Results show that with the
temperature increasing from 150℃ to 300℃, the oxygen containing
functional groups and the atomic ratio of H/C and O/C of solid products
decreased significantly The carbon content and calorific value also
improved greatly. In addition, equilibrium moisture content and water reabsorption
rate gradually reduced from 12% and 10% to 7% and 6.8%
respectively. The relative content of O-alkyl, carbonyl, and carboxyl
carbon of the solid products decreased with the increase in temperature,
but aliphatic carbon initially decreased and then increased. Ca2+ and
SO42- content in the waste liquid products were the highest of the
cations and anions, respectively. GC-MS results show that a large amount
of organic matter, such as heterocycles, amines, ketone, and alkanes,
were dissolved in the waste liquid products. Moreover, the content of
heterocyclic organic matter increased and that of amines slightly
decreased with the addition increase of sludge