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Related Experiment Video

Updated: Mar 28, 2026

Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization
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High temperature suppression of dioxins.

Ming-Xiu Zhan1, Tong Chen1, Jian-Ying Fu2

  • 1State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, PR China.

Chemosphere
|December 31, 2015
PubMed
Summary

Sewage sludge decomposition gases and sulfur-nitrogen compounds effectively inhibit dioxin (PCDD/F) formation at high temperatures. These inhibitors, including thiourea, show over 90% suppression efficiency, offering a novel approach to controlling toxic emissions.

Keywords:
Combined S–N inhibitorsInhibitionPCDD/FsSimulated municipal solid wasteTG-FTIR analysisThiourea

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Area of Science:

  • Environmental Chemistry
  • Combustion Science

Background:

  • Dioxin (PCDD/F) formation is a significant concern in waste incineration.
  • Conventional de novo synthesis tests are typically conducted at lower temperatures (250-400 °C).
  • Sulfur-nitrogen compounds show promise in suppressing dioxin formation.

Purpose of the Study:

  • To investigate the inhibition of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) formation at high temperatures (650 °C and 850 °C).
  • To evaluate the effectiveness of sewage sludge decomposition gases (SDG) and sulfur-amine/ammonium compounds as dioxin inhibitors.
  • To explore the mechanisms by which these inhibitors function.

Main Methods:

  • Laboratory-scale tests simulating municipal solid waste incineration.
  • Use of model fly ash and specific inhibitors: SDG, thiourea, amidosulphonic acid, and ammonium thiosulphate.
  • Analysis of PCDD/F formation and characterization using techniques like thermogravimetry-fourier transform infrared spectroscopy (TG-FTIR).

Main Results:

  • SDG suppressed 2,3,7,8-substituted PCDD/Fs by 90% at 650 °C.
  • Thiourea, aminosulphonic acid, and ammonium thiosulphate achieved over 85% suppression efficiency at 850 °C.
  • Inhibitors exhibited distinct suppression pathways, with thiourea reducing the average chlorination level.

Conclusions:

  • Combined sulfur-nitrogen inhibitors are highly effective in suppressing dioxin formation even at elevated temperatures.
  • Gaseous decomposition products like SO2, SO3, NH3, and nitriles likely act as primary dioxin suppressants.
  • These findings offer potential for advanced emission control technologies in waste management.