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| Titel |
Influence of Sulfate on the Transport of Bacteria in Quartz Sand |
| VerfasserIn |
Xiufang Shen, Peng Han, Haiyan Yang, Hyunjung Kim, Meiping Tong |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073444
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| Zusammenfassung |
| The influence of sulfate on the transport of bacteria in packed quartz sand was examined at a
constant 25 mM ionic strength with the sulfate concentration progressively increased
from 0 to 20 mM at pH 6.0. Two representative cell types, Escherichia coli BL21
(Gram-negative) and Bacillus subtilis (Gram-positive), were used to determine the effect of
sulfate on cell transport behavior. For both examined cell types, the breakthrough
plateaus in the presence of sulfate in suspensions were higher and the corresponding
retained profiles were lower than those without sulfate ions, indicating that the
presence of sulfate in suspensions increased cell transport in packed quartz sand
regardless of the examined cell types (Gram-positive or Gram-negative). Moreover, the
enhancement of bacteria transport induced by the presence of sulfate was more pronounced
with increasing sulfate concentration from 5 to 20 mM. In contrast with the results
for EPS-present bacteria, the presence of sulfate in solutions did not change the
transport behavior for EPS-removed cells. The zeta potentials of EPS-present cells
with sulfate were found to be more negative relative to those without sulfate in
suspensions, whereas, the zeta potentials for EPS-removed cells in the presence of sulfate
were similar as those without sulfate. We proposed that sulfate could interact with
EPS on cell surfaces and thus negatively increased the zeta potentials of bacteria,
contributing to the increased transport in the presence of sulfate in suspensions. |
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