A process for desalination and alkali reduction of saline soil

Abstract

The present invention discloses a process for draining and reducing salt in alkali-affected saline soil, comprising the following steps: Step 1: Delineating a treatment area according to the distribution of soil salinization; Step 2: Excavating the soil in the treatment area and burying a concealed pipe; Step 3: Installing alkali-removing piles at fixed points; Step 4: Carrying out quantitative irrigation according to the salinity of the soil surface; Step 5: Adding alkali-removing treasure to the alkali-removing piles in a quantitative manner according to the alkalinity of the soil surface. Taking into account the different reductions in soil salinity and alkalinity in the dry and rainy seasons in the treatment area, effective regional alkali reduction is achieved by means of the alkali-removing piles combined with the quantitative addition of alkali-removing treasure; and the alkali-removing piles are combined with guide plates and evaporation-reducing belts to achieve a method of combining surface water infiltration into the concealed pipes in both the dry and rainy seasons, effectively reducing soil salinity and achieving a good effect of draining and reducing salt.

Description

Technical Field

[0001] This invention belongs to the field of saline-alkali soil improvement technology, specifically relating to a process for desalination and alkali reduction in alkalized saline soil. Background Technology

[0002] Soil salinization (or soil salinization) refers to the natural geological process by which salts continuously accumulate on the soil surface, forming saline soil. Simply put, it means the soil contains too much salt. If the salt content on the soil surface exceeds the tolerance range for plants, affecting their normal growth, soil salinization occurs. Saline soil is formed when groundwater rises and accumulates salts on the surface. The factors contributing to soil salinization include: groundwater containing a certain amount of salt; groundwater being shallow; and the presence of a driving force for groundwater rise, such as evaporation. Soil salinization is more likely to occur in arid climates and areas with high groundwater levels (above the critical water level). If groundwater contains a certain amount of salt, and its surface is close to the ground, and the area is relatively arid, the water rising to the surface through capillary action evaporates, leaving salts in the soil. Over time, the soil salt content gradually increases, leading to soil salinization. In many low-lying areas without drainage, when water evaporates from the depressions, salts remain, also forming saline-alkali land.

[0003] Underground pipe salinization involves laying pipes beneath the surface of saline-alkali land. Water is then supplied to the surface through rainfall or irrigation, causing the salt and alkali components in the soil to seep into the underground pipes and drain into drainage ditches, effectively reducing the soil's salinity. However, this method alone is not very effective for treating alkali-affected saline soils. Summary of the Invention

[0004] The purpose of this invention is to provide a process for desalination and alkali reduction of saline soil, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a process for desalination and alkali reduction of saline soil, comprising the following steps:

[0006] Step 1: Delineate the treatment area based on the distribution of soil salinization;

[0007] Step 2: Excavate the soil in the treatment area and lay underground pipes;

[0008] Step 3: Install alkali-repellent piles at designated locations;

[0009] Step 4: Irrigate in measured quantities based on soil surface salinity;

[0010] Step 5: Based on the alkalinity of the soil surface, add a measured amount of Alkali-Clearing Agent to the Alkali-Clearing Pile.

[0011] In order to delineate the treated and untreated areas, preferably, in step one, a salinity meter is used to measure the soil salinity, and the treated and untreated areas are delineated based on the regional salinity values.

[0012] To more effectively target soil salinity and alkalinity reduction, preferably, in step two, the excavation depth for the soil in the treatment area is 0.5 meters; the diameter of the inner cross-section of the underground pipe is 50 mm, and the edge of the underground pipe is connected to a water storage tank.

[0013] To more effectively remove alkali from the soil, preferably, in step three, alkali-removing stakes are driven into the soil of the treatment area at fixed points with a distance of 2 meters between adjacent points in the front, back, left, and right.

[0014] To make the alkali-reducing piles more effective in reducing soil alkali, preferably, the alkali-reducing pile includes a pile pipe with evenly distributed holes, an inner pipe at the center of the pile pipe, a collection pipe inside the pile pipe and sleeved on the inner pipe, a ring cover on the inner pipe, and a fixed cone inserted inside the inner pipe with the cone part at the bottom penetrating the pile pipe.

