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Article
Engineering, Environmental
Linxin Yin et al.
Summary: This study proposed a new method named steam explosion (SE) coupled freeze-thaw (F-T) for enhancing the deep dewatering of municipal sewage sludge (MSS). The results showed that SE/F-T could effectively break the sludge gel-like structure and flocculate small sludge particles. The analysis also revealed that SE/F-T was conducive to decomposing extracellular polymer substances (EPS) and transforming and accumulating organic matter in sludge.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Yansha Zeng et al.
Summary: This study investigated the combined effects of polymeric aluminum chloride (PAC) and polyacrylamide (PAM) on sludge dewatering, aiming to uncover the underlying mechanisms. The co-conditioning of 15 mg g-1 PAC and 1 mg g-1 PAM achieved optimal dewatering performance, significantly reducing the specific filtration resistance (SFR) of the co-conditioned sludge. The findings provide insights into the improved dewatering performance and the thermodynamic mechanisms of sludge dewatering with different chemical conditioning.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Civil
Xudong Zhang et al.
Summary: This study compares numerical simulations with indoor evaporation tests to investigate water and salt transport in saline soils. The results show that soil salinity greatly impacts temperature changes and water retention. The modeled results agree with experimental data, indicating the effectiveness of the model in simulating water-heat-salt transport in different saline sites. This model is crucial for improving saline soils and preventing further soil salinization.
JOURNAL OF HYDROLOGY
(2023)
Article
Construction & Building Technology
Gangqiang Kong et al.
Summary: An accurate calculation of energy consumption is crucial for the design of underground metro stations. This study presents a simplified deterministic method that considers weather and heat gain uncertainty to evaluate the energy performance of metro stations. Monte Carlo technique was employed to confirm the probability distributions of load and energy demand and improve design robustness. Sensitivity analysis of input variables was conducted, and the simplified deterministic method proved to be more accurate in describing energy performance fluctuations compared to existing methods.
SUSTAINABLE CITIES AND SOCIETY
(2023)
Article
Environmental Sciences
Yang Xu et al.
Summary: Globally, there is a large accumulation of landfill sludge (LS) that requires urgent reduction and dewatering. A new method called freeze-thaw combined with step vacuum preloading (F/T-SVP) is proposed to address pollution and clogging issues caused by chemical conditioning combined with traditional vacuum preloading (TVP) in treating LS. Experimental study comparing TVP and SVP showed that F/T-SVP effectively improved drainage and consolidation of LS by avoiding clogging and achieving a more compact structure.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Zhiying Guo et al.
Summary: In this study, the addition of modified corn-core powder and sludge-based biochar improved the dewaterability of sludge. Different organics released during pretreatment had varying effects on heavy metal fractions, changing the toxicity and bioavailability of the treated sludge. The use of MCCP/SBB reduced the biological availability and ecological toxicity of heavy metals in the sludge.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Boran Wu et al.
Summary: This study aims to improve the dewaterability of waste-activated sludge (WAS) by using crystallization to drive the evolution of water occurrence states. The formation of CO2 hydrate in WAS was found to significantly enhance its dewatering performance. Additionally, the dissociation of hydrates could be used to recycle CO2 gas and reduce chemical consumption in the dewatering process. The research also revealed that the crystallization of water led to changes in the water occurrence state, resulting in improved water-solid separation. These findings provide a novel strategy for enhancing the dewatering performance of waste-activated sludge and increasing its environmental friendliness.
Article
Engineering, Civil
Xiaoya Bian et al.
Summary: This paper investigates the effect of equivalent initial water content (wei) on dredged sludge treated with the vacuum preloading-flocculation-solidification combined method (VP-FSCM). The study examines the deposition, dehydration, strength characteristics, and after-curing water content (wac) of the sludge at different wei through indoor experiments. The treatment efficacy of VP-FSCM is compared with a curing agent solidified sludge method. The research shows that higher wei leads to increased deposition, dehydration, undrained shear strength, and improved curing results. This study provides insights for the application of the physical consolidation-chemical solidification combined disposal technology and promotes the utilization of sludge resources.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Engineering, Geological
Huayang Lei et al.
