Behavior of chromium, nickel, copper, zinc, cadmium, mercury, and lead during the pyrolysis of sewage sludge

Samples of dried sewage sludge (raw sludge and anaerobically stabilized sludge) were pyrolysed at 350, 505, or 750C under anoxic conditions. In all experiments, chromium, nickel, copper, zinc and lead were completely retained in the solid residue. Cadmium was retained in the solid residue at a pyrol...

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Bibliographic Details
Published in:Environmental science & technology 1987-07, Vol.21 (7), p.704-708
Main Authors: Kistler, Rainer C, Widmer, Fritz, Brunner, Paul H
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Other industrial wastes. Sewage sludge
Pollution
Wastes
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Summary:Samples of dried sewage sludge (raw sludge and anaerobically stabilized sludge) were pyrolysed at 350, 505, or 750C under anoxic conditions. In all experiments, chromium, nickel, copper, zinc and lead were completely retained in the solid residue. Cadmium was retained in the solid residue at a pyrolysis temperature of 505C, but was transferred to the off-gas at 750C. Mercury was volatilized at all pyrolysis temperatures. Metals contained in the solid char were resistant to acid leaching (water acidified to pH 3.2 using hydrochloric acid). It was concluded that temperatures of 500-600C were best suited for pyrolysis of sewage sludge, and that the solid residue could be safely disposed of in an inorganic sanitary landfill.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00161a012