In this study, a magnetic micro-particle conditioning–pressurized vertical electro-osmotic dewatering（MPEOD） process with magnetic micro-particle conditioning–drainage under gravity–mechanical compression–electr...In this study, a magnetic micro-particle conditioning–pressurized vertical electro-osmotic dewatering（MPEOD） process with magnetic micro-particle conditioning–drainage under gravity–mechanical compression–electrical compression（MMPC–DG–MC–EC） stages was established to study the distribution and migration of water, extracellular polymeric substances（EPS）, and other organic matter in the activated sludge（AS） matrix at each stage.Results showed that the MPEOD process could attain 53.52% water content（WC） in dewatered AS with bound water（BW） and free water（FW） reduction rates of 82.97% and 99.67%,respectively. The coagulation and time-delayed magnetic field effects of magnetic microparticles（MMPs） along the MMPC–DG–MC stages initiated the transformation of partial BW to FW in AS. EC had a coupling driving effect of electro-osmosis and pressure on BW, and the changes in pH and temperature at EC stage induced the aggregation of AS flocs and the release of partial BW. Additionally, MMPs dosing further improved the dewatering performance of AS by acting as skeleton builders to provide water passages. Meanwhile, MMPs could disintegrate sludge cells and EPS fractions, thereby reducing tryptophan-like protein and byproduct-like material concentrations in LB-EPS as well as protein/polysaccharide ratio in AS matrix, which could improve AS filterability. At EC stage, the former four Ex/Em regions of fluorescence regional integration analysis for EPS were obviously reduced, especially the protein-like substances in LB-and TB-EPS, which contributed to improvement of AS dewaterability.展开更多
In response to the severe flood control challenges in the Taihu Lake Basin,this study focuses on the coordinated operation of newly constructed projects-such as the Xinmeng River and Xingou River-and the existing wate...In response to the severe flood control challenges in the Taihu Lake Basin,this study focuses on the coordinated operation of newly constructed projects-such as the Xinmeng River and Xingou River-and the existing water conservancy system.Addressing the drainage difficulties in the upstream Huxi Area and the Wucheng-Xixi-Yuxi Area,the research adopts a technical framework of"scenario-driven analysis-scheme simulation-multi-objective decision-making."Through simulation and optimization based on mathematical models and an intelligent decision-support system,an operationally feasible joint operation scheme is proposed.The results demonstrate that optimized joint operation can significantly unleash the flood control potential of water conservancy projects,providing valuable methodological insights and a practical reference for coordinated operation and intelligent decision-making in complex river network regions.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51478041,51678053)Major Projects on Control and Rectification of Water Body Pollution(Nos.2012ZX07105-002-03,2013ZX07202-010)
文摘In this study, a magnetic micro-particle conditioning–pressurized vertical electro-osmotic dewatering（MPEOD） process with magnetic micro-particle conditioning–drainage under gravity–mechanical compression–electrical compression（MMPC–DG–MC–EC） stages was established to study the distribution and migration of water, extracellular polymeric substances（EPS）, and other organic matter in the activated sludge（AS） matrix at each stage.Results showed that the MPEOD process could attain 53.52% water content（WC） in dewatered AS with bound water（BW） and free water（FW） reduction rates of 82.97% and 99.67%,respectively. The coagulation and time-delayed magnetic field effects of magnetic microparticles（MMPs） along the MMPC–DG–MC stages initiated the transformation of partial BW to FW in AS. EC had a coupling driving effect of electro-osmosis and pressure on BW, and the changes in pH and temperature at EC stage induced the aggregation of AS flocs and the release of partial BW. Additionally, MMPs dosing further improved the dewatering performance of AS by acting as skeleton builders to provide water passages. Meanwhile, MMPs could disintegrate sludge cells and EPS fractions, thereby reducing tryptophan-like protein and byproduct-like material concentrations in LB-EPS as well as protein/polysaccharide ratio in AS matrix, which could improve AS filterability. At EC stage, the former four Ex/Em regions of fluorescence regional integration analysis for EPS were obviously reduced, especially the protein-like substances in LB-and TB-EPS, which contributed to improvement of AS dewaterability.
文摘In response to the severe flood control challenges in the Taihu Lake Basin,this study focuses on the coordinated operation of newly constructed projects-such as the Xinmeng River and Xingou River-and the existing water conservancy system.Addressing the drainage difficulties in the upstream Huxi Area and the Wucheng-Xixi-Yuxi Area,the research adopts a technical framework of"scenario-driven analysis-scheme simulation-multi-objective decision-making."Through simulation and optimization based on mathematical models and an intelligent decision-support system,an operationally feasible joint operation scheme is proposed.The results demonstrate that optimized joint operation can significantly unleash the flood control potential of water conservancy projects,providing valuable methodological insights and a practical reference for coordinated operation and intelligent decision-making in complex river network regions.
