Tube clarifier in sewage effluent treatment plants - using a settling pipe channel with airlocks

摘要

Sewage from a main treatment pond is fec into a settling conduit, the discharge end of which is sealed off by an air lock. A discharge tube is sealed off by a second airlock situated airlock situated between the entrance end of the discharge conduit and the first airlock. Solids are allowed to settle in the conduit, the second airlock released, and clarified effluent withdrawn from the conduit through the discharge tube and replaced with unclarified effluent at a such a rate that the required clarification takes place during the residence time before the effluent reaches the second airlock. Clarified effluent is withdrawn until such time as the settled solids have accumulated to a point where purging is required, after which the second airlock is est. As a tube clarifier in sewage effluent treatment plants. System eliminates all mechanical valving and gating in contact with the effluent, and scoured solids are returned to the treatment pond.