Method for removing phosphorus
US8216476B2 · kind B2 · utility
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3References
20Claims
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Key dates
| Filing date | Dec 31, 2009 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | May 2, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/907
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for removing phosphorus includes at least the steps of: 1) placing lanthanum oxide hydrate (absorbent) into a device for removing phosphorus, and allowing sewage having a phosphorus content of less than 100 mg/L to flow through the device; 2) adding sodium hydroxide (regeneration solution of the absorbent) when the absorption capacity of the device is exhausted, and allowing the regeneration reaction to proceed for between 4 and 12 hours; and 3) collecting eluate from step 2) and recycling phosphorus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.