| 摘要 |
Water in an aeration pond is treated with substantially pure oxygen. The oxygen originates from a pressurized oxygen supply, and is conducted through a conduit to the bottom of the pond. Perforations located around the perimeter and along the length of the conduit allow oxygen to bubble through the pond. A hood disposed to float above the surface of the pond collects unreacted oxygen, and this oxygen flows, through a suitable gas line, back to the original conduit. The unreacted oxygen mixes with fresh oxygen from the pressurized source, and is recycled through the pond. In one embodiment, before mixing with fresh oxygen, the recovered oxygen is pressurized by a double-diaphragm pump which is operated by pressure from the oxygen supply. The pressurized oxygen is the sole source of motive force for moving gas through the system. The rate of gas flow through the system is controlled by adjusting the supply pressure, through the use of a control valve. The present invention substantially improves the efficiency of water treatment processes, by dramatically reducing the amount of wasted oxygen.
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