B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 21/24 (2006.01)
Patent
CA 2250552
A scum removal system for a sewage treatment or clarification tank having a feedwell or skimmer flight includes a scum trough disposed within the settling tank. A floating weir is disposed proximate to the scum trough. A membrane or sheet is partially wrapped or wound about the weir, at least one cable being connected to the membrane for pulling the membrane and concomitantly lowering the weir entrained therewith to permit surface scum to enter the trough from the settling tank. A mechanism for exerting increased tension on the cable to thereby lower the weir below the surface of the liquid in the clarification tank includes a camming lever or arm and an actuator. The lever is connected to the cable, while the actuator is mounted to the feedwell or a skimmer wiper arm so as to engage the camming lever and pivot the actuator lever about an axis. The pivoting of the actuator lever increases tension on the cable and causes the cable to pull the floating weir down in opposition to buoyancy forces tending to drive the weir upwards.
Cette invention concerne un dispositif d'évacuation du chapeau de boue dans un bassin de clarification ou de traitement des eaux usées. Il comporte un organe d'évacuation ou bras écumeur destiné à pousser la boue vers un caniveau d'évacuation à proximité duquel se trouve un déversoir flottant. Une membrane enroulée en partie autour du déversoir sert à immerger celui-ci au moyen d'au moins un câble et permettre ainsi au chapeau de boue de passer dans le caniveau d'évacuation. Le mécanisme tendeur des câbles d'immersion du déversoir comprend un levier ou bras à came et un actionneur. Le levier est raccordé au câble tandis que l'actionneur est monté sur l'organe d'évacuation ou bras écumeur de façon à entrer en contact avec le levier à came et pivoter autour d'un axe. Le pivotement de l'actionneur a pour effet de tendre le câble et d'immerger le déversoir flottant qui tend à surnager en raison de sa flottabilité naturelle.
Bsumek Peter J.
Hanford Robert E.
Stewart Bill C.
Baker Hughes Incorporated
Gowling Lafleur Henderson Llp
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