生物化学作用对污泥固化体渗透性的影响

Biochemical effects on permeability of solidified sludge

通过固化技术降低污泥的透水性,可以减少二次污染的风险,但是外界生物化学条件的改变会引起污泥固化体渗透性的变化。针对这个问题,采用强化污泥固化体所处的生物化学条件的方法,进行了不同酸性渗透液以及微生物激活环境下固化体渗透性的试验。试验结果表明,提高污泥固化水平可以显著降低污泥的渗透性,但是酸性环境下固化体的透水性将增加;污泥固化体渗透性的改变,不仅取决于酸性渗透液总的渗透量,也受酸的强度的控制;微生物的活动能够明显降低污泥固化体的透水性。

The secondary pollution from sludge is reduced as a result of the lower permeability of sludge treated by the S/S（solidification and stabilization） treated. However with the change of the biochemical condition of the environment, the permeability of solidified sludge will change as well. To evaluate the environmental impact, the biochemical condition of solidified sludge was enhanced; and the permeability test with acid and nutritional filtration liquid was performed on the solidified body. The experimental results showed that increasing the solidification level would lower the permeability of sludge, but the permeability will be increased under acid condition. The permeability change of solidified sludge was not only decided by the total infiltration volume of infiltration liquid but also controlled by the strength of acid; and microorganism activity could remarkably decrease the permeability of solidified sludge.