钱江隧道盾构废弃泥浆的混凝分离

为了实现钱江隧道盾构废弃泥浆的无害化处理,对盾构废弃的砂土泥浆和粘土泥浆分别进行混凝分离的实验条件研究,结果表明:对于砂土泥浆,密度为1.20 g/cm3有利于实现高效的泥水分离;PAM作为絮凝剂的分离效果最好;混凝分离的最优化分离条件为:投药量为150 mg/L,pH为8左右,水力条件为以300 r/min搅拌1 min,再以80 r/min搅拌20 min。对于粘土泥浆,密度为1.10 g/cm3有利于实现高效的泥水分离;PAM作为絮凝剂的分离效果最好;混凝分离的最优化分离条件为:投药量为150 mg/L,pH为6左右,水力条件为以300 r/min搅拌1 min,再以80 r/min搅拌20 min。该实验为废弃泥浆的进一步处理奠定了基础。

Coagulation and separation of waste slurry from Qianjiang River Tunnel shield

In order to implement harmless treatment of waste slurry,coagulation separation was proposed to treat waste slurry from Qianjiang River Tunnel shield.The treatment experiments with sandy mud indicate that efficient separation of the mud is achieved when the specific gravity is 1.20 g/cm³,dosage of PAM is 150 mg/L,pH is about 8.Besides,the hydraulic condition could be determined under mix intensity of 300 r/min in 1min then change to 80 r/min in 20 min.The treatment experiments with clay mud indicate that efficient separation of the mud is achieved when the specific gravity is 1.10 g/cm³,dosage of PAM is 150 mg/L,pH is about 6.Besides,the hydraulic condition could be determined under mix intensity of 300 r/min in 1min then change to 80 r/min in 20 min.The treatment process lays a foundation for further treatment of waste slurry.