Abstract
In this paper, the solid residue and liquid residue were obtained via the hydrothermal processing of sewage sludge. The effect of reaction temperature (180–260 °C), retention time (30–90 min), and cosolvent (ethanol volume proportion) (0%–100%) on the polycyclic aromatic hydrocarbons (PAHs) distribution and formation were investigated. The results showed that the concentration of total polycyclic aromatic hydrocarbons (TPAHs) in the solid phase slightly decreased as the temperature increased, while, in the liquid phase, the TPAHs concentration increased; the TPAH concentration decreased from 3.862 μg/g to 2.808 μg/g in solid residue, and, in liquid residue, it increased from 2.755 μg/mL to 2.974 μg/mL and then decreased to 1.961 μg/mL. There was no tremendous influence by retention time, since the TPAHs concentration in solid residue decreased from 3.020 μg/g to 2.808 μg/g, and, in liquid residue, slightly increased from 1.80 μg/mL to 1.961 μg/mL. The concentrations of TPAHs showed the minimum level at 26...
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