Jump to main content
Jump to site search

Issue 1, 2017
Previous Article Next Article

A mechanistic understanding of the degradation of trace organic contaminants by UV/hydrogen peroxide, UV/persulfate and UV/free chlorine for water reuse

Author affiliations

Abstract

Climate change and population growth pose increasing challenges to the availability of freshwater resources. Ultraviolet-based advanced oxidation processes (UV/AOPs) are promising water reuse technologies that increase drinking water supplies through wastewater reuse. This study examined the fundamental mechanisms of contaminant degradation and reactive species generation in three UV/AOPs, i.e., UV/hydrogen peroxide (H2O2), UV/persulfate (S2O82−) and UV/chlorine (HOCl), on the basis of combined experimental investigation and kinetic modeling on the degradation of six representative trace organic contaminants. The formation and distribution of reactive radicals including hydroxyl radical (HO˙), sulfate radical (SO4˙), and chlorine atom (Cl˙) were investigated. Results showed that the treatment efficiency of contaminants generally followed the order UV/S2O82− > UV/H2O2 > UV/HOCl under chemical conditions relevant to treatment train steps utilized in water reuse. The generation of HO˙ was important in UV/H2O2, whereas both SO4˙ and HO˙ were important in UV/S2O82− and CO3˙ predominated in UV/HOCl. Among the three UV/AOPs, the treatment efficiency of UV/S2O82− was most sensitive to pH, chloride, and inorganic carbon. The combined experimental and modeling approach provided guidance for the design and optimization of UV/AOP systems for water reuse under diverse chemical conditions.

Graphical abstract: A mechanistic understanding of the degradation of trace organic contaminants by UV/hydrogen peroxide, UV/persulfate and UV/free chlorine for water reuse

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Sep 2016, accepted on 14 Oct 2016 and first published on 18 Oct 2016


Article type: Paper
DOI: 10.1039/C6EW00242K
Citation: Environ. Sci.: Water Res. Technol., 2017,3, 128-138
  •   Request permissions

    A mechanistic understanding of the degradation of trace organic contaminants by UV/hydrogen peroxide, UV/persulfate and UV/free chlorine for water reuse

    W. Li, T. Jain, K. Ishida and H. Liu, Environ. Sci.: Water Res. Technol., 2017, 3, 128
    DOI: 10.1039/C6EW00242K

Search articles by author

Spotlight

Advertisements