Research on seepage law of dredged sludge in dewatering process under vacuum loading
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Abstract:
Based on the theor y of por ous media and Darcy's law , t he var iable pressur e head permeameter was used as the test ap2 paratus to inv est igat e t he impact s of different pr essure loading s in the range of 0 to 100 kPa o n the seepage law of dredg ed sludg e of Dianchi Lake in Yunnan Pro vince dur ing the dew atering pr ocess. The seepag e v elocity, permeabilit y coefficient, f iltr a2 tion co nstant, filt ratio n and seepage v olume, and moisture content and por osity of filter cake after t he end of loading under dif2 fer ent pressure lo ading s wer e measured to character ize the seepag e effects o f sludg e. The results indicated that the seepag e law of w ater in the sludg e under different pressur e loading s meets the Darcy. s law, which means that seepag e velo city has a linear co rr elation wit h pressure g radient . The g reater the pressur e lo ading is, the better the seepag e effect is. Seepage per formance of dr edg ed sludge is the best and moisture content of filter cake is the lowest w hen the pr essure loading is 100 kPa.
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