CN204799678U - Drip washing desorption soil pollutant's integrated device is mixed to dystopy - Google Patents

Abstract

The utility model provides an integrated device for removing soil pollutants by ectopic mixing and leaching, which belongs to the field of environmental technology and can be used to repair and treat soil with a clay particle content of less than 25% and polluted by heavy metals; it includes a drum screening machine (22), screw mixer (23), elevator (24), belt filter press (25) and control system. The technical scheme adopted by the utility model for treating polluted soil is: the polluted soil (26) is first sieved by a drum screening machine (22); mouth (13), while the high-pressure spray device (12) on the feed inlet (13) sprays the eluent (29); inside the screw mixer (23), polluted soil (26) and eluent (29) Fully mixed and washed; the washed soil (31) is lifted to a belt filter press (25) for pressure filtration to obtain treated clean soil (32).

Description

An integrated device for removing soil pollutants by ectopic mixing and leaching

technical field

The utility model belongs to the field of environmental technology, and relates to an integrated device for removing soil pollutants by ectopic mixing and leaching.

Background technique

In recent years, it has been found that the degree of soil pollution in my country is relatively serious and the scope of pollution is wide, and there is a trend of gradual expansion. Toxic pollutants in the soil enter the food chain, where typical pollutants are heavy metals. Heavy metals can be enriched through the food chain, and may also generate more toxic methyl compounds, poisoning food chain organisms, and eventually accumulate in the human body, seriously threatening human health. Therefore, the country attaches great importance to the pollution control of heavy metals.

Soil heavy metal pollution control methods are generally divided into two types. One is to change the existing state of heavy metals in the soil from an effective highly toxic active state to a low-toxic stable state. This kind of restoration method does not reduce the total amount of heavy metals in the soil, but it is The threat of heavy metals in the soil to ecology and human beings is greatly reduced; the other is to remove heavy metals from the soil. There are many such technical methods, but the cost is high and the practicability is limited. Both of the above two methods involve the process of mixing and rinsing, so effective mixing and rinsing equipment is very important for remediation and treatment of heavy metal pollution.

The utility model relates to an integrated device for removing soil pollutants by ectopic mixing and leaching, which can not only achieve good mixing of eluent and soil, but also integrate the ectopic leaching and removing of soil pollutants. The device has simple structure, low energy consumption, and efficiently controls pollutants in polluted soil.

Utility model content

Ectopic soil leaching is to select or prepare a suitable eluent to wash out the pollutants in the polluted soil, then treat the eluate containing pollutants, and backfill or transfer the clean soil.

The technical solution adopted by the utility model to solve the key technical problems is:

The utility model relates to an integrated device for removing soil pollutants by ectopic mixing and leaching, which is characterized in that it comprises a drum screening machine (22), a screw mixer (23), a hoist (24), a belt filter press Machine (25) and control system.

According to the process of polluted soil being repaired, the utility model relates to an integrated device for removing soil pollutants by ectopic mixing and leaching. The polluted soil is first screened by a drum screening machine (22), and then sequentially passed through a spiral mixer ( 23) mixed and rinsed, transported by the hoist (24), and finally enters the belt filter press (25) for pressure filtration and dehydration.

Among them, the spiral mixer (23) is the core of an integrated device for removing soil pollutants by ectopic mixing and leaching, and is composed of a motor (18), a reducer (19) and a screw mixer main body; the motor (18) It forms a reduction motor with the speed reducer (19), and the output end of the speed reducer (19) is connected with the main body of the screw mixer through a shaft coupling (20).

The main body of the spiral mixer is a box structure, which consists of a feed inlet (13), a high-pressure liquid spray device (12), a screw shaft (10) and blades (11), a spiral groove, a liquid collection tank (14), and a discharge port ( 7) Composition.

The spiral groove is composed of 3 independent single grooves side by side; the spiral groove wall is assembled from the spiral groove inner wall, the spiral groove outer wall, and the spiral groove longitudinal baffle (3) to form an interlayer, and the interlayer is filled with fine sand and gravel (6) to cover the spiral groove The cover plate (15) is assembled into a spiral groove; the inner wall of the spiral groove is drilled with fine holes (1) on the inner wall of the spiral groove, and the inner wall of the spiral groove is reserved for mud outlet (2), and the outer wall of the spiral groove is drilled with fine holes on the outer wall of the spiral groove (4) And set the mud outlet (5) reserved on the outer wall of the spiral groove, the mud outlet (2) reserved on the inner wall of the spiral groove and the mud outlet (5) reserved on the outer wall overlap to form the soil discharge port (7); on the outer wall of the spiral groove Arrange and install a back-blowing flushing device (17); install a screw shaft (10) in each single groove of the screw groove, and the diameter of the screw shaft (10) gradually increases from the head end to the end; the screw blade (11) is installed on the screw shaft The screw shaft (10) is installed with bearings and shaft seals (9) at both ends of the screw groove, and is connected with the reducer (19) through a shaft coupling (20).

