Treatment equipment and treatment method for oil-containing heavy metal industrial wastewater

Abstract

The application relates to a treatment device and a treatment method for oil-containing heavy metal industrial wastewater. The treatment device comprises a separation tank, an aeration pipeline arranged in the separation tank and located in an emulsification area, a plurality of low-temperature separation rollers arranged on the separation tank at intervals along the liquid flow direction in the separation tank, and a recovery member arranged on the separation tank. The aeration pipeline is configured to separate oil liquid in the emulsification separation tank. The low-temperature separation rollers are located in the emulsification area. One recovery member is arranged at each low-temperature separation roller. One side wall of the recovery member abuts against the low-temperature separation roller. The low-temperature separation rollers are located behind the aeration pipeline along the liquid flow direction in the separation tank. The treatment device and the treatment method for the oil-containing heavy metal industrial wastewater disclosed by the application separate oil liquid through an active emulsification mode and a low-temperature separation mode, and then separately treat the micro metal chips and the heavy metal ions. The method has low consumption and is not prone to secondary pollution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial wastewater, in particular to a treatment device and method for oil-containing heavy metal industrial wastewater. BACKGROUND

[0002] The oil-containing heavy metal industrial wastewater needs to consider the mixed treatment of micro metal chips, oil and heavy metal ions. The difficulty of treating such wastewater lies in that the oil adheres to the metal chips or the mixture of oil and metal chips is suspended in the wastewater.

[0003] The difficulty of such treatment method lies in that the oil has strong blocking property. For example, using activated carbon adsorption, resin adsorption and membrane adsorption means for treatment, the oil will quickly block the medium (activated carbon, resin, membrane), causing low adsorption efficiency of the medium and difficulty in regeneration. If coagulation is used for treatment, mixed precipitates of micro metal chips, oil and heavy metal ions are obtained, which are difficult to treat, and the treatment process consumes additional chemical reagents and easily causes secondary pollution. SUMMARY

[0004] The present application provides a treatment device and method for oil-containing heavy metal industrial wastewater. The oil is separated out by active emulsification and low-temperature separation, and then the micro metal chips and heavy metal ions are treated separately. This method consumes less and is less likely to cause secondary pollution.

[0005] The above object of the present application is achieved by the following technical solution:

[0006] In a first aspect, the present application provides a treatment device for oil-containing heavy metal industrial wastewater, comprising:

[0007] A separation tank comprising a static separation zone and an emulsification zone arranged in sequence;

[0008] An aeration pipeline arranged in the separation tank and located in the emulsification zone, the aeration pipeline being configured to emulsify the oil in the separation tank;

[0009] A plurality of low-temperature separation rollers arranged at intervals on the separation tank along the liquid flow direction in the separation tank, the low-temperature separation rollers being located in the emulsification zone;

[0010] A recovery member arranged on the separation tank, one recovery member being arranged at each low-temperature separation roller, and one side wall of the recovery member abutting against the low-temperature separation roller;

[0011] In the liquid flow direction in the separation tank, the low-temperature separation rollers are located behind the aeration pipeline.

[0012] In a possible implementation manner of the first aspect, the treatment device further comprises:

[0013] A partition plate is arranged in the separation tank, and the partition plate is located below the low-temperature separation roller and the aeration pipeline.

[0014] A circulation pipeline has a first end connected to the static separation zone and a second end connected to the emulsification zone.

[0015] In a possible implementation manner of the first aspect, the first end of the circulation pipeline is located close to the low-temperature separation roller, and the second end of the circulation pipeline is located at the top end of the emulsification zone.

[0016] In a possible implementation manner of the first aspect, the low-temperature separation roller comprises:

[0017] A rotating shaft is rotationally connected to the separation tank.

[0018] A roller is arranged on the rotating shaft, and a gap exists between the roller and the rotating shaft.

