Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, Hubei University of Technology, Wuhan, Hubei 430068, China; Future Industries Institute, Mawson Lakes Campus, University of South Australia (UniSA), South Australia, Adelaide, Australia.
Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, Hubei University of Technology, Wuhan, Hubei 430068, China.
Environ Res. 2020 May;184:109335. doi: 10.1016/j.envres.2020.109335. Epub 2020 Mar 4.
Electro-dewatering (EDW) is an emerging technology for improved sludge/sediment dewatering enabling subsequent cost effective treatment for toxicity and pathogenic reduction if required and/or disposal, but the effects of sediment/sludge properties on the efficacy of EDW remain unclear. Here we investigate EDW in the absence of chemical conditioning which can result in secondary pollution. The influence of sediment/sludge volatile solids content (VS), electrical conductivity (EC), pH and zeta potential (ζ), on mechanical and electrical behaviors determining dewaterability and energy consumption (P) was investigated. Optimization of EDW parameters increased the final solids content (DS) from 40 wt% to more than 55 wt% for river sediment, while the solids content in municipal sludge was only increased from 10 wt% to 15-20 wt%. Multiple linear regression and statistical analysis showed that electro-dewatering performance is primarily affected by VS and P is mainly affected by EC. A theoretical basis for engineering design and selection of operational parameters for sludge/sediment electro-dewatering is provided by this study.
电脱水（EDW）是一种新兴的技术，可改善污泥/沉淀物的脱水性能，使其能够进行后续的、具有成本效益的毒性和病原体减少处理，如果需要的话，还可以进行处理和处置，但是沉淀物/污泥特性对 EDW 效果的影响仍不清楚。在这里，我们研究了在没有可能导致二次污染的化学调理的情况下进行的 EDW。研究了沉淀物/污泥挥发性固体含量（VS）、电导率（EC）、pH 值和 ζ 电位（ζ）对机械和电气行为的影响，这些行为决定了脱水性能和能耗（P）。优化 EDW 参数可将河沉淀物的最终固体含量（DS）从 40wt%提高到 55wt%以上，而市政污泥的固体含量仅从 10wt%提高到 15-20wt%。多元线性回归和统计分析表明，电脱水性能主要受 VS 影响，而 P 主要受 EC 影响。本研究为污泥/沉淀物电脱水的工程设计和操作参数选择提供了理论依据。
