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  4. An in situ MBfR system to treat nitrate-contaminated surface water
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An in situ MBfR system to treat nitrate-contaminated surface water

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Description

Nitrate, a widespread contaminant in surface water, can cause eutrophication and toxicity to aquatic organisms. To augment the nitrate-removal capacity of constructed wetlands, I applied the H2-based Membrane Biofilm Reactor (MBfR) in a novel configuration called the in situ MBfR (isMBfR). The goal of my thesis is to evaluate and model the nitrate removal performance for a bench-scale isMBfR system.

I operated the bench-scale isMBfR system in 7 different conditions to evaluate its nitrate-removal performance. When I supplied H2 with the isMBfR (stages 1 - 6), I observed at least 70% nitrate removal, and almost all of the denitrification occurred in the "MBfR zone." When I stopped the H2 supply in stage 7, the nitrate-removal percentage immediately dropped from 92% (stage 6) to 11% (stage 7). Denitrification raised the pH of the bulk liquid to ~ 9.0 for the first 6 stages, but the high pH did not impair the performance of the denitrifiers. Microbial community analyses indicated that DB were the dominant bacteria in the "MBfR zone," while photosynthetic Cyanobacteria were dominant in the "photo-zone".

I derived stoichiometric relationships among COD, alkalinity, H2, Dissolved Oxygen (DO), and nitrate to model the nitrate removal capacity of the "MBfR zone." The stoichiometric relationships corresponded well to the nitrate-removal capacity for all stages expect stage 3, which was limited by the abundance of Denitrifying Bacteria (DB) so that the H2 supply capacity could not be completely used.

Finally, I analyzed two case studies for the real-world application of the isMBfR to constructed wetlands. Based on the characteristics for the wetlands and the stoichiometric relationships, I designed a feasible operation condition (membrane area and H2 pressure) for each wetland. In both cases, the amount of isMBfR surface area was modest, from 0.022 to 1.2 m2/m3 of wetland volume.

Date Created
2014
Contributors
  • Li, Yizhou (Author)
  • Rittmann, Bruce (Thesis advisor)
  • Vivoni, Enrique (Committee member)
  • Krajmalnik-Brown, Rosa (Committee member)
  • Arizona State University (Publisher)
Topical Subject
  • Environmental engineering
  • In situ bioremediation
  • Water--Purification--Nitrogen removal.
  • Water--Purification--Membrane filtration.
  • Constructed wetlands--Environmental aspects.
  • Constructed Wetlands
Resource Type
Text
Genre
Masters Thesis
Academic theses
Extent
ix, 74 p. : ill. (some col.)
Language
eng
Copyright Statement
In Copyright
Reuse Permissions
All Rights Reserved
Primary Member of
ASU Electronic Theses and Dissertations
Peer-reviewed
No
Open Access
No
Handle
https://hdl.handle.net/2286/R.I.26845
Statement of Responsibility
by Yizhou Li
Description Source
Viewed on June 11, 2015
Level of coding
full
Note
Partial requirement for: M.S., Arizona State University, 2014
Note type
thesis
Includes bibliographical references (p. 70-74)
Note type
bibliography
Field of study: Civil and environmental engineering
System Created
  • 2014-12-01 07:02:17
System Modified
  • 2021-08-30 01:32:11
  •     
  • 1 year 6 months ago
Additional Formats
  • OAI Dublin Core
  • MODS XML

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