Escherichia coli removal in down-flow hanging sponge reactors: insights from laboratory reactor studies

Down-flow hanging sponge (DHS) reactors, employed in domestic wastewater treatment, have demonstrated efficacy in eliminating Escherichia coli and other potentially pathogenic bacteria. The aim of this study was to elucidate the mechanism of removal of E. coli by employing a cube-shaped polyurethane...

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Published inJournal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Vol. 59; no. 6; pp. 295 - 304
Main Authors Tomioka, Noriko, Tran P., Thao, Aoki, Masataka, Takemura, Yasuyuki, Syutsubo, Kazuaki
Format Journal Article
LanguageEnglish
Published England Taylor & Francis 11.05.2024
Taylor & Francis Ltd
Subjects
Bioreactors
Bioreactors - microbiology
Burkholderiales
Coliforms
DHS
Dietary restrictions
Domestic wastewater
E coli
Effectiveness
Escherichia coli
Nutrients
Nutritional status
Polyurethane
Polyurethane resins
public health
Reactors
T6SS
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Wastewater - microbiology
Wastewater treatment
Water Purification - instrumentation
Water Purification - methods
Burkholderiales
T6SS
DHS
E. coli
public health
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Summary:Down-flow hanging sponge (DHS) reactors, employed in domestic wastewater treatment, have demonstrated efficacy in eliminating Escherichia coli and other potentially pathogenic bacteria. The aim of this study was to elucidate the mechanism of removal of E. coli by employing a cube-shaped polyurethane sponge carrier within a compact hanging reactor. An E. coli removal experiment was conducted on this prepared sponge. Escherichia. coli level was found to decrease by more than 2 logs after passing through five nutrient-restricted DHS sponges. Conversely, a newly introduced sponge did not exhibit a comparable reduction in E. coli level. Furthermore, under conditions of optimal nutritional status, the reduction in E. coli level was limited to 0.5 logs, underscoring the crucial role of nutrient restriction in achieving effective elimination. Analysis of the sponge-associated bacterial community revealed the presence of a type VI secretion system (T6SS), a competitive mechanism observed in bacteria. This finding suggests that T6SS might play a pivotal role in contributing to the observed decline in E. coli level.
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ISSN:1093-4529
1532-4117
1532-4117
DOI:10.1080/10934529.2024.2384205