Predicting the drying properties of sludge based on hydrothermal treatment under subcritical conditions

Water Research
Mikko MäkeläAndrés Fullana

Abstract

The effects of hydrothermal treatment on the drying properties of sludge were determined. Sludge was hydrothermally treated at 180-260 °C for 0.5-5 h using NaOH and HCl as additives to influence reaction conditions. Untreated sludge and attained hydrochar samples were then dried under identical conditions with a laboratory microdryer and an X-ray microtomograph was used to follow changes in sample dimensions. The effective moisture diffusivities of sludge and hydrochar samples were determined and the effect of process conditions on respective mean diffusivities evaluated using multiple linear regression. Based on the results the drying time of untreated sludge decreased from approximately 80 min to 37-59 min for sludge hydrochar. Drying of untreated sludge was governed by the falling rate period where drying flux decreased continuously as a function of sludge moisture content due to heat and mass transfer limitations and sample shrinkage. Hydrothermal treatment increased the drying flux of sludge hydrochar and decreased the effect of internal heat and mass transfer limitations and sample shrinkage especially at higher treatment temperatures. The determined effective moisture diffusivities of sludge and hydrochar increased as a ...Continue Reading

References

May 17, 2006·Water Research·Talat Mahmood, Allan Elliott
Dec 22, 2009·Chemical Society Reviews·Maria-Magdalena Titirici, Markus Antonietti
Mar 18, 2011·Bioresource Technology·Joan G LynamVictor R Vasquez
Jun 16, 2011·Environmental Science & Technology·Nicole D BergeSunyoung Bae
May 28, 2013·Current Opinion in Chemical Biology·Andrea KruseMaria-Magdalena Titirici
Jan 9, 2014·Bioresource Technology·Xiaowei LuNicole D Berge

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