| 摘要 |
Anaerobic treatment of sewage and any other solids optionally added includes comminuting and homogenizing the sewage and any other solid matter and then passing it upwardly through a biological sand contact bed 14 in a container 4 at a temperature above 40 DEG C to purify the sewage and solids and form sewage gas, after which at least a portion of the purified sewage is recirculated through indirect heat exchanger 2 to preheat untreated sewage passing through the heat exchanger 2 prior to treatment thereof in the container 4. <IMAGE> |