[0019] A low-temperature assembly and a high-temperature assembly are arranged on the separation tank, and working portions of the low-temperature assembly and the high-temperature assembly are located in the gap and abut against the inner wall of the roller.

[0020] In the rotating direction of the roller, the low-temperature assembly is located in front of the high-temperature assembly.

[0021] In a possible implementation manner of the first aspect, the recovery member comprises:

[0022] A recovery tank is arranged on the separation tank.

[0023] A scraper is arranged on the recovery tank and abuts against the outer wall of the roller.

[0024] In the rotating direction of the roller, the scraper is located behind the high-temperature assembly.

[0025] In a possible implementation manner of the first aspect, the method further comprises:

[0026] A medicament plate is arranged in the separation tank, and the medicament plate is located between the low-temperature separation roller and the aeration pipeline.

[0027] A medicament cavity is arranged in the medicament plate.

[0028] Medicament holes are uniformly distributed on the surface of the medicament plate facing the low-temperature separation roller.

[0029] In a possible implementation manner of the first aspect, the medicament plate is arc-shaped, and the medicament plate is curved toward the side facing the low-temperature separation roller.

[0030] In a possible implementation manner of the first aspect, the distance between the low-temperature separation roller and the medicament plate is adjustable.

[0031] In a possible implementation manner of the first aspect, the low-temperature separation roller comprises:

[0032] The lifting device is arranged on the separation tank.

[0033] The rotating shaft is rotatably connected with the lifting device.

[0034] The drum is arranged on the rotating shaft, and a gap exists between the drum and the rotating shaft.

[0035] The low-temperature assembly and the high-temperature assembly are both arranged on the lifting device, and the working part of the low-temperature assembly and the working part of the high-temperature assembly are both located in the gap and abut against the inner wall of the drum.

[0036] In the rotating direction of the drum, the low-temperature assembly is located in front of the high-temperature assembly.

[0037] In a second aspect, the application provides a method for treating oil-containing heavy metal industrial wastewater, comprising:

[0038] The industrial wastewater is subjected to bubbling to fully emulsify the oil liquid in the industrial wastewater.

[0039] The low-temperature separation drum is used to contact with the industrial wastewater, so that the emulsified oil liquid is condensed on the outer wall of the low-temperature separation drum.

[0040] The oil liquid condensed on the low-temperature separation drum is recovered. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of a treatment device provided by the application, viewed from the top.

[0042] Figure 2 is a schematic diagram of the area division of the space in a separation tank.

[0043] Figure 3 is a structural schematic diagram of a treatment device provided by the application.

[0044] Figure 4 is a structural schematic diagram of a low-temperature separation drum provided by the application.

[0045] Figure 5 is a schematic diagram of the relative positions of a low-temperature assembly, a high-temperature assembly and a recovery member provided by the application.

[0046] Figure 6 is a schematic diagram of the positions of a partition plate and a circulating pipeline provided by the application.

[0047] Figure 7 is a schematic diagram of the internal structure of a medicament plate provided by the application.

[0048] Figure 8 is a structural schematic diagram of another low-temperature separation drum provided by the application.

[0049] In the figure, 1 is a separation tank, 2 is an aeration pipeline, 3 is a low-temperature separation roller, 4 is a recovery part, 11 is a static separation area, 12 is an emulsification area, 31 is a rotating shaft, 32 is a roller, 33 is a low-temperature component, 34 is a high-temperature component, 35 is a lifter, 41 is a recovery tank, 42 is a scraper, 51 is a partition plate, 52 is a circulation pipeline, 61 is a reagent plate, 62 is a reagent cavity, and 63 is a reagent hole. DETAILED DESCRIPTION

[0050] The technical solutions in the application will be further described in detail below with reference to the accompanying drawings.

