| 摘要 |
<p>A method of treating sewage sludge comprises a pathogen reduction stage in which raw sludge is incubated for a predetermined incubation period at a temperature in the mesophilic temperature range. The sludge is incubated in a plurality of sequential vessels ( 1 a, 1 b, 1 c) comprising an upstream vessel ( 1 a) which receives the raw sludge to be incubated and a downstream vessel ( 1 c) which discharges the incubated sludge. The sludge is fed from the upstream vessel ( 1 a) to the downstream vessel ( 1 c), via any intermediate vessels ( 1 b), and subsequently discharged after spending a predetermined residence time in each vessel, the total residence time being said predetermined incubation period.</p> |
