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Title: Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments
Author: Ruiz-Hernando, Maria
Martinez-Elorza, Guillermo
Labanda, Jordi
Llorens Llacuna, Joan
Keywords: Llots de depuradora
Tractament tèrmic
Sewage sludge
Heat treatment
Issue Date: 2013
Publisher: Elsevier B.V.
Abstract: Sludges resulting from wastewater treatment processes have a characteristically high water content, which complicates handling operations such as pumping, transport and disposal. To enhance the dewatering of secondary sludge, the effect of ultrasound waves, thermal treatment and chemical conditioning with NaOH have been studied. Two features of treated sludges were examined: their rheological behavior and their dewaterability. The rheological tests consisted of recording shear stress when the shear rate increases and decreases continuously and linearly with time, and when it increases and decreases in steps. Steady-state viscosity and thixotropy were obtained from the rheological tests, and both decreased significantly in all cases with increased treatment intensity. Centrifugation of ultrasonicated and thermally treated sludges allowed the total solid content to be increased by approximately 16.2% and 17.6%, respectively. These dewatered sludges had a lower viscosity and thixotropy than the untreated sludge. In contrast, alkali conditioning barely allowed the sludge to be dewatered by centrifugation, despite decreasing its viscosity and thixotropy.
Note: Versió postprint del document publicat a:
It is part of: Chemical Engineering Journal, 2013, vol. 230, p. 102-110
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ISSN: 1385-8947
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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