Influência do oxigênio no crescimento de arquéias metanogênicas e bactérias redutoras de sulfato em reatores anaeróbios em batelada / Oxygen influence on methanogenic archaea and sulfate reducing bacterias growth in anaerobic batch reactors

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

This work aimed to evaluate the behavior of methanogenic archaea and sulfate reducing bacteria in the presence of oxygen, using anaerobic batch reactors under sulfidogenic and mesophilic conditions. The reactors were inoculated with anaerobic sludge from UASB reactor treating poultry wastes. Third copies of the reactors were fed with ZINDER medium, increased with sodium acetate, ethanol or sodium lactate and sodium sulfate, in order to get COD/sulfate ratio of 1,1-1,5. The headspace of the reactors was filled with N IND.2(100%) and increased with oxygen (OD concentration of 3-3.5 mg/L). The anaerobic control reactors were fed with the same organics substrates, however, the headspace was filled with N IND.2/CO IND.2(70/30%). The rates of methane production were 0.30 mmol/L.h, 0.41 mmol/L.h and 0.16 mmol/L.h, in acetate, ethanol and lactate controls reactors, respectively. In oxygen reactors, the rates of methane production were 0.27 mmol/L.h, 0.40 mmol/L.h and 0.08 mmol/L.h in acetate, ethanol and lactate reactors, respectively. The rates of sulfate reduction in acetate, ethanol and lactate reactors were 57% and 97%; 59.6% and 76.6%; 77.5% and 41.9%, respectively, in control reactors and oxygen reactors. In acetate and ethanol reactors, were verified predominance of Archaea domain in control reactors (59.2% and 58.8%) and oxygen reactors (60.7% and 54.5%), respectively. In lactate control reactor also was verified predominance of Archaea domain (56.2%), whereas in lactate oxygen reactors there was predominance of cells belonging to Bacteria domain (63.9%). BRS ratio in acetate, ethanol and lactate control reactors and oxygen reactors corresponded to 22% and 17.3%; 28% and 16.9%; 19.5% and 21.9%, respectively. The addition of oxygen didnt inhibit the methanogenesis and sulfate reduction in acetate reactors and in ethanol reactors.

ASSUNTO(S)

methanogenic archaeas sulfate reducing bacteria batch reactors and fish arquéias metanogênicas oxigênio reatores em batelada fish oxygen bactérias redutoras de sulfato

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