Obtaining high quality syngas from sewage sludge (SS) means transferring a low-grade SS into a highgrade fuel or raw materials for chemical products. In this study, Fe is added to SS in form of Fe2(SO4)3 to produce an effective and self-sufficient catalyst in order to obtain more syngas and minimize liquid products from SS pyrolysis. The Fe-embedded sewage sludge chars (SSCs) were used as catalysts for volatile reforming at 600 °C. It has been found that the gas yield increases from 15.9 to 35.8 wt% of the SS and that of liquids decreases from 31.9 to 10.2 wt% after volatile reforming with Fe-embedded SSC when Fe was added equal to 7 % in the dried SS. In addition, the content of nitrogen-containing compounds in the oily products decreased. After reforming with Fe-embedded SSC, the molar fractions of syngas combustible components, including H2, CH4 and CO, increase, and the higher heating value of the syngas increased to 17.0 MJ/Nm3 from the original 12.5 MJ/Nm3 obtained from SS pyrolysis at 550 °C. Moreover, the volatile reforming seems to reduce the level of some important syngas pollutants, like H2S, HCl and HCN, even though it was also observed an increase of the contents of SO2, NH3, NO2, HCNO and N2O.

Obtaining high quality syngas from sewage sludge (SS) means transferring a low-grade SS into a high-grade fuel or raw materials for chemical products. In this study, Fe is added to SS in form of Fe2(SO4)3 to produce an effective and self-sufficient catalyst in order to obtain more syngas and minimize liquid products from SS pyrolysis. The Fe-embedded sewage sludge chars (SSCs) were used as catalysts for volatile reforming at 600 °C. It has been found that the gas yield increases from 15.9 to 35.8 wt% of the SS and that of liquids decreases from 31.9 to 10.2 wt% after volatile reforming with Fe-embedded SSC when Fe was added equal to 7 % in the dried SS. In addition, the content of nitrogen-containing compounds in the oily products decreased. After reforming with Fe-embedded SSC, the molar fractions of syngas combustible components, including H2, CH4 and CO, increase, and the higher heating value of the syngas increased to 17.0 MJ/Nm3 from the original 12.5 MJ/Nm3 obtained from SS pyrolysis at 550 °C. Moreover, the volatile reforming seems to reduce the level of some important syngas pollutants, like H2S, HCl and HCN, even though it was also observed an increase of the contents of SO2, NH3, NO2, HCNO and N2O.

Reforming sewage sludge pyrolysis volatile with Fe-embedded char: Minimization of liquid product yield

ARENA, Umberto;
2018

Abstract

Obtaining high quality syngas from sewage sludge (SS) means transferring a low-grade SS into a high-grade fuel or raw materials for chemical products. In this study, Fe is added to SS in form of Fe2(SO4)3 to produce an effective and self-sufficient catalyst in order to obtain more syngas and minimize liquid products from SS pyrolysis. The Fe-embedded sewage sludge chars (SSCs) were used as catalysts for volatile reforming at 600 °C. It has been found that the gas yield increases from 15.9 to 35.8 wt% of the SS and that of liquids decreases from 31.9 to 10.2 wt% after volatile reforming with Fe-embedded SSC when Fe was added equal to 7 % in the dried SS. In addition, the content of nitrogen-containing compounds in the oily products decreased. After reforming with Fe-embedded SSC, the molar fractions of syngas combustible components, including H2, CH4 and CO, increase, and the higher heating value of the syngas increased to 17.0 MJ/Nm3 from the original 12.5 MJ/Nm3 obtained from SS pyrolysis at 550 °C. Moreover, the volatile reforming seems to reduce the level of some important syngas pollutants, like H2S, HCl and HCN, even though it was also observed an increase of the contents of SO2, NH3, NO2, HCNO and N2O.
2018
Obtaining high quality syngas from sewage sludge (SS) means transferring a low-grade SS into a highgrade fuel or raw materials for chemical products. In this study, Fe is added to SS in form of Fe2(SO4)3 to produce an effective and self-sufficient catalyst in order to obtain more syngas and minimize liquid products from SS pyrolysis. The Fe-embedded sewage sludge chars (SSCs) were used as catalysts for volatile reforming at 600 °C. It has been found that the gas yield increases from 15.9 to 35.8 wt% of the SS and that of liquids decreases from 31.9 to 10.2 wt% after volatile reforming with Fe-embedded SSC when Fe was added equal to 7 % in the dried SS. In addition, the content of nitrogen-containing compounds in the oily products decreased. After reforming with Fe-embedded SSC, the molar fractions of syngas combustible components, including H2, CH4 and CO, increase, and the higher heating value of the syngas increased to 17.0 MJ/Nm3 from the original 12.5 MJ/Nm3 obtained from SS pyrolysis at 550 °C. Moreover, the volatile reforming seems to reduce the level of some important syngas pollutants, like H2S, HCl and HCN, even though it was also observed an increase of the contents of SO2, NH3, NO2, HCNO and N2O.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11591/377556
Citazioni
  • ???jsp.display-item.citation.pmc??? 2
  • Scopus 51
  • ???jsp.display-item.citation.isi??? 46
social impact