Clay-sewage sludge co-pyrolysis. A TG-MS and Py-GC study on potential advantages afforded by the presence of clay in the pyrolysis of wastewater sewage sludge

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2010.05.027· OSTI ID:21541761

Ischia, Marco ^[1]; Maschio, Roberto Dal ^[1]; Grigiante, Maurizio ^[2]; Baratieri, Marco ^[3]

---

1. Department of Materials Engineering and Industrial Technologies, University of Trento, via Mesiano 77, 38100 Trento (Italy)
2. Department of Civil and Environmental Engineering, University of Trento, via Mesiano 77, 38100 Trento (Italy)
3. Faculty of Science and Technology, Free University of Bolzano, Piazza Universita 5, 39100 Bolzano (Italy)

Wastewater sewage sludge was co-pyrolyzed with a well characterized clay sample, in order to evaluate possible advantages in the thermal disposal process of solid waste. Characterization of the co-pyrolysis process was carried out both by thermogravimetric-mass spectrometric (TG-MS) analysis, and by reactor tests, using a lab-scale batch reactor equipped with a gas chromatograph for analysis of the evolved gas phase (Py-GC). Due to the presence of clay, two main effects were observed in the instrumental characterization of the process. Firstly, the clay surface catalyzed the pyrolysis reaction of the sludge, and secondly, the release of water from the clay, at temperatures of approx. 450-500 deg. C, enhanced gasification of part of carbon residue of the organic component of sludge following pyrolysis. Moreover, the solid residue remaining after pyrolysis process, composed of the inorganic component of sludge blended with clay, is characterized by good features for possible disposal by vitrification, yielding a vitreous matrix that immobilizes the hazardous heavy metals present in the sludge.

• OSTI ID: 21541761
• Journal Information: Waste Management, Vol. 31, Issue 1; Other Information: DOI: 10.1016/j.wasman.2010.05.027; PII: S0956-053X(10)00316-8; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CARBON
CLAYS
GAS CHROMATOGRAPHY
GASIFICATION
HEAVY METALS
MASS SPECTROSCOPY
PYROLYSIS
RESIDUES
SEWAGE SLUDGE
SOLID WASTES
THERMAL GRAVIMETRIC ANALYSIS
VITRIFICATION
WASTE WATER
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMATOGRAPHY
DECOMPOSITION
ELEMENTS
GRAVIMETRIC ANALYSIS
HYDROGEN COMPOUNDS
LIQUID WASTES
MATERIALS
METALS
MINERALS
NONMETALS
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SEWAGE
SILICATE MINERALS
SLUDGES
SPECTROSCOPY
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
WASTES
WATER