[0015] In order to effectively channel rainwater under the soil and reduce soil moisture evaporation, preferably, the top of the pile pipe is provided with plate grooves on four sides, guide plates are inserted on the plate grooves, and anti-evaporation strips are provided between the guide plates.

[0016] Preferably, in step five, the ring cap is pulled out of the pile tube, and the alkali-repellent agent is quantitatively added into the collection tube, and the ring cap is placed on the upper end of the pile tube.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In this invention, considering the different reduction of soil salinity in the treatment area during the dry and rainy seasons, the alkali-reducing piles are combined with a quantitative addition of alkali-reducing agents to achieve effective regional alkali reduction. Furthermore, by combining the alkali-reducing piles with the diversion plates and evaporation-reducing belts, the soil salinity can be effectively reduced in both the dry and rainy seasons by infiltrating surface water into underground pipes, resulting in good salt removal and alkali reduction effects. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional view of the main view of the present invention;

[0020] Figure 2 This is a top view of the present invention;

[0021] Figure 3 This is a schematic diagram of the alkali-repellent pile of the present invention;

[0022] Figure 4 This is a schematic diagram of the guide plate of the present invention.

[0023] In the diagram: 1. Concealed pipe, 2. Pipe pile, 3. Row of holes, 4. Inner pipe, 5. Collection pipe, 6. Ring cover, 7. Fixed cone, 8. Plate groove, 9. Guide plate, 10. Evaporation reduction zone. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] Figure 1 , Figure 2 , Figure 3 and Figure 4 A process for desalination and alkali reduction of saline soil includes the following steps:

[0026] Step 1: Delineate the treatment area based on the distribution of soil salinization; use a salinity meter to measure the soil salinity and alkalinity, and delineate the treatment area and non-treatment area based on the regional salinity and alkalinity values.

[0027] Soil salinity was measured by sampling at 100-meter intervals using a salinity meter. Areas with normal soil salinity were excluded, and treatment and non-treatment areas were marked by rolling lime.

[0028] Step 2: Excavate the soil in the treatment area and bury underground pipe 1; the excavation depth for the soil in the treatment area is 0.5 meters; the inner cross-sectional diameter of underground pipe 1 is 50 mm, and the edge of the underground pipe is connected to the water storage tank.

[0029] The concealed pipe 1 is made of PVC and is connected to other pipes using a four-way connector. Holes with a diameter of 3 mm are drilled on the concealed pipe 1 at 5 cm horizontal and 1 cm circumferential intervals. After placing the concealed pipe 1 into the excavated trench, it is first covered with 10 cm of crushed stone with a guaranteed 3 cm particle size, and then covered with soil. The purpose of this is to reduce the possibility of blockage caused by seepage water from above into the concealed pipe 1, allowing the seepage water to drain more smoothly into the concealed pipe 1.

[0030] Step 3: Install alkali-reducing piles at fixed points; drive alkali-reducing piles into the soil of the treatment area at fixed points with a distance of 2 meters between each pile and the pile pipe 2. Each alkali-reducing pile consists of a pile pipe 2, which is 45 cm long and has evenly spaced holes 3. An inner pipe 4 is integrally installed at the center of the pile pipe 2. A collection pipe 5 is inserted into the pile pipe 2 and is fitted onto the inner pipe 4. The collection pipe 5 is made of sponge. A ring cap 6 is pressed tightly onto the inner pipe 4. A fixed cone 7 is slidably inserted into the inner pipe 4, and the cone at the bottom of the fixed cone 7 penetrates the pile pipe 2. Both the fixed cone 7 and the pile pipe 2 are driven into the ground. During the dry season, the fixed cone 7 is inserted through the inner pipe 4 to reduce the evaporation of groundwater from the inner pipe 4. During the rainy season, the fixed cone 7 is pulled out of the inner pipe 4 to allow surface water to seep into the ground through the inner pipe 4. The top of the pile pipe 2 is provided with four grooves 8, which are arc-shaped grooves. A guide plate 9 is slidably inserted on the groove 8. The guide plate 9 is a plate-shaped structure with an arc cross section. Some guide plates 9 are in groups of two, with an anti-evaporation strip 10 bonded between them. Other guide plates 9 are single. The anti-evaporation strip 10 is a strip of plastic woven in a cross pattern. During the rainy season, the guide plates 9 without the anti-evaporation strip 10 are placed on the groove 8 to facilitate water flow to the adjacent pile pipe 2, thus facilitating the drainage of rainwater into the inner pipe 4. During the dry season, the guide plates 9 without the anti-evaporation strip 10 and the guide plates 9 with the anti-evaporation strip 10 are used in combination. Under the action of the anti-evaporation strip 10, the evaporation strip 10 effectively prevents soil moisture from evaporating and reduces the alkaline salt layer that rises to the surface due to evaporation.

