Scum removal system for liquid treatment tank
US6126824A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1998 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Oct 15, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.