Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 3, Pages 1819-1826Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00016
Keywords
Sewage sludge; HZSM-5; Catalytic pyrolysis; Acid pretreatment; Hydrocarbon; Nitrogen
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Funding
- NSF EPSCoR Grant [EPS-1101284]
- China Scholarship Council
- EPSCoR
- Office Of The Director [GRANTS:13905722] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [1101284] Funding Source: National Science Foundation
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Sewage sludge is the major byproduct generated in wastewater treatment plants and a potential resource for biofuel production. This study investigated the catalytic pyrolysis (CP) of sewage sludge with HZSM-5 (CBV2314) in a microfurnace pyrolyzer for the production of hydrocarbons and ammonia. Pyrolysis temperature had a significant role in the production and selectivity of aromatic hydrocarbons, olefins, and alkanes. Acid pretreatments including infusion and washing were employed to alleviate the catalytic effects of ash content in sewage sludge and improve the hydrocarbon production of CP. Both acid-infusion and acid-washing enhanced hydrocarbon production but acid-infusion yielded higher hydrocarbon production than acid-washing. At 650 degrees C the optimal acid infusion loading was 1 mmol.g(-1) sewage sludge and hydrocarbon yields reached to 51.4%. CP of acid-pretreated sewage sludge enhanced the denitrogenation of volatiles by releasing nitrogen as ammonia which could be recycled as fertilizer. These findings demonstrated that CP with acid pretreatment is a promising approach to converting sewage sludge into valuable fuels and chemicals.
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