| 摘要 |
A method for dispersing and agglomerating the excavated soil is provided to secure an environment-friendly effect by recycling gravels and sand as aggregates according to each purpose by separating the gravel, sand, and concentrated particle clay fluid through the dispersant and coagulant input processes and reusing or discharging the water to the river through a purification process. A method for dispersing and agglomerating the excavated soil comprises the steps of: removing the excavated soil in the underground base rock; pouring a dispersant into the excavated soil and then transferring the excavated soil to a first vibrating screen by a twin mixer; cleaning gravels over 5m/m and using the gravel for recycled materials by sorting out the excavated soil, and discharging the excavated soil below 5m/m to a second vibrating screen; cleaning aggregates over 1.5m/m and using the aggregates for recycled materials, and discharging the excavated soil below 1.5m/m to a third vibrating screen; cleaning fine aggregates of 1.5~0.2m/m and using the aggregates for recycled materials, and discharging slurry below 0.2m/m to a lower tank; discharging the precipitated slurry and overflowing the turbid water with low turbidity to a storing tank; adding P.A.C(Poly Aluminum Chloride) and a coagulant to the slurry in transferring the slurry discharged from the storing tank by a pump; transferring the slurry containing the coagulant, to a high-speed precipitation tank; discharging floc settled down in the high-speed precipitation tank, to a filter press and precipitating and separating the floc by the clean water; discharging the clean water to a filtrate storing tank by dewatering the floc discharged from the high-speed precipitation tank; collecting the discharged clean water in a filtering tank and discharging the clean water to a second high-speed precipitation tank; blowing the air by pouring the clean water discharged from the second high-speed precipitation tank, into an aeration tank; and regulating pH by discharging the clean water to a pH regulating tank. |
