Avaliação da redução de sulfato e produção de sulfeto dissolvido em reator anaeróbio de manta de lodo (UASB) tratando esgoto sanitário em escala real
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Data
2007-06-28
Autores
Subtil, Eduardo Lucas
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Universidade Federal do Espírito Santo
Resumo
In anaerobic reactors projected for the wastewater treatment the sulfate can be reduced to sulfide by the Sulfate Reducing Bacteria (SBR) through a process denominated dissimilatory reduction of the ion SO4 2-. In general, the sulfate reduction in anaerobic wastewater treatment has been considered unwanted, since the production of sulfide causes a multitude of problems, such as toxicity, corrosion, odour, increase of the liquid effluent COD as well as reduced quality and amount of biogas. In the present work was evaluated the sulfate reduction and it relationship with the dissolved sulfide generation (S2-, HS- , H2S) in an Upflow Anaerobic Sludge Blanket reactor (UASB) treating wastewater in real scale. The reactor operated with an average value of flow rate and Organic Loading Rate (OLR) of 86,4 m3 .d-1 and 0,73 Kg COD/m3 .d The influent average values of Chemical Oxygen Demand (COD) total and filter, sulfate, sulfide and MPN of SBR were 235,52 mg O2/L, 168 mg O2/L, 151 mg SO4 2-/L, 1,43 mg S2-/L e 1,2 x 105 MPN SRB/mL. The removal efficiencies of Total COD and Filter COD were 53 % and 49 % respectively. During whole experiment sulfate reduction was verified in the reactor, with an average reduction of 24 %. However, the dissolved sulfide concentration in the reactor was not higher than 4,96 mg S2-/L, do not representing risk to the methanogenesis. The average value of SBR in the reactor UASB was 7,6x105 MPN/mL and the COD consumed by those bacteria represented 13% of the removed Total COD. The kinetic model of first order was shown good fit to describe the global velocities of sulfate consumption and sulfite production, with K1 values of the -0,064 h-1 and 0,276 h-1 respectively. Correlation coefficients for data of the sulfate and sulfide were over 92% and data reproduction is good. The maximum rate to sulfate reduction and sulfide production were 9,67 mg SO4 2-/L.h-1 e 1,03 mg S2-/L.h-1
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Palavras-chave
Anaerobic reactors , Sulfate reducing bacteria , Sulfate reduction , Sulfide production , Produção de sulfeto , Reatores anaeróbios , Bactérias redutoras de sulfato , Redução de sulfato , Produção de sulfeto
Citação
SUBTIL, Eduardo Lucas. Avaliação da redução de sulfato e produção de sulfeto dissolvido em reator anaeróbio de manta de lodo (UASB) tratando esgoto sanitário em escala real. 2007. 100 f. Dissertação (Mestrado em Engenharia Ambiental) - Universidade Federal do Espírito Santo, Centro Tecnológico, Vitória, 2007.