Laboratoire de Thermique Energétique et Procédés (EAD 1932), UPPA, ENSGTI, BP 7511, 64075, Pau Cedex, France.
Department of Chemical Engineering, Building 35, Clayton Campus, Monash University, Victoria, 3800, Australia.
Water Res. 2016 Oct 15;103:109-123. doi: 10.1016/j.watres.2016.07.016. Epub 2016 Jul 14.
Electrically assisted mechanical dewatering, known as electro-dewatering (EDW), is an alternative emerging technology for energy-efficient liquid/solids separation in the dewatering of wastewater sludge. In this study, the performance of the electro-dewatering (EDW) process for activated wastewater sludge was investigated. The influence of the operating modes; being the timing of voltage (U-EDW) or current (I-EDW) application to either or both the filtration and compression stages, and the influence of the applied pressure (in successive 30 min pressure steps) were studied. The results showed that by delaying the application of the electric field to the filter cake compression stage, there was a potential saving in power consumption of around 10-12% in the case of U-EDW and about 30-46% in the case of I-EDW. The increase of the applied pressure from 0.5 to 12 bar during the filter cake compression stage leads to an increase in electro-dewatering kinetics. The results also reveal that at a low electric field level the increase of the processing pressure has a relatively pronounced effect on the dewatering process. At high levels of the electric field, a minimum processing pressure (4-6 bar) is required to improve the electrical contact between the electrode and the sludge and thus lower the energy consumption.
电辅助机械脱水，又称电脱水（EDW），是一种新兴的节能型液体/固体分离技术，可用于废水污泥的脱水。本研究考察了电脱水（EDW）工艺对活性废水污泥的处理效果。考察了操作模式的影响，即电压（U-EDW）或电流（I-EDW）施加时间，施加到过滤和压缩阶段中的一个或两个阶段，以及施加压力（在连续 30 分钟的压力步骤中）的影响。结果表明，通过将电场延迟施加到滤饼压缩阶段，可以在 U-EDW 的情况下节省约 10-12%的功耗，在 I-EDW 的情况下节省约 30-46%的功耗。在滤饼压缩阶段，将施加压力从 0.5 增加到 12 巴，会加快电脱水动力学。结果还表明，在低电场水平下，增加处理压力对脱水过程有相对显著的影响。在高电场水平下，需要最低处理压力（4-6 巴）来改善电极和污泥之间的电接触，从而降低能耗。
