Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for id:"oai:digitalscholarship.unlv.edu:thesesdissertations-4211". One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Nevada – Las Vegas

1. Amoueyan, Erfaneh. Static and Dynamic Quantitative Microbial Risk Assessment of Potable Reuse Paradigms.

Degree: PhD, Civil and Environmental Engineering and Construction, 2018, University of Nevada – Las Vegas

In recent years, potable reuse applications have become more common due to population growth and increased water demand, especially in communities with limited or variable water resources. However, there are concerns about potential exposure to pathogens and chemical compounds in treated wastewater. Therefore, advanced wastewater treatment processes are of paramount importance in any potable reuse system. The overall aim of this study was to develop and implement static and dynamic QMRAs to compare public health risk in various potable reuse scenarios. Cryptosporidium, norovirus, adenovirus, and Salmonella were chosen as the target pathogens. The research evaluated the performance of full advanced treatment (FAT) trains consisting of reverse osmosis (RO) and advanced oxidation processes (AOPs), which are required in California for planned IPR systems that directly inject recycled water into local aquifers or discharge to surface water. The study also explored ozone-biological filtration as an alternative for FAT trains by comparing its public health risk to that of the RO-based treatment train. Treatment process performance and resultant public health risks were modeled using the STELLA 10.1 system dynamics software package. The system dynamics model accounted for the possibility of unit process failure and subsequent effects on downstream treatment process performance (i.e., ‘domino effects’). The model also compared typical vs. outbreak scenarios and identified the components and operational conditions that were most critical to minimizing public health risks in each of the potable reuse paradigms. The dynamic disease transmission model incorporated secondary transmission and immunity through implementing different epidemiological states. In this study, dynamic disease transmission model was focused on norovirus which is the most common cause of acute gastroenteritis diseases in the US. This study indicated that combined annual risk of infection was lower in DPR systems with direct distribution (median risk= 5.4×10-8 and 1.2×10-6 for ozone-based DPR and RO-based DPR, respectively) compared to the IPR systems and DPR with blending. Generally, potable reuse treatment trains with surface water utilization resulted in similar risk of infection which exceeded the benchmark risk of 10-4. The model also identified 120 days and 150 days of storage time at 10°C and 20°C of temperature as the most critical parameters in de facto reuse systems when targeting Cryptosporidium and adenovirus, respectively. Included secondary transmission and immunity resulted in up to 8 orders of magnitude higher risk of norovirus than the static framework (depending on the treatment train). However, results of this study indicated that potable reuse systems were sufficiently robust to handle the high concentration of norovirus during outbreak conditions and that disease incidence of norovirus was mainly attributed to secondary transmission pathway. However, these results may change if other pathogens are considered in dynamic disease… Advisors/Committee Members: Daniel Gerrity, Sajjad Ahmad, Haroon Stephen, Krystyna Stave, Kaushik Ghosh.

Subjects/Keywords: Environmental Engineering; Water Resource Management

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Amoueyan, E. (2018). Static and Dynamic Quantitative Microbial Risk Assessment of Potable Reuse Paradigms. (Doctoral Dissertation). University of Nevada – Las Vegas. Retrieved from https://digitalscholarship.unlv.edu/thesesdissertations/3208

Chicago Manual of Style (16th Edition):

Amoueyan, Erfaneh. “Static and Dynamic Quantitative Microbial Risk Assessment of Potable Reuse Paradigms.” 2018. Doctoral Dissertation, University of Nevada – Las Vegas. Accessed January 23, 2019. https://digitalscholarship.unlv.edu/thesesdissertations/3208.

MLA Handbook (7th Edition):

Amoueyan, Erfaneh. “Static and Dynamic Quantitative Microbial Risk Assessment of Potable Reuse Paradigms.” 2018. Web. 23 Jan 2019.

Vancouver:

Amoueyan E. Static and Dynamic Quantitative Microbial Risk Assessment of Potable Reuse Paradigms. [Internet] [Doctoral dissertation]. University of Nevada – Las Vegas; 2018. [cited 2019 Jan 23]. Available from: https://digitalscholarship.unlv.edu/thesesdissertations/3208.

Council of Science Editors:

Amoueyan E. Static and Dynamic Quantitative Microbial Risk Assessment of Potable Reuse Paradigms. [Doctoral Dissertation]. University of Nevada – Las Vegas; 2018. Available from: https://digitalscholarship.unlv.edu/thesesdissertations/3208

.