The aeration flotation process is a new application to the activated sludge processes. The finaltank USES dissolved air flotation instead of sedimentation, and is combined with the aeration tank.
曝气气浮池是活性污泥法中的一种新型构筑物，它是以气浮代替沉淀，并与曝气池有机组合而成。
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Discovery was hours from launching on it final voyage to the ISS on November 5 when technicians found a hydrogen leak and later a series of long cracks on the shuttle's external fuel tank.
Discovery's final flight follows several delays due to technical problems and repairs to its external fuel tank, but NASA's mission launch director Mike Leinbach says the shuttle is still space-ready.