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Title: Evidence for resistance of activated sludge flocs to deflocculative DO stress
Authors: Suresh, Akshaykumar
Grygolowicz-Pawlak, Ewa
Poh, Leong Soon
Maszenan Abdul Majid
Dominiak, Dominik
Bugge, Thomas Vistisen
Gao, Xin
Ng, Wun Jern
Keywords: Engineering::Environmental engineering
Issue Date: 2019
Source: Suresh, A., Grygolowicz-Pawlak, E., Poh, L. S., Maszenan Abdul Majid, Dominiak, D., Bugge, T. V., Gao, X. & Ng, W. J. (2019). Evidence for resistance of activated sludge flocs to deflocculative DO stress. Journal of Environmental Engineering, 145(4), 04019005-.
Journal: Journal of Environmental Engineering
Abstract: In the published literature, deflocculation of aerobic biological flocs under low dissolved oxygen (DO) (< 0.5  mg/L) conditions is typically reported as occurring as early as after 1 h of oxygen deficiency. However, results of this study involving aerobic sludge from three different sources repeatedly indicated a lack of deflocculation after 24 h of low DO conditions. This finding has led to the conclusion that low DO might not be a direct cause of deflocculation. In addition to the low DO conditions, the sludge samples were not re-fed throughout the experiment, but deflocculation was still not observed. An analysis of the soluble microbial products (SMP) and loosely and tightly bound extracellular polymeric substances (EPS) was performed to improve understanding of the sludge’s behavior in response to low DO conditions. Results indicated no increase in SMP content or change in the tightly bound EPS content upon extended periods of low DO. It was concluded that high proteins concentration in the bound EPS improved flocs stability, and so contributed to the maintenance of floc integrity during extended periods of low DO conditions.
ISSN: 0733-9372
DOI: 10.1061/(ASCE)EE.1943-7870.0001505
Rights: © 2019 American Society of Civil Engineers. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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