电渗法快速降低淤泥含水率的试验研究

Experimental study on rapid reduction of silt's water content by electro-osmosis

电渗法可以快速降低淤泥的含水量,提高其不排水抗剪强度,实现淤泥的资源化处理,变废为宝。但是如何提高电渗效率,节约能源是该方法在工程应用中需要解决的一大难题。利用自行研制的试验装置,进行自然排水和3种类型电渗方案排水降低淤泥含水率的对比试验。通过测量各组试验过程中的排水量、电流和电势,以及试验前后土样含水率和不排水抗剪强度,从能量耗散和电渗效率及经济效益角度研究土体的性状。结果表明:采用电渗法对疏浚淤泥进行处理时,可以通过平行移动电极、控制合理电极间距和通电时间,达到高效节能降低淤泥含水率的目的。

Electro-osmosis can reduce the water content of silt quickly and improve its undrained shear strength.Hence,silt can be turned into resources by electro-osmosis.But the major problem to be resolved is to raise the efficiency and save energy during engineering applications.The comparative tests between natural drainage and three ways of reducing water content by electro-osmosis in silt were conducted using a newly developed apparatus.Water discharge,current and electric potential were recorded during the tests,and water content and undrained shear strength were measured at the beginning and the end of the tests.Then soil characteristics were studied from the point of energy consumption,electro-osmotic efficiency and costs on the basis of the measured data.The results show that when dealing with dredged silt by electro-osmosis,the purposes of improving efficiency and saving energy to reduce the water content are achieved by moving the electrodes parallel and searching appropriate conditions of electrodes distance and working time.