Chemosphere 117 (2014) 72–78
Contents lists available at ScienceDirect
Chemosphere journal homepage: www.elsevier.com/locate/chemosphere
Disinfection byproduct formation resulting from settled, filtered, and finished water treated by titanium dioxide photocatalysis Brooke K. Mayer a, Erin Daugherty b, Morteza Abbaszadegan b,⇑ a b
Marquette University, P.O. Box 1881, Milwaukee, WI 53201-1881, United States Arizona State University, P.O. Box 875306, Tempe, AZ 85287-5306, United States
h i g h l i g h t s
g r a p h i c a l a b s t r a c t
All AOP influents (settled, GAC
filtered, finished) yielded similar DBP trends. DBP precursor reduction (DOC, UV254, SUVA) did not necessarily decrease DBPs. Low energy photocatalysis exacerbated the production of TTHMs and HAA5s. High-energy photocatalysis decreased TTHM and HAA5 formation. Based on energy and DBPs, an ideal pretreatment for photocatalysis was not found.
a r t i c l e
i n f o
Article history: Received 8 January 2014 Received in revised form 20 May 2014 Accepted 22 May 2014 Available online 25 June 2014 Handling Editor: O. Hao Keywords: Disinfection byproduct Advanced oxidation Titanium dioxide photocatalysis Trihalomethane Haloacetic acid Organic matter characterization
a b s t r a c t This study evaluated strategies targeting disinfection byproduct (DBP) mitigation using TiO2 photocatalysis with varying influent water quality. A Purifics Photo-CAT Lab reactor was used to assess total trihalomethane (TTHM) and haloacetic acid (HAA) formation as a function of photocatalytic treatment using water from a conventional coagulation/flocculation/sedimentation process, granular activated carbon filtration, and a DBP hot spot in the water distribution system. Regardless of influent water quality, photocatalysis reduced DBP precursors; however, low-energy limited photocatalysis (
Contents lists available at ScienceDirect
Chemosphere journal homepage: www.elsevier.com/locate/chemosphere
Disinfection byproduct formation resulting from settled, filtered, and finished water treated by titanium dioxide photocatalysis Brooke K. Mayer a, Erin Daugherty b, Morteza Abbaszadegan b,⇑ a b
Marquette University, P.O. Box 1881, Milwaukee, WI 53201-1881, United States Arizona State University, P.O. Box 875306, Tempe, AZ 85287-5306, United States
h i g h l i g h t s
g r a p h i c a l a b s t r a c t
All AOP influents (settled, GAC
filtered, finished) yielded similar DBP trends. DBP precursor reduction (DOC, UV254, SUVA) did not necessarily decrease DBPs. Low energy photocatalysis exacerbated the production of TTHMs and HAA5s. High-energy photocatalysis decreased TTHM and HAA5 formation. Based on energy and DBPs, an ideal pretreatment for photocatalysis was not found.
a r t i c l e
i n f o
Article history: Received 8 January 2014 Received in revised form 20 May 2014 Accepted 22 May 2014 Available online 25 June 2014 Handling Editor: O. Hao Keywords: Disinfection byproduct Advanced oxidation Titanium dioxide photocatalysis Trihalomethane Haloacetic acid Organic matter characterization
a b s t r a c t This study evaluated strategies targeting disinfection byproduct (DBP) mitigation using TiO2 photocatalysis with varying influent water quality. A Purifics Photo-CAT Lab reactor was used to assess total trihalomethane (TTHM) and haloacetic acid (HAA) formation as a function of photocatalytic treatment using water from a conventional coagulation/flocculation/sedimentation process, granular activated carbon filtration, and a DBP hot spot in the water distribution system. Regardless of influent water quality, photocatalysis reduced DBP precursors; however, low-energy limited photocatalysis (
