Aerated grit tank
US4670142A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1982 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Sep 30, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03B5/48
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An aerated grit tank is provided having a longitudinally extending control wall dividing the tank into parallel lift and settling chambers. An air discharge apparatus is provided at the bottom of the lift chamber to induce an upward flow of sewage causing a generally helical flow of sewage around the control wall. The control wall is supported in the tank by mechanisms selectively operable to vertically position the wall with a bottom longitudinally extending edge in predetermined spaced relationship to a bottom floor of the tank whereby the velocity of the cross currents may be effectively controlled. One form of the structure has a single control wall unit while a second form of the invention has two wall forming panels with an uppermost panel supported in fixed relationship to the tank and a lowermost panel supported for vertical displacement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.