Research on Settlement Regularity of Dredged Sludge
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Abstract:
Based on the load conditions of the sludge particles in water and basic theory of circular pipeline jet, the basic motion equations suitable for the sludge particles were established. Accordingly, the distribution of settling velocity of sludge particles, the velocity distribution of horizontal pipeline jet flow for each section, and the axial velocity distribution of different radial distances were obtained. A layered settlement model was constructed by fitting the motion regularity of the sludge particles along three directions: vertical, axial, and radial, which can simulate the settlement regularity of sludge particles with a grain size between 0.35 μm and 300 μm in the main district of the storage yard during a time period of 17 hours. The particle size was characterized by a fan-shaped distribution which decreased along the length of the storage yard. The sand particles were completely settled in the first 250 m of storage yard, the silty sand particles were settled along the flow direction in the storage yard, and the viscous sand particles mainly suspended in the water, which can be beneficial for the effective use of the storage yard and utilization of dredged sludge.
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