waterway 320 is a water pipe structure with three openings, which are respectively connected to the weak pickling tank 304, the strong pickling tank 306 and the reuse tank 308. When the pH value and pH value of the sewage in the pickling tank do not meet the pickling conditions, the weak acid circulation system 402 and the strong acid circulation system 403 control the recycled water to be transported to the pickling tank through the compensation waterway 320 to ensure that the acid concentration and pH value in the pickling tank meet the working requirements.

[0035] The slow flow plate 301 is a plate-like structure installed on the inner side wall of the filter tank 302. The slow flow plate 301 has an angle with the horizontal plane. This structure can buffer sewage when it falls into the filter tank 302, avoiding continuous impact of sewage on the filter box 303.

[0036] The reactor 10 has a columnar structure at the bottom and a hemispherical structure at the top. The reactor 10 has a grid-like cavity inside, which can make the reaction process in the reactor 10 more complete. The reactor 10 is equipped with an adsorption filler 105 and a liquid level gauge 106. The liquid level gauge 106 is used to monitor and protect the liquid level of the reactor 10 so that the liquid level in the reactor 10 is not too high or too low. The adsorption material 105 is PAT-MNPs, which is prepared by using Fe3O4@SiO2 as a magnetic core, modifying MNPs with a silane coupling agent or polyvinyl pyrrolidone, and polymerizing AT and coating MNPs under the action of CuCl2.

[0037] The wastewater adsorbed by the reactor 10 enters the filter tank 302, and the filter box 303 will filter out the particulate impurities in the wastewater. Then the wastewater enters the weak acid washing tank 304 through the one-way membrane 310, and the non-mercury ions washed out by the weak acid will be enriched in the non-mercury ion enrichment tank 305. The remaining part of the wastewater continues to enter the strong acid washing tank 306 through the one-way membrane, and the mercury ions washed out by the acid will be enriched in the mercury ion enrichment tank 307. The remaining wastewater will enter the reuse tank 308 and become recycled water for recycling.

[0038] A suction port 101 and a discharge port 103 are installed on the outside of the reactor 10. After sedimentation, isolation and flotation, the sewage enters the reactor 10 equipped with adsorption filler 105 through the suction port 101 and the suction control valve 102, and is then discharged into the filter tank 302 through the discharge port 103 and the discharge control valve 104 for further filtration. The suction port 101 is equipped with a suction control valve 102, and the discharge port 103 is provided with a discharge control valve 104, which are used to control the flow rate of the sewage.

[0039] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the utility model, and are not intended to limit the implementation methods of the technology of the utility model in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the utility model, but they should still be regarded as technologies or embodiments that are essentially the same as the utility model.

[0040] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A device for adsorbing and removing heavy metal mercury ions in sewage, comprising a tank body and a reactor (10), wherein a water inlet pipe (20) inserted into a filter tank (302) inside the tank body is provided between the tank body and the reactor (10), Features: A slow flow plate (301) is arranged on the inner wall of the filter pool (302); one side of the filter pool (302) is provided with a weak acid washing pool (304), a strong acid washing pool (306) and a reuse pool (308) which are arranged in the tank body and are interconnected; and a compensation waterway (320) is arranged at the top of the weak acid washing pool (304), the strong acid washing pool (306) and the reuse pool (308); The trough body is a structure with an opening at one end and a spaced cavity inside, a cover plate is provided at the open end of the trough body, and a peephole (309) is provided on the cover plate; One end of the water inlet pipe (20) inserted into the tank body is provided with a sewage flow retarder (201) and a sewage diverting flow splitter (202); the sewage flow retarder (201) is installed inside the end of the water inlet pipe (20) away from the reactor (10); the sewage flow retarder (201) is a pipe sleeve-like structure with through holes at both ends that tapers toward one side; a circular disc structure with four sides higher than the center is connected below the pipe sleeve-like structure; a gap is provided between the circular disc structure and the pipe sleeve-like structure; The compensation water circuit (320) is a tubular structure having three openings, wherein the three openings are respectively connected to the weak acid washing tank (304), the strong acid washing tank (306) and the reuse tank (308). The compensation water circuit (320) is controlled by the weak acid circulation system (402) and the strong acid circulation system (403).

2. A device for adsorbing and removing heavy metal mercury ions in sewage according to claim 1, characterized in that: The sewage diverter diverter (202) is a sleeve-like structure having a through hole at the top and through holes surrounding the side wall; an annular hole is provided at the bottom of the sewage diverter diverter (202); the sewage diverter diverter (202) is spirally mounted on the water inlet pipe (20).

3. A device for adsorbing and removing heavy metal mercury ions in sewage according to claim 1, characterized in that: The filtration tank (302), the weak acid washing tank (304), the strong acid washing tank (306) and the reuse tank (308) are separated by a one-way membrane (310).

4. A device for adsorbing and removing heavy metal mercury ions in sewage according to claim 1, characterized in that: The slow flow plate (301) is a plate-shaped structure installed on the inner side wall of the filter tank (302), and the slow flow plate (301) has an angle with the horizontal plane.

5. A device for adsorbing and removing heavy metal mercury ions in sewage according to claim 1, characterized in that: The lower part of the reactor (10) is a columnar structure and the upper part is a hemispherical structure. The interior of the reactor (10) has a grid-shaped cavity. The interior of the reactor (10) is equipped with an adsorption filler (105) and a liquid level meter (106).

6. A device for adsorbing and removing heavy metal mercury ions in sewage according to claim 5, characterized in that: The outside of the reaction kettle (10) is provided with a suction port (101) and a discharge port (103); the suction port (101) is provided with a suction control valve (102); and the discharge port (103) is provided with a discharge control valve (104).

7. A device for adsorbing and removing heavy metal mercury ions in sewage according to claim 1, characterized in that: The water inlet pipe (20) is connected to the discharge outlet (103).

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