Use of fly ash to treat spent liquor from a thermomechanical pulping process
US9702083B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Dec 21, 2015 |
| Grant date | Jul 11, 2017 |
| Priority date | — |
| Expiry date | Dec 21, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S162/08
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The spent liquor (SL) of a thermomechanical pulping (TMP) process introduces a high load to the wastewater system of this process. To reduce this load, fly ash from a biomass boiler is used for removing lignin from the SL, and also for decreasing the chemical oxidation demand (COD) and turbidity of the SL.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.