Trickling Filter-Activated Sludge Combinations

by Robert F. Roskopf, (M.ASCE), San. Engr.; Rieke Carroll Muller Assocs., Inc., Hopkins, Minn.,
E. Robert Baumann, (F.ASCE), Prof.; Dept. of Civ. Engrg. and Engrg. Research Inst., Iowa State Univ., Ames, Iowa,
James C. Young, (M.ASCE), Assoc. Prof.; Dept. of Civ. Engrg. and Engrg. Research Inst., Iowa State Univ., Ames, Iowa,


Serial Information: Journal of the Environmental Engineering Division, 1976, Vol. 102, Issue 5, Pg. 1005-1018


Document Type: Journal Paper

Abstract: Activated sludge processes were used on a pilot-plant scale as a means of upgrading trickling filter plants treating domestic wastewater. Parallel use of units provided increased hydraulic capacity and produced effluent BOD concentrations consistently below 25 mg/l. Series activated sludge-trickling filter or trickling filter-activated sludge processes produced effluent BOD consistently below l5 mg/l. This performance was maintained in all cases when operating at organic loadings up to about 50 lb BOD/day/1,000 cu ft (0.80 kg/day/m³) of treatment unit volume.

Subject Headings: Filters | Activated sludge | Wastewater treatment plants | Effluents | Industrial wastes | Municipal wastewater | Hydraulics

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