Research and system development of a new on-line recycled water clean-up technology

Most of the industrial recycled water is of the open system, very easy to produce a lot of sludge. In view of this fact and taking full account of the impact that the adhesiveness, sedimentation rate, density and mobility of the sludge have on the hydrodynamics of the sludge, this study designed some key devices such as the clear mud spray sweeping machine and the sludge absorption tube and followed the stir-separation principle to achieve the clean-up of the sedimentation tank. The rationality of developing the industrial recycled water clean-up system was verified by theoretical analysis and numerical simulation (CFD) and the method to test "3D" research problems in the laboratory PIV flow field. In order to ensure the accuracy of the verification, the numerical simulation and PIV experimental model were designed at the ratio of 1:1. The study shows that when the number of selected sludge absorption tubes is twice that of the clear mud spray sweeping machines with the nozzle spacing of 200mm, the stir is the most ideal as it is able to stratify the fluid in the tank and makes it possible to clean up the mud through the filters. At this time, the vortex of the flow field produced by the jet purger is in the jet direction and the flow field occurs at the 2/3 of the distance between the outlet of the purger and the inlet of the absorption tube, which ensures the level of clear water at the upper layer of the sedimentation tank, meeting the demand for industrial water.