Soil structure for filling sunken land with sludge to achieve land reclamation

Abstract

The invention provides a soil structure for filling sunken land with sludge to achieve land reclamation. The soil structure comprises a water-holding and heat-insulation layer, an organic matter layer, an upper soil layer, a water and nutrient retention and soil organism inhabitation layer and a lower soil layer from top to bottom in sequence. Composting and ceramsite production are conducted by using the sludge as a raw material, the water and nutrient retention capacity of damaged soil is improved, an inhabitation environment is provided for soil organisms, and the soil aggregate formation speed is increased; an eutrophic living environment and a non-eutrophic living environment are provided for the soil organisms, the diversity of the soil organisms is increased, and the novel soil structure is constructed. Filling and reclamation of the soil in the sunken land are conducted, land sources are vitalized, the required soil amount is reduced, and the dilemma that there are more peopleand less land in China is solved.

Description

technical field [0001] The invention relates to the fields of land improvement and solid waste utilization and environmental protection, in particular to a soil configuration for land reclamation of subsidence land filled with sludge. Background technique [0002] According to statistics, from 1987 to 2015, the area of ​​land subsidence caused by coal mining in my country was about 1.3651 million hm 2 , the reclaimed area is 307,100 hm 2 , in the process of mine transformation and industrial alternation, how to develop mining abandoned land and revitalize land stock resources is an urgent problem to be solved. The agricultural reclamation of mining subsidence land is often regarded as the main goal, but general land reclamation, especially land reclamation of subsidence land, requires a large amount of soil filling, the cost of foreign soil is high, and it causes secondary pollution to the environment. At the same time, the process of foreign soil It also damages the struc...

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Problems solved by technology

The agricultural reclamation of mining subsidence land is often regarded as the main goal, but general land reclamation, especially land reclamation of subsidence land, requires a large amount of soil filling, the cost of foreign soil is high, and it causes secondary pollution to the environment. At the same time, the process of foreign soil It also damages the structure of the soil and reduces its ability to retain water and fertilizer

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