[0051] The application discloses a treatment device for oil-containing heavy metal industrial wastewater. In some examples, please refer to Figure 1 The treatment device for oil-containing heavy metal industrial wastewater disclosed by the application comprises a separation tank 1, an aeration pipeline 2, a low-temperature separation roller 3, and a recovery part 4. The space in the separation tank 1 is divided into two parts, which are a static separation area 11 and an emulsification area 12, as shown in Figure 2 The arrow in the figure indicates the flow direction of the wastewater. The static separation area 11 is used to preliminarily precipitate the oil-containing heavy metal industrial wastewater (hereinafter referred to as wastewater) so that part of the metal chips in the wastewater can form a precipitate.

[0052] It should be noted that the precipitation in the static separation area 11 is only gravity precipitation.

[0053] The aeration pipeline 2 is arranged in the separation tank 1 and located in the emulsification area 12. The aeration pipeline 2 is used to emulsify the oil liquid in the separation tank 1, mainly the oil liquid in the emulsification area 12. The emulsification is performed with the help of a large number of bubbles generated by the aeration pipeline 2. The emulsification can make the oil liquid in the wastewater form oil liquid particles and then uniformly distribute in the wastewater.

[0054] The active emulsification has the following effects:

[0055] 1. The oil liquid is separated from the metal chips to form oil liquid particles. At this time, part of the metal chips will form a precipitate.

[0056] 2. The oil liquid particles are concentrated and distributed on the surface layer of the wastewater.

[0057] 3. The oil liquid particles are uniformly distributed, which facilitates the recovery and improves the energy efficiency ratio of the recovery.

[0058] A plurality of low-temperature separation rollers 3 are arranged on the separation tank 1 along the flow direction of the liquid in the separation tank 1. The low-temperature separation roller 3 is located in the emulsification area 12 and behind the aeration pipeline 2 in the flow direction of the liquid in the separation tank 1.

[0059] The low-temperature separation roller 3 is used to recover the oil particles as described above. The recovery process is as follows: the low-temperature separation roller 3 is in contact with the oil particles, and the oil particles are frozen on the surface of the low-temperature separation roller 3. During the rotation of the low-temperature separation roller 3, the surface temperature of the low-temperature separation roller 3 rises, and the connection between the frozen oil particles and the low-temperature separation roller 3 is weakened, and finally the frozen oil particles are recovered by the recovery member 4.

[0060] The recovery member 4 is arranged on the separation tank 1, and one recovery member 4 is arranged at each low-temperature separation roller 3. One side wall of the recovery member 4 abuts against the low-temperature separation roller 3, and is used to recover the oil particles on the low-temperature separation roller 3.

[0061] In some examples, referring to Figure 3 , a partition plate 51 and a circulation pipeline 52 are added. The partition plate 51 is arranged in the separation tank 1 and is located below the low-temperature separation roller 3 and the aeration pipeline 2. The first end of the circulation pipeline 52 is connected to the static separation zone 11, and the second end is connected to the emulsification zone 12.

[0062] The flow direction of the wastewater in the circulation pipeline 52 is indicated by the arrows in Figure 3 .

[0063] The partition plate 51 is used to limit the influence range of the circulation pipeline 52. The wastewater above the partition plate 51 is not affected by the circulation pipeline 52, and the wastewater below the partition plate 51 is returned to the static separation zone 11 for further treatment, so as to further reduce the amount of oil in the wastewater and meet the standard for entering the next treatment process.

[0064] In some possible implementations, the first end of the circulation pipeline 52 is located near the last low-temperature separation roller 3, and the second end of the circulation pipeline 52 is located at the top end of the emulsification zone 12.

[0065] In some examples, referring to Figure 4 and Figure 5 , the low-temperature separation roller 3 includes a rotating shaft 31, a roller 32, a low-temperature assembly 33, and a high-temperature assembly 34. The rotating shaft 31 is rotationally connected to the separation tank 1. The roller 32 is fixed to the rotating shaft 31, and a gap exists between the roller 32 and the rotating shaft 31.

[0066] In some possible implementations, the rotating shaft 31 is driven by a motor (not shown).

