Device for removing heavy metal ions in paddy field soil

Abstract

The utility model relates to a device for removing heavy metal ions in paddy field soil. The device is characterized by comprising a double-layer tubular frame, an end cover and a gauze element, the circumference of the tubular frame on the inner layer is wrapped with a gauze element, the gauze element and the space of the end covers on the two sides form an enrichment area, and the enrichment area is filled with filler fixed with a heavy metal ion chelating agent; the periphery of the tubular frame on the outer layer is wrapped with a gauze element, and the tubular frame, the end covers on the two sides and the enrichment area form an annular adsorption area, and the adsorption area is filled with adsorption filler; a power supply is arranged on one end cover, a penetrating electrode is arranged in the axis direction of the enrichment area, and the electrode is connected with a negative electrode of the power supply; the end covers on the two sides are jointly connected with a vibration device through springs. According to the device, a tubular frame structure is adopted to form an enrichment area and an adsorption area, meanwhile, a vibration motor is arranged, the whole device is driven to axially vibrate in a low-frequency and small-amplitude mode, and therefore efficient remediation and harmless treatment of heavy metal pollution are achieved, the adsorption effect is good, and secondary pollution cannot be caused.

Description

TECHNICAL FIELD

[0001] The utility model relates to a device for heavy metal ion removal in paddy field soil belongs to the technical field of paddy field management equipment. BACKGROUND

[0002] Heavy metal pollution can cause abnormal composition of paddy field, reduce rice yield, and heavy metals can also be enriched in human body through the consumption of rice, eventually causing serious harm to human health and the entire ecological environment.

[0003] Among many heavy metal pollution remediation methods for paddy fields, the most commonly used is chelation leaching, that is, through chelation of heavy metals in paddy fields by leaching agent, and then recycling. The commonly used leaching agent for leaching is ethylenediaminetetraacetic acid (EDTA) and diethylenetriamine pentaacetic acid (DTPA), both of which are dissolved in water as medium and chelate with free heavy metal ions in paddy fields, so that they are solidified or collected and separated with leaching liquid and then treated. However, these two leaching agents have certain toxicity and weak degradation ability, which can easily cause potential harm to the ecology of paddy fields; at the same time, due to the lack of specificity of heavy metal ion chelation and no supporting heavy metal recovery technology, it is impossible to realize harmless treatment of heavy metal ions, which may cause secondary pollution. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a device for heavy metal ion removal in paddy field soil, which adopts a tubular frame structure to form an enrichment zone and an adsorption zone, and is provided with a vibration motor, which drives the entire device to vibrate axially at a low frequency and small amplitude, so as to realize efficient remediation and harmless treatment of heavy metal pollution, has good adsorption effect, and will not cause secondary pollution.

[0005] To solve the above problems, the specific technical scheme of the utility model is as follows: a device for heavy metal ion removal in paddy field soil, comprising a double-layer tubular frame, end covers and gauze; the inner tubular frame is wrapped with gauze and forms an enrichment zone with the space of the two end covers, and the enrichment zone is filled with a filler fixed with a heavy metal ion chelating agent; the outer tubular frame is wrapped with gauze and forms an annular adsorption zone with the two end covers and the enrichment zone outside, and the adsorption zone is provided with adsorption filler; one of the end covers is provided with a power supply, and an electrode is provided in the axial direction of the enrichment zone and penetrates through the end cover; the electrodes are connected with the negative electrode of the power supply; the two end covers are connected with a vibration device through springs.

[0006] The vibration device comprises a vibrator and a fixed frame; the number of fixed frames is four, which are distributed in a cross shape along the outer periphery of the tubular frame, one end of each fixed frame is connected with the end cover through the outer surface through a rubber spring, and the other end is connected with a fixed disc; the outer end surface of the fixed disc is provided with a vibrator, and the vibration wave formed by the vibrator is conducted through the other end cover and drives the tubular frame to vibrate axially.

[0007] The fixed frame has a guide groove along the length direction, and a plurality of balls are arranged in the guide groove.

