Influence of activated carbon drying temperature on
regeneration efficiency
The regeneration operations were conducted at different activated
carbon drying temperatures with a fixed regeneration time
(20 min), regeneration temperature (25 ◦C), and activated carbon
drying time (1 h). The regenerated activated carbon was then
exposed to the coking wastewater again, and the regeneration efficiencies
of activated carbon were compared (Fig. 7).
It can be seen in Fig. 7 that as the drying temperature increased
from 50 ◦C to 150 ◦C, the regenerating efficiency of activated carbon
changed from 23.56% to 78.04%. Continuing to increase the temperature,
however, did not induce further changes in regenerate
efficiency. These can be explained that increase temperature was
in favor of evaporation of the mixture of water with organic solvent
from the surface of activated carbon. When temperature increased
to 150 ◦C, the mixture of water with organic solvent on the surface
of activated carbon evaporated completely, and the regeneration
efficiency of activated carbon reached to a maximum. Continuing
to increase temperature after that, the regeneration efficiency of
activated carbon would no longer change.It was therefore determined that the optimum drying temperature
for activated carbon regeneration is 150 ◦C.