不同pH值黏土层对有机磷渗透的影响分析

Effect of Clay with Different pH Values on Organophosphorus Pervasion

采用施压条件下有机磷溶液渗透通过粘性土层的实验,模拟有机磷越流通过弱透水层的过程,研究粘土层pH值不同时对有机磷渗透迁移的影响规律。分析认为,有机磷渗透通过粘性土层的能力随着土层pH值的升高而降低;pH为7.5时矿化率为98.75%,迁移率为1.25%,土层pH值≥8.5时有机磷未穿透粘土层,阻滞效果明显。矿化形成的PO34-离子占总磷的百分比随着土层pH值的升高而增加,与Ca2+离子结合形成沉淀物的能力增强,粘土pH值的升高对有机磷的降解转化具有明显的促进作用。

Organophosphor was put on pressure to permeate the cohesive soil in this experiment,for simulating the process of organophosphor leakage permeating the aquitard,in order to explore the influence of clayey pH on pervasion and migration of organophosphorus.The findings show that pervasive ability of organophosphorus fall with the rise of clayey pH,mineralization rate is 98.75% and migrating rate is 1.25% when pH is 7.5.Organophosphorus can not permeate the clay when pH≥8.5 and retardation of clay on organophosphor is obvious.The proportion of PO43-contributing to TP will raise with pH of clay,and the ability of forming precipitate with Ca2＋ enhance also.The rise of clayey pH has the obvious advance on the degradation and conversion of organophosphorus.