The liquid collection box (14) is installed below the spiral groove, and the shape and size of the upper mouth of the liquid collection box (14) are consistent with the bottom surface of the spiral groove, and the water shutoff gate valve (16) is installed at the bottom of the liquid collection box (14).

The feed inlet (13) is installed on the upper part of the head end of the spiral groove, and the high-pressure liquid spraying device (12) is installed on the housing wall of the feed inlet (13).

The mud outlet (7) is arranged at the end of the spiral groove, and is connected with the mud outlet pipe (21) of the spiral mixer (23).

The polluted soil (26) is first sieved by a drum screening machine (22) to remove gravel and organic residues (27) with excessive particle sizes; the polluted soil (26) after screening is transported into the screw mixer (23) Feed inlet (13), while the high-pressure spray device (12) on the feed inlet (13) sprays the eluent (29); inside the screw mixer (23), polluted soil (26) and eluent ( 29) fully mixed, the pollutants are desorbed from the polluted soil (26) and enter the eluent (29), forming an eluent (30) rich in pollutants; the washed soil (31) is discharged from the mud outlet pipe (21) ) falls on the hoist (24), is promoted to the belt filter press (25), passes through the pressure filtration of the belt filter press (25), and obtains the clean soil (32) after the treatment.

From the eluent (30) rich in pollutants collected by the screw mixer (23) and the belt filter press (25), the heavy metal in the water is removed by the separation method of flocculation and sedimentation; the eluent after the separation of the heavy metal ( 29) Return to the screw mixer (23) for recycling.

The utility model can be used for repairing and controlling the soil with a soil clay particle content lower than 25% and polluted by heavy metals.

Description of drawings

Figure 1 is the inner wall of the spiral groove and the longitudinal baffle; Figure 2 is the connection and installation method of the inner wall of the three spiral grooves; Figure 3 is the outer wall of the spiral groove; Figure 4 is fine sand and gravel; Figure 5 is the spiral groove; Figure 6 is the spiral shaft; Figure 7 is the feed inlet; Figure 8 is the liquid collection tank; Figure 9 is the spiral groove cover; Figure 10 is the front section view of the screw mixer; Figure 11 is the top section of the screw mixer; Figure 12 is the main body of the screw mixer Figure; Figure 13 is a drum screening machine; Figure 14 is a process connection diagram of a spiral mixer and a supporting elevator and a filter press; Figure 15 is a flow chart of a specific embodiment.

In the figure: the fine hole on the inner wall of the spiral groove (1), the mud outlet reserved on the inner wall of the spiral groove (2), the horizontal baffle of the spiral groove (3), the fine hole on the outer wall of the spiral groove (4), the mud outlet reserved on the outer wall of the spiral groove (5), fine sand and gravel (6), mud outlet of screw mixer (7), desilter scraper (8), bearing and shaft seal device (9), screw shaft (10), screw blade (11) , high-pressure liquid spraying device (12), feed inlet (13), liquid collection tank (14), spiral groove cover plate (15), water cut-off gate valve (16), back-blowing flushing device (17), motor (18) , reducer (19), coupling (20), screw mixer mud outlet pipe (21), drum screening machine (22), screw mixer (23), hoist (24), belt filter press ( 25), polluted soil (26), oversized gravel, organic residues (27), sieved polluted soil (28), eluate (29), eluate rich in pollutants (30 ), washed soil (31), treated clean soil (32).

Detailed ways

The technological process of heterotopic soil mixed leaching is: excavation of contaminated soil→sieving of soil particles→mixed leaching treatment and solid-liquid separation→leach solution treatment→disposal of soil after leaching.

The utility model follows the above technical process, and the drum screening machine (22) is used to remove gravels and organic residues (27) with excessive particle sizes, so as not to damage the system equipment; the spiral mixer (23) and the belt filter press (25 ) for leaching treatment and solid-liquid separation of contaminated soil.

The spiral mixer (23) is the core of an integrated device for removing soil pollutants by ectopic mixing and leaching. Its motor (18) provides power and is connected with the reducer (19); the reducer (19) is used for reducing speed and increase the torque; the spiral mixer (23) is used to fully mix the polluted soil (26) and the prepared eluent (29), and the pollutants are desorbed from the soil and dissolved in the eluent (29); The contaminated soil (26) is mixed and washed by spiral agitation and pushing, and the eluent (30) rich in pollutants seeps into the liquid collection tank (14) from the gap between the gravels of the spiral mixer.

