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ZIMMER, T. R. (2006). Effect of organic load and fill time on stability and efficiency of an ASBR containing granular biomass treating cheese wh ey. 160p. Master Thesis – Escola de Engenharia de São Carlos, Universidade de São Pa ulo, São Carlos, 2006. The effect of volumetric organic load (VOL) and fill t me on the stability and efficiency of an ASBR was assessed. The ASBR containing granular bio mass was operated in batch and fed-batch mode and treated diluted cheese whey. Assa s were performed at 30C with total medium volume of 5.0 liters and 8-h cycle l engths. In a first stage the reactor was operated batch-wise with fill time (T feed) of 10 min and agitation frequency of 150 rpm. At each cycle 2.0 liters of medium were fed a t influent concentration (C infl) of 1000, 2000, 4000 and 6000 mg/L, in terms of COD. Alkalinity supplemen tatio was gradually optimized from 100% to 25% of NaHCO 3/COD ratio. At these conditions the reactor attained stability at applied VOL of 4.8 g/L.d, alkal inity supplementation of 25% and organic matter removal efficiency of 96.0% and 98.4% in t erms of soluble and total COD, respectively. In a second stage due to operational probl ems devices were developed to assure biomass retention and hence make fed-ba tch operation feasible. The tested devices included hybrid ASBR, agitation system with tw o impellers: helix and inclined blade impeller (a) and helix and inclined turbine impe ller (b). The system chosen was the helix and inclined turbine. With this configur ation agitation frequency and biomass volume were reduced to 75 rpm and 1.0 L, respectiv ely. This way, it was possible to assess feed strategies (T feed) of 360, 180 and 10 minutes at constant applied VOL of 2.4 g/L.d, for Cinfl of 4000mg/L at Vfeed of 1.0 L and for Cinfl of 8000mg/L at Vfeed of 0.5 L. At Cinfl of 4000mg/L increase in T feed resulted in decrease in efficiency in terms of soluble COD, which amounted to 97.8, 96.7 and 94.5% fo r Tfeed of 10, 180 and 360 minutes, respectively. At C infl of 8000 mg/L the increase in T feed resulted in lower values for COD effluent.

Influência da carga orgânica e do tempo de enchimento sobre o desempenho do reator anaeróbio em batelada seqüencial com biomassa granulada tratando soro de queijo