Summary: This paper proposes an alternating prefabricated radiant drain vacuum preloading (APRD-VP) method, which has been proven to be more effective in dredged sludge reinforcement compared to traditional methods. The development of clogging formation and an empirical relationship between clogging range and settlement were also investigated.
GEOTEXTILES AND GEOMEMBRANES
(2023)
Article
Environmental Sciences
Kai Hui et al.
Summary: In this study, the combination of freeze-thaw and electrochemical treatment improved the dewatering performance of sludge and promoted the aggregation of sludge flocs into larger particles. The addition of activated carbon enhanced the effect of electrochemical treatment, significantly reducing the protein content and improving the combustion efficiency of the sludge cake.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Xudong Zhang et al.
Summary: This study investigates the influence mechanism of different refrigerating temperatures on the physical-mechanical properties of sludge treated by freeze-thaw method. The results show that the freeze-thaw treatment leads to the gathering of sludge particles, decrease in compressibility and void ratio, increase of permeability coefficient and consolidation coefficient, and improvement in shear performance.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Xiaodan Zhao et al.
Summary: PFSS was applied for the conditioning of excavated landfill sludge (LS), achieving the lowest water content and effectively removing slime and extracellular polymeric substances. PFSS is an economically sustainable conditioner for LS, integrating multiple functions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Boran Wu et al.
Summary: The cell membrane structure has a significant influence on the dewatering performance of waste-activated sludge, but there is still debate on the optimal extent of cell lysis. This study used non-chemical methods such as sonication, cyclic freezing-thawing, and DMSO amendment to lyse microbial cells and found that the extent of cell lysis had limited impact on the water occurrence states of the sludge.
Article
Engineering, Environmental
Hao Wang et al.
Summary: In this study, the influence of fines content and initial water content on frost susceptibility and freezing deformation properties of soils were evaluated through one-dimensional freezing deformation tests within a closed system. The study also utilized the pulsed nuclear magnetic resonance (P-NMR) method to investigate the pore water distribution and deformation mechanism of freezing soils. The results showed that soil temperature decrease led to a two-stage freezing of pore water, involving the freezing of capillary (or free) water followed by the conversion of adsorbed water into pore ice. Soil specimens with higher fines content exhibited higher unfrozen water content due to abundant adsorbed water from fine particles. The initial water content significantly affected the soil-freezing characteristic curve, especially when fines content was relatively high. Moreover, the freezing deformation properties of soil within a closed system were influenced by the initial water content, with higher degrees of saturation resulting in frost heave and lower degrees of saturation resulting in frost shrinkage. The study underscored the importance of both freezing of pore water and thinning of adsorbed water in determining frost heave or frost shrinkage of soil, with a critical degree of saturation separating the two properties.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Yajun Wu et al.
Summary: This study improves the freeze-thaw vacuum method for sludge treatment by analyzing the spatio-temporal distribution relationship through numerical fitting of temperature change. The results show that the alternating freeze-thaw vacuum procedure substantially enhances dewatering and reduction of sludge, as well as improves its mechanical properties.
ENVIRONMENTAL RESEARCH
(2022)
Review
Environmental Sciences
Xudong Zhang et al.
Summary: This manuscript provides a comprehensive description of the characteristics of sludge, the advantages and disadvantages of preconditioning methods, and the action mechanisms. It also introduces the principles and engineering applications of mechanical dewatering techniques, especially the use of vacuum preloading as an in-situ dewatering technology in sludge. The cost analysis of different methods is conducted to explore their feasibility and provide new insights for engineering applications.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Yajun Wu et al.
