This study investigated the effects of electro-dewatering on subsequent low-temperature drying at various potentials and the characteristics of low-temperature air-drying sludge were explored through experiments and multi-physical modeling. Experimental results showed that the extracellular polymeric substance (EPS) content in the sludge was reduced during electro-dewatering process, even the species of organic matter was changed, as well as the dewatered cake tend to form many seepage channels, crack and a certain number of holes. These changes in the properties and structure were conducive to the subsequent low-temperature drying process. For air-drying process, the mass of the sludge cake variation was simulated and results were consistent with the experimental phenomenon. Firstly, the weight of the sludge cake was decreased approximately linearly with time, then tended to stable and reached the dewatering limitation finally. The applied higher electric field intensity (25 V cm⁻¹) in the front-end electro-dewatering were conducive to promote water vapor diffusion activity in air-drying stage. Energy consumption and yield analysis results indicated that the combined technology has lower energy consumption and higher yield than that of directly low-temperature drying.

本研究考察了电脱水对后续不同电位下低温干燥的影响，并通过实验和多物理建模探索了低温风干污泥的特性。实验结果表明，电脱水过程中污泥中胞外聚合物(EPS)含量降低，甚至有机物种类发生变化，脱水滤饼容易形成许多渗流通道、裂缝和一定数量的渗流。的孔。这些性质和结构的变化有利于后续的低温干燥过程。对于风干过程，模拟了泥饼质量的变化，结果与实验现象一致。第一，泥饼重量随时间近似线性下降，然后趋于稳定，最终达到脱水极限。施加更高的电场强度 (25 V cm^-1 ) 在前端电脱水有利于促进风干阶段的水蒸气扩散活动。能耗和产量分析结果表明，组合工艺比直接低温干燥能耗更低，产量更高。