动态条件下各形态内源磷释放动力学研究

Internal Phosphorus Release Kinetics at Dynamic Conditions

实验在流量为3L/d,水通量变化率为1.17 L(水)/g(湿泥).d-1的动态条件下模拟自然条件下内源磷的释放过程,对内源磷的释放过程、形态变化以及释放速率进行考察。研究表明,内源磷释放可分为两个阶段:快速释放阶段,释放速率由铁磷释放决定;慢速释放阶段,释放速率由铁磷释放和钙磷释放共同决定。整个释放过程中内源磷形态分布有较大变化。动力学分析表明总内源磷释放在表观上符合4.5级动力学反应,铁磷释放在表观上符合5.4级动力学反应,钙磷释放在表观上符合一级动力学反应。

At release experiments,when maintaining steep diffusion gradient with 3L/d flux and 1.17 L_((water))/g_((Wet Sediment))·d^(-1) water flux rate,internal phosphorus(P) release included two phases:(1) Fast release phase: Total P release rate is governed by Fe-P release rate;(2) Slow release phase:Total P release rate depends on Fe-P and Ca-P release rate.The kinetic studies on the Total P,Fe-P and Ca-P under such release experiment conditions show that the decay equations present 4.5,5.4 and 1 order respectively.