Aerated grit chamber and method
US6921489B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jul 19, 2002 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Jan 11, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An aerated grit chamber includes an aeration zone in which influent is vigorously aerated and a settling zone separated from the aeration zone by a baffle beneath which wastewater flows from the aeration zone into the settling zone. The aeration causes swirling motion and causes larger grit particles to settle and accumulate in a grit trough on the floor. An inclined plate settler in the upper part of the settling zone causes smaller grit to settle and fall into the grit trough. In order to prevent overly efficient operation at low flow rates and settling of organics with the grit, internal recycling of the wastewater from the settling zone back into the aeration zone is effected, preferably with air lift to induce recycling but also using alternative techniques such as direct pumping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.