Publication Date

2019-02-25

Availability

Embargoed

Embargo Period

2021-02-24

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PHD)

Department

Civil, Architectural and Environmental Engineering (Engineering)

Date of Defense

2019-01-25

First Committee Member

James Englehardt

Second Committee Member

Sung Hee Joo

Third Committee Member

Elliot Atlas

Fourth Committee Member

Carl Hoff

Abstract

In remote areas with limited access to clean water, disease outbreaks can have a much larger impact than in areas where clean water is available. Portable net-zero greywater (NZGW) systems may be a solution, allowing users to wash hands or shower between patients in areas where fresh water is not typically available, unlike conventional greywater reuse systems. Based on the reviewed literature, an ozone-UV NZGW system was designed, constructed, and operated at the University of Miami. Results of the system are assessed, with water quality goals of meeting WateReuse Research Foundation guidelines for direct potable reuse and federal drinking water standards. In terms of organics and pathogens, the system met goals (total organic carbon (TOC) < 0.5 mg/L, >12 log pathogen inactivation), while bromate and nitrate exceeded water quality standards. An overview is presented of the chemistry in the ozone-UV process, along with formulation of a semi-empirical kinetic model of the ozone-UV process, such that other ozone-UV systems can predict organic oxidation in their process along with relevant process products. The developed model was fit to experimental data from the NZGW system. Second order rate constants for reaction of hydroxyl radical with TOC were on the order of 107 M-1s-1, and energy per m3 of treated water per order of magnitude TOC reduction was calculated at ~4 kWh/m3/order. Testing and analysis of this NZGW system provides a foundation for human contact greywater reuse systems.

Keywords

Net-zero; advanced oxidation; potable water reuse; ozone; UV; disinfection

Available for download on Wednesday, February 24, 2021

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