脱硫石膏改良土壤过程中的磷迁移规律及影响因素分析

发布时间：2019-03-11 19:05

【摘要】：通过设置室内土柱淋洗试验,探究施用不同的脱硫石膏(FGD-Gypsum,简称FGDG)对不同土壤中磷的迁移变化规律及影响。2种FGDG(1号、2号)分别与2种土壤(A土、B土)均匀混合,石膏施用质量分数为0%、1%、2.5%、5%。结果表明,FGDG的施入能明显改善土壤的渗透性,其导水速率比对照组提高65%~91%。土壤固磷率随着FGDG施加量的增加而相应上升,A土施加FGDG组的固磷率比对照组提高了95.6%,B土平均提高47.0%;对2种石膏磷吸附动力学分析表明,2号FGDG的固磷率比1号高43.6%,这与石膏的溶出率和杂质Cl-含量有关。与A土相比,B土的粒度偏小,黏粒比例高48.4百分点,导水速率下降98.1%,B土中有效磷减少程度较A土高40%左右。由结果可见,FGDG有望成为新的高效控磷方法,能明显减少磷向水体排放量;固磷率既受土壤自身粒度特征、导水性、磷本底值影响,也与FGDG溶解后的Ca2+含量密切相关。
[Abstract]:Through indoor soil column leaching experiments, the effects of different desulfurization gypsum (FGD-Gypsum, FGDG) on phosphorus transport in different soils were investigated. Two kinds of FGDG (No. 1, No. 2) and two kinds of soil (soil A), respectively, were used to study the effects of different desulfurization gypsum on phosphorus transport in different soils. Soil B) was evenly mixed and the gypsum application was 0%, 1%, 2.5%, and 5% by mass. The results showed that FGDG application could significantly improve the soil permeability, and the water conduction rate was 65% and 91% higher than that of the control group. The phosphorus fixation rate of soil increased with the increase of FGDG application. The phosphorus fixation rate of soil A and B increased by 95.6% and 47.0%, respectively, compared with the control group. The analysis of phosphorus adsorption kinetics of two kinds of gypsum shows that the phosphorus fixation rate of No. 2 FGDG is 43.6% higher than that of No. 1, which is related to the dissolution rate of gypsum and the content of impurity Cl-. Compared with A soil, the particle size of B soil is smaller, the clay ratio is 48.4% higher, the water diversion rate is decreased by 98.1%, and the available phosphorus in B soil is about 40% higher than that of A soil. The results show that FGDG is expected to be a new efficient phosphorus control method, which can significantly reduce the discharge of phosphorus into water, and the phosphorus fixation rate is not only affected by the characteristics of soil particle size, water conductivity, phosphorus background value, but also closely related to the content of Ca2 after dissolution of FGDG.
【作者单位】：东华大学环境科学与工程学院;上海市环境科学研究院;上海应用技术学院;
【分类号】：S156.4

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