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• Rev. Ambient. Água 7 (1) • Mar 2012 • https://doi.org/10.4136/ambi-agua.849   copy

Sulfate and dissolved sulfide variation under low COD/Sulfate ratio in Up-flow Anaerobic Sludge Blanket (UASB) treating domestic wastewater

Variação de sulfato e sulfeto dissolvido sob baixas relações DQO/Sulfato em um Reator Anaeróbio de Manta de Lodo e Fluxo Ascendente (UASB) tratando esgoto sanitário

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstracts

In this study, the dynamics of sulfate reduction and dissolved sulfide generation (S2-, HS-, H2Saq) in liquid phase was evaluated in an UASB reactor treating domestic wastewater with low COD/Sulfate content. The evaluation in the UASB reactor was performed at three sludge heights (0.25, 1.25, 2.25 taps) and effluent of the reactor. Sulfate reduction was verified in the reactor, with an average reduction of 24 % throughout the experiment period. However, the dissolved sulfide concentration in the reactor was not higher than 5.0 mg Sdiss/L. The kinetic model of first order showed good fit to describe the sulfate reduction under different COD/sulfate ratio, with K1app between 2.94x10-5 s-1 and 1.17x10-5 s-1 with correlation coefficients for data over 91%. The maximum rate to sulfate reduction was 18.0 mg SO4(2-)/L.h-1 and small variation in COD/sulfate ratio promotes a significant change both in sulfate and sulfide concentrations.

COD/sulfate; dissolved sulfide; kinetics; sulfate reduction; UASB reactors

Nesse estudo foi avaliado a dinâmica de redução de sulfato e da geração de sulfeto dissolvido (S², HS-, H2Saq) na fase líquida de um reator UASB tratando esgoto sanitário tipicamente doméstico com baixa relação DQO/sulfato. Para isso foram coletadas amostras do afluente e efluente, além de três alturas (0,25 m, 1,25 m e 2,25 m) ao longo do reator. Durante todo experimento foi observada redução de sulfato no reator UASB, com um valor médio de 24%. Entretanto, a concentração de sulfeto dissolvido no efluente do reator não foi maior que 5,0 mg Sdiss/L. O modelo cinético de primeira ordem apresentou um bom ajuste para descrever a redução de sulfato sob diferentes relações DQO/sulfato, com o valor de K1app entre 2.94x10-5 s-1 e 1.17x10-5 s-1 com coeficiente de correlação para os dados superior a 91%. A taxa máxima observada de redução de sulfato foi de 18.0 mg SO4(2-)/L.h-1 e pequenas variações na relação DQO/sulfato promoveu uma mudança significativa tanto na concentração de sulfato como na de sulfeto dissolvido.

DQO/sulfato; sulfeto dissolvido; cinética; redução de sulfato; reator UASB

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Publication Dates

  • Publication in this collection
    16 Sept 2014
  • Date of issue
    Mar 2012
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Instituto de Pesquisas Ambientais em Bacias Hidrográficas Instituto de Pesquisas Ambientais em Bacias Hidrográficas (IPABHi), Estrada Mun. Dr. José Luis Cembranelli, 5000, Taubaté, SP, Brasil, CEP 12081-010 - Taubaté - SP - Brazil
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