摘要
[目的]探讨磷石膏改良吹填土的机理。[方法]通过室内模拟脱盐试验,探讨磷石膏对吹填土理化性质的改良效果。[结果]施用磷石膏可提高吹填土的脱盐速率,以混施效果最好,与对照相比差异达0.01显著水平;磷石膏的施入使单位体积水量的淋盐效率下降,增加淋洗用水量;混施磷石膏可以部分抑制吹填土脱盐碱化,淋洗后pH比对照低0.6个单位,总碱度、RSC、SAR都低于对照,而且可使吹填土的离子组成由NaCl型转为CaSO4或Ca(HCO3)2型。[结论]磷石膏对吹填土淋洗脱盐不但有促进作用,而且可以改善吹填土的理化性状。不同施用方式的效果存在一定的差异,以与吹填土混合施用效果最好。
[Objective]The mechanism that phosphogypsum improved dredged sediment was investigated.[Method] The laboratory leaching simulation experiment was conducted to study the desalting effect of phosphogypsum on dredged sediment.[Result] Phosphogypsum accelerated the salt moving down and mixed phosphogypsum had a very significant difference（P〈0.01） compared to the control.Leaching effect of phosphogypsum on dredged sediment decreased in unit volume water.Mixed phosphogypsum had a potent inhabits of desalting alkalization of dredged sediment.pH decreased 0.6 compared to the control,and total alkalinity,RSC and SAR were lower than these of the control.After washing,ionic composition was from NaCl to CaSO4（or Ca（HCO3）2）.[Conclusion] Phosphogysum could increase desalting and improve the soil characteristics.the effects had large difference in different applying method.The effects of mixed phosphogypsum was the best.
出处
《安徽农业科学》
CAS
北大核心
2011年第28期17249-17251,共3页
Journal of Anhui Agricultural Sciences
关键词
磷石膏
吹填土
脱盐
淋洗
Phosphogypsum
Dredged sediment
Desahing
Leaching
