| 摘要 |
<p>A sludge digestion tank 2 has three chambers 8, 10 and 12. There are common walls 14 and 16 between the chambers 8 and 10 and the chambers 10 and 12 respectively. Batches of digested sludge are withdrawn at chosen intervals from the chamber 12 through the outlet 20. The chamber 12 is replenished with sludge from chamber 10 and the chamber 10 likewise with sludge from chamber 8. Untreated sludge is passed through inlet 18 into the chamber 8. The sludge in at least one of the chambers is oxygenated, and the chambers 10 and 12 are operated at higher temperatures than the chamber 8 and in the thermophilic temperature range. It is possible using the apparatus to obtain satisfactory residence times for the sludge while obtaining the advantages of thermophilic digestion. <IMAGE></p> |
