Comparatively with sewage sludge, TGA results on the combustion
of sludge from the treatment of industrial effluents are
scarce in the literature. In the specific case of the pulp and paper
industry, a few recent works [19e22] dealing with paper mill
sludge (mixed primary and secondary sludge) have shown that
combustion and co-combustion with coal may be feasible waste to
energy management options for such wastes. In this context, Yanfen
et al. [21] studied the combustion of different paper sludge
ratios (10, 20 and 50%) with coal and found that blends with a low
weight percentage of paper sludge (10 wt.%) resulted in combustion
profiles similar to that of coal. This is coincident with
findings on the co-combustion of sewage sludge with coal [16,17],
which recommended the utilization of relative low percentages
(10 wt.%) of such wastes in view of their co-combustion with coal
in existing infrastructures.
Primary and secondary sludge from the pulp and paper industry
have different properties, are produced in different proportion and
are not equally amenable for the different treatment options [23].
However, to our best knowledge, the separate combustion of primary
and secondary pulp mill sludge or their co-combustion with
other fuels has never been studied. Thus, in this manuscript, TGA
and differential scanning calorimetry (DSC) were used to determine
the combustion behaviour of primary pulp mill sludge, secondary
pulp mill sludge and their blends with coal. The main aim was to
evaluate the effect that adding a low percentage (10 wt.%) of primary
or secondary pulp mill sludge has on the combustion of coal
and its kinetics
Comparatively with sewage sludge, TGA results on the combustionof sludge from the treatment of industrial effluents arescarce in the literature. In the specific case of the pulp and paperindustry, a few recent works [19e22] dealing with paper millsludge (mixed primary and secondary sludge) have shown thatcombustion and co-combustion with coal may be feasible waste toenergy management options for such wastes. In this context, Yanfenet al. [21] studied the combustion of different paper sludgeratios (10, 20 and 50%) with coal and found that blends with a lowweight percentage of paper sludge (10 wt.%) resulted in combustionprofiles similar to that of coal. This is coincident withfindings on the co-combustion of sewage sludge with coal [16,17],which recommended the utilization of relative low percentages(10 wt.%) of such wastes in view of their co-combustion with coalin existing infrastructures.Primary and secondary sludge from the pulp and paper industryhave different properties, are produced in different proportion andare not equally amenable for the different treatment options [23].However, to our best knowledge, the separate combustion of primaryand secondary pulp mill sludge or their co-combustion withother fuels has never been studied. Thus, in this manuscript, TGAand differential scanning calorimetry (DSC) were used to determinethe combustion behaviour of primary pulp mill sludge, secondarypulp mill sludge and their blends with coal. The main aim was to
evaluate the effect that adding a low percentage (10 wt.%) of primary
or secondary pulp mill sludge has on the combustion of coal
and its kinetics
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