Summary: This study investigates the influence of different freezing temperatures on the dewatering properties, compression and consolidation features, and microstructural change mechanism in landfill sludge (LS). The results reveal that the freezing temperature significantly affects the dewatering, compression, vacuum drainage, consolidation, and microstructure characteristics of LS. Freeze-thaw cycles can greatly improve sludge's permeability and consolidation properties, and suitable freezing temperatures can enhance its performance.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Morteza Hassanpour et al.
Summary: This study developed a hydrothermal treatment process with the assistance of FeCl3 for deep dewatering of anaerobically digested sludge. The treatment improved sludge dewaterability and flowability through mechanisms such as hydrolysis of sludge flocs, formation of double electric layers, and in-situ generation of iron oxyhydroxide nanoparticles.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Chemical
Qiyun Feng et al.
Summary: This study optimized the preparation conditions of polysilicate ferric, polysilicate aluminum ferric, and polysilicate aluminum ferric magnesium and investigated their performance in sludge dewatering pretreatment. The results showed that polysilicate improved sludge dewatering performance through adsorption bridging effect and charge neutralization.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Yuecheng She et al.
Summary: The combination of calcium oxide (CaO) and freezing/thawing pretreatment effectively improved the production of volatile fatty acids (VFAs) and dewatering performance of sludge, while reducing the species number of total microbial population and enhancing the abundance of acid-producing bacteria. This approach provides a feasible and efficient alternative for large scale waste activated sludge treatment, with considerable estimated net profits.
Article
Environmental Sciences
Yajun Wu et al.
Summary: By utilizing Fe2+ activated Na2S2O8 for the treatment of landfill sludge and fresh sludge, significant improvements were observed in dewatering performance, particle size reduction, and consolidation and permeability characteristics under optimal dosage conditions. This research provides valuable guidance for the deep dewatering of sludge.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Geological
Xudong Zhang et al.
Summary: The spacing of PVDs has a significant impact on the consolidation effect of vacuum preloading, as halving the spacing can improve drainage and consolidation effects, leading to better solidification of sludge.
SOILS AND FOUNDATIONS
(2021)
Review
Engineering, Environmental
Bingdi Cao et al.
Summary: Sludge is a byproduct of sewage treatment containing pathogens, heavy metals, organic pollutants and other toxic substances. Chemical preconditioning is crucial for improving sludge dewatering efficiency, and different chemical conditioning technologies have a significant impact on the dewatering process. Research and evaluation of various enhanced dewatering technologies are important for improving dewatering efficiency.
Article
Construction & Building Technology
Minh Chien Vu et al.
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Engineering, Environmental
Xuran Liu et al.
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Environmental Sciences
Xudong Zhang et al.
Article
Environmental Sciences
Xiaodan Zhao et al.
Article
Computer Science, Interdisciplinary Applications
Kun Meng et al.
COMPUTERS AND GEOTECHNICS
(2020)
Article
Environmental Sciences
Yajun Wu et al.
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Materials Science, Characterization & Testing
Yongfeng Deng et al.
JOURNAL OF TESTING AND EVALUATION
(2019)
Article
Environmental Sciences
M. Carrasco et al.
WATER AIR AND SOIL POLLUTION
(2019)
Article
Environmental Sciences
Yuqi Wu et al.
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Engineering, Environmental
Wei Wu et al.
Article
Engineering, Environmental
Faqian Sun et al.
Article
Engineering, Environmental
Guang Yang et al.
Article
Engineering, Environmental
Maria Ruiz-Hernando et al.
CHEMICAL ENGINEERING JOURNAL
(2014)
Article
Engineering, Environmental
Huihui Tian et al.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2014)
Article
Engineering, Geological
Weian Lin et al.
GEOTEXTILES AND GEOMEMBRANES
(2014)
Review
Engineering, Environmental
Chai Siah Lee et al.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2014)
Article
Engineering, Environmental
Kai Hu et al.
Article
Soil Science
Ustun Sahin et al.
SOIL & TILLAGE RESEARCH
(2008)
Article
Chemistry, Physical
T Tao et al.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2005)
