| 摘要 |
A process for treating sewage sludge or similar organic sludge in which dewatered sludge cake and an alkaline admixture are mixed and then dried under pasteurisation conditions utilising heat from the exothermic reaction with the alkali. The drying is effected by the extraction of moisture evaporated from the mixture by the exothermic heat. The pasteurisation conditions comprise maintaining a pasteurising temperature for less than 10 hours at a pH of at least 12, the pH of the mixture being maintained at 12 or above for less than a day. The pasteurising temperature may be maintained for about 4 hours. Drying may be effected in a FIFO hopper (10, Fig. 1) to dry the product to at least 50%, preferably between 50 and 65%, dry solids content. |
