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Deep-bed down-flow two-media filters were used in pilot plant studies with filtration of secondary settled wastewater. FeSO 4 or FeCl 5 was applied as a precipitation agent, and NaAc.3H 2 O was chosen as a carbon source when denitrification was desired. The concentration of PO 4 -P in the filtrate from the pilot plant study never exceeded 0.05 mg PO 4 -P/l...
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