What influence sediment particle size?4 answersSediment particle size is influenced by various factors. The annual scouring and silting amount of a river section was found to decrease with an increase in sediment particle size. Rainfall intensity and slope gradient were identified as important factors affecting particle size distribution (PSD) of sediment by sheet erosion. In the case of pore-filling hydrate-bearing sediment, smaller particle size led to a reduction in average pore and throat radius, while increasing the fractal dimension of the pore system. The nucleation induction time of gas hydrates in sediment media was found to decrease with larger particle sizes. Additionally, the particle size of sediment influenced the quality and quantity of dissolved organic matter (DOM) extracted from sediments, with larger particle sizes resulting in lower DOM content and acidic functional group content.
What are the conditions of flocculation happening in a sedimentation tank?5 answersFlocculation in a sedimentation tank occurs under specific conditions. The addition of a flocculating agent helps increase the contact area between the agent and the sewage, ensuring uniform mixing and improved effectiveness of the agent. The tank design plays a crucial role in facilitating flocculation. The tank may have different areas such as a mixing area, a flocculation area, and a sedimentation area. In the mixing area, a pipeline mixer quickly mixes the coagulant and softener, forming complete flocs. The tank may also have a stirring mechanism to enhance the flocculation process. Additionally, the tank may include a decontamination mechanism and cleaning mechanisms to remove floating objects and maintain the filtration effect. Overall, the conditions for flocculation in a sedimentation tank involve the proper addition of flocculating agents, effective mixing, and the removal of floating objects to ensure efficient sedimentation and water quality.
What is the impact of pulp particle size on the sedimentation of a fruit drinks?4 answersThe impact of pulp particle size on the sedimentation of fruit drinks is influenced by various factors. One study found that the mean particle size and ratio of particle size to mean particle size were important parameters. Another study demonstrated that the lengthwise length of pulp fragments longer than 500μm affected the texture and natural feeling of the drink. Additionally, the use of stabilizers such as gelatinized starch can reduce or eliminate the settling of insoluble matter, resulting in a homogeneous cloudy appearance throughout the drink. The sedimentation rate in centrifugal field and cyclone efficiency were also found to be dependent on particle size. Furthermore, the interactions between particles can lead to self-induced hydrodynamic diffusion, which affects the apparent width of the size distribution during sedimentation. Overall, the particle size of pulp in fruit drinks plays a significant role in their sedimentation behavior and overall quality.
How to remove the grain size effect on trace metal concentrations in the sediment and suspended particulate material?5 answersTo remove the grain size effect on trace metal concentrations in sediment and suspended particulate material, several approaches can be used. Regression analysis is commonly employed to eliminate the dependency of concentrations on grain size. Robust regression methods, such as least absolute values regression, provide an objective alternative to least squares regression and can effectively remove the influence of outliers. Another approach is to deduct the grain size-led offset from measured elemental abundances, which allows for the elimination of the grain size effect. Additionally, bioleaching experiments have shown that smaller sediment particles result in higher solubilization ratios for heavy metals, indicating that the removal of smaller particles can help reduce the grain size effect. Overall, these methods provide ways to mitigate the influence of grain size on trace metal concentrations in sediment and suspended particulate material.
What materials that can improve the effectivity rate of sedimentation?2 answersThe effectiveness rate of sedimentation can be improved by using various materials. In one study, the authors investigated the sedimentation process using different solid materials such as Silicate, Calcium Carbonate, and Barium Carbonate. They found correlations between sedimentation rate constants and particle sizes, as well as slurry consistency. Another paper proposed a rapid material sedimentation device that simplifies the sedimentation process and improves water circulating efficiency. This device includes an inclined pipe sedimentation layer and overflowing holes for uniform distribution. Additionally, the addition of coarser particles to dilute phosphatic slimes was found to hasten settling and improve sedimentation curves. High-rate settlers, which have a shallow depth, have also been shown to be effective in wastewater treatment, with short detention periods preventing the development of anaerobic conditions. Alternative processes such as centrifugation, filtration, and ultrafiltration can also improve sedimentation for specific materials, but they come with higher costs and complexities.
How do you reduce particle size in powder?5 answers