| 摘要 |
An anaerobic digester for use in wastewater treatment systems having a fixed cover including a central tower for controlling gas and foam. A constant operating level is maintained in the digester by utilization of an overflow weir located in the tower. The fixed cover having an under flat surface that is in direct contact with contents of the digester. The tower has a number of spray nozzles that operably direct movement of foam toward discharge locations.
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