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DatoValore
TitleHigh-frequency ultrasound treatment of sludge: combined effect of surfactants removal and floc disintegration
AbstractUltrasounds represent an effective technology in many research fields. In sewage sludge treatment, lowfrequency ultrasound, particularly at 20 kHz, 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 200 kHz 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 1 h. 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 highfrequency ultrasound irradiation resulted effective also in terms of floc disintegration and soluble organic matter release, in particular for energy inputs higher than 30,000 kJ/kg TS. The disrupting effect of the 200 kHz treatment was also evaluated by microscope analyses and determination of the extracellular polymeric substances release in the liquid phase.
SourceUltrasonics sonochemistry (Print) 19, pp. 864–871
Keywordsdecontaminationsludgesonolysis
JournalUltrasonics sonochemistry (Print)
EditorButterworth-Heinemann, Amsterdam, Regno Unito
Year2012
TypeArticolo in rivista
AuthorsGallipoli A., Braguglia C.M.
Text191710 2012 decontamination sludge sonolysis High frequency ultrasound treatment of sludge combined effect of surfactants removal and floc disintegration Gallipoli A., Braguglia C.M. Ultrasounds represent an effective technology in many research fields. In sewage sludge treatment, lowfrequency ultrasound, particularly at 20 kHz, 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 200 kHz 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 1 h. 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 highfrequency ultrasound irradiation resulted effective also in terms of floc disintegration and soluble organic matter release, in particular for energy inputs higher than 30,000 kJ/kg TS. The disrupting effect of the 200 kHz treatment was also evaluated by microscope analyses and determination of the extracellular polymeric substances release in the liquid phase. 19 Published version High frequency ultrasound treatment of sludge Combined effect of surfactants removal and floc disintegration gallipoli_e_braguglia_2012.pdf Articolo in rivista Butterworth Heinemann 1350 4177 Ultrasonics sonochemistry Print Ultrasonics sonochemistry Print Ultrason. sonochemistry Print Ultrasonics sonochemistry. Print agata.gallipoli GALLIPOLI AGATA camillamaria.braguglia BRAGUGLIA CAMILLA MARIA TA.P07.001.005 Recupero di risorse da rifiuti e biomasse