Research On Effect Of Coal Water Slurry Gasification Slag On Aeolian Sandy Soil Improvement And Growth Of Crop

In recent years,due to the large-scale promotion of coal gasification technology in my country,modern coal chemical companies have produced a large amount of coal-water slurry gasification slag during the production process,which has caused the stock of coal gasification slag to increase year by year.The traditional treatment methods are mostly stacking and Landfilling causes serious environmental pollution and wastes precious land resources,and severely restricts the local ecological environment and economy.With the country's policy on source reduction and resource utilization of solid waste,how to deal with coal gasification slag Processing and development and utilization have become hot issues.Based on the above reasons,the experimental plan of waste treatment based on local conditions is adopted,the waste coal water slurry gasification slag is used as a kind of aeolian sand soil improvement material,the aeolian sand soil and the coal water slurry gasification slag are mixed,and indoor and field tests are adopted.Through the changes of soil physical and chemical properties,water retention performance and growth and yield of different crops,the effect of coal water slurry gasification residue on aeolian sandy soil is explored.And draw the following main conclusions:? The coal-water slurry gasification slag can significantly improve the physical and chemical properties of aeolian sandy soil.With the increase in the amount of gasification slag,the soil bulk density and sand content decreased significantly(P<0.05),and the silt content increased significantly(P<0.05).The soil texture changed from sandy soil to sandy loam,and coal water slurry The fine particles in the gasification slag can be filled into the large pores of the sandy soil,effectively reducing the proportion of the large pores of the aeolian sandy soil,increasing the capillary action of the soil,increasing the adsorption force between the soils,and achieving the effect of improving the soil structure;total soil nutrient content Increase,improve soil fertility,and obviously improve the shortcomings of low nutrient content supplied by sandy soil.? Coal water slurry gasification slag can significantly improve the water retention performance of aeolian sandy soil.With the increase in the amount of gasification slag blended,the saturated water content,capillary water holding capacity and field water holding capacity increased significantly(P<0.05),the increase ranges were13.53%?158.93%,and the capillary water holding capacity increased by7.12%?126.95%,The field water holding capacity increased by 23.19%?252.47%,and the increase of soil moisture constant was significantly positively correlated with the amount of gasification slag(r>0,P<0.05);it had a significant impact on the water characteristics of windy sandy soil,and the soil moisture characteristics The curve results show that the incorporation of gasification slag can increase the effective water content of aeolian sandy soil and increase the soil water holding capacity.That is,under the same water suction,with the increase of gasification slag,the higher the soil moisture content,the The specific water capacity gradually decreases;the test results of the horizontal diffusivity show that with the increase in the amount of gasification slag,the horizontal diffusivity gradually decreases,the horizontal diffusion time gradually increases,and the Boltzmann parameter gradually decreases,and the level The diffusivity has a good exponential function relationship with the diffusion time.The soil moisture diffusion rate and the distance of the infiltration peak per unit time also show a decreasing trend,and both have a good power function relationship with the diffusion time,indicating that the incorporation of coal water slurry Gasification slag can effectively reduce the soil infiltration capacity of aeolian sandy soil.? The coal water slurry gasification slag can promote the growth characteristics and yield of crops to varying degrees.Field experiments were conducted to study the effect of gasification residue on the growth and yield of four common local crops(Helianthus tuberosus,prosomillet,corn Yidan and Chidan).It was found that the coal water slurry gasification residue had varying degrees of growth characteristics and yields For the growth environment of 4 kinds of crops,the incorporation of gasification residue can significantly increase the water content of the 0-20 cm soil layer,reducing the loss of soil nutrients with water,plus the nutrients contained in the gasification residue itself The elements also significantly increase the nutrient content of the soil,which plays an important role in the growth and development of crops and increase the yield.Comprehensive analysis suggests that coal-water slurry gasification slag can effectively improve the physical and chemical properties of aeolian sandy soil,significantly improve the water retention performance of aeolian sandy soil,and significantly promote the growth,development and yield of the four local common crops tested.It can be a kind of soil amendment for aeolian sandy soil,providing a theoretical basis for the improvement of aeolian sandy soil by gasification slag in the local desertification area,and providing reliable theoretical support and factual basis for the batch and resource utilization of coal water slurry gasification slag.Provide ideas for realizing high-quality development of local ecological priority and green development,and provide references for solid waste utilization in other regions.