| 摘要 |
PCT No. PCT/EP89/00212 Sec. 371 Date Sep. 7, 1990 Sec. 102(e) Date Sep. 7, 1990 PCT Filed Mar. 2, 1989 PCT Pub. No. WO89/08616 PCT Pub. Date Sep. 21, 1989.The urban waste is crushed (2) to dimensions no greater than 5 cm and intimately mixed (5) with a aqueous suspension of biological sludge preconditioned at a temperature of from 40 to 100 DEG C. (6) and having a dry content of from 3 to 30% by weight, the suspension thus obtained, inoculated with bacterial strains (7) which can effect anaerobic break-down, being supplied to a closed fermentation cell (11, 12, 13) operated as a fluidised bed and being kept under anaerobic fermentation conditions in the cell until the emission of biogas has effectively ceased. In the fermentation cell the suspension percolates through filtration means constituted by a non-woven textile covering the walls and the base of the cell and the flow of percolated suspension is recycled to the cell. The filtration means also facilitate the separation of the biogas evolved. |
