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Assessment of activated sludge stability in lab-scale experiments

Paper ID Volume ID Publish Year Pages File Format Full-Text
24794 43537 2009 8 PDF Available
Title
Assessment of activated sludge stability in lab-scale experiments
Abstract

The majority of activated sludge research is conducted in a laboratory environment with, most often, the start-up sludge being taken from a large-scale wastewater treatment plant. Inoculating this sludge in a lab-scale set-up induces a transient period, which, evidently, has a direct impact on the experimental results during this period of acclimatization. In the currently published literature, the acclimatization period is either neglected or fixed to two or three times the sludge age, without any guarantee that stable conditions are indeed reached. To develop a strategy that assesses the stability of activated sludge, three experiments were performed during which the activated sludge was extensively monitored through a series of physical, microscopic and biochemical analyses. It is demonstrated that it is possible to objectively quantify activated sludge stability through the monitoring of the total averaged filament length per image, the sludge volume index and the maximum specific oxygen uptake rate. Hereto, a moving window approach is adopted: within a 7 days interval the mean slope and the gap between the maximum and minimum value has to be smaller than a pre-specified threshold value. Once stability is reached, the true impact of test conditions can be studied without interference of adaptation phenomena.

Keywords
(s)COD, (soluble) Chemical Oxygen Demand [mgO2/L]; Deq, Equivalent diameter [μm]; DGGE, Denaturing Gradient Gel Electrophoresis; F, Total averaged filament length per image [μm/image]; FF, Form factor; FISH, Fluorescent In Situ Hybridization; MLSS, Mixed
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 141, Issues 3–4, 20 May 2009, Pages 147–154
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us