[0067] The low-temperature assembly 33 and the high-temperature assembly 34 are both fixedly installed on the separation tank 1. The working parts of the two assemblies are located in the gap and abut against the inner wall of the roller 32.

[0068] In some possible implementations, both the low-temperature assembly 33 and the high-temperature assembly 34 use copper pipes and medium sources matched with the copper pipes. The medium source of the low-temperature assembly 33 refers to a refrigerator, which is composed of a compressor, a compressor, a condenser, a throttling device and an evaporator, and the medium flowing in the copper pipe of the low-temperature assembly 33 plays a role of cooling; the medium source of the high-temperature assembly 34 refers to a boiler, which is mainly composed of a heater and a circulating pump, and the medium flowing in the copper pipe of the high-temperature assembly 34 plays a role of heating.

[0069] Of course, the high-temperature assembly 34 can also directly use an electric heater.

[0070] In the rotation direction of the drum 32, the low-temperature assembly 33 is located in front of the high-temperature assembly 34, that is, for the treatment of oil particle, the way of cooling first and then heating is adopted.

[0071] In some examples, referring to Figure 5 , the recovery member 4 includes a recovery pool 41 and a scraper 42. The recovery pool 41 is installed on the separation pool 1, and the scraper 42 is fixed on the recovery pool 41 and abuts against the outer wall of the drum 32. The scraper 42 plays a role of hanging and removing the oil particles adhering to the outer wall of the drum 32, and the oil particles will slide into the recovery pool 41 for centralized treatment.

[0072] In the rotation direction of the drum 32, the scraper 42 is located behind the high-temperature assembly 34.

[0073] In some examples, referring to Figure 6 , a medicament plate 61 is further added. The medicament plate 61 is located in the separation pool 1 and between the low-temperature separation drum 3 and the aeration pipeline 2, and plays a role of spraying medicament to the aggregation area of the oil particles, so that the oil particles can be aggregated to a certain extent.

[0074] The medicament plate 61 has a medicament cavity 62 inside, and medicament holes 63 are uniformly distributed on the surface of the medicament plate 61 facing the low-temperature separation drum 3. When the wastewater passes through the medicament plate 61, the wastewater will contact the medicament sprayed from the medicament holes 63.

[0075] In some possible implementations, the sprayed medicament is a demulsifier.

[0076] In some possible implementations, the demulsifier is sent into the medicament cavity 62 through a quantitative pump and a pipeline.

[0077] In some possible implementations, the spraying mode of the medicament is intermittent spraying.

[0078] In some possible implementations, the distance between the low-temperature separation drum 3 and the medicament plate 61 is adjustable, and the medicament plate 61 is driven by an electric cylinder to perform linear reciprocating motion in the vertical direction.

[0079] In some possible implementations, the medicament plate 61 is arc-shaped, and the medicament plate 61 is curved towards the side of the low-temperature separation roller 3, so as to intercept oil particles with a large volume and avoid the oil particles from falling on the bottom of the separation tank 1.

[0080] When the medicament plate 61 is movable, the rotating shaft 31, the roller 32, the low-temperature assembly 33 and the high-temperature assembly 34 all need to be transferred to the lifter 35. In this way, the coverage of the low-temperature separation roller 3 can be expanded, and the recovery rate of oil particles can be improved.

[0081] The application further provides a treatment method of oil-containing heavy metal industrial wastewater, and the method comprises the following steps:

[0082] The industrial wastewater is subjected to bubbling, so that oil in the industrial wastewater is fully emulsified;

[0083] The low-temperature separation roller 3 is used to contact the industrial wastewater, so that the emulsified oil is condensed on the outer wall of the low-temperature separation roller 3;

[0084] The oil condensed on the low-temperature separation roller 3 is recovered.

