Abstract
The temperature influence on bio-oil distribution of granular sewage sludge (GSS) pyrolysis from 500 °C to 800 °C in a horizontal tube reactor was investigated. The maximum yield of bio-oil was 43.6% of weight-lost percent during GSS pyrolysis. The bio-oil mainly contained polycyclic aromatic hydrocarbons (PAHs) and long chain nitriles. The nuclear magnetic resonance (NMR) results of bio-oil indicated that PAHs were formed during pyrolysis, which were in agreement with gas chromatography-mass spectrometer (GC–MS) results that PAHs in bio-oil were mainly made up of tricyclic and tetracyclic PAHs. The yield of PAHs strongly increased with temperature, reaching a maximun value at 700 °C. The present results might be valuable for assessing sewage sludge pyrolysis as thermal treatment method and also for studying the formation mechanism of PAHs during sewage sludge pyrolysis.
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