In
this study, the effects of operating parameters on the behavior
of nutrients during hydrothermal carbonization (HTC) of poultry litter
(PL) were investigated. A number of HTC experiments were carried out
using PL at different treatment temperatures, residence times, and
initial pH. The standard measurement and testing protocol was adapted
to determine the phosphorus (P) species in the solid hydrochar (HC),
while the Ca, K, Mg, Na, Al, Zn, Mn, Fe, Cu, Cr, and Pb contents in
each fraction were quantified and related to the P fractions. The
results indicate that HTC can effectively reduce the solubility of
most of the measured elements. The treatment temperature and initial
pH can significantly influence the speciation of P and other nutrients,
while the residence time effects were apparent at low treatment temperature.
The majority of the measured nutrients remained in the HC when the
hydrochar was produced without additional acid. Addition of acids,
particularly H2SO4, provides a good approach
for nutrient recovery.
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