Method and device for governing saline-alkali soil

Abstract

The invention provides a method for controlling saline-alkali land, which includes at least one self-circulation process, and the self-circulation process includes: step 1, converting saline-alkaline water deposited in saline-alkali land into acidic water through an electrolysis system, and the content of the acidic water is The salt content is lower than the salt content of the saline-alkali water; step 2, rinse the saline-alkali land with the rinsing water containing the acidic water; meanwhile, a device according to the above method is also proposed, including: an electrolysis system for The saline-alkaline water deposited in the saline-alkali land is converted into acidic water, and the salt content of the acidic water is lower than that of the saline-alkali water; the rinsing system is used to prepare the rinsing water containing the acidic water for rinsing Saline-alkali land: According to the method and device of the present invention, no chemical substances are added, no fresh water is introduced, the salt content of saline-alkali land can be fundamentally reduced through the self-circulation process, and the saline-alkali land can be treated under low-cost and large-scale industrialization under suitable field conditions.

Description

technical field [0001] The invention relates to a method and a device for treating saline-alkali land, in particular to a method and a device for treating saline-alkali land through a self-circulation process without adding chemical substances and introducing fresh water. Background technique [0002] Salt in the soil is an essential nutrient for crop growth, but when the salt content in the soil is higher than 0.1%, crops will be inhibited from growing due to the stress of salt. Generally, we call the land with soil salt content exceeding 0.1% that inhibits plant growth as saline-alkali land. Saline-alkali land can be divided into mild, moderate and severe according to the salt content. Generally, the soil salt content of mild saline-alkali land is 0.1-0.3%, that of moderate saline-alkali land is 0.3-0.6%, and that of severe saline-alkali land is The salt level is >0.6%. [0003] At present, there are mainly four methods for controlling saline-alkali land: physical imp...

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Problems solved by technology

[0003] At present, there are mainly four methods for controlling saline-alkali land: physical improvement, chemical improvement, biological improvement and water conservancy improvement. The common problem is that the salt is not extracted from the soil, but the migration law of the salt is changed. Therefore, the treatment effect Poor and repeated, long treatment cycle, large capital investment and consume a lot of water resources

The patent with publication number CN1236537A discloses a method for physical improvement of saline-alkali land, which reduces the salt content of saline-alkali land by means of deep plowing, irrigation and drainage, and fresh water leaching. This method is simple to operate, but the improvement effect is poor and easy to repeat; the publication number is The patent of CN101134898A discloses a method for chemically improving saline-alkali land. The saline-alkali soil improving agent is used to isolate the salt to protect the root system of crops. Although this method can improve the survival rate of crops, it has a great impact on the ecological environment due to the complex composition of the improving agent. And due to the need for continuous investment, the cost is high; the patents with publication numbers CN1559709A and CN192645A disclose a method for improving saline-alkali land in a biological way, by planting salt-tolerant plants to absorb salt and reduce soil salinity, but the breeding cycle of salt-tolerant plants Long and poor regional adaptability; patents with publication numbers CN1765169A and CN1799301A disclose a method of improving saline-alkali land by means of water conservancy, and reduce soil salinity through the water conservancy of hidden pipes or salt drainage ponds. This method has high input costs and Year-round maintenance

The above four improvement methods are all based on a large consumption of fresh water resources, while the water resources in the saline-alkali land treatment area are all saline-alkali water, which must be transferred from other areas, thus exacerbating the contradiction in the distribution of fresh water resources in our country

[0004] In addition, patents with publication numbers CN10189804A, CN2740595Y, and CN1073664A disclose methods for reducing the salt content of saline-alkali water with centrifuges or electronic processing equipment. These methods can extract the salt in saline-alkali water in a short time, but due to the complexity and precision of the equipment, Therefore, the use of these equipment for saline-alkali land treatment must meet relatively strict technical conditions, resulting in high cost of saline-alkali water desalination and desalination, and it is difficult to realize large-scale and low-cost treatment of saline-alkali land; at the same time, desalination equipment needs to provide conventional electricity or power electricity as power, which is difficult to adapt Widely distributed and scattered saline-alkali land

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