Document Detail

High-frequency ultrasound treatment of sludge: Combined effect of surfactants removal and floc disintegration.
MedLine Citation:
PMID:  22245371     Owner:  NLM     Status:  Publisher    
Ultrasounds represent an effective technology in many research fields. In sewage sludge treatment, low-frequency ultrasound, particularly at 20kHz, are widely used for sludge disintegration before the anaerobic digestion, while in the last years novel application of high-frequency ultrasound regards the decontamination of water and wastewater through sonochemical reactions. The innovative approach presented in this paper is the treatment of sewage sludge with ultrasound at 200kHz for obtaining efficient sludge disintegration and the removal of the linear alkylbenzenesulphonates (LAS) at the same time. Results of the sonolysis experiments showed that native LAS degradation up to 40% can be achieved with low power input in less than 1h. The degradation pattern was different for each LAS homologue (from C10 to C13), because of their physical-chemical properties, in particular as regards the alkyl chain length. This high-frequency ultrasound irradiation resulted effective also in terms of floc disintegration and soluble organic matter release, in particular for energy inputs higher than 30,000kJ/kgTS. The disrupting effect of the 200kHz treatment was also evaluated by microscope analyses and determination of the extracellular polymeric substances release in the liquid phase.
A Gallipoli; C M Braguglia
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-24
Journal Detail:
Title:  Ultrasonics sonochemistry     Volume:  -     ISSN:  1873-2828     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2012-1-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9433356     Medline TA:  Ultrason Sonochem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Water Research Institute, CNR, Area di Ricerca RM1-Montelibretti, Via Salaria km 29.300, 00015 Monterotondo (Roma), Italy.
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