Field Treatment of Storage Sludge and Stability Analysis of Overlying Municipal Waste Landfilling

Storage sludge has high water content and low shear strength, which limits the capacity expansion of overlying municipal landfilling. Few studies have addressed the field treatment of large amounts of storage sludge due to the variability of the depth of geotechnical property. This paper proposes a stratified treatment method for storage sludge, based on the in situ characterization of layered sedimentary patterns of the storage sludge acquired from the Qizishan landfill in China. Additionally, the stability of the landfilling above the sludge pond is analyzed using the Morgenstern–Price and limit equilibrium slice method, which considers the layered strength properties of solidified sludge. The treated sludge has a significant decrease in average water content from 1398% to 88% and an increase in average cohesion to 23.52 kPa. The high content of clay particles, low amount of solidification products, and high water content together result in the high sensitivity to the water content of the strength of deep solidified sludge. For a 40-m high waste body, stability analysis suggests a sliding surface across the raw sludge pond, while the critical surface remains outside the treated sludge pond and the safety factor is increased from 0.934 to 1.464. The validated stratified treatment provides valuable references for the treatment of deep sludge.

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Utilizing preferential vaporization to enhance the stability of spray combustion for high water content fuels

Combustion and Flame ◽

10.1016/j.combustflame.2014.01.012 ◽

2014 ◽

Vol 161 (8) ◽

pp. 2008-2014 ◽

Cited By ~ 7

Author(s):

Fei Yi ◽

Richard L. Axelbaum

Keyword(s):

Water Content ◽

High Water ◽

Spray Combustion ◽

High Water Content ◽

The Stability

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Stability of cactus-pear powder during storage

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v20n2p169-173 ◽

2016 ◽

Vol 20 (2) ◽

pp. 169-173

Author(s):

Plúvia O. Galdino ◽

Rossana M. F. de Figueirêdo ◽

Alexandre J. de M. Queiroz ◽

Pablícia O. Galdino ◽

Tâmila K. da S. Fernandes

Keyword(s):

Water Content ◽

Water Activity ◽

Reducing Sugars ◽

Titratable Acidity ◽

High Water ◽

Soluble Solids ◽

High Water Content ◽

Cactus Pear ◽

Total Titratable Acidity ◽

The Stability

ABSTRACT The stability of cactus-pear powder, obtained by the process of spray drying for 40 days, was evaluated under controlled conditions of relative air humidity (83%) and temperature (25 and 40 °C). The whole pulp was characterized with regard to its physico-chemical parameters: pH, total titratable acidity, soluble solids, water content, total solids, ashes, reducing sugars, total sugars, non-reducing sugars, luminosity, redness, yellowness and water activity. The stored samples in powder were evaluated every 10 days for water content, water activity, total titratable acidity and color (luminosity, redness and yellowness). The whole pulp was slightly acidic and perishable, due to the high water content. During storage, the packages did not prevent water absorption, thus increasing water content and, consequently, water activity. Yellowness oscillated along the storage time, but the predominance of the yellow color was not affected.

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Experimental Study on Solidified Sludge with High Water Content

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.4265 ◽

2011 ◽

Vol 71-78 ◽

pp. 4265-4268

Author(s):

Zhe Wang ◽

Ju Hao Hu ◽

Li Li Yan

Keyword(s):

Water Content ◽

High Sensitivity ◽

Good Deal ◽

High Water ◽

Engineering Properties ◽

High Water Content ◽

Construction Sites ◽

Engineering Construction ◽

Main Research ◽

Strength Character

A good deal of high water content sludge which is produced in engineering construction, with high water content, low strength, high compressibility, low permeability, high sensitivity and other undesirable engineering properties, and often contaminated. How to deal with and make rational use of high water content sludge becomes the hot topic discussed by engineering and academia. The material used in this study is sludge with high water content from the Metro construction sites in Hangzhou. In this paper, our main research is the influences of the different contents of cement, lime, gypsum, fly-ash on the curing strength character of silt. The product structure was analyzed by XRD.

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Strength properties of dredged soil at high water content treated with soda residue, carbide slag, and ground granulated blast furnace slag

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.118126 ◽

2020 ◽

Vol 242 ◽

pp. 118126 ◽

Cited By ~ 1

Author(s):

Jun He ◽

Xiao-kang Shi ◽

Zhi-xiang Li ◽

Lei Zhang ◽

Xiao-ying Feng ◽

...

Keyword(s):

Blast Furnace ◽

Water Content ◽

Blast Furnace Slag ◽

High Water ◽

Strength Properties ◽

High Water Content ◽

Dredged Soil ◽

Granulated Blast Furnace Slag ◽

Carbide Slag ◽

Furnace Slag

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Strength and Leaching Behavior of Contaminated Mining Sludge at High Water Content Stabilized with Lime Activated GGBS

Materials ◽

10.3390/ma14216524 ◽

2021 ◽

Vol 14 (21) ◽

pp. 6524

Author(s):

Traore Abdoul Fatah ◽

Rongjun Zhang ◽

Xiaosong Huang ◽

Junjie Zheng ◽

Yu Miao ◽

...

Keyword(s):

Heavy Metal ◽

Water Content ◽

Experimental Tests ◽

High Water ◽

Aluminum Silicate ◽

High Water Content ◽

Strength Development ◽

Efficient Technology ◽

The Stability ◽

Mining Sludge

Sludge management is one of the major challenges in mining activities. The direct disposal of contaminated mining sludge can bring severe damages to the environment and community. Solidification/stabilization (S/S) is a very efficient technology for the treatment of contaminated mining sludge because it improves the stability of sludge dumping sites and reduces the leachability of contaminants. Very few studies investigate the S/S of mining sludge, especially with high water content. This paper investigated the effectiveness of S/S for the treatment of mining sludge at high water content by using quick lime (CaO) activated ground granulated blast furnace slag (GGBS) in comparison to ordinary Portland cement (OPC). To evaluate the mechanical, leaching, and microstructural behavior of CMS at high water content stabilized by lime-activated GGBS and OPC, a series of laboratory experimental tests were performed. Experimental results indicated that increasing the dosage of binder led to increased strength and decreased leachability of the heavy metal. In contrast, an increase in the water content of the mixture resulted in a decrease in compressive strength and an increase in the leachability of heavy metals. On the other hand, lime-activated GGBS mixes had substantially better performance than OPC mixes in the aspect of strength development of treated mining sludge and showed comparable capability of heavy metal stabilization compared to OPC. The microstructural tests revealed the formation of different hydration products such as calcium silicate hydrate, calcium aluminum silicate hydrate, ettringite, hydrotalcite, and heavy metal complexes in CG and OPC mixes.

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High Water Content Hydrogels with Instant Mechanical Recovery, Anti-High Temperature and Anti-High Ionic Strength Properties

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2021.126456 ◽

2021 ◽

pp. 126456

Author(s):

Shengzhen Hou ◽

Xiujun Wang ◽

Jian Zhang

Keyword(s):

High Temperature ◽

Ionic Strength ◽

Water Content ◽

High Water ◽

Strength Properties ◽

High Ionic Strength ◽

High Water Content ◽

Mechanical Recovery

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Study on the Bearing Characteristics and Application of the Filling Body in Original Roadway Filling and Nonpillar Driving

Lithosphere ◽

10.2113/2021/4238008 ◽

2021 ◽

Vol 2021 (Special 4) ◽

Author(s):

Wenbao Shi ◽

Yan Li ◽

Jucai Chang

Keyword(s):

Water Content ◽

Coal Mining ◽

High Water ◽

High Water Content ◽

Working Face ◽

Geological Conditions ◽

Analysis Laboratory ◽

The Stability ◽

And Control

Abstract Original roadway filling and nonpillar driving can effectively solve the difficulty facing mining replacement in the stope of deep mines. As the bearing characteristics of the filling body in the original roadway play a crucial role in the structural stability of the overlying strata, with the recovery and geological conditions of 62210 working face in Xinzhuangzi Coal Mine, Huainan Mining Group, China, as the background, this study analyzed the stability characteristics of the filling body in the original roadway through comprehensive research methods of theoretical analysis, laboratory tests, and onsite monitoring. The results disclose that the filling body in the original roadway should boost early strength, strong bearing capacity, and long-term weakening. When the water-cement ratios are 1 : 1, 1.5 : 1, 2 : 1, 2.5 : 1, and 3 : 1, the strengths of the filling body are 1.12 MPa, 0.93 MPa, 0.57 MPa, 0.33 MPa, and 0.21 MPa at 2 h and 5.63 MPa, 4.66 MPa, 2.87 MPa, 1.65 MPa, and 1.02 MPa at 48 h, respectively. The strengths surge by 5 times within 2 d on the whole and reach the maximum at about 7 d, i.e., 8.12 MPa, 6.91 MPa, 6.60 MPa, 3.95 MPa, and 2.20 MPa, respectively. As time goes, the water content of the filling body gradually decreases and the compressive strength plunges. This demonstrates that the rapid solidification material with a high water content can satisfy the requirements of the bearing characteristics of the original roadway filling body. With reference to numerical simulation and the data monitored onsite, it can be known that the filling body in the original roadway can support the roof effectively and control the surrounding rock deformation of newly excavated roadways in the lower section. The research results provide theoretical guidance for coal mining under similar geological conditions and serve as reference for safe and efficient coal mining.

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Strength Characteristics and Heavy Metal Leaching Behavior of Contaminated Mining Sludge at Extra High Water Content Solidified/Stabilized with Lime Activated GGBS or OPC

10.21203/rs.3.rs-305929/v1 ◽

2021 ◽

Author(s):

Traore Abdoul Fatah ◽

Rong-Jun Zhang ◽

Xiao-Song Huang ◽

Yu Miao ◽

Aamir Khan Mastoi

Keyword(s):

Heavy Metal ◽

Compressive Strength ◽

Water Content ◽

High Water ◽

High Water Content ◽

Strength Development ◽

Efficient Technology ◽

Heavy Metal Leaching ◽

The Stability ◽

Mining Sludge

Abstract Sludge management is one of the major challenges in mining activities. The direct disposal of contaminated mining sludge can bring severe damages to the environment and community. Solidification/Stabilization (S/S) is a very efficient technology for the treatment of contaminated mining sludge because it not only improves the stability of sludge dumping sites but also reduces the leachability of contaminants. Very few studies investigate the S/S of mining sludge, especially with extra high water content. This paper investigated the effectiveness of S/S for the treatment of mining sludge at extra high water content by using quick lime (CaO) activated ground granulated blast furnace slag (GGBS) in comparison to ordinary Portland cement (OPC). To evaluate the mechanical, leaching, and microstructural behavior of mining sludge at extra high water content stabilized by lime activated GGBS and OPC, a series of laboratory experiments were performed, including unconfined compressive strength (UCS), toxicity characteristics leaching procedure (TCLP), X-Ray diffraction, and scanning electron microscopy (SEM) tests, etc. Experimental results indicated that increasing the binder content led to increased strength and decreased leachability of the heavy metal. In contrast, an increase in the water content of the mixture resulted in a decrease in compressive strength and an increase in leachability of heavy metals. On the other hand, lime activated GGBS had substantially better performance than OPC in the aspect of strength development of treated mining sludge and moreover showed comparable capability of heavy metal stabilization in contrast to OPC.

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Hydrogels as Antibacterial Biomaterials

Current Pharmaceutical Design ◽

10.2174/1381612824666180213122953 ◽

2018 ◽

Vol 24 (8) ◽

pp. 843-854 ◽

Cited By ~ 6

Author(s):

Weiguo Xu ◽

Shujun Dong ◽

Yuping Han ◽

Shuqiang Li ◽

Yang Liu

Keyword(s):

Mechanical Properties ◽

Drug Delivery ◽

Tissue Engineering ◽

Water Content ◽

Oxygen Permeability ◽

Structural Diversity ◽

High Water ◽

Clinical Applications ◽

High Water Content ◽

Biomedical Field

Hydrogels, as a class of materials for tissue engineering and drug delivery, have high water content and solid-like mechanical properties. Currently, hydrogels with an antibacterial function are a research hotspot in biomedical field. Many advanced antibacterial hydrogels have been developed, each possessing unique qualities, namely high water swellability, high oxygen permeability, improved biocompatibility, ease of loading and releasing drugs and structural diversity. In this article, an overview is provided on the preparation and applications of various antibacterial hydrogels. Furthermore, the prospects in biomedical researches and clinical applications are predicted.

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