Comparative PCDD/PCDF-investigations in a MSWI plant before and after the design modernization

Duwel, U; Nottrodt, A; Ballschmiter, Karlheinz

doi:10.1016/0045-6535(91)90166-b

Cited by 5 publications

(1 citation statement)

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“…PCDD/F destruction was also noticed to differ between the different congeners (14), and also shifts in the congeners are possible when flue gases pass by the ESP (15). The combinations of dry scrubber/fabric filter (16), wet scrubber/fabric filter (17,18), or spray absorber/ESP (19) and wet gas scrubbing (20) have also been used successfully to decrease PCDD/F emissions. PCDD/F reduction accompanied with NOx reduction by ammonia injection (21) or ammonia radical injection and by using SCR unit or some other DENOX unit are well-known methods for PCDD/F reduction (22)(23)(24)(25).…”

Section: Introductionmentioning

confidence: 99%

Effect of Gaseous Inhibitors on PCDD/F Formation

Ruokojärvi

Halonen

Tuppurainen

et al. 1998

Environ. Sci. Technol.

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Emissions of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) from municipal waste incineration are currently a subject of considerable public concern because of their extreme toxicity. PCDD/F formation in incineration processes is being studied widely, but studies on inhibition are quite sparse, especially in a pilot-plant scale. In this work, the effect of four gaseous inhibitors (sulfur dioxide, ammonia, dimethylamine, and methyl mercaptan) on PCDD/PCDF formation in the combustion of liquid fuel was studied using a pilot-scale plant. The inhibitors were injected into the flue gas stream after the first economizer at a temperature of 670 °C and just before the second economizer at 410 °C. Both the chlorophenol and PCDD and PCDF concentrations decreased when inhibitors were added. Particle-phase PCDD/F concentrations in particular decreased by up to 98%. The results suggest that the formation of PCDD/Fs is hindered in the particle phase at the early stages of the PCDD/F formation chain, probably even before precursors such as chlorophenols have been formed.

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