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FONTANA, H. (2007). Wastewater post-treatment with submerged aerated biofilter filled with granular coal: technical performance and economic viability study. Sao Carlos, 2007. 127p. M.S. Dissertation – Engineering School of Sao Carlos, University of Sao Paulo. This research refers to technical performance and economic viability of submerged aerated biofilter with bed granular anthracite coal, employed in the post-treatment of effluent from upflow anaerobic sludge bed reactor. The experimental biofilters used in this research, with 47 L reaction volume, were loaded for 200 days with hydraulic retention time of 5 and 7.5h. Technical feasibility regarding the removal of organic matter and ammonia nitrogen was confirmed. BF1 (HRT=5h) removal efficiencies of filtered COD, BOD and ammonia nitrogen were 62%, 46% and 89%, respectively, with average effluent concentration of 25±11 mgCODf/L, 36±29 mgBOD5/Le 4±9 mgNH3/L. Moreover, BF2 (HRT=7.5h), with higher performance, achieved removal efficiencies 68%, 95% and 89% of filtered COD, DBO and ammonia nitrogen respectively, with average effluent concentration of 21±12 mgCODf/L, 3±3 mgBOD5/L and 6±12mgNH3/L. Combined systems UASB+BF achieved average overall efficiencies above 87% to filtered COD. Concerning economic feasibility study, the coal bed represented, on average, 23% of the total deployment cost. Within a twentyyear-project horizon and 11% of annual interest rate, the estimated minimum revenues for post-treatment system with submerged aerated biofilter with bed coal were R$ 0,19; R$ 0,20; R$ 0,22 and R$ 0,24 Brazilian Real per cubic meter of wastewater treated for 200,000, 100,000, 50,000 and 25,000 inhabitants respectively, without evaluating treatment cost of sludge generated in this system.

Pós-tratamento de esgoto sanitário com biofiltro aerado submerso preenchido com carvão granular: desempenho técnico e estudo de viabilidade econômica