| 摘要 |
A method of and apparatus for treating a liquid containing contaminating solid or dissolved solid materials comprising introducing the liquid into a treatment vessel in the lower part of a generally-conical interior portion thereof, causing said liquid to move upwardly with helical flow through said generally-conical interior portion toward said upper end thereof, the path of said helical flow gradually widening as it progresses upwardly through said generally-conical interior portion thereby resulting in separation of solids from the liquid, gradually decreasing the velocity of said liquid by the gradual widening of said helical flow path as it progresses upwardly to form a rotating sludge blanket of separated solids in the upper part of said generally-conical interior portion above the point of liquid introduction, passing the liquid upwardly through said rotating sludge blanket to clarify said liquid while said liquid is moving along said helical flow path, removing the clarified liquid from said treatment vessel at a location above the level of said rotating sludge blanket, maintaining a central quiescent zone in said treatment vessel at about the mouth of a sludge removal downcomer located at about the position of said rotating sludge blanket, and withdrawing sludge from the rotating sludge blanket through the downcomer mouth.
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