NDLI: A Kinetic Analysis of Microbial Sulfate Reduction in an Upflow Packed-Bed Anaerobic Bioreactor

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A Kinetic Analysis of Microbial Sulfate Reduction in an Upflow Packed-Bed Anaerobic Bioreactor

Content Provider	Springer Nature Link
Author	Bernardez, L. A. de Andrade Lima, L. R. P. Ramos, C. L. S. Almeida, P. F.
Copyright Year	2012
Abstract	The effects of initial sulfate concentration on anaerobic sulfate reduction and sulfide generation kinetics were investigated in an up-flow bioreactor, using a consortium of sulfate-reducing bacteria (SRB) from water produced from a Brazilian oil reservoir. Redox potential and sulfate concentration were measured to indicate the growth and activity of the SRB throughout the experimental runs. The results of the batch regime indicate that sulfate conversion and sulfide generation are both first-order processes for initial sulfate concentrations of 1,000 and 3,500 mg/L. The kinetic constants for the sulfate conversion indicate that the enhanced initial sulfate content was initially inhibiting, but that the sulfide generation reaction is almost independent of the initial sulfate concentration, likely due to the presence of at least two in-series processes that are faster than the microbial conversion of the sulfate.Die Auswirkungen unterschiedlicher Sulfatausgangskonzentrationen auf die anaerobe Sulfatreduktion und die Kenetik der Sulfidbildung wurden in einem aszendenten Bioreaktor untersucht. Dies geschah unter Verwendung sulfatredzierender Bakterien (SRB) aus Wasser einer brasilianischen Erdöllagerstätte. Um das Wachstum und die Aktivität der SRB während des Experiments festzustellen, wurden kontinuierlich Redoxpotential und Sulfatkonzentration gemessen. Aus dem Ergebnis des Batch-Tests ist ablesbar, dass beides, Sulfatumwandlung und Sulfidbildung, eine Funktion erster Ordnung der Ausgangssulfatkonzentration von 1000 und 3500 mg/L sind. Die kinetischen Konstanten für die Sulfatumwandlung zeigen, dass der erhöhte Sulfatausgangsgehalt zunächst verzögernd wirkte, die Reaktion der Sulfidbildung jedoch nahezu unabhängig von der anfänglichen Sulfatkonzentration ist. Dies ist wahrscheinlich auf zwei nacheinander ablaufende Reaktionsschritte zurückzuführen, die schneller ablaufen, als die mikrobielle Umwandlung des Sulfats.利用巴西油田(Reconcavo Basin油田)水中的硫酸盐还原菌(SRB)在厌氧型上流式填料床生物反应器中进行硫酸盐微生物还原反应试验,研究硫酸盐起始反应浓度对硫酸盐厌氧菌还原和硫化物生成的反应动力学作用。研究通过测定反应装置中的氧化还原电位和硫酸盐浓度指示硫酸盐还原菌(SRB)在试验过程中的增殖和活性变化。批次处理试验结果表明:当硫酸盐起始浓度为1000 ~ 5000 mg/L 时,硫酸盐还原和硫化物生成均呈一阶反应过程。硫酸盐还原反应的反应动力常数说明:即使在提高硫酸盐起始反应浓度的条件下,硫酸盐微生物还原反应之初仍受抑制;而硫化物生成反应几乎与硫酸盐起始反应浓度无关。这种现象可能是由于反应装置中存在至少两个远比硫酸盐微生物转化快得多的反应过程造成的。Los efectos de la concentración inicial de sulfato sobre las cinéticas de reducción anaeróbica de sulfato y la generación de sulfuro, fueron investigados en un biorreactor de flujo ascendente utilizando un consorcio de bacterias sulfato-reductoras (SRB) proveniente del agua de un reservorio de combustible en Brasil. El potencial redox y la concentración de sulfato fueron medidos para indicar el crecimiento y la actividad de las SRB durante los experimentos. Los resultados del régimen en batch indican que la conversión de sulfato y la generación de sulfuro son procesos de primer orden para la concentración de sulfatos entre 1000 y 3500 mg/L. Las constantes cinéticas para la conversión de sulfato indican que ésta fue inicialmente inhibida al incrementar la concentración inicial de sulfato; en cambio, la reacción de generación de sulfuro es casi independiente de la concentración inicial de sulfato, debido a la presencia de al menos 2 procesos en serie que son más rápidos que la conversión microbiana del sulfato.
Starting Page	62
Ending Page	68
Page Count	7
File Format	PDF
ISSN	10259112
Journal	Mine Water and the Environment
Volume Number	31
Issue Number	1
e-ISSN	16161068
Language	Spanish
Publisher	Springer-Verlag
Publisher Date	2012-02-12
Publisher Institution	International Mine Water Association (IMWA)
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acid mine drainage Brazil Desulfovibrio vulgaris Sulfate reducing bacteria Treatment Ecotoxicology Geology Energy Economics Sedimentology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Geotechnical Engineering and Engineering Geology

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