[0031] Step 4: Irrigate in a measured amount based on the soil surface salinity.

[0032] When the dry season is long, pull the fixed cone 9 out of the inner pipe 4 to irrigate the surface of the treated area. During the infiltration of water into the soil, the salt and alkali components contained in the soil are discharged along with the water and discharged into the water storage tank through the underground pipe 1, thereby achieving the effect of reducing the soil salinity. After irrigation, insert the fixed cone 9 into the inner pipe 4. When the rainy season is long, pull the fixed cone 9 out of the inner pipe 4 and treat it in the same way.

[0033] Step 5: Based on the alkalinity of the soil surface, add a measured amount of alkali-reducing agent to the alkali-reducing pile, pull out the ring cap 6 from the pile pipe 2, add the measured amount of alkali-reducing agent to the collection pipe 5, and then cover the upper end of the pile pipe 2 with the ring cap 6.

[0034] Since soil alkalinity is relatively difficult to reduce compared to salinity, the alkalinity-reducing agent is drawn in through the collection pipe 5 and slowly discharged into the surrounding soil layers through the evenly distributed drainage holes 3. The agent is added in a quantitative manner according to the alkalinity level. With slow release and long-term supply, the alkalinity of each soil layer in the treatment area is effectively reduced.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A process for desalination and alkali reduction of saline soil, characterized in that, Includes the following steps: Step 1: Delineate the treatment area based on the distribution of soil salinization; Step 2: Excavate the soil in the treatment area and lay underground pipes (1); Step 3: Install alkali-repellent piles at designated locations; Step 4: Irrigate in measured quantities based on soil surface salinity; Step 5: Based on the alkalinity of the soil surface, add a measured amount of Alkali-Clearing Agent to the Alkali-Clearing Powder; The alkali-repellent pile includes a pile pipe (2), the pile pipe (2) is evenly provided with rows of holes (3), the pile pipe (2) is provided with an inner pipe (4) at the center position, the pile pipe (2) is provided with a collection pipe (5) and the collection pipe (5) is sleeved on the inner pipe (4), the inner pipe (4) is covered with a ring cover (6), and a fixed cone (7) is inserted into the inner pipe (4) and the cone part at the bottom of the fixed cone (7) penetrates the pile pipe (2). In step five, the ring cover (6) is pulled out of the pile tube (2), and the amount of alkali-repellent is added into the collection tube (5), and the ring cover (6) is placed on the upper end of the pile tube (2).

2. The process for desalination and alkali reduction of saline soil according to claim 1, characterized in that: In step one, a salinity meter is used to measure the soil salinity, and the treatment area and the non-treatment area are delineated based on the regional salinity values.

3. The process for desalination and alkali reduction of saline soil according to claim 1, characterized in that: In step two, the excavation depth for the soil in the treatment area is 0.5 meters; the inner cross-sectional diameter of the underground pipe (1) is 50 mm, and the edge of the underground pipe is connected to the water storage tank.

4. The process for desalination and alkali reduction of saline soil according to claim 1, characterized in that: In step three, alkali-repellent stakes are driven into the soil of the treatment area at fixed points with a distance of 2 meters between adjacent points in the front, back, left, and right.

5. The process for desalination and alkali reduction of saline soil according to claim 1, characterized in that: The top of the pile pipe (2) is provided with plate grooves (8) on four sides, and guide plates (9) are inserted on the plate grooves (8). Anti-evaporation belts (10) are provided between the guide plates (9).

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