Levantamento de parâmetros cinéticos de unidade laboratorial tipo UASB tratando efluentes líquidos do processamento via úmida do fruto do cafeeiro

Abstract

This present work aimed at determining and to analyze the kinetic parameters of an Upflow Anaerobic Sludge Blanket Reactor (UASB), treating liquid effluent originated from the wet process treating coffee seeds in a lab-scale reactor. The entire treatment system was composed of an acidification tank, an UASB reactor and aerated facultative pound. The hydraulic retention times (HRT) adopted for the UASB reactor were: 76, 60, 41, 31 and 20 hours. The operational average temperature of the UASB was 23.4 ºC ± 1.6ºC. The parameters as COD, total solids and total volatile solids, temperature and TVS profiles along the bed reactor were monitored frequently for each biological organic loading rate (BOLR) and consequently HRT applied during all the experimental period. The results presented a growth rate Y=0.50mgDQO mgSVT-1 d-1, decay coefficient Kd=0.058d-1, maximum growth rate µmáx= 0.62 d-1 and the limiting substrate concentration Ks =2,000 mgDQO L-1. The values of Y e Kd showed to be correct according to the “t” statistical test, while the values of µmax. and Ks did not presented any association evidence to the same type of test.