The effect of flow type and rotor speed were investigated in a round-bottom reactor with 5 l useful volume containing granular biomass and treating synthetic wastewater with organic load of 800 mgCOD.l-1. Five impellers have been used to this end, namely: turbine and paddle with six-vertical-flat blade, turbine and paddle with six-45°-inclined-flat-blade and helix, commonly used in biological processes. Utilization of a draft tube together with the helix and six-alternately-inclined-flat-blade impellers was also assessed as a means to improve mixing and consequently mass transfer in the reaction medium. Results showed that altering impeller type and variation in rotor speed did not exert significant effect on the stability and performance of the investigated systems. However, analysis of the first order kinetic model constants showed that alteration in rotor speed resulted in increase in the values of the constants, demonstrating that increase in rotor speed improves solid-liquid mass transfer in the reaction medium. Analysis of the kinetic constants also showed that axial flow in mechanically stirred reactors is preferable over radial flow when the vertical flat blade impeller is compared to the inclined flat blade impeller. The presence of the draft tube showed significant improvement in mass transfer, which could be seen by the increase in the values of the constants used in the fit of the first order kinetic model to the experimental values. The power consumed was less than 1.6.10-3 HP/m3 at rotor frequency below 200 rpm and the axial impellers consumed 75 % less power than the radial ones. VRVolume do reator (l). xxvi xxvii SUMÁRIO RESUMO IX ABSTRACT X LISTA DE FIGURAS XI LISTA DE TABELAS XXI LISTA DE ABREVIATURAS E SIGLAS XXIII LISTA DE SÍMBOLOS XXV SUMÁRIO XXVII 5 CONCLUSÕES E SUGESTÕES 123 5.1 Considerações gerais 123 5.2 Considerações sobre tubo de tiragem 124 5.3 Propostas para trabalhos futuros 125 xxix REFERÊNCIAS BIBLIOGRÁFICAS 126 APÊNDICES 130 APÊNDICE A. Dedução do modelo cinético 130 APÊNDICE B. Ensaio com impelidor tipo turbina de pás planas verticais -valores experimentais 134 APÊNDICE C. Ensaio com impelidor tipo turbina de pás planas inclinadas -valores experimentais 139 APÊNDICE D. Ensaio com impelidor tipo pá de pás planas verticais -valores experimentais 146 APÊNDICE E. Ensaio com impelidor tipo pá de pás planas inclinadas -valores experimentais 153 APÊNDICE F. Ensaio com impelidor tipo pá de pás planas inclinadas e tubo de tiragemvalores experimentais 160 APÊNDICE G. Ensaio com impelidor tipo hélice -valores experimentais 167 APÊNDICE H. Ensaio com impelidor tipo hélice e tubo de tiragem -valores experimentais. 174 APÊNDICE I. Ensaio de consumo de potência. 181 xxx
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