[0008] A metal ion concentration detector is arranged on one side end cover, and a sensing part of the metal ion concentration detector is inserted into the enrichment area.

[0009] The double-layer tubular frame is supported and positioned by the cross-distributed supports.

[0010] The adsorption filler in the adsorption area is macroporous adsorption resin particles and membrane material matrix.

[0011] The heavy metal contaminated soil remediation equipment of the present application adopts the above structure and has the following advantages:

[0012] 1. The device of the present application is buried in the paddy field to be repaired, and the separation of heavy metals and the soil environment is realized through the enrichment area and the adsorption area, and at the same time, the small amplitude vibration is expanded to enlarge the capillary flux and improve the moving efficiency, so as to achieve the purpose of efficient remediation and harmless treatment of heavy metal pollution;

[0013] 2. The vibration device adopts a motor, a fixed frame and a spring structure to drive the tubular frame to vibrate, loosen the soil and improve the adsorption efficiency;

[0014] 3. The fixed frame is provided with balls to improve the support of the tubular frame and ensure smooth vibration;

[0015] 4. The middle part is connected with the negative electrode of the power supply to increase the ion recruitment efficiency, and the side end is provided with a metal ion concentration detector to monitor the ion concentration change in the device in real time. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view of the present application.

[0017] Figure 2 It is a front view of the present application. Figure 1

[0018] Figure 3 It is an internal structure diagram of the present application.

[0019] Figure 4 It is a partial enlarged view of the present application. Figure 3 DETAILED DESCRIPTION

[0020] As Figures 1 to 4 ​​As shown, a device for removing heavy metal ions in paddy soil, comprising a double-layer tubular frame 2, end cap 1 and gauze 3, the double-layer tubular frame 2 is supported and positioned by cross-distributed support 8; the inner tubular frame 2 is wrapped with gauze 3 and forms an enrichment zone with the space of the two side end caps 1, the enrichment zone is filled with a heavy metal ion chelating agent; the outer tubular frame 2 is wrapped with gauze 3 and forms an annular adsorption zone with the two side end caps 1 and the enrichment zone, the adsorption zone is filled with adsorption filler, the adsorption filler is macroporous adsorption resin particles and membrane material matrix; one of the end caps 1 is provided with a power supply 9, and an electrode 5 is provided in the axial direction of the enrichment zone, the electrode 5 is connected with the negative electrode of the power supply 9, and a conductive silver-plated protective sleeve 12 is arranged outside the electrode; the two side end caps 1 are connected by a spring 13.

[0021] The vibration device comprises a fixed frame 10, a fixed disc and a vibrator 16; the fixed frame 10 is cross-distributed along the outer periphery of the tubular frame 2, one end of each fixed frame 10 is connected with the end cap 1 through the outer surface by a rubber spring 13, and the other end is connected with the fixed disc 15; the outer end surface of the fixed disc 15 is provided with the vibrator 16, and the vibration wave formed by the vibrator 16 is conducted through the other end cap 1 and drives the tubular frame 2 to form axial vibration.

[0022] The fixed frame 10 has a guide groove 14 in the length direction, and a plurality of ball bearings 17 are arranged in the guide groove 14; a sliding groove is arranged at the corresponding position of the outer tubular frame 2, and the upper part of the ball bearing 17 is in rolling cooperation with the sliding groove.

[0023] A metal ion concentration detector 11 is arranged on one side of the end cap 1, and the sensing part of the metal ion concentration detector is inserted into the enrichment zone.

