| 摘要 |
<p>A sewage treatment plant 1 comprises a first settlement chamber 8, an aerobic treatment chamber 14 and a second settlement chamber 15, the treatment chamber 14 having aeration means 25 and mobile media which support microorganisms and are lifted in use by an upward flow within the chamber, the second settlement chamber 15 receiving liquid from the treatment chamber 14 through an opening 16 which connects the bases of these chambers. Preferably the second settlement chamber has an air-lift pump 27 which periodically transfers sludge back to the first chamber 8 and/or the treatment chamber 14. Preferably the treatment chamber and second settlement chamber are separated by a sloping wall 13. The mobile media may consist of plastic beads.</p> |
