Results and discussions
3.1. Influence of drying temperature on H2 release from sludge
The amount of H2S released from the municipal sludge varied
with drying temperature and time (Fig. 1). At 100 ◦C,the amount
of H2S release increased with drying time, but the total amount of
releasedH2S during the experiment was relatively small. When the
drying temperature increased to 200 ◦C, the amount of releasedH2S
increased significantly. It initially increased, and then decreased
with time with a peak occurring between 60–90 mins of the drying.
Similar trend was observed in the case of 300 ◦C except that
the peak occurred much earlier (