Study on Rapid Flocculation and Dehydration Technique and Mechanism of Waste Mud from Bored Piles
Due to its high consistency,water content,and fluidity,waste mud from bored piles is challenging to settle naturally and poses environmental pollution risks.Rapid flocculation and dehydration are applied to this waste mud using inorganic flocculants FC and FS,polymer organic flocculant FM,and an inorganic-organic composite flocculant FC-FM.Tests,including sedimentation column curves,specific resistance,and turbidity measurements,are conducted.Results indicate that the optimal concentration for FS is 0.05 g/mL with a dosage of 10%of the slurry volume,while FM's optimal concentration is 0.005 g/mL with a 15%dosage.The FC-FM composite achieved superior performance over individual agents,with optimal dosages of 10 mL for FC and 15 mL for FM,resulting in a liquid phase volume of 28 mL initially and 35.5 mL after 1 day,with a minimum mud cake mass of 41.4 g after dehydration.This method achieved effective mud-water separation,with a turbidity removal rate of 45.1%.Under optimal flocculation and dehydration conditions,the lower layers of mud are efficiently solidified with curing agent S.Increasing the curing agent dosage from 3%to 7%raised the 28-day compressive strength of the soil from 1.08 MPa to 1.92 MPa.This approach enables the efficient treatment of waste mud from bored piles,reducing economic costs by one-third and providing a reference for similar waste drilling mud treatments.
万方数据
维普
