A comparison of pilot-scale photocatalysis and enhanced coagulation for disinfection byproduct mitigation

Daniel Gerrity, Brooke Mayer, Hodon Ryu, John Crittenden, Morteza Abbaszadegan

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

This study evaluated pilot-scale photocatalysis and enhanced coagulation for their ability to remove or destroy disinfection byproduct (DBP) precursors, trihalomethane (THM) formation potential (FP), and THMs in two Arizona surface waters. Limited photocatalysis (<5 kWh/m3) achieved reductions in most of the DBP precursor parameters (e.g., DOC, UV254, and bromide) but led to increased chlorine demand and THMFP. In contrast, enhanced coagulation achieved reductions in the DBP precursors and THMFP. Extended photocatalysis (<320 kWh/m3) decreased THMFP once the energy consumption exceeded 20 kWh/m3. The photocatalytic energy requirements for THM destruction were considerably lower (EEO = 20-60 kWh/m3) than when focusing on precursor destruction and THMFP. However, rechlorination increased the total THM (TTHM) concentration well beyond the raw value, thereby negating the energy benefits of this application. Enhanced coagulation achieved consistent 20-30% removals of preformed THMs. Outstanding issues need to be addressed before TiO2 photocatalysis is considered feasible for DBP mitigation; traditional strategies, including enhanced coagulation, may be more appropriate.

Original languageEnglish (US)
Pages (from-to)1597-1610
Number of pages14
JournalWater Research
Volume43
Issue number6
DOIs
StatePublished - Apr 2009

Fingerprint

Photocatalysis
Disinfection
Coagulation
coagulation
disinfection
Byproducts
mitigation
Surface waters
bromide
Chlorine
energy
chlorine
Energy utilization
surface water
comparison

Keywords

  • Advanced oxidation
  • Disinfection byproduct
  • Enhanced coagulation
  • Photocatalysis
  • Trihalomethane

ASJC Scopus subject areas

  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Ecological Modeling

Cite this

A comparison of pilot-scale photocatalysis and enhanced coagulation for disinfection byproduct mitigation. / Gerrity, Daniel; Mayer, Brooke; Ryu, Hodon; Crittenden, John; Abbaszadegan, Morteza.

In: Water Research, Vol. 43, No. 6, 04.2009, p. 1597-1610.

Research output: Contribution to journalArticle

Gerrity, Daniel ; Mayer, Brooke ; Ryu, Hodon ; Crittenden, John ; Abbaszadegan, Morteza. / A comparison of pilot-scale photocatalysis and enhanced coagulation for disinfection byproduct mitigation. In: Water Research. 2009 ; Vol. 43, No. 6. pp. 1597-1610.
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