Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 286, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2021.112120
Keywords
Sludge management; Heavy metals; Wet oxidation; Thermal hydrolysis; Solubilisation
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Funding
- Employment, Industry and Tourism Office of Principality of Asturias (Spain) [GRUPIN IDI/2018/000127]
- State Research Agency (Spanish Ministry of Science and Innovation) [MCIU-19-RTI2018-094218-B-I00]
- Education and Culture Office of Principality of Asturias (Spain) through the Severo Ochoa pre-doctoral aid programme [BP19-041]
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The study found that high temperature favors metal immobilization, while pressure variations have little effect on metal immobilization; under different atmospheric conditions, the dissolution and immobilization of heavy metals vary.
The present study analyses the combined effects of temperature (from 160 to 200 ?C), and, for the first time ever, type of atmosphere (oxidising or inert) and pressure (from 60 to 100 bar) on the solubilisation of heavy metals during the hydrothermal treatment of wet no-diluted sewage sludge. Results revealed that Cd, Pb, Al and Fe were hardly affected by neither the atmosphere nor temperature, remained almost completely in the solid phase during all the hydrothermal treatments tested; while Cr, Ni, Cu and Zn were partially solubilised, being this solubilisation favoured by the presence of an oxidising atmosphere. In contrast, initial dissolved Hg was partially precipitated under both types of atmosphere, although it was re-dissolved after 30 min under an inert atmosphere. Regarding the working conditions, the highest temperature (200 ?C) caused the greatest metal immobilisation, whereas the range of pressures tested barely had any effect on it. Concerning the reaction time, the lowest concentration of metals in the liquid fraction of the hydrolysed sludge was obtained during the initial 30 min of treatment.
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