[0085] The embodiments of the specific implementation are the preferred embodiments of the application, and do not limit the protection scope of the application. Therefore, equivalent changes made according to the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. An apparatus for treating oil-containing heavy metal industrial wastewater, characterized by comprising: The application relates to a treatment device for oil-containing heavy metal industrial wastewater. The treatment device comprises a separation tank (1) which comprises a static separation zone (11) and an emulsification zone (12) arranged in sequence; an aeration pipeline (2) arranged in the separation tank (1) and located in the emulsification zone (12), the aeration pipeline (2) being configured to emulsify oil liquid in the separation tank (1); a plurality of low-temperature separation rollers (3) arranged on the separation tank (1) at intervals along the flow direction of liquid in the separation tank (1), the low-temperature separation rollers (3) being located in the emulsification zone (12); and a recovery member (4) arranged on the separation tank (1), one recovery member (4) being arranged at each low-temperature separation roller (3), and one side wall of the recovery member (4) abutting against the low-temperature separation roller (3). The liquid in the separation tank (1) flows in the direction of the arrow, and the low-temperature separation roller (3) is located behind the aeration pipeline (2). The low-temperature separation roller (3) comprises a lifter (35) arranged on the separation tank (1); a rotating shaft (31) rotationally connected with the lifter (35); a roller (32) arranged on the rotating shaft (31) and having a gap with the rotating shaft (31); and a low-temperature assembly (33) and a high-temperature assembly (34) both arranged on the lifter (35), the working part of the low-temperature assembly (33) and the working part of the high-temperature assembly (34) being located in the gap and abutting against the inner wall of the roller (32). The low-temperature assembly (33) is located in front of the high-temperature assembly (34) in the rotating direction of the roller (32). The treatment device further comprises a partition plate (51) arranged in the separation tank (1) and located below the low-temperature separation roller (3); and a circulating pipeline (52) having a first end connected with the static separation zone (11) and a second end connected with the emulsification zone (12). The first end of the circulating pipeline (52) is located close to the low-temperature separation roller (3), and the second end of the circulating pipeline (52) is located at the top end of the emulsification zone (12). The recovery member (4) comprises a recovery tank (41) arranged on the separation tank (1); and a scraper (42) arranged on the recovery tank (41) and abutting against the outer wall of the roller (32). The scraper (42) is located behind the high-temperature assembly (34) in the rotating direction of the roller (32). The treatment device further comprises a medicament plate (61) arranged in the separation tank (1) and located between the low-temperature separation roller (3) and the aeration pipeline (2); a medicament cavity (62) arranged in the medicament plate (61); and a plurality of medicament holes (63) uniformly distributed on the surface of the medicament plate (61) facing the low-temperature separation roller (3). The medicament plate (61) is arc-shaped and curved towards the low-temperature separation roller (3). The distance between the low-temperature separation roller (3) and the medicament plate (61) is adjustable.

2. The oil-containing heavy metal industrial wastewater treatment apparatus according to claim 1, characterized by The treatment device for oil-containing heavy metal industrial wastewater is applied to the following treatment process: the industrial wastewater is bubbled to sufficiently emulsify oil liquid in the industrial wastewater; the low-temperature separation roller (3) is used to contact with the industrial wastewater to make the emulsified oil liquid condense on the outer wall of the low-temperature separation roller (3); and the oil liquid condensed on the low-temperature separation roller (3) is recovered. ​ ​ 3. The oil-containing heavy metal industrial wastewater treatment apparatus according to claim 2, characterized by ​ 4. The oil-containing heavy metal industrial wastewater treatment apparatus according to claim 1, characterized by ​ ​ ​ ​ 5. The oil-containing heavy metal industrial wastewater treatment apparatus according to claim 1, characterized by ​ ​ ​ ​ 6. The oil-containing heavy metal industrial wastewater treatment apparatus according to claim 5, characterized by ​ 7. The oily heavy metal industrial wastewater treatment apparatus according to claim 1 or 5 or 6, characterized by, ​ 8. A method for treating oil-containing heavy metal industrial wastewater, characterized by, ​ ​ ​ ​

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