磷石膏堆场渗滤液对土壤吸附磷特性的影响  

Effects of phosphogypsum stockyard leachate on soil adsorption of phosphorus

作　　者：牟诗萌 李洁[1] 王波[1] MOU Shi-meng;LI Jie;WANG Bo(School of Ecology and Environment,Chengdu University of Technology,Chengdu 610059,Sichuan,China)

机构地区：[1]成都理工大学生态环境学院,四川成都610059

出　　处：《地下水》2022年第2期131-136,183,共7页Ground water

摘　　要：磷吸附特性对土壤磷有效性和磷素迁移及其环境效应有重要影响。研究磷石膏堆场渗滤液对不同土壤磷吸附特性的影响,可为磷石膏堆场风险评价提供理论依据。供试土壤为四川典型磷石膏堆场区土壤,通过开展批式静态吸附实验探究了不同土壤(酸性潮土、石灰性潮土、紫色中性土)对磷的吸附-解吸特性及在磷石膏渗滤液特征指标影响下不同土壤对磷的吸附特性。结果表明:三种类型土壤的吸附磷速率大小及吸附固定磷能力大小均表现为:石灰性潮土>酸性潮土>紫色中性土,三种类型土壤对磷的吸附量和解吸量呈显著正相关关系;在磷石膏渗滤液特征指标的影响下三种类型土壤吸附量分别降低了29.25%、6.81%和33.93%,单因素试验表明土壤对磷的吸附主要受磷石膏渗滤液pH值及F^(-)浓度影响,结合土壤基本理化性质分析表明,磷石膏渗滤液对土壤吸附磷的影响程度与土壤的有机质、活性氧化铝、活性氧化铁及碳酸钙含量相关。Phosphorus adsorption characteristics have important effects on soil phosphorus availability and phosphorus transport and its environmental effects.Studying the effect of phosphogypsum yard leachate on phosphorus adsorption characteristics of different soils can provide a theoretical basis for risk assessment of phosphogypsum yard.The test soil is the soil of typical phosphogypsum storage area in Sichuan.The adsorption-desorption characteristics of different soils(acidic fluvo-aquic soil,calcareous fluvo-aquic soil,and purple neutral soil) on phosphorus and its adsorption in phosphogypsum were investigated through batch static adsorption experiments.Phosphorus adsorption characteristics of different soils under the influence of leachate characteristic indexes.The results showed that the adsorption rate of phosphorus and the adsorption and fixation capacity of the three types of soil were all in the following order:calcareous fluvo-aquic soil>acidic fluvo-aquic soil>purple neutral soil,and the three types of soil had significant phosphorus adsorption and desorption capacity.A positive correlation;under the influence of the characteristics of phosphogypsum leachate,the adsorption capacity of the three types of soil decreased by 29.25%,6.81% and 33.93%,respectively.The single factor experiment shows that the adsorption of phosphorus by soil is mainly affected by the pH value and F^(-) concentration of phosphogypsum leachate.combined with the analysis of basic physical and chemical properties of soil,showed that the effect of phosphogypsum leachate on soil adsorption of phosphorus was related to the content of soil organic matter,activated alumina,activated iron oxide and calcium carbonate.

关 键 词：磷石膏 磷 土壤 吸附 

分 类 号：X53[环境科学与工程—环境工程] S153.61[农业科学—土壤学]