| 摘要 |
A method for treating sludge comprises: (i) heating the sludge, for a predetermined amount of time, to a temperature sufficient to enable hydrolysis of the sludge to begin; (ii) heating the sludge, for a second predetermined period of time, to increase the temperature and enable pasteurisation of the sludge to occur; and (iii) allowing the temperature of the sludge to decrease and holding the sludge at the decreased temperature for a third predetermined period of time, to enable further hydrolysis of the sludge to occur. Preferably, the temperature in steps (i) and (iii) is from 30 to 52°C, whilst the temperature in step (ii) can be greater than 55 °C. The predetermined amount of time in steps (i) and (ii) may be from 12 to 24 hours, whilst the predetermined amount of time in step (iii) is suitably from 2 to 4 days. |
