Piezoelectric effect was firstly employed to improve dewatering efficiency of sludge. It was found that the piezoelectric effect could be driven directly by the pressure of pressure filtration process, without any additional energy. This piezo-dewatering process coupled piezoelectric effect with pressure filtration could efficiently remove moisture of sludge. Under 0.6 MPa for 2 h, moisture content (MC) and weight of sludge could be reduced to 63.9% and 3.2 g from 96.7% and 50 g by the piezo-dewatering process with 0.45 g t-BaTiO₃. This piezo-dewatering efficiency was much higher than that of usual conditioning-pressure filtrations using CaO, FeCl₃ or polyacrylamide (PAM) as the conditioners. And the piezo-dewatering process assisted by PAM could further decrease MC and weight of the sludge to 54.9% and 2.1 g, correspondingly, which complied to the advanced dewatering requirement (MC < 60%). The favorable piezo-dewatering efficiency was contributed to the piezo-catalytic oxidation and the electric role of remnant piezo-field. The finding of this piezo-dewatering mechanism offered an inspiring look at developing the emerging dewatering technology.

压电效应首先被用于提高污泥的脱水效率。结果表明，压电效应可以由压滤过程的压力直接驱动，无需任何额外的能量。这种将压电效应与压力过滤相结合的压电脱水工艺可以有效去除污泥中的水分。在0.6 MPa下2 h，0.45 g t -BaTiO ₃的压电脱水工艺可将污泥的含水量（MC）和重量从96.7%和50 g降至63.9%和3.2 g 。这种压电脱水效率远高于使用 CaO、FeCl ₃的通常调节压力过滤的效率或聚丙烯酰胺 (PAM) 作为调理剂。而PAM辅助的压电脱水工艺可以进一步降低污泥的MC和重量，相应地降低到54.9%和2.1 g，符合高级脱水要求（MC < 60%）。有利的压电脱水效率有助于压电催化氧化和残余压电场的电作用。这种压电脱水机制的发现为开发新兴脱水技术提供了鼓舞人心的视角。