| 摘要 |
<p>During de-nitrification, the overflow edge (6) of the denitrification tank (2) is held above water level in the aeration tank (1), preventing circulation between them. Between successive denitrification phases, the denitrification tank is flushed, by maintaining the level in the aeration tank above the overflow edge of the denitrification tank. This induces flow as a reduce of density difference, between the aeration tank and the denitrification tank. Preferred features: The denitrification tank, which has closed sides, can move vertically relative to the aeration tank. Denitrification occurs when it is raised, with its overflow edge above the water level (7) in the aeration tank (1). Flushing occurs when it is lowered and the overflow edge is below the water level in the aeration tank. During flushing water flows from above, over the overflow edge and down through the denitrification tank to below. During flushing, more air is blown into the aeration tank than during nitrification. Several denitrification tanks are located in the aeration tank. Flushing of each takes place individually, in succession. The nitrification tank is raised and lowered pneumatically. It has floats which are filled with air for the denitrification phase. During denitrification, the water level in the aeration tank is raised and during flushing of the denitrification tank, it is lowered. An Independent claim is included for corresponding plant.During de-nitrification, the overflow edge (6) of the denitrification tank (2) is held above water level in the aeration tank (1), preventing circulation between them. Between successive denitrification phases, the denitrification tank is flushed, by maintaining the level in the aeration tank above the overflow edge of the denitrification tank. This induces flow as a reduce of density difference, between the aeration tank and the denitrification tank. Preferred features: The denitrification tank, which has closed sides, can move vertically relative to the aeration tank. Denitrification occurs when it is raised, with its overflow edge above the water level (7) in the aeration tank (1). Flushing occurs when it is lowered and the overflow edge is below the water level in the aeration tank. During flushing water flows from above, over the overflow edge and down through the denitrification tank to below. During flushing, more air is blown into the aeration tank than during nitrification. Several denitrification tanks are located in the aeration tank. Flushing of each takes place individually, in succession. The nitrification tank is raised and lowered pneumatically. It has floats which are filled with air for the denitrification phase. During denitrification, the water level in the aeration tank is raised and during flushing of the denitrification tank, it is lowered. An Independent claim is included for corresponding plant.</p> |
