Fe3 +-saturated montmorillonite effectively deactivates bacteria in wastewater
| dc.contributor.author | Qin, Chao | en |
| dc.contributor.author | Chen, Chaoqi | en |
| dc.contributor.author | Shang, Chao | en |
| dc.contributor.author | Xia, Kang | en |
| dc.contributor.department | School of Plant and Environmental Sciences | en |
| dc.date.accessioned | 2018-01-16T14:13:25Z | en |
| dc.date.available | 2018-01-16T14:13:25Z | en |
| dc.date.issued | 2018 | en |
| dc.description.abstract | Existing water disinfection practices often produce harmful disinfection byproducts. The antibacterial activity of Fe3 +-saturated montmorillonite was investigated mechanistically using municipal wastewater effluents. Bacterial deactivation efficiency (bacteria viability loss) was 92 ± 0.64% when a secondary wastewater effluent was mixed with Fe3 +-saturated montmorillonite for 30 min, and further enhanced to 97 ± 0.61% after 4 h. This deactivation efficiency was similar to that when the same effluent was UV-disinfected before it exited a wastewater treatment plant. Comparing to the secondary wastewater effluent, the bacteria deactivation efficiency was lower when the primary wastewater effluent was exposed to the same dose of Fe3 +-saturated montmorillonite, reaching 29 ± 18% at 30 min and 76 ± 1.7% at 4 h. Higher than 90% bacterial deactivation efficiency was achieved when the ratio between wastewater bacteria population and weight of Fe3 +-saturated montmorillonite was at < 2 × 103 CFU/mg. Furthermore, 99.6–99.9% of total coliforms, E. coli, and enterococci in a secondary wastewater effluent was deactivated when the water was exposed to Fe3 +-saturated montmorillonite for 1 h. Bacterial colony count results coupled with the live/dead fluorescent staining assay observation suggested that Fe3 +-saturated montmorillonite deactivated bacteria in wastewater through two possible stages: electrostatic sorption of bacterial cells to the surfaces of Fe3 +-saturated montmorillonite, followed by bacterial deactivation due to mineral surface-catalyzed bacterial cell membrane disruption by the surface sorbed Fe3 +. Freeze-drying the recycled Fe3 +-saturated montmorillonite after each usage resulted in 82 ± 0.51% bacterial deactivation efficiency even after its fourth consecutive use. This study demonstrated the promising potential of Fe3 +-saturated montmorillonite to be used in applications from small scale point-of-use drinking water treatment devices to large scale drinking and wastewater treatment facilities. | en |
| dc.description.notes | false (Extension publication?) | en |
| dc.description.version | Published version | en |
| dc.format.extent | 88 - 95 page(s) | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.doi | https://doi.org/10.1016/j.scitotenv.2017.11.302 | en |
| dc.identifier.issn | 0048-9697 | en |
| dc.identifier.uri | http://hdl.handle.net/10919/81796 | en |
| dc.language.iso | en | en |
| dc.publisher | Elsevier | en |
| dc.rights | In Copyright | en |
| dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
| dc.title | Fe3 +-saturated montmorillonite effectively deactivates bacteria in wastewater | en |
| dc.title.serial | Science of the Total Environment | en |
| dc.type | Article - Refereed | en |
| dc.type.dcmitype | Text | en |
| dcterms.dateAccepted | 2017-11-27 | en |
| pubs.organisational-group | /Virginia Tech | en |
| pubs.organisational-group | /Virginia Tech/Agriculture & Life Sciences | en |
| pubs.organisational-group | /Virginia Tech/Agriculture & Life Sciences/Crop & Soil Environmental Science | en |
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