This paper analyses them and improves the utilizing conditions of the oblique-flow precipitating tank with lead-zinc smelting sewage treatment engineering.

Analysis for shortcomings of oblique flow precipitation poolin waste water treatment;

Based on k-ε two equation turbulent model, FLUENT, a large computer fluid mechanics software, was used to numerically simulate the flow pattern in baffled sedimentation tank with return ratio of zero and 75%, the serious short-circuiting current and bigger dead zone were observed.

Numerical simulation for rectangular settling tanks;

Due to its simple structures, convenient management, low operating costs and strong adaptabilities to the changeable water quality, the rectangular settling tanks are still widely used in kinds of water and wastewater treatment.

Back propagation(BP) neural network was adopted to fit the known horizontal sedimentation tank construction cost with the calculation surface area(S) and volume(V) of the tank as input data.

The optimal designs of horizontal sedimentation tanks and plated upflow sedimentation tanks are made when sedimentation data is provided or not.