2种南方土壤污水渗滤土地处理系统中磷元素的放射性示踪动力学比较实验

Comparative experiments on the radioactive tracer kinetics of phosphor element in sewage filter soil disposal system of two southern soils

为了比较不同土壤的污水渗滤土地处理系统对磷的去除效果,在模拟土柱中采用磷同位素(32P)示踪技术,研究污水中磷进入红壤和紫色土不同土层后的行为动力学特征。实验结果表明,污水中磷在红壤中滞留率高于紫色土,而在紫色土中的迁移性则强于红壤。对于紫色土,污水带入的各无机磷组分按比例大小排序为:磷酸铁盐(Fe-P)>闭蓄态磷(O-P)>磷酸铝盐(Al-P)>磷酸钙盐(Ca-P);在红壤中则是Al-P>Fe-P>O-P>Ca-P。这些无机磷组分在不同深度土壤中的表现也有差异。

In order to investigate the effect of soil types on phosphorus elimination of sewage filter soil processing system,the author established two simulated soil columns by purple soil and red soil respectively and adopted 32P trace approach to study dynamic behaviors of the phosphorus in various layers of two soil columns.The results indicated that the retention ratio of phosphorus in red soil is higher than that in purple one,but the motility in purple soil was stronger than that in red one.The various inorganic phosphorus in purple soil were ordered as Fe-P〉O-P〉Al-P〉Ca-P,while they were ranked as Al-P〉Fe-P〉O-P〉Ca-P in red soil.These inorganic components showed diversity in the different layers of soil.