| 摘要 |
<p>A reed bed system comprises an inlet tank 5 fed by inlet pipe 15 and distributing waste water to reed-bed(s) 1-4 via inlet conduits 6-9. The beds are periodically flooded (tidal flow system) and allowed to drain via drain conduits 11-14 into drain tank 10 and out through outlet pipe 16. Inlet tank 5 is sectioned into an inlet chamber 20 and filling chambers 21 and (22-24). Filling chamber 21 has a connector duct 25 which is articulated 33 about one end and has a float 29 proximate the free end. In its first horizontal position duct 25 allows waste-water to flow from chamber 20 through inlet conduit 6 to reed-bed 1. Filling the reed bed causes the duct to lift (via float 29) to its second elevated position where it is retained on wheel 50 via peg 45a. In this position, further water flow through the duct is prevented. Wheel 50 is continuously rotating and will retain peg 45a for ² of a revolution. During this time, reed-bed 1 is allowed to drain. For the final revolution, peg 45a is released, allowing the duct to drop back to its horizontal position and cause the reed-bed to refill. A similar mechanism is present for filling chambers (22-24), all of which use a common wheel and are therefore filled and emptied cyclically. A similar float and conduit mechanism is present in drain tank 10 to regulate water flow out of the reed-beds.</p> |
