Journal
ENVIRONMENTAL RESEARCH
Volume 184, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.109335
Keywords
Electro-dewatering; Sludge properties; River sediment; Energy consumption; Multiple linear regression
Funding
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07101003-008]
- National Natural Science Foundation of China Youth Fund Project [51508214]
- Three Gorges Follow-up Research Project [2017HXXY-05]
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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 (zeta) on mechanical and electrical behaviors determining dewaterability and energy consumption (P-E) was investigated. Optimization of EDW parameters increased the final solids content (DSf) 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-E 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.
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