| 摘要 |
Sewage treatment, 100, involves passing sewage through an anaerobic reaction zone, 12, the organic matter in the sewage being subjected to anaerobic biological degradation; passing the sewage from this zone through another aerobic reaction zone, 18, the organic matter being subjected to aerobic biochemical decomposition; withdrawing a secondary stream, 30, of sewage after the anaerobic zone and before the aerobic zone; passing this secondary stream through a facultative oxidation zone, 32, 33, 34, the organic matter being subjected to aerobic biochemical decomposition; passing at least part of the secondary stream directly to the aerobic zone; optionally, recycling part of the secondary stream to the anaerobic zone. <IMAGE>
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