Abstract
Anaerobic filters have been applied to distillery waste treatment at volumetric organic loading from 8 to 13.9 Kg COD/m3/day with efficiencies of 91.9% to 70.0% (Brondeau 1984, Bories 1982). Here, the efect of higher volumetric organic loading and the use of effluent recirculation are studied. The laboratory reactor used consisted of a glass column of 1 m height and 95 mm diameter, filled with ceramic Raschig rings. The specific surface area was 118 m2/m 3 and the void volume of the reactor was estimated as 83%. The hydraulic detention time was fixed at four days, and the organic loading was changea by dilution of the raw waste. Five runs were done starting with diluted distillery waste (i:iO) and decreasing the dilution. The last run was done with the raw waste using effluent recirculation with i:i ratio. During the experiments, soluble COD and HOD, solids, acidity, pH and alkalinity were determined. Biogas production and composition were also measured. In Table i, the influent characteristics and the organic volumetric loading applied for each run are summarized.
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