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contributor authorAkshaykumar Suresh; Ewa Grygolowicz-Pawlak; Leong Soon Poh; Maszenan bin Abdul Majid; Dominik Dominiak; Thomas Vistisen Bugge; Xin Gao; Wun Jern Ng
date accessioned2019-03-10T12:03:55Z
date available2019-03-10T12:03:55Z
date issued2019
identifier other%28ASCE%29EE.1943-7870.0001505.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4254790
description abstractIn 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.
publisherAmerican Society of Civil Engineers
titleEvidence for Resistance of Activated Sludge Flocs to Deflocculative DO Stress
typeJournal Paper
journal volume145
journal issue4
journal titleJournal of Environmental Engineering
identifier doi10.1061/(ASCE)EE.1943-7870.0001505
page04019005
treeJournal of Environmental Engineering:;2019:;Volume ( 145 ):;issue: 004
contenttypeFulltext


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