Date of Award

Fall 2018

Project Type

Thesis

Program or Major

Civil Engineering

Degree Name

Master of Science

First Advisor

James P Malley

Second Advisor

Bram Martijn

Third Advisor

Joop Kruithof

Abstract

This research investigated the ability of ozone to degrade through oxidation a selection of organic micropollutants in untreated and ion exchange pretreated secondary wastewater effluent. Initially, a six-month sampling program was completed to characterize the variability in the water quality of the Wervershoof wastewater treatment plant’s secondary effluent used in this research. Bench scale experiments were completed to determine the ozone uptake and demand in demineralized water, tap water, IX treated secondary wastewater, and secondary wastewater effluent. Using data from the bench scale experiments, low, medium and high ozone dosages were identified based upon ozone residual for secondary wastewater and IX treated wastewater. Secondary wastewater and IX pretreated wastewater matrices were spiked with six organic micropollutants (OMPs), caffeine, carbamazepine, diclofenac, ibuprofen, iopromide, and TCPP. Analysis of the initial and final concentrations of the spiked micropollutants allowed for determination of the effect of each ozone dosage on the percent removal of the six chosen organic micropollutants. Ozonation resulted in the near complete removal of carbamazepine, caffeine, diclofenac and substantial reduction in ibuprofen, iopromide and TCPP. Bromate formation that occurred during ozonation exceeded drinking water standards, this formation increased with the applied ozone dosage. The greatest reduction in the spiked OMPs and the lowest formation of bromate occurred with the ion exchange pretreated secondary wastewater matrix.

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