Full metadata
Title
Comparative transport of E. coli and Legionella in 2-dimensional porous media tank
Description
The study was to analyze the extent of bacterial transport in a two-dimensional tank under saturated conditions. The experiments were done in a 2-D tank packed with 3,700 in3 of fine grained, homogenous, chemically inert sand under saturated conditions. The tank used for transport was decontaminated by backwashing with 0.6% chlorine solution with subsequent backwashing with chlorine-neutral water (tap water and Na2S2O3) thus ensuring no residual chlorine in the tank. The transport of bacteria was measured using samples collected from ports at vertical distances of 5, 15 and 25 inches (12.7, 38.1 and 63.5 cm) from the surface of the sand on both sides for the 2-D tank. An influent concentration of 105 CFU/mL was set as a baseline for both microbes and the percolation rate was set at 11.37 inches/day using a peristaltic pump at the bottom outlet. At depths of 5, 15 and 25 inches, E. coli breakthroughs were recorded at 5, 17 and 28 hours for the ports on the right side and 7, 17 and 29 hours for the ports on the left sides, respectively. At respective distances Legionella breakthroughs were recorded at 8, 22 and 35 hours for the ports on the right side and 9, 24, 36 hours for the ports on the left side, respectively which is homologous to its pleomorphic nature. A tracer test was done and the visual breakthroughs were recorded at the same depths as the microbes. The breakthroughs for the dye at depths of 5, 15 and 25 inches, were recorded at 13.5, 41 and 67 hours for the ports on the right side and 15, 42.5 and 69 hours for the ports on the left side, respectively. However, these are based on visual estimates and the physical breakthrough could have happened at the respective heights before the reported times. This study provided a good basis for the premise that transport of bacterial cells and chemicals exists under recharge practices.
Date Created
2019
Contributors
- Mondal, Indrayudh (Author)
- Abbaszadegan, Morteza (Thesis advisor)
- Dahlen, Paul (Committee member)
- Delgado, Anca (Committee member)
- Arizona State University (Publisher)
Topical Subject
Resource Type
Extent
xiii, 96 pages : illustrations (some color)
Language
Copyright Statement
In Copyright
Primary Member of
Peer-reviewed
No
Open Access
No
Handle
https://hdl.handle.net/2286/R.I.54987
Statement of Responsibility
by Indrayudh Mondal
Description Source
Viewed on October 26, 2020
Level of coding
full
Note
Partial requirement for: M.S., Arizona State University, 2019
Note type
thesis
Includes bibliographical references (pages 80-87)
Note type
bibliography
Field of study: Civil, environmental and sustainable engineering
System Created
- 2019-11-06 03:42:13
System Modified
- 2021-08-26 09:47:01
- 2 years 8 months ago
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