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Realistic Sludge Production for Activated Sludge Plants without Primary Clarifiers

James R. Schultz, Bob A. Hegg and Kerwin L. Rakness
Journal (Water Pollution Control Federation)
Vol. 54, No. 10 (Oct., 1982), pp. 1355-1360
Stable URL: http://www.jstor.org/stable/25041708
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Realistic Sludge Production for Activated Sludge Plants without Primary Clarifiers
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Abstract

After evaluating nearly 200 wastewater treatment plants in the U. S., the authors found inadequate sludge handling facilities to be one of the most common and critical performance-limiting problems. In this paper actual sludge production data for over 1 000 operating weeks in 16 plants provide an incentive and basis for designing good sludge handling facilities for activated sludge plants without primary clarifiers. Results show overall sludge production in well-performing plants was significantly greater than values commonly used for design. Total sludge production typically averaged 0.4 kg total suspended solids per kg biochemical oxygen demand (0.8 to 1.0 lb/lb) removed and varied considerably from month to month in an individual plant. Long aeration detention times, low F/M ratios, and high sludge ages did not substantially reduce sludge production.

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