For this study, a bituminous coal (C) coming from the north
coalfield of Leon (Spain) and commonly exploited in thermal power
stations has been used. Primary and secondary pulp mill sludge
were provided by a mill that uses eucalyptus wood (Eucalyptus
globulus) for the production of pulp by the kraft ECD (elemental
chlorine free) process. At this mill, primary and secondary sludge
are generated at an average rate of 20 and 10 kg per ton of air dried
pulp produced, respectively. Primary sludge (L1) results from fibres
rejected after the cooking/digestion at the pulping step, losses of
fibres and other solids within liquid streams involved in the process
(for example, washing and bleaching). The composition of the L1 is
very similar to that of the pulp and basically consists of fibres.
Secondary sludge (L2) results from the biological treatment to
which wastewater is submitted after the primary clarification.
Essentially, secondary sludge is dehydrated biomass that results
from the action of microorganisms used to reduce, under aerobic
conditions, the wastewater organic matter content.
For this study, a bituminous coal (C) coming from the northcoalfield of Leon (Spain) and commonly exploited in thermal power stations has been used. Primary and secondary pulp mill sludgewere provided by a mill that uses eucalyptus wood (Eucalyptusglobulus) for the production of pulp by the kraft ECD (elementalchlorine free) process. At this mill, primary and secondary sludgeare generated at an average rate of 20 and 10 kg per ton of air driedpulp produced, respectively. Primary sludge (L1) results from fibresrejected after the cooking/digestion at the pulping step, losses offibres and other solids within liquid streams involved in the process(for example, washing and bleaching). The composition of the L1 isvery similar to that of the pulp and basically consists of fibres.Secondary sludge (L2) results from the biological treatment towhich wastewater is submitted after the primary clarification.Essentially, secondary sludge is dehydrated biomass that resultsfrom the action of microorganisms used to reduce, under aerobicconditions, the wastewater organic matter content.
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