滴灌条件下脱硫石膏对盐碱土改良效果及安全性的影响

发布时间：2018-06-26 13:50

本文选题：脱硫石膏 + 盐碱土　；参考：《干旱区资源与环境》2017年11期

【摘要】：为实现燃煤烟气脱硫废弃物再利用,使其能运用于新疆大面积盐碱地改良,在新疆农八师134团盐碱地施用脱硫石膏,研究滴灌条件下脱硫石膏对盐碱土壤理化性质以及土壤重金属含量的影响,评估脱硫石膏改良盐碱土的可行性和安全性。结果表明:盐碱地施用脱硫石膏后土壤容重降低,0.25mm团聚体数量增加,土壤孔隙度增加;土壤pH值、碱化度和电导率降低,尤其在0-10cm、10-20cm土层改善效果明显;土壤中Na~+、Cl~-含量降低,0-10cm土层较其他土层Na~+含量下降明显,于对照相比下降40.62%,表层土壤中Ca~(2+)、SO_4~(2-)含量增加,有利于降低土壤盐碱危害;施用脱硫石膏对土壤Hg含量没有影响,Cr元素含量下降,各项重金属元素含量均远低于国家环境二级标准,说明施用脱硫石膏不会对土壤造成重金属污染。综上所述,脱硫石膏对盐碱地有一定的改良效果且不会对土壤安全造成威胁。
[Abstract]:In order to realize the reuse of coal-fired flue gas desulphurization waste and make it suitable for the improvement of large area of saline and alkaline land in Xinjiang, desulfurization gypsum was applied in the salt and alkali land of 134th regiment of Nong Bashi Division, Xinjiang. The effects of desulphurization gypsum on the physical and chemical properties of saline-alkali soil and the content of heavy metals in the soil were studied in order to evaluate the feasibility and safety of desulphurization gypsum in improving saline-alkali soil. The results showed that the soil bulk density decreased by 0.25 mm and the soil porosity increased after the application of desulphurized gypsum on saline-alkali soil, and the soil pH, alkalinity and electrical conductivity decreased, especially in 0-10 cm ~ (-20) cm soil layer. The content of Na ~ (2 +) in soil decreased obviously in 0-10cm soil layer than in other soil layers, and decreased by 40.62% in comparison with the control, and the content of Ca ~ (2) so _ 4 ~ (2-) in surface soil increased, which was beneficial to reduce the harm of soil salinization and alkali-alkali. The application of desulphurized gypsum had no effect on the content of Hg in soil, and the contents of heavy metals were far lower than that of the national environmental secondary standard, indicating that the application of desulphurized gypsum would not cause heavy metal pollution to the soil. To sum up, desulphurization gypsum has certain improvement effect on saline-alkali land and will not threaten soil safety.
【作者单位】：石河子大学/新疆兵团绿洲生态农业重点实验室;
【基金】：国家重点研发计划课题(2016YFC0501406) 兵团科技攻关与成果转化项目(2016AD022)资助
【分类号】：S156.4

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