Experimental Study on Influencing Factors of Flocculation and Dewatering of Slurry Discharged from High Water Content Bored Piles
To address the challenges of treating slurry with high water content discharged from bored piles,such as high costs of direct transportation,leakage risks,and environmental impact,a flocculation technique is applied to achieve rapid mud-water separation and reduction of discharged slurry volume.Experiments on sedimentation columns,turbidity,specific filtration resistance,and the water content of dewatered mud cakes are conducted,incorporating both organic flocculant FN and inorganic flocculant FP under various hydraulic parameters to investigate the factors influencing flocculation and dehydration efficiency.Results indicate that adding suitable amounts of FN and FP flocculants under optimal hydraulic conditions yields effective dewatering.At a rotation speed of 400 r/min,the water content of the dewatered mud cake reduces to 97.4%,while a stirring duration of 120 seconds reduces it to 90.4%.As the stirring temperature increases,the water content slightly decreases from 97.8%at 15℃to 89.1%at 40℃.The SRF value of the slurry discharged from bored piles decreases to(4.4×1012 m/kg)with the addition of composite flocculants,significantly lower than that of single-flocculant-treated slurry.The combined addition of FN and FP enhances electric neutralization and net capture-sweeping functions,while the flocculant's adsorption-bridging effect causes significant particle aggregation in the slurry.Therefore,under appropriate hydraulic conditions,suitable composite flocculants effectively treat high water content slurry.
high water content slurryslurry-water separationcompound flocculanthydraulic parametersflocculation and dewatering effectnet capture-sweeping effect
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维普
