Flocculation and Sedimentation Test of Abandoned Slurry in Shield Tunnel and Evaluation of Treatment Effect
In order to clarify the solid-liquid separation performance of abandoned slurry in shield tunnels and improve separation efficiency,non-ionic polyacrylamide,anionic polyacrylamide,and polyaluminum chloride are selected to study the flocculation and precipitation effects of different molecular weights,concentrations,and addition amounts in this experiment.Based on the experimental results of a single flocculant,a composite flocculant is further selected for experimental research.The results show that the order of flocculation effect from strong to weak is anionic polyacrylamide＞nonionic polyacrylamide＞polyaluminum chloride,among them,the flocculation and precipitation effect of anionic polyacrylamide is much better than that of nonionic polyacrylamide and polyaluminum chloride,and the mud-water separation speed of organic flocculant polyaluminum chloride is slower than the other two coagulants,but the turbidity of the supernatant is much lower than that of inorganic polymer flocculants.Comparative analysis finds that when the addition of composite flocculant anionic polyacrylamide is 70 mL and the addition of polyaluminum chloride is 10 mL,the sediment volume is relatively small,and the turbidity of the supernatant is greatly reduced,meeting the requirements of green and efficient treatment.
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