Method for degrading artificial sweeteners from sewage
US9902637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 25, 2016 |
| Grant date | Feb 27, 2018 |
| Priority date | — |
| Expiry date | Dec 25, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2305/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for degrading artificial sweeteners from sewage, the method including: 1) introducing sewage to a secondary sedimentation tank and precipitating sediments; 2) collecting a supernatant from the secondary sedimentation tank, adding a NaOH solution or a perchloric acid solution to regulate the pH; adding an H2O2 solution to the supernatant to adjust a ratio of a molar concentration of H2O2 to a molar concentration of the sweetener in the resulting mixed solution to be between 1:1 and 30:1; transferring the resulting mixed solution to a photoreactor, irradiating the mixed solution by ultraviolet light, and stirring the mixed solution for between 5 and 30 min; and adding a 1.5% w/w aqueous NaNO2 solution to the mixed solution; and 3) collecting and analyzing an effluent obtained from 2), contacting the effluent with ClO2 for reaction in a disinfecting tank, and discharging the product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.