Waste activated sludge hydrolysis during ultrasonication: Two-step disintegration

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In order to clearly describe the hydrolysis of waste activated sludge (WAS) during ultrasonication by a 2-step disintegration process, concentrations of ribonucleic acid (RNA) and bound extracellular polymeric substance (EPS) were measured. Apparently, different decreasing patterns of RNA and EPS concentrations during WAS hydrolysis made it possible to distinguish the floc disintegration (FD) and cell lysis (CL). Initially, FD and CL appear to take simultaneously, but the dominant hydrolytic process is shifted from FD to CL after 10 min of ultrasonication. Additional kinetic analysis of WAS hydrolysis was also conducted. A five-fold greater hydrolysis rate constant of FD relative to that of CL was observed, reflecting the different strengths of floc and cells. Therefore, different rates of increased solubilization during WAS hydrolysis appear to account for the initial disintegration of the rather loose part (sludge floc) and the subsequent disintegration of the rigid part (microbial cells). (C) 2012 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2012-10
Language
English
Article Type
Article
Keywords

ANAEROBIC-DIGESTION; BIOMASS; CARBON; WATER; FLOC

Citation

BIORESOURCE TECHNOLOGY, v.121, pp.480 - 483

ISSN
0960-8524
DOI
10.1016/j.biortech.2012.07.024
URI
http://hdl.handle.net/10203/102268
Appears in Collection
CE-Journal Papers(저널논문)
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