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Determination of the Required Surface Area of a Final Clarifier for an Activated‐Sludge System
Author(s) -
Yuen Weng Ah
Publication year - 2004
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143004x141717
Subject(s) - clarifier , flux (metallurgy) , activated sludge , environmental science , thickening , environmental engineering , control theory (sociology) , process engineering , engineering , computer science , materials science , wastewater , pulp and paper industry , control (management) , artificial intelligence , metallurgy
A generic methodology for determining the required surface area of a final clarifier is presented. Clarification and thickening requirements are integrated to form a unified procedure for final clarifier design. The new method is based on results obtained by Yuen (2002) on the solids flux theory for a secondary clarifier; it does not require the specification of recycle rate, which is computed as an output of the method. The author shows that there is a minimum required surface area ( A m ) for a final clarifier under the thickening requirement when the designed recycle rate is set at the maximum allowable value (F R ) m (at the critical state). The designed surface area and the return activated sludge pumping capacity can be determined by applying a safety factor to A m and (F R ) m , respectively. The method is shown to conform to conventional design criteria under typical design conditions.