The structure and method of using solid waste to comprehensively treat saline-alkali land

Abstract

The invention discloses a saline-alkali land comprehensive treatment structure and method adopting solid waste. The structure comprises a vertical layer structure, and the vertical layer structure comprises a lower drenching insulating layer, a middle planting soil layer and an upper waterproof protective layer; the drenching insulating layer comprises a layout of upper, middle and lower layers which are composed of ceramsite with diameters of 3-5 mm, 5-10 mm and 10-20 mm respectively; a layer of coal ash is laid on the top of the drenching insulating layer, and a seepage drainage pipeline is arranged on the bottom of the drenching insulating layer; the planting soil layer is prepared according to the land requirements, and desulfuration gypsum, coal ash, municipal domestic sludge and agricultural stalks are prepared with soil according to the requirements; the waterproof protective layer is composed of ceramsite. According to the structure and method, based on the cause of regional saline-alkali land, terrain, landform, climate, environment and quality of underground water, through comprehensive evaluation, full use of the kinds, characteristics and properties of the local solid waste, agricultural organic fertilizer, field experiments, reasonable proportioning, and combination of new and old technologies, radical treatment of the saline-alkali land is achieved.

Description

technical field [0001] The invention belongs to the field of soil improvement and regulation, and in particular relates to a structure and method for comprehensively treating saline-alkali land by using solid waste. Background technique [0002] Saline-alkali land refers to the deterioration of a series of soil physical properties caused by the accumulation of a large amount of salt in the soil, the structure is sticky, the air permeability is poor, the soil temperature rises slowly, the microbial activity in the soil is poor, the permeability coefficient is low, and the capillary action is strong, resulting in surface soil salinization. exacerbated. Saline-alkali soil is a type of soil in which crops are difficult to grow when the concentration of soluble salt or substitutable sodium ions in the soil reaches a certain level. That is to say, because the soil parent material and groundwater in saline-alkaline areas often contain a certain amount of salt, when the groundwater...

AI Technical Summary

Problems solved by technology

Harm to plants: 1. Cause physiological drought of plants, so that plant roots and seeds cannot absorb sufficient water from the soil when they germinate, and even cause water to leak from root cells, causing plant death

2. Injury to plant tissue, the protoplasm is damaged due to excessive salt accumulation in the plant, and protein synthesis is blocked, resulting in the accumulation of nitrogen-containing intermediate metabolites, causing cell damage

3. Affect the normal nutrition of plants. Due to the competition of sodium ions, the absorption of potassium, phosphorus and other nutrient elements by plants is reduced, and the transfer of phosphorus will also be inhibited, thus affecting the nutritional status of plants

4. Affect the opening and closing of stomata of plants. Under the action of high concentration of salt, the formation of starch in stomatal guard cells is hindered, so that the cells cannot be closed, so plants are prone to drought and wither

However, these existing technical means still have certain limitations, and it is still necessary to continuously explore better technical solutions for saline-alkali land treatment technology

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