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1, Summarize
Vertical flow sediment basins and says, is the pool of vertical traps vertical flow sediment basins of the waste water. The plane figure is circular pool body or square, the water in the pool by center in the pool from feed line into (pipe velocity should be less than 30 mm/s), pipe under the umbrella baffle the effluent in the pond and evenly distributed along the whole water section for sewage up slowly (0.5 0.7 mm general/s, precipitation time using 1-1.5 h), suspended solids settlement into the bottom of the pool tapered sink a clear water, mud from around the pool along the surrounding the overflow weir outflow. Weir a baffle scum and before slot to intercept scum ensure outlet water quality. The side of the pool on the wall a row mud tube (more than 200 mm in diameter) by hydrostatic pressure will regularly eduction. Mud Has the cover an area of an area small, row mud easy advantages.
2, Working principle
In vertical flow sediment basins, sewage from down to the vertical flow velocity v do in dirty suspended particles have three kinds of motion:
When u > v particles heavy speed, the particles will with u v the difference between the precipitation, to remove particles down. (2) when u = v, particles in a random state, not sink and not rise.
(3) when u < v, particles will not precipitation down, and will be upward water flow away.