Abstract
Mesophilic and thermophilic digestion of wastewater sludges from the forest industry were studied in semicontinuous flow reactors. Laboratory scale reactors were used for anaerobic treatment studies of a mixture of primary and secondary sludges from a CTMP mill. The VSS reductions in mesophilic and thermophilic digestion of combined CTMP sludge were 41 and 36%, respectively. Specific gas production in the mesophilic process was 0.09 m3/kgVSS added or 0.38 m3/kgVSSreduced. In thermophilic digestion the respective numbers were 0.05 and 0.13. The mesophilic digestion process was stable at an organic loading rate of 2.5 kgVSS/m3d, which represents a 15 days retention time. The supernatant quality of thermophilic digestion was poor (CODsol usually between 3000 and 4000 mg/l) compared with the supernatant of mesophilic digestion (CODsol 1000-2000 mg/l.
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