Wastewater pretreatment method and sewage treatment method using the pretreament method
US9169143B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 1, 2010 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Aug 10, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/20
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A pretreatment method is provided, which comprises the following steps: (1) wastewater feed is introduced into a first end of a first aeration basin, and is mixed with a first concentrated mixed liquor to obtain a first mixed liquor; (2) the first mixed liquor is aerated in the aeration stage of the first aeration basin to obtain a second mixed liquor at a second end of the first aeration basin; (3) the second mixed liquor is introduced into a first sedimentation basin to obtain a supernatant and the first concentrated mixed liquor; (4) the supernatant is discharged and at least a part of the first concentrated mixed liquor is returned to the first end of the first aeration basin. At the same time, a sewage treatment method using the wastewater pretreatment method is provided. The pretreatment method can be used steadily for a long time without discharging sludge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.