Method and apparatus for removing grit
US4107038A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1977 |
| Grant date | Aug 15, 1978 |
| Priority date | — |
| Expiry date | Aug 12, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D21/2411
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Grit is removed from liquid sewage by flowing such sewage into a settling chamber and causing the sewage to flow in a toroidal pattern around the periphery of the chamber. Grit falls to the floor of the settling chamber and passes radially to and then through a central opening into a grit collection chamber therebeneath. Organic solids are kept in motion in the toroidal flow pattern, or lifted from the settling chamber floor into such flow pattern, and are discharged through an outlet adjacent the upper surface of the liquid in the settling chamber. Toroidal flow is created and maintained by obstructing the tangential flow path of incoming sewage with a baffle which blocks the tangential inlet and has an edge extending above the upper surface of the liquid. A propeller rotating about a vertical axis in the center of the chamber is adjustable so as to keep the contents of the chamber impinging against the baffle as they flow around the tank in the toroidal pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.