Investigation on the removal of H2S from microwave pyrolysis of sewage sludge by an integrated two-stage system
In this study, an integrated two-stage system, including the in-situ catalytic microwave pyrolysis (ICMP) and subsequent catalytic wet oxidation (CWO) processes, was proposed to remove H 2 S released from microwave-induced pyrolysis of sewage sludge. The emission profile and H 2 S removal from the p...
Gespeichert in:
Veröffentlicht in: | Environmental science and pollution research international 2017-08, Vol.24 (24), p.19920-19926 |
---|---|
Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | In this study, an integrated two-stage system, including the in-situ catalytic microwave pyrolysis (ICMP) and subsequent catalytic wet oxidation (CWO) processes, was proposed to remove H
2
S released from microwave-induced pyrolysis of sewage sludge. The emission profile and H
2
S removal from the pyrolysis of raw sewage sludge (SS) and sewage sludge spiked with conditioner CaO (SS-CaO) were investigated. The results showed that CaO played a positive role on sulfur fixation during the pyrolysis process. It was found that SS-CaO (10 wt.%) contributed to about 35% of H
2
S removal at the first stage (ICMP process). Additionally, the CWO process was demonstrated to have promising potential for posttreatment of remaining H
2
S gas. At the Fe
3+
concentration of 30 g/L, the maximum H
2
S removal efficiency of 94.8% was obtained for a single Fe
3+
/Cu
2+
solution. Finally, at the pyrolysis temperature of 800 °C, 99.7% of H
2
S was eliminated by the integrated two-stage system meeting the discharge standard of China. Therefore, the integrated two-stage system of ICMP + CWO may provide a promising strategy to remove H
2
S dramatically for the biomass pyrolysis industry. |
---|---|
ISSN: | 0944-1344 1614-7499 |
DOI: | 10.1007/s11356-017-9637-6 |