The specific implementation method is:

The polluted soil (26) is continuously put into the drum screening machine (22) through the feeding conveyor belt, and the gravel and organic residues (27) with too large particle size are screened out, and the polluted soil (28) after screening is passed through the feeding conveyor belt. The conveyor belt is fed into the screw mixer (23).

When the polluted soil (26) was dropped into the feed port (13) of the spiral mixer (23), the high-pressure spray device (12) of the feed port (13) sprinkled the eluent (29) onto the polluted soil ( 26), the contaminated soil (26) and eluent (29) are fully mixed in the mixing area of the screw mixer (23); at the feeding end of the contaminated soil (26), the diameter of the screw shaft is small, and the screw will pollute the soil (26) Fully mixed with the eluent (29), the pollutants are dissolved and leached by the eluent (29) in the polluted soil (26). As the diameter of the screw shaft (10) gradually increases, the eluent rich in pollutants (30) Seep from the fine sand and gravel (6) gaps between the spiral groove walls into the liquid collection tank (14), and the washed soil is scraped off by the desilter scraper (8) to the outlet of the rotary mixer. Mud port (7), then transported to the belt filter press (25) for pressure filtration through the elevator (24), and the belt filter press (25) will further remove the wet soil produced from the screw mixer (23). liquid treatment to obtain treated clean soil (32); the pollutant-rich eluent (30) after press filtration and the pollutant-rich eluent (30) extruded by the screw mixer (23) They are collectively collected in the pollution treatment pool, treated with a flocculant, and a qualified leaching pretreatment solution is obtained. The leaching pretreatment solution is formulated into a suitable leaching solution (29), and returned to the spiral mixer (23) for recycling.

The main function of the control system is to control the motor switch, emergency stop, belt deviation correction and tension; the hoist (24) is used for soil transmission during the restoration process, and lifts the soil discharged from the mud outlet pipe (21) of the screw mixer to the belt compactor. filter (25).

The eluent (29) used for eluting soil includes inorganic acid-base solution eluent, organic acid and its salt eluent, metal chelating agent, surfactant, composite eluent and water, etc. selection of contaminated soil.

Claims (1)

1. a dystopy mixes the integrated apparatus that drip washing removes soil pollutant, it is characterized in that, described device comprises: cylinder round sifter (22), mixing screw (23), elevator (24), belt filter press (25) and control system;

Mixing screw (23) is the core that a kind of dystopy mixing drip washing removes the integrated apparatus of soil pollutant, is made up of motor (18), reductor (19) and mixing screw main body; Motor (18) and reductor (19) form reducing motor, and reductor (19) output is connected by shaft coupling (20) with mixing screw main body;

Mixing screw main body is body structure, is made up of charging aperture (13), high pressure liquid spray device (12), helical axis (10) and blade (11), helicla flute, catch box (14), discharging opening (7);

Helicla flute is made up of side by side 3 separate single grooves; Spiral cell wall is assembled into interlayer by helicla flute inwall, helicla flute outer wall, helicla flute longitudinal baffle (3), loads fine sand and gravel (6) in interlayer, covers helicla flute cover plate (15) and is assembled into helicla flute; Helicla flute inwall is drilled with helicla flute inwall pore (1) and arranges helicla flute inwall reserves mud mouth (2), helicla flute outer wall is drilled with helicla flute outer wall pore (4) and arranges helicla flute outer wall reserves mud mouth (5), helicla flute inwall reserves mud mouth (2) and outer wall reserves mud mouth (5) overlap, forms earth discharging opening (7); Lay at helicla flute outer wall and blowback flusher (17) is installed; In each single groove of spiral fluted, install helical axis (10), helical axis (10) increases from head end gradually to end diameter; Helical axis is installed helical blade (11); Helical axis (10) installs bearing and gland seal device (9) at helicla flute two ends, is connected with reductor (19) by shaft coupling (20);

Catch box (14) is installed on below helicla flute, and catch box (14) shape suitable for reading is consistent with helicla flute bottom surface with size, and the gate valve (16) that intercepts water is installed in catch box (14) bottom;

Charging aperture (13) is installed on helicla flute head end top, installation high-voltage liquid-jet device (12) composition on the housing wall of charging aperture (13);

Earth discharging opening (7) is arranged on spiral groove end, connects mixing screw (23) sludge out pipe (21).