Study of the memory effect of PCDD/F during the combustion of several biomasses in a moving grate boiler

The objective of this work was to study the influence of temperature on the PCDD/Fs behavior stored in biomass ashes issued from an automatic pilot-scale wood boiler. A mixture of these ashes with a dioxin mass ratio dry based of 5.9 μg kg −1 was used for thermal treatment at temperatures ranging be...

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Bibliographic Details
Published in:Environmental science and pollution research international 2022-10, Vol.29 (48), p.72639-72654
Main Authors: Baraket, Nada, Brandelet, Benoît, Trouvé, Gwenaëlle, Rogaume, Yann
Format: Article
Language:English
Subjects:
Aquatic Pollution
Ashes
Atmospheric Protection/Air Quality Control/Air Pollution
Automatic pilots
biomass
Boilers
combustion
Dioxins
Earth and Environmental Science
Ecotoxicology
Engineering Sciences
Environment
Environmental Chemistry
Environmental Health
Environmental science
Heat treatment
Polychlorinated dibenzodioxins
Reactors
Research Article
Scale (corrosion)
Shutdowns
temperature
Thermogravimetric analysis
thermogravimetry
Waste Water Technology
Water Management
Water Pollution Control
wood
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Summary:The objective of this work was to study the influence of temperature on the PCDD/Fs behavior stored in biomass ashes issued from an automatic pilot-scale wood boiler. A mixture of these ashes with a dioxin mass ratio dry based of 5.9 μg kg −1 was used for thermal treatment at temperatures ranging between 200 and 500°C. First tests were carried out in a macro thermogravimetric analysis instrument while a couple of other tests were carried out in a quartz-lined crossed fixed-bed reactor. These treated ashes were afterwards analyzed and their dioxin mass ratio was determined. Results obtained from these both experiments are radically different: ashes treated in macro-TGA contain 18 times more PCDD/Fs than the initial non-treated ashes while those from the reactor have 84% less of PCDD/Fs. Ninety-one percent of stored PCDD/Fs in the initial ashes were eliminated after 1h at 400°C in crossed fixed-bed reactor. Macro-TGA experiments are a representation of what happens during the shutdown and cooling phase of the boiler, some areas reaching temperatures for which the formation of PCDD/Fs is optimal. Without cleaning the boiler, a memory effect on further tests is observed.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-022-20774-1