This study compared the disinfection by-products (DBPs) formed from wastewater disinfection using peracetic acid (PAA) versus sodium hypochlorite (NaClO). Gas chromatography and mass spectrometry analysis found that changing wastewater characteristics influenced DBP detection and reproducibility, resulting in no identified DBPs. The study also examined DBPs formed from oxidation of 17β-estradiol (E2), clofibric acid, and ketoprofen by PAA and NaClO. Both reduced E2 but formed different DBPs, while 26.5% of clofibric acid was reduced but no DBPs were detected for either. Neither reduced nor formed DBPs for ketoprofen oxidation
1. Miaoyi Yan
Title
Comparative Study of Wastewater Disinfection By-product Formation during
Wastewater Disinfection by Peracetic Acid versus Sodium Hypochlorite
Abstract
This study comparatively investigated disinfection by-products (DBPs) formed from
wastewater disinfection with peracetic acid (PAA) versus sodium hypochlorite (NaClO).
Gas chromatography and mass spectrometry (GC/MS) was used for DBPs analysis. It
was found that the changing characteristics of wastewater influenced the detection and
reproducibility of DBPs formed, resulting in no identification of any of the DBPs
detected.
DBPs formed from oxidation of the 17β-estradiol (E2), clofibric acid, and ketoprofen by
PAA and NaClO were also studied. Both PAA and NaClO reduced E2: 13.5% reduction
by PAA and two DBPs were detected: 2- or 4-CH3O-E2 and one unknown compound;
92.3% reduction by NaClO and three DBPs were detected: 2- or 4-chloro-E2, 2- or 4-
chloro-E1, and one unknown compound. 26.5% reduction of clofibric acid was found by
both PAA and NaClO oxidation, and no DBPs were detected. Neither reduction nor
DBPs were found by both PAA and NaClO oxidation of ketoprofen.
Degree
M.A.Sc.
Supervisor
Onita Basu
Date
June 2012