Application of Air Floatation/Air-water Backwashing Filter in Tianjin Jieyuan Water Treatment Plant

In order to ensure the quality of supply water under the high algae-laden situation,the fourth technical reconstruction was performed in Tianjin Jieyuan Water Treatment Plant.The tube settler and biflow filter were removed,the horizontal sedimentation tank,rapid filter and double-valve filter were kept,and a new comprehensive clean room including intake chamber,mechanical flocculator,floatation tank,air-water backwashing filter,chemical addition chamber,lime chamber,backwashing drainage tank,control room for power transformation and distribution and other structures was constructed on the east part of this plant.After the reconstruction,the plant has a water supply capacity of 50×104 m3/d,and the effluent turbidity is 0.5 NTU.