[0024] The working process of the device for removing heavy metal ions in paddy soil is as follows:

[0025] 1) Select a paddy field that needs to be repaired for heavy metal pollution, determine the number of ridges according to the planting plan;

[0026] 2) At the ridge between each field ridge for drainage, dig a certain depth of ditch downward, the depth is 10-15 cm higher than the device, put the heavy metal pollution paddy field repair device into the pit, backfill the soil around to the upper surface and cover to the ridge surface, the vibrators and ion concentration detectors at both ends of the device are required to be exposed to the outside to ensure operation and real-time monitoring, and the ridge structure is reserved to facilitate farmland drainage;

[0027] 3) During the normal irrigation and fertilization of crop growth, the free heavy metal ions in the farmland soil are dissolved by water and gathered in the ridge part, and then enter the device through the gauze along with the water flow under the process of sedimentation and capillary action, while the device vibration system vibrates at a certain frequency to improve the degree of capillary action;

[0028] 4) The macroporous adsorption resin particles and membrane material matrix in the adsorption zone are used to remove impurities or bacteria moving along with the heavy metal ions, to ensure the purity of the heavy metal ions entering the enrichment zone, so as to protect the heavy metal ion chelating agent and its fixed matrix in the enrichment zone, and to maintain the normal operation of the device; The enrichment zone is filled with matrix with heavy metal ion chelating agent anchored on the surface, such as organic polymer membrane and resin particles. As the heavy metal ions are attracted and gathered by the electrode with negative potential in the center of the device, the heavy metal ion chelating agent on the surface of the matrix will chelate with the heavy metal ions, so that the heavy metal ions are separated from the soil and water and fixed on the matrix, realizing heavy metal enrichment and reducing the content of heavy metal in the paddy field;

[0029] 5) After a period of time, the device is taken out, the fillers in the enrichment zone are removed, and the fillers in the enrichment zone are leached with an acidic leaching agent. After the heavy metal ions are separated from the chelating agent, they can be recycled. After the heavy metal ion chelating agent is separated from the heavy metal ions, it is still anchored on the surface of the matrix such as organic polymer membrane and resin particles, and can be filled into the enrichment zone again with the matrix for repeated use. The filling materials in the adsorption zone can be used continuously and can be replaced after the device is used for 5-10 times.

Claims

1. A device for removing heavy metal ions from paddy field soil, characterized in that: The application relates to a double-layer tubular frame (2), end caps (1) and gauze (3) which are combined; the inner-layer tubular frame (2) is wrapped around the gauze (3) and forms a rich area (7) with the space of the two end caps (1), the rich area is filled with a filler which is fixed with heavy metal ion chelating agents; the outer-layer tubular frame (2) is wrapped around the gauze (3) and forms a ring-shaped adsorption area (6) with the two end caps (1) and the rich area, the adsorption area is filled with adsorption fillers; a power supply (9) is arranged on one of the end caps (1), an electrode (5) is arranged in the axial direction of the rich area, and the electrode (5) is connected with the negative electrode of the power supply (9); the two end caps (1) are connected with a vibration device through springs (13).

2. The device for removing heavy metal ions in paddy field soil according to claim 1, characterized in that: The vibration device comprises a vibrator (16) and a fixing frame (10); the fixing frame (10) is cross-distributed along the outer periphery of the tubular frame (2), one end of each fixing frame (10) is connected with the end cap (1) through the outer surface through a rubber spring (13), and the other end is connected with a fixing disc (15); the outer end surface of the fixing disc (15) is provided with the vibrator (16), the vibration wave formed by the vibrator (16) is conducted through the other end cap (1) and drives the tubular frame (2) to form axial vibration.

3. The device for removing heavy metal ions from paddy field soil according to claim 2, characterized by: The fixing frame (10) is provided with a guide groove (14) along the length direction, and a plurality of ball bearings (17) are arranged in the guide groove (14).

4. The device for removing heavy metal ions in paddy field soil according to claim 1, characterized in that: A metal ion concentration detector (11) is arranged on one end cap (1), and the sensing part of the metal ion concentration detector (11) is inserted into the rich area.

5. The device for removing heavy metal ions in paddy field soil according to claim 1, characterized in that: The double-layer tubular frames (2) are supported and positioned by cross-distributed supports (8).

6. The device for removing heavy metal ions in paddy field soil according to claim 1, characterized in that: The adsorption fillers in the adsorption area are macroporous adsorption resin particles and membrane material matrix.

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