Integrated system for the dehydration and consolidation of dredged silt from Wolong Lake: design, performance and low-carbon potential.

With rapid societal development, the pollution of urban rivers and lakes is becoming increasingly serious. Dredging and desilting projects are an important measure in river and lake management. Against the background of the ecological restoration of shallow lakes in northern plains, this study developed an integrated dehydration and consolidation equipment for dredged silt, targeting its application potential in cold regions. The results showed that the dehydration effect of polyacrylamide was significantly better than that of other dehydrating agents in a single dehydration experiment, and the agent did not exhibit an obvious inhibitory effect on quicklime or Portland cement. The test block consolidation strength reached 0.3 MPa, meeting the requirements for general roadbed backfill soil. The optimal ratio of dehydration and consolidation agents was 5% cement, 10% calcium oxide, 1% polyacrylamide, and 120% moisture content of the dredged silt. An integrated tubular pneumatic mixing, transmission, dehydration, and consolidation equipment was set up. The unconfined compressive strength of the test block was 0.38 MPa, and the strength ratio coefficient between the measured strength and the ratio test was 0.75. A computational fluid dynamics simulation was carried out on the test device, using the Euler-Lagrange model, and the boundary conditions were determined. The difference between the simulation and test results was less than 5%, verifying the reliability of the test device and the validity of the simulation analysis method. The structure and boundary conditions of the test device were optimized. The overall equipment is simple to operate, has low technical requirements, and is convenient and reliable.