Impact of natural organic matter on bromate removal in the sulfite/UV-L advanced reduction process

Bahngmi Jung, Aya Safan, Venkata Sai Vamsi Botlaguduru, Bill Batchelor, Ahmed Abdel-Wahab

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Advanced reduction processes (ARPs) are treatment processes that involve combining reducing reagents and activating tools to produce highly reactive reducing free radicals. The process has proven effective for treating oxidized contaminants, and the effects of process variables on the degradation kinetics of various target contaminants have been investigated in our previous studies. In natural environments, natural organic matter (NOM) is found in surface or ground water. NOM absorbs UV light and can react with photochemically produced radicals, thus affecting target contaminant photochemical reactions and further influencing the efficiency of ARP. This study examines the impact of humic acid (HA) and Suwanee River NOM on bromate reduction rates with UV irradiation using a low-pressure mercury UV lamp. The effects of the sulfite dose, solution pH, and light intensity are studied and the pseudo-first-order rate constants in the presence of HA (kobs,HA) are compared to those observed in the absence of HA (kobs). At low HA concentrations of 1 mg L-1, kobs,HA was larger than kobs however, kobs,HA was less than kobs at higher HA concentrations. Furthermore, kobs,HA did not increase with increasing sulfite doses in the presence of HA, which is unlike the behavior of kobs.

Original languageEnglish
Pages (from-to)461-471
Number of pages11
JournalWater Science and Technology: Water Supply
Volume17
Issue number2
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

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Keywords

  • Advanced reduction process
  • Bromate
  • Disinfection-byproducts
  • Humic acid
  • Sulfite radical
  • Ultraviolet light

ASJC Scopus subject areas

  • Water Science and Technology

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