Doctor of Philosophy (PHD)
Civil, Architectural and Environmental Engineering (Engineering)
Date of Defense
First Committee Member
Second Committee Member
Sung Hee Joo
Third Committee Member
Fourth Committee Member
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.
Net-zero; advanced oxidation; potable water reuse; ozone; UV; disinfection
Gassie, Lucien, "Design and Optimization of an Energy Efficient Low Environmental Impact Net-Zero Water Wash Station" (2019). Open Access Dissertations. 2240.
Available for download on Wednesday, February 24, 2021