Process for recovering forest product plant wastes
Abstract
Abstract A PROCESS FOR THE CLOSED-CIRCUIT PROCESSING OF ALL WASTE PRODUCTS FROM FOREST PRODUCT PLANTS, WITHOUT AIT OR WATER POLLUTION. SOLID WASTES, TYPICALLY BARK, WOOD CHIPS, SAWDUST OR THE LIKE, ARE CARBONIZED TO A CHAR. THE CHAR IS AT LEAST IN PART TREATED IN A SECOND FURNACE TO PRODUCE ACTIVATED CARBON, CHAR NOT SO TREATED BEING BRIQUETTED AND SOLD. THE ACTIVATED CARBON IS USED AS A FUILTER MEDIUM FOR PLANT EFFLUENT LIUORS, WHICH CAN BE RECYCLED AFTER SOLIDS REMOVAL. THE CARBON AND ENTRAINED SOLIDS ARE RETURNED TO ONE OF THE FURNACES. OFF-GAS FROM ALL FURNACES IS PASSED TO A BOILER FOR STEAM GENERATION, THE SPENT GAS BEING PASSED THROUGH AN ABSORBER,IF NECESSARY, BEFORE RELEASE.
Inventors
- 👤 R Thompson
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |