火电厂烟气脱硫石膏对重度苏打盐化土饱和导水率的影响

Effect of Power Plant Flue Gas Desulfurization Gypsum on Saturated Hydraulic Conductivity of Heavy SodaSaline Soil Using Lysismeter

以大同盆地重度苏打盐化土为研究对象，采用土柱模拟的方法，研究火电厂烟气脱硫石膏3种用量（15、30、60t·hm-3）下土壤饱和导水率的变化规律，分析了脱硫石膏不同施用量和土壤饱和导水率的关系，旨在为大同盆地苏打盐化土改良提供理论支持和借鉴。结果表明：脱硫石膏对3个土层的土壤的饱和导水率均有提高作用，其中表层土壤（0—10cm）提高的幅度最大，其次是10—20cm，20～40cm底层土壤提高幅度最小；脱硫石膏对表层（0～10cm）土壤的饱和导水率提高速率以及效率最高，随着土层深度的增加，脱硫石膏对土壤饱和导水率的提高速率及效率逐渐降低；脱硫石膏的经济用量应为30t·hm2；重度苏打盐化土饱和导水率与脱硫石膏施用量无显著正相关关系（黔0．05）。

In this paper, we applied soil column simulation method to study the effect of power plant flue gas desulfurization gypsum on satu- rated hydraulic conductivity of heavy soda-saline soil in the Datong basin of Shanxi Province. The amount of desulfurization gypsum was 15, 30 t · hm-2 and 60 t· hm-2. The results showed that different amount of desulphurization gypsum all could significantly improve the saturated hydraulic conductivity of heavy soda-saline soil; especially, the increase of saturated hydraulic conductivity in different soil layers appeared in a descending order as 0-10 cm〉10-20 cm〉20~40 cm; further, with the depth of the soil layer the rate and efficiency of saturated hydraulic conductivity reduced gradually. There was no significant correlation between the saturated hydraulic conductivity and the application amount of desulphurization gypsum （P〉0.05）. Considering the economic perspective, the best application amount of desulphurization gypsum was 30 t · hm-2.