Flow and Load Variations in Treatment Plant Design

by James C. Young, (M.ASCE), Prof. of Civ. Engrg.; Iowa State Univ., Ames, Iowa,
E. Robert Baumann, (M.ASCE), Anson Marston Distinguished Prof. of Engrg.; Iowa State Univ., Ames, Iowa,
John L. Cleasby, (M.ASCE), Prof. of Civ. Engrg.; Iowa State Univ., Ames, Iowa,

Serial Information: Journal of the Environmental Engineering Division, 1978, Vol. 104, Issue 2, Pg. 289-303

Document Type: Journal Paper


A major problem in designing water pollution control plants is sizing units to have adequate capacity to treat peak flow rates and waste loads without process failure or significant loss in performance. A case study of a midwest city is used as a basis for determining peak-to-average wastewater flow and load ratios. These peaking ratios provided a basis for making various recommendations for designing specific treatment units for activated sludge plants. The peaking considerations covered should apply to design of plants for any size city although specific ratios should be developed from local records.

Subject Headings: Load and resistance factor design | Water pollution | Load bearing capacity | Failure loads | Case studies | Urban areas | Hydraulic